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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="author" content="Dave Gurnell" />
<title>The Type Astronaut’s Guide to Shapeless</title>
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ClGyFQrqsGVKJEyCJmgCIAjiBjGY%2B8DcM3133XmU88mqmumjquvKrMrM9%2FcbFufoRnfXm%2B%2Fxf58zlf%2FQ556TGZFKpeTAgXJODCPtve%2BlAwv5pL%2FPRx45UU76e%2Fzs%2F%2FTzjx959HhpFt%2BrXMjLQrEoAEmkZbvyxtW70m63Z%2FY9S%2Fm8FHIF%2BfZvf%2BV0ksf2xo27taTPn9XNSsvEdbO1VbNmtWay3uvnZ%2FnmHNsx7oG66ZQ0W1bi32etVk%2F%2BodaYzZ7kTRlZKBRQEZBYNuu2FHM5qbdmf857e9VHkzy2Jpw3JmqJWZNmCACiRzGfV5M7AwGJFohqzUunZnsM2ZUagw%2BAQIwIM3ShQLhsrW2F%2Fj0y6RSuZUg0lYYtluP6fy7lZ2spbzWaPACAqAnEtqFCCX2YHKqb1dC%2FB%2BIQkk695d7%2Fcy6bnakVEddk%2FHEcl0FImkAEgP1R62Ehl2MgINFsNewdf5%2BlFdFpJTu3AQEMCESIHC0DAqMrG%2BFaEBGHkHTcttx3L%2FdQK2JqRjG3q7eWky0QXaxrSWaWnlgEIsAY1LbCE4hkLoMJNFr9LVzFGV2OWs0WDwEAgQgQH8hcBhNo2v0tXPlsfiZWxK17qzwEAARidHANMPubEDh8J0T3VDGP9RCSj%2BP2d5GpOMxns%2BEeeKmMWAkPhbENiEF027jREykQTY2PMCGTmdiXKcRhLucnqACYfJEs5MJvONVIeB1E14DDxqU0SDIFIkDcuX3%2BRuBfs1TIM7BgBJYz%2BHDXcje5TCa8A8%2B7hNVrFMoGQCDCbC0DthkWxGY92EK7ajnMhngoAsQJjUUMi9YM6pjOG9uizE1iz9gZe%2BkQiLNatK5jwOQ1Y2Nau7sW6NcrEXsIcJ8wS95Y9Ubix8%2BE%2BDwKZSdUILousQOAQNwpEKl9COZQyA23loeVrHLvvVuJH9%2B2AWcsIYgJFYg82eTSatlGvM%2FqVnAxTIVcltI2YBSjTPdCNpxL08a9tcSPr0UnlQQr46QLREOxbUziSWFtdSNAgYj1EMxilGz9dDoTeH9mTX6prK7zABKAqWVu3KTHIGI%2FTDYmtNtTVq7fC0Yghlz3DSBqFLKjHTv5bLCJW5l0WrbWNhI9tqbsv21C1ZIpEF1T6yAijRPF6s2V6Q9K3MtgIOXCaMIvH7Cb2d6ivA1ApAWiqbiGZF21LDPiENcCiGXCvQymUsgNP3qCdjOv3rjL%2FpsATM5gTn6ZGwxpkADW700fy4R7GUxlIT%2Fa3A%2FSzbz83u3Ej6tLNyuIs0A0uR2bCYvXlBiYaXsy%2Bwcf7mUwlIOl0QRiLiA3sykJKvRhhlgLRJMxoh%2BzQdna07Tcy2dxL4O5qIs5lxl%2B%2FGTSmUCKZme8vTfpCSqm7L8m92GetXt9LgLR1IQNE6ynJlmIV25PnqgSdIYmQNw4vDDaJSmI3sw1A%2BofmrL%2FksGccIFoajcVU4SxY0ih1rvXJgt61zpwGXovg%2BEcKuckPUJNxGx6%2BrVy%2B%2BL1xI%2BnKeE9DgIx2QLRVEzJvjKlkv%2Fdm5PFIeYyJKcAqDY8XB5uRcxOeZnS%2BofL15LfYs%2BU8wUPZMIFomtomropoRO2Y4ZAbFnWRHGI%2BRwCEUA5spgfakVMTxmHqKvNiPhDQ8J7XIcklUQLRFMxJfvKFFeHcvvq%2BKUzsmmW3ezXnkit6dx%2FWQ5uqkgcQJ7uO3moMPTzpolD3Ayo6xH7bhTWsbnrdh7CeC6mDGNjEF1TYhDNueFdv3hDPvH5p8c6EIk%2FnA1Ny5X1akuqLdcThHvnpFquDhYycqCUG7m7BwTPYjErB7zXVsPe51KVkZaMXwRaLY83zl5h3%2BUMhbgIRJPbzmmcSCaTbAuSujr0omdCmb%2B11Q1p1ZuSLxVGW3CIw9BR6%2BC9zea%2BgqN3UV2v2%2F5rIZ%2BR4wcLI3X4gOB5aKko1bvVgcaDSS9Vanlcfu9m8oVTmyoZSWcehrX5lLkx%2BBZgiji2LHPczFffvjz6jQyBGCrqPr6yXBsqDndTbXX%2Bu426zSDOAbWsnzpSGhiPmJkwk9larxixF5my35psXJrHe59PkorJhS5dejInjesXRi%2BhkUMghkbFE4XXVutT3bRvrzcQiXNCrbcnDg62xGcmiN29cfoS%2B22CsG1zLYhtUyyIJt8ETClFYFuOMc%2F0%2BtVbvpt5FDKUuAkFjTe8tdEM5GupSFRLJMyeQ6Ws727ux7jW93w2K7cvvMd%2BmySRZLAFcR6GtbkJRGMTVQx525ZllhXm9oXR4pwyafovh4HGHAa5p9zwRCLx8PMVibvdzekxg5rbtabUazUjxsyUyhHGlsibkzBGIM4Yx5AagepKN2kxX3z74tDPob1eOKhLWGMIg96fVistBneOIlFjErf3a86OaX2%2F8tq7xogmE8K2XBJUzBGI0sZUnPhbrUlxiCO4mdMpMmTDYKsWjvVkrWYxuHNEYxIfO172S%2BAo4xTLVvfyjbOXjRinpinWQ5M1g4sF0aCHbUqiilkH7LBs5jTu5cDRkjZBWw%2B371HEIs4XXTIPHy7KI96rkB3dgthcXjcms9eyzbiIm1ziZl4GNZJUmOjhbVwts%2BIQL5%2FeXyCSwRw8zZCD82stBGIU0GLaT5woy7HFggy7Z6ml8dKr7xozNqbssyZnMM9LM8xNIDoG91M05b1btmNUJMGdW8tSXdkcvNhosRc4DSvctdSy6fsaJY4dKMhjxxbkuPd7Ptt%2FPeU9gXj78jUjxkP3V91nzXivJlsQ5%2FNt0%2FN9z2ZaEU0Ktm02zQr0P%2F%2F6%2BYEfowdzHNcqqcxRolcwW%2BMS33%2B4JKeOluTYYt7vhNOzLN47e5X9NXHisG30WjTOgmjy5qvvu21MoopZcYiXT18Z%2FMEUMYgA07B7Ceml62ApJ%2B87VOxYFjOunHnxDWPGw5T91aX7GgLRNJFoAqbFIVaqNXmvT7IK%2BSnxJJfhwUWJYZUA3vz260a1%2BTQm%2FtA1NxZ4nlphvi5mg9PWTZnwGh9jWnHTM6%2Be2fNv9GAOh3I%2B3HHN53hukRLs%2B9QS1TJTNy7fNGYsdF81Jf7Q5JyFeZ6fc7YgkqhiAqbU6eoxLFkFgqMYskAMW4BCcJx%2F5axRIS0m7atGF8me4%2FfOzvehUwvRBFotW0qlglHP9%2FXn3pBP%2F%2FLPxXNuestyq2GLZbvSGFDmpZDLSDaT8suPzNMNq677pVJW1uvBu9q0i4cWa4Z4cG6fBLFECsSmGQLR9ASV9hy1QnbeD95cgdhJVEkZkLjQybRbMOr5Xj53VX6q0ZJsMd9ZaDFwMWvLOu1KMkrh6d7n3N1s%2BkLq8EJODpVzc4m1PFDKhSIQjx7Ix34eaqFv7UDRKwekvcAL2XTn9xiK30Hr6PzLZ%2Fz4X5Mwpv%2By4ZUE5ultzM79zXvqOGNo%2BQ997ybEpukB5diOZAzrRfzD59%2BWT3z%2B6VgIw5WtllgTbkT636lQXK605LAnEo8s5mcqFMuFTOBWRC2bov2A44Z2llmvqsi3pTmkRqR29tH3uVDM%2BmVj4pxIdeX0ZaP2FhWHprSeMzlBZd6lAOeuzFyH6ugmUK03jHu%2BZ984P7Q%2F8zxRAXFluSa31xsTi8PdN%2F0VTyRevFuVSmO22ZXHDxUDs4ipcHrfUjFWc00thddX6nLJG%2FvVamuoOOw9Lw0l0Oevz2zZuyTE0Vhz%2B%2FwNuX1r2ai9pWFQfVmTO6jM23o6f4Eo5mLSxG82LOOerwbMn37hh5H82dRq%2BN5qfSQhMcmmdmOtIfc2Z3eIqfXrpCcS1d09rTg8daQUm%2FI2en7oOF%2FznuU0PannKe6n5a0X3jJubzFpP3XbZDAbKxDbRrfcM8d0rtZSE63FUbQiqjhUq1HYt1O1ZN1Zn53lWC2Ijx0v%2B27TSf97FYdxic3zLcD3av44By3uZ%2FncpkGth3cMsx5quI4p3idN5mxTL9lcgei4Zvc6NancTcOwtntK1KyIPXE4KzQucJZiQy2J7z9akoeWRrcmqtXw6GJeTh0tx0ocqgXYCmn%2F0Oem4QdRP5uNtB4aVN7GdszWB%2FOudhKJ3dClYLYR1CMcjxcmakW0IuC2qzRmKw63iw2Nb5slmmDyxImyPHK46Cew7BZ%2BKh41MUOF5JMnFuTYgXxskjR64jBs64L%2FfVaimxl8%2B8JN46yHpu2jtmNugkoUtFEk0vT8Oj%2BGdprQOMRCzoz32uuqks6YlbWuVsQ3nntDPvOlT89xoxG5tTG%2Fg0Xj27TotGYczxKt06iv5BwYMhNxuF0kqgU4ikk73%2Fva98wTDAZ1T1FM9jBG4b2nozEQ5loQHcNuSCa6mZXXXnpTVu%2Bsz%2B37zyLmcOjP4AlUw0uaTc3NGYrDHmoBjlriiol1D5VawxzrIfGH83%2Fv6ahMBJMxKQ7RVDez8sLXX5zPodJ0%2FHIm80bj5VYrLYHJ0PjRaTKVp%2BFWhMS9Jn398KV3jJwD9ZpJ7mXD4w%2FbCETjBFLfhWBQHKK6RxzbzLiS82cuy6W3Z1%2FQN0qibK1mYUWckJWt%2BT1HtWZEZR5p0peJ1kOTspc7AtHw%2BMMInJORCQYzOdbAtEKgJhbN7vH9b78yW0HutOdmdRokNLZiVmcvCqj10JrzRToK4l7DNM6%2BecHIOWDavml6hRMsiLsODlPROEST%2BlKbWDS7x62bd%2BX177w5s%2B%2BnbdeixloVN3McxywK4v7b%2F%2FE5abXMnD%2BNujnv2%2FT4w6iI4%2BgIxLbhDbkNui3pe200zBUJL3zrZalXZxNLpD15I3dBsFzczGOgVuAwOt5MNJ%2FmKBBPv%2FyuXL1yw0xx2GgZdUZapruXHQTizgGxzZ4QtmHvv9k014qoFpBn%2F%2BhbM7h0SWSExW5qTdzMI49VhEIE5hWuoBeq57%2FxkrFzwLQLtWW4HsCCuOcwM9ukYFpAbr3RFJMf%2BSwSVhqt6M6phmV2fNFYF4oIjZW6medx6fjuV5%2BXSqVm5PPXfdKk8mAabuUa30ElGodjpCoWm5zNrBPCNJFcNzhZRXn2z54L1dXcjHDyk%2BmVC8Z6jla0hP6s69bqReqHb5wx9vmbtk%2FSPaUdmZyEaAlEw7OWTHMzV6tmC0S1iKhlJCkH%2BThoXB3EVLDO8OKhF6jvPvOi0eNt2j5pev3DdoR0UKQEoukFs02Lu9ALQatlGf3M1TIyj9qIAHG4eOgFamVl3dix1thD0wwnplsQ7Qhd7HExR%2Br9m1XuxrcQ1Cl5ErarGSCOmO5a7glEs85As8vbKFFK2E1HboKY7mY2MFnF9IBkdTV%2F7fe%2FjiKAWFDMhX9s6IVJL05GCwVvXzStd71lm13doC3RykVIR3FRmIyJ6f0mNaAfhNZ3C7qA9iwO8ol%2FtnwGpTUiuUwqUj9POhX%2Bz6MXJlOzlu9fHGt1496zTf3DaK31qA2Q6RZEE99%2FzfBklR5aQPvmpdsBCovoCsRMOsUDH5F8LlpiOmxx%2F71nXja2IHYPv7SNYeE3moPgGu5etiP2%2FqMnEI3PYGobd4tSk3q9jhVRC2h%2F80%2B%2BFVg8YiGXlnREhVgZC2Isx8qfUyFOKb0gfe%2B5Hxj%2FzLW0jWllz1oWxfOj1jAkkiYGh2xm495zpVIXED9jM8guKwsRFGIqWgsRdn9HDR2rqFiDF%2FLZ8ESRdzH68z8gFlcxsQSY6e7lqMUfRlYgmh6HaOJCoeTNA7TLirrZAjnQi9nIvb%2BDBayH43IgIs9xaSEX2tf%2BT%2F%2FuPxsfd%2BgL5XrTOCMJ7uVo6p5oWhBxMxspEitVrIg91M0WRH3EQ6Vs5NzMSwt5HnCEhNnIl418JrSEmW%2F84bfk1s27PGgx05uCezl68YfRFYgubbhMdDO3WjZWxG187Y%2BeDSRp5XA5F5n3pCID9%2FL4qDBbKs3XinhkMRxhr9n7ptc7fLAHWkaef6a7l33dE8EzP7I7telWRMu7UZlWNNu%2FPWNF3HZYBJO0ogd7VKyIYYkMEzh%2BqDi353hkIS%2FlEEID9AL07a8%2Fz8M1eP%2FDvRyt%2FsuxEIg2VkQjb1VYEXeiSStf%2BVd%2FPN0i9zTFyUOF%2BYvDkESGKczrOWqCzNEDwQt7FYd%2F%2Brtf5cHe3%2Fssf%2F8z7n3jXo6sQSyyAtG1MTlbho4BVsS9IvGrv%2Fu1qb7GYjE710QHdSuHITJMQ5%2FjkRnGcKrF8pHDxcBL26hVXK3jaiUHs%2Fc9C%2Fey32YXgTiOQGy3jasDtRvbE4gmjgFWxL1oZvO0IvGhpeJc4v9UZJw8VBRqYwfD8YP5mcQj6nM7daQU%2BJxRcahWcb34QG%2FPM9N6qF4y03svdwQiFsTEDNqsRSK3aeiJxGnK36hAO3W0PFORGJbIMJ33eWI%2FTEtimM9Ny9kgDtnvfGGMeznSOifiAhHTc8vQ5uVYEfuj5W%2Bm6dk8S5GIOAwXtST67t%2BATbOaaf7kiYVQnptawSlnsxOte2ii9VCTMmxCySKdb5HJHH38t6I8gfK5rNGTR8cgl81IKmWef07LPZRKBYGdXLnwnhRzBTn52EMT%2Ffc6lQ6Wcn5h1oYdzuak4kKFaD6LOAwTHd%2FDC%2FlAnqUmo5w4VJATBwsSxnaj4lCt4LCT9fWKkRUrNMae8jbeOLQsierTj7RA9H%2FAdHT7yc5MJOrmnTUv%2B1NN71nvfWezZL6GIRI14aHoCbmG5QYW66prVV2fDx8uemuXoMNZ0HuWh8o5SXm%2Fmt66Gedxqpg%2F7onCk0sFfz6EAeKwP2o9rDfMTNSpt1pGCuPt6L5rRdjNHnnznJpfMxmzrRAm37K2tmpSLJL92o9e%2FbhP%2FvzHJ%2F4aKiz0tVa1%2FJc1YTyMCkMtyO3XXEQXzgUtpq1uZ301PdG%2F1bD9S5bltPuIwozkPTFYDrE7CuJwyMW%2FbW4Per%2F2ITkGkSyOHSuB6A%2Bg6W5m17tl2LY3DOaNg7qZ9ZaNqzk8kagcXsj5r4onKqr6arlDxaKKQo1XW%2BiW0EEYRge1ChZy879YIQ4HU63Vje0a1iQ5pXO%2BRVwkR15xqAlaF5G6mk2mZTlGCkSlY0UMJy4qKSJxY21LPvOlT0%2F9tXoWRf%2BW3xZptDo33Kbteuuw7VuclFw2HbrlCeKLlrL52u9%2FXa5eucFg9EGtZ7Vqw8j37ienEHsobWlH%2FoIQC8WhKtt0gagZ3RqvkDZQJen71tv24kKJk2UAr730pmytb8rf%2FLt%2FPbCvqRbBXucTOqDAOOKQOodDLr2VurF1fql92B0HO%2FrW41ioLodUeJ%2BmwWVfNFaHmJX9CaKYNgDiMFy0fFe90TT2%2FTcpXxYbXRMLgUhXlW03L4PHYX2zwq4ygkj88v%2FzH%2FyDGmCWaG%2Flf%2FfPfw9xOAQNmTFWFHmXfBfrYWcsXCyIwYkjrIi%2BWd7k2A0tJtto0Lt1GHpAqxVHD2yAWXD65XflT3%2F3q%2FRWHkKt1vDr%2Fxm7h9skp3SEcjzmQOTrID5QR23JGZ7NrGh5gHwuZ%2Bz715pR5XKRhJUh1OsNOff2RVlcKMvxR44zIBAa2v7xua%2B%2FQOer4UeYrK9vian2M%2FUCcsHvnWNOLLyisRGIOpRZQzuK7N5kspmMscXD1cWuUyCfzwkMv6VeePeyiHdpf%2FSpRxgQCPYSUm3KM3%2FwDXnzlXcYjBHY3Kz65cpMRa2HDnHkPnGJw4yPBVHEF4emF83u3cRMbkGoruZSMe%2BJZObCKFy%2FclNuXrgpj3%2FkccnlscLD9Gj4wld%2F7y%2Fk%2BjXCGEbbsyzZqpgbe6gX%2B3qzJUL4oX9xt2MilGMlEHEzP1hsOg4mW1M1FpPi2aOzsb4lZ147Iyfff1IOHF5kQGBiNN7wa195ViqVKoMx2rEla2tbRicY6n6tblXQmsZ2bOZCrAQibuadY5EzuEexuirUzc6FYYyNqWXJD199F5czTIS6lL%2F9p9%2BRF7%2F9A%2BINx0BruDabZpd20bI%2BFCLpFMdWD1hciJcFUXAz9%2Bgkq5htRdSElZJ2WKHH21jgcoZx6bmUr16%2BzmCMc5G1HVnfMLs8l8ZdYj3soMWx4xSHGTuBiJt5m1j2hJEmrJh7G%2BtsPriax0ddzm%2B99EOynGEomqX8zJ8862fGw3ioa9n0un%2BNpmW0e32HWG7ZsRqL2AlEHVptu5fGatRJVsmabUXE1TzN2HWynJevL8upD57Cmgg7WL2zLv%2Fpd74q7759nsGYgEq1bnxZF92f6ZzS0y7xci8rqfyHPhc7aZ%2F1xEABQeBTKOS8sTC75Iv2pz529JCkCT2YmHw%2BL5%2F74qfloz%2F5EQYDfKvhqy%2B%2BSeHrSYWR7ci9lQ3jx6FabxKv2kWTUzQsCoEY9g%2FtCYIybsXOWKRTcqBcMn4cNGHnqCcSYTo%2B8Ngj8tlf%2Bowced8Sg2EgGmv4zT%2F5Fu3ypkA9iMvL67FopRaqSHZcTyASltCj7onluLUMjl8MYu8H94QRdfDE97mrizVj%2BFj4cT4U0J4ajU08%2FdpZcZoOmc4mHV7dDOX%2F%2BhffJdZwSrYq1di5EkOZU80WsYc9sexdFuLYYjGWFsSOsk1LsZBn5klHIC5iRfQ5fvSQZAwu%2FxMki4tl%2Bfwvfkae%2BNjjDEaCef07b8oL33oZd3IAaMyh6VnLnQu7K5UaF40eTcsW24rfpSG2AlEplwuSEpJVFO0skssSl6mW1GPHlujVHCAnHz4hX%2FjVX4id29ly2t7G7EjDeuDqy2W9i6X3KuTwPlx6%2B7J895kXcScHhBrL7t1bi50bMQzUemhZWFF71OrNWFpTYy0QtQ4g2asdsCI%2BQC3LS0t0CwmaD374cfn8%2F%2FyXpbQQ7fjfjbota9WWJw4Hx4DlMmk5WMrKkcW8mFYQQeMMv%2FPn35VbN%2B8yqQNkdW0T17IQe7h3PBy%2F1E8cibVA1OxVauA9ACviAw4eKEu5XGQggr6U5fPyYz%2FxEfkffuEvRU4o1pqO3N5oijVGIVq9WB3zROLhheTHrmrZmhe%2B%2FqKcP3OZiRwwWtKmUqkzEELm8m407CCuCUuxFoiKWovorPLgsMOK%2BADiEc0Rimo1vL0%2BudViqZSV44eKibQmIgzDRVtYrq5tMRCC9XA3Gm6g2ctxJfYCkZqIO6Eu4gOIR5yNUPzQR5%2BQT3326bnFKE4rDnscKGbl4cPJsTprjOHrL7wpV6%2FcYKKGJQA8QbS8skHcYResh7suDzGsfZgogags4Ep88EDVilgqGt1dZTvEI84OjVF8%2Bud%2BQh5%2B4qGZfU91K19bDc61d3QxL8cOxLs6gmYln3nzHDGGM2DFE4dxLF8SBlgP%2B%2BxPMU1OSZRA1Np3OVyJ98GKuJPFxZIsLuB6nxWa9fzhj39IPvnzHw%2F9e126Wxsr5nAUHjtWjl2Ws9YxfOO7b8rbr7wjlUqNSTgDNjaqUm80GYguWA93C%2Bb4JqckSiCSrLLroWJF3MPSoUUpFqmbOduLW7ju56Bcy7uJk6tZ3cjvvPou8YWzFuSeGNrYrDIQXSzb9sQydTS3E%2BfklEQJRIVklZ1o%2BZ8ShcR3XCKOHjlI0sqc6FkVP%2FypDweW1HJlubZvKZtpeOLEguQy0bxgadLJK99%2BVa5ceA9r4Rygz%2FJeKrV6p5sV%2BMQ9OSVxAjGbyfiuVXiAulXTWBHvQ9JKNNB%2Bz0985PGpxKIWwb50NzwLzkNLRTlUik7ym4rCs6%2Bfk3Nvn6ew9TwPfpJS9qCJGI0m1sPtxLVzSmIFokJnlV2iOZuRchHX%2B3Y0VvXo0UMMRMzFYtDJKbs5spCX4wfna4HXgtbn3rogV89fRRRGANWEq6skpewck7ZU6g1pYz3cQTUhbQYTJRDVrZqn5M0OFkpFXO%2B7KHmi%2BdChBQYiYhw9uiQf%2BOAH5NSTjwzt%2F7y81ZKVSnhWi4V8Rt5%2FdLaJTZpocvmdS3Lx9GW5df0O7uOIsb5ewVK2Cx2PFi31dqBlbZIyJolSU7Z3s0Mg7jp0Wi0%2FYQW2jUmjKZlsmszmiKFWMn299tKbfoLLyYePy9GHjo0kGOOIuo1vX70l1y%2FdlFvXbmMljDCasYw43Im62RGH%2FXVIUkiUBVEpFnKSyZCIsB1a8PXn0MEFst9jhCa6HD1xRI6fPCZHnnxUGpnwXMBBWxDVOnjLE4LvXbwhK7eXZWV5DQthTKjVGrK5xbPaDWVt9pKE0jbbSZxq0GbppRICcTuNluUn8VD2ZpdVYLPqjwnlb%2BKBFn72iz%2B%2F0b34lMty4tGH5Pipk3Lw2GEpLJYlHVCryfSEPfc0brBRrcudG%2Fdka31LVu6uemJw3duXsD7FEc1ERRz2E0Iu4rAPSYtPTZwFUdEDXzNW4QHqei9S9mavEKD8TSI5fOKYHDx8UA6fPO6341QBme3O%2F%2BJCUZzs%2FhUPMtWKpOt7k2A2Vjdlo9t3t9Vo%2BgJQQQQmD3osD4ayNn1Es%2Bv6tQ8RiBFHkzIQQ3tZLBcljXBGJALA%2Foe97ciKdxmgnM1empYlzQS5UYMbl2SUttlxNiZycTuutIWFvZs6i7ovegjoYeBQvgIAcYg43HevJDFlL6o37ASOS2LNSS2Lw36vcHb8lkjQf%2BNTdxJnAgDiEHHYH83kpubhXqyE6o3ECkRV81gR%2ByzwluUXN4U%2Bh4Pr%2BoVwGR4AxCHsOlMdJ1ElXAIdGxuBiKpPAHr7U5EIA%2BaMt9ARiQCG7Yveel%2FfqCAOB45PmzqQA3WGnVijS6IFIredwRNa4zQBkQiA%2BKGF3jCaLYus5X3Oi6SSTvbCb%2FtiCPZSbzYZBEQiAOIQcbgvruuSmLLPOZHkkK20CQ8Q%2Bi36tl%2BuABCJACaiMYf37q1xRgyhhmt5IHbChXPiBSJWxMFoLSu9HcL%2BInF5eZ0SOAAJE4ckpIxwRljeGUE4Uv855DiJnz9GVE0mFpHb4VQbgSeiqZMIgDg0CTUeUBB7MNrWN%2BkYIRB1I6Bv5ICx8W6HuJpHm0OIRADEIcYDMMF6aIxANEXtTwqu5vFEYtL6bQKYQL3eRByOeibgWkZPmCQQsSJyWwxqHmm9ND1sACA%2B4nBjs4o4HGWPw7W8L6ZYD40SiCap%2Fok2Be%2B2SCHU0dHDplKtMxAAEWdzq%2BqvVxiOJnViLEBHGCkQVfVT0mCfiU8B7bGoVOqyscHBAxDZi5y3Pms1rP2j4hfE5gwYiEnWQ%2BMEokLJm%2F3RAtr0ah5jvBpNWVmhViJAlND1qOtS1yeMKn4oiD0M07yQxglE6iLujxbQruNiGO%2FSQa1EgOgIne56xFs03rlYo7vW0H3etBjWtKkPGgajdSMtGxE91qHUrZVIhjPA%2FND155ejoirDWKhRoE2v5f11g4GGJSMFIlbEETbaFqVvxqWX4UzyCsDs0XWn649M5fFQtzLNJIaLQxNDr9LGPnAWxP4i2u1ksxGPOMFBVfEOqvUKcYkAM7nwi7%2FedN3BmJdal%2BoV6AUEYp9NpS1NrIj7bx5a%2BqZFPaxJ0E2XuESAcOnFGyJyJjsDayTxDKVlqPXQaIGo2PrgBTPPvjcnb4yIR5zw8OrGJVJUGyB4ep1RiDeccPw8Ue0Sd7i%2FiBazw9HSpk%2BAVhPxMwziESdH46G0SC8uZ4CADu2uS5nOKFOce8Qdog8QiMOxHYcb6LANmXjE6UU2LmeAqcGlHMCllbjD0eaaN0624e1500wDimePtKkQjxjIhnNvZYMsZ4AJ0HWj64cL%2FRSXfeIO0QUIxDEPbk%2F8OA6WnVEWDJX2AzjoKnVZXdukpRXAiJdTXS9kKU9PrUHc4WiawKHtLALxAaa10JkUdU2wcIKZb8srG1KrNRgMgEGCxlsfuk7Yn4PauzGEoAcQiOPfUimePfqm3WwSHB7QnNvcqmFNBNi9NrpWQ10f7DXTo5Uo8P6MOFbeODHnEIh9FpFD2ZsR8JNWGk2SVgK8rWJNBOheQLEaBiu2XeLHRz7btKwNiYQIxL6TwxM8lL0Z%2FYZfJxMuuPHEmgjsKVgNQzjTqnqZJ%2B5wtMt608bwgUAcDGVvxhgr76ZFuYSAN6iWLXeX18l0BqPQ%2Ba7zHqsh4nBeUNZmL1mGYC%2BWt0llinkGYhRBY3ljlUlLLstUCvTArNSlXmvKoUMLks%2FnGBBI6IXIko2NKpfyEPAbHOCNGH0uNnHD7wYL4oCbBHEIo1P3SyewEYUxD1fXtvyuEWz0kCR0Puu81vmNOAyepmWRdDkGJKb0B7PPPhMmm01LyvsFw1FXxkKxIOk0d47ALQHNlm9pKS8UZaFckhRTEmKKnsHVWl1q1QYHclhnl21LE2vY6HOSxBQE4vgbWSdhpVDAvTfSeHUzmxdKRU%2FAoGCCRg%2FTntt5cbEkpVKBQYFYUa83%2FTmMxTA8tEatenRgdEhMQSBOhAasZt2MZLCKjSZi3PZ9SyIiMaQDwDtcNzar3iHgCcWFEvGJEP0DuGX5SSgkoIS9%2F7p%2BjVoYbz8lMQWBOMXtwsJaM84m1S1%2FUy4yZuEeurastrY8gZiVpYOLks5wiYHo7QXrmxWE4SzGmozlic93QCBOtfA0HjGXY6hGRcvfqEgsFcgEn4VQ1PIgJU%2BQH1gsIRQhEsJwS8MhGlizZoG6R2uIw7EhMQWBGMwhrKVcshlJ4zYda%2FEpiMTZoIexvhCKgDA0Sxyq5ZAqB2POVc0xIMsbgRiYSGxaUqQ24tgiUeM381hfEYqAMITAqWmJMcThROc5IBADo1cbMZfNMBhjoCVa1PBKIe35CcXFhaJvAQcI9JBtWVKvtxCG81rj3t7qkGAxNmq4IJMegRjKxKI24iRipSVSRCTOUyhqMgtZzxDIpc9bz7V6g%2BSTOYtDCmGPDzUPEYjhTa522y9AWiSuDpEYM3pZz%2Bryp44ijL%2F3qTCkjiHiMN7o%2BU3NQwRiaGghUlzNiMTYzt9uHcWtrZrfmUXLERGnCIPQ%2BLZKrS6NeouMT8RhrNFz2yFeE4EY%2BkTD1YxIjPvB3%2B3Moi%2B1iGsCFklYcH%2Bd1juhCbiREYdJwHctM3YIxJlMNlzNiMQEoYlE%2BspspaVULmBVNPXSgLUQcZhQcC0jEGcKrmZEYuLmtOvetypqUotmQBf9tomMTXIvu2otbPgWQ4L3EYdJBNcyAnE%2BEw9XMyIxoahrUV8ar6hCsVDIJd4F%2FYX2lvzYzauyVa3KK4%2F%2FiLyWW0qsKNSEE7WqqOUYEIdJpdcJDSYjlf%2FQ57C7ToFmhRK7NR0lb%2FwQidFHOwkVCvlEisXfbNyRE7UtuX532a8tl0qn5Pb7H5WvH3gUUQiIw5iiJZnIukcgzhXtFEKvZkSiiWJRXdFxd0P%2Fn%2FXbcqRekXqrJXdX1na%2Bz4feJ79z9KlYvi%2BNKWy2LEQh4tBIdPxop4dAjIbAKRXo1YxINPeSpEJRrYv5XKy6tvzj6k3JN2v%2Bn5fXN6Rab%2BwVwzESidrdRMWg1bKJKUQcGotaDdV6CNPBaRwQTW8yUnx4yo1R%2B4oW2lLI0e0jbvRiFhW%2F%2F7YnFFU0qmCMaka0Wg574lCpNfu3jHNv35G%2FUSzJXyw8Er2D0BOBaiXsjL9F9nGM0SzbhvcMEYcB7Ef0WkYgRgndmJvewi7gap5OaHsL23XbUqKEUKxv770Wf1EVjP%2B7veq7lXtU6nVpu4PF1Yn3rsrTTy3Kq7lDCEIIRRxWvfXikm0bzBnCukAgRg1bs5rTKclkKH0zDb0bNCIxmYJRQzFUMGZzmW78bm6mMYw%2FmWrKE5urO%2F6tVm%2Fuf4B74vHpy2fk9Ac%2FJfXUbNa3igWNobIdxxeDFK1GHMKQvcZbK7peAIEYzduLt4mXSpS%2BCUIkqiWxXMx74oGxTBJ6u%2FeTJrZpMrUyaqJXTzRmvUtWGJbGsrTli6s3ZfcR0rCGxyupWPv7196R%2F%2F%2FUjwd%2FsNmO%2F%2FVVTKsYtC0HK4gJa8F73jUVhy7Pemqh7f1qcolCIEb9NthsWJS%2BCeg2qDfrBT9LFpGY6GftHZTOLtGoqFs6nUr7wtEXjenUVBbH32jcFae9Ux5q7GF7xAO6urUln7dW5Nnc0fHFgOP61g3b7og%2FFYKO7VKGw2BxqPtbG3EYCHru0i0FgRiLw06tAXniEaffRL1DVTNL%2FfZvadq%2FmcZ9t2ofD7B2MdJ6hZl0RjLZztzYvubUjb2dj3lf5HBta8%2FXGbcEzFNXLsmzHzy67VKoFm%2Bre%2Bi377u4OlZAFxEIe7Bs209IQRwGtE90re8QLJS5CREt%2B5Ghp20wE9UTAuVCgfGEyeZPSuRf5T1x6O7NbuwVxx7rQDpyXP5l%2BhgDCxOJwzolWAJD2%2BhR5zMcOG1DRLMNNS4Cpkdv2mpJ1M0VYFw%2BW2hL3t07dyzHGVscKsdrFQYVxkZrHCIOAzwX%2FLhDStqEBT7QMCcv8YjBb7DaOinn%2BtZZgFH5lUxKnrYXpJpypSKuNL3XZsqRTXv%2Fw0XjHnNp7%2BX9XsikZSldkKVUTrLtlPyjoiP%2Fb4OKBTDaWVDTvYsM20Ah7jBccDHPQoXnstRHDHpMsxm%2FDA7JKzCMH82n5T%2B4jb4fW2m2pGJPZoGwvTX9y%2BkDDDDsi5%2Bp7M0zytgELA61BBRFxUMFF%2FMM0EnMzTHgMbU7Gc4ugckwhC%2FlBt%2BBW%2B7k6zLrrevP0TwJ9kHj46hxGMa4OohDBGKCbjstm7pmQd%2FMu5svhVFhEEvplHxhgIXQaatAnO7g%2FjW7xiBD%2F8uHJ2A0bppM5YD3%2FTb1DhGICaMTj0hwcuDj6m2%2B2gWjaRGoDHv52UJKDg6w3ljt6a06x%2Busadi712syCpm14aDnKHGHCMRE3nzYNELaNJqW35GAjQO28z%2BmB4vApj295Vnn26%2BXcB%2FCgz1evRoW7s9Q0PMTT9zsIHNixjgORbTDwo9LdCmqDQ%2F4q%2FtcyOzuQWMfLMrqB07Kjfc%2Fdf9jB7dW5eSlS1K%2BuTb0e3zC1u9RZLBN338cx7cc4lIOB78YNrGcCMSko7fLjHaAyFAiI%2FAbvNu5wRfzOcllmd4m85MF75Kwj5Fw%2FaGD8p2f%2Bivyrx%2F%2Fhf6f8NMiv3LvDfnsq1%2BVE29fHvh1PqBu5iwC0WTUstXCahgampSCVRaBaAwaZFsspiVNmZbA0Ru81ku0tV5iPkcpHEP58Wx7oEB846c%2FKf%2FsY78qy4UF%2BcVjTXlyyZIj5QcHUMtJyZW1nLy98DH54%2BOfkL%2FzsRflr%2F75v5fs5t5yOW3v8PqRUkrOWliOjNtrqG8Y%2FqWfpJS5kckcffy3GIZ53YpcyeFqDm9jcV2xvVc2k0YkGshv5EUe7XNwqzj8B5%2F8%2B%2FLxoyn51acqcuqQJaXcTteVdnQ8Wnbko0db8kTJkT%2BRJ2XlyR%2BRHz%2F%2FA0k39x5Wa%2BWCvG0zx0xCXco1Sm2FTp2klLlBoNacb58NMpvDFYmeCK%2FUGrh%2FDORn%2BsQfnvmJD%2Fvi8DOHLfn8Y1XJZ4YfPI8tWfIbnpD83pGn5Jkv%2Fm99P%2BdjDln0JqEuZa2eQLxhyOOMOEQgmozj3T6biJfZbOhkORvDo9m91rzGwaL800%2F9Pfmpg7YvDsdB3c9%2F%2B1RVvvzIz8i1T310z8cfp8ySGRdOb7%2Bu1LlwzgI9Fx2sswhE09GK8Gw4Mxhn2%2FE3dwprJ5%2BTmb0C8fVPfFIuZsvymfdPVtxaLYmfXHDkv%2FzEl%2FZ8rGQxp5KOX%2FiarigzwaKNHgIRdi4IAp3Dp1dYWy2KWBOTi5%2BgsotnH%2FsZ33q4WJj8gH%2F6REP%2By6GnpPbw4Z3zirWb3D1Daxv29gxcyqGj5yAGEwQi7KLRtDCpz9IaUG9QV8sgvrr4mHxgcTpX8MMHOgfXrSee2POxfm5tiDfqbaj4%2BwQXgFnQaSZBuAYCEfqiHUGoFD%2BjzUhrJnqbP9bE5PGU7Hyet554yP%2F9WHm6C0EvqWXzwJE9H%2FvJLJeNpNApX9MkEWXW4pCkTQQi7L8xsUhmC9bE5HFw98WrFFwh6w8XsSYlmZ7V0LZ5zrOEHssIREAkRvP2ijUx0Sytrgf2tc40%2BndAOoyHOfb7LlbD%2BaDnHZ4zBCKMiMYiIhJnD9bEhArEW%2BvypF2T61vTFaavNDtb5rF7N%2FZ87GEXi1Oc1z1WwzmJQ%2B9STuw9AhEmEInUSJw9PWsidRPjy%2Fv7iLXPr7wjZzemE4iX13P%2B7yfPXdrzsXKbQy52a50M5bni1zrkMo5AhMnQWlCIxDmNfbduIiUX4sepPnUJ%2F%2FKZ%2F%2Ba7h29t5Sb6mtqf%2Bb8tF%2BUfXv5m357MEB%2F04te0LKlU62Qoz1EcUusQgQgBiEREypwOErftWxcquJ1jz2PvXJFfW3tH%2FvS9si%2F2xuXlGyW51UrJT7%2F4DIMZ5%2F3UE4TqIWhSTmVuWN7lG3GIQISgFhSFtOeKdk%2FQQ6VOEksseLGQ7%2Fvvf%2Be5P5RyrS5fObc4lkg8t5yXZ1by8k9f%2FR0p31xjgOO4hrvuZE1CcXEnzw2%2FEHYLcY5AhEDxC2kjEucu1HE7xxdNVvnn3%2FgX0qo05LfPHBzqbtaklD%2B%2FuCi%2Fd63su5Y%2F%2Bl%2BfH%2Fi5tRTbaRTBnRwtcUgh7PiQyRx9%2FLcYhvhgO65k0ilJpzmM5nfidNxUlm17zyLjPQvqm0SNv5EXeXSAGMisbMgnLz0v9RPvky83T8nN9Zyk3JS47bRUWhn%2FdWsrK6%2FfLcq%2F94Rh3hMW%2F%2Ff3f1uefuYb%2B37P50tledtmLkTqQuet0VqzRXYy4hAmIMsQxA9dZMWCqvsMgzFHetnO%2BhxKxbykU4iDeBxUbd9N%2FKu%2F%2B%2F%2FJpz79tLx76pPy5cbP7Pm8L2xckH9y7QfysRe%2BO1JSSgOvZYSesSv1VssPDYEI7JVqxW3hdUEgwsxEYqmURpRE5Gas7qtcLivFfE5SPJO5szni5z35%2FKvypLwqX5R%2FK%2BtPnpRWudNx5cTblxnEmAqReqOFKzliz6RBlxQEIsxYJHqLrojlKjJofKK6nvOeUMxnswjFOXJBxh%2F7pYu3pvqeFx2e9zxFSLNl%2BWsQEIeAQDSeXks%2BRGKEnonb9stnaBILQtEs3iC8ai57oApDksYQh4BABERirISiWjQK%2BZzksiy1WXIJa17i972W3akPSwcUxCEgEAGRGL%2BN0u3ERDXTFkJxhlT2OZdymbRIwNY%2BO8dzRRgC4hCBCIhEQChGmuo%2BZ1MY68Ol1BHCEBCHCERAJEIQQjFHjGJovNNyZ7q7bWpdUiqqhCI4tOuG5TgIQ8QhIBBhWpFYrzelWMhRJzHiQpFkluRwTy3CLcYhSLFBVjLiEOYL7TgSCm35YiLou0Kx0u3z7LLBBsbb%2BdndfysMdyA4fs%2Fzpl9XFHGIOIT5ggUx4SKRjivxEYqWa%2FuHYjabkUJOLcDc36Zha4a9kd9N5xjwKdCWeE1v7tP5JG6CnvZ5CERAJMLM0L6x%2Bkp7ArGQy5LQMiE3BhTLzoUgHOsYT8ZGLU8WiSeIQ0AgwnxFYj7X9pMiIEYHqPaTdVrS0IQWT%2BDn8zmSj8bgzoB%2Fz4QwhF9r8lxGFxaun5GMCxlxCAhEiAB6S1fnTQGRGDvUutJyO5YWdT9rUksWizDEaQ771kLHm8OWn6AF8cV%2Fji3EIQIREoXdvbEjEmP8DHvu53TKF4lYFQfzlj14XLKptNjtYOLdWgXiDwfOV8fxBQXWwmSgcaI2zxKBCMkViW3XlWIhz2DEGHebVVHjS%2FO5jC8YKZUz4sbnCWybJP9w5ma3dqGKQ6yFiENAIEKM0BigXkFtSMLzdKTeLWmU85NaMrigPa47nlDJpiRvhytSrqZcEcN10H0Xsk0mchLR88Jxea6mQR0NU0WFt9i1oDZ195KFuvJq3nPdqtU7dRUN3dQPeDvbP1hKyUah%2FxaXSwe39WU31%2BWUgVWy290s5FrDm2%2FVujR0viEOEYeAQIT40ytwikhM4OGtdRU9sVipNbxX9%2FA2aJP%2F24cy8nimLasDhGBGgnPF11xLfmX9ihyX5LvfdotCbRtp46tP7Pmgl03EIQIRTBUS3dZ8dF1J8Eav8YrbxKJaFu0EP%2B%2F%2FdSkjP5fvHGpbA2IyMwHWuml4Y5n3RNIvVq%2FLYgIbMvsxhRai0CRUFNIdBYhBhM4hR61EY8Si2%2B3YkkqnJJNO349ZTEKCy88tZOQLhQcibZAnORtgseyW2xFLx%2Bp1%2BaX0Dfn90qMJmCeuWN0MZNzGholDahwCAhH2HHTUSjQKdUPbrnPfGqSdW1QsalHudDp%2BzoUfK6bl1xd3ipnCoI0vIDG84e6MPXykWpFfzNyRP8u%2FL15zod32rcq2Jwb1dzqbmHsGUJIIEIjQF78MjndIkOFsHmopaupLrB3WRS2jE%2FVai0%2Fk0%2FJ%2FHNwrauxMyALR2Zuc8pHNVVk5XJTnM4ciPWZazUDjCW3XxUoI0mxaiQ49AQQiBHFwdDOcC55IpAizmeyxLqpgzKgrOh05wagZy7%2B5JLLQ90ca%2FHNmUmlxpiyWrQkq%2Ffj02k1pHknLD9IHIiUIO8%2FUJeYYHqx171ezYZGMAghEGI1ehnMhn%2FMEAblMxs%2BH%2B7GLcl8wqhtaYxfV0jjPOfJ%2FeULsRGqwS3RQLcSc9x6m1Un2Pq7Yn928JXeWCvKe5OeyfjWO0O%2B8g4UQhuzzJKMAAhHGu1nq5tFs%2Bb1%2FSV6BvYLR2ZHNmvHFYsoXiyoaZxHH%2BOuHtZzN%2FuKnGWKx7P3a9Wlms5a%2F%2BTdLT0klxIIRbV8Mdiy%2BaiVUYUgHExgGySiAQISp8ZNXvAOnQM9ZGHLg%2BBa5bWdOTzSqWAza0vhLBx%2BUs5kXdWf%2FgH4Vif9L9T35w4VTgYhEX%2Fx5gtDxrYOuJw4RgzA%2BtM0DBCIEhp%2FZ2GhL3hOJxCXC2KJxG%2BqeTqXSks2mxftT19qYGqvMjpaz%2BVJpNHFY8b7PgTnWJ9TyN389e1u%2BUnh4jHFz%2FdgwFYK%2BVVCthLiJIQDojAIIRAj%2BsO8WTyUuEaahY%2FFy%2BiZKZLo9pFU8%2Br%2BnM9tE5QMB%2BfHCaN%2BrnkvJ2YW83F7aa%2F3ebGXEcicPQqzalqytluXw3drQz31ia0MWCw%2FdtyKqJVDDvnRNqRDsuOy9V9ulxAyEs%2B6INwQEIoRJLy5RYxLzxCVC0JeQrmjs%2Fd6UnTFSPevjDzZz8qmjmaFf704hK3%2F3y38Q2s%2F7tz7zs%2FLXZLhAPF86ILfr9CqG%2BaAFz1st4g0BgQiz2HD8uERXigXqJcLs6Fkfv7%2Flym8eLQ%2F9%2FPc1bflHX%2FxlKRdT8gs%2FusvsWNQdsI9buzpc8F1aScl%2FfKspf8m9O9LPfdX7ZohDmAfEGwICEWaOxkZpM3dNXsmkcTnD7Nhw2vJmoy0fL%2B4ft1iy2vJntxr%2B5%2F%2FWr9dHE6F3lod%2Bzss3TsqLG658UFJybISv%2Ba6vRgFmeJnSHtpN6hvC5HCqw1S0u3EttGeCWfNabfjBd6HV9sWh8v2L5cC%2B95nljjC9lioN%2Fdw7%2BYLcarPVwiwv7w7JKIBAhGigpXA0NhFgVrxaGR5T9W7jQUD%2B8%2BcygX3vC2udGMkrqeEhFm9nDvKwYGY0%2Fb3YIhkFEIgQpVtrx%2BXsEGsFM%2BCG5fgWwv04U3%2BQpXzuTjDt5dZqeXlnvWMxv%2BRmpZnZX3jiXoZZ0MtSJt4QEIgQSXpZzi02KZgB363sfxl5p%2F7Aynj%2BXjBZnK%2FcWNzx9yu5wW7mjVwO9zKEjmYp1%2FVyjksZEIgQ%2BQ1L3RzebdbFzQEhcqY2WPRtjz9UTq8GEwLx0rWd2dD7xSGeyy7ykCBU%2FAs5JWwAgQhxoldY27IdBgNC4VzTkdsD%2Bixvjz%2Fs8cxbC1N%2Fz%2FMrO%2F%2B%2BXxzim6kyDwnC2V8J6QEEIsQZdTnr7ZYEFgiLH9T6C8TXK3vDHL53Yfo2kefXd154BsUhqntZPwYQNL2kQBJRAIEI3HYBBvD8Zv%2FLx%2Bv1vW638%2Femi429sLwoV6t7LeL94hBxL0Pg%2B6jr%2BrGGlBUDBCIkil4CS7NJvAwERz8385uN9gCBN93ce%2BNW%2F3jDfnGI70mBhwOBQVw3IBAh8diOgzURAuWdxs6%2FnxkgEN%2Br2LJSyU38fd69199lvDsOUV3Or7YRiDA9vfI1VIYABCIYAdZECJLXqjsPz7O1wYfpsz%2BcXLi9fqu%2F8Nwdh3g2j3sZpkethpSvAQQiGAnWRAiCFyst2V4SsV%2F8YY%2FTNyf%2FPmfWBwvP7XGI56XEQ4GJ6VWAwGoICEQwGqyJEATf72YzD4o%2FvC8er082z165tiTr1uCvvT0O8ZzkeSAwEa1urCFWQ0AgAnTpWROpmwiTcLbbVu%2FMEIF4bmWykktv3dnfNd1rqXe2uChb7RQPBMaCDGVAIALsw%2Fa6iWTrwTi8XO0Iv%2F3iD5X1livnbo8fh%2Fju8v49l7WlntY%2BvJBe4GHAWKj3hAxlQCACjHKbdrhNw3hoW72Xau194w97PHdmfBfwxZXhLr%2Br2bK8RfYyjIh6S9Rrot4TgKhBmX%2BINBqPY3ubaD6fk0yG%2Bwzsz7%2B%2BWx%2Fp887eGt9S89K94cLzL%2BQQ7mUYiloKW02LOENAIAJMu5mqyzmbyUi%2BkJWUcABDf9SKOArn742XqPLN80dG%2BjzEIYxy6cUzAghEgABRN4xdcySfy0oux9SFyXn5llbWHl3Mnb6rbmP6icPkON7%2B1WzZ9E%2BG2IDPDmJ5A69TOxGm5PsXyyN%2F7pllLIMwoTDs1jRsNC3EISAQAcKm53Ym2xkm5flzmZE%2F98IaSQQwHm3vVy87mVhDiCP46SDet%2FNutnM2l5UCbmcYg3N3RhN9a7W8vLNOzBiMjsYY0gUFEIgAEcD2NmPHdiSXzRCfCCMxaqLKKzfoqwyjXliJMwQEIkDk8Its3y%2BLk5VMJsOgwEBOr2rSyfDYwpeukaACw4Sh6xf4J9wFkgQxiJA4OvGJFoksMJRn3hre9eT8CuMEA4ShJqAQCw0IRIA4CsXO5k2QOPTjexeGWxDPr5OgAjvRBBR%2Fb9EEFC6hkFBwMUPyb%2FneBu44Lb8Ti8YnZtLci6Ar%2Fu7tn0hwYXlRrlYRiPBAGLYsx495BkAgAiRQKBYKOTqygCcA909UeeNWyft%2FLEQIQ4QhmAemFDBSKNZqTWl6m71u%2FGAu71VsWankBn783XvcoU0XhrpP6H6BOAQEIoAh2N2NXw8AAszN5dkfFgZ%2B7PVbzAuEIcIQzITrMSAUtTSO9yJG0UxO3xz8sTMUyDZOGOJKBkAgAuyAZBYzef16%2FzjEV64tybqFBdGIte%2B6fvcTMpIBEIgAw4ViWoVihoLbCefcSv8i2G%2FdUdczlqSkr3XLRhgC9AMTCcCgw8MvgtsruE2pk6Sy3nLl3O29cYjvLnMxSK4wdPx17ddIRRwCIBABJqHXmaXmHSgWmc%2BJ5Lkz%2BT3%2FdnEF4ZAkdN3q%2Bq35wpC2eADDwMUMMOoB0%2B31rK9sLivZTJo4xYRwtk%2B28kv3LAYmIRc8yybxBACBCDADOpnPQpxiQji%2FSwx%2B8%2FwRBiXmqBvZshzabAIgEAHmcAh5h4%2FTdCWVsiWbzfhikQ4t8ePlWw3v%2Fx88t9N3NSaxxcDEjI4b2RHbdnyLPwBMDv4xgCAOpnY3vkkLbzctAt9jyPcvlu%2F%2F%2BcwyIj9WFzVvvem60%2FXnxwkjDgEQiABRw3YcPztSsyRbJLXEhufPPQgTuLBG1nrkL2XSiQmudbORbSoNAAQKLmaAkNDgeNc7wKxel5YssYpR5tydjsBYq%2BXlHTqoRBY%2FttB2sNIDIBABknCouf5LYxUznlAkAzp69BJVXrmxyGBEcP3YGu9LbCEAAhEgiejh1suATqdSvlgksSUanF5tyVY9Ky9dywkJKvNHLfCabKKikJqFAAhEAKMOwPsu6HS6Y1nMphGL8xSJN%2FJyfgX38twuUKIXqE4WMqIQAIEIYDx%2BuZyWK62WIBbnyJtX03J%2BnWSHmYtCu%2BM%2BpmYhAAIRABCLkePZM7ZcrSIQw0atg0430QRRCBBNUvkPfQ47PkAM8MVipiMYNX4RIHYXH8clphAgJmBBBIjTAavWFsv2BWJaLYtd0QgQyTnrOGK7bbKPARCIADALegkuvXSKbCYjaU8o4oqGec%2FLTkkn6hQCIBABYO74XSS8l8Yt9srnZLAuQshogonr1yjESgiAQASASHO%2FfE737z2hmKY4NwRAL7GEWEIABCIAxPlAvx%2B72BWMXaGIYIRh9CyEjtv7HbcxAAIRAJIpGLtt%2F%2B4LxvtiMeX%2FTgyjufRiCH0rNBZCAAQiABgsGLsWxp5LOqUxjCoau4IRK2My6VgH2%2F6zd7slaAAAEIgA0F84aA9cP%2BlF7lsZ%2FbI620Sj%2Fo6lMT6oJbDtC8GeIGyTUAIACEQAmF5guLtEY8oXjR3h2Psz1sY5i3u1CnbjBdUe2CZuEAAQiAAwUzHix6u197gmdwhH7%2B9%2BXKP%2BG91fAsMXfW3xXcO%2BNVDauIgBAIEIADESjtaDj6lITG0Xj2pxTAku634CUMQXf9JuIwIBAIEIAMnFz4p1BgudnvVRuuIx1fnH%2B%2F8Wd0vkfXdv1%2FrXE4H6S%2F%2BHOxgAEIgAALvoWR99MTWCtcy3SG4TjP6f03sFZLorNAMVuv1%2B%2Fq7rd%2FvnkQwCAAhEAIAZ4gu13QLMYVwAAKaFlEMAAAAAQCACAAAAAAIRAAAAABCIAAAAAIBABAAAAAAEIgAAAAAgEAEAAAAAgQgAAAAACEQAAAAAQCACAAAAAAIRAAAAABCIAAAAAIBABAAAAAAEIgAAAAAgEAEAAAAAgQgAAAAACEQAAAAAQCACAAAAAAIRAAAAABCIAAAAAAAIRAAAAABAIAIAAAAAAhEAAAAAEIgAAAAAgEAEAAAAAAQiAAAAACAQAQAAAACBCAAAAACz478LMAA53Eh%2FTCXfIgAAAABJRU5ErkJggg%3D%3D%22%29%20center%20top%20no%2Drepeat%3B%0A%7D%0A%2Ehero%20%2Econtainer%20%7B%0Aheight%3A%20600px%3B%0A%7D%0A%2Ehero%20%2Ehero%2Dtext%20%7B%0Atop%3A%20auto%3B%0Aheight%3A%20auto%3B%0Abottom%3A%200%3B%0Apadding%2Dbottom%3A%2060px%3B%0A%7D%0A%2Ehero%20%2Ehero%2Dtext%20h1%2Etitle%20%7B%0Amargin%2Dbottom%3A%200%3B%0Afont%2Dsize%3A%2036px%3B%0A%7D%0A%2Ehero%20%2Ehero%2Dtext%20h3%2Eauthor%20%7B%0Amargin%2Dbottom%3A%2010px%3B%0Afont%2Dsize%3A%2030px%3B%0A%7D%0A%2Ehero%20%2Ehero%2Dtext%20p%2Edate%20%7B%0Amargin%2Dbottom%3A%2030px%3B%0A%7D%0A%2Ehero%20%2Ehero%2Dtext%20img%2Ebrand%2Dlogo%20%7B%0Aheight%3A%2080px%3B%0A%7D%0Afooter%20%7B%0Abackground%3A%20%23042742%3B%0A%7D%0A" rel="stylesheet">
<style type="text/css">
div.sourceCode { overflow-x: auto; }
table.sourceCode, tr.sourceCode, td.lineNumbers, td.sourceCode {
margin: 0; padding: 0; vertical-align: baseline; border: none; }
table.sourceCode { width: 100%; line-height: 100%; background-color: #f8f8f8; }
td.lineNumbers { text-align: right; padding-right: 4px; padding-left: 4px; color: #aaaaaa; border-right: 1px solid #aaaaaa; }
td.sourceCode { padding-left: 5px; }
pre, code { background-color: #f8f8f8; }
code > span.kw { color: #204a87; font-weight: bold; } /* Keyword */
code > span.dt { color: #204a87; } /* DataType */
code > span.dv { color: #0000cf; } /* DecVal */
code > span.bn { color: #0000cf; } /* BaseN */
code > span.fl { color: #0000cf; } /* Float */
code > span.ch { color: #4e9a06; } /* Char */
code > span.st { color: #4e9a06; } /* String */
code > span.co { color: #8f5902; font-style: italic; } /* Comment */
code > span.ot { color: #8f5902; } /* Other */
code > span.al { color: #ef2929; } /* Alert */
code > span.fu { color: #000000; } /* Function */
code > span.er { color: #a40000; font-weight: bold; } /* Error */
code > span.wa { color: #8f5902; font-weight: bold; font-style: italic; } /* Warning */
code > span.cn { color: #000000; } /* Constant */
code > span.sc { color: #000000; } /* SpecialChar */
code > span.vs { color: #4e9a06; } /* VerbatimString */
code > span.ss { color: #4e9a06; } /* SpecialString */
code > span.im { } /* Import */
code > span.va { color: #000000; } /* Variable */
code > span.cf { color: #204a87; font-weight: bold; } /* ControlFlow */
code > span.op { color: #ce5c00; font-weight: bold; } /* Operator */
code > span.pp { color: #8f5902; font-style: italic; } /* Preprocessor */
code > span.ex { } /* Extension */
code > span.at { color: #c4a000; } /* Attribute */
code > span.do { color: #8f5902; font-weight: bold; font-style: italic; } /* Documentation */
code > span.an { color: #8f5902; font-weight: bold; font-style: italic; } /* Annotation */
code > span.cv { color: #8f5902; font-weight: bold; font-style: italic; } /* CommentVar */
code > span.in { color: #8f5902; font-weight: bold; font-style: italic; } /* Information */
</style>
<script src="data:application/x-javascript;base64,(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/*!
 * jQuery JavaScript Library v2.1.1
 * http://jquery.com/
 *
 * Includes Sizzle.js
 * http://sizzlejs.com/
 *
 * Copyright 2005, 2014 jQuery Foundation, Inc. and other contributors
 * Released under the MIT license
 * http://jquery.org/license
 *
 * Date: 2014-05-01T17:11Z
 */

(function( global, factory ) {

	if ( typeof module === "object" && typeof module.exports === "object" ) {
		// For CommonJS and CommonJS-like environments where a proper window is present,
		// execute the factory and get jQuery
		// For environments that do not inherently posses a window with a document
		// (such as Node.js), expose a jQuery-making factory as module.exports
		// This accentuates the need for the creation of a real window
		// e.g. var jQuery = require("jquery")(window);
		// See ticket #14549 for more info
		module.exports = global.document ?
			factory( global, true ) :
			function( w ) {
				if ( !w.document ) {
					throw new Error( "jQuery requires a window with a document" );
				}
				return factory( w );
			};
	} else {
		factory( global );
	}

// Pass this if window is not defined yet
}(typeof window !== "undefined" ? window : this, function( window, noGlobal ) {

// Can't do this because several apps including ASP.NET trace
// the stack via arguments.caller.callee and Firefox dies if
// you try to trace through "use strict" call chains. (#13335)
// Support: Firefox 18+
//

var arr = [];

var slice = arr.slice;

var concat = arr.concat;

var push = arr.push;

var indexOf = arr.indexOf;

var class2type = {};

var toString = class2type.toString;

var hasOwn = class2type.hasOwnProperty;

var support = {};



var
	// Use the correct document accordingly with window argument (sandbox)
	document = window.document,

	version = "2.1.1",

	// Define a local copy of jQuery
	jQuery = function( selector, context ) {
		// The jQuery object is actually just the init constructor 'enhanced'
		// Need init if jQuery is called (just allow error to be thrown if not included)
		return new jQuery.fn.init( selector, context );
	},

	// Support: Android<4.1
	// Make sure we trim BOM and NBSP
	rtrim = /^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g,

	// Matches dashed string for camelizing
	rmsPrefix = /^-ms-/,
	rdashAlpha = /-([\da-z])/gi,

	// Used by jQuery.camelCase as callback to replace()
	fcamelCase = function( all, letter ) {
		return letter.toUpperCase();
	};

jQuery.fn = jQuery.prototype = {
	// The current version of jQuery being used
	jquery: version,

	constructor: jQuery,

	// Start with an empty selector
	selector: "",

	// The default length of a jQuery object is 0
	length: 0,

	toArray: function() {
		return slice.call( this );
	},

	// Get the Nth element in the matched element set OR
	// Get the whole matched element set as a clean array
	get: function( num ) {
		return num != null ?

			// Return just the one element from the set
			( num < 0 ? this[ num + this.length ] : this[ num ] ) :

			// Return all the elements in a clean array
			slice.call( this );
	},

	// Take an array of elements and push it onto the stack
	// (returning the new matched element set)
	pushStack: function( elems ) {

		// Build a new jQuery matched element set
		var ret = jQuery.merge( this.constructor(), elems );

		// Add the old object onto the stack (as a reference)
		ret.prevObject = this;
		ret.context = this.context;

		// Return the newly-formed element set
		return ret;
	},

	// Execute a callback for every element in the matched set.
	// (You can seed the arguments with an array of args, but this is
	// only used internally.)
	each: function( callback, args ) {
		return jQuery.each( this, callback, args );
	},

	map: function( callback ) {
		return this.pushStack( jQuery.map(this, function( elem, i ) {
			return callback.call( elem, i, elem );
		}));
	},

	slice: function() {
		return this.pushStack( slice.apply( this, arguments ) );
	},

	first: function() {
		return this.eq( 0 );
	},

	last: function() {
		return this.eq( -1 );
	},

	eq: function( i ) {
		var len = this.length,
			j = +i + ( i < 0 ? len : 0 );
		return this.pushStack( j >= 0 && j < len ? [ this[j] ] : [] );
	},

	end: function() {
		return this.prevObject || this.constructor(null);
	},

	// For internal use only.
	// Behaves like an Array's method, not like a jQuery method.
	push: push,
	sort: arr.sort,
	splice: arr.splice
};

jQuery.extend = jQuery.fn.extend = function() {
	var options, name, src, copy, copyIsArray, clone,
		target = arguments[0] || {},
		i = 1,
		length = arguments.length,
		deep = false;

	// Handle a deep copy situation
	if ( typeof target === "boolean" ) {
		deep = target;

		// skip the boolean and the target
		target = arguments[ i ] || {};
		i++;
	}

	// Handle case when target is a string or something (possible in deep copy)
	if ( typeof target !== "object" && !jQuery.isFunction(target) ) {
		target = {};
	}

	// extend jQuery itself if only one argument is passed
	if ( i === length ) {
		target = this;
		i--;
	}

	for ( ; i < length; i++ ) {
		// Only deal with non-null/undefined values
		if ( (options = arguments[ i ]) != null ) {
			// Extend the base object
			for ( name in options ) {
				src = target[ name ];
				copy = options[ name ];

				// Prevent never-ending loop
				if ( target === copy ) {
					continue;
				}

				// Recurse if we're merging plain objects or arrays
				if ( deep && copy && ( jQuery.isPlainObject(copy) || (copyIsArray = jQuery.isArray(copy)) ) ) {
					if ( copyIsArray ) {
						copyIsArray = false;
						clone = src && jQuery.isArray(src) ? src : [];

					} else {
						clone = src && jQuery.isPlainObject(src) ? src : {};
					}

					// Never move original objects, clone them
					target[ name ] = jQuery.extend( deep, clone, copy );

				// Don't bring in undefined values
				} else if ( copy !== undefined ) {
					target[ name ] = copy;
				}
			}
		}
	}

	// Return the modified object
	return target;
};

jQuery.extend({
	// Unique for each copy of jQuery on the page
	expando: "jQuery" + ( version + Math.random() ).replace( /\D/g, "" ),

	// Assume jQuery is ready without the ready module
	isReady: true,

	error: function( msg ) {
		throw new Error( msg );
	},

	noop: function() {},

	// See test/unit/core.js for details concerning isFunction.
	// Since version 1.3, DOM methods and functions like alert
	// aren't supported. They return false on IE (#2968).
	isFunction: function( obj ) {
		return jQuery.type(obj) === "function";
	},

	isArray: Array.isArray,

	isWindow: function( obj ) {
		return obj != null && obj === obj.window;
	},

	isNumeric: function( obj ) {
		// parseFloat NaNs numeric-cast false positives (null|true|false|"")
		// ...but misinterprets leading-number strings, particularly hex literals ("0x...")
		// subtraction forces infinities to NaN
		return !jQuery.isArray( obj ) && obj - parseFloat( obj ) >= 0;
	},

	isPlainObject: function( obj ) {
		// Not plain objects:
		// - Any object or value whose internal [[Class]] property is not "[object Object]"
		// - DOM nodes
		// - window
		if ( jQuery.type( obj ) !== "object" || obj.nodeType || jQuery.isWindow( obj ) ) {
			return false;
		}

		if ( obj.constructor &&
				!hasOwn.call( obj.constructor.prototype, "isPrototypeOf" ) ) {
			return false;
		}

		// If the function hasn't returned already, we're confident that
		// |obj| is a plain object, created by {} or constructed with new Object
		return true;
	},

	isEmptyObject: function( obj ) {
		var name;
		for ( name in obj ) {
			return false;
		}
		return true;
	},

	type: function( obj ) {
		if ( obj == null ) {
			return obj + "";
		}
		// Support: Android < 4.0, iOS < 6 (functionish RegExp)
		return typeof obj === "object" || typeof obj === "function" ?
			class2type[ toString.call(obj) ] || "object" :
			typeof obj;
	},

	// Evaluates a script in a global context
	globalEval: function( code ) {
		var script,
			indirect = eval;

		code = jQuery.trim( code );

		if ( code ) {
			// If the code includes a valid, prologue position
			// strict mode pragma, execute code by injecting a
			// script tag into the document.
			if ( code.indexOf("use strict") === 1 ) {
				script = document.createElement("script");
				script.text = code;
				document.head.appendChild( script ).parentNode.removeChild( script );
			} else {
			// Otherwise, avoid the DOM node creation, insertion
			// and removal by using an indirect global eval
				indirect( code );
			}
		}
	},

	// Convert dashed to camelCase; used by the css and data modules
	// Microsoft forgot to hump their vendor prefix (#9572)
	camelCase: function( string ) {
		return string.replace( rmsPrefix, "ms-" ).replace( rdashAlpha, fcamelCase );
	},

	nodeName: function( elem, name ) {
		return elem.nodeName && elem.nodeName.toLowerCase() === name.toLowerCase();
	},

	// args is for internal usage only
	each: function( obj, callback, args ) {
		var value,
			i = 0,
			length = obj.length,
			isArray = isArraylike( obj );

		if ( args ) {
			if ( isArray ) {
				for ( ; i < length; i++ ) {
					value = callback.apply( obj[ i ], args );

					if ( value === false ) {
						break;
					}
				}
			} else {
				for ( i in obj ) {
					value = callback.apply( obj[ i ], args );

					if ( value === false ) {
						break;
					}
				}
			}

		// A special, fast, case for the most common use of each
		} else {
			if ( isArray ) {
				for ( ; i < length; i++ ) {
					value = callback.call( obj[ i ], i, obj[ i ] );

					if ( value === false ) {
						break;
					}
				}
			} else {
				for ( i in obj ) {
					value = callback.call( obj[ i ], i, obj[ i ] );

					if ( value === false ) {
						break;
					}
				}
			}
		}

		return obj;
	},

	// Support: Android<4.1
	trim: function( text ) {
		return text == null ?
			"" :
			( text + "" ).replace( rtrim, "" );
	},

	// results is for internal usage only
	makeArray: function( arr, results ) {
		var ret = results || [];

		if ( arr != null ) {
			if ( isArraylike( Object(arr) ) ) {
				jQuery.merge( ret,
					typeof arr === "string" ?
					[ arr ] : arr
				);
			} else {
				push.call( ret, arr );
			}
		}

		return ret;
	},

	inArray: function( elem, arr, i ) {
		return arr == null ? -1 : indexOf.call( arr, elem, i );
	},

	merge: function( first, second ) {
		var len = +second.length,
			j = 0,
			i = first.length;

		for ( ; j < len; j++ ) {
			first[ i++ ] = second[ j ];
		}

		first.length = i;

		return first;
	},

	grep: function( elems, callback, invert ) {
		var callbackInverse,
			matches = [],
			i = 0,
			length = elems.length,
			callbackExpect = !invert;

		// Go through the array, only saving the items
		// that pass the validator function
		for ( ; i < length; i++ ) {
			callbackInverse = !callback( elems[ i ], i );
			if ( callbackInverse !== callbackExpect ) {
				matches.push( elems[ i ] );
			}
		}

		return matches;
	},

	// arg is for internal usage only
	map: function( elems, callback, arg ) {
		var value,
			i = 0,
			length = elems.length,
			isArray = isArraylike( elems ),
			ret = [];

		// Go through the array, translating each of the items to their new values
		if ( isArray ) {
			for ( ; i < length; i++ ) {
				value = callback( elems[ i ], i, arg );

				if ( value != null ) {
					ret.push( value );
				}
			}

		// Go through every key on the object,
		} else {
			for ( i in elems ) {
				value = callback( elems[ i ], i, arg );

				if ( value != null ) {
					ret.push( value );
				}
			}
		}

		// Flatten any nested arrays
		return concat.apply( [], ret );
	},

	// A global GUID counter for objects
	guid: 1,

	// Bind a function to a context, optionally partially applying any
	// arguments.
	proxy: function( fn, context ) {
		var tmp, args, proxy;

		if ( typeof context === "string" ) {
			tmp = fn[ context ];
			context = fn;
			fn = tmp;
		}

		// Quick check to determine if target is callable, in the spec
		// this throws a TypeError, but we will just return undefined.
		if ( !jQuery.isFunction( fn ) ) {
			return undefined;
		}

		// Simulated bind
		args = slice.call( arguments, 2 );
		proxy = function() {
			return fn.apply( context || this, args.concat( slice.call( arguments ) ) );
		};

		// Set the guid of unique handler to the same of original handler, so it can be removed
		proxy.guid = fn.guid = fn.guid || jQuery.guid++;

		return proxy;
	},

	now: Date.now,

	// jQuery.support is not used in Core but other projects attach their
	// properties to it so it needs to exist.
	support: support
});

// Populate the class2type map
jQuery.each("Boolean Number String Function Array Date RegExp Object Error".split(" "), function(i, name) {
	class2type[ "[object " + name + "]" ] = name.toLowerCase();
});

function isArraylike( obj ) {
	var length = obj.length,
		type = jQuery.type( obj );

	if ( type === "function" || jQuery.isWindow( obj ) ) {
		return false;
	}

	if ( obj.nodeType === 1 && length ) {
		return true;
	}

	return type === "array" || length === 0 ||
		typeof length === "number" && length > 0 && ( length - 1 ) in obj;
}
var Sizzle =
/*!
 * Sizzle CSS Selector Engine v1.10.19
 * http://sizzlejs.com/
 *
 * Copyright 2013 jQuery Foundation, Inc. and other contributors
 * Released under the MIT license
 * http://jquery.org/license
 *
 * Date: 2014-04-18
 */
(function( window ) {

var i,
	support,
	Expr,
	getText,
	isXML,
	tokenize,
	compile,
	select,
	outermostContext,
	sortInput,
	hasDuplicate,

	// Local document vars
	setDocument,
	document,
	docElem,
	documentIsHTML,
	rbuggyQSA,
	rbuggyMatches,
	matches,
	contains,

	// Instance-specific data
	expando = "sizzle" + -(new Date()),
	preferredDoc = window.document,
	dirruns = 0,
	done = 0,
	classCache = createCache(),
	tokenCache = createCache(),
	compilerCache = createCache(),
	sortOrder = function( a, b ) {
		if ( a === b ) {
			hasDuplicate = true;
		}
		return 0;
	},

	// General-purpose constants
	strundefined = typeof undefined,
	MAX_NEGATIVE = 1 << 31,

	// Instance methods
	hasOwn = ({}).hasOwnProperty,
	arr = [],
	pop = arr.pop,
	push_native = arr.push,
	push = arr.push,
	slice = arr.slice,
	// Use a stripped-down indexOf if we can't use a native one
	indexOf = arr.indexOf || function( elem ) {
		var i = 0,
			len = this.length;
		for ( ; i < len; i++ ) {
			if ( this[i] === elem ) {
				return i;
			}
		}
		return -1;
	},

	booleans = "checked|selected|async|autofocus|autoplay|controls|defer|disabled|hidden|ismap|loop|multiple|open|readonly|required|scoped",

	// Regular expressions

	// Whitespace characters http://www.w3.org/TR/css3-selectors/#whitespace
	whitespace = "[\\x20\\t\\r\\n\\f]",
	// http://www.w3.org/TR/css3-syntax/#characters
	characterEncoding = "(?:\\\\.|[\\w-]|[^\\x00-\\xa0])+",

	// Loosely modeled on CSS identifier characters
	// An unquoted value should be a CSS identifier http://www.w3.org/TR/css3-selectors/#attribute-selectors
	// Proper syntax: http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier
	identifier = characterEncoding.replace( "w", "w#" ),

	// Attribute selectors: http://www.w3.org/TR/selectors/#attribute-selectors
	attributes = "\\[" + whitespace + "*(" + characterEncoding + ")(?:" + whitespace +
		// Operator (capture 2)
		"*([*^$|!~]?=)" + whitespace +
		// "Attribute values must be CSS identifiers [capture 5] or strings [capture 3 or capture 4]"
		"*(?:'((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\"|(" + identifier + "))|)" + whitespace +
		"*\\]",

	pseudos = ":(" + characterEncoding + ")(?:\\((" +
		// To reduce the number of selectors needing tokenize in the preFilter, prefer arguments:
		// 1. quoted (capture 3; capture 4 or capture 5)
		"('((?:\\\\.|[^\\\\'])*)'|\"((?:\\\\.|[^\\\\\"])*)\")|" +
		// 2. simple (capture 6)
		"((?:\\\\.|[^\\\\()[\\]]|" + attributes + ")*)|" +
		// 3. anything else (capture 2)
		".*" +
		")\\)|)",

	// Leading and non-escaped trailing whitespace, capturing some non-whitespace characters preceding the latter
	rtrim = new RegExp( "^" + whitespace + "+|((?:^|[^\\\\])(?:\\\\.)*)" + whitespace + "+$", "g" ),

	rcomma = new RegExp( "^" + whitespace + "*," + whitespace + "*" ),
	rcombinators = new RegExp( "^" + whitespace + "*([>+~]|" + whitespace + ")" + whitespace + "*" ),

	rattributeQuotes = new RegExp( "=" + whitespace + "*([^\\]'\"]*?)" + whitespace + "*\\]", "g" ),

	rpseudo = new RegExp( pseudos ),
	ridentifier = new RegExp( "^" + identifier + "$" ),

	matchExpr = {
		"ID": new RegExp( "^#(" + characterEncoding + ")" ),
		"CLASS": new RegExp( "^\\.(" + characterEncoding + ")" ),
		"TAG": new RegExp( "^(" + characterEncoding.replace( "w", "w*" ) + ")" ),
		"ATTR": new RegExp( "^" + attributes ),
		"PSEUDO": new RegExp( "^" + pseudos ),
		"CHILD": new RegExp( "^:(only|first|last|nth|nth-last)-(child|of-type)(?:\\(" + whitespace +
			"*(even|odd|(([+-]|)(\\d*)n|)" + whitespace + "*(?:([+-]|)" + whitespace +
			"*(\\d+)|))" + whitespace + "*\\)|)", "i" ),
		"bool": new RegExp( "^(?:" + booleans + ")$", "i" ),
		// For use in libraries implementing .is()
		// We use this for POS matching in `select`
		"needsContext": new RegExp( "^" + whitespace + "*[>+~]|:(even|odd|eq|gt|lt|nth|first|last)(?:\\(" +
			whitespace + "*((?:-\\d)?\\d*)" + whitespace + "*\\)|)(?=[^-]|$)", "i" )
	},

	rinputs = /^(?:input|select|textarea|button)$/i,
	rheader = /^h\d$/i,

	rnative = /^[^{]+\{\s*\[native \w/,

	// Easily-parseable/retrievable ID or TAG or CLASS selectors
	rquickExpr = /^(?:#([\w-]+)|(\w+)|\.([\w-]+))$/,

	rsibling = /[+~]/,
	rescape = /'|\\/g,

	// CSS escapes http://www.w3.org/TR/CSS21/syndata.html#escaped-characters
	runescape = new RegExp( "\\\\([\\da-f]{1,6}" + whitespace + "?|(" + whitespace + ")|.)", "ig" ),
	funescape = function( _, escaped, escapedWhitespace ) {
		var high = "0x" + escaped - 0x10000;
		// NaN means non-codepoint
		// Support: Firefox<24
		// Workaround erroneous numeric interpretation of +"0x"
		return high !== high || escapedWhitespace ?
			escaped :
			high < 0 ?
				// BMP codepoint
				String.fromCharCode( high + 0x10000 ) :
				// Supplemental Plane codepoint (surrogate pair)
				String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
	};

// Optimize for push.apply( _, NodeList )
try {
	push.apply(
		(arr = slice.call( preferredDoc.childNodes )),
		preferredDoc.childNodes
	);
	// Support: Android<4.0
	// Detect silently failing push.apply
	arr[ preferredDoc.childNodes.length ].nodeType;
} catch ( e ) {
	push = { apply: arr.length ?

		// Leverage slice if possible
		function( target, els ) {
			push_native.apply( target, slice.call(els) );
		} :

		// Support: IE<9
		// Otherwise append directly
		function( target, els ) {
			var j = target.length,
				i = 0;
			// Can't trust NodeList.length
			while ( (target[j++] = els[i++]) ) {}
			target.length = j - 1;
		}
	};
}

function Sizzle( selector, context, results, seed ) {
	var match, elem, m, nodeType,
		// QSA vars
		i, groups, old, nid, newContext, newSelector;

	if ( ( context ? context.ownerDocument || context : preferredDoc ) !== document ) {
		setDocument( context );
	}

	context = context || document;
	results = results || [];

	if ( !selector || typeof selector !== "string" ) {
		return results;
	}

	if ( (nodeType = context.nodeType) !== 1 && nodeType !== 9 ) {
		return [];
	}

	if ( documentIsHTML && !seed ) {

		// Shortcuts
		if ( (match = rquickExpr.exec( selector )) ) {
			// Speed-up: Sizzle("#ID")
			if ( (m = match[1]) ) {
				if ( nodeType === 9 ) {
					elem = context.getElementById( m );
					// Check parentNode to catch when Blackberry 4.6 returns
					// nodes that are no longer in the document (jQuery #6963)
					if ( elem && elem.parentNode ) {
						// Handle the case where IE, Opera, and Webkit return items
						// by name instead of ID
						if ( elem.id === m ) {
							results.push( elem );
							return results;
						}
					} else {
						return results;
					}
				} else {
					// Context is not a document
					if ( context.ownerDocument && (elem = context.ownerDocument.getElementById( m )) &&
						contains( context, elem ) && elem.id === m ) {
						results.push( elem );
						return results;
					}
				}

			// Speed-up: Sizzle("TAG")
			} else if ( match[2] ) {
				push.apply( results, context.getElementsByTagName( selector ) );
				return results;

			// Speed-up: Sizzle(".CLASS")
			} else if ( (m = match[3]) && support.getElementsByClassName && context.getElementsByClassName ) {
				push.apply( results, context.getElementsByClassName( m ) );
				return results;
			}
		}

		// QSA path
		if ( support.qsa && (!rbuggyQSA || !rbuggyQSA.test( selector )) ) {
			nid = old = expando;
			newContext = context;
			newSelector = nodeType === 9 && selector;

			// qSA works strangely on Element-rooted queries
			// We can work around this by specifying an extra ID on the root
			// and working up from there (Thanks to Andrew Dupont for the technique)
			// IE 8 doesn't work on object elements
			if ( nodeType === 1 && context.nodeName.toLowerCase() !== "object" ) {
				groups = tokenize( selector );

				if ( (old = context.getAttribute("id")) ) {
					nid = old.replace( rescape, "\\$&" );
				} else {
					context.setAttribute( "id", nid );
				}
				nid = "[id='" + nid + "'] ";

				i = groups.length;
				while ( i-- ) {
					groups[i] = nid + toSelector( groups[i] );
				}
				newContext = rsibling.test( selector ) && testContext( context.parentNode ) || context;
				newSelector = groups.join(",");
			}

			if ( newSelector ) {
				try {
					push.apply( results,
						newContext.querySelectorAll( newSelector )
					);
					return results;
				} catch(qsaError) {
				} finally {
					if ( !old ) {
						context.removeAttribute("id");
					}
				}
			}
		}
	}

	// All others
	return select( selector.replace( rtrim, "$1" ), context, results, seed );
}

/**
 * Create key-value caches of limited size
 * @returns {Function(string, Object)} Returns the Object data after storing it on itself with
 *	property name the (space-suffixed) string and (if the cache is larger than Expr.cacheLength)
 *	deleting the oldest entry
 */
function createCache() {
	var keys = [];

	function cache( key, value ) {
		// Use (key + " ") to avoid collision with native prototype properties (see Issue #157)
		if ( keys.push( key + " " ) > Expr.cacheLength ) {
			// Only keep the most recent entries
			delete cache[ keys.shift() ];
		}
		return (cache[ key + " " ] = value);
	}
	return cache;
}

/**
 * Mark a function for special use by Sizzle
 * @param {Function} fn The function to mark
 */
function markFunction( fn ) {
	fn[ expando ] = true;
	return fn;
}

/**
 * Support testing using an element
 * @param {Function} fn Passed the created div and expects a boolean result
 */
function assert( fn ) {
	var div = document.createElement("div");

	try {
		return !!fn( div );
	} catch (e) {
		return false;
	} finally {
		// Remove from its parent by default
		if ( div.parentNode ) {
			div.parentNode.removeChild( div );
		}
		// release memory in IE
		div = null;
	}
}

/**
 * Adds the same handler for all of the specified attrs
 * @param {String} attrs Pipe-separated list of attributes
 * @param {Function} handler The method that will be applied
 */
function addHandle( attrs, handler ) {
	var arr = attrs.split("|"),
		i = attrs.length;

	while ( i-- ) {
		Expr.attrHandle[ arr[i] ] = handler;
	}
}

/**
 * Checks document order of two siblings
 * @param {Element} a
 * @param {Element} b
 * @returns {Number} Returns less than 0 if a precedes b, greater than 0 if a follows b
 */
function siblingCheck( a, b ) {
	var cur = b && a,
		diff = cur && a.nodeType === 1 && b.nodeType === 1 &&
			( ~b.sourceIndex || MAX_NEGATIVE ) -
			( ~a.sourceIndex || MAX_NEGATIVE );

	// Use IE sourceIndex if available on both nodes
	if ( diff ) {
		return diff;
	}

	// Check if b follows a
	if ( cur ) {
		while ( (cur = cur.nextSibling) ) {
			if ( cur === b ) {
				return -1;
			}
		}
	}

	return a ? 1 : -1;
}

/**
 * Returns a function to use in pseudos for input types
 * @param {String} type
 */
function createInputPseudo( type ) {
	return function( elem ) {
		var name = elem.nodeName.toLowerCase();
		return name === "input" && elem.type === type;
	};
}

/**
 * Returns a function to use in pseudos for buttons
 * @param {String} type
 */
function createButtonPseudo( type ) {
	return function( elem ) {
		var name = elem.nodeName.toLowerCase();
		return (name === "input" || name === "button") && elem.type === type;
	};
}

/**
 * Returns a function to use in pseudos for positionals
 * @param {Function} fn
 */
function createPositionalPseudo( fn ) {
	return markFunction(function( argument ) {
		argument = +argument;
		return markFunction(function( seed, matches ) {
			var j,
				matchIndexes = fn( [], seed.length, argument ),
				i = matchIndexes.length;

			// Match elements found at the specified indexes
			while ( i-- ) {
				if ( seed[ (j = matchIndexes[i]) ] ) {
					seed[j] = !(matches[j] = seed[j]);
				}
			}
		});
	});
}

/**
 * Checks a node for validity as a Sizzle context
 * @param {Element|Object=} context
 * @returns {Element|Object|Boolean} The input node if acceptable, otherwise a falsy value
 */
function testContext( context ) {
	return context && typeof context.getElementsByTagName !== strundefined && context;
}

// Expose support vars for convenience
support = Sizzle.support = {};

/**
 * Detects XML nodes
 * @param {Element|Object} elem An element or a document
 * @returns {Boolean} True iff elem is a non-HTML XML node
 */
isXML = Sizzle.isXML = function( elem ) {
	// documentElement is verified for cases where it doesn't yet exist
	// (such as loading iframes in IE - #4833)
	var documentElement = elem && (elem.ownerDocument || elem).documentElement;
	return documentElement ? documentElement.nodeName !== "HTML" : false;
};

/**
 * Sets document-related variables once based on the current document
 * @param {Element|Object} [doc] An element or document object to use to set the document
 * @returns {Object} Returns the current document
 */
setDocument = Sizzle.setDocument = function( node ) {
	var hasCompare,
		doc = node ? node.ownerDocument || node : preferredDoc,
		parent = doc.defaultView;

	// If no document and documentElement is available, return
	if ( doc === document || doc.nodeType !== 9 || !doc.documentElement ) {
		return document;
	}

	// Set our document
	document = doc;
	docElem = doc.documentElement;

	// Support tests
	documentIsHTML = !isXML( doc );

	// Support: IE>8
	// If iframe document is assigned to "document" variable and if iframe has been reloaded,
	// IE will throw "permission denied" error when accessing "document" variable, see jQuery #13936
	// IE6-8 do not support the defaultView property so parent will be undefined
	if ( parent && parent !== parent.top ) {
		// IE11 does not have attachEvent, so all must suffer
		if ( parent.addEventListener ) {
			parent.addEventListener( "unload", function() {
				setDocument();
			}, false );
		} else if ( parent.attachEvent ) {
			parent.attachEvent( "onunload", function() {
				setDocument();
			});
		}
	}

	/* Attributes
	---------------------------------------------------------------------- */

	// Support: IE<8
	// Verify that getAttribute really returns attributes and not properties (excepting IE8 booleans)
	support.attributes = assert(function( div ) {
		div.className = "i";
		return !div.getAttribute("className");
	});

	/* getElement(s)By*
	---------------------------------------------------------------------- */

	// Check if getElementsByTagName("*") returns only elements
	support.getElementsByTagName = assert(function( div ) {
		div.appendChild( doc.createComment("") );
		return !div.getElementsByTagName("*").length;
	});

	// Check if getElementsByClassName can be trusted
	support.getElementsByClassName = rnative.test( doc.getElementsByClassName ) && assert(function( div ) {
		div.innerHTML = "<div class='a'></div><div class='a i'></div>";

		// Support: Safari<4
		// Catch class over-caching
		div.firstChild.className = "i";
		// Support: Opera<10
		// Catch gEBCN failure to find non-leading classes
		return div.getElementsByClassName("i").length === 2;
	});

	// Support: IE<10
	// Check if getElementById returns elements by name
	// The broken getElementById methods don't pick up programatically-set names,
	// so use a roundabout getElementsByName test
	support.getById = assert(function( div ) {
		docElem.appendChild( div ).id = expando;
		return !doc.getElementsByName || !doc.getElementsByName( expando ).length;
	});

	// ID find and filter
	if ( support.getById ) {
		Expr.find["ID"] = function( id, context ) {
			if ( typeof context.getElementById !== strundefined && documentIsHTML ) {
				var m = context.getElementById( id );
				// Check parentNode to catch when Blackberry 4.6 returns
				// nodes that are no longer in the document #6963
				return m && m.parentNode ? [ m ] : [];
			}
		};
		Expr.filter["ID"] = function( id ) {
			var attrId = id.replace( runescape, funescape );
			return function( elem ) {
				return elem.getAttribute("id") === attrId;
			};
		};
	} else {
		// Support: IE6/7
		// getElementById is not reliable as a find shortcut
		delete Expr.find["ID"];

		Expr.filter["ID"] =  function( id ) {
			var attrId = id.replace( runescape, funescape );
			return function( elem ) {
				var node = typeof elem.getAttributeNode !== strundefined && elem.getAttributeNode("id");
				return node && node.value === attrId;
			};
		};
	}

	// Tag
	Expr.find["TAG"] = support.getElementsByTagName ?
		function( tag, context ) {
			if ( typeof context.getElementsByTagName !== strundefined ) {
				return context.getElementsByTagName( tag );
			}
		} :
		function( tag, context ) {
			var elem,
				tmp = [],
				i = 0,
				results = context.getElementsByTagName( tag );

			// Filter out possible comments
			if ( tag === "*" ) {
				while ( (elem = results[i++]) ) {
					if ( elem.nodeType === 1 ) {
						tmp.push( elem );
					}
				}

				return tmp;
			}
			return results;
		};

	// Class
	Expr.find["CLASS"] = support.getElementsByClassName && function( className, context ) {
		if ( typeof context.getElementsByClassName !== strundefined && documentIsHTML ) {
			return context.getElementsByClassName( className );
		}
	};

	/* QSA/matchesSelector
	---------------------------------------------------------------------- */

	// QSA and matchesSelector support

	// matchesSelector(:active) reports false when true (IE9/Opera 11.5)
	rbuggyMatches = [];

	// qSa(:focus) reports false when true (Chrome 21)
	// We allow this because of a bug in IE8/9 that throws an error
	// whenever `document.activeElement` is accessed on an iframe
	// So, we allow :focus to pass through QSA all the time to avoid the IE error
	// See http://bugs.jquery.com/ticket/13378
	rbuggyQSA = [];

	if ( (support.qsa = rnative.test( doc.querySelectorAll )) ) {
		// Build QSA regex
		// Regex strategy adopted from Diego Perini
		assert(function( div ) {
			// Select is set to empty string on purpose
			// This is to test IE's treatment of not explicitly
			// setting a boolean content attribute,
			// since its presence should be enough
			// http://bugs.jquery.com/ticket/12359
			div.innerHTML = "<select msallowclip=''><option selected=''></option></select>";

			// Support: IE8, Opera 11-12.16
			// Nothing should be selected when empty strings follow ^= or $= or *=
			// The test attribute must be unknown in Opera but "safe" for WinRT
			// http://msdn.microsoft.com/en-us/library/ie/hh465388.aspx#attribute_section
			if ( div.querySelectorAll("[msallowclip^='']").length ) {
				rbuggyQSA.push( "[*^$]=" + whitespace + "*(?:''|\"\")" );
			}

			// Support: IE8
			// Boolean attributes and "value" are not treated correctly
			if ( !div.querySelectorAll("[selected]").length ) {
				rbuggyQSA.push( "\\[" + whitespace + "*(?:value|" + booleans + ")" );
			}

			// Webkit/Opera - :checked should return selected option elements
			// http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked
			// IE8 throws error here and will not see later tests
			if ( !div.querySelectorAll(":checked").length ) {
				rbuggyQSA.push(":checked");
			}
		});

		assert(function( div ) {
			// Support: Windows 8 Native Apps
			// The type and name attributes are restricted during .innerHTML assignment
			var input = doc.createElement("input");
			input.setAttribute( "type", "hidden" );
			div.appendChild( input ).setAttribute( "name", "D" );

			// Support: IE8
			// Enforce case-sensitivity of name attribute
			if ( div.querySelectorAll("[name=d]").length ) {
				rbuggyQSA.push( "name" + whitespace + "*[*^$|!~]?=" );
			}

			// FF 3.5 - :enabled/:disabled and hidden elements (hidden elements are still enabled)
			// IE8 throws error here and will not see later tests
			if ( !div.querySelectorAll(":enabled").length ) {
				rbuggyQSA.push( ":enabled", ":disabled" );
			}

			// Opera 10-11 does not throw on post-comma invalid pseudos
			div.querySelectorAll("*,:x");
			rbuggyQSA.push(",.*:");
		});
	}

	if ( (support.matchesSelector = rnative.test( (matches = docElem.matches ||
		docElem.webkitMatchesSelector ||
		docElem.mozMatchesSelector ||
		docElem.oMatchesSelector ||
		docElem.msMatchesSelector) )) ) {

		assert(function( div ) {
			// Check to see if it's possible to do matchesSelector
			// on a disconnected node (IE 9)
			support.disconnectedMatch = matches.call( div, "div" );

			// This should fail with an exception
			// Gecko does not error, returns false instead
			matches.call( div, "[s!='']:x" );
			rbuggyMatches.push( "!=", pseudos );
		});
	}

	rbuggyQSA = rbuggyQSA.length && new RegExp( rbuggyQSA.join("|") );
	rbuggyMatches = rbuggyMatches.length && new RegExp( rbuggyMatches.join("|") );

	/* Contains
	---------------------------------------------------------------------- */
	hasCompare = rnative.test( docElem.compareDocumentPosition );

	// Element contains another
	// Purposefully does not implement inclusive descendent
	// As in, an element does not contain itself
	contains = hasCompare || rnative.test( docElem.contains ) ?
		function( a, b ) {
			var adown = a.nodeType === 9 ? a.documentElement : a,
				bup = b && b.parentNode;
			return a === bup || !!( bup && bup.nodeType === 1 && (
				adown.contains ?
					adown.contains( bup ) :
					a.compareDocumentPosition && a.compareDocumentPosition( bup ) & 16
			));
		} :
		function( a, b ) {
			if ( b ) {
				while ( (b = b.parentNode) ) {
					if ( b === a ) {
						return true;
					}
				}
			}
			return false;
		};

	/* Sorting
	---------------------------------------------------------------------- */

	// Document order sorting
	sortOrder = hasCompare ?
	function( a, b ) {

		// Flag for duplicate removal
		if ( a === b ) {
			hasDuplicate = true;
			return 0;
		}

		// Sort on method existence if only one input has compareDocumentPosition
		var compare = !a.compareDocumentPosition - !b.compareDocumentPosition;
		if ( compare ) {
			return compare;
		}

		// Calculate position if both inputs belong to the same document
		compare = ( a.ownerDocument || a ) === ( b.ownerDocument || b ) ?
			a.compareDocumentPosition( b ) :

			// Otherwise we know they are disconnected
			1;

		// Disconnected nodes
		if ( compare & 1 ||
			(!support.sortDetached && b.compareDocumentPosition( a ) === compare) ) {

			// Choose the first element that is related to our preferred document
			if ( a === doc || a.ownerDocument === preferredDoc && contains(preferredDoc, a) ) {
				return -1;
			}
			if ( b === doc || b.ownerDocument === preferredDoc && contains(preferredDoc, b) ) {
				return 1;
			}

			// Maintain original order
			return sortInput ?
				( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
				0;
		}

		return compare & 4 ? -1 : 1;
	} :
	function( a, b ) {
		// Exit early if the nodes are identical
		if ( a === b ) {
			hasDuplicate = true;
			return 0;
		}

		var cur,
			i = 0,
			aup = a.parentNode,
			bup = b.parentNode,
			ap = [ a ],
			bp = [ b ];

		// Parentless nodes are either documents or disconnected
		if ( !aup || !bup ) {
			return a === doc ? -1 :
				b === doc ? 1 :
				aup ? -1 :
				bup ? 1 :
				sortInput ?
				( indexOf.call( sortInput, a ) - indexOf.call( sortInput, b ) ) :
				0;

		// If the nodes are siblings, we can do a quick check
		} else if ( aup === bup ) {
			return siblingCheck( a, b );
		}

		// Otherwise we need full lists of their ancestors for comparison
		cur = a;
		while ( (cur = cur.parentNode) ) {
			ap.unshift( cur );
		}
		cur = b;
		while ( (cur = cur.parentNode) ) {
			bp.unshift( cur );
		}

		// Walk down the tree looking for a discrepancy
		while ( ap[i] === bp[i] ) {
			i++;
		}

		return i ?
			// Do a sibling check if the nodes have a common ancestor
			siblingCheck( ap[i], bp[i] ) :

			// Otherwise nodes in our document sort first
			ap[i] === preferredDoc ? -1 :
			bp[i] === preferredDoc ? 1 :
			0;
	};

	return doc;
};

Sizzle.matches = function( expr, elements ) {
	return Sizzle( expr, null, null, elements );
};

Sizzle.matchesSelector = function( elem, expr ) {
	// Set document vars if needed
	if ( ( elem.ownerDocument || elem ) !== document ) {
		setDocument( elem );
	}

	// Make sure that attribute selectors are quoted
	expr = expr.replace( rattributeQuotes, "='$1']" );

	if ( support.matchesSelector && documentIsHTML &&
		( !rbuggyMatches || !rbuggyMatches.test( expr ) ) &&
		( !rbuggyQSA     || !rbuggyQSA.test( expr ) ) ) {

		try {
			var ret = matches.call( elem, expr );

			// IE 9's matchesSelector returns false on disconnected nodes
			if ( ret || support.disconnectedMatch ||
					// As well, disconnected nodes are said to be in a document
					// fragment in IE 9
					elem.document && elem.document.nodeType !== 11 ) {
				return ret;
			}
		} catch(e) {}
	}

	return Sizzle( expr, document, null, [ elem ] ).length > 0;
};

Sizzle.contains = function( context, elem ) {
	// Set document vars if needed
	if ( ( context.ownerDocument || context ) !== document ) {
		setDocument( context );
	}
	return contains( context, elem );
};

Sizzle.attr = function( elem, name ) {
	// Set document vars if needed
	if ( ( elem.ownerDocument || elem ) !== document ) {
		setDocument( elem );
	}

	var fn = Expr.attrHandle[ name.toLowerCase() ],
		// Don't get fooled by Object.prototype properties (jQuery #13807)
		val = fn && hasOwn.call( Expr.attrHandle, name.toLowerCase() ) ?
			fn( elem, name, !documentIsHTML ) :
			undefined;

	return val !== undefined ?
		val :
		support.attributes || !documentIsHTML ?
			elem.getAttribute( name ) :
			(val = elem.getAttributeNode(name)) && val.specified ?
				val.value :
				null;
};

Sizzle.error = function( msg ) {
	throw new Error( "Syntax error, unrecognized expression: " + msg );
};

/**
 * Document sorting and removing duplicates
 * @param {ArrayLike} results
 */
Sizzle.uniqueSort = function( results ) {
	var elem,
		duplicates = [],
		j = 0,
		i = 0;

	// Unless we *know* we can detect duplicates, assume their presence
	hasDuplicate = !support.detectDuplicates;
	sortInput = !support.sortStable && results.slice( 0 );
	results.sort( sortOrder );

	if ( hasDuplicate ) {
		while ( (elem = results[i++]) ) {
			if ( elem === results[ i ] ) {
				j = duplicates.push( i );
			}
		}
		while ( j-- ) {
			results.splice( duplicates[ j ], 1 );
		}
	}

	// Clear input after sorting to release objects
	// See https://github.com/jquery/sizzle/pull/225
	sortInput = null;

	return results;
};

/**
 * Utility function for retrieving the text value of an array of DOM nodes
 * @param {Array|Element} elem
 */
getText = Sizzle.getText = function( elem ) {
	var node,
		ret = "",
		i = 0,
		nodeType = elem.nodeType;

	if ( !nodeType ) {
		// If no nodeType, this is expected to be an array
		while ( (node = elem[i++]) ) {
			// Do not traverse comment nodes
			ret += getText( node );
		}
	} else if ( nodeType === 1 || nodeType === 9 || nodeType === 11 ) {
		// Use textContent for elements
		// innerText usage removed for consistency of new lines (jQuery #11153)
		if ( typeof elem.textContent === "string" ) {
			return elem.textContent;
		} else {
			// Traverse its children
			for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
				ret += getText( elem );
			}
		}
	} else if ( nodeType === 3 || nodeType === 4 ) {
		return elem.nodeValue;
	}
	// Do not include comment or processing instruction nodes

	return ret;
};

Expr = Sizzle.selectors = {

	// Can be adjusted by the user
	cacheLength: 50,

	createPseudo: markFunction,

	match: matchExpr,

	attrHandle: {},

	find: {},

	relative: {
		">": { dir: "parentNode", first: true },
		" ": { dir: "parentNode" },
		"+": { dir: "previousSibling", first: true },
		"~": { dir: "previousSibling" }
	},

	preFilter: {
		"ATTR": function( match ) {
			match[1] = match[1].replace( runescape, funescape );

			// Move the given value to match[3] whether quoted or unquoted
			match[3] = ( match[3] || match[4] || match[5] || "" ).replace( runescape, funescape );

			if ( match[2] === "~=" ) {
				match[3] = " " + match[3] + " ";
			}

			return match.slice( 0, 4 );
		},

		"CHILD": function( match ) {
			/* matches from matchExpr["CHILD"]
				1 type (only|nth|...)
				2 what (child|of-type)
				3 argument (even|odd|\d*|\d*n([+-]\d+)?|...)
				4 xn-component of xn+y argument ([+-]?\d*n|)
				5 sign of xn-component
				6 x of xn-component
				7 sign of y-component
				8 y of y-component
			*/
			match[1] = match[1].toLowerCase();

			if ( match[1].slice( 0, 3 ) === "nth" ) {
				// nth-* requires argument
				if ( !match[3] ) {
					Sizzle.error( match[0] );
				}

				// numeric x and y parameters for Expr.filter.CHILD
				// remember that false/true cast respectively to 0/1
				match[4] = +( match[4] ? match[5] + (match[6] || 1) : 2 * ( match[3] === "even" || match[3] === "odd" ) );
				match[5] = +( ( match[7] + match[8] ) || match[3] === "odd" );

			// other types prohibit arguments
			} else if ( match[3] ) {
				Sizzle.error( match[0] );
			}

			return match;
		},

		"PSEUDO": function( match ) {
			var excess,
				unquoted = !match[6] && match[2];

			if ( matchExpr["CHILD"].test( match[0] ) ) {
				return null;
			}

			// Accept quoted arguments as-is
			if ( match[3] ) {
				match[2] = match[4] || match[5] || "";

			// Strip excess characters from unquoted arguments
			} else if ( unquoted && rpseudo.test( unquoted ) &&
				// Get excess from tokenize (recursively)
				(excess = tokenize( unquoted, true )) &&
				// advance to the next closing parenthesis
				(excess = unquoted.indexOf( ")", unquoted.length - excess ) - unquoted.length) ) {

				// excess is a negative index
				match[0] = match[0].slice( 0, excess );
				match[2] = unquoted.slice( 0, excess );
			}

			// Return only captures needed by the pseudo filter method (type and argument)
			return match.slice( 0, 3 );
		}
	},

	filter: {

		"TAG": function( nodeNameSelector ) {
			var nodeName = nodeNameSelector.replace( runescape, funescape ).toLowerCase();
			return nodeNameSelector === "*" ?
				function() { return true; } :
				function( elem ) {
					return elem.nodeName && elem.nodeName.toLowerCase() === nodeName;
				};
		},

		"CLASS": function( className ) {
			var pattern = classCache[ className + " " ];

			return pattern ||
				(pattern = new RegExp( "(^|" + whitespace + ")" + className + "(" + whitespace + "|$)" )) &&
				classCache( className, function( elem ) {
					return pattern.test( typeof elem.className === "string" && elem.className || typeof elem.getAttribute !== strundefined && elem.getAttribute("class") || "" );
				});
		},

		"ATTR": function( name, operator, check ) {
			return function( elem ) {
				var result = Sizzle.attr( elem, name );

				if ( result == null ) {
					return operator === "!=";
				}
				if ( !operator ) {
					return true;
				}

				result += "";

				return operator === "=" ? result === check :
					operator === "!=" ? result !== check :
					operator === "^=" ? check && result.indexOf( check ) === 0 :
					operator === "*=" ? check && result.indexOf( check ) > -1 :
					operator === "$=" ? check && result.slice( -check.length ) === check :
					operator === "~=" ? ( " " + result + " " ).indexOf( check ) > -1 :
					operator === "|=" ? result === check || result.slice( 0, check.length + 1 ) === check + "-" :
					false;
			};
		},

		"CHILD": function( type, what, argument, first, last ) {
			var simple = type.slice( 0, 3 ) !== "nth",
				forward = type.slice( -4 ) !== "last",
				ofType = what === "of-type";

			return first === 1 && last === 0 ?

				// Shortcut for :nth-*(n)
				function( elem ) {
					return !!elem.parentNode;
				} :

				function( elem, context, xml ) {
					var cache, outerCache, node, diff, nodeIndex, start,
						dir = simple !== forward ? "nextSibling" : "previousSibling",
						parent = elem.parentNode,
						name = ofType && elem.nodeName.toLowerCase(),
						useCache = !xml && !ofType;

					if ( parent ) {

						// :(first|last|only)-(child|of-type)
						if ( simple ) {
							while ( dir ) {
								node = elem;
								while ( (node = node[ dir ]) ) {
									if ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) {
										return false;
									}
								}
								// Reverse direction for :only-* (if we haven't yet done so)
								start = dir = type === "only" && !start && "nextSibling";
							}
							return true;
						}

						start = [ forward ? parent.firstChild : parent.lastChild ];

						// non-xml :nth-child(...) stores cache data on `parent`
						if ( forward && useCache ) {
							// Seek `elem` from a previously-cached index
							outerCache = parent[ expando ] || (parent[ expando ] = {});
							cache = outerCache[ type ] || [];
							nodeIndex = cache[0] === dirruns && cache[1];
							diff = cache[0] === dirruns && cache[2];
							node = nodeIndex && parent.childNodes[ nodeIndex ];

							while ( (node = ++nodeIndex && node && node[ dir ] ||

								// Fallback to seeking `elem` from the start
								(diff = nodeIndex = 0) || start.pop()) ) {

								// When found, cache indexes on `parent` and break
								if ( node.nodeType === 1 && ++diff && node === elem ) {
									outerCache[ type ] = [ dirruns, nodeIndex, diff ];
									break;
								}
							}

						// Use previously-cached element index if available
						} else if ( useCache && (cache = (elem[ expando ] || (elem[ expando ] = {}))[ type ]) && cache[0] === dirruns ) {
							diff = cache[1];

						// xml :nth-child(...) or :nth-last-child(...) or :nth(-last)?-of-type(...)
						} else {
							// Use the same loop as above to seek `elem` from the start
							while ( (node = ++nodeIndex && node && node[ dir ] ||
								(diff = nodeIndex = 0) || start.pop()) ) {

								if ( ( ofType ? node.nodeName.toLowerCase() === name : node.nodeType === 1 ) && ++diff ) {
									// Cache the index of each encountered element
									if ( useCache ) {
										(node[ expando ] || (node[ expando ] = {}))[ type ] = [ dirruns, diff ];
									}

									if ( node === elem ) {
										break;
									}
								}
							}
						}

						// Incorporate the offset, then check against cycle size
						diff -= last;
						return diff === first || ( diff % first === 0 && diff / first >= 0 );
					}
				};
		},

		"PSEUDO": function( pseudo, argument ) {
			// pseudo-class names are case-insensitive
			// http://www.w3.org/TR/selectors/#pseudo-classes
			// Prioritize by case sensitivity in case custom pseudos are added with uppercase letters
			// Remember that setFilters inherits from pseudos
			var args,
				fn = Expr.pseudos[ pseudo ] || Expr.setFilters[ pseudo.toLowerCase() ] ||
					Sizzle.error( "unsupported pseudo: " + pseudo );

			// The user may use createPseudo to indicate that
			// arguments are needed to create the filter function
			// just as Sizzle does
			if ( fn[ expando ] ) {
				return fn( argument );
			}

			// But maintain support for old signatures
			if ( fn.length > 1 ) {
				args = [ pseudo, pseudo, "", argument ];
				return Expr.setFilters.hasOwnProperty( pseudo.toLowerCase() ) ?
					markFunction(function( seed, matches ) {
						var idx,
							matched = fn( seed, argument ),
							i = matched.length;
						while ( i-- ) {
							idx = indexOf.call( seed, matched[i] );
							seed[ idx ] = !( matches[ idx ] = matched[i] );
						}
					}) :
					function( elem ) {
						return fn( elem, 0, args );
					};
			}

			return fn;
		}
	},

	pseudos: {
		// Potentially complex pseudos
		"not": markFunction(function( selector ) {
			// Trim the selector passed to compile
			// to avoid treating leading and trailing
			// spaces as combinators
			var input = [],
				results = [],
				matcher = compile( selector.replace( rtrim, "$1" ) );

			return matcher[ expando ] ?
				markFunction(function( seed, matches, context, xml ) {
					var elem,
						unmatched = matcher( seed, null, xml, [] ),
						i = seed.length;

					// Match elements unmatched by `matcher`
					while ( i-- ) {
						if ( (elem = unmatched[i]) ) {
							seed[i] = !(matches[i] = elem);
						}
					}
				}) :
				function( elem, context, xml ) {
					input[0] = elem;
					matcher( input, null, xml, results );
					return !results.pop();
				};
		}),

		"has": markFunction(function( selector ) {
			return function( elem ) {
				return Sizzle( selector, elem ).length > 0;
			};
		}),

		"contains": markFunction(function( text ) {
			return function( elem ) {
				return ( elem.textContent || elem.innerText || getText( elem ) ).indexOf( text ) > -1;
			};
		}),

		// "Whether an element is represented by a :lang() selector
		// is based solely on the element's language value
		// being equal to the identifier C,
		// or beginning with the identifier C immediately followed by "-".
		// The matching of C against the element's language value is performed case-insensitively.
		// The identifier C does not have to be a valid language name."
		// http://www.w3.org/TR/selectors/#lang-pseudo
		"lang": markFunction( function( lang ) {
			// lang value must be a valid identifier
			if ( !ridentifier.test(lang || "") ) {
				Sizzle.error( "unsupported lang: " + lang );
			}
			lang = lang.replace( runescape, funescape ).toLowerCase();
			return function( elem ) {
				var elemLang;
				do {
					if ( (elemLang = documentIsHTML ?
						elem.lang :
						elem.getAttribute("xml:lang") || elem.getAttribute("lang")) ) {

						elemLang = elemLang.toLowerCase();
						return elemLang === lang || elemLang.indexOf( lang + "-" ) === 0;
					}
				} while ( (elem = elem.parentNode) && elem.nodeType === 1 );
				return false;
			};
		}),

		// Miscellaneous
		"target": function( elem ) {
			var hash = window.location && window.location.hash;
			return hash && hash.slice( 1 ) === elem.id;
		},

		"root": function( elem ) {
			return elem === docElem;
		},

		"focus": function( elem ) {
			return elem === document.activeElement && (!document.hasFocus || document.hasFocus()) && !!(elem.type || elem.href || ~elem.tabIndex);
		},

		// Boolean properties
		"enabled": function( elem ) {
			return elem.disabled === false;
		},

		"disabled": function( elem ) {
			return elem.disabled === true;
		},

		"checked": function( elem ) {
			// In CSS3, :checked should return both checked and selected elements
			// http://www.w3.org/TR/2011/REC-css3-selectors-20110929/#checked
			var nodeName = elem.nodeName.toLowerCase();
			return (nodeName === "input" && !!elem.checked) || (nodeName === "option" && !!elem.selected);
		},

		"selected": function( elem ) {
			// Accessing this property makes selected-by-default
			// options in Safari work properly
			if ( elem.parentNode ) {
				elem.parentNode.selectedIndex;
			}

			return elem.selected === true;
		},

		// Contents
		"empty": function( elem ) {
			// http://www.w3.org/TR/selectors/#empty-pseudo
			// :empty is negated by element (1) or content nodes (text: 3; cdata: 4; entity ref: 5),
			//   but not by others (comment: 8; processing instruction: 7; etc.)
			// nodeType < 6 works because attributes (2) do not appear as children
			for ( elem = elem.firstChild; elem; elem = elem.nextSibling ) {
				if ( elem.nodeType < 6 ) {
					return false;
				}
			}
			return true;
		},

		"parent": function( elem ) {
			return !Expr.pseudos["empty"]( elem );
		},

		// Element/input types
		"header": function( elem ) {
			return rheader.test( elem.nodeName );
		},

		"input": function( elem ) {
			return rinputs.test( elem.nodeName );
		},

		"button": function( elem ) {
			var name = elem.nodeName.toLowerCase();
			return name === "input" && elem.type === "button" || name === "button";
		},

		"text": function( elem ) {
			var attr;
			return elem.nodeName.toLowerCase() === "input" &&
				elem.type === "text" &&

				// Support: IE<8
				// New HTML5 attribute values (e.g., "search") appear with elem.type === "text"
				( (attr = elem.getAttribute("type")) == null || attr.toLowerCase() === "text" );
		},

		// Position-in-collection
		"first": createPositionalPseudo(function() {
			return [ 0 ];
		}),

		"last": createPositionalPseudo(function( matchIndexes, length ) {
			return [ length - 1 ];
		}),

		"eq": createPositionalPseudo(function( matchIndexes, length, argument ) {
			return [ argument < 0 ? argument + length : argument ];
		}),

		"even": createPositionalPseudo(function( matchIndexes, length ) {
			var i = 0;
			for ( ; i < length; i += 2 ) {
				matchIndexes.push( i );
			}
			return matchIndexes;
		}),

		"odd": createPositionalPseudo(function( matchIndexes, length ) {
			var i = 1;
			for ( ; i < length; i += 2 ) {
				matchIndexes.push( i );
			}
			return matchIndexes;
		}),

		"lt": createPositionalPseudo(function( matchIndexes, length, argument ) {
			var i = argument < 0 ? argument + length : argument;
			for ( ; --i >= 0; ) {
				matchIndexes.push( i );
			}
			return matchIndexes;
		}),

		"gt": createPositionalPseudo(function( matchIndexes, length, argument ) {
			var i = argument < 0 ? argument + length : argument;
			for ( ; ++i < length; ) {
				matchIndexes.push( i );
			}
			return matchIndexes;
		})
	}
};

Expr.pseudos["nth"] = Expr.pseudos["eq"];

// Add button/input type pseudos
for ( i in { radio: true, checkbox: true, file: true, password: true, image: true } ) {
	Expr.pseudos[ i ] = createInputPseudo( i );
}
for ( i in { submit: true, reset: true } ) {
	Expr.pseudos[ i ] = createButtonPseudo( i );
}

// Easy API for creating new setFilters
function setFilters() {}
setFilters.prototype = Expr.filters = Expr.pseudos;
Expr.setFilters = new setFilters();

tokenize = Sizzle.tokenize = function( selector, parseOnly ) {
	var matched, match, tokens, type,
		soFar, groups, preFilters,
		cached = tokenCache[ selector + " " ];

	if ( cached ) {
		return parseOnly ? 0 : cached.slice( 0 );
	}

	soFar = selector;
	groups = [];
	preFilters = Expr.preFilter;

	while ( soFar ) {

		// Comma and first run
		if ( !matched || (match = rcomma.exec( soFar )) ) {
			if ( match ) {
				// Don't consume trailing commas as valid
				soFar = soFar.slice( match[0].length ) || soFar;
			}
			groups.push( (tokens = []) );
		}

		matched = false;

		// Combinators
		if ( (match = rcombinators.exec( soFar )) ) {
			matched = match.shift();
			tokens.push({
				value: matched,
				// Cast descendant combinators to space
				type: match[0].replace( rtrim, " " )
			});
			soFar = soFar.slice( matched.length );
		}

		// Filters
		for ( type in Expr.filter ) {
			if ( (match = matchExpr[ type ].exec( soFar )) && (!preFilters[ type ] ||
				(match = preFilters[ type ]( match ))) ) {
				matched = match.shift();
				tokens.push({
					value: matched,
					type: type,
					matches: match
				});
				soFar = soFar.slice( matched.length );
			}
		}

		if ( !matched ) {
			break;
		}
	}

	// Return the length of the invalid excess
	// if we're just parsing
	// Otherwise, throw an error or return tokens
	return parseOnly ?
		soFar.length :
		soFar ?
			Sizzle.error( selector ) :
			// Cache the tokens
			tokenCache( selector, groups ).slice( 0 );
};

function toSelector( tokens ) {
	var i = 0,
		len = tokens.length,
		selector = "";
	for ( ; i < len; i++ ) {
		selector += tokens[i].value;
	}
	return selector;
}

function addCombinator( matcher, combinator, base ) {
	var dir = combinator.dir,
		checkNonElements = base && dir === "parentNode",
		doneName = done++;

	return combinator.first ?
		// Check against closest ancestor/preceding element
		function( elem, context, xml ) {
			while ( (elem = elem[ dir ]) ) {
				if ( elem.nodeType === 1 || checkNonElements ) {
					return matcher( elem, context, xml );
				}
			}
		} :

		// Check against all ancestor/preceding elements
		function( elem, context, xml ) {
			var oldCache, outerCache,
				newCache = [ dirruns, doneName ];

			// We can't set arbitrary data on XML nodes, so they don't benefit from dir caching
			if ( xml ) {
				while ( (elem = elem[ dir ]) ) {
					if ( elem.nodeType === 1 || checkNonElements ) {
						if ( matcher( elem, context, xml ) ) {
							return true;
						}
					}
				}
			} else {
				while ( (elem = elem[ dir ]) ) {
					if ( elem.nodeType === 1 || checkNonElements ) {
						outerCache = elem[ expando ] || (elem[ expando ] = {});
						if ( (oldCache = outerCache[ dir ]) &&
							oldCache[ 0 ] === dirruns && oldCache[ 1 ] === doneName ) {

							// Assign to newCache so results back-propagate to previous elements
							return (newCache[ 2 ] = oldCache[ 2 ]);
						} else {
							// Reuse newcache so results back-propagate to previous elements
							outerCache[ dir ] = newCache;

							// A match means we're done; a fail means we have to keep checking
							if ( (newCache[ 2 ] = matcher( elem, context, xml )) ) {
								return true;
							}
						}
					}
				}
			}
		};
}

function elementMatcher( matchers ) {
	return matchers.length > 1 ?
		function( elem, context, xml ) {
			var i = matchers.length;
			while ( i-- ) {
				if ( !matchers[i]( elem, context, xml ) ) {
					return false;
				}
			}
			return true;
		} :
		matchers[0];
}

function multipleContexts( selector, contexts, results ) {
	var i = 0,
		len = contexts.length;
	for ( ; i < len; i++ ) {
		Sizzle( selector, contexts[i], results );
	}
	return results;
}

function condense( unmatched, map, filter, context, xml ) {
	var elem,
		newUnmatched = [],
		i = 0,
		len = unmatched.length,
		mapped = map != null;

	for ( ; i < len; i++ ) {
		if ( (elem = unmatched[i]) ) {
			if ( !filter || filter( elem, context, xml ) ) {
				newUnmatched.push( elem );
				if ( mapped ) {
					map.push( i );
				}
			}
		}
	}

	return newUnmatched;
}

function setMatcher( preFilter, selector, matcher, postFilter, postFinder, postSelector ) {
	if ( postFilter && !postFilter[ expando ] ) {
		postFilter = setMatcher( postFilter );
	}
	if ( postFinder && !postFinder[ expando ] ) {
		postFinder = setMatcher( postFinder, postSelector );
	}
	return markFunction(function( seed, results, context, xml ) {
		var temp, i, elem,
			preMap = [],
			postMap = [],
			preexisting = results.length,

			// Get initial elements from seed or context
			elems = seed || multipleContexts( selector || "*", context.nodeType ? [ context ] : context, [] ),

			// Prefilter to get matcher input, preserving a map for seed-results synchronization
			matcherIn = preFilter && ( seed || !selector ) ?
				condense( elems, preMap, preFilter, context, xml ) :
				elems,

			matcherOut = matcher ?
				// If we have a postFinder, or filtered seed, or non-seed postFilter or preexisting results,
				postFinder || ( seed ? preFilter : preexisting || postFilter ) ?

					// ...intermediate processing is necessary
					[] :

					// ...otherwise use results directly
					results :
				matcherIn;

		// Find primary matches
		if ( matcher ) {
			matcher( matcherIn, matcherOut, context, xml );
		}

		// Apply postFilter
		if ( postFilter ) {
			temp = condense( matcherOut, postMap );
			postFilter( temp, [], context, xml );

			// Un-match failing elements by moving them back to matcherIn
			i = temp.length;
			while ( i-- ) {
				if ( (elem = temp[i]) ) {
					matcherOut[ postMap[i] ] = !(matcherIn[ postMap[i] ] = elem);
				}
			}
		}

		if ( seed ) {
			if ( postFinder || preFilter ) {
				if ( postFinder ) {
					// Get the final matcherOut by condensing this intermediate into postFinder contexts
					temp = [];
					i = matcherOut.length;
					while ( i-- ) {
						if ( (elem = matcherOut[i]) ) {
							// Restore matcherIn since elem is not yet a final match
							temp.push( (matcherIn[i] = elem) );
						}
					}
					postFinder( null, (matcherOut = []), temp, xml );
				}

				// Move matched elements from seed to results to keep them synchronized
				i = matcherOut.length;
				while ( i-- ) {
					if ( (elem = matcherOut[i]) &&
						(temp = postFinder ? indexOf.call( seed, elem ) : preMap[i]) > -1 ) {

						seed[temp] = !(results[temp] = elem);
					}
				}
			}

		// Add elements to results, through postFinder if defined
		} else {
			matcherOut = condense(
				matcherOut === results ?
					matcherOut.splice( preexisting, matcherOut.length ) :
					matcherOut
			);
			if ( postFinder ) {
				postFinder( null, results, matcherOut, xml );
			} else {
				push.apply( results, matcherOut );
			}
		}
	});
}

function matcherFromTokens( tokens ) {
	var checkContext, matcher, j,
		len = tokens.length,
		leadingRelative = Expr.relative[ tokens[0].type ],
		implicitRelative = leadingRelative || Expr.relative[" "],
		i = leadingRelative ? 1 : 0,

		// The foundational matcher ensures that elements are reachable from top-level context(s)
		matchContext = addCombinator( function( elem ) {
			return elem === checkContext;
		}, implicitRelative, true ),
		matchAnyContext = addCombinator( function( elem ) {
			return indexOf.call( checkContext, elem ) > -1;
		}, implicitRelative, true ),
		matchers = [ function( elem, context, xml ) {
			return ( !leadingRelative && ( xml || context !== outermostContext ) ) || (
				(checkContext = context).nodeType ?
					matchContext( elem, context, xml ) :
					matchAnyContext( elem, context, xml ) );
		} ];

	for ( ; i < len; i++ ) {
		if ( (matcher = Expr.relative[ tokens[i].type ]) ) {
			matchers = [ addCombinator(elementMatcher( matchers ), matcher) ];
		} else {
			matcher = Expr.filter[ tokens[i].type ].apply( null, tokens[i].matches );

			// Return special upon seeing a positional matcher
			if ( matcher[ expando ] ) {
				// Find the next relative operator (if any) for proper handling
				j = ++i;
				for ( ; j < len; j++ ) {
					if ( Expr.relative[ tokens[j].type ] ) {
						break;
					}
				}
				return setMatcher(
					i > 1 && elementMatcher( matchers ),
					i > 1 && toSelector(
						// If the preceding token was a descendant combinator, insert an implicit any-element `*`
						tokens.slice( 0, i - 1 ).concat({ value: tokens[ i - 2 ].type === " " ? "*" : "" })
					).replace( rtrim, "$1" ),
					matcher,
					i < j && matcherFromTokens( tokens.slice( i, j ) ),
					j < len && matcherFromTokens( (tokens = tokens.slice( j )) ),
					j < len && toSelector( tokens )
				);
			}
			matchers.push( matcher );
		}
	}

	return elementMatcher( matchers );
}

function matcherFromGroupMatchers( elementMatchers, setMatchers ) {
	var bySet = setMatchers.length > 0,
		byElement = elementMatchers.length > 0,
		superMatcher = function( seed, context, xml, results, outermost ) {
			var elem, j, matcher,
				matchedCount = 0,
				i = "0",
				unmatched = seed && [],
				setMatched = [],
				contextBackup = outermostContext,
				// We must always have either seed elements or outermost context
				elems = seed || byElement && Expr.find["TAG"]( "*", outermost ),
				// Use integer dirruns iff this is the outermost matcher
				dirrunsUnique = (dirruns += contextBackup == null ? 1 : Math.random() || 0.1),
				len = elems.length;

			if ( outermost ) {
				outermostContext = context !== document && context;
			}

			// Add elements passing elementMatchers directly to results
			// Keep `i` a string if there are no elements so `matchedCount` will be "00" below
			// Support: IE<9, Safari
			// Tolerate NodeList properties (IE: "length"; Safari: <number>) matching elements by id
			for ( ; i !== len && (elem = elems[i]) != null; i++ ) {
				if ( byElement && elem ) {
					j = 0;
					while ( (matcher = elementMatchers[j++]) ) {
						if ( matcher( elem, context, xml ) ) {
							results.push( elem );
							break;
						}
					}
					if ( outermost ) {
						dirruns = dirrunsUnique;
					}
				}

				// Track unmatched elements for set filters
				if ( bySet ) {
					// They will have gone through all possible matchers
					if ( (elem = !matcher && elem) ) {
						matchedCount--;
					}

					// Lengthen the array for every element, matched or not
					if ( seed ) {
						unmatched.push( elem );
					}
				}
			}

			// Apply set filters to unmatched elements
			matchedCount += i;
			if ( bySet && i !== matchedCount ) {
				j = 0;
				while ( (matcher = setMatchers[j++]) ) {
					matcher( unmatched, setMatched, context, xml );
				}

				if ( seed ) {
					// Reintegrate element matches to eliminate the need for sorting
					if ( matchedCount > 0 ) {
						while ( i-- ) {
							if ( !(unmatched[i] || setMatched[i]) ) {
								setMatched[i] = pop.call( results );
							}
						}
					}

					// Discard index placeholder values to get only actual matches
					setMatched = condense( setMatched );
				}

				// Add matches to results
				push.apply( results, setMatched );

				// Seedless set matches succeeding multiple successful matchers stipulate sorting
				if ( outermost && !seed && setMatched.length > 0 &&
					( matchedCount + setMatchers.length ) > 1 ) {

					Sizzle.uniqueSort( results );
				}
			}

			// Override manipulation of globals by nested matchers
			if ( outermost ) {
				dirruns = dirrunsUnique;
				outermostContext = contextBackup;
			}

			return unmatched;
		};

	return bySet ?
		markFunction( superMatcher ) :
		superMatcher;
}

compile = Sizzle.compile = function( selector, match /* Internal Use Only */ ) {
	var i,
		setMatchers = [],
		elementMatchers = [],
		cached = compilerCache[ selector + " " ];

	if ( !cached ) {
		// Generate a function of recursive functions that can be used to check each element
		if ( !match ) {
			match = tokenize( selector );
		}
		i = match.length;
		while ( i-- ) {
			cached = matcherFromTokens( match[i] );
			if ( cached[ expando ] ) {
				setMatchers.push( cached );
			} else {
				elementMatchers.push( cached );
			}
		}

		// Cache the compiled function
		cached = compilerCache( selector, matcherFromGroupMatchers( elementMatchers, setMatchers ) );

		// Save selector and tokenization
		cached.selector = selector;
	}
	return cached;
};

/**
 * A low-level selection function that works with Sizzle's compiled
 *  selector functions
 * @param {String|Function} selector A selector or a pre-compiled
 *  selector function built with Sizzle.compile
 * @param {Element} context
 * @param {Array} [results]
 * @param {Array} [seed] A set of elements to match against
 */
select = Sizzle.select = function( selector, context, results, seed ) {
	var i, tokens, token, type, find,
		compiled = typeof selector === "function" && selector,
		match = !seed && tokenize( (selector = compiled.selector || selector) );

	results = results || [];

	// Try to minimize operations if there is no seed and only one group
	if ( match.length === 1 ) {

		// Take a shortcut and set the context if the root selector is an ID
		tokens = match[0] = match[0].slice( 0 );
		if ( tokens.length > 2 && (token = tokens[0]).type === "ID" &&
				support.getById && context.nodeType === 9 && documentIsHTML &&
				Expr.relative[ tokens[1].type ] ) {

			context = ( Expr.find["ID"]( token.matches[0].replace(runescape, funescape), context ) || [] )[0];
			if ( !context ) {
				return results;

			// Precompiled matchers will still verify ancestry, so step up a level
			} else if ( compiled ) {
				context = context.parentNode;
			}

			selector = selector.slice( tokens.shift().value.length );
		}

		// Fetch a seed set for right-to-left matching
		i = matchExpr["needsContext"].test( selector ) ? 0 : tokens.length;
		while ( i-- ) {
			token = tokens[i];

			// Abort if we hit a combinator
			if ( Expr.relative[ (type = token.type) ] ) {
				break;
			}
			if ( (find = Expr.find[ type ]) ) {
				// Search, expanding context for leading sibling combinators
				if ( (seed = find(
					token.matches[0].replace( runescape, funescape ),
					rsibling.test( tokens[0].type ) && testContext( context.parentNode ) || context
				)) ) {

					// If seed is empty or no tokens remain, we can return early
					tokens.splice( i, 1 );
					selector = seed.length && toSelector( tokens );
					if ( !selector ) {
						push.apply( results, seed );
						return results;
					}

					break;
				}
			}
		}
	}

	// Compile and execute a filtering function if one is not provided
	// Provide `match` to avoid retokenization if we modified the selector above
	( compiled || compile( selector, match ) )(
		seed,
		context,
		!documentIsHTML,
		results,
		rsibling.test( selector ) && testContext( context.parentNode ) || context
	);
	return results;
};

// One-time assignments

// Sort stability
support.sortStable = expando.split("").sort( sortOrder ).join("") === expando;

// Support: Chrome<14
// Always assume duplicates if they aren't passed to the comparison function
support.detectDuplicates = !!hasDuplicate;

// Initialize against the default document
setDocument();

// Support: Webkit<537.32 - Safari 6.0.3/Chrome 25 (fixed in Chrome 27)
// Detached nodes confoundingly follow *each other*
support.sortDetached = assert(function( div1 ) {
	// Should return 1, but returns 4 (following)
	return div1.compareDocumentPosition( document.createElement("div") ) & 1;
});

// Support: IE<8
// Prevent attribute/property "interpolation"
// http://msdn.microsoft.com/en-us/library/ms536429%28VS.85%29.aspx
if ( !assert(function( div ) {
	div.innerHTML = "<a href='#'></a>";
	return div.firstChild.getAttribute("href") === "#" ;
}) ) {
	addHandle( "type|href|height|width", function( elem, name, isXML ) {
		if ( !isXML ) {
			return elem.getAttribute( name, name.toLowerCase() === "type" ? 1 : 2 );
		}
	});
}

// Support: IE<9
// Use defaultValue in place of getAttribute("value")
if ( !support.attributes || !assert(function( div ) {
	div.innerHTML = "<input/>";
	div.firstChild.setAttribute( "value", "" );
	return div.firstChild.getAttribute( "value" ) === "";
}) ) {
	addHandle( "value", function( elem, name, isXML ) {
		if ( !isXML && elem.nodeName.toLowerCase() === "input" ) {
			return elem.defaultValue;
		}
	});
}

// Support: IE<9
// Use getAttributeNode to fetch booleans when getAttribute lies
if ( !assert(function( div ) {
	return div.getAttribute("disabled") == null;
}) ) {
	addHandle( booleans, function( elem, name, isXML ) {
		var val;
		if ( !isXML ) {
			return elem[ name ] === true ? name.toLowerCase() :
					(val = elem.getAttributeNode( name )) && val.specified ?
					val.value :
				null;
		}
	});
}

return Sizzle;

})( window );



jQuery.find = Sizzle;
jQuery.expr = Sizzle.selectors;
jQuery.expr[":"] = jQuery.expr.pseudos;
jQuery.unique = Sizzle.uniqueSort;
jQuery.text = Sizzle.getText;
jQuery.isXMLDoc = Sizzle.isXML;
jQuery.contains = Sizzle.contains;



var rneedsContext = jQuery.expr.match.needsContext;

var rsingleTag = (/^<(\w+)\s*\/?>(?:<\/\1>|)$/);



var risSimple = /^.[^:#\[\.,]*$/;

// Implement the identical functionality for filter and not
function winnow( elements, qualifier, not ) {
	if ( jQuery.isFunction( qualifier ) ) {
		return jQuery.grep( elements, function( elem, i ) {
			/* jshint -W018 */
			return !!qualifier.call( elem, i, elem ) !== not;
		});

	}

	if ( qualifier.nodeType ) {
		return jQuery.grep( elements, function( elem ) {
			return ( elem === qualifier ) !== not;
		});

	}

	if ( typeof qualifier === "string" ) {
		if ( risSimple.test( qualifier ) ) {
			return jQuery.filter( qualifier, elements, not );
		}

		qualifier = jQuery.filter( qualifier, elements );
	}

	return jQuery.grep( elements, function( elem ) {
		return ( indexOf.call( qualifier, elem ) >= 0 ) !== not;
	});
}

jQuery.filter = function( expr, elems, not ) {
	var elem = elems[ 0 ];

	if ( not ) {
		expr = ":not(" + expr + ")";
	}

	return elems.length === 1 && elem.nodeType === 1 ?
		jQuery.find.matchesSelector( elem, expr ) ? [ elem ] : [] :
		jQuery.find.matches( expr, jQuery.grep( elems, function( elem ) {
			return elem.nodeType === 1;
		}));
};

jQuery.fn.extend({
	find: function( selector ) {
		var i,
			len = this.length,
			ret = [],
			self = this;

		if ( typeof selector !== "string" ) {
			return this.pushStack( jQuery( selector ).filter(function() {
				for ( i = 0; i < len; i++ ) {
					if ( jQuery.contains( self[ i ], this ) ) {
						return true;
					}
				}
			}) );
		}

		for ( i = 0; i < len; i++ ) {
			jQuery.find( selector, self[ i ], ret );
		}

		// Needed because $( selector, context ) becomes $( context ).find( selector )
		ret = this.pushStack( len > 1 ? jQuery.unique( ret ) : ret );
		ret.selector = this.selector ? this.selector + " " + selector : selector;
		return ret;
	},
	filter: function( selector ) {
		return this.pushStack( winnow(this, selector || [], false) );
	},
	not: function( selector ) {
		return this.pushStack( winnow(this, selector || [], true) );
	},
	is: function( selector ) {
		return !!winnow(
			this,

			// If this is a positional/relative selector, check membership in the returned set
			// so $("p:first").is("p:last") won't return true for a doc with two "p".
			typeof selector === "string" && rneedsContext.test( selector ) ?
				jQuery( selector ) :
				selector || [],
			false
		).length;
	}
});


// Initialize a jQuery object


// A central reference to the root jQuery(document)
var rootjQuery,

	// A simple way to check for HTML strings
	// Prioritize #id over <tag> to avoid XSS via location.hash (#9521)
	// Strict HTML recognition (#11290: must start with <)
	rquickExpr = /^(?:\s*(<[\w\W]+>)[^>]*|#([\w-]*))$/,

	init = jQuery.fn.init = function( selector, context ) {
		var match, elem;

		// HANDLE: $(""), $(null), $(undefined), $(false)
		if ( !selector ) {
			return this;
		}

		// Handle HTML strings
		if ( typeof selector === "string" ) {
			if ( selector[0] === "<" && selector[ selector.length - 1 ] === ">" && selector.length >= 3 ) {
				// Assume that strings that start and end with <> are HTML and skip the regex check
				match = [ null, selector, null ];

			} else {
				match = rquickExpr.exec( selector );
			}

			// Match html or make sure no context is specified for #id
			if ( match && (match[1] || !context) ) {

				// HANDLE: $(html) -> $(array)
				if ( match[1] ) {
					context = context instanceof jQuery ? context[0] : context;

					// scripts is true for back-compat
					// Intentionally let the error be thrown if parseHTML is not present
					jQuery.merge( this, jQuery.parseHTML(
						match[1],
						context && context.nodeType ? context.ownerDocument || context : document,
						true
					) );

					// HANDLE: $(html, props)
					if ( rsingleTag.test( match[1] ) && jQuery.isPlainObject( context ) ) {
						for ( match in context ) {
							// Properties of context are called as methods if possible
							if ( jQuery.isFunction( this[ match ] ) ) {
								this[ match ]( context[ match ] );

							// ...and otherwise set as attributes
							} else {
								this.attr( match, context[ match ] );
							}
						}
					}

					return this;

				// HANDLE: $(#id)
				} else {
					elem = document.getElementById( match[2] );

					// Check parentNode to catch when Blackberry 4.6 returns
					// nodes that are no longer in the document #6963
					if ( elem && elem.parentNode ) {
						// Inject the element directly into the jQuery object
						this.length = 1;
						this[0] = elem;
					}

					this.context = document;
					this.selector = selector;
					return this;
				}

			// HANDLE: $(expr, $(...))
			} else if ( !context || context.jquery ) {
				return ( context || rootjQuery ).find( selector );

			// HANDLE: $(expr, context)
			// (which is just equivalent to: $(context).find(expr)
			} else {
				return this.constructor( context ).find( selector );
			}

		// HANDLE: $(DOMElement)
		} else if ( selector.nodeType ) {
			this.context = this[0] = selector;
			this.length = 1;
			return this;

		// HANDLE: $(function)
		// Shortcut for document ready
		} else if ( jQuery.isFunction( selector ) ) {
			return typeof rootjQuery.ready !== "undefined" ?
				rootjQuery.ready( selector ) :
				// Execute immediately if ready is not present
				selector( jQuery );
		}

		if ( selector.selector !== undefined ) {
			this.selector = selector.selector;
			this.context = selector.context;
		}

		return jQuery.makeArray( selector, this );
	};

// Give the init function the jQuery prototype for later instantiation
init.prototype = jQuery.fn;

// Initialize central reference
rootjQuery = jQuery( document );


var rparentsprev = /^(?:parents|prev(?:Until|All))/,
	// methods guaranteed to produce a unique set when starting from a unique set
	guaranteedUnique = {
		children: true,
		contents: true,
		next: true,
		prev: true
	};

jQuery.extend({
	dir: function( elem, dir, until ) {
		var matched = [],
			truncate = until !== undefined;

		while ( (elem = elem[ dir ]) && elem.nodeType !== 9 ) {
			if ( elem.nodeType === 1 ) {
				if ( truncate && jQuery( elem ).is( until ) ) {
					break;
				}
				matched.push( elem );
			}
		}
		return matched;
	},

	sibling: function( n, elem ) {
		var matched = [];

		for ( ; n; n = n.nextSibling ) {
			if ( n.nodeType === 1 && n !== elem ) {
				matched.push( n );
			}
		}

		return matched;
	}
});

jQuery.fn.extend({
	has: function( target ) {
		var targets = jQuery( target, this ),
			l = targets.length;

		return this.filter(function() {
			var i = 0;
			for ( ; i < l; i++ ) {
				if ( jQuery.contains( this, targets[i] ) ) {
					return true;
				}
			}
		});
	},

	closest: function( selectors, context ) {
		var cur,
			i = 0,
			l = this.length,
			matched = [],
			pos = rneedsContext.test( selectors ) || typeof selectors !== "string" ?
				jQuery( selectors, context || this.context ) :
				0;

		for ( ; i < l; i++ ) {
			for ( cur = this[i]; cur && cur !== context; cur = cur.parentNode ) {
				// Always skip document fragments
				if ( cur.nodeType < 11 && (pos ?
					pos.index(cur) > -1 :

					// Don't pass non-elements to Sizzle
					cur.nodeType === 1 &&
						jQuery.find.matchesSelector(cur, selectors)) ) {

					matched.push( cur );
					break;
				}
			}
		}

		return this.pushStack( matched.length > 1 ? jQuery.unique( matched ) : matched );
	},

	// Determine the position of an element within
	// the matched set of elements
	index: function( elem ) {

		// No argument, return index in parent
		if ( !elem ) {
			return ( this[ 0 ] && this[ 0 ].parentNode ) ? this.first().prevAll().length : -1;
		}

		// index in selector
		if ( typeof elem === "string" ) {
			return indexOf.call( jQuery( elem ), this[ 0 ] );
		}

		// Locate the position of the desired element
		return indexOf.call( this,

			// If it receives a jQuery object, the first element is used
			elem.jquery ? elem[ 0 ] : elem
		);
	},

	add: function( selector, context ) {
		return this.pushStack(
			jQuery.unique(
				jQuery.merge( this.get(), jQuery( selector, context ) )
			)
		);
	},

	addBack: function( selector ) {
		return this.add( selector == null ?
			this.prevObject : this.prevObject.filter(selector)
		);
	}
});

function sibling( cur, dir ) {
	while ( (cur = cur[dir]) && cur.nodeType !== 1 ) {}
	return cur;
}

jQuery.each({
	parent: function( elem ) {
		var parent = elem.parentNode;
		return parent && parent.nodeType !== 11 ? parent : null;
	},
	parents: function( elem ) {
		return jQuery.dir( elem, "parentNode" );
	},
	parentsUntil: function( elem, i, until ) {
		return jQuery.dir( elem, "parentNode", until );
	},
	next: function( elem ) {
		return sibling( elem, "nextSibling" );
	},
	prev: function( elem ) {
		return sibling( elem, "previousSibling" );
	},
	nextAll: function( elem ) {
		return jQuery.dir( elem, "nextSibling" );
	},
	prevAll: function( elem ) {
		return jQuery.dir( elem, "previousSibling" );
	},
	nextUntil: function( elem, i, until ) {
		return jQuery.dir( elem, "nextSibling", until );
	},
	prevUntil: function( elem, i, until ) {
		return jQuery.dir( elem, "previousSibling", until );
	},
	siblings: function( elem ) {
		return jQuery.sibling( ( elem.parentNode || {} ).firstChild, elem );
	},
	children: function( elem ) {
		return jQuery.sibling( elem.firstChild );
	},
	contents: function( elem ) {
		return elem.contentDocument || jQuery.merge( [], elem.childNodes );
	}
}, function( name, fn ) {
	jQuery.fn[ name ] = function( until, selector ) {
		var matched = jQuery.map( this, fn, until );

		if ( name.slice( -5 ) !== "Until" ) {
			selector = until;
		}

		if ( selector && typeof selector === "string" ) {
			matched = jQuery.filter( selector, matched );
		}

		if ( this.length > 1 ) {
			// Remove duplicates
			if ( !guaranteedUnique[ name ] ) {
				jQuery.unique( matched );
			}

			// Reverse order for parents* and prev-derivatives
			if ( rparentsprev.test( name ) ) {
				matched.reverse();
			}
		}

		return this.pushStack( matched );
	};
});
var rnotwhite = (/\S+/g);



// String to Object options format cache
var optionsCache = {};

// Convert String-formatted options into Object-formatted ones and store in cache
function createOptions( options ) {
	var object = optionsCache[ options ] = {};
	jQuery.each( options.match( rnotwhite ) || [], function( _, flag ) {
		object[ flag ] = true;
	});
	return object;
}

/*
 * Create a callback list using the following parameters:
 *
 *	options: an optional list of space-separated options that will change how
 *			the callback list behaves or a more traditional option object
 *
 * By default a callback list will act like an event callback list and can be
 * "fired" multiple times.
 *
 * Possible options:
 *
 *	once:			will ensure the callback list can only be fired once (like a Deferred)
 *
 *	memory:			will keep track of previous values and will call any callback added
 *					after the list has been fired right away with the latest "memorized"
 *					values (like a Deferred)
 *
 *	unique:			will ensure a callback can only be added once (no duplicate in the list)
 *
 *	stopOnFalse:	interrupt callings when a callback returns false
 *
 */
jQuery.Callbacks = function( options ) {

	// Convert options from String-formatted to Object-formatted if needed
	// (we check in cache first)
	options = typeof options === "string" ?
		( optionsCache[ options ] || createOptions( options ) ) :
		jQuery.extend( {}, options );

	var // Last fire value (for non-forgettable lists)
		memory,
		// Flag to know if list was already fired
		fired,
		// Flag to know if list is currently firing
		firing,
		// First callback to fire (used internally by add and fireWith)
		firingStart,
		// End of the loop when firing
		firingLength,
		// Index of currently firing callback (modified by remove if needed)
		firingIndex,
		// Actual callback list
		list = [],
		// Stack of fire calls for repeatable lists
		stack = !options.once && [],
		// Fire callbacks
		fire = function( data ) {
			memory = options.memory && data;
			fired = true;
			firingIndex = firingStart || 0;
			firingStart = 0;
			firingLength = list.length;
			firing = true;
			for ( ; list && firingIndex < firingLength; firingIndex++ ) {
				if ( list[ firingIndex ].apply( data[ 0 ], data[ 1 ] ) === false && options.stopOnFalse ) {
					memory = false; // To prevent further calls using add
					break;
				}
			}
			firing = false;
			if ( list ) {
				if ( stack ) {
					if ( stack.length ) {
						fire( stack.shift() );
					}
				} else if ( memory ) {
					list = [];
				} else {
					self.disable();
				}
			}
		},
		// Actual Callbacks object
		self = {
			// Add a callback or a collection of callbacks to the list
			add: function() {
				if ( list ) {
					// First, we save the current length
					var start = list.length;
					(function add( args ) {
						jQuery.each( args, function( _, arg ) {
							var type = jQuery.type( arg );
							if ( type === "function" ) {
								if ( !options.unique || !self.has( arg ) ) {
									list.push( arg );
								}
							} else if ( arg && arg.length && type !== "string" ) {
								// Inspect recursively
								add( arg );
							}
						});
					})( arguments );
					// Do we need to add the callbacks to the
					// current firing batch?
					if ( firing ) {
						firingLength = list.length;
					// With memory, if we're not firing then
					// we should call right away
					} else if ( memory ) {
						firingStart = start;
						fire( memory );
					}
				}
				return this;
			},
			// Remove a callback from the list
			remove: function() {
				if ( list ) {
					jQuery.each( arguments, function( _, arg ) {
						var index;
						while ( ( index = jQuery.inArray( arg, list, index ) ) > -1 ) {
							list.splice( index, 1 );
							// Handle firing indexes
							if ( firing ) {
								if ( index <= firingLength ) {
									firingLength--;
								}
								if ( index <= firingIndex ) {
									firingIndex--;
								}
							}
						}
					});
				}
				return this;
			},
			// Check if a given callback is in the list.
			// If no argument is given, return whether or not list has callbacks attached.
			has: function( fn ) {
				return fn ? jQuery.inArray( fn, list ) > -1 : !!( list && list.length );
			},
			// Remove all callbacks from the list
			empty: function() {
				list = [];
				firingLength = 0;
				return this;
			},
			// Have the list do nothing anymore
			disable: function() {
				list = stack = memory = undefined;
				return this;
			},
			// Is it disabled?
			disabled: function() {
				return !list;
			},
			// Lock the list in its current state
			lock: function() {
				stack = undefined;
				if ( !memory ) {
					self.disable();
				}
				return this;
			},
			// Is it locked?
			locked: function() {
				return !stack;
			},
			// Call all callbacks with the given context and arguments
			fireWith: function( context, args ) {
				if ( list && ( !fired || stack ) ) {
					args = args || [];
					args = [ context, args.slice ? args.slice() : args ];
					if ( firing ) {
						stack.push( args );
					} else {
						fire( args );
					}
				}
				return this;
			},
			// Call all the callbacks with the given arguments
			fire: function() {
				self.fireWith( this, arguments );
				return this;
			},
			// To know if the callbacks have already been called at least once
			fired: function() {
				return !!fired;
			}
		};

	return self;
};


jQuery.extend({

	Deferred: function( func ) {
		var tuples = [
				// action, add listener, listener list, final state
				[ "resolve", "done", jQuery.Callbacks("once memory"), "resolved" ],
				[ "reject", "fail", jQuery.Callbacks("once memory"), "rejected" ],
				[ "notify", "progress", jQuery.Callbacks("memory") ]
			],
			state = "pending",
			promise = {
				state: function() {
					return state;
				},
				always: function() {
					deferred.done( arguments ).fail( arguments );
					return this;
				},
				then: function( /* fnDone, fnFail, fnProgress */ ) {
					var fns = arguments;
					return jQuery.Deferred(function( newDefer ) {
						jQuery.each( tuples, function( i, tuple ) {
							var fn = jQuery.isFunction( fns[ i ] ) && fns[ i ];
							// deferred[ done | fail | progress ] for forwarding actions to newDefer
							deferred[ tuple[1] ](function() {
								var returned = fn && fn.apply( this, arguments );
								if ( returned && jQuery.isFunction( returned.promise ) ) {
									returned.promise()
										.done( newDefer.resolve )
										.fail( newDefer.reject )
										.progress( newDefer.notify );
								} else {
									newDefer[ tuple[ 0 ] + "With" ]( this === promise ? newDefer.promise() : this, fn ? [ returned ] : arguments );
								}
							});
						});
						fns = null;
					}).promise();
				},
				// Get a promise for this deferred
				// If obj is provided, the promise aspect is added to the object
				promise: function( obj ) {
					return obj != null ? jQuery.extend( obj, promise ) : promise;
				}
			},
			deferred = {};

		// Keep pipe for back-compat
		promise.pipe = promise.then;

		// Add list-specific methods
		jQuery.each( tuples, function( i, tuple ) {
			var list = tuple[ 2 ],
				stateString = tuple[ 3 ];

			// promise[ done | fail | progress ] = list.add
			promise[ tuple[1] ] = list.add;

			// Handle state
			if ( stateString ) {
				list.add(function() {
					// state = [ resolved | rejected ]
					state = stateString;

				// [ reject_list | resolve_list ].disable; progress_list.lock
				}, tuples[ i ^ 1 ][ 2 ].disable, tuples[ 2 ][ 2 ].lock );
			}

			// deferred[ resolve | reject | notify ]
			deferred[ tuple[0] ] = function() {
				deferred[ tuple[0] + "With" ]( this === deferred ? promise : this, arguments );
				return this;
			};
			deferred[ tuple[0] + "With" ] = list.fireWith;
		});

		// Make the deferred a promise
		promise.promise( deferred );

		// Call given func if any
		if ( func ) {
			func.call( deferred, deferred );
		}

		// All done!
		return deferred;
	},

	// Deferred helper
	when: function( subordinate /* , ..., subordinateN */ ) {
		var i = 0,
			resolveValues = slice.call( arguments ),
			length = resolveValues.length,

			// the count of uncompleted subordinates
			remaining = length !== 1 || ( subordinate && jQuery.isFunction( subordinate.promise ) ) ? length : 0,

			// the master Deferred. If resolveValues consist of only a single Deferred, just use that.
			deferred = remaining === 1 ? subordinate : jQuery.Deferred(),

			// Update function for both resolve and progress values
			updateFunc = function( i, contexts, values ) {
				return function( value ) {
					contexts[ i ] = this;
					values[ i ] = arguments.length > 1 ? slice.call( arguments ) : value;
					if ( values === progressValues ) {
						deferred.notifyWith( contexts, values );
					} else if ( !( --remaining ) ) {
						deferred.resolveWith( contexts, values );
					}
				};
			},

			progressValues, progressContexts, resolveContexts;

		// add listeners to Deferred subordinates; treat others as resolved
		if ( length > 1 ) {
			progressValues = new Array( length );
			progressContexts = new Array( length );
			resolveContexts = new Array( length );
			for ( ; i < length; i++ ) {
				if ( resolveValues[ i ] && jQuery.isFunction( resolveValues[ i ].promise ) ) {
					resolveValues[ i ].promise()
						.done( updateFunc( i, resolveContexts, resolveValues ) )
						.fail( deferred.reject )
						.progress( updateFunc( i, progressContexts, progressValues ) );
				} else {
					--remaining;
				}
			}
		}

		// if we're not waiting on anything, resolve the master
		if ( !remaining ) {
			deferred.resolveWith( resolveContexts, resolveValues );
		}

		return deferred.promise();
	}
});


// The deferred used on DOM ready
var readyList;

jQuery.fn.ready = function( fn ) {
	// Add the callback
	jQuery.ready.promise().done( fn );

	return this;
};

jQuery.extend({
	// Is the DOM ready to be used? Set to true once it occurs.
	isReady: false,

	// A counter to track how many items to wait for before
	// the ready event fires. See #6781
	readyWait: 1,

	// Hold (or release) the ready event
	holdReady: function( hold ) {
		if ( hold ) {
			jQuery.readyWait++;
		} else {
			jQuery.ready( true );
		}
	},

	// Handle when the DOM is ready
	ready: function( wait ) {

		// Abort if there are pending holds or we're already ready
		if ( wait === true ? --jQuery.readyWait : jQuery.isReady ) {
			return;
		}

		// Remember that the DOM is ready
		jQuery.isReady = true;

		// If a normal DOM Ready event fired, decrement, and wait if need be
		if ( wait !== true && --jQuery.readyWait > 0 ) {
			return;
		}

		// If there are functions bound, to execute
		readyList.resolveWith( document, [ jQuery ] );

		// Trigger any bound ready events
		if ( jQuery.fn.triggerHandler ) {
			jQuery( document ).triggerHandler( "ready" );
			jQuery( document ).off( "ready" );
		}
	}
});

/**
 * The ready event handler and self cleanup method
 */
function completed() {
	document.removeEventListener( "DOMContentLoaded", completed, false );
	window.removeEventListener( "load", completed, false );
	jQuery.ready();
}

jQuery.ready.promise = function( obj ) {
	if ( !readyList ) {

		readyList = jQuery.Deferred();

		// Catch cases where $(document).ready() is called after the browser event has already occurred.
		// we once tried to use readyState "interactive" here, but it caused issues like the one
		// discovered by ChrisS here: http://bugs.jquery.com/ticket/12282#comment:15
		if ( document.readyState === "complete" ) {
			// Handle it asynchronously to allow scripts the opportunity to delay ready
			setTimeout( jQuery.ready );

		} else {

			// Use the handy event callback
			document.addEventListener( "DOMContentLoaded", completed, false );

			// A fallback to window.onload, that will always work
			window.addEventListener( "load", completed, false );
		}
	}
	return readyList.promise( obj );
};

// Kick off the DOM ready check even if the user does not
jQuery.ready.promise();




// Multifunctional method to get and set values of a collection
// The value/s can optionally be executed if it's a function
var access = jQuery.access = function( elems, fn, key, value, chainable, emptyGet, raw ) {
	var i = 0,
		len = elems.length,
		bulk = key == null;

	// Sets many values
	if ( jQuery.type( key ) === "object" ) {
		chainable = true;
		for ( i in key ) {
			jQuery.access( elems, fn, i, key[i], true, emptyGet, raw );
		}

	// Sets one value
	} else if ( value !== undefined ) {
		chainable = true;

		if ( !jQuery.isFunction( value ) ) {
			raw = true;
		}

		if ( bulk ) {
			// Bulk operations run against the entire set
			if ( raw ) {
				fn.call( elems, value );
				fn = null;

			// ...except when executing function values
			} else {
				bulk = fn;
				fn = function( elem, key, value ) {
					return bulk.call( jQuery( elem ), value );
				};
			}
		}

		if ( fn ) {
			for ( ; i < len; i++ ) {
				fn( elems[i], key, raw ? value : value.call( elems[i], i, fn( elems[i], key ) ) );
			}
		}
	}

	return chainable ?
		elems :

		// Gets
		bulk ?
			fn.call( elems ) :
			len ? fn( elems[0], key ) : emptyGet;
};


/**
 * Determines whether an object can have data
 */
jQuery.acceptData = function( owner ) {
	// Accepts only:
	//  - Node
	//    - Node.ELEMENT_NODE
	//    - Node.DOCUMENT_NODE
	//  - Object
	//    - Any
	/* jshint -W018 */
	return owner.nodeType === 1 || owner.nodeType === 9 || !( +owner.nodeType );
};


function Data() {
	// Support: Android < 4,
	// Old WebKit does not have Object.preventExtensions/freeze method,
	// return new empty object instead with no [[set]] accessor
	Object.defineProperty( this.cache = {}, 0, {
		get: function() {
			return {};
		}
	});

	this.expando = jQuery.expando + Math.random();
}

Data.uid = 1;
Data.accepts = jQuery.acceptData;

Data.prototype = {
	key: function( owner ) {
		// We can accept data for non-element nodes in modern browsers,
		// but we should not, see #8335.
		// Always return the key for a frozen object.
		if ( !Data.accepts( owner ) ) {
			return 0;
		}

		var descriptor = {},
			// Check if the owner object already has a cache key
			unlock = owner[ this.expando ];

		// If not, create one
		if ( !unlock ) {
			unlock = Data.uid++;

			// Secure it in a non-enumerable, non-writable property
			try {
				descriptor[ this.expando ] = { value: unlock };
				Object.defineProperties( owner, descriptor );

			// Support: Android < 4
			// Fallback to a less secure definition
			} catch ( e ) {
				descriptor[ this.expando ] = unlock;
				jQuery.extend( owner, descriptor );
			}
		}

		// Ensure the cache object
		if ( !this.cache[ unlock ] ) {
			this.cache[ unlock ] = {};
		}

		return unlock;
	},
	set: function( owner, data, value ) {
		var prop,
			// There may be an unlock assigned to this node,
			// if there is no entry for this "owner", create one inline
			// and set the unlock as though an owner entry had always existed
			unlock = this.key( owner ),
			cache = this.cache[ unlock ];

		// Handle: [ owner, key, value ] args
		if ( typeof data === "string" ) {
			cache[ data ] = value;

		// Handle: [ owner, { properties } ] args
		} else {
			// Fresh assignments by object are shallow copied
			if ( jQuery.isEmptyObject( cache ) ) {
				jQuery.extend( this.cache[ unlock ], data );
			// Otherwise, copy the properties one-by-one to the cache object
			} else {
				for ( prop in data ) {
					cache[ prop ] = data[ prop ];
				}
			}
		}
		return cache;
	},
	get: function( owner, key ) {
		// Either a valid cache is found, or will be created.
		// New caches will be created and the unlock returned,
		// allowing direct access to the newly created
		// empty data object. A valid owner object must be provided.
		var cache = this.cache[ this.key( owner ) ];

		return key === undefined ?
			cache : cache[ key ];
	},
	access: function( owner, key, value ) {
		var stored;
		// In cases where either:
		//
		//   1. No key was specified
		//   2. A string key was specified, but no value provided
		//
		// Take the "read" path and allow the get method to determine
		// which value to return, respectively either:
		//
		//   1. The entire cache object
		//   2. The data stored at the key
		//
		if ( key === undefined ||
				((key && typeof key === "string") && value === undefined) ) {

			stored = this.get( owner, key );

			return stored !== undefined ?
				stored : this.get( owner, jQuery.camelCase(key) );
		}

		// [*]When the key is not a string, or both a key and value
		// are specified, set or extend (existing objects) with either:
		//
		//   1. An object of properties
		//   2. A key and value
		//
		this.set( owner, key, value );

		// Since the "set" path can have two possible entry points
		// return the expected data based on which path was taken[*]
		return value !== undefined ? value : key;
	},
	remove: function( owner, key ) {
		var i, name, camel,
			unlock = this.key( owner ),
			cache = this.cache[ unlock ];

		if ( key === undefined ) {
			this.cache[ unlock ] = {};

		} else {
			// Support array or space separated string of keys
			if ( jQuery.isArray( key ) ) {
				// If "name" is an array of keys...
				// When data is initially created, via ("key", "val") signature,
				// keys will be converted to camelCase.
				// Since there is no way to tell _how_ a key was added, remove
				// both plain key and camelCase key. #12786
				// This will only penalize the array argument path.
				name = key.concat( key.map( jQuery.camelCase ) );
			} else {
				camel = jQuery.camelCase( key );
				// Try the string as a key before any manipulation
				if ( key in cache ) {
					name = [ key, camel ];
				} else {
					// If a key with the spaces exists, use it.
					// Otherwise, create an array by matching non-whitespace
					name = camel;
					name = name in cache ?
						[ name ] : ( name.match( rnotwhite ) || [] );
				}
			}

			i = name.length;
			while ( i-- ) {
				delete cache[ name[ i ] ];
			}
		}
	},
	hasData: function( owner ) {
		return !jQuery.isEmptyObject(
			this.cache[ owner[ this.expando ] ] || {}
		);
	},
	discard: function( owner ) {
		if ( owner[ this.expando ] ) {
			delete this.cache[ owner[ this.expando ] ];
		}
	}
};
var data_priv = new Data();

var data_user = new Data();



/*
	Implementation Summary

	1. Enforce API surface and semantic compatibility with 1.9.x branch
	2. Improve the module's maintainability by reducing the storage
		paths to a single mechanism.
	3. Use the same single mechanism to support "private" and "user" data.
	4. _Never_ expose "private" data to user code (TODO: Drop _data, _removeData)
	5. Avoid exposing implementation details on user objects (eg. expando properties)
	6. Provide a clear path for implementation upgrade to WeakMap in 2014
*/
var rbrace = /^(?:\{[\w\W]*\}|\[[\w\W]*\])$/,
	rmultiDash = /([A-Z])/g;

function dataAttr( elem, key, data ) {
	var name;

	// If nothing was found internally, try to fetch any
	// data from the HTML5 data-* attribute
	if ( data === undefined && elem.nodeType === 1 ) {
		name = "data-" + key.replace( rmultiDash, "-$1" ).toLowerCase();
		data = elem.getAttribute( name );

		if ( typeof data === "string" ) {
			try {
				data = data === "true" ? true :
					data === "false" ? false :
					data === "null" ? null :
					// Only convert to a number if it doesn't change the string
					+data + "" === data ? +data :
					rbrace.test( data ) ? jQuery.parseJSON( data ) :
					data;
			} catch( e ) {}

			// Make sure we set the data so it isn't changed later
			data_user.set( elem, key, data );
		} else {
			data = undefined;
		}
	}
	return data;
}

jQuery.extend({
	hasData: function( elem ) {
		return data_user.hasData( elem ) || data_priv.hasData( elem );
	},

	data: function( elem, name, data ) {
		return data_user.access( elem, name, data );
	},

	removeData: function( elem, name ) {
		data_user.remove( elem, name );
	},

	// TODO: Now that all calls to _data and _removeData have been replaced
	// with direct calls to data_priv methods, these can be deprecated.
	_data: function( elem, name, data ) {
		return data_priv.access( elem, name, data );
	},

	_removeData: function( elem, name ) {
		data_priv.remove( elem, name );
	}
});

jQuery.fn.extend({
	data: function( key, value ) {
		var i, name, data,
			elem = this[ 0 ],
			attrs = elem && elem.attributes;

		// Gets all values
		if ( key === undefined ) {
			if ( this.length ) {
				data = data_user.get( elem );

				if ( elem.nodeType === 1 && !data_priv.get( elem, "hasDataAttrs" ) ) {
					i = attrs.length;
					while ( i-- ) {

						// Support: IE11+
						// The attrs elements can be null (#14894)
						if ( attrs[ i ] ) {
							name = attrs[ i ].name;
							if ( name.indexOf( "data-" ) === 0 ) {
								name = jQuery.camelCase( name.slice(5) );
								dataAttr( elem, name, data[ name ] );
							}
						}
					}
					data_priv.set( elem, "hasDataAttrs", true );
				}
			}

			return data;
		}

		// Sets multiple values
		if ( typeof key === "object" ) {
			return this.each(function() {
				data_user.set( this, key );
			});
		}

		return access( this, function( value ) {
			var data,
				camelKey = jQuery.camelCase( key );

			// The calling jQuery object (element matches) is not empty
			// (and therefore has an element appears at this[ 0 ]) and the
			// `value` parameter was not undefined. An empty jQuery object
			// will result in `undefined` for elem = this[ 0 ] which will
			// throw an exception if an attempt to read a data cache is made.
			if ( elem && value === undefined ) {
				// Attempt to get data from the cache
				// with the key as-is
				data = data_user.get( elem, key );
				if ( data !== undefined ) {
					return data;
				}

				// Attempt to get data from the cache
				// with the key camelized
				data = data_user.get( elem, camelKey );
				if ( data !== undefined ) {
					return data;
				}

				// Attempt to "discover" the data in
				// HTML5 custom data-* attrs
				data = dataAttr( elem, camelKey, undefined );
				if ( data !== undefined ) {
					return data;
				}

				// We tried really hard, but the data doesn't exist.
				return;
			}

			// Set the data...
			this.each(function() {
				// First, attempt to store a copy or reference of any
				// data that might've been store with a camelCased key.
				var data = data_user.get( this, camelKey );

				// For HTML5 data-* attribute interop, we have to
				// store property names with dashes in a camelCase form.
				// This might not apply to all properties...*
				data_user.set( this, camelKey, value );

				// *... In the case of properties that might _actually_
				// have dashes, we need to also store a copy of that
				// unchanged property.
				if ( key.indexOf("-") !== -1 && data !== undefined ) {
					data_user.set( this, key, value );
				}
			});
		}, null, value, arguments.length > 1, null, true );
	},

	removeData: function( key ) {
		return this.each(function() {
			data_user.remove( this, key );
		});
	}
});


jQuery.extend({
	queue: function( elem, type, data ) {
		var queue;

		if ( elem ) {
			type = ( type || "fx" ) + "queue";
			queue = data_priv.get( elem, type );

			// Speed up dequeue by getting out quickly if this is just a lookup
			if ( data ) {
				if ( !queue || jQuery.isArray( data ) ) {
					queue = data_priv.access( elem, type, jQuery.makeArray(data) );
				} else {
					queue.push( data );
				}
			}
			return queue || [];
		}
	},

	dequeue: function( elem, type ) {
		type = type || "fx";

		var queue = jQuery.queue( elem, type ),
			startLength = queue.length,
			fn = queue.shift(),
			hooks = jQuery._queueHooks( elem, type ),
			next = function() {
				jQuery.dequeue( elem, type );
			};

		// If the fx queue is dequeued, always remove the progress sentinel
		if ( fn === "inprogress" ) {
			fn = queue.shift();
			startLength--;
		}

		if ( fn ) {

			// Add a progress sentinel to prevent the fx queue from being
			// automatically dequeued
			if ( type === "fx" ) {
				queue.unshift( "inprogress" );
			}

			// clear up the last queue stop function
			delete hooks.stop;
			fn.call( elem, next, hooks );
		}

		if ( !startLength && hooks ) {
			hooks.empty.fire();
		}
	},

	// not intended for public consumption - generates a queueHooks object, or returns the current one
	_queueHooks: function( elem, type ) {
		var key = type + "queueHooks";
		return data_priv.get( elem, key ) || data_priv.access( elem, key, {
			empty: jQuery.Callbacks("once memory").add(function() {
				data_priv.remove( elem, [ type + "queue", key ] );
			})
		});
	}
});

jQuery.fn.extend({
	queue: function( type, data ) {
		var setter = 2;

		if ( typeof type !== "string" ) {
			data = type;
			type = "fx";
			setter--;
		}

		if ( arguments.length < setter ) {
			return jQuery.queue( this[0], type );
		}

		return data === undefined ?
			this :
			this.each(function() {
				var queue = jQuery.queue( this, type, data );

				// ensure a hooks for this queue
				jQuery._queueHooks( this, type );

				if ( type === "fx" && queue[0] !== "inprogress" ) {
					jQuery.dequeue( this, type );
				}
			});
	},
	dequeue: function( type ) {
		return this.each(function() {
			jQuery.dequeue( this, type );
		});
	},
	clearQueue: function( type ) {
		return this.queue( type || "fx", [] );
	},
	// Get a promise resolved when queues of a certain type
	// are emptied (fx is the type by default)
	promise: function( type, obj ) {
		var tmp,
			count = 1,
			defer = jQuery.Deferred(),
			elements = this,
			i = this.length,
			resolve = function() {
				if ( !( --count ) ) {
					defer.resolveWith( elements, [ elements ] );
				}
			};

		if ( typeof type !== "string" ) {
			obj = type;
			type = undefined;
		}
		type = type || "fx";

		while ( i-- ) {
			tmp = data_priv.get( elements[ i ], type + "queueHooks" );
			if ( tmp && tmp.empty ) {
				count++;
				tmp.empty.add( resolve );
			}
		}
		resolve();
		return defer.promise( obj );
	}
});
var pnum = (/[+-]?(?:\d*\.|)\d+(?:[eE][+-]?\d+|)/).source;

var cssExpand = [ "Top", "Right", "Bottom", "Left" ];

var isHidden = function( elem, el ) {
		// isHidden might be called from jQuery#filter function;
		// in that case, element will be second argument
		elem = el || elem;
		return jQuery.css( elem, "display" ) === "none" || !jQuery.contains( elem.ownerDocument, elem );
	};

var rcheckableType = (/^(?:checkbox|radio)$/i);



(function() {
	var fragment = document.createDocumentFragment(),
		div = fragment.appendChild( document.createElement( "div" ) ),
		input = document.createElement( "input" );

	// #11217 - WebKit loses check when the name is after the checked attribute
	// Support: Windows Web Apps (WWA)
	// `name` and `type` need .setAttribute for WWA
	input.setAttribute( "type", "radio" );
	input.setAttribute( "checked", "checked" );
	input.setAttribute( "name", "t" );

	div.appendChild( input );

	// Support: Safari 5.1, iOS 5.1, Android 4.x, Android 2.3
	// old WebKit doesn't clone checked state correctly in fragments
	support.checkClone = div.cloneNode( true ).cloneNode( true ).lastChild.checked;

	// Make sure textarea (and checkbox) defaultValue is properly cloned
	// Support: IE9-IE11+
	div.innerHTML = "<textarea>x</textarea>";
	support.noCloneChecked = !!div.cloneNode( true ).lastChild.defaultValue;
})();
var strundefined = typeof undefined;



support.focusinBubbles = "onfocusin" in window;


var
	rkeyEvent = /^key/,
	rmouseEvent = /^(?:mouse|pointer|contextmenu)|click/,
	rfocusMorph = /^(?:focusinfocus|focusoutblur)$/,
	rtypenamespace = /^([^.]*)(?:\.(.+)|)$/;

function returnTrue() {
	return true;
}

function returnFalse() {
	return false;
}

function safeActiveElement() {
	try {
		return document.activeElement;
	} catch ( err ) { }
}

/*
 * Helper functions for managing events -- not part of the public interface.
 * Props to Dean Edwards' addEvent library for many of the ideas.
 */
jQuery.event = {

	global: {},

	add: function( elem, types, handler, data, selector ) {

		var handleObjIn, eventHandle, tmp,
			events, t, handleObj,
			special, handlers, type, namespaces, origType,
			elemData = data_priv.get( elem );

		// Don't attach events to noData or text/comment nodes (but allow plain objects)
		if ( !elemData ) {
			return;
		}

		// Caller can pass in an object of custom data in lieu of the handler
		if ( handler.handler ) {
			handleObjIn = handler;
			handler = handleObjIn.handler;
			selector = handleObjIn.selector;
		}

		// Make sure that the handler has a unique ID, used to find/remove it later
		if ( !handler.guid ) {
			handler.guid = jQuery.guid++;
		}

		// Init the element's event structure and main handler, if this is the first
		if ( !(events = elemData.events) ) {
			events = elemData.events = {};
		}
		if ( !(eventHandle = elemData.handle) ) {
			eventHandle = elemData.handle = function( e ) {
				// Discard the second event of a jQuery.event.trigger() and
				// when an event is called after a page has unloaded
				return typeof jQuery !== strundefined && jQuery.event.triggered !== e.type ?
					jQuery.event.dispatch.apply( elem, arguments ) : undefined;
			};
		}

		// Handle multiple events separated by a space
		types = ( types || "" ).match( rnotwhite ) || [ "" ];
		t = types.length;
		while ( t-- ) {
			tmp = rtypenamespace.exec( types[t] ) || [];
			type = origType = tmp[1];
			namespaces = ( tmp[2] || "" ).split( "." ).sort();

			// There *must* be a type, no attaching namespace-only handlers
			if ( !type ) {
				continue;
			}

			// If event changes its type, use the special event handlers for the changed type
			special = jQuery.event.special[ type ] || {};

			// If selector defined, determine special event api type, otherwise given type
			type = ( selector ? special.delegateType : special.bindType ) || type;

			// Update special based on newly reset type
			special = jQuery.event.special[ type ] || {};

			// handleObj is passed to all event handlers
			handleObj = jQuery.extend({
				type: type,
				origType: origType,
				data: data,
				handler: handler,
				guid: handler.guid,
				selector: selector,
				needsContext: selector && jQuery.expr.match.needsContext.test( selector ),
				namespace: namespaces.join(".")
			}, handleObjIn );

			// Init the event handler queue if we're the first
			if ( !(handlers = events[ type ]) ) {
				handlers = events[ type ] = [];
				handlers.delegateCount = 0;

				// Only use addEventListener if the special events handler returns false
				if ( !special.setup || special.setup.call( elem, data, namespaces, eventHandle ) === false ) {
					if ( elem.addEventListener ) {
						elem.addEventListener( type, eventHandle, false );
					}
				}
			}

			if ( special.add ) {
				special.add.call( elem, handleObj );

				if ( !handleObj.handler.guid ) {
					handleObj.handler.guid = handler.guid;
				}
			}

			// Add to the element's handler list, delegates in front
			if ( selector ) {
				handlers.splice( handlers.delegateCount++, 0, handleObj );
			} else {
				handlers.push( handleObj );
			}

			// Keep track of which events have ever been used, for event optimization
			jQuery.event.global[ type ] = true;
		}

	},

	// Detach an event or set of events from an element
	remove: function( elem, types, handler, selector, mappedTypes ) {

		var j, origCount, tmp,
			events, t, handleObj,
			special, handlers, type, namespaces, origType,
			elemData = data_priv.hasData( elem ) && data_priv.get( elem );

		if ( !elemData || !(events = elemData.events) ) {
			return;
		}

		// Once for each type.namespace in types; type may be omitted
		types = ( types || "" ).match( rnotwhite ) || [ "" ];
		t = types.length;
		while ( t-- ) {
			tmp = rtypenamespace.exec( types[t] ) || [];
			type = origType = tmp[1];
			namespaces = ( tmp[2] || "" ).split( "." ).sort();

			// Unbind all events (on this namespace, if provided) for the element
			if ( !type ) {
				for ( type in events ) {
					jQuery.event.remove( elem, type + types[ t ], handler, selector, true );
				}
				continue;
			}

			special = jQuery.event.special[ type ] || {};
			type = ( selector ? special.delegateType : special.bindType ) || type;
			handlers = events[ type ] || [];
			tmp = tmp[2] && new RegExp( "(^|\\.)" + namespaces.join("\\.(?:.*\\.|)") + "(\\.|$)" );

			// Remove matching events
			origCount = j = handlers.length;
			while ( j-- ) {
				handleObj = handlers[ j ];

				if ( ( mappedTypes || origType === handleObj.origType ) &&
					( !handler || handler.guid === handleObj.guid ) &&
					( !tmp || tmp.test( handleObj.namespace ) ) &&
					( !selector || selector === handleObj.selector || selector === "**" && handleObj.selector ) ) {
					handlers.splice( j, 1 );

					if ( handleObj.selector ) {
						handlers.delegateCount--;
					}
					if ( special.remove ) {
						special.remove.call( elem, handleObj );
					}
				}
			}

			// Remove generic event handler if we removed something and no more handlers exist
			// (avoids potential for endless recursion during removal of special event handlers)
			if ( origCount && !handlers.length ) {
				if ( !special.teardown || special.teardown.call( elem, namespaces, elemData.handle ) === false ) {
					jQuery.removeEvent( elem, type, elemData.handle );
				}

				delete events[ type ];
			}
		}

		// Remove the expando if it's no longer used
		if ( jQuery.isEmptyObject( events ) ) {
			delete elemData.handle;
			data_priv.remove( elem, "events" );
		}
	},

	trigger: function( event, data, elem, onlyHandlers ) {

		var i, cur, tmp, bubbleType, ontype, handle, special,
			eventPath = [ elem || document ],
			type = hasOwn.call( event, "type" ) ? event.type : event,
			namespaces = hasOwn.call( event, "namespace" ) ? event.namespace.split(".") : [];

		cur = tmp = elem = elem || document;

		// Don't do events on text and comment nodes
		if ( elem.nodeType === 3 || elem.nodeType === 8 ) {
			return;
		}

		// focus/blur morphs to focusin/out; ensure we're not firing them right now
		if ( rfocusMorph.test( type + jQuery.event.triggered ) ) {
			return;
		}

		if ( type.indexOf(".") >= 0 ) {
			// Namespaced trigger; create a regexp to match event type in handle()
			namespaces = type.split(".");
			type = namespaces.shift();
			namespaces.sort();
		}
		ontype = type.indexOf(":") < 0 && "on" + type;

		// Caller can pass in a jQuery.Event object, Object, or just an event type string
		event = event[ jQuery.expando ] ?
			event :
			new jQuery.Event( type, typeof event === "object" && event );

		// Trigger bitmask: & 1 for native handlers; & 2 for jQuery (always true)
		event.isTrigger = onlyHandlers ? 2 : 3;
		event.namespace = namespaces.join(".");
		event.namespace_re = event.namespace ?
			new RegExp( "(^|\\.)" + namespaces.join("\\.(?:.*\\.|)") + "(\\.|$)" ) :
			null;

		// Clean up the event in case it is being reused
		event.result = undefined;
		if ( !event.target ) {
			event.target = elem;
		}

		// Clone any incoming data and prepend the event, creating the handler arg list
		data = data == null ?
			[ event ] :
			jQuery.makeArray( data, [ event ] );

		// Allow special events to draw outside the lines
		special = jQuery.event.special[ type ] || {};
		if ( !onlyHandlers && special.trigger && special.trigger.apply( elem, data ) === false ) {
			return;
		}

		// Determine event propagation path in advance, per W3C events spec (#9951)
		// Bubble up to document, then to window; watch for a global ownerDocument var (#9724)
		if ( !onlyHandlers && !special.noBubble && !jQuery.isWindow( elem ) ) {

			bubbleType = special.delegateType || type;
			if ( !rfocusMorph.test( bubbleType + type ) ) {
				cur = cur.parentNode;
			}
			for ( ; cur; cur = cur.parentNode ) {
				eventPath.push( cur );
				tmp = cur;
			}

			// Only add window if we got to document (e.g., not plain obj or detached DOM)
			if ( tmp === (elem.ownerDocument || document) ) {
				eventPath.push( tmp.defaultView || tmp.parentWindow || window );
			}
		}

		// Fire handlers on the event path
		i = 0;
		while ( (cur = eventPath[i++]) && !event.isPropagationStopped() ) {

			event.type = i > 1 ?
				bubbleType :
				special.bindType || type;

			// jQuery handler
			handle = ( data_priv.get( cur, "events" ) || {} )[ event.type ] && data_priv.get( cur, "handle" );
			if ( handle ) {
				handle.apply( cur, data );
			}

			// Native handler
			handle = ontype && cur[ ontype ];
			if ( handle && handle.apply && jQuery.acceptData( cur ) ) {
				event.result = handle.apply( cur, data );
				if ( event.result === false ) {
					event.preventDefault();
				}
			}
		}
		event.type = type;

		// If nobody prevented the default action, do it now
		if ( !onlyHandlers && !event.isDefaultPrevented() ) {

			if ( (!special._default || special._default.apply( eventPath.pop(), data ) === false) &&
				jQuery.acceptData( elem ) ) {

				// Call a native DOM method on the target with the same name name as the event.
				// Don't do default actions on window, that's where global variables be (#6170)
				if ( ontype && jQuery.isFunction( elem[ type ] ) && !jQuery.isWindow( elem ) ) {

					// Don't re-trigger an onFOO event when we call its FOO() method
					tmp = elem[ ontype ];

					if ( tmp ) {
						elem[ ontype ] = null;
					}

					// Prevent re-triggering of the same event, since we already bubbled it above
					jQuery.event.triggered = type;
					elem[ type ]();
					jQuery.event.triggered = undefined;

					if ( tmp ) {
						elem[ ontype ] = tmp;
					}
				}
			}
		}

		return event.result;
	},

	dispatch: function( event ) {

		// Make a writable jQuery.Event from the native event object
		event = jQuery.event.fix( event );

		var i, j, ret, matched, handleObj,
			handlerQueue = [],
			args = slice.call( arguments ),
			handlers = ( data_priv.get( this, "events" ) || {} )[ event.type ] || [],
			special = jQuery.event.special[ event.type ] || {};

		// Use the fix-ed jQuery.Event rather than the (read-only) native event
		args[0] = event;
		event.delegateTarget = this;

		// Call the preDispatch hook for the mapped type, and let it bail if desired
		if ( special.preDispatch && special.preDispatch.call( this, event ) === false ) {
			return;
		}

		// Determine handlers
		handlerQueue = jQuery.event.handlers.call( this, event, handlers );

		// Run delegates first; they may want to stop propagation beneath us
		i = 0;
		while ( (matched = handlerQueue[ i++ ]) && !event.isPropagationStopped() ) {
			event.currentTarget = matched.elem;

			j = 0;
			while ( (handleObj = matched.handlers[ j++ ]) && !event.isImmediatePropagationStopped() ) {

				// Triggered event must either 1) have no namespace, or
				// 2) have namespace(s) a subset or equal to those in the bound event (both can have no namespace).
				if ( !event.namespace_re || event.namespace_re.test( handleObj.namespace ) ) {

					event.handleObj = handleObj;
					event.data = handleObj.data;

					ret = ( (jQuery.event.special[ handleObj.origType ] || {}).handle || handleObj.handler )
							.apply( matched.elem, args );

					if ( ret !== undefined ) {
						if ( (event.result = ret) === false ) {
							event.preventDefault();
							event.stopPropagation();
						}
					}
				}
			}
		}

		// Call the postDispatch hook for the mapped type
		if ( special.postDispatch ) {
			special.postDispatch.call( this, event );
		}

		return event.result;
	},

	handlers: function( event, handlers ) {
		var i, matches, sel, handleObj,
			handlerQueue = [],
			delegateCount = handlers.delegateCount,
			cur = event.target;

		// Find delegate handlers
		// Black-hole SVG <use> instance trees (#13180)
		// Avoid non-left-click bubbling in Firefox (#3861)
		if ( delegateCount && cur.nodeType && (!event.button || event.type !== "click") ) {

			for ( ; cur !== this; cur = cur.parentNode || this ) {

				// Don't process clicks on disabled elements (#6911, #8165, #11382, #11764)
				if ( cur.disabled !== true || event.type !== "click" ) {
					matches = [];
					for ( i = 0; i < delegateCount; i++ ) {
						handleObj = handlers[ i ];

						// Don't conflict with Object.prototype properties (#13203)
						sel = handleObj.selector + " ";

						if ( matches[ sel ] === undefined ) {
							matches[ sel ] = handleObj.needsContext ?
								jQuery( sel, this ).index( cur ) >= 0 :
								jQuery.find( sel, this, null, [ cur ] ).length;
						}
						if ( matches[ sel ] ) {
							matches.push( handleObj );
						}
					}
					if ( matches.length ) {
						handlerQueue.push({ elem: cur, handlers: matches });
					}
				}
			}
		}

		// Add the remaining (directly-bound) handlers
		if ( delegateCount < handlers.length ) {
			handlerQueue.push({ elem: this, handlers: handlers.slice( delegateCount ) });
		}

		return handlerQueue;
	},

	// Includes some event props shared by KeyEvent and MouseEvent
	props: "altKey bubbles cancelable ctrlKey currentTarget eventPhase metaKey relatedTarget shiftKey target timeStamp view which".split(" "),

	fixHooks: {},

	keyHooks: {
		props: "char charCode key keyCode".split(" "),
		filter: function( event, original ) {

			// Add which for key events
			if ( event.which == null ) {
				event.which = original.charCode != null ? original.charCode : original.keyCode;
			}

			return event;
		}
	},

	mouseHooks: {
		props: "button buttons clientX clientY offsetX offsetY pageX pageY screenX screenY toElement".split(" "),
		filter: function( event, original ) {
			var eventDoc, doc, body,
				button = original.button;

			// Calculate pageX/Y if missing and clientX/Y available
			if ( event.pageX == null && original.clientX != null ) {
				eventDoc = event.target.ownerDocument || document;
				doc = eventDoc.documentElement;
				body = eventDoc.body;

				event.pageX = original.clientX + ( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) - ( doc && doc.clientLeft || body && body.clientLeft || 0 );
				event.pageY = original.clientY + ( doc && doc.scrollTop  || body && body.scrollTop  || 0 ) - ( doc && doc.clientTop  || body && body.clientTop  || 0 );
			}

			// Add which for click: 1 === left; 2 === middle; 3 === right
			// Note: button is not normalized, so don't use it
			if ( !event.which && button !== undefined ) {
				event.which = ( button & 1 ? 1 : ( button & 2 ? 3 : ( button & 4 ? 2 : 0 ) ) );
			}

			return event;
		}
	},

	fix: function( event ) {
		if ( event[ jQuery.expando ] ) {
			return event;
		}

		// Create a writable copy of the event object and normalize some properties
		var i, prop, copy,
			type = event.type,
			originalEvent = event,
			fixHook = this.fixHooks[ type ];

		if ( !fixHook ) {
			this.fixHooks[ type ] = fixHook =
				rmouseEvent.test( type ) ? this.mouseHooks :
				rkeyEvent.test( type ) ? this.keyHooks :
				{};
		}
		copy = fixHook.props ? this.props.concat( fixHook.props ) : this.props;

		event = new jQuery.Event( originalEvent );

		i = copy.length;
		while ( i-- ) {
			prop = copy[ i ];
			event[ prop ] = originalEvent[ prop ];
		}

		// Support: Cordova 2.5 (WebKit) (#13255)
		// All events should have a target; Cordova deviceready doesn't
		if ( !event.target ) {
			event.target = document;
		}

		// Support: Safari 6.0+, Chrome < 28
		// Target should not be a text node (#504, #13143)
		if ( event.target.nodeType === 3 ) {
			event.target = event.target.parentNode;
		}

		return fixHook.filter ? fixHook.filter( event, originalEvent ) : event;
	},

	special: {
		load: {
			// Prevent triggered image.load events from bubbling to window.load
			noBubble: true
		},
		focus: {
			// Fire native event if possible so blur/focus sequence is correct
			trigger: function() {
				if ( this !== safeActiveElement() && this.focus ) {
					this.focus();
					return false;
				}
			},
			delegateType: "focusin"
		},
		blur: {
			trigger: function() {
				if ( this === safeActiveElement() && this.blur ) {
					this.blur();
					return false;
				}
			},
			delegateType: "focusout"
		},
		click: {
			// For checkbox, fire native event so checked state will be right
			trigger: function() {
				if ( this.type === "checkbox" && this.click && jQuery.nodeName( this, "input" ) ) {
					this.click();
					return false;
				}
			},

			// For cross-browser consistency, don't fire native .click() on links
			_default: function( event ) {
				return jQuery.nodeName( event.target, "a" );
			}
		},

		beforeunload: {
			postDispatch: function( event ) {

				// Support: Firefox 20+
				// Firefox doesn't alert if the returnValue field is not set.
				if ( event.result !== undefined && event.originalEvent ) {
					event.originalEvent.returnValue = event.result;
				}
			}
		}
	},

	simulate: function( type, elem, event, bubble ) {
		// Piggyback on a donor event to simulate a different one.
		// Fake originalEvent to avoid donor's stopPropagation, but if the
		// simulated event prevents default then we do the same on the donor.
		var e = jQuery.extend(
			new jQuery.Event(),
			event,
			{
				type: type,
				isSimulated: true,
				originalEvent: {}
			}
		);
		if ( bubble ) {
			jQuery.event.trigger( e, null, elem );
		} else {
			jQuery.event.dispatch.call( elem, e );
		}
		if ( e.isDefaultPrevented() ) {
			event.preventDefault();
		}
	}
};

jQuery.removeEvent = function( elem, type, handle ) {
	if ( elem.removeEventListener ) {
		elem.removeEventListener( type, handle, false );
	}
};

jQuery.Event = function( src, props ) {
	// Allow instantiation without the 'new' keyword
	if ( !(this instanceof jQuery.Event) ) {
		return new jQuery.Event( src, props );
	}

	// Event object
	if ( src && src.type ) {
		this.originalEvent = src;
		this.type = src.type;

		// Events bubbling up the document may have been marked as prevented
		// by a handler lower down the tree; reflect the correct value.
		this.isDefaultPrevented = src.defaultPrevented ||
				src.defaultPrevented === undefined &&
				// Support: Android < 4.0
				src.returnValue === false ?
			returnTrue :
			returnFalse;

	// Event type
	} else {
		this.type = src;
	}

	// Put explicitly provided properties onto the event object
	if ( props ) {
		jQuery.extend( this, props );
	}

	// Create a timestamp if incoming event doesn't have one
	this.timeStamp = src && src.timeStamp || jQuery.now();

	// Mark it as fixed
	this[ jQuery.expando ] = true;
};

// jQuery.Event is based on DOM3 Events as specified by the ECMAScript Language Binding
// http://www.w3.org/TR/2003/WD-DOM-Level-3-Events-20030331/ecma-script-binding.html
jQuery.Event.prototype = {
	isDefaultPrevented: returnFalse,
	isPropagationStopped: returnFalse,
	isImmediatePropagationStopped: returnFalse,

	preventDefault: function() {
		var e = this.originalEvent;

		this.isDefaultPrevented = returnTrue;

		if ( e && e.preventDefault ) {
			e.preventDefault();
		}
	},
	stopPropagation: function() {
		var e = this.originalEvent;

		this.isPropagationStopped = returnTrue;

		if ( e && e.stopPropagation ) {
			e.stopPropagation();
		}
	},
	stopImmediatePropagation: function() {
		var e = this.originalEvent;

		this.isImmediatePropagationStopped = returnTrue;

		if ( e && e.stopImmediatePropagation ) {
			e.stopImmediatePropagation();
		}

		this.stopPropagation();
	}
};

// Create mouseenter/leave events using mouseover/out and event-time checks
// Support: Chrome 15+
jQuery.each({
	mouseenter: "mouseover",
	mouseleave: "mouseout",
	pointerenter: "pointerover",
	pointerleave: "pointerout"
}, function( orig, fix ) {
	jQuery.event.special[ orig ] = {
		delegateType: fix,
		bindType: fix,

		handle: function( event ) {
			var ret,
				target = this,
				related = event.relatedTarget,
				handleObj = event.handleObj;

			// For mousenter/leave call the handler if related is outside the target.
			// NB: No relatedTarget if the mouse left/entered the browser window
			if ( !related || (related !== target && !jQuery.contains( target, related )) ) {
				event.type = handleObj.origType;
				ret = handleObj.handler.apply( this, arguments );
				event.type = fix;
			}
			return ret;
		}
	};
});

// Create "bubbling" focus and blur events
// Support: Firefox, Chrome, Safari
if ( !support.focusinBubbles ) {
	jQuery.each({ focus: "focusin", blur: "focusout" }, function( orig, fix ) {

		// Attach a single capturing handler on the document while someone wants focusin/focusout
		var handler = function( event ) {
				jQuery.event.simulate( fix, event.target, jQuery.event.fix( event ), true );
			};

		jQuery.event.special[ fix ] = {
			setup: function() {
				var doc = this.ownerDocument || this,
					attaches = data_priv.access( doc, fix );

				if ( !attaches ) {
					doc.addEventListener( orig, handler, true );
				}
				data_priv.access( doc, fix, ( attaches || 0 ) + 1 );
			},
			teardown: function() {
				var doc = this.ownerDocument || this,
					attaches = data_priv.access( doc, fix ) - 1;

				if ( !attaches ) {
					doc.removeEventListener( orig, handler, true );
					data_priv.remove( doc, fix );

				} else {
					data_priv.access( doc, fix, attaches );
				}
			}
		};
	});
}

jQuery.fn.extend({

	on: function( types, selector, data, fn, /*INTERNAL*/ one ) {
		var origFn, type;

		// Types can be a map of types/handlers
		if ( typeof types === "object" ) {
			// ( types-Object, selector, data )
			if ( typeof selector !== "string" ) {
				// ( types-Object, data )
				data = data || selector;
				selector = undefined;
			}
			for ( type in types ) {
				this.on( type, selector, data, types[ type ], one );
			}
			return this;
		}

		if ( data == null && fn == null ) {
			// ( types, fn )
			fn = selector;
			data = selector = undefined;
		} else if ( fn == null ) {
			if ( typeof selector === "string" ) {
				// ( types, selector, fn )
				fn = data;
				data = undefined;
			} else {
				// ( types, data, fn )
				fn = data;
				data = selector;
				selector = undefined;
			}
		}
		if ( fn === false ) {
			fn = returnFalse;
		} else if ( !fn ) {
			return this;
		}

		if ( one === 1 ) {
			origFn = fn;
			fn = function( event ) {
				// Can use an empty set, since event contains the info
				jQuery().off( event );
				return origFn.apply( this, arguments );
			};
			// Use same guid so caller can remove using origFn
			fn.guid = origFn.guid || ( origFn.guid = jQuery.guid++ );
		}
		return this.each( function() {
			jQuery.event.add( this, types, fn, data, selector );
		});
	},
	one: function( types, selector, data, fn ) {
		return this.on( types, selector, data, fn, 1 );
	},
	off: function( types, selector, fn ) {
		var handleObj, type;
		if ( types && types.preventDefault && types.handleObj ) {
			// ( event )  dispatched jQuery.Event
			handleObj = types.handleObj;
			jQuery( types.delegateTarget ).off(
				handleObj.namespace ? handleObj.origType + "." + handleObj.namespace : handleObj.origType,
				handleObj.selector,
				handleObj.handler
			);
			return this;
		}
		if ( typeof types === "object" ) {
			// ( types-object [, selector] )
			for ( type in types ) {
				this.off( type, selector, types[ type ] );
			}
			return this;
		}
		if ( selector === false || typeof selector === "function" ) {
			// ( types [, fn] )
			fn = selector;
			selector = undefined;
		}
		if ( fn === false ) {
			fn = returnFalse;
		}
		return this.each(function() {
			jQuery.event.remove( this, types, fn, selector );
		});
	},

	trigger: function( type, data ) {
		return this.each(function() {
			jQuery.event.trigger( type, data, this );
		});
	},
	triggerHandler: function( type, data ) {
		var elem = this[0];
		if ( elem ) {
			return jQuery.event.trigger( type, data, elem, true );
		}
	}
});


var
	rxhtmlTag = /<(?!area|br|col|embed|hr|img|input|link|meta|param)(([\w:]+)[^>]*)\/>/gi,
	rtagName = /<([\w:]+)/,
	rhtml = /<|&#?\w+;/,
	rnoInnerhtml = /<(?:script|style|link)/i,
	// checked="checked" or checked
	rchecked = /checked\s*(?:[^=]|=\s*.checked.)/i,
	rscriptType = /^$|\/(?:java|ecma)script/i,
	rscriptTypeMasked = /^true\/(.*)/,
	rcleanScript = /^\s*<!(?:\[CDATA\[|--)|(?:\]\]|--)>\s*$/g,

	// We have to close these tags to support XHTML (#13200)
	wrapMap = {

		// Support: IE 9
		option: [ 1, "<select multiple='multiple'>", "</select>" ],

		thead: [ 1, "<table>", "</table>" ],
		col: [ 2, "<table><colgroup>", "</colgroup></table>" ],
		tr: [ 2, "<table><tbody>", "</tbody></table>" ],
		td: [ 3, "<table><tbody><tr>", "</tr></tbody></table>" ],

		_default: [ 0, "", "" ]
	};

// Support: IE 9
wrapMap.optgroup = wrapMap.option;

wrapMap.tbody = wrapMap.tfoot = wrapMap.colgroup = wrapMap.caption = wrapMap.thead;
wrapMap.th = wrapMap.td;

// Support: 1.x compatibility
// Manipulating tables requires a tbody
function manipulationTarget( elem, content ) {
	return jQuery.nodeName( elem, "table" ) &&
		jQuery.nodeName( content.nodeType !== 11 ? content : content.firstChild, "tr" ) ?

		elem.getElementsByTagName("tbody")[0] ||
			elem.appendChild( elem.ownerDocument.createElement("tbody") ) :
		elem;
}

// Replace/restore the type attribute of script elements for safe DOM manipulation
function disableScript( elem ) {
	elem.type = (elem.getAttribute("type") !== null) + "/" + elem.type;
	return elem;
}
function restoreScript( elem ) {
	var match = rscriptTypeMasked.exec( elem.type );

	if ( match ) {
		elem.type = match[ 1 ];
	} else {
		elem.removeAttribute("type");
	}

	return elem;
}

// Mark scripts as having already been evaluated
function setGlobalEval( elems, refElements ) {
	var i = 0,
		l = elems.length;

	for ( ; i < l; i++ ) {
		data_priv.set(
			elems[ i ], "globalEval", !refElements || data_priv.get( refElements[ i ], "globalEval" )
		);
	}
}

function cloneCopyEvent( src, dest ) {
	var i, l, type, pdataOld, pdataCur, udataOld, udataCur, events;

	if ( dest.nodeType !== 1 ) {
		return;
	}

	// 1. Copy private data: events, handlers, etc.
	if ( data_priv.hasData( src ) ) {
		pdataOld = data_priv.access( src );
		pdataCur = data_priv.set( dest, pdataOld );
		events = pdataOld.events;

		if ( events ) {
			delete pdataCur.handle;
			pdataCur.events = {};

			for ( type in events ) {
				for ( i = 0, l = events[ type ].length; i < l; i++ ) {
					jQuery.event.add( dest, type, events[ type ][ i ] );
				}
			}
		}
	}

	// 2. Copy user data
	if ( data_user.hasData( src ) ) {
		udataOld = data_user.access( src );
		udataCur = jQuery.extend( {}, udataOld );

		data_user.set( dest, udataCur );
	}
}

function getAll( context, tag ) {
	var ret = context.getElementsByTagName ? context.getElementsByTagName( tag || "*" ) :
			context.querySelectorAll ? context.querySelectorAll( tag || "*" ) :
			[];

	return tag === undefined || tag && jQuery.nodeName( context, tag ) ?
		jQuery.merge( [ context ], ret ) :
		ret;
}

// Support: IE >= 9
function fixInput( src, dest ) {
	var nodeName = dest.nodeName.toLowerCase();

	// Fails to persist the checked state of a cloned checkbox or radio button.
	if ( nodeName === "input" && rcheckableType.test( src.type ) ) {
		dest.checked = src.checked;

	// Fails to return the selected option to the default selected state when cloning options
	} else if ( nodeName === "input" || nodeName === "textarea" ) {
		dest.defaultValue = src.defaultValue;
	}
}

jQuery.extend({
	clone: function( elem, dataAndEvents, deepDataAndEvents ) {
		var i, l, srcElements, destElements,
			clone = elem.cloneNode( true ),
			inPage = jQuery.contains( elem.ownerDocument, elem );

		// Support: IE >= 9
		// Fix Cloning issues
		if ( !support.noCloneChecked && ( elem.nodeType === 1 || elem.nodeType === 11 ) &&
				!jQuery.isXMLDoc( elem ) ) {

			// We eschew Sizzle here for performance reasons: http://jsperf.com/getall-vs-sizzle/2
			destElements = getAll( clone );
			srcElements = getAll( elem );

			for ( i = 0, l = srcElements.length; i < l; i++ ) {
				fixInput( srcElements[ i ], destElements[ i ] );
			}
		}

		// Copy the events from the original to the clone
		if ( dataAndEvents ) {
			if ( deepDataAndEvents ) {
				srcElements = srcElements || getAll( elem );
				destElements = destElements || getAll( clone );

				for ( i = 0, l = srcElements.length; i < l; i++ ) {
					cloneCopyEvent( srcElements[ i ], destElements[ i ] );
				}
			} else {
				cloneCopyEvent( elem, clone );
			}
		}

		// Preserve script evaluation history
		destElements = getAll( clone, "script" );
		if ( destElements.length > 0 ) {
			setGlobalEval( destElements, !inPage && getAll( elem, "script" ) );
		}

		// Return the cloned set
		return clone;
	},

	buildFragment: function( elems, context, scripts, selection ) {
		var elem, tmp, tag, wrap, contains, j,
			fragment = context.createDocumentFragment(),
			nodes = [],
			i = 0,
			l = elems.length;

		for ( ; i < l; i++ ) {
			elem = elems[ i ];

			if ( elem || elem === 0 ) {

				// Add nodes directly
				if ( jQuery.type( elem ) === "object" ) {
					// Support: QtWebKit
					// jQuery.merge because push.apply(_, arraylike) throws
					jQuery.merge( nodes, elem.nodeType ? [ elem ] : elem );

				// Convert non-html into a text node
				} else if ( !rhtml.test( elem ) ) {
					nodes.push( context.createTextNode( elem ) );

				// Convert html into DOM nodes
				} else {
					tmp = tmp || fragment.appendChild( context.createElement("div") );

					// Deserialize a standard representation
					tag = ( rtagName.exec( elem ) || [ "", "" ] )[ 1 ].toLowerCase();
					wrap = wrapMap[ tag ] || wrapMap._default;
					tmp.innerHTML = wrap[ 1 ] + elem.replace( rxhtmlTag, "<$1></$2>" ) + wrap[ 2 ];

					// Descend through wrappers to the right content
					j = wrap[ 0 ];
					while ( j-- ) {
						tmp = tmp.lastChild;
					}

					// Support: QtWebKit
					// jQuery.merge because push.apply(_, arraylike) throws
					jQuery.merge( nodes, tmp.childNodes );

					// Remember the top-level container
					tmp = fragment.firstChild;

					// Fixes #12346
					// Support: Webkit, IE
					tmp.textContent = "";
				}
			}
		}

		// Remove wrapper from fragment
		fragment.textContent = "";

		i = 0;
		while ( (elem = nodes[ i++ ]) ) {

			// #4087 - If origin and destination elements are the same, and this is
			// that element, do not do anything
			if ( selection && jQuery.inArray( elem, selection ) !== -1 ) {
				continue;
			}

			contains = jQuery.contains( elem.ownerDocument, elem );

			// Append to fragment
			tmp = getAll( fragment.appendChild( elem ), "script" );

			// Preserve script evaluation history
			if ( contains ) {
				setGlobalEval( tmp );
			}

			// Capture executables
			if ( scripts ) {
				j = 0;
				while ( (elem = tmp[ j++ ]) ) {
					if ( rscriptType.test( elem.type || "" ) ) {
						scripts.push( elem );
					}
				}
			}
		}

		return fragment;
	},

	cleanData: function( elems ) {
		var data, elem, type, key,
			special = jQuery.event.special,
			i = 0;

		for ( ; (elem = elems[ i ]) !== undefined; i++ ) {
			if ( jQuery.acceptData( elem ) ) {
				key = elem[ data_priv.expando ];

				if ( key && (data = data_priv.cache[ key ]) ) {
					if ( data.events ) {
						for ( type in data.events ) {
							if ( special[ type ] ) {
								jQuery.event.remove( elem, type );

							// This is a shortcut to avoid jQuery.event.remove's overhead
							} else {
								jQuery.removeEvent( elem, type, data.handle );
							}
						}
					}
					if ( data_priv.cache[ key ] ) {
						// Discard any remaining `private` data
						delete data_priv.cache[ key ];
					}
				}
			}
			// Discard any remaining `user` data
			delete data_user.cache[ elem[ data_user.expando ] ];
		}
	}
});

jQuery.fn.extend({
	text: function( value ) {
		return access( this, function( value ) {
			return value === undefined ?
				jQuery.text( this ) :
				this.empty().each(function() {
					if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
						this.textContent = value;
					}
				});
		}, null, value, arguments.length );
	},

	append: function() {
		return this.domManip( arguments, function( elem ) {
			if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
				var target = manipulationTarget( this, elem );
				target.appendChild( elem );
			}
		});
	},

	prepend: function() {
		return this.domManip( arguments, function( elem ) {
			if ( this.nodeType === 1 || this.nodeType === 11 || this.nodeType === 9 ) {
				var target = manipulationTarget( this, elem );
				target.insertBefore( elem, target.firstChild );
			}
		});
	},

	before: function() {
		return this.domManip( arguments, function( elem ) {
			if ( this.parentNode ) {
				this.parentNode.insertBefore( elem, this );
			}
		});
	},

	after: function() {
		return this.domManip( arguments, function( elem ) {
			if ( this.parentNode ) {
				this.parentNode.insertBefore( elem, this.nextSibling );
			}
		});
	},

	remove: function( selector, keepData /* Internal Use Only */ ) {
		var elem,
			elems = selector ? jQuery.filter( selector, this ) : this,
			i = 0;

		for ( ; (elem = elems[i]) != null; i++ ) {
			if ( !keepData && elem.nodeType === 1 ) {
				jQuery.cleanData( getAll( elem ) );
			}

			if ( elem.parentNode ) {
				if ( keepData && jQuery.contains( elem.ownerDocument, elem ) ) {
					setGlobalEval( getAll( elem, "script" ) );
				}
				elem.parentNode.removeChild( elem );
			}
		}

		return this;
	},

	empty: function() {
		var elem,
			i = 0;

		for ( ; (elem = this[i]) != null; i++ ) {
			if ( elem.nodeType === 1 ) {

				// Prevent memory leaks
				jQuery.cleanData( getAll( elem, false ) );

				// Remove any remaining nodes
				elem.textContent = "";
			}
		}

		return this;
	},

	clone: function( dataAndEvents, deepDataAndEvents ) {
		dataAndEvents = dataAndEvents == null ? false : dataAndEvents;
		deepDataAndEvents = deepDataAndEvents == null ? dataAndEvents : deepDataAndEvents;

		return this.map(function() {
			return jQuery.clone( this, dataAndEvents, deepDataAndEvents );
		});
	},

	html: function( value ) {
		return access( this, function( value ) {
			var elem = this[ 0 ] || {},
				i = 0,
				l = this.length;

			if ( value === undefined && elem.nodeType === 1 ) {
				return elem.innerHTML;
			}

			// See if we can take a shortcut and just use innerHTML
			if ( typeof value === "string" && !rnoInnerhtml.test( value ) &&
				!wrapMap[ ( rtagName.exec( value ) || [ "", "" ] )[ 1 ].toLowerCase() ] ) {

				value = value.replace( rxhtmlTag, "<$1></$2>" );

				try {
					for ( ; i < l; i++ ) {
						elem = this[ i ] || {};

						// Remove element nodes and prevent memory leaks
						if ( elem.nodeType === 1 ) {
							jQuery.cleanData( getAll( elem, false ) );
							elem.innerHTML = value;
						}
					}

					elem = 0;

				// If using innerHTML throws an exception, use the fallback method
				} catch( e ) {}
			}

			if ( elem ) {
				this.empty().append( value );
			}
		}, null, value, arguments.length );
	},

	replaceWith: function() {
		var arg = arguments[ 0 ];

		// Make the changes, replacing each context element with the new content
		this.domManip( arguments, function( elem ) {
			arg = this.parentNode;

			jQuery.cleanData( getAll( this ) );

			if ( arg ) {
				arg.replaceChild( elem, this );
			}
		});

		// Force removal if there was no new content (e.g., from empty arguments)
		return arg && (arg.length || arg.nodeType) ? this : this.remove();
	},

	detach: function( selector ) {
		return this.remove( selector, true );
	},

	domManip: function( args, callback ) {

		// Flatten any nested arrays
		args = concat.apply( [], args );

		var fragment, first, scripts, hasScripts, node, doc,
			i = 0,
			l = this.length,
			set = this,
			iNoClone = l - 1,
			value = args[ 0 ],
			isFunction = jQuery.isFunction( value );

		// We can't cloneNode fragments that contain checked, in WebKit
		if ( isFunction ||
				( l > 1 && typeof value === "string" &&
					!support.checkClone && rchecked.test( value ) ) ) {
			return this.each(function( index ) {
				var self = set.eq( index );
				if ( isFunction ) {
					args[ 0 ] = value.call( this, index, self.html() );
				}
				self.domManip( args, callback );
			});
		}

		if ( l ) {
			fragment = jQuery.buildFragment( args, this[ 0 ].ownerDocument, false, this );
			first = fragment.firstChild;

			if ( fragment.childNodes.length === 1 ) {
				fragment = first;
			}

			if ( first ) {
				scripts = jQuery.map( getAll( fragment, "script" ), disableScript );
				hasScripts = scripts.length;

				// Use the original fragment for the last item instead of the first because it can end up
				// being emptied incorrectly in certain situations (#8070).
				for ( ; i < l; i++ ) {
					node = fragment;

					if ( i !== iNoClone ) {
						node = jQuery.clone( node, true, true );

						// Keep references to cloned scripts for later restoration
						if ( hasScripts ) {
							// Support: QtWebKit
							// jQuery.merge because push.apply(_, arraylike) throws
							jQuery.merge( scripts, getAll( node, "script" ) );
						}
					}

					callback.call( this[ i ], node, i );
				}

				if ( hasScripts ) {
					doc = scripts[ scripts.length - 1 ].ownerDocument;

					// Reenable scripts
					jQuery.map( scripts, restoreScript );

					// Evaluate executable scripts on first document insertion
					for ( i = 0; i < hasScripts; i++ ) {
						node = scripts[ i ];
						if ( rscriptType.test( node.type || "" ) &&
							!data_priv.access( node, "globalEval" ) && jQuery.contains( doc, node ) ) {

							if ( node.src ) {
								// Optional AJAX dependency, but won't run scripts if not present
								if ( jQuery._evalUrl ) {
									jQuery._evalUrl( node.src );
								}
							} else {
								jQuery.globalEval( node.textContent.replace( rcleanScript, "" ) );
							}
						}
					}
				}
			}
		}

		return this;
	}
});

jQuery.each({
	appendTo: "append",
	prependTo: "prepend",
	insertBefore: "before",
	insertAfter: "after",
	replaceAll: "replaceWith"
}, function( name, original ) {
	jQuery.fn[ name ] = function( selector ) {
		var elems,
			ret = [],
			insert = jQuery( selector ),
			last = insert.length - 1,
			i = 0;

		for ( ; i <= last; i++ ) {
			elems = i === last ? this : this.clone( true );
			jQuery( insert[ i ] )[ original ]( elems );

			// Support: QtWebKit
			// .get() because push.apply(_, arraylike) throws
			push.apply( ret, elems.get() );
		}

		return this.pushStack( ret );
	};
});


var iframe,
	elemdisplay = {};

/**
 * Retrieve the actual display of a element
 * @param {String} name nodeName of the element
 * @param {Object} doc Document object
 */
// Called only from within defaultDisplay
function actualDisplay( name, doc ) {
	var style,
		elem = jQuery( doc.createElement( name ) ).appendTo( doc.body ),

		// getDefaultComputedStyle might be reliably used only on attached element
		display = window.getDefaultComputedStyle && ( style = window.getDefaultComputedStyle( elem[ 0 ] ) ) ?

			// Use of this method is a temporary fix (more like optmization) until something better comes along,
			// since it was removed from specification and supported only in FF
			style.display : jQuery.css( elem[ 0 ], "display" );

	// We don't have any data stored on the element,
	// so use "detach" method as fast way to get rid of the element
	elem.detach();

	return display;
}

/**
 * Try to determine the default display value of an element
 * @param {String} nodeName
 */
function defaultDisplay( nodeName ) {
	var doc = document,
		display = elemdisplay[ nodeName ];

	if ( !display ) {
		display = actualDisplay( nodeName, doc );

		// If the simple way fails, read from inside an iframe
		if ( display === "none" || !display ) {

			// Use the already-created iframe if possible
			iframe = (iframe || jQuery( "<iframe frameborder='0' width='0' height='0'/>" )).appendTo( doc.documentElement );

			// Always write a new HTML skeleton so Webkit and Firefox don't choke on reuse
			doc = iframe[ 0 ].contentDocument;

			// Support: IE
			doc.write();
			doc.close();

			display = actualDisplay( nodeName, doc );
			iframe.detach();
		}

		// Store the correct default display
		elemdisplay[ nodeName ] = display;
	}

	return display;
}
var rmargin = (/^margin/);

var rnumnonpx = new RegExp( "^(" + pnum + ")(?!px)[a-z%]+$", "i" );

var getStyles = function( elem ) {
		return elem.ownerDocument.defaultView.getComputedStyle( elem, null );
	};



function curCSS( elem, name, computed ) {
	var width, minWidth, maxWidth, ret,
		style = elem.style;

	computed = computed || getStyles( elem );

	// Support: IE9
	// getPropertyValue is only needed for .css('filter') in IE9, see #12537
	if ( computed ) {
		ret = computed.getPropertyValue( name ) || computed[ name ];
	}

	if ( computed ) {

		if ( ret === "" && !jQuery.contains( elem.ownerDocument, elem ) ) {
			ret = jQuery.style( elem, name );
		}

		// Support: iOS < 6
		// A tribute to the "awesome hack by Dean Edwards"
		// iOS < 6 (at least) returns percentage for a larger set of values, but width seems to be reliably pixels
		// this is against the CSSOM draft spec: http://dev.w3.org/csswg/cssom/#resolved-values
		if ( rnumnonpx.test( ret ) && rmargin.test( name ) ) {

			// Remember the original values
			width = style.width;
			minWidth = style.minWidth;
			maxWidth = style.maxWidth;

			// Put in the new values to get a computed value out
			style.minWidth = style.maxWidth = style.width = ret;
			ret = computed.width;

			// Revert the changed values
			style.width = width;
			style.minWidth = minWidth;
			style.maxWidth = maxWidth;
		}
	}

	return ret !== undefined ?
		// Support: IE
		// IE returns zIndex value as an integer.
		ret + "" :
		ret;
}


function addGetHookIf( conditionFn, hookFn ) {
	// Define the hook, we'll check on the first run if it's really needed.
	return {
		get: function() {
			if ( conditionFn() ) {
				// Hook not needed (or it's not possible to use it due to missing dependency),
				// remove it.
				// Since there are no other hooks for marginRight, remove the whole object.
				delete this.get;
				return;
			}

			// Hook needed; redefine it so that the support test is not executed again.

			return (this.get = hookFn).apply( this, arguments );
		}
	};
}


(function() {
	var pixelPositionVal, boxSizingReliableVal,
		docElem = document.documentElement,
		container = document.createElement( "div" ),
		div = document.createElement( "div" );

	if ( !div.style ) {
		return;
	}

	div.style.backgroundClip = "content-box";
	div.cloneNode( true ).style.backgroundClip = "";
	support.clearCloneStyle = div.style.backgroundClip === "content-box";

	container.style.cssText = "border:0;width:0;height:0;top:0;left:-9999px;margin-top:1px;" +
		"position:absolute";
	container.appendChild( div );

	// Executing both pixelPosition & boxSizingReliable tests require only one layout
	// so they're executed at the same time to save the second computation.
	function computePixelPositionAndBoxSizingReliable() {
		div.style.cssText =
			// Support: Firefox<29, Android 2.3
			// Vendor-prefix box-sizing
			"-webkit-box-sizing:border-box;-moz-box-sizing:border-box;" +
			"box-sizing:border-box;display:block;margin-top:1%;top:1%;" +
			"border:1px;padding:1px;width:4px;position:absolute";
		div.innerHTML = "";
		docElem.appendChild( container );

		var divStyle = window.getComputedStyle( div, null );
		pixelPositionVal = divStyle.top !== "1%";
		boxSizingReliableVal = divStyle.width === "4px";

		docElem.removeChild( container );
	}

	// Support: node.js jsdom
	// Don't assume that getComputedStyle is a property of the global object
	if ( window.getComputedStyle ) {
		jQuery.extend( support, {
			pixelPosition: function() {
				// This test is executed only once but we still do memoizing
				// since we can use the boxSizingReliable pre-computing.
				// No need to check if the test was already performed, though.
				computePixelPositionAndBoxSizingReliable();
				return pixelPositionVal;
			},
			boxSizingReliable: function() {
				if ( boxSizingReliableVal == null ) {
					computePixelPositionAndBoxSizingReliable();
				}
				return boxSizingReliableVal;
			},
			reliableMarginRight: function() {
				// Support: Android 2.3
				// Check if div with explicit width and no margin-right incorrectly
				// gets computed margin-right based on width of container. (#3333)
				// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
				// This support function is only executed once so no memoizing is needed.
				var ret,
					marginDiv = div.appendChild( document.createElement( "div" ) );

				// Reset CSS: box-sizing; display; margin; border; padding
				marginDiv.style.cssText = div.style.cssText =
					// Support: Firefox<29, Android 2.3
					// Vendor-prefix box-sizing
					"-webkit-box-sizing:content-box;-moz-box-sizing:content-box;" +
					"box-sizing:content-box;display:block;margin:0;border:0;padding:0";
				marginDiv.style.marginRight = marginDiv.style.width = "0";
				div.style.width = "1px";
				docElem.appendChild( container );

				ret = !parseFloat( window.getComputedStyle( marginDiv, null ).marginRight );

				docElem.removeChild( container );

				return ret;
			}
		});
	}
})();


// A method for quickly swapping in/out CSS properties to get correct calculations.
jQuery.swap = function( elem, options, callback, args ) {
	var ret, name,
		old = {};

	// Remember the old values, and insert the new ones
	for ( name in options ) {
		old[ name ] = elem.style[ name ];
		elem.style[ name ] = options[ name ];
	}

	ret = callback.apply( elem, args || [] );

	// Revert the old values
	for ( name in options ) {
		elem.style[ name ] = old[ name ];
	}

	return ret;
};


var
	// swappable if display is none or starts with table except "table", "table-cell", or "table-caption"
	// see here for display values: https://developer.mozilla.org/en-US/docs/CSS/display
	rdisplayswap = /^(none|table(?!-c[ea]).+)/,
	rnumsplit = new RegExp( "^(" + pnum + ")(.*)$", "i" ),
	rrelNum = new RegExp( "^([+-])=(" + pnum + ")", "i" ),

	cssShow = { position: "absolute", visibility: "hidden", display: "block" },
	cssNormalTransform = {
		letterSpacing: "0",
		fontWeight: "400"
	},

	cssPrefixes = [ "Webkit", "O", "Moz", "ms" ];

// return a css property mapped to a potentially vendor prefixed property
function vendorPropName( style, name ) {

	// shortcut for names that are not vendor prefixed
	if ( name in style ) {
		return name;
	}

	// check for vendor prefixed names
	var capName = name[0].toUpperCase() + name.slice(1),
		origName = name,
		i = cssPrefixes.length;

	while ( i-- ) {
		name = cssPrefixes[ i ] + capName;
		if ( name in style ) {
			return name;
		}
	}

	return origName;
}

function setPositiveNumber( elem, value, subtract ) {
	var matches = rnumsplit.exec( value );
	return matches ?
		// Guard against undefined "subtract", e.g., when used as in cssHooks
		Math.max( 0, matches[ 1 ] - ( subtract || 0 ) ) + ( matches[ 2 ] || "px" ) :
		value;
}

function augmentWidthOrHeight( elem, name, extra, isBorderBox, styles ) {
	var i = extra === ( isBorderBox ? "border" : "content" ) ?
		// If we already have the right measurement, avoid augmentation
		4 :
		// Otherwise initialize for horizontal or vertical properties
		name === "width" ? 1 : 0,

		val = 0;

	for ( ; i < 4; i += 2 ) {
		// both box models exclude margin, so add it if we want it
		if ( extra === "margin" ) {
			val += jQuery.css( elem, extra + cssExpand[ i ], true, styles );
		}

		if ( isBorderBox ) {
			// border-box includes padding, so remove it if we want content
			if ( extra === "content" ) {
				val -= jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );
			}

			// at this point, extra isn't border nor margin, so remove border
			if ( extra !== "margin" ) {
				val -= jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
			}
		} else {
			// at this point, extra isn't content, so add padding
			val += jQuery.css( elem, "padding" + cssExpand[ i ], true, styles );

			// at this point, extra isn't content nor padding, so add border
			if ( extra !== "padding" ) {
				val += jQuery.css( elem, "border" + cssExpand[ i ] + "Width", true, styles );
			}
		}
	}

	return val;
}

function getWidthOrHeight( elem, name, extra ) {

	// Start with offset property, which is equivalent to the border-box value
	var valueIsBorderBox = true,
		val = name === "width" ? elem.offsetWidth : elem.offsetHeight,
		styles = getStyles( elem ),
		isBorderBox = jQuery.css( elem, "boxSizing", false, styles ) === "border-box";

	// some non-html elements return undefined for offsetWidth, so check for null/undefined
	// svg - https://bugzilla.mozilla.org/show_bug.cgi?id=649285
	// MathML - https://bugzilla.mozilla.org/show_bug.cgi?id=491668
	if ( val <= 0 || val == null ) {
		// Fall back to computed then uncomputed css if necessary
		val = curCSS( elem, name, styles );
		if ( val < 0 || val == null ) {
			val = elem.style[ name ];
		}

		// Computed unit is not pixels. Stop here and return.
		if ( rnumnonpx.test(val) ) {
			return val;
		}

		// we need the check for style in case a browser which returns unreliable values
		// for getComputedStyle silently falls back to the reliable elem.style
		valueIsBorderBox = isBorderBox &&
			( support.boxSizingReliable() || val === elem.style[ name ] );

		// Normalize "", auto, and prepare for extra
		val = parseFloat( val ) || 0;
	}

	// use the active box-sizing model to add/subtract irrelevant styles
	return ( val +
		augmentWidthOrHeight(
			elem,
			name,
			extra || ( isBorderBox ? "border" : "content" ),
			valueIsBorderBox,
			styles
		)
	) + "px";
}

function showHide( elements, show ) {
	var display, elem, hidden,
		values = [],
		index = 0,
		length = elements.length;

	for ( ; index < length; index++ ) {
		elem = elements[ index ];
		if ( !elem.style ) {
			continue;
		}

		values[ index ] = data_priv.get( elem, "olddisplay" );
		display = elem.style.display;
		if ( show ) {
			// Reset the inline display of this element to learn if it is
			// being hidden by cascaded rules or not
			if ( !values[ index ] && display === "none" ) {
				elem.style.display = "";
			}

			// Set elements which have been overridden with display: none
			// in a stylesheet to whatever the default browser style is
			// for such an element
			if ( elem.style.display === "" && isHidden( elem ) ) {
				values[ index ] = data_priv.access( elem, "olddisplay", defaultDisplay(elem.nodeName) );
			}
		} else {
			hidden = isHidden( elem );

			if ( display !== "none" || !hidden ) {
				data_priv.set( elem, "olddisplay", hidden ? display : jQuery.css( elem, "display" ) );
			}
		}
	}

	// Set the display of most of the elements in a second loop
	// to avoid the constant reflow
	for ( index = 0; index < length; index++ ) {
		elem = elements[ index ];
		if ( !elem.style ) {
			continue;
		}
		if ( !show || elem.style.display === "none" || elem.style.display === "" ) {
			elem.style.display = show ? values[ index ] || "" : "none";
		}
	}

	return elements;
}

jQuery.extend({
	// Add in style property hooks for overriding the default
	// behavior of getting and setting a style property
	cssHooks: {
		opacity: {
			get: function( elem, computed ) {
				if ( computed ) {
					// We should always get a number back from opacity
					var ret = curCSS( elem, "opacity" );
					return ret === "" ? "1" : ret;
				}
			}
		}
	},

	// Don't automatically add "px" to these possibly-unitless properties
	cssNumber: {
		"columnCount": true,
		"fillOpacity": true,
		"flexGrow": true,
		"flexShrink": true,
		"fontWeight": true,
		"lineHeight": true,
		"opacity": true,
		"order": true,
		"orphans": true,
		"widows": true,
		"zIndex": true,
		"zoom": true
	},

	// Add in properties whose names you wish to fix before
	// setting or getting the value
	cssProps: {
		// normalize float css property
		"float": "cssFloat"
	},

	// Get and set the style property on a DOM Node
	style: function( elem, name, value, extra ) {
		// Don't set styles on text and comment nodes
		if ( !elem || elem.nodeType === 3 || elem.nodeType === 8 || !elem.style ) {
			return;
		}

		// Make sure that we're working with the right name
		var ret, type, hooks,
			origName = jQuery.camelCase( name ),
			style = elem.style;

		name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( style, origName ) );

		// gets hook for the prefixed version
		// followed by the unprefixed version
		hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];

		// Check if we're setting a value
		if ( value !== undefined ) {
			type = typeof value;

			// convert relative number strings (+= or -=) to relative numbers. #7345
			if ( type === "string" && (ret = rrelNum.exec( value )) ) {
				value = ( ret[1] + 1 ) * ret[2] + parseFloat( jQuery.css( elem, name ) );
				// Fixes bug #9237
				type = "number";
			}

			// Make sure that null and NaN values aren't set. See: #7116
			if ( value == null || value !== value ) {
				return;
			}

			// If a number was passed in, add 'px' to the (except for certain CSS properties)
			if ( type === "number" && !jQuery.cssNumber[ origName ] ) {
				value += "px";
			}

			// Fixes #8908, it can be done more correctly by specifying setters in cssHooks,
			// but it would mean to define eight (for every problematic property) identical functions
			if ( !support.clearCloneStyle && value === "" && name.indexOf( "background" ) === 0 ) {
				style[ name ] = "inherit";
			}

			// If a hook was provided, use that value, otherwise just set the specified value
			if ( !hooks || !("set" in hooks) || (value = hooks.set( elem, value, extra )) !== undefined ) {
				style[ name ] = value;
			}

		} else {
			// If a hook was provided get the non-computed value from there
			if ( hooks && "get" in hooks && (ret = hooks.get( elem, false, extra )) !== undefined ) {
				return ret;
			}

			// Otherwise just get the value from the style object
			return style[ name ];
		}
	},

	css: function( elem, name, extra, styles ) {
		var val, num, hooks,
			origName = jQuery.camelCase( name );

		// Make sure that we're working with the right name
		name = jQuery.cssProps[ origName ] || ( jQuery.cssProps[ origName ] = vendorPropName( elem.style, origName ) );

		// gets hook for the prefixed version
		// followed by the unprefixed version
		hooks = jQuery.cssHooks[ name ] || jQuery.cssHooks[ origName ];

		// If a hook was provided get the computed value from there
		if ( hooks && "get" in hooks ) {
			val = hooks.get( elem, true, extra );
		}

		// Otherwise, if a way to get the computed value exists, use that
		if ( val === undefined ) {
			val = curCSS( elem, name, styles );
		}

		//convert "normal" to computed value
		if ( val === "normal" && name in cssNormalTransform ) {
			val = cssNormalTransform[ name ];
		}

		// Return, converting to number if forced or a qualifier was provided and val looks numeric
		if ( extra === "" || extra ) {
			num = parseFloat( val );
			return extra === true || jQuery.isNumeric( num ) ? num || 0 : val;
		}
		return val;
	}
});

jQuery.each([ "height", "width" ], function( i, name ) {
	jQuery.cssHooks[ name ] = {
		get: function( elem, computed, extra ) {
			if ( computed ) {
				// certain elements can have dimension info if we invisibly show them
				// however, it must have a current display style that would benefit from this
				return rdisplayswap.test( jQuery.css( elem, "display" ) ) && elem.offsetWidth === 0 ?
					jQuery.swap( elem, cssShow, function() {
						return getWidthOrHeight( elem, name, extra );
					}) :
					getWidthOrHeight( elem, name, extra );
			}
		},

		set: function( elem, value, extra ) {
			var styles = extra && getStyles( elem );
			return setPositiveNumber( elem, value, extra ?
				augmentWidthOrHeight(
					elem,
					name,
					extra,
					jQuery.css( elem, "boxSizing", false, styles ) === "border-box",
					styles
				) : 0
			);
		}
	};
});

// Support: Android 2.3
jQuery.cssHooks.marginRight = addGetHookIf( support.reliableMarginRight,
	function( elem, computed ) {
		if ( computed ) {
			// WebKit Bug 13343 - getComputedStyle returns wrong value for margin-right
			// Work around by temporarily setting element display to inline-block
			return jQuery.swap( elem, { "display": "inline-block" },
				curCSS, [ elem, "marginRight" ] );
		}
	}
);

// These hooks are used by animate to expand properties
jQuery.each({
	margin: "",
	padding: "",
	border: "Width"
}, function( prefix, suffix ) {
	jQuery.cssHooks[ prefix + suffix ] = {
		expand: function( value ) {
			var i = 0,
				expanded = {},

				// assumes a single number if not a string
				parts = typeof value === "string" ? value.split(" ") : [ value ];

			for ( ; i < 4; i++ ) {
				expanded[ prefix + cssExpand[ i ] + suffix ] =
					parts[ i ] || parts[ i - 2 ] || parts[ 0 ];
			}

			return expanded;
		}
	};

	if ( !rmargin.test( prefix ) ) {
		jQuery.cssHooks[ prefix + suffix ].set = setPositiveNumber;
	}
});

jQuery.fn.extend({
	css: function( name, value ) {
		return access( this, function( elem, name, value ) {
			var styles, len,
				map = {},
				i = 0;

			if ( jQuery.isArray( name ) ) {
				styles = getStyles( elem );
				len = name.length;

				for ( ; i < len; i++ ) {
					map[ name[ i ] ] = jQuery.css( elem, name[ i ], false, styles );
				}

				return map;
			}

			return value !== undefined ?
				jQuery.style( elem, name, value ) :
				jQuery.css( elem, name );
		}, name, value, arguments.length > 1 );
	},
	show: function() {
		return showHide( this, true );
	},
	hide: function() {
		return showHide( this );
	},
	toggle: function( state ) {
		if ( typeof state === "boolean" ) {
			return state ? this.show() : this.hide();
		}

		return this.each(function() {
			if ( isHidden( this ) ) {
				jQuery( this ).show();
			} else {
				jQuery( this ).hide();
			}
		});
	}
});


function Tween( elem, options, prop, end, easing ) {
	return new Tween.prototype.init( elem, options, prop, end, easing );
}
jQuery.Tween = Tween;

Tween.prototype = {
	constructor: Tween,
	init: function( elem, options, prop, end, easing, unit ) {
		this.elem = elem;
		this.prop = prop;
		this.easing = easing || "swing";
		this.options = options;
		this.start = this.now = this.cur();
		this.end = end;
		this.unit = unit || ( jQuery.cssNumber[ prop ] ? "" : "px" );
	},
	cur: function() {
		var hooks = Tween.propHooks[ this.prop ];

		return hooks && hooks.get ?
			hooks.get( this ) :
			Tween.propHooks._default.get( this );
	},
	run: function( percent ) {
		var eased,
			hooks = Tween.propHooks[ this.prop ];

		if ( this.options.duration ) {
			this.pos = eased = jQuery.easing[ this.easing ](
				percent, this.options.duration * percent, 0, 1, this.options.duration
			);
		} else {
			this.pos = eased = percent;
		}
		this.now = ( this.end - this.start ) * eased + this.start;

		if ( this.options.step ) {
			this.options.step.call( this.elem, this.now, this );
		}

		if ( hooks && hooks.set ) {
			hooks.set( this );
		} else {
			Tween.propHooks._default.set( this );
		}
		return this;
	}
};

Tween.prototype.init.prototype = Tween.prototype;

Tween.propHooks = {
	_default: {
		get: function( tween ) {
			var result;

			if ( tween.elem[ tween.prop ] != null &&
				(!tween.elem.style || tween.elem.style[ tween.prop ] == null) ) {
				return tween.elem[ tween.prop ];
			}

			// passing an empty string as a 3rd parameter to .css will automatically
			// attempt a parseFloat and fallback to a string if the parse fails
			// so, simple values such as "10px" are parsed to Float.
			// complex values such as "rotate(1rad)" are returned as is.
			result = jQuery.css( tween.elem, tween.prop, "" );
			// Empty strings, null, undefined and "auto" are converted to 0.
			return !result || result === "auto" ? 0 : result;
		},
		set: function( tween ) {
			// use step hook for back compat - use cssHook if its there - use .style if its
			// available and use plain properties where available
			if ( jQuery.fx.step[ tween.prop ] ) {
				jQuery.fx.step[ tween.prop ]( tween );
			} else if ( tween.elem.style && ( tween.elem.style[ jQuery.cssProps[ tween.prop ] ] != null || jQuery.cssHooks[ tween.prop ] ) ) {
				jQuery.style( tween.elem, tween.prop, tween.now + tween.unit );
			} else {
				tween.elem[ tween.prop ] = tween.now;
			}
		}
	}
};

// Support: IE9
// Panic based approach to setting things on disconnected nodes

Tween.propHooks.scrollTop = Tween.propHooks.scrollLeft = {
	set: function( tween ) {
		if ( tween.elem.nodeType && tween.elem.parentNode ) {
			tween.elem[ tween.prop ] = tween.now;
		}
	}
};

jQuery.easing = {
	linear: function( p ) {
		return p;
	},
	swing: function( p ) {
		return 0.5 - Math.cos( p * Math.PI ) / 2;
	}
};

jQuery.fx = Tween.prototype.init;

// Back Compat <1.8 extension point
jQuery.fx.step = {};




var
	fxNow, timerId,
	rfxtypes = /^(?:toggle|show|hide)$/,
	rfxnum = new RegExp( "^(?:([+-])=|)(" + pnum + ")([a-z%]*)$", "i" ),
	rrun = /queueHooks$/,
	animationPrefilters = [ defaultPrefilter ],
	tweeners = {
		"*": [ function( prop, value ) {
			var tween = this.createTween( prop, value ),
				target = tween.cur(),
				parts = rfxnum.exec( value ),
				unit = parts && parts[ 3 ] || ( jQuery.cssNumber[ prop ] ? "" : "px" ),

				// Starting value computation is required for potential unit mismatches
				start = ( jQuery.cssNumber[ prop ] || unit !== "px" && +target ) &&
					rfxnum.exec( jQuery.css( tween.elem, prop ) ),
				scale = 1,
				maxIterations = 20;

			if ( start && start[ 3 ] !== unit ) {
				// Trust units reported by jQuery.css
				unit = unit || start[ 3 ];

				// Make sure we update the tween properties later on
				parts = parts || [];

				// Iteratively approximate from a nonzero starting point
				start = +target || 1;

				do {
					// If previous iteration zeroed out, double until we get *something*
					// Use a string for doubling factor so we don't accidentally see scale as unchanged below
					scale = scale || ".5";

					// Adjust and apply
					start = start / scale;
					jQuery.style( tween.elem, prop, start + unit );

				// Update scale, tolerating zero or NaN from tween.cur()
				// And breaking the loop if scale is unchanged or perfect, or if we've just had enough
				} while ( scale !== (scale = tween.cur() / target) && scale !== 1 && --maxIterations );
			}

			// Update tween properties
			if ( parts ) {
				start = tween.start = +start || +target || 0;
				tween.unit = unit;
				// If a +=/-= token was provided, we're doing a relative animation
				tween.end = parts[ 1 ] ?
					start + ( parts[ 1 ] + 1 ) * parts[ 2 ] :
					+parts[ 2 ];
			}

			return tween;
		} ]
	};

// Animations created synchronously will run synchronously
function createFxNow() {
	setTimeout(function() {
		fxNow = undefined;
	});
	return ( fxNow = jQuery.now() );
}

// Generate parameters to create a standard animation
function genFx( type, includeWidth ) {
	var which,
		i = 0,
		attrs = { height: type };

	// if we include width, step value is 1 to do all cssExpand values,
	// if we don't include width, step value is 2 to skip over Left and Right
	includeWidth = includeWidth ? 1 : 0;
	for ( ; i < 4 ; i += 2 - includeWidth ) {
		which = cssExpand[ i ];
		attrs[ "margin" + which ] = attrs[ "padding" + which ] = type;
	}

	if ( includeWidth ) {
		attrs.opacity = attrs.width = type;
	}

	return attrs;
}

function createTween( value, prop, animation ) {
	var tween,
		collection = ( tweeners[ prop ] || [] ).concat( tweeners[ "*" ] ),
		index = 0,
		length = collection.length;
	for ( ; index < length; index++ ) {
		if ( (tween = collection[ index ].call( animation, prop, value )) ) {

			// we're done with this property
			return tween;
		}
	}
}

function defaultPrefilter( elem, props, opts ) {
	/* jshint validthis: true */
	var prop, value, toggle, tween, hooks, oldfire, display, checkDisplay,
		anim = this,
		orig = {},
		style = elem.style,
		hidden = elem.nodeType && isHidden( elem ),
		dataShow = data_priv.get( elem, "fxshow" );

	// handle queue: false promises
	if ( !opts.queue ) {
		hooks = jQuery._queueHooks( elem, "fx" );
		if ( hooks.unqueued == null ) {
			hooks.unqueued = 0;
			oldfire = hooks.empty.fire;
			hooks.empty.fire = function() {
				if ( !hooks.unqueued ) {
					oldfire();
				}
			};
		}
		hooks.unqueued++;

		anim.always(function() {
			// doing this makes sure that the complete handler will be called
			// before this completes
			anim.always(function() {
				hooks.unqueued--;
				if ( !jQuery.queue( elem, "fx" ).length ) {
					hooks.empty.fire();
				}
			});
		});
	}

	// height/width overflow pass
	if ( elem.nodeType === 1 && ( "height" in props || "width" in props ) ) {
		// Make sure that nothing sneaks out
		// Record all 3 overflow attributes because IE9-10 do not
		// change the overflow attribute when overflowX and
		// overflowY are set to the same value
		opts.overflow = [ style.overflow, style.overflowX, style.overflowY ];

		// Set display property to inline-block for height/width
		// animations on inline elements that are having width/height animated
		display = jQuery.css( elem, "display" );

		// Test default display if display is currently "none"
		checkDisplay = display === "none" ?
			data_priv.get( elem, "olddisplay" ) || defaultDisplay( elem.nodeName ) : display;

		if ( checkDisplay === "inline" && jQuery.css( elem, "float" ) === "none" ) {
			style.display = "inline-block";
		}
	}

	if ( opts.overflow ) {
		style.overflow = "hidden";
		anim.always(function() {
			style.overflow = opts.overflow[ 0 ];
			style.overflowX = opts.overflow[ 1 ];
			style.overflowY = opts.overflow[ 2 ];
		});
	}

	// show/hide pass
	for ( prop in props ) {
		value = props[ prop ];
		if ( rfxtypes.exec( value ) ) {
			delete props[ prop ];
			toggle = toggle || value === "toggle";
			if ( value === ( hidden ? "hide" : "show" ) ) {

				// If there is dataShow left over from a stopped hide or show and we are going to proceed with show, we should pretend to be hidden
				if ( value === "show" && dataShow && dataShow[ prop ] !== undefined ) {
					hidden = true;
				} else {
					continue;
				}
			}
			orig[ prop ] = dataShow && dataShow[ prop ] || jQuery.style( elem, prop );

		// Any non-fx value stops us from restoring the original display value
		} else {
			display = undefined;
		}
	}

	if ( !jQuery.isEmptyObject( orig ) ) {
		if ( dataShow ) {
			if ( "hidden" in dataShow ) {
				hidden = dataShow.hidden;
			}
		} else {
			dataShow = data_priv.access( elem, "fxshow", {} );
		}

		// store state if its toggle - enables .stop().toggle() to "reverse"
		if ( toggle ) {
			dataShow.hidden = !hidden;
		}
		if ( hidden ) {
			jQuery( elem ).show();
		} else {
			anim.done(function() {
				jQuery( elem ).hide();
			});
		}
		anim.done(function() {
			var prop;

			data_priv.remove( elem, "fxshow" );
			for ( prop in orig ) {
				jQuery.style( elem, prop, orig[ prop ] );
			}
		});
		for ( prop in orig ) {
			tween = createTween( hidden ? dataShow[ prop ] : 0, prop, anim );

			if ( !( prop in dataShow ) ) {
				dataShow[ prop ] = tween.start;
				if ( hidden ) {
					tween.end = tween.start;
					tween.start = prop === "width" || prop === "height" ? 1 : 0;
				}
			}
		}

	// If this is a noop like .hide().hide(), restore an overwritten display value
	} else if ( (display === "none" ? defaultDisplay( elem.nodeName ) : display) === "inline" ) {
		style.display = display;
	}
}

function propFilter( props, specialEasing ) {
	var index, name, easing, value, hooks;

	// camelCase, specialEasing and expand cssHook pass
	for ( index in props ) {
		name = jQuery.camelCase( index );
		easing = specialEasing[ name ];
		value = props[ index ];
		if ( jQuery.isArray( value ) ) {
			easing = value[ 1 ];
			value = props[ index ] = value[ 0 ];
		}

		if ( index !== name ) {
			props[ name ] = value;
			delete props[ index ];
		}

		hooks = jQuery.cssHooks[ name ];
		if ( hooks && "expand" in hooks ) {
			value = hooks.expand( value );
			delete props[ name ];

			// not quite $.extend, this wont overwrite keys already present.
			// also - reusing 'index' from above because we have the correct "name"
			for ( index in value ) {
				if ( !( index in props ) ) {
					props[ index ] = value[ index ];
					specialEasing[ index ] = easing;
				}
			}
		} else {
			specialEasing[ name ] = easing;
		}
	}
}

function Animation( elem, properties, options ) {
	var result,
		stopped,
		index = 0,
		length = animationPrefilters.length,
		deferred = jQuery.Deferred().always( function() {
			// don't match elem in the :animated selector
			delete tick.elem;
		}),
		tick = function() {
			if ( stopped ) {
				return false;
			}
			var currentTime = fxNow || createFxNow(),
				remaining = Math.max( 0, animation.startTime + animation.duration - currentTime ),
				// archaic crash bug won't allow us to use 1 - ( 0.5 || 0 ) (#12497)
				temp = remaining / animation.duration || 0,
				percent = 1 - temp,
				index = 0,
				length = animation.tweens.length;

			for ( ; index < length ; index++ ) {
				animation.tweens[ index ].run( percent );
			}

			deferred.notifyWith( elem, [ animation, percent, remaining ]);

			if ( percent < 1 && length ) {
				return remaining;
			} else {
				deferred.resolveWith( elem, [ animation ] );
				return false;
			}
		},
		animation = deferred.promise({
			elem: elem,
			props: jQuery.extend( {}, properties ),
			opts: jQuery.extend( true, { specialEasing: {} }, options ),
			originalProperties: properties,
			originalOptions: options,
			startTime: fxNow || createFxNow(),
			duration: options.duration,
			tweens: [],
			createTween: function( prop, end ) {
				var tween = jQuery.Tween( elem, animation.opts, prop, end,
						animation.opts.specialEasing[ prop ] || animation.opts.easing );
				animation.tweens.push( tween );
				return tween;
			},
			stop: function( gotoEnd ) {
				var index = 0,
					// if we are going to the end, we want to run all the tweens
					// otherwise we skip this part
					length = gotoEnd ? animation.tweens.length : 0;
				if ( stopped ) {
					return this;
				}
				stopped = true;
				for ( ; index < length ; index++ ) {
					animation.tweens[ index ].run( 1 );
				}

				// resolve when we played the last frame
				// otherwise, reject
				if ( gotoEnd ) {
					deferred.resolveWith( elem, [ animation, gotoEnd ] );
				} else {
					deferred.rejectWith( elem, [ animation, gotoEnd ] );
				}
				return this;
			}
		}),
		props = animation.props;

	propFilter( props, animation.opts.specialEasing );

	for ( ; index < length ; index++ ) {
		result = animationPrefilters[ index ].call( animation, elem, props, animation.opts );
		if ( result ) {
			return result;
		}
	}

	jQuery.map( props, createTween, animation );

	if ( jQuery.isFunction( animation.opts.start ) ) {
		animation.opts.start.call( elem, animation );
	}

	jQuery.fx.timer(
		jQuery.extend( tick, {
			elem: elem,
			anim: animation,
			queue: animation.opts.queue
		})
	);

	// attach callbacks from options
	return animation.progress( animation.opts.progress )
		.done( animation.opts.done, animation.opts.complete )
		.fail( animation.opts.fail )
		.always( animation.opts.always );
}

jQuery.Animation = jQuery.extend( Animation, {

	tweener: function( props, callback ) {
		if ( jQuery.isFunction( props ) ) {
			callback = props;
			props = [ "*" ];
		} else {
			props = props.split(" ");
		}

		var prop,
			index = 0,
			length = props.length;

		for ( ; index < length ; index++ ) {
			prop = props[ index ];
			tweeners[ prop ] = tweeners[ prop ] || [];
			tweeners[ prop ].unshift( callback );
		}
	},

	prefilter: function( callback, prepend ) {
		if ( prepend ) {
			animationPrefilters.unshift( callback );
		} else {
			animationPrefilters.push( callback );
		}
	}
});

jQuery.speed = function( speed, easing, fn ) {
	var opt = speed && typeof speed === "object" ? jQuery.extend( {}, speed ) : {
		complete: fn || !fn && easing ||
			jQuery.isFunction( speed ) && speed,
		duration: speed,
		easing: fn && easing || easing && !jQuery.isFunction( easing ) && easing
	};

	opt.duration = jQuery.fx.off ? 0 : typeof opt.duration === "number" ? opt.duration :
		opt.duration in jQuery.fx.speeds ? jQuery.fx.speeds[ opt.duration ] : jQuery.fx.speeds._default;

	// normalize opt.queue - true/undefined/null -> "fx"
	if ( opt.queue == null || opt.queue === true ) {
		opt.queue = "fx";
	}

	// Queueing
	opt.old = opt.complete;

	opt.complete = function() {
		if ( jQuery.isFunction( opt.old ) ) {
			opt.old.call( this );
		}

		if ( opt.queue ) {
			jQuery.dequeue( this, opt.queue );
		}
	};

	return opt;
};

jQuery.fn.extend({
	fadeTo: function( speed, to, easing, callback ) {

		// show any hidden elements after setting opacity to 0
		return this.filter( isHidden ).css( "opacity", 0 ).show()

			// animate to the value specified
			.end().animate({ opacity: to }, speed, easing, callback );
	},
	animate: function( prop, speed, easing, callback ) {
		var empty = jQuery.isEmptyObject( prop ),
			optall = jQuery.speed( speed, easing, callback ),
			doAnimation = function() {
				// Operate on a copy of prop so per-property easing won't be lost
				var anim = Animation( this, jQuery.extend( {}, prop ), optall );

				// Empty animations, or finishing resolves immediately
				if ( empty || data_priv.get( this, "finish" ) ) {
					anim.stop( true );
				}
			};
			doAnimation.finish = doAnimation;

		return empty || optall.queue === false ?
			this.each( doAnimation ) :
			this.queue( optall.queue, doAnimation );
	},
	stop: function( type, clearQueue, gotoEnd ) {
		var stopQueue = function( hooks ) {
			var stop = hooks.stop;
			delete hooks.stop;
			stop( gotoEnd );
		};

		if ( typeof type !== "string" ) {
			gotoEnd = clearQueue;
			clearQueue = type;
			type = undefined;
		}
		if ( clearQueue && type !== false ) {
			this.queue( type || "fx", [] );
		}

		return this.each(function() {
			var dequeue = true,
				index = type != null && type + "queueHooks",
				timers = jQuery.timers,
				data = data_priv.get( this );

			if ( index ) {
				if ( data[ index ] && data[ index ].stop ) {
					stopQueue( data[ index ] );
				}
			} else {
				for ( index in data ) {
					if ( data[ index ] && data[ index ].stop && rrun.test( index ) ) {
						stopQueue( data[ index ] );
					}
				}
			}

			for ( index = timers.length; index--; ) {
				if ( timers[ index ].elem === this && (type == null || timers[ index ].queue === type) ) {
					timers[ index ].anim.stop( gotoEnd );
					dequeue = false;
					timers.splice( index, 1 );
				}
			}

			// start the next in the queue if the last step wasn't forced
			// timers currently will call their complete callbacks, which will dequeue
			// but only if they were gotoEnd
			if ( dequeue || !gotoEnd ) {
				jQuery.dequeue( this, type );
			}
		});
	},
	finish: function( type ) {
		if ( type !== false ) {
			type = type || "fx";
		}
		return this.each(function() {
			var index,
				data = data_priv.get( this ),
				queue = data[ type + "queue" ],
				hooks = data[ type + "queueHooks" ],
				timers = jQuery.timers,
				length = queue ? queue.length : 0;

			// enable finishing flag on private data
			data.finish = true;

			// empty the queue first
			jQuery.queue( this, type, [] );

			if ( hooks && hooks.stop ) {
				hooks.stop.call( this, true );
			}

			// look for any active animations, and finish them
			for ( index = timers.length; index--; ) {
				if ( timers[ index ].elem === this && timers[ index ].queue === type ) {
					timers[ index ].anim.stop( true );
					timers.splice( index, 1 );
				}
			}

			// look for any animations in the old queue and finish them
			for ( index = 0; index < length; index++ ) {
				if ( queue[ index ] && queue[ index ].finish ) {
					queue[ index ].finish.call( this );
				}
			}

			// turn off finishing flag
			delete data.finish;
		});
	}
});

jQuery.each([ "toggle", "show", "hide" ], function( i, name ) {
	var cssFn = jQuery.fn[ name ];
	jQuery.fn[ name ] = function( speed, easing, callback ) {
		return speed == null || typeof speed === "boolean" ?
			cssFn.apply( this, arguments ) :
			this.animate( genFx( name, true ), speed, easing, callback );
	};
});

// Generate shortcuts for custom animations
jQuery.each({
	slideDown: genFx("show"),
	slideUp: genFx("hide"),
	slideToggle: genFx("toggle"),
	fadeIn: { opacity: "show" },
	fadeOut: { opacity: "hide" },
	fadeToggle: { opacity: "toggle" }
}, function( name, props ) {
	jQuery.fn[ name ] = function( speed, easing, callback ) {
		return this.animate( props, speed, easing, callback );
	};
});

jQuery.timers = [];
jQuery.fx.tick = function() {
	var timer,
		i = 0,
		timers = jQuery.timers;

	fxNow = jQuery.now();

	for ( ; i < timers.length; i++ ) {
		timer = timers[ i ];
		// Checks the timer has not already been removed
		if ( !timer() && timers[ i ] === timer ) {
			timers.splice( i--, 1 );
		}
	}

	if ( !timers.length ) {
		jQuery.fx.stop();
	}
	fxNow = undefined;
};

jQuery.fx.timer = function( timer ) {
	jQuery.timers.push( timer );
	if ( timer() ) {
		jQuery.fx.start();
	} else {
		jQuery.timers.pop();
	}
};

jQuery.fx.interval = 13;

jQuery.fx.start = function() {
	if ( !timerId ) {
		timerId = setInterval( jQuery.fx.tick, jQuery.fx.interval );
	}
};

jQuery.fx.stop = function() {
	clearInterval( timerId );
	timerId = null;
};

jQuery.fx.speeds = {
	slow: 600,
	fast: 200,
	// Default speed
	_default: 400
};


// Based off of the plugin by Clint Helfers, with permission.
// http://blindsignals.com/index.php/2009/07/jquery-delay/
jQuery.fn.delay = function( time, type ) {
	time = jQuery.fx ? jQuery.fx.speeds[ time ] || time : time;
	type = type || "fx";

	return this.queue( type, function( next, hooks ) {
		var timeout = setTimeout( next, time );
		hooks.stop = function() {
			clearTimeout( timeout );
		};
	});
};


(function() {
	var input = document.createElement( "input" ),
		select = document.createElement( "select" ),
		opt = select.appendChild( document.createElement( "option" ) );

	input.type = "checkbox";

	// Support: iOS 5.1, Android 4.x, Android 2.3
	// Check the default checkbox/radio value ("" on old WebKit; "on" elsewhere)
	support.checkOn = input.value !== "";

	// Must access the parent to make an option select properly
	// Support: IE9, IE10
	support.optSelected = opt.selected;

	// Make sure that the options inside disabled selects aren't marked as disabled
	// (WebKit marks them as disabled)
	select.disabled = true;
	support.optDisabled = !opt.disabled;

	// Check if an input maintains its value after becoming a radio
	// Support: IE9, IE10
	input = document.createElement( "input" );
	input.value = "t";
	input.type = "radio";
	support.radioValue = input.value === "t";
})();


var nodeHook, boolHook,
	attrHandle = jQuery.expr.attrHandle;

jQuery.fn.extend({
	attr: function( name, value ) {
		return access( this, jQuery.attr, name, value, arguments.length > 1 );
	},

	removeAttr: function( name ) {
		return this.each(function() {
			jQuery.removeAttr( this, name );
		});
	}
});

jQuery.extend({
	attr: function( elem, name, value ) {
		var hooks, ret,
			nType = elem.nodeType;

		// don't get/set attributes on text, comment and attribute nodes
		if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
			return;
		}

		// Fallback to prop when attributes are not supported
		if ( typeof elem.getAttribute === strundefined ) {
			return jQuery.prop( elem, name, value );
		}

		// All attributes are lowercase
		// Grab necessary hook if one is defined
		if ( nType !== 1 || !jQuery.isXMLDoc( elem ) ) {
			name = name.toLowerCase();
			hooks = jQuery.attrHooks[ name ] ||
				( jQuery.expr.match.bool.test( name ) ? boolHook : nodeHook );
		}

		if ( value !== undefined ) {

			if ( value === null ) {
				jQuery.removeAttr( elem, name );

			} else if ( hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ) {
				return ret;

			} else {
				elem.setAttribute( name, value + "" );
				return value;
			}

		} else if ( hooks && "get" in hooks && (ret = hooks.get( elem, name )) !== null ) {
			return ret;

		} else {
			ret = jQuery.find.attr( elem, name );

			// Non-existent attributes return null, we normalize to undefined
			return ret == null ?
				undefined :
				ret;
		}
	},

	removeAttr: function( elem, value ) {
		var name, propName,
			i = 0,
			attrNames = value && value.match( rnotwhite );

		if ( attrNames && elem.nodeType === 1 ) {
			while ( (name = attrNames[i++]) ) {
				propName = jQuery.propFix[ name ] || name;

				// Boolean attributes get special treatment (#10870)
				if ( jQuery.expr.match.bool.test( name ) ) {
					// Set corresponding property to false
					elem[ propName ] = false;
				}

				elem.removeAttribute( name );
			}
		}
	},

	attrHooks: {
		type: {
			set: function( elem, value ) {
				if ( !support.radioValue && value === "radio" &&
					jQuery.nodeName( elem, "input" ) ) {
					// Setting the type on a radio button after the value resets the value in IE6-9
					// Reset value to default in case type is set after value during creation
					var val = elem.value;
					elem.setAttribute( "type", value );
					if ( val ) {
						elem.value = val;
					}
					return value;
				}
			}
		}
	}
});

// Hooks for boolean attributes
boolHook = {
	set: function( elem, value, name ) {
		if ( value === false ) {
			// Remove boolean attributes when set to false
			jQuery.removeAttr( elem, name );
		} else {
			elem.setAttribute( name, name );
		}
		return name;
	}
};
jQuery.each( jQuery.expr.match.bool.source.match( /\w+/g ), function( i, name ) {
	var getter = attrHandle[ name ] || jQuery.find.attr;

	attrHandle[ name ] = function( elem, name, isXML ) {
		var ret, handle;
		if ( !isXML ) {
			// Avoid an infinite loop by temporarily removing this function from the getter
			handle = attrHandle[ name ];
			attrHandle[ name ] = ret;
			ret = getter( elem, name, isXML ) != null ?
				name.toLowerCase() :
				null;
			attrHandle[ name ] = handle;
		}
		return ret;
	};
});




var rfocusable = /^(?:input|select|textarea|button)$/i;

jQuery.fn.extend({
	prop: function( name, value ) {
		return access( this, jQuery.prop, name, value, arguments.length > 1 );
	},

	removeProp: function( name ) {
		return this.each(function() {
			delete this[ jQuery.propFix[ name ] || name ];
		});
	}
});

jQuery.extend({
	propFix: {
		"for": "htmlFor",
		"class": "className"
	},

	prop: function( elem, name, value ) {
		var ret, hooks, notxml,
			nType = elem.nodeType;

		// don't get/set properties on text, comment and attribute nodes
		if ( !elem || nType === 3 || nType === 8 || nType === 2 ) {
			return;
		}

		notxml = nType !== 1 || !jQuery.isXMLDoc( elem );

		if ( notxml ) {
			// Fix name and attach hooks
			name = jQuery.propFix[ name ] || name;
			hooks = jQuery.propHooks[ name ];
		}

		if ( value !== undefined ) {
			return hooks && "set" in hooks && (ret = hooks.set( elem, value, name )) !== undefined ?
				ret :
				( elem[ name ] = value );

		} else {
			return hooks && "get" in hooks && (ret = hooks.get( elem, name )) !== null ?
				ret :
				elem[ name ];
		}
	},

	propHooks: {
		tabIndex: {
			get: function( elem ) {
				return elem.hasAttribute( "tabindex" ) || rfocusable.test( elem.nodeName ) || elem.href ?
					elem.tabIndex :
					-1;
			}
		}
	}
});

// Support: IE9+
// Selectedness for an option in an optgroup can be inaccurate
if ( !support.optSelected ) {
	jQuery.propHooks.selected = {
		get: function( elem ) {
			var parent = elem.parentNode;
			if ( parent && parent.parentNode ) {
				parent.parentNode.selectedIndex;
			}
			return null;
		}
	};
}

jQuery.each([
	"tabIndex",
	"readOnly",
	"maxLength",
	"cellSpacing",
	"cellPadding",
	"rowSpan",
	"colSpan",
	"useMap",
	"frameBorder",
	"contentEditable"
], function() {
	jQuery.propFix[ this.toLowerCase() ] = this;
});




var rclass = /[\t\r\n\f]/g;

jQuery.fn.extend({
	addClass: function( value ) {
		var classes, elem, cur, clazz, j, finalValue,
			proceed = typeof value === "string" && value,
			i = 0,
			len = this.length;

		if ( jQuery.isFunction( value ) ) {
			return this.each(function( j ) {
				jQuery( this ).addClass( value.call( this, j, this.className ) );
			});
		}

		if ( proceed ) {
			// The disjunction here is for better compressibility (see removeClass)
			classes = ( value || "" ).match( rnotwhite ) || [];

			for ( ; i < len; i++ ) {
				elem = this[ i ];
				cur = elem.nodeType === 1 && ( elem.className ?
					( " " + elem.className + " " ).replace( rclass, " " ) :
					" "
				);

				if ( cur ) {
					j = 0;
					while ( (clazz = classes[j++]) ) {
						if ( cur.indexOf( " " + clazz + " " ) < 0 ) {
							cur += clazz + " ";
						}
					}

					// only assign if different to avoid unneeded rendering.
					finalValue = jQuery.trim( cur );
					if ( elem.className !== finalValue ) {
						elem.className = finalValue;
					}
				}
			}
		}

		return this;
	},

	removeClass: function( value ) {
		var classes, elem, cur, clazz, j, finalValue,
			proceed = arguments.length === 0 || typeof value === "string" && value,
			i = 0,
			len = this.length;

		if ( jQuery.isFunction( value ) ) {
			return this.each(function( j ) {
				jQuery( this ).removeClass( value.call( this, j, this.className ) );
			});
		}
		if ( proceed ) {
			classes = ( value || "" ).match( rnotwhite ) || [];

			for ( ; i < len; i++ ) {
				elem = this[ i ];
				// This expression is here for better compressibility (see addClass)
				cur = elem.nodeType === 1 && ( elem.className ?
					( " " + elem.className + " " ).replace( rclass, " " ) :
					""
				);

				if ( cur ) {
					j = 0;
					while ( (clazz = classes[j++]) ) {
						// Remove *all* instances
						while ( cur.indexOf( " " + clazz + " " ) >= 0 ) {
							cur = cur.replace( " " + clazz + " ", " " );
						}
					}

					// only assign if different to avoid unneeded rendering.
					finalValue = value ? jQuery.trim( cur ) : "";
					if ( elem.className !== finalValue ) {
						elem.className = finalValue;
					}
				}
			}
		}

		return this;
	},

	toggleClass: function( value, stateVal ) {
		var type = typeof value;

		if ( typeof stateVal === "boolean" && type === "string" ) {
			return stateVal ? this.addClass( value ) : this.removeClass( value );
		}

		if ( jQuery.isFunction( value ) ) {
			return this.each(function( i ) {
				jQuery( this ).toggleClass( value.call(this, i, this.className, stateVal), stateVal );
			});
		}

		return this.each(function() {
			if ( type === "string" ) {
				// toggle individual class names
				var className,
					i = 0,
					self = jQuery( this ),
					classNames = value.match( rnotwhite ) || [];

				while ( (className = classNames[ i++ ]) ) {
					// check each className given, space separated list
					if ( self.hasClass( className ) ) {
						self.removeClass( className );
					} else {
						self.addClass( className );
					}
				}

			// Toggle whole class name
			} else if ( type === strundefined || type === "boolean" ) {
				if ( this.className ) {
					// store className if set
					data_priv.set( this, "__className__", this.className );
				}

				// If the element has a class name or if we're passed "false",
				// then remove the whole classname (if there was one, the above saved it).
				// Otherwise bring back whatever was previously saved (if anything),
				// falling back to the empty string if nothing was stored.
				this.className = this.className || value === false ? "" : data_priv.get( this, "__className__" ) || "";
			}
		});
	},

	hasClass: function( selector ) {
		var className = " " + selector + " ",
			i = 0,
			l = this.length;
		for ( ; i < l; i++ ) {
			if ( this[i].nodeType === 1 && (" " + this[i].className + " ").replace(rclass, " ").indexOf( className ) >= 0 ) {
				return true;
			}
		}

		return false;
	}
});




var rreturn = /\r/g;

jQuery.fn.extend({
	val: function( value ) {
		var hooks, ret, isFunction,
			elem = this[0];

		if ( !arguments.length ) {
			if ( elem ) {
				hooks = jQuery.valHooks[ elem.type ] || jQuery.valHooks[ elem.nodeName.toLowerCase() ];

				if ( hooks && "get" in hooks && (ret = hooks.get( elem, "value" )) !== undefined ) {
					return ret;
				}

				ret = elem.value;

				return typeof ret === "string" ?
					// handle most common string cases
					ret.replace(rreturn, "") :
					// handle cases where value is null/undef or number
					ret == null ? "" : ret;
			}

			return;
		}

		isFunction = jQuery.isFunction( value );

		return this.each(function( i ) {
			var val;

			if ( this.nodeType !== 1 ) {
				return;
			}

			if ( isFunction ) {
				val = value.call( this, i, jQuery( this ).val() );
			} else {
				val = value;
			}

			// Treat null/undefined as ""; convert numbers to string
			if ( val == null ) {
				val = "";

			} else if ( typeof val === "number" ) {
				val += "";

			} else if ( jQuery.isArray( val ) ) {
				val = jQuery.map( val, function( value ) {
					return value == null ? "" : value + "";
				});
			}

			hooks = jQuery.valHooks[ this.type ] || jQuery.valHooks[ this.nodeName.toLowerCase() ];

			// If set returns undefined, fall back to normal setting
			if ( !hooks || !("set" in hooks) || hooks.set( this, val, "value" ) === undefined ) {
				this.value = val;
			}
		});
	}
});

jQuery.extend({
	valHooks: {
		option: {
			get: function( elem ) {
				var val = jQuery.find.attr( elem, "value" );
				return val != null ?
					val :
					// Support: IE10-11+
					// option.text throws exceptions (#14686, #14858)
					jQuery.trim( jQuery.text( elem ) );
			}
		},
		select: {
			get: function( elem ) {
				var value, option,
					options = elem.options,
					index = elem.selectedIndex,
					one = elem.type === "select-one" || index < 0,
					values = one ? null : [],
					max = one ? index + 1 : options.length,
					i = index < 0 ?
						max :
						one ? index : 0;

				// Loop through all the selected options
				for ( ; i < max; i++ ) {
					option = options[ i ];

					// IE6-9 doesn't update selected after form reset (#2551)
					if ( ( option.selected || i === index ) &&
							// Don't return options that are disabled or in a disabled optgroup
							( support.optDisabled ? !option.disabled : option.getAttribute( "disabled" ) === null ) &&
							( !option.parentNode.disabled || !jQuery.nodeName( option.parentNode, "optgroup" ) ) ) {

						// Get the specific value for the option
						value = jQuery( option ).val();

						// We don't need an array for one selects
						if ( one ) {
							return value;
						}

						// Multi-Selects return an array
						values.push( value );
					}
				}

				return values;
			},

			set: function( elem, value ) {
				var optionSet, option,
					options = elem.options,
					values = jQuery.makeArray( value ),
					i = options.length;

				while ( i-- ) {
					option = options[ i ];
					if ( (option.selected = jQuery.inArray( option.value, values ) >= 0) ) {
						optionSet = true;
					}
				}

				// force browsers to behave consistently when non-matching value is set
				if ( !optionSet ) {
					elem.selectedIndex = -1;
				}
				return values;
			}
		}
	}
});

// Radios and checkboxes getter/setter
jQuery.each([ "radio", "checkbox" ], function() {
	jQuery.valHooks[ this ] = {
		set: function( elem, value ) {
			if ( jQuery.isArray( value ) ) {
				return ( elem.checked = jQuery.inArray( jQuery(elem).val(), value ) >= 0 );
			}
		}
	};
	if ( !support.checkOn ) {
		jQuery.valHooks[ this ].get = function( elem ) {
			// Support: Webkit
			// "" is returned instead of "on" if a value isn't specified
			return elem.getAttribute("value") === null ? "on" : elem.value;
		};
	}
});




// Return jQuery for attributes-only inclusion


jQuery.each( ("blur focus focusin focusout load resize scroll unload click dblclick " +
	"mousedown mouseup mousemove mouseover mouseout mouseenter mouseleave " +
	"change select submit keydown keypress keyup error contextmenu").split(" "), function( i, name ) {

	// Handle event binding
	jQuery.fn[ name ] = function( data, fn ) {
		return arguments.length > 0 ?
			this.on( name, null, data, fn ) :
			this.trigger( name );
	};
});

jQuery.fn.extend({
	hover: function( fnOver, fnOut ) {
		return this.mouseenter( fnOver ).mouseleave( fnOut || fnOver );
	},

	bind: function( types, data, fn ) {
		return this.on( types, null, data, fn );
	},
	unbind: function( types, fn ) {
		return this.off( types, null, fn );
	},

	delegate: function( selector, types, data, fn ) {
		return this.on( types, selector, data, fn );
	},
	undelegate: function( selector, types, fn ) {
		// ( namespace ) or ( selector, types [, fn] )
		return arguments.length === 1 ? this.off( selector, "**" ) : this.off( types, selector || "**", fn );
	}
});


var nonce = jQuery.now();

var rquery = (/\?/);



// Support: Android 2.3
// Workaround failure to string-cast null input
jQuery.parseJSON = function( data ) {
	return JSON.parse( data + "" );
};


// Cross-browser xml parsing
jQuery.parseXML = function( data ) {
	var xml, tmp;
	if ( !data || typeof data !== "string" ) {
		return null;
	}

	// Support: IE9
	try {
		tmp = new DOMParser();
		xml = tmp.parseFromString( data, "text/xml" );
	} catch ( e ) {
		xml = undefined;
	}

	if ( !xml || xml.getElementsByTagName( "parsererror" ).length ) {
		jQuery.error( "Invalid XML: " + data );
	}
	return xml;
};


var
	// Document location
	ajaxLocParts,
	ajaxLocation,

	rhash = /#.*$/,
	rts = /([?&])_=[^&]*/,
	rheaders = /^(.*?):[ \t]*([^\r\n]*)$/mg,
	// #7653, #8125, #8152: local protocol detection
	rlocalProtocol = /^(?:about|app|app-storage|.+-extension|file|res|widget):$/,
	rnoContent = /^(?:GET|HEAD)$/,
	rprotocol = /^\/\//,
	rurl = /^([\w.+-]+:)(?:\/\/(?:[^\/?#]*@|)([^\/?#:]*)(?::(\d+)|)|)/,

	/* Prefilters
	 * 1) They are useful to introduce custom dataTypes (see ajax/jsonp.js for an example)
	 * 2) These are called:
	 *    - BEFORE asking for a transport
	 *    - AFTER param serialization (s.data is a string if s.processData is true)
	 * 3) key is the dataType
	 * 4) the catchall symbol "*" can be used
	 * 5) execution will start with transport dataType and THEN continue down to "*" if needed
	 */
	prefilters = {},

	/* Transports bindings
	 * 1) key is the dataType
	 * 2) the catchall symbol "*" can be used
	 * 3) selection will start with transport dataType and THEN go to "*" if needed
	 */
	transports = {},

	// Avoid comment-prolog char sequence (#10098); must appease lint and evade compression
	allTypes = "*/".concat("*");

// #8138, IE may throw an exception when accessing
// a field from window.location if document.domain has been set
try {
	ajaxLocation = location.href;
} catch( e ) {
	// Use the href attribute of an A element
	// since IE will modify it given document.location
	ajaxLocation = document.createElement( "a" );
	ajaxLocation.href = "";
	ajaxLocation = ajaxLocation.href;
}

// Segment location into parts
ajaxLocParts = rurl.exec( ajaxLocation.toLowerCase() ) || [];

// Base "constructor" for jQuery.ajaxPrefilter and jQuery.ajaxTransport
function addToPrefiltersOrTransports( structure ) {

	// dataTypeExpression is optional and defaults to "*"
	return function( dataTypeExpression, func ) {

		if ( typeof dataTypeExpression !== "string" ) {
			func = dataTypeExpression;
			dataTypeExpression = "*";
		}

		var dataType,
			i = 0,
			dataTypes = dataTypeExpression.toLowerCase().match( rnotwhite ) || [];

		if ( jQuery.isFunction( func ) ) {
			// For each dataType in the dataTypeExpression
			while ( (dataType = dataTypes[i++]) ) {
				// Prepend if requested
				if ( dataType[0] === "+" ) {
					dataType = dataType.slice( 1 ) || "*";
					(structure[ dataType ] = structure[ dataType ] || []).unshift( func );

				// Otherwise append
				} else {
					(structure[ dataType ] = structure[ dataType ] || []).push( func );
				}
			}
		}
	};
}

// Base inspection function for prefilters and transports
function inspectPrefiltersOrTransports( structure, options, originalOptions, jqXHR ) {

	var inspected = {},
		seekingTransport = ( structure === transports );

	function inspect( dataType ) {
		var selected;
		inspected[ dataType ] = true;
		jQuery.each( structure[ dataType ] || [], function( _, prefilterOrFactory ) {
			var dataTypeOrTransport = prefilterOrFactory( options, originalOptions, jqXHR );
			if ( typeof dataTypeOrTransport === "string" && !seekingTransport && !inspected[ dataTypeOrTransport ] ) {
				options.dataTypes.unshift( dataTypeOrTransport );
				inspect( dataTypeOrTransport );
				return false;
			} else if ( seekingTransport ) {
				return !( selected = dataTypeOrTransport );
			}
		});
		return selected;
	}

	return inspect( options.dataTypes[ 0 ] ) || !inspected[ "*" ] && inspect( "*" );
}

// A special extend for ajax options
// that takes "flat" options (not to be deep extended)
// Fixes #9887
function ajaxExtend( target, src ) {
	var key, deep,
		flatOptions = jQuery.ajaxSettings.flatOptions || {};

	for ( key in src ) {
		if ( src[ key ] !== undefined ) {
			( flatOptions[ key ] ? target : ( deep || (deep = {}) ) )[ key ] = src[ key ];
		}
	}
	if ( deep ) {
		jQuery.extend( true, target, deep );
	}

	return target;
}

/* Handles responses to an ajax request:
 * - finds the right dataType (mediates between content-type and expected dataType)
 * - returns the corresponding response
 */
function ajaxHandleResponses( s, jqXHR, responses ) {

	var ct, type, finalDataType, firstDataType,
		contents = s.contents,
		dataTypes = s.dataTypes;

	// Remove auto dataType and get content-type in the process
	while ( dataTypes[ 0 ] === "*" ) {
		dataTypes.shift();
		if ( ct === undefined ) {
			ct = s.mimeType || jqXHR.getResponseHeader("Content-Type");
		}
	}

	// Check if we're dealing with a known content-type
	if ( ct ) {
		for ( type in contents ) {
			if ( contents[ type ] && contents[ type ].test( ct ) ) {
				dataTypes.unshift( type );
				break;
			}
		}
	}

	// Check to see if we have a response for the expected dataType
	if ( dataTypes[ 0 ] in responses ) {
		finalDataType = dataTypes[ 0 ];
	} else {
		// Try convertible dataTypes
		for ( type in responses ) {
			if ( !dataTypes[ 0 ] || s.converters[ type + " " + dataTypes[0] ] ) {
				finalDataType = type;
				break;
			}
			if ( !firstDataType ) {
				firstDataType = type;
			}
		}
		// Or just use first one
		finalDataType = finalDataType || firstDataType;
	}

	// If we found a dataType
	// We add the dataType to the list if needed
	// and return the corresponding response
	if ( finalDataType ) {
		if ( finalDataType !== dataTypes[ 0 ] ) {
			dataTypes.unshift( finalDataType );
		}
		return responses[ finalDataType ];
	}
}

/* Chain conversions given the request and the original response
 * Also sets the responseXXX fields on the jqXHR instance
 */
function ajaxConvert( s, response, jqXHR, isSuccess ) {
	var conv2, current, conv, tmp, prev,
		converters = {},
		// Work with a copy of dataTypes in case we need to modify it for conversion
		dataTypes = s.dataTypes.slice();

	// Create converters map with lowercased keys
	if ( dataTypes[ 1 ] ) {
		for ( conv in s.converters ) {
			converters[ conv.toLowerCase() ] = s.converters[ conv ];
		}
	}

	current = dataTypes.shift();

	// Convert to each sequential dataType
	while ( current ) {

		if ( s.responseFields[ current ] ) {
			jqXHR[ s.responseFields[ current ] ] = response;
		}

		// Apply the dataFilter if provided
		if ( !prev && isSuccess && s.dataFilter ) {
			response = s.dataFilter( response, s.dataType );
		}

		prev = current;
		current = dataTypes.shift();

		if ( current ) {

		// There's only work to do if current dataType is non-auto
			if ( current === "*" ) {

				current = prev;

			// Convert response if prev dataType is non-auto and differs from current
			} else if ( prev !== "*" && prev !== current ) {

				// Seek a direct converter
				conv = converters[ prev + " " + current ] || converters[ "* " + current ];

				// If none found, seek a pair
				if ( !conv ) {
					for ( conv2 in converters ) {

						// If conv2 outputs current
						tmp = conv2.split( " " );
						if ( tmp[ 1 ] === current ) {

							// If prev can be converted to accepted input
							conv = converters[ prev + " " + tmp[ 0 ] ] ||
								converters[ "* " + tmp[ 0 ] ];
							if ( conv ) {
								// Condense equivalence converters
								if ( conv === true ) {
									conv = converters[ conv2 ];

								// Otherwise, insert the intermediate dataType
								} else if ( converters[ conv2 ] !== true ) {
									current = tmp[ 0 ];
									dataTypes.unshift( tmp[ 1 ] );
								}
								break;
							}
						}
					}
				}

				// Apply converter (if not an equivalence)
				if ( conv !== true ) {

					// Unless errors are allowed to bubble, catch and return them
					if ( conv && s[ "throws" ] ) {
						response = conv( response );
					} else {
						try {
							response = conv( response );
						} catch ( e ) {
							return { state: "parsererror", error: conv ? e : "No conversion from " + prev + " to " + current };
						}
					}
				}
			}
		}
	}

	return { state: "success", data: response };
}

jQuery.extend({

	// Counter for holding the number of active queries
	active: 0,

	// Last-Modified header cache for next request
	lastModified: {},
	etag: {},

	ajaxSettings: {
		url: ajaxLocation,
		type: "GET",
		isLocal: rlocalProtocol.test( ajaxLocParts[ 1 ] ),
		global: true,
		processData: true,
		async: true,
		contentType: "application/x-www-form-urlencoded; charset=UTF-8",
		/*
		timeout: 0,
		data: null,
		dataType: null,
		username: null,
		password: null,
		cache: null,
		throws: false,
		traditional: false,
		headers: {},
		*/

		accepts: {
			"*": allTypes,
			text: "text/plain",
			html: "text/html",
			xml: "application/xml, text/xml",
			json: "application/json, text/javascript"
		},

		contents: {
			xml: /xml/,
			html: /html/,
			json: /json/
		},

		responseFields: {
			xml: "responseXML",
			text: "responseText",
			json: "responseJSON"
		},

		// Data converters
		// Keys separate source (or catchall "*") and destination types with a single space
		converters: {

			// Convert anything to text
			"* text": String,

			// Text to html (true = no transformation)
			"text html": true,

			// Evaluate text as a json expression
			"text json": jQuery.parseJSON,

			// Parse text as xml
			"text xml": jQuery.parseXML
		},

		// For options that shouldn't be deep extended:
		// you can add your own custom options here if
		// and when you create one that shouldn't be
		// deep extended (see ajaxExtend)
		flatOptions: {
			url: true,
			context: true
		}
	},

	// Creates a full fledged settings object into target
	// with both ajaxSettings and settings fields.
	// If target is omitted, writes into ajaxSettings.
	ajaxSetup: function( target, settings ) {
		return settings ?

			// Building a settings object
			ajaxExtend( ajaxExtend( target, jQuery.ajaxSettings ), settings ) :

			// Extending ajaxSettings
			ajaxExtend( jQuery.ajaxSettings, target );
	},

	ajaxPrefilter: addToPrefiltersOrTransports( prefilters ),
	ajaxTransport: addToPrefiltersOrTransports( transports ),

	// Main method
	ajax: function( url, options ) {

		// If url is an object, simulate pre-1.5 signature
		if ( typeof url === "object" ) {
			options = url;
			url = undefined;
		}

		// Force options to be an object
		options = options || {};

		var transport,
			// URL without anti-cache param
			cacheURL,
			// Response headers
			responseHeadersString,
			responseHeaders,
			// timeout handle
			timeoutTimer,
			// Cross-domain detection vars
			parts,
			// To know if global events are to be dispatched
			fireGlobals,
			// Loop variable
			i,
			// Create the final options object
			s = jQuery.ajaxSetup( {}, options ),
			// Callbacks context
			callbackContext = s.context || s,
			// Context for global events is callbackContext if it is a DOM node or jQuery collection
			globalEventContext = s.context && ( callbackContext.nodeType || callbackContext.jquery ) ?
				jQuery( callbackContext ) :
				jQuery.event,
			// Deferreds
			deferred = jQuery.Deferred(),
			completeDeferred = jQuery.Callbacks("once memory"),
			// Status-dependent callbacks
			statusCode = s.statusCode || {},
			// Headers (they are sent all at once)
			requestHeaders = {},
			requestHeadersNames = {},
			// The jqXHR state
			state = 0,
			// Default abort message
			strAbort = "canceled",
			// Fake xhr
			jqXHR = {
				readyState: 0,

				// Builds headers hashtable if needed
				getResponseHeader: function( key ) {
					var match;
					if ( state === 2 ) {
						if ( !responseHeaders ) {
							responseHeaders = {};
							while ( (match = rheaders.exec( responseHeadersString )) ) {
								responseHeaders[ match[1].toLowerCase() ] = match[ 2 ];
							}
						}
						match = responseHeaders[ key.toLowerCase() ];
					}
					return match == null ? null : match;
				},

				// Raw string
				getAllResponseHeaders: function() {
					return state === 2 ? responseHeadersString : null;
				},

				// Caches the header
				setRequestHeader: function( name, value ) {
					var lname = name.toLowerCase();
					if ( !state ) {
						name = requestHeadersNames[ lname ] = requestHeadersNames[ lname ] || name;
						requestHeaders[ name ] = value;
					}
					return this;
				},

				// Overrides response content-type header
				overrideMimeType: function( type ) {
					if ( !state ) {
						s.mimeType = type;
					}
					return this;
				},

				// Status-dependent callbacks
				statusCode: function( map ) {
					var code;
					if ( map ) {
						if ( state < 2 ) {
							for ( code in map ) {
								// Lazy-add the new callback in a way that preserves old ones
								statusCode[ code ] = [ statusCode[ code ], map[ code ] ];
							}
						} else {
							// Execute the appropriate callbacks
							jqXHR.always( map[ jqXHR.status ] );
						}
					}
					return this;
				},

				// Cancel the request
				abort: function( statusText ) {
					var finalText = statusText || strAbort;
					if ( transport ) {
						transport.abort( finalText );
					}
					done( 0, finalText );
					return this;
				}
			};

		// Attach deferreds
		deferred.promise( jqXHR ).complete = completeDeferred.add;
		jqXHR.success = jqXHR.done;
		jqXHR.error = jqXHR.fail;

		// Remove hash character (#7531: and string promotion)
		// Add protocol if not provided (prefilters might expect it)
		// Handle falsy url in the settings object (#10093: consistency with old signature)
		// We also use the url parameter if available
		s.url = ( ( url || s.url || ajaxLocation ) + "" ).replace( rhash, "" )
			.replace( rprotocol, ajaxLocParts[ 1 ] + "//" );

		// Alias method option to type as per ticket #12004
		s.type = options.method || options.type || s.method || s.type;

		// Extract dataTypes list
		s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().match( rnotwhite ) || [ "" ];

		// A cross-domain request is in order when we have a protocol:host:port mismatch
		if ( s.crossDomain == null ) {
			parts = rurl.exec( s.url.toLowerCase() );
			s.crossDomain = !!( parts &&
				( parts[ 1 ] !== ajaxLocParts[ 1 ] || parts[ 2 ] !== ajaxLocParts[ 2 ] ||
					( parts[ 3 ] || ( parts[ 1 ] === "http:" ? "80" : "443" ) ) !==
						( ajaxLocParts[ 3 ] || ( ajaxLocParts[ 1 ] === "http:" ? "80" : "443" ) ) )
			);
		}

		// Convert data if not already a string
		if ( s.data && s.processData && typeof s.data !== "string" ) {
			s.data = jQuery.param( s.data, s.traditional );
		}

		// Apply prefilters
		inspectPrefiltersOrTransports( prefilters, s, options, jqXHR );

		// If request was aborted inside a prefilter, stop there
		if ( state === 2 ) {
			return jqXHR;
		}

		// We can fire global events as of now if asked to
		fireGlobals = s.global;

		// Watch for a new set of requests
		if ( fireGlobals && jQuery.active++ === 0 ) {
			jQuery.event.trigger("ajaxStart");
		}

		// Uppercase the type
		s.type = s.type.toUpperCase();

		// Determine if request has content
		s.hasContent = !rnoContent.test( s.type );

		// Save the URL in case we're toying with the If-Modified-Since
		// and/or If-None-Match header later on
		cacheURL = s.url;

		// More options handling for requests with no content
		if ( !s.hasContent ) {

			// If data is available, append data to url
			if ( s.data ) {
				cacheURL = ( s.url += ( rquery.test( cacheURL ) ? "&" : "?" ) + s.data );
				// #9682: remove data so that it's not used in an eventual retry
				delete s.data;
			}

			// Add anti-cache in url if needed
			if ( s.cache === false ) {
				s.url = rts.test( cacheURL ) ?

					// If there is already a '_' parameter, set its value
					cacheURL.replace( rts, "$1_=" + nonce++ ) :

					// Otherwise add one to the end
					cacheURL + ( rquery.test( cacheURL ) ? "&" : "?" ) + "_=" + nonce++;
			}
		}

		// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
		if ( s.ifModified ) {
			if ( jQuery.lastModified[ cacheURL ] ) {
				jqXHR.setRequestHeader( "If-Modified-Since", jQuery.lastModified[ cacheURL ] );
			}
			if ( jQuery.etag[ cacheURL ] ) {
				jqXHR.setRequestHeader( "If-None-Match", jQuery.etag[ cacheURL ] );
			}
		}

		// Set the correct header, if data is being sent
		if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
			jqXHR.setRequestHeader( "Content-Type", s.contentType );
		}

		// Set the Accepts header for the server, depending on the dataType
		jqXHR.setRequestHeader(
			"Accept",
			s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[0] ] ?
				s.accepts[ s.dataTypes[0] ] + ( s.dataTypes[ 0 ] !== "*" ? ", " + allTypes + "; q=0.01" : "" ) :
				s.accepts[ "*" ]
		);

		// Check for headers option
		for ( i in s.headers ) {
			jqXHR.setRequestHeader( i, s.headers[ i ] );
		}

		// Allow custom headers/mimetypes and early abort
		if ( s.beforeSend && ( s.beforeSend.call( callbackContext, jqXHR, s ) === false || state === 2 ) ) {
			// Abort if not done already and return
			return jqXHR.abort();
		}

		// aborting is no longer a cancellation
		strAbort = "abort";

		// Install callbacks on deferreds
		for ( i in { success: 1, error: 1, complete: 1 } ) {
			jqXHR[ i ]( s[ i ] );
		}

		// Get transport
		transport = inspectPrefiltersOrTransports( transports, s, options, jqXHR );

		// If no transport, we auto-abort
		if ( !transport ) {
			done( -1, "No Transport" );
		} else {
			jqXHR.readyState = 1;

			// Send global event
			if ( fireGlobals ) {
				globalEventContext.trigger( "ajaxSend", [ jqXHR, s ] );
			}
			// Timeout
			if ( s.async && s.timeout > 0 ) {
				timeoutTimer = setTimeout(function() {
					jqXHR.abort("timeout");
				}, s.timeout );
			}

			try {
				state = 1;
				transport.send( requestHeaders, done );
			} catch ( e ) {
				// Propagate exception as error if not done
				if ( state < 2 ) {
					done( -1, e );
				// Simply rethrow otherwise
				} else {
					throw e;
				}
			}
		}

		// Callback for when everything is done
		function done( status, nativeStatusText, responses, headers ) {
			var isSuccess, success, error, response, modified,
				statusText = nativeStatusText;

			// Called once
			if ( state === 2 ) {
				return;
			}

			// State is "done" now
			state = 2;

			// Clear timeout if it exists
			if ( timeoutTimer ) {
				clearTimeout( timeoutTimer );
			}

			// Dereference transport for early garbage collection
			// (no matter how long the jqXHR object will be used)
			transport = undefined;

			// Cache response headers
			responseHeadersString = headers || "";

			// Set readyState
			jqXHR.readyState = status > 0 ? 4 : 0;

			// Determine if successful
			isSuccess = status >= 200 && status < 300 || status === 304;

			// Get response data
			if ( responses ) {
				response = ajaxHandleResponses( s, jqXHR, responses );
			}

			// Convert no matter what (that way responseXXX fields are always set)
			response = ajaxConvert( s, response, jqXHR, isSuccess );

			// If successful, handle type chaining
			if ( isSuccess ) {

				// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
				if ( s.ifModified ) {
					modified = jqXHR.getResponseHeader("Last-Modified");
					if ( modified ) {
						jQuery.lastModified[ cacheURL ] = modified;
					}
					modified = jqXHR.getResponseHeader("etag");
					if ( modified ) {
						jQuery.etag[ cacheURL ] = modified;
					}
				}

				// if no content
				if ( status === 204 || s.type === "HEAD" ) {
					statusText = "nocontent";

				// if not modified
				} else if ( status === 304 ) {
					statusText = "notmodified";

				// If we have data, let's convert it
				} else {
					statusText = response.state;
					success = response.data;
					error = response.error;
					isSuccess = !error;
				}
			} else {
				// We extract error from statusText
				// then normalize statusText and status for non-aborts
				error = statusText;
				if ( status || !statusText ) {
					statusText = "error";
					if ( status < 0 ) {
						status = 0;
					}
				}
			}

			// Set data for the fake xhr object
			jqXHR.status = status;
			jqXHR.statusText = ( nativeStatusText || statusText ) + "";

			// Success/Error
			if ( isSuccess ) {
				deferred.resolveWith( callbackContext, [ success, statusText, jqXHR ] );
			} else {
				deferred.rejectWith( callbackContext, [ jqXHR, statusText, error ] );
			}

			// Status-dependent callbacks
			jqXHR.statusCode( statusCode );
			statusCode = undefined;

			if ( fireGlobals ) {
				globalEventContext.trigger( isSuccess ? "ajaxSuccess" : "ajaxError",
					[ jqXHR, s, isSuccess ? success : error ] );
			}

			// Complete
			completeDeferred.fireWith( callbackContext, [ jqXHR, statusText ] );

			if ( fireGlobals ) {
				globalEventContext.trigger( "ajaxComplete", [ jqXHR, s ] );
				// Handle the global AJAX counter
				if ( !( --jQuery.active ) ) {
					jQuery.event.trigger("ajaxStop");
				}
			}
		}

		return jqXHR;
	},

	getJSON: function( url, data, callback ) {
		return jQuery.get( url, data, callback, "json" );
	},

	getScript: function( url, callback ) {
		return jQuery.get( url, undefined, callback, "script" );
	}
});

jQuery.each( [ "get", "post" ], function( i, method ) {
	jQuery[ method ] = function( url, data, callback, type ) {
		// shift arguments if data argument was omitted
		if ( jQuery.isFunction( data ) ) {
			type = type || callback;
			callback = data;
			data = undefined;
		}

		return jQuery.ajax({
			url: url,
			type: method,
			dataType: type,
			data: data,
			success: callback
		});
	};
});

// Attach a bunch of functions for handling common AJAX events
jQuery.each( [ "ajaxStart", "ajaxStop", "ajaxComplete", "ajaxError", "ajaxSuccess", "ajaxSend" ], function( i, type ) {
	jQuery.fn[ type ] = function( fn ) {
		return this.on( type, fn );
	};
});


jQuery._evalUrl = function( url ) {
	return jQuery.ajax({
		url: url,
		type: "GET",
		dataType: "script",
		async: false,
		global: false,
		"throws": true
	});
};


jQuery.fn.extend({
	wrapAll: function( html ) {
		var wrap;

		if ( jQuery.isFunction( html ) ) {
			return this.each(function( i ) {
				jQuery( this ).wrapAll( html.call(this, i) );
			});
		}

		if ( this[ 0 ] ) {

			// The elements to wrap the target around
			wrap = jQuery( html, this[ 0 ].ownerDocument ).eq( 0 ).clone( true );

			if ( this[ 0 ].parentNode ) {
				wrap.insertBefore( this[ 0 ] );
			}

			wrap.map(function() {
				var elem = this;

				while ( elem.firstElementChild ) {
					elem = elem.firstElementChild;
				}

				return elem;
			}).append( this );
		}

		return this;
	},

	wrapInner: function( html ) {
		if ( jQuery.isFunction( html ) ) {
			return this.each(function( i ) {
				jQuery( this ).wrapInner( html.call(this, i) );
			});
		}

		return this.each(function() {
			var self = jQuery( this ),
				contents = self.contents();

			if ( contents.length ) {
				contents.wrapAll( html );

			} else {
				self.append( html );
			}
		});
	},

	wrap: function( html ) {
		var isFunction = jQuery.isFunction( html );

		return this.each(function( i ) {
			jQuery( this ).wrapAll( isFunction ? html.call(this, i) : html );
		});
	},

	unwrap: function() {
		return this.parent().each(function() {
			if ( !jQuery.nodeName( this, "body" ) ) {
				jQuery( this ).replaceWith( this.childNodes );
			}
		}).end();
	}
});


jQuery.expr.filters.hidden = function( elem ) {
	// Support: Opera <= 12.12
	// Opera reports offsetWidths and offsetHeights less than zero on some elements
	return elem.offsetWidth <= 0 && elem.offsetHeight <= 0;
};
jQuery.expr.filters.visible = function( elem ) {
	return !jQuery.expr.filters.hidden( elem );
};




var r20 = /%20/g,
	rbracket = /\[\]$/,
	rCRLF = /\r?\n/g,
	rsubmitterTypes = /^(?:submit|button|image|reset|file)$/i,
	rsubmittable = /^(?:input|select|textarea|keygen)/i;

function buildParams( prefix, obj, traditional, add ) {
	var name;

	if ( jQuery.isArray( obj ) ) {
		// Serialize array item.
		jQuery.each( obj, function( i, v ) {
			if ( traditional || rbracket.test( prefix ) ) {
				// Treat each array item as a scalar.
				add( prefix, v );

			} else {
				// Item is non-scalar (array or object), encode its numeric index.
				buildParams( prefix + "[" + ( typeof v === "object" ? i : "" ) + "]", v, traditional, add );
			}
		});

	} else if ( !traditional && jQuery.type( obj ) === "object" ) {
		// Serialize object item.
		for ( name in obj ) {
			buildParams( prefix + "[" + name + "]", obj[ name ], traditional, add );
		}

	} else {
		// Serialize scalar item.
		add( prefix, obj );
	}
}

// Serialize an array of form elements or a set of
// key/values into a query string
jQuery.param = function( a, traditional ) {
	var prefix,
		s = [],
		add = function( key, value ) {
			// If value is a function, invoke it and return its value
			value = jQuery.isFunction( value ) ? value() : ( value == null ? "" : value );
			s[ s.length ] = encodeURIComponent( key ) + "=" + encodeURIComponent( value );
		};

	// Set traditional to true for jQuery <= 1.3.2 behavior.
	if ( traditional === undefined ) {
		traditional = jQuery.ajaxSettings && jQuery.ajaxSettings.traditional;
	}

	// If an array was passed in, assume that it is an array of form elements.
	if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {
		// Serialize the form elements
		jQuery.each( a, function() {
			add( this.name, this.value );
		});

	} else {
		// If traditional, encode the "old" way (the way 1.3.2 or older
		// did it), otherwise encode params recursively.
		for ( prefix in a ) {
			buildParams( prefix, a[ prefix ], traditional, add );
		}
	}

	// Return the resulting serialization
	return s.join( "&" ).replace( r20, "+" );
};

jQuery.fn.extend({
	serialize: function() {
		return jQuery.param( this.serializeArray() );
	},
	serializeArray: function() {
		return this.map(function() {
			// Can add propHook for "elements" to filter or add form elements
			var elements = jQuery.prop( this, "elements" );
			return elements ? jQuery.makeArray( elements ) : this;
		})
		.filter(function() {
			var type = this.type;

			// Use .is( ":disabled" ) so that fieldset[disabled] works
			return this.name && !jQuery( this ).is( ":disabled" ) &&
				rsubmittable.test( this.nodeName ) && !rsubmitterTypes.test( type ) &&
				( this.checked || !rcheckableType.test( type ) );
		})
		.map(function( i, elem ) {
			var val = jQuery( this ).val();

			return val == null ?
				null :
				jQuery.isArray( val ) ?
					jQuery.map( val, function( val ) {
						return { name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
					}) :
					{ name: elem.name, value: val.replace( rCRLF, "\r\n" ) };
		}).get();
	}
});


jQuery.ajaxSettings.xhr = function() {
	try {
		return new XMLHttpRequest();
	} catch( e ) {}
};

var xhrId = 0,
	xhrCallbacks = {},
	xhrSuccessStatus = {
		// file protocol always yields status code 0, assume 200
		0: 200,
		// Support: IE9
		// #1450: sometimes IE returns 1223 when it should be 204
		1223: 204
	},
	xhrSupported = jQuery.ajaxSettings.xhr();

// Support: IE9
// Open requests must be manually aborted on unload (#5280)
if ( window.ActiveXObject ) {
	jQuery( window ).on( "unload", function() {
		for ( var key in xhrCallbacks ) {
			xhrCallbacks[ key ]();
		}
	});
}

support.cors = !!xhrSupported && ( "withCredentials" in xhrSupported );
support.ajax = xhrSupported = !!xhrSupported;

jQuery.ajaxTransport(function( options ) {
	var callback;

	// Cross domain only allowed if supported through XMLHttpRequest
	if ( support.cors || xhrSupported && !options.crossDomain ) {
		return {
			send: function( headers, complete ) {
				var i,
					xhr = options.xhr(),
					id = ++xhrId;

				xhr.open( options.type, options.url, options.async, options.username, options.password );

				// Apply custom fields if provided
				if ( options.xhrFields ) {
					for ( i in options.xhrFields ) {
						xhr[ i ] = options.xhrFields[ i ];
					}
				}

				// Override mime type if needed
				if ( options.mimeType && xhr.overrideMimeType ) {
					xhr.overrideMimeType( options.mimeType );
				}

				// X-Requested-With header
				// For cross-domain requests, seeing as conditions for a preflight are
				// akin to a jigsaw puzzle, we simply never set it to be sure.
				// (it can always be set on a per-request basis or even using ajaxSetup)
				// For same-domain requests, won't change header if already provided.
				if ( !options.crossDomain && !headers["X-Requested-With"] ) {
					headers["X-Requested-With"] = "XMLHttpRequest";
				}

				// Set headers
				for ( i in headers ) {
					xhr.setRequestHeader( i, headers[ i ] );
				}

				// Callback
				callback = function( type ) {
					return function() {
						if ( callback ) {
							delete xhrCallbacks[ id ];
							callback = xhr.onload = xhr.onerror = null;

							if ( type === "abort" ) {
								xhr.abort();
							} else if ( type === "error" ) {
								complete(
									// file: protocol always yields status 0; see #8605, #14207
									xhr.status,
									xhr.statusText
								);
							} else {
								complete(
									xhrSuccessStatus[ xhr.status ] || xhr.status,
									xhr.statusText,
									// Support: IE9
									// Accessing binary-data responseText throws an exception
									// (#11426)
									typeof xhr.responseText === "string" ? {
										text: xhr.responseText
									} : undefined,
									xhr.getAllResponseHeaders()
								);
							}
						}
					};
				};

				// Listen to events
				xhr.onload = callback();
				xhr.onerror = callback("error");

				// Create the abort callback
				callback = xhrCallbacks[ id ] = callback("abort");

				try {
					// Do send the request (this may raise an exception)
					xhr.send( options.hasContent && options.data || null );
				} catch ( e ) {
					// #14683: Only rethrow if this hasn't been notified as an error yet
					if ( callback ) {
						throw e;
					}
				}
			},

			abort: function() {
				if ( callback ) {
					callback();
				}
			}
		};
	}
});




// Install script dataType
jQuery.ajaxSetup({
	accepts: {
		script: "text/javascript, application/javascript, application/ecmascript, application/x-ecmascript"
	},
	contents: {
		script: /(?:java|ecma)script/
	},
	converters: {
		"text script": function( text ) {
			jQuery.globalEval( text );
			return text;
		}
	}
});

// Handle cache's special case and crossDomain
jQuery.ajaxPrefilter( "script", function( s ) {
	if ( s.cache === undefined ) {
		s.cache = false;
	}
	if ( s.crossDomain ) {
		s.type = "GET";
	}
});

// Bind script tag hack transport
jQuery.ajaxTransport( "script", function( s ) {
	// This transport only deals with cross domain requests
	if ( s.crossDomain ) {
		var script, callback;
		return {
			send: function( _, complete ) {
				script = jQuery("<script>").prop({
					async: true,
					charset: s.scriptCharset,
					src: s.url
				}).on(
					"load error",
					callback = function( evt ) {
						script.remove();
						callback = null;
						if ( evt ) {
							complete( evt.type === "error" ? 404 : 200, evt.type );
						}
					}
				);
				document.head.appendChild( script[ 0 ] );
			},
			abort: function() {
				if ( callback ) {
					callback();
				}
			}
		};
	}
});




var oldCallbacks = [],
	rjsonp = /(=)\?(?=&|$)|\?\?/;

// Default jsonp settings
jQuery.ajaxSetup({
	jsonp: "callback",
	jsonpCallback: function() {
		var callback = oldCallbacks.pop() || ( jQuery.expando + "_" + ( nonce++ ) );
		this[ callback ] = true;
		return callback;
	}
});

// Detect, normalize options and install callbacks for jsonp requests
jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) {

	var callbackName, overwritten, responseContainer,
		jsonProp = s.jsonp !== false && ( rjsonp.test( s.url ) ?
			"url" :
			typeof s.data === "string" && !( s.contentType || "" ).indexOf("application/x-www-form-urlencoded") && rjsonp.test( s.data ) && "data"
		);

	// Handle iff the expected data type is "jsonp" or we have a parameter to set
	if ( jsonProp || s.dataTypes[ 0 ] === "jsonp" ) {

		// Get callback name, remembering preexisting value associated with it
		callbackName = s.jsonpCallback = jQuery.isFunction( s.jsonpCallback ) ?
			s.jsonpCallback() :
			s.jsonpCallback;

		// Insert callback into url or form data
		if ( jsonProp ) {
			s[ jsonProp ] = s[ jsonProp ].replace( rjsonp, "$1" + callbackName );
		} else if ( s.jsonp !== false ) {
			s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.jsonp + "=" + callbackName;
		}

		// Use data converter to retrieve json after script execution
		s.converters["script json"] = function() {
			if ( !responseContainer ) {
				jQuery.error( callbackName + " was not called" );
			}
			return responseContainer[ 0 ];
		};

		// force json dataType
		s.dataTypes[ 0 ] = "json";

		// Install callback
		overwritten = window[ callbackName ];
		window[ callbackName ] = function() {
			responseContainer = arguments;
		};

		// Clean-up function (fires after converters)
		jqXHR.always(function() {
			// Restore preexisting value
			window[ callbackName ] = overwritten;

			// Save back as free
			if ( s[ callbackName ] ) {
				// make sure that re-using the options doesn't screw things around
				s.jsonpCallback = originalSettings.jsonpCallback;

				// save the callback name for future use
				oldCallbacks.push( callbackName );
			}

			// Call if it was a function and we have a response
			if ( responseContainer && jQuery.isFunction( overwritten ) ) {
				overwritten( responseContainer[ 0 ] );
			}

			responseContainer = overwritten = undefined;
		});

		// Delegate to script
		return "script";
	}
});




// data: string of html
// context (optional): If specified, the fragment will be created in this context, defaults to document
// keepScripts (optional): If true, will include scripts passed in the html string
jQuery.parseHTML = function( data, context, keepScripts ) {
	if ( !data || typeof data !== "string" ) {
		return null;
	}
	if ( typeof context === "boolean" ) {
		keepScripts = context;
		context = false;
	}
	context = context || document;

	var parsed = rsingleTag.exec( data ),
		scripts = !keepScripts && [];

	// Single tag
	if ( parsed ) {
		return [ context.createElement( parsed[1] ) ];
	}

	parsed = jQuery.buildFragment( [ data ], context, scripts );

	if ( scripts && scripts.length ) {
		jQuery( scripts ).remove();
	}

	return jQuery.merge( [], parsed.childNodes );
};


// Keep a copy of the old load method
var _load = jQuery.fn.load;

/**
 * Load a url into a page
 */
jQuery.fn.load = function( url, params, callback ) {
	if ( typeof url !== "string" && _load ) {
		return _load.apply( this, arguments );
	}

	var selector, type, response,
		self = this,
		off = url.indexOf(" ");

	if ( off >= 0 ) {
		selector = jQuery.trim( url.slice( off ) );
		url = url.slice( 0, off );
	}

	// If it's a function
	if ( jQuery.isFunction( params ) ) {

		// We assume that it's the callback
		callback = params;
		params = undefined;

	// Otherwise, build a param string
	} else if ( params && typeof params === "object" ) {
		type = "POST";
	}

	// If we have elements to modify, make the request
	if ( self.length > 0 ) {
		jQuery.ajax({
			url: url,

			// if "type" variable is undefined, then "GET" method will be used
			type: type,
			dataType: "html",
			data: params
		}).done(function( responseText ) {

			// Save response for use in complete callback
			response = arguments;

			self.html( selector ?

				// If a selector was specified, locate the right elements in a dummy div
				// Exclude scripts to avoid IE 'Permission Denied' errors
				jQuery("<div>").append( jQuery.parseHTML( responseText ) ).find( selector ) :

				// Otherwise use the full result
				responseText );

		}).complete( callback && function( jqXHR, status ) {
			self.each( callback, response || [ jqXHR.responseText, status, jqXHR ] );
		});
	}

	return this;
};




jQuery.expr.filters.animated = function( elem ) {
	return jQuery.grep(jQuery.timers, function( fn ) {
		return elem === fn.elem;
	}).length;
};




var docElem = window.document.documentElement;

/**
 * Gets a window from an element
 */
function getWindow( elem ) {
	return jQuery.isWindow( elem ) ? elem : elem.nodeType === 9 && elem.defaultView;
}

jQuery.offset = {
	setOffset: function( elem, options, i ) {
		var curPosition, curLeft, curCSSTop, curTop, curOffset, curCSSLeft, calculatePosition,
			position = jQuery.css( elem, "position" ),
			curElem = jQuery( elem ),
			props = {};

		// Set position first, in-case top/left are set even on static elem
		if ( position === "static" ) {
			elem.style.position = "relative";
		}

		curOffset = curElem.offset();
		curCSSTop = jQuery.css( elem, "top" );
		curCSSLeft = jQuery.css( elem, "left" );
		calculatePosition = ( position === "absolute" || position === "fixed" ) &&
			( curCSSTop + curCSSLeft ).indexOf("auto") > -1;

		// Need to be able to calculate position if either top or left is auto and position is either absolute or fixed
		if ( calculatePosition ) {
			curPosition = curElem.position();
			curTop = curPosition.top;
			curLeft = curPosition.left;

		} else {
			curTop = parseFloat( curCSSTop ) || 0;
			curLeft = parseFloat( curCSSLeft ) || 0;
		}

		if ( jQuery.isFunction( options ) ) {
			options = options.call( elem, i, curOffset );
		}

		if ( options.top != null ) {
			props.top = ( options.top - curOffset.top ) + curTop;
		}
		if ( options.left != null ) {
			props.left = ( options.left - curOffset.left ) + curLeft;
		}

		if ( "using" in options ) {
			options.using.call( elem, props );

		} else {
			curElem.css( props );
		}
	}
};

jQuery.fn.extend({
	offset: function( options ) {
		if ( arguments.length ) {
			return options === undefined ?
				this :
				this.each(function( i ) {
					jQuery.offset.setOffset( this, options, i );
				});
		}

		var docElem, win,
			elem = this[ 0 ],
			box = { top: 0, left: 0 },
			doc = elem && elem.ownerDocument;

		if ( !doc ) {
			return;
		}

		docElem = doc.documentElement;

		// Make sure it's not a disconnected DOM node
		if ( !jQuery.contains( docElem, elem ) ) {
			return box;
		}

		// If we don't have gBCR, just use 0,0 rather than error
		// BlackBerry 5, iOS 3 (original iPhone)
		if ( typeof elem.getBoundingClientRect !== strundefined ) {
			box = elem.getBoundingClientRect();
		}
		win = getWindow( doc );
		return {
			top: box.top + win.pageYOffset - docElem.clientTop,
			left: box.left + win.pageXOffset - docElem.clientLeft
		};
	},

	position: function() {
		if ( !this[ 0 ] ) {
			return;
		}

		var offsetParent, offset,
			elem = this[ 0 ],
			parentOffset = { top: 0, left: 0 };

		// Fixed elements are offset from window (parentOffset = {top:0, left: 0}, because it is its only offset parent
		if ( jQuery.css( elem, "position" ) === "fixed" ) {
			// We assume that getBoundingClientRect is available when computed position is fixed
			offset = elem.getBoundingClientRect();

		} else {
			// Get *real* offsetParent
			offsetParent = this.offsetParent();

			// Get correct offsets
			offset = this.offset();
			if ( !jQuery.nodeName( offsetParent[ 0 ], "html" ) ) {
				parentOffset = offsetParent.offset();
			}

			// Add offsetParent borders
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}));

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},{"./toc":3,"jquery":1}],3:[function(require,module,exports){
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module.exports = {
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},{"jquery":1}]},{},[2]);
"></script>
</head>
<body>
<header class="hero">
<div class="container">
<div class="hero-text">
<h1 class="title">
The Type Astronaut’s Guide to Shapeless
</h1>
<h3 class="author">Dave Gurnell</h3>
<p class="date">January 2017</p>
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<p class="text-center">The Type Astronaut’s Guide to Shapeless</p>
<p class="text-center">Copyright 2016-17 Dave Gurnell.</p>
<p class="text-center">Published by <a href="http://underscore.io">Underscore Consulting LLP</a>, Brighton, UK.</p>
<hr>
<h1>Contents</h1>
<ul>
<li><a href="#avant-propos">Avant-propos</a></li>
<li><a href="#introduction"><span class="toc-section-number">1</span> Introduction</a><ul>
<li><a href="#la-programmation-générique-quest-ce-que-cest"><span class="toc-section-number">1.1</span> La programmation générique, qu’est-ce que c’est ?</a></li>
<li><a href="#sec:intro:about-this-book"><span class="toc-section-number">1.2</span> À propos du livre</a></li>
<li><a href="#sec:intro:source-code"><span class="toc-section-number">1.3</span> Code source et exemples</a></li>
<li><a href="#remerciements"><span class="toc-section-number">1.4</span> Remerciements</a></li>
</ul></li>
<li><a href="#sec:representations"><span class="toc-section-number">2</span> Type de données algébriques et représentation générique</a><ul>
<li><a href="#rappel-types-de-données-algébriques"><span class="toc-section-number">2.1</span> Rappel: types de données algébriques</a><ul>
<li><a href="#les-écritures-alternatives"><span class="toc-section-number">2.1.1</span> Les écritures alternatives</a></li>
</ul></li>
<li><a href="#écriture-générique-pour-les-produits"><span class="toc-section-number">2.2</span> Écriture générique pour les produits</a><ul>
<li><a href="#changer-de-représentation-en-utilisant-generic"><span class="toc-section-number">2.2.1</span> Changer de représentation en utilisant <em>Generic</em></a></li>
</ul></li>
<li><a href="#coproduit-générique"><span class="toc-section-number">2.3</span> Coproduit générique</a><ul>
<li><a href="#échanger-les-encodages-à-laide-de-generic"><span class="toc-section-number">2.3.1</span> Échanger les encodages à l’aide de <em>Generic</em></a></li>
</ul></li>
<li><a href="#résumé"><span class="toc-section-number">2.4</span> Résumé</a></li>
</ul></li>
<li><a href="#sec:generic"><span class="toc-section-number">3</span> Déduire automatiquement les instances de <em>type class</em></a><ul>
<li><a href="#sec:generic:type-classes"><span class="toc-section-number">3.1</span> Bref rappel : les type classes</a><ul>
<li><a href="#résoudre-les-instances"><span class="toc-section-number">3.1.1</span> Résoudre les instances</a></li>
<li><a href="#sec:generic:idiomatic-style"><span class="toc-section-number">3.1.2</span> Les définitions de <em>type class</em> idiomatique</a></li>
</ul></li>
<li><a href="#sec:generic:products"><span class="toc-section-number">3.2</span> Déduire des instances pour les produits</a><ul>
<li><a href="#les-instances-de-hlists"><span class="toc-section-number">3.2.1</span> Les instances de <em>HLists</em></a></li>
<li><a href="#sec:generic:product-generic"><span class="toc-section-number">3.2.2</span> Des instance pour nos produits</a></li>
<li><a href="#alors-quels-en-sont-les-inconvénients"><span class="toc-section-number">3.2.3</span> Alors quels en sont les inconvénients ?</a></li>
</ul></li>
<li><a href="#sec:generic:coproducts"><span class="toc-section-number">3.3</span> Déduire les instances pour les coproduits</a><ul>
<li><a href="#aligner-les-colonnes-dans-la-sortie-csv"><span class="toc-section-number">3.3.1</span> Aligner les colonnes dans la sortie CSV</a></li>
</ul></li>
<li><a href="#la-déduction-dinstance-pour-les-type-récursif."><span class="toc-section-number">3.4</span> La déduction d’instance pour les type récursif.</a><ul>
<li><a href="#les-divergences-dimplicits"><span class="toc-section-number">3.4.1</span> Les divergences d’implicits</a></li>
<li><a href="#lazy"><span class="toc-section-number">3.4.2</span> <em>Lazy</em></a></li>
</ul></li>
<li><a href="#sec:generic:debugging"><span class="toc-section-number">3.5</span> Débugger les résolutions d’implicites</a><ul>
<li><a href="#débugger-en-utilisant-implicitly"><span class="toc-section-number">3.5.1</span> Débugger en utilisant <em>implicitly</em></a></li>
<li><a href="#debugger-en-utilisant-reify"><span class="toc-section-number">3.5.2</span> Debugger en utilisant <em>reify</em></a></li>
</ul></li>
<li><a href="#en-résumé"><span class="toc-section-number">3.6</span> En résumé</a></li>
</ul></li>
<li><a href="#sec:type-level-programming"><span class="toc-section-number">4</span> Travailler avec les types et les implicites</a><ul>
<li><a href="#types-dépendants"><span class="toc-section-number">4.1</span> Types dépendants</a></li>
<li><a href="#sec:type-level-programming:depfun"><span class="toc-section-number">4.2</span> Fonctions à type dépendant</a></li>
<li><a href="#sec:type-level-programming:chaining"><span class="toc-section-number">4.3</span> Enchaîner les fonctions dépendantes</a></li>
<li><a href="#sec:type-level-programming:summary"><span class="toc-section-number">4.4</span> Résumé</a></li>
</ul></li>
<li><a href="#sec:labelled-generic"><span class="toc-section-number">5</span> Accéder aux noms durant la déduction d’<code>implicit</code></a><ul>
<li><a href="#types-littéreaux."><span class="toc-section-number">5.1</span> Types littéreaux.</a></li>
<li><a href="#sec:labelled-generic:type-tagging"><span class="toc-section-number">5.2</span> Le type tagging et les types fantômes</a><ul>
<li><a href="#records-et-labelledgeneric"><span class="toc-section-number">5.2.1</span> Records et <em>LabelledGeneric</em></a></li>
</ul></li>
<li><a href="#déduire-linstance-dun-produit-avec-labelledgeneric"><span class="toc-section-number">5.3</span> Déduire l’instance d’un produit avec <em>LabelledGeneric</em></a><ul>
<li><a href="#les-instances-de-hlists-1"><span class="toc-section-number">5.3.1</span> Les instances de <em>HLists</em></a></li>
<li><a href="#les-instances-pour-les-produits-concrêt."><span class="toc-section-number">5.3.2</span> Les instances pour les produits concrêt.</a></li>
</ul></li>
<li><a href="#déduire-les-instances-de-coproduits-avec-labelledgeneric"><span class="toc-section-number">5.4</span> Déduire les instances de coproduits avec <em>LabelledGeneric</em></a></li>
<li><a href="#résumé-1"><span class="toc-section-number">5.5</span> Résumé</a></li>
</ul></li>
<li><a href="#sec:ops"><span class="toc-section-number">6</span> Travailler avec <em>HLists</em> et <em>Coproducts</em></a><ul>
<li><a href="#exemple-dops-simples"><span class="toc-section-number">6.1</span> Exemple d’ops simples</a></li>
<li><a href="#sec:ops:penultimate"><span class="toc-section-number">6.2</span> Faire son propre op (le patterne “lemma”)</a></li>
<li><a href="#sec:ops:migration"><span class="toc-section-number">6.3</span> Étude de cas : migration de case class</a><ul>
<li><a href="#la-type-class"><span class="toc-section-number">6.3.1</span> La <em>type class</em></a></li>
<li><a href="#étape-1.-enlever-les-champs"><span class="toc-section-number">6.3.2</span> Étape 1. Enlever les champs</a></li>
<li><a href="#etape-2.-réordonner-les-champs"><span class="toc-section-number">6.3.3</span> Etape 2. Réordonner les champs</a></li>
<li><a href="#etape-3.-ajouter-de-nouveaux-champs"><span class="toc-section-number">6.3.4</span> Etape 3. Ajouter de nouveaux champs</a></li>
</ul></li>
<li><a href="#sec:ops:record"><span class="toc-section-number">6.4</span> Record ops</a><ul>
<li><a href="#sélectionner-les-champs"><span class="toc-section-number">6.4.1</span> Sélectionner les champs</a></li>
<li><a href="#mettre-à-jour-ou-enlever-des-champs"><span class="toc-section-number">6.4.2</span> Mettre à jour ou enlever des champs</a></li>
<li><a href="#convertir-en-une-map-conventionnelle"><span class="toc-section-number">6.4.3</span> Convertir en une <em>Map</em> conventionnelle</a></li>
<li><a href="#les-autres-opérations"><span class="toc-section-number">6.4.4</span> Les autres opérations</a></li>
</ul></li>
<li><a href="#résumé-2"><span class="toc-section-number">6.5</span> Résumé</a></li>
</ul></li>
<li><a href="#sec:poly"><span class="toc-section-number">7</span> Opération fonctionnelle sur les <em>HLists</em></a><ul>
<li><a href="#motivation-mapper-sur-une-hlist"><span class="toc-section-number">7.1</span> Motivation : mapper sur une <em>HList</em></a></li>
<li><a href="#fonctions-polymorphique"><span class="toc-section-number">7.2</span> Fonctions polymorphique</a><ul>
<li><a href="#comment-poly-fonctionne"><span class="toc-section-number">7.2.1</span> Comment <em>Poly</em> fonctionne</a></li>
<li><a href="#la-syntaxe-de-poly"><span class="toc-section-number">7.2.2</span> la syntaxe de <em>Poly</em></a></li>
</ul></li>
<li><a href="#mapping-et-flatmapping-à-laide-de-poly"><span class="toc-section-number">7.3</span> Mapping et flatMapping à l’aide de <em>Poly</em></a></li>
<li><a href="#utiliser-fold-avec-poly"><span class="toc-section-number">7.4</span> Utiliser Fold avec <em>Poly</em></a></li>
<li><a href="#sec:poly:product-mapper"><span class="toc-section-number">7.5</span> Définir une type classe utilisant <em>Poly</em></a></li>
<li><a href="#résumé-3"><span class="toc-section-number">7.6</span> Résumé</a></li>
</ul></li>
<li><a href="#sec:nat"><span class="toc-section-number">8</span> Compter avec les types</a><ul>
<li><a href="#représenter-des-nombres-par-des-types."><span class="toc-section-number">8.1</span> Représenter des nombres par des types.</a></li>
<li><a href="#la-longueur-des-représentations-génériques"><span class="toc-section-number">8.2</span> La longueur des représentations génériques</a></li>
<li><a href="#étude-de-cas-générateur-de-valeur-aléatoire"><span class="toc-section-number">8.3</span> Étude de cas: générateur de valeur aléatoire</a><ul>
<li><a href="#de-simples-valeurs-aléatoires"><span class="toc-section-number">8.3.1</span> De simples valeurs aléatoires</a></li>
<li><a href="#produits-aléatoires"><span class="toc-section-number">8.3.2</span> Produits aléatoires</a></li>
<li><a href="#coproduits-aléatoires"><span class="toc-section-number">8.3.3</span> Coproduits aléatoires</a></li>
</ul></li>
<li><a href="#les-autres-opérations-impliquant-nat"><span class="toc-section-number">8.4</span> Les autres opérations impliquant <em>Nat</em></a></li>
<li><a href="#résumé-4"><span class="toc-section-number">8.5</span> Résumé</a></li>
</ul></li>
<li><a href="#préparez-vous-au-lancement">Préparez-vous au lancement!</a></li>
</ul>
</div>
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<article>
<h1 id="avant-propos" class="unnumbered">Avant-propos</h1>
<p>Début 2011, alors que j’initiais mes travaux sur la programmation générique, qui aboutiront plus tard à <em>shapeless</em>, je n’aurais alors pas pensé que cinq ans plus tard, shapeless deviendrait une librairie autant utilisée. Je suis profondément reconnaissant envers les personnes qui ont cru en moi et qui ont ajouté shapeless à leurs dépendances. Le vote d’adhésion unanime est une source d’encouragements pour perserver dans tout projet <em>open source</em>. Je suis aussi reconnaissant envers les nombreuses personnes qui ont contribué à shapeless au fil des années, quatre-vingt-une au moment où j’écris ces lignes. Sans leur aide, shapeless serait une librairie bien moins intéressante.</p>
<p>Malgré ces points positifs, shapeless a souffert d’une carence qui caractérise les projets <em>open source</em> : le manque de documentation compréhensible, précise et accessible. La reponsabilité me revient en partie : bien que conscient de ce problème, je n’ai jamais trouvé le temps d’y remédier. Dans une certaine mesure, shapeless a été sauvé par le travail héroïque de Travis Brown sur Stack Overflow ainsi que par de nombreuses personnes qui ont organisé des conférences et des ateliers sur shapeless (notamment l’atelier <em>Shapeless for Mortals</em> de Sam Halliday).</p>
<p>Mais Dave Gurnell est parvenu à changer cela : nous disposons maintenant de ce superbe livre qui traite de manière approfondie de la partie la plus importante de shapeless : la déduction de <em>type class</em> par la programmation générique. Il a pour ainsi dire regroupé des fragments de folklore et de documentation, m’a poussé à la réflexion, et a transformé un enchevêtrement impénétrable en quelque chose de clair, concis et très concret. Avec un peu de chance, il sera capable de montrer comme j’essaie de le dire souvent qu’au fond shapeless est une librairie assez simple regroupant un ensemble de concepts tout aussi simples.</p>
<p>Merci Dave, tu nous rends à tous un grand service.</p>
<p>Miles Sabin<br />
Créateur de shapeless</p>
<h1 id="introduction"><span class="header-section-number">1</span> Introduction</h1>
<p>Ce livre est un guide d’utilisation de <a href="https://github.com/milessabin/shapeless"><em>shapeless</em></a>, une librairie de <em>programmation générique</em> en Scala. Shapeless est une vaste librairie ; plutôt que de tout couvrir, nous nous concentrerons sur quelques cas d’utilisation intéréssants, puis nous utiliserons ces derniers pour dresser un panorama des outils et patrons de conception existants.</p>
<p>Avant de commencer, disons deux mots sur la programmation générique et expliquons en quoi shapeless est intéressant pour les développeurs Scala.</p>
<h2 id="la-programmation-générique-quest-ce-que-cest"><span class="header-section-number">1.1</span> La programmation générique, qu’est-ce que c’est ?</h2>
<p>Les types sont utiles car ils sont spécifiques : ils nous aident a comprendre comment les différents morceaux de code s’imbriquent les uns aux autres, ils nous aident à éviter les bugs et nous conduisent vers une solution lorsque l’on code.</p>
<p>Pourtant, parfois, les types sont <em>trop</em> spécifiques. Il y a des situations où l’on veut pouvoir profiter des similarités entres les types pour éviter les répétitions. Considérons par exemple les définitions suivantes :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">case</span> <span class="kw">class</span> <span class="fu">Employee</span>(name: String, number: Int, manager: Boolean)
<span class="kw">case</span> <span class="kw">class</span> <span class="fu">IceCream</span>(name: String, numCherries: Int, inCone: Boolean)</code></pre></div>
<p>Ces deux <em>case classes</em> représentent des données différentes mais elles on des points communs évidents : elles possèdent toutes deux des champs du même type. Supposons que nous voulons implémenter une opération générique, par exemple les sérialiser en un fichier CSV. En dépit des similarités, nous devons écrire une méthode de sérialisation pour chaque type :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">def</span> <span class="fu">employeeCsv</span>(e: Employee): List[String] =
List(e.<span class="fu">name</span>, e.<span class="fu">number</span>.<span class="fu">toString</span>, e.<span class="fu">manager</span>.<span class="fu">toString</span>)
<span class="kw">def</span> <span class="fu">iceCreamCsv</span>(c: IceCream): List[String] =
List(c.<span class="fu">name</span>, c.<span class="fu">numCherries</span>.<span class="fu">toString</span>, c.<span class="fu">inCone</span>.<span class="fu">toString</span>)</code></pre></div>
<p>La programmation générique consiste à venir à bout de ce genre de différences. Shapeless met a disposition un moyen pratique de convertir des types spécifiques en une représentation générique, qui sont ensuite manipulables avec un code commun.</p>
<p>Par exemple, nous pouvons utiliser le code suivant pour convertir les <code>Employee</code> et les <code>IceCream</code> en valeurs du même type. Ne vous inquiétez pas si vous ne comprenez pas encore cet exemple, ce sujet sera traité plus tard.</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless._</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> genericEmployee = Generic[Employee].<span class="fu">to</span>(<span class="fu">Employee</span>(<span class="st">"Dave"</span>, <span class="dv">123</span>, <span class="kw">false</span>))
<span class="co">// genericEmployee: shapeless.::[String,shapeless.::[Int,shapeless.::[Boolean,shapeless.HNil]]] = Dave :: 123 :: false :: HNil</span>
<span class="kw">val</span> genericIceCream = Generic[IceCream].<span class="fu">to</span>(<span class="fu">IceCream</span>(<span class="st">"Sundae"</span>, <span class="dv">1</span>, <span class="kw">false</span>))
<span class="co">// genericIceCream: shapeless.::[String,shapeless.::[Int,shapeless.::[Boolean,shapeless.HNil]]] = Sundae :: 1 :: false :: HNil</span></code></pre></div>
<p>Les deux valeurs sont maintenant du même type. Elle sont toutes les deux des listes hétérogènes (des <code>HList</code>s) contenant une <code>String</code>, un <code>Int</code>, et un <code>Boolean</code>. Nous jetterons bientôt un œil aux <code>HList</code>s et à l’importance de leur rôle. Pour l’instant, le plus intéressant est que nous pouvons sérialiser chaque valeur avec une seule fonction.</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">def</span> <span class="fu">genericCsv</span>(gen: String :: Int :: Boolean :: HNil): List[String] =
List(<span class="fu">gen</span>(<span class="dv">0</span>), <span class="fu">gen</span>(<span class="dv">1</span>).<span class="fu">toString</span>, <span class="fu">gen</span>(<span class="dv">2</span>).<span class="fu">toString</span>)</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">genericCsv</span>(genericEmployee)
<span class="co">// res2: List[String] = List(Dave, 123, false)</span>
<span class="fu">genericCsv</span>(genericIceCream)
<span class="co">// res3: List[String] = List(Sundae, 1, false)</span></code></pre></div>
<p>Cet exemple est basique mais il pointe du doigt la nature de la programmation générique. Nous reformulons les problèmes pour pouvoir les résoudre avec des constructions génériques et ainsi écrire de petit bloc de code qui fonctionne avec une large variété de types. Programmer avec shapeless nous permet d’éliminer une grande quantité de code <em>boilerplate</em>, de rendre les applications Scala plus faciles à lire, écrire et maintenir.</p>
<p>Votre curiosité a été piquée ? Alors c’est parti !</p>
<h2 id="sec:intro:about-this-book"><span class="header-section-number">1.2</span> À propos du livre</h2>
<p>Le livre est divisé en deux parties.</p>
<p>La <em>Partie I</em> introduit la déduction de <em>type class</em> (<em>type class derivation</em>), notion permettant de créer des instances de <em>type class</em> pour tous les types de données algébriques à partir de quelques règles génériques uniquement. La <em>Partie I</em> comprend quatre chapitres :</p>
<ul>
<li><p>Le <em>Chapitre 2</em> introduit les <em>generic representations</em>, mais aussi la <em>type class</em> <code>Generic</code> de shapeless, qui permet de produire un encodage générique de n’importe quelle <em>case class</em> ou <em>sealed trait</em>.</p></li>
<li><p>Le <em>Chapitre 3</em> utilise <code>Generic</code> pour déduire des instances d’une <em>type class</em> particulière. On créé un exemple de <em>type class</em> pour encoder des données Scala en <em>Comma Separated Values</em> (<em>CSV</em>), mais la technique utilisée peut être adaptée à de nombreuses situations. Le type <code>Lazy</code> de shapeless est également présenté, il permet de manipuler les types de données récursives comme les listes ou les arbres.</p></li>
<li><p>Le <em>Chapitre 4</em> présente la théorie et les patrons de conception nécessaires à la généralisation des techniques du chapitre précédent. On se penchera sur les types dépendants, les fonctions à type dépendant et la programmation au <em>type level</em>. C’est l’occasion d’utiliser des applications plus avancées de shapeless.</p></li>
<li><p>Le <em>Chapitre 5</em> présente <code>LabelledGeneric</code>, une variante de <code>Generic</code> qui divulgue les champs et les noms des types dans sa représentation générique. Davantages d’éléments théoriques sont donnés sur les <em>types littéraux</em>, les <em>types singletons</em>, les <em>types fantômes</em> et les <em>type tagging</em>. <code>LabelledGeneric</code> est illustré en créant un encodeur <em>JSON</em> qui préserve les champs et les noms des types dans sa sortie.</p></li>
</ul>
<p>La <em>Partie II</em> présente les <em>ops type classes</em> fournies dans le package <code>shapeless.ops</code>. Les <em>ops type classes</em> comprennent une gamme d’outils permettant de manipuler les représentations génériques. Plutôt que d’expliquer en détails chaque <code>op</code>, une synthèse théorique est réalisée en trois chapitres :</p>
<ul>
<li><p>Le <em>Chapitre 6</em> discute d’une présentation générale des <code>ops</code> <em>type classes</em> et fournit un exemple qui regroupe plusieurs <code>ops</code> pour former un puissant outil de « migration de case class ».</p></li>
<li><p>Le <em>Chapitre 7</em> présente <em>les fonctions polymorphiques</em>, également connues sous le nom de <code>Polys</code>, et montre comment les utiliser dans les <code>ops</code> <em>type classes</em> pour <em>mapper</em>, <em>flat mapper</em> et <em>folder</em> les représentations génériques.</p></li>
<li><p>Enfin, le Chapitre 8 présente le type <code>Nat</code> que shapeless utilise pour représenter les nombres naturels au <em>type level</em>. Plusieurs <code>ops</code> <em>type classes</em> associés sont présentés, et <code>Nat</code> est utilisé pour développer notre propre version de <code>Arbitrary</code> de <em>Scalacheck</em>.</p></li>
</ul>
<h2 id="sec:intro:source-code"><span class="header-section-number">1.3</span> Code source et exemples</h2>
<p>Ce livre est <em>open source</em>. Vous pouvez trouver <a href="https://github.com/underscoreio/shapeless-guide">les sources Markdown sur GitHub</a>. La communauté met constamment à jour ce livre, veillez donc à vérifier sur le dépôt GitHub que vous disposez de la dernière version.</p>
<p>Une copie du livre est également maintenue sur <a href="https://underscore.io/books/shapeless-guide">le site <em>web</em> Underscore</a>. En récupérant votre copie sur ce site, vous pourrez être également prévenus de la sortie d’une mise à jour.</p>
<p>Il y existe aussi des implémentations complètes des exemples principaux dans un <a href="https://github.com/underscoreio/shapeless-guide-code">dépôt annexe</a>. Consultez le README pour plus de détails sur l’installation. Les exemples utilisent <em>shapeless 2.3.2</em> et <em>Typelevel Scala 2.11.8+</em> ou <em>Lightbend Scala 2.11.9+ / 2.12.1+</em>.</p>
<p>La plupart des exemples de ce livre ont été compilés et exécutés avec la version 2.12.1 du compilateur <em>Typelevel Scala</em>. Entre autres, cette version de Scala dispose de l’impression de <em>type infix</em>, avec une sortie du <em>REPL</em> dans la console plus claire :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> repr = <span class="st">"Hello"</span> :: <span class="dv">123</span> :: <span class="kw">true</span> :: HNil
<span class="co">// repr: shapeless.::[String,shapeless.::[Int,shapeless.::[Boolean,shapeless.HNil]]] = Hello :: 123 :: true :: HNil</span></code></pre></div>
<p>Si vous utilisez une version antérieure de Scala vous devrez utiliser l’impression de <em>type prefix</em> ainsi :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> repr = <span class="st">"Hello"</span> :: <span class="dv">123</span> :: <span class="kw">true</span> :: HNil
<span class="co">// repr: shapeless.::[String,shapeless.::[Int,shapeless.::[Boolean,shapeless.HNil]]] = "Hello" :: 123 :: true :: HNil</span></code></pre></div>
<p>Pas de panique ! Mise à part la manière d’afficher le résultat (syntaxe <em>infix</em> contre <em>prefix</em>), ces types sont les mêmes. Si vous trouvez les <em>prefix types</em> difficiles à lire, nous vous recommendons de mettre à jour Scala. Ajoutez simplement ceci au fichier <code>build.sbt</code>, ou remplacez le numéro de version de manière appropriée :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">scalaOrganization := <span class="st">"org.typelevel"</span>
scalaVersion := <span class="st">"2.12.1"</span></code></pre></div>
<p>Le paramètre <code>scalaOrganization</code> n’est supporté que dans <em>sbt 0.13.13</em> ou supérieur. Vous pouvez spécifier une version <em>sbt</em> en écrivant ceci dans <code>project/build.properties</code> (crééz le fichier si il n’est pas déjà dans votre projet) :</p>
<pre><code>sbt.version=0.13.13</code></pre>
<h2 id="remerciements"><span class="header-section-number">1.4</span> Remerciements</h2>
<p>Je remercie Miles Sabin, Richard Dallaway, Noel Welsh et Travis Brown pour leur contribution inestimable.</p>
<p>Je remercie tout particulièrement à Sam Halliday pour son excellent atelier <a href="http://fommil.com/scalax15/"><em>Shapeless for Mortals</em></a>, qui a inspiré et structuré le présent exposé, et Rob Norris et ses contributeurs pour le très pratique <a href="https://github.com/tpolecat/tut">Tut</a>, qui s’assure les exemples du livre compilent correctement.</p>
<p>Si vous constatez qu’il y a des erreurs ou si vous voyez des améliorations potentielles, n’hésitez pas à remonter une <em>issue</em> ou à nous soumettre une <em>pull request</em> sur la <a href="https://github.com/underscoreio/shapeless-guide">page GitHub</a>.</p>
<h1 id="sec:representations"><span class="header-section-number">2</span> Type de données algébriques et représentation générique</h1>
<p>La programmation générique a pour objectif principal de résoudre des problèmes pour une grande variété de types en utilisant un minimum de code générique. Shapeless fournit deux ensembles d’outils dans ce but :</p>
<ol style="list-style-type: decimal">
<li><p>Un ensemble de types de donnée générique qui peuvent être inspectés, itérés et manipulés au <code>type-level</code></p></li>
<li><p>Le mapping automatique entre <em>algebraic data types (</em>ADT<em>s)</em> (encodé en Scala par les <em>case classes</em> et les <em>sealed traits</em>) et leurs représentations génériques.</p></li>
</ol>
<p>Dans ce chapitre, nous commençons par un récapitulatif sur la théorie des types alébriques et la raison pour laquelle ils peuvent être familiers pour le développeur Scala. Puis, nous verrons les représentations génériques utilisées par shapeless et nous traiterons de la façon dont ils sont reliés aux <em>ADT</em>s concrets. Enfin, nous présenterons une type class appelée <code>Generic</code> qui fournit un mapping automatique bidirectionnel entre un <em>ADT</em> et sa représentation générique. Enfin, nous utiliserons <code>Generic</code> dans quelques exemples pour convertir des valeurs d’un type vers un autre.</p>
<h2 id="rappel-types-de-données-algébriques"><span class="header-section-number">2.1</span> Rappel: types de données algébriques</h2>
<p><em>Algebraic data types (</em>ADT<em>s)</em><a href="#fn1" class="footnoteRef" id="fnref1"><sup>1</sup></a> est un nom raffiné qui cache un concept très simple. C’est un moyen idiomatique de représenter une donnée en utilisant les « et » et « ou » logiques. Par exemple :</p>
<ul>
<li>une forme est un rectangle <strong>ou</strong> un cercle</li>
<li>un rectangle a une largeur <strong>et</strong> une hauteur</li>
<li>un cercle a un rayon</li>
</ul>
<p>Dans la terminologie des <em>ADT</em>s, les types « et » comme le rectangle et le cercle sont appelés <em>products (produits)</em>, les types « ou » comme le type forme sont appelés <em>coproducts (coproduits)</em>. En Scala, nous représentons typiquement les produits par des case class et les coproduits par des sealed traits :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">sealed</span> <span class="kw">trait</span> Shape
<span class="kw">final</span> <span class="kw">case</span> <span class="kw">class</span> Rectangle(width: Double, height: Double) <span class="kw">extends</span> Shape
<span class="kw">final</span> <span class="kw">case</span> <span class="kw">class</span> <span class="fu">Circle</span>(radius: Double) <span class="kw">extends</span> Shape
<span class="kw">val</span> rect: Shape = Rectangle(<span class="fl">3.0</span>, <span class="fl">4.0</span>)
<span class="kw">val</span> circ: Shape = <span class="fu">Circle</span>(<span class="fl">1.0</span>)</code></pre></div>
<p>Ce qui est beau avec les <em>ADT</em>s, c’est qu’ils sont complètement type safe. Le compilateur a une connaisence complète de l’algèbre<a href="#fn2" class="footnoteRef" id="fnref2"><sup>2</sup></a> que nous définissons, il peut donc nous aider à écrire des méthodes correctement typées avec nos types.</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">def</span> <span class="fu">area</span>(shape: Shape): Double =
shape <span class="kw">match</span> {
<span class="kw">case</span> Rectangle(w, h) => w * h
<span class="kw">case</span> <span class="fu">Circle</span>(r) => math.<span class="fu">Pi</span> * r * r
}</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">area</span>(rect)
<span class="co">// res1: Double = 12.0</span>
<span class="fu">area</span>(circ)
<span class="co">// res2: Double = 3.141592653589793</span></code></pre></div>
<h3 id="les-écritures-alternatives"><span class="header-section-number">2.1.1</span> Les écritures alternatives</h3>
<p>Les sealed traits et les <em>case classes</em> sont sans aucun doute les encodages les plus pratique des <em>ADT</em>s en Scala. Mais ce ne sont pas les <em>seules</em> possibilités d’encodage. Par exemple, la librairie standard de Scala fournit des produits génériques appelés <code>Tuples</code> ainsi qu’un coproduit générique : <code>Either</code>. Nous aurions pu choisir d’écrire notre <code>Shape</code> comme suit :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">type</span> Rectangle2 = (Double, Double)
<span class="kw">type</span> Circle2 = Double
<span class="kw">type</span> Shape2 = Either[Rectangle2, Circle2]
<span class="kw">val</span> rect2: Shape2 = <span class="fu">Left</span>((<span class="fl">3.0</span>, <span class="fl">4.0</span>))
<span class="kw">val</span> circ2: Shape2 = <span class="fu">Right</span>(<span class="fl">1.0</span>)</code></pre></div>
<p>Bien que cette écriture soit moins lisible que la précédente avec des case class, elle dispose de certaines des propriétés requises. Nous pouvons toujours écrire du code type safe avec <code>Shape2</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">def</span> <span class="fu">area2</span>(shape: Shape2): Double =
shape <span class="kw">match</span> {
<span class="kw">case</span> <span class="fu">Left</span>((w, h)) => w * h
<span class="kw">case</span> <span class="fu">Right</span>(r) => math.<span class="fu">Pi</span> * r * r
}</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">area2</span>(rect2)
<span class="co">// res4: Double = 12.0</span>
<span class="fu">area2</span>(circ2)
<span class="co">// res5: Double = 3.141592653589793</span></code></pre></div>
<p>Il est important de noter que <code>Shape2</code> est une écriture plus <em>générique</em> que <code>Shape</code><a href="#fn3" class="footnoteRef" id="fnref3"><sup>3</sup></a>. Tout code qui fonctionne avec une paire de <code>Doubles</code> fonctionnera avec <code>Rectangle2</code> et vice versa. En tant que développeur Scala nous avons tendance à préférer les types sémantiques comme <code>Rectangle</code> et <code>Circle</code> aux types génériques tels que <code>Rectangle2</code> et <code>Circle2</code>, précisément à cause de leur nature spécialisée. Toutefois, dans certain cas, la généralité est préférable. Par exemple, si l’on sérialise des données sur un disque, nous ne nous soucions pas des différences entre une paire de <code>Doubles</code> et un <code>Rectangle2</code>. On écrit seulement les nombres et rien d’autre.</p>
<p>Shapeless nous donne le meilleur des deux mondes ; nous pouvons utiliser les types sémantiques par défaut et passer aux représentations génériques lorsque le besoin d’interopérabilité se fait sentir (nous y reviendrons).</p>
<p>En revanche, au lieu d’utiliser <code>Tuples</code> et <code>Either</code>, shapeless utilise son propre type de données pour représenter les produits et coproduits génériques. Nous présenterons ces types dans la section suivante.</p>
<h2 id="écriture-générique-pour-les-produits"><span class="header-section-number">2.2</span> Écriture générique pour les produits</h2>
<p>Dans la section précédente, nous avons présenté les <em>tuples</em> comme une représentation générique des produits. Malheureusement, les <em>tuples</em> présentent deux inconvénients qui les rendent inappropriés aux besoins de shapeless.</p>
<ol style="list-style-type: decimal">
<li><p>Chaque taille de tuple est dotée d’un type différent, ces types sont indépendants les uns des autres, ce qui rend difficile l’écriture de code qui fait abstraction de la taille des produits.</p></li>
<li><p>Il n’existe pas de <em>tuples</em> de taille zero, qui sont pourtant importants pour représenter les produits sans champ. On pourrait utiliser <code>Unit</code>, mais on souhaite que chaque représentation générique ait un supertype commun et tangible. Le plus petit ancêtre commun à <code>Unit</code> et <code>Tuple2</code> est <code>Any</code>, une combinaison des deux est donc impensable.</p></li>
</ol>
<p>C’est pourquoi shapeless utilise un encodage générique différent pour les produits : <em>heterogeneous lists</em> ou <code>HList</code>s<a href="#fn4" class="footnoteRef" id="fnref4"><sup>4</sup></a>.</p>
<p>La <code>HList</code> est soit une liste vide <code>HNil</code>, soit une paire <code>::[H, T]</code> où <code>H</code> est un type arbitraire et <code>T</code> une autre <code>HList</code>. Parce que chaque <code>::</code> a son propre <code>H</code> et <code>T</code>, le type de chaque élément est encodé séparément dans le type de la liste global:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless.{HList, ::, HNil}
<span class="kw">val</span> product: String :: Int :: Boolean :: HNil =
<span class="st">"Sunday"</span> :: <span class="dv">1</span> :: <span class="kw">false</span> :: HNil</code></pre></div>
<p>Le type et la valeur de la <code>HList</code> ci-dessus se reflètent. Les deux représentent les 3 membres : une <code>String</code>, un <code>Int</code>, et un <code>Boolean</code>. On peut y retrouver la <code>tête</code> et la <code>queue</code>, et le type des éléments y est préservé :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> first = product.<span class="fu">head</span>
<span class="co">// first: String = Sunday</span>
<span class="kw">val</span> second = product.<span class="fu">tail</span>.<span class="fu">head</span>
<span class="co">// second: Int = 1</span>
<span class="kw">val</span> rest = product.<span class="fu">tail</span>.<span class="fu">tail</span>
<span class="co">// rest: shapeless.::[Boolean,shapeless.HNil] = false :: HNil</span></code></pre></div>
<p>Le compilateur connaît la taille exacte de chaque <code>HList</code>, cela devient donc une erreur de compilation de demander la <code>tête</code> ou la <code>queue</code> d’une liste vide :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">product.<span class="fu">tail</span>.<span class="fu">tail</span>.<span class="fu">tail</span>.<span class="fu">head</span>
<span class="co">// <console>:15: error: could not find implicit value for parameter c: shapeless.ops.hlist.IsHCons[shapeless.HNil]</span>
<span class="co">// product.tail.tail.tail.head</span>
<span class="co">// ^</span></code></pre></div>
<p>En plus de pouvoir inspecter et itérer sur les <code>HList</code>s, on peut les manipuler et les transformer. Par exemple, on peut ajouter un élément avec la méthode <code>::</code>. Encore une fois, notez comme le type du résultat reflète le nombre des éléments de la liste.</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> newProduct: Long :: String :: Int :: Boolean :: HNil =
42L :: product</code></pre></div>
<p>Shapeless fournit aussi des outils pour effectuer des opérations plus complexes comme un mapping, un filtrage ou une concaténation de listes. On abordera cela plus en détails dans la <em>Partie II</em>.</p>
<p>Les propriétés que l’on obtient avec <code>HList</code>s ne sont pas magiques. On aurait pu obtenir ces fonctionalités en utilisant <code>(A, B)</code> et <code>Unit</code> comme alternative à <code>::</code> et <code>HNil</code>. Néanmoins, il existe un avantage à garder nos types génériques séparés de nos types sémantiques dans les applications. <code>HList</code> fournit cette séparation.</p>
<h3 id="changer-de-représentation-en-utilisant-generic"><span class="header-section-number">2.2.1</span> Changer de représentation en utilisant <em>Generic</em></h3>
<p>Shapeless fournit une type class appelée <code>Generic</code> qui permet de convertir des <em>ADT</em> concrets en représentation générique et vice versa. Il y a quelques macros en coulisses qui permettent d’invoquer des instances de <code>Generic</code> sans code <em>boilerplate</em> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless.<span class="fu">Generic</span>
<span class="kw">case</span> <span class="kw">class</span> <span class="fu">IceCream</span>(name: String, numCherries: Int, inCone: Boolean)</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> iceCreamGen = Generic[IceCream]
<span class="co">// iceCreamGen: shapeless.Generic[IceCream]{type Repr = shapeless.::[String,shapeless.::[Int,shapeless.::[Boolean,shapeless.HNil]]]} = anon$macro$4$1@2db79572</span></code></pre></div>
<p>Notez que les instance de <code>Generic</code> ont un membre de type <code>Repr</code> qui contient le type de sa représentation générique. Dans notre cas <code>iceCreamGen.Repr</code> est <code>String :: Int :: Boolean :: HNil</code>. Les instances de <code>Generic</code> disposent de deux méthodes : Une pour convertir vers le type <code>Repr</code> appelé <code>to</code> et la méthode inverse <code>from</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> iceCream = <span class="fu">IceCream</span>(<span class="st">"Sundae"</span>, <span class="dv">1</span>, <span class="kw">false</span>)
<span class="co">// iceCream: IceCream = IceCream(Sundae,1,false)</span>
<span class="kw">val</span> repr = iceCreamGen.<span class="fu">to</span>(iceCream)
<span class="co">// repr: iceCreamGen.Repr = Sundae :: 1 :: false :: HNil</span>
<span class="kw">val</span> iceCream2 = iceCreamGen.<span class="fu">from</span>(repr)
<span class="co">// iceCream2: IceCream = IceCream(Sundae,1,false)</span></code></pre></div>
<p>On peut convertir de l’un vers l’autre deux <em>ADT</em>s qui ont le même <code>Repr</code> en utilisant leurs <code>Generics</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">case</span> <span class="kw">class</span> <span class="fu">Employee</span>(name: String, number: Int, manager: Boolean)</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="co">// Create an employee from an ice cream:</span>
<span class="kw">val</span> employee = Generic[Employee].<span class="fu">from</span>(Generic[IceCream].<span class="fu">to</span>(iceCream))
<span class="co">// employee: Employee = Employee(Sundae,1,false)</span></code></pre></div>
<div class="callout callout-info">
<p><em>Les autres types de produits</em></p>
<p>Il vaut la peine de souligner que les <em>tuples Scala</em> sont des <em>case classes</em>, donc <code>Generic</code> fonctionne très bien avec :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> tupleGen = Generic[(String, Int, Boolean)]
tupleGen.<span class="fu">to</span>((<span class="st">"Hello"</span>, <span class="dv">123</span>, <span class="kw">true</span>))
<span class="co">// res4: tupleGen.Repr = Hello :: 123 :: true :: HNil</span>
tupleGen.<span class="fu">from</span>(<span class="st">"Hello"</span> :: <span class="dv">123</span> :: <span class="kw">true</span> :: HNil)
<span class="co">// res5: (String, Int, Boolean) = (Hello,123,true)</span></code></pre></div>
<p>Cela marche aussi avec les <em>case classes</em> de plus de 22 champs:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">case</span> <span class="kw">class</span> <span class="fu">BigData</span>(
a:Int,b:Int,c:Int,d:Int,e:Int,f:Int,g:Int,h:Int,i:Int,j:Int,
k:Int,l:Int,m:Int,n:Int,o:Int,p:Int,q:Int,r:Int,s:Int,t:Int,
u:Int,v:Int,w:Int)
Generic[BigData].<span class="fu">from</span>(Generic[BigData].<span class="fu">to</span>(<span class="fu">BigData</span>(
<span class="dv">1</span>,<span class="dv">2</span>,<span class="dv">3</span>,<span class="dv">4</span>,<span class="dv">5</span>,<span class="dv">6</span>,<span class="dv">7</span>,<span class="dv">8</span>,<span class="dv">9</span>,<span class="dv">10</span>,<span class="dv">11</span>,<span class="dv">12</span>,<span class="dv">13</span>,<span class="dv">14</span>,<span class="dv">15</span>,<span class="dv">16</span>,<span class="dv">17</span>,<span class="dv">18</span>,<span class="dv">19</span>,<span class="dv">20</span>,<span class="dv">21</span>,<span class="dv">22</span>,<span class="dv">23</span>)))
<span class="co">// res6: BigData = BigData(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23)</span></code></pre></div>
</div>
<h2 id="coproduit-générique"><span class="header-section-number">2.3</span> Coproduit générique</h2>
<p>Maintenant que nous savons comment Shapeless encode les types produit, qu’en est-il des coproduits ? Précédemment, nous avons abordé le <code>Either</code>, mais il souffre des mêmes inconvénients que les <em>tuples</em>. Encore une fois, shapeless fournit son propre encodage, similaire au <code>HList</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless.{Coproduct, :+:, CNil, Inl, Inr}
<span class="kw">case</span> <span class="kw">class</span> <span class="fu">Red</span>()
<span class="kw">case</span> <span class="kw">class</span> <span class="fu">Amber</span>()
<span class="kw">case</span> <span class="kw">class</span> <span class="fu">Green</span>()
<span class="kw">type</span> Light = Red :+: Amber :+: Green :+: CNil</code></pre></div>
<p>En général, les coproduits prennent la forme de <code>A :+: B :+: C :+: CNil</code> signifiant « A ou B ou C, » où <code>:+:</code> peut être librement interprété comme <code>Either</code>. Globalement, le type d’un coproduit encode tous les types possibles d’une disjonction, mais ces instances contiennent uniquement la valeur de l’une des possibilités. <code>:+:</code> dispose de deux sous types, <code>Inl</code> et <code>Inr</code>, qui correspondent vagument à <code>Left</code> et <code>Right</code>. On crée des instances de coproduit en imbriquant des constructeurs de <code>Inl</code> et de <code>Inr</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> red: Light = <span class="fu">Inl</span>(<span class="fu">Red</span>())
<span class="co">// red: Light = Inl(Red())</span>
<span class="kw">val</span> green: Light = <span class="fu">Inr</span>(<span class="fu">Inr</span>(<span class="fu">Inl</span>(<span class="fu">Green</span>())))
<span class="co">// green: Light = Inr(Inr(Inl(Green())))</span></code></pre></div>
<p>Chaque type de coproduit se termine par <code>CNil</code>, qui est un type inhabité (sans valeur), similaire à <code>Nothing</code>. On ne peut donc pas instancier <code>CNil</code> ou construire un <code>Coproduct</code> uniquement à partir d’instance de <code>Inr</code>. Il y a toujours exactement un <code>Inl</code> dans chaque valeur de coproduit.</p>
<p>Encore une fois, il convient de signaler que <code>Coproduct</code>s n’a rien de spécial. La fonctionnalité du dessus peut être obtenue en utilisant <code>Either</code> et <code>Nothing</code> à la place de <code>:+:</code> et <code>CNil</code>. Utiliser <code>Nothing</code> induit des difficultés techniques, mais on aurait pu utiliser n’importe quel autre type inhabité ou type singleton à la place de <code>CNil</code>.</p>
<h3 id="échanger-les-encodages-à-laide-de-generic"><span class="header-section-number">2.3.1</span> Échanger les encodages à l’aide de <em>Generic</em></h3>
<p>À première vue, les <code>Coproduct</code> sont difficiles à parser. Cependant, nous voyons comment ils s’intègrent dans le contexte plus large des écritures génériques. En plus de comprendre les <em>case classes</em> et les <em>case objects</em>, <code>Generic</code> de shapeless comprend également les <em>sealed traits</em> et les classes abstraites :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless.<span class="fu">Generic</span>
<span class="kw">sealed</span> <span class="kw">trait</span> Shape
<span class="kw">final</span> <span class="kw">case</span> <span class="kw">class</span> Rectangle(width: Double, height: Double) <span class="kw">extends</span> Shape
<span class="kw">final</span> <span class="kw">case</span> <span class="kw">class</span> <span class="fu">Circle</span>(radius: Double) <span class="kw">extends</span> Shape</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> gen = Generic[Shape]
<span class="co">// gen: shapeless.Generic[Shape]{type Repr = shapeless.:+:[Rectangle,shapeless.:+:[Circle,shapeless.CNil]]} = anon$macro$1$1@1d254277</span></code></pre></div>
<p>Le <code>Repr</code> du <code>Generic</code> de <code>Shape</code> est un coproduit des sous-types de <code>Shape</code>: <code>Rectangle :+: Circle :+: CNil</code>. On peut utiliser les méthodes <code>to</code> et <code>from</code> de l’instance de <code>Generic</code> pour convertir <code>Shape</code> en <code>gen.Repr</code> et vice versa :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">gen.<span class="fu">to</span>(Rectangle(<span class="fl">3.0</span>, <span class="fl">4.0</span>))
<span class="co">// res3: gen.Repr = Inl(Rectangle(3.0,4.0))</span>
gen.<span class="fu">to</span>(<span class="fu">Circle</span>(<span class="fl">1.0</span>))
<span class="co">// res4: gen.Repr = Inr(Inl(Circle(1.0)))</span></code></pre></div>
<h2 id="résumé"><span class="header-section-number">2.4</span> Résumé</h2>
<p>Dans ce chapitre, nous avons abordé les représentations génériques que Shapeless fournit pour les types de données algébriques de Scala. <code>HList</code>s pour les types produits et <code>Coproduct</code>s pour les types coproduits. Nous avons aussi présenté la <em>type class</em> <code>Generic</code> qui fournit mapping bidirectionnel entre un <em>ADT</em> et sa représentation générique. Nous n’avons pas encore abordé ce qui rend les écritures génériques si attractives. Le cas d’utilisation que nous avons couvert (conversion entre <em>ADT</em>s) est amusant mais pas particulièrement utile.</p>
<p>La vraie puissance de <code>HList</code>s et de <code>Coproduct</code>s provient de leur structure récursive. On peut écrire du code qui traverse leur représentation et calcule des valeurs à partir des éléments qui les constituent. Dans le prochain chapitre nous verrons notre premier véritable cas d’utilisation : la déduction automatique d’instance de <em>type class</em>es.</p>
<h1 id="sec:generic"><span class="header-section-number">3</span> Déduire automatiquement les instances de <em>type class</em></h1>
<p>Dans le dernier chapitre, nous avons vu comment le type <code>Generic</code> nous permet de convertir toute instance d’un <em>ADT</em> en un encodage générique composé de <code>HList</code>s et <code>Coproduct</code>s. Dans ce chapitre, nous verrons notre premier véritable cas d’utilisation : la déduction automatique d’instances de <em>type class</em>.</p>
<h2 id="sec:generic:type-classes"><span class="header-section-number">3.1</span> Bref rappel : les type classes</h2>
<p>Avant d’entrer dans les détails de la déduction d’instance, faisons un bref rappel des aspects importants des <em>types classes</em>.</p>
<p>Les type classes sont un pattern de programmation emprunté à <em>Haskell</em> (le mot « classe » n’a rien a voir avec les classes de la programmation orientée object). Nous les écrivons en Scala avec des traits et des implicites. Une <em>type class</em> est un trait paramétré représentant une fonctionalité générale que l’on voudrait appliquer à une grande variété de types :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="co">// Turn a value of type A into a row of cells in a CSV file:</span>
<span class="kw">trait</span> CsvEncoder[A] {
<span class="kw">def</span> <span class="fu">encode</span>(value: A): List[String]
}</code></pre></div>
<p>On implémente notre type class avec une <em>instance</em> pour chaque type visé. Si nous voulons avoir l’instance dans le scope automatiquement, on peut les placer dans l’objet compagnon de la <em>type class</em>. Sinon, on peut les placer dans une objet séparé qui fera office de bibliothèque et que l’utilisateur pourra importer manuellement :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="co">// Custom data type:</span>
<span class="kw">case</span> <span class="kw">class</span> <span class="fu">Employee</span>(name: String, number: Int, manager: Boolean)
<span class="co">// CsvEncoder instance for the custom data type:</span>
<span class="kw">implicit</span> <span class="kw">val</span> employeeEncoder: CsvEncoder[Employee] =
<span class="kw">new</span> CsvEncoder[Employee] {
<span class="kw">def</span> <span class="fu">encode</span>(e: Employee): List[String] =
List(
e.<span class="fu">name</span>,
e.<span class="fu">number</span>.<span class="fu">toString</span>,
<span class="kw">if</span>(e.<span class="fu">manager</span>) <span class="st">"yes"</span> <span class="kw">else</span> <span class="st">"no"</span>
)
}</code></pre></div>
<p>On marque chaque instance avec le mot clé <code>implicit</code>, et on définit une ou plusieurs méthodes qui acceptent le paramètre implicite du type de notre type class, elles feront office de point d’entrée :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">def</span> writeCsv[A](values: List[A])(<span class="kw">implicit</span> enc: CsvEncoder[A]): String =
values.<span class="fu">map</span>(value => enc.<span class="fu">encode</span>(value).<span class="fu">mkString</span>(<span class="st">","</span>)).<span class="fu">mkString</span>(<span class="st">"</span><span class="ch">\n</span><span class="st">"</span>)</code></pre></div>
<p>Testons <code>writeCsv</code> avec quelques données de test :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> employees: List[Employee] = List(
<span class="fu">Employee</span>(<span class="st">"Bill"</span>, <span class="dv">1</span>, <span class="kw">true</span>),
<span class="fu">Employee</span>(<span class="st">"Peter"</span>, <span class="dv">2</span>, <span class="kw">false</span>),
<span class="fu">Employee</span>(<span class="st">"Milton"</span>, <span class="dv">3</span>, <span class="kw">false</span>)
)</code></pre></div>
<p>Quand on appelle <code>writeCsv</code>, le compilateur calcule la valeur du paramètre de type et cherche un implicite de <code>CsvEncoder</code> du type correspondant :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(employees)
<span class="co">// res4: String =</span>
<span class="co">// Bill,1,yes</span>
<span class="co">// Peter,2,no</span>
<span class="co">// Milton,3,no</span></code></pre></div>
<p>On peut utiliser <code>writeCsv</code> avec nimporte quel type de donnée, du moment que l’on a dans le scope l’implicite de <code>CsvEncoder</code> correspondant :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">case</span> <span class="kw">class</span> <span class="fu">IceCream</span>(name: String, numCherries: Int, inCone: Boolean)
<span class="kw">implicit</span> <span class="kw">val</span> iceCreamEncoder: CsvEncoder[IceCream] =
<span class="kw">new</span> CsvEncoder[IceCream] {
<span class="kw">def</span> <span class="fu">encode</span>(i: IceCream): List[String] =
List(
i.<span class="fu">name</span>,
i.<span class="fu">numCherries</span>.<span class="fu">toString</span>,
<span class="kw">if</span>(i.<span class="fu">inCone</span>) <span class="st">"yes"</span> <span class="kw">else</span> <span class="st">"no"</span>
)
}
<span class="kw">val</span> iceCreams: List[IceCream] = List(
<span class="fu">IceCream</span>(<span class="st">"Sundae"</span>, <span class="dv">1</span>, <span class="kw">false</span>),
<span class="fu">IceCream</span>(<span class="st">"Cornetto"</span>, <span class="dv">0</span>, <span class="kw">true</span>),
<span class="fu">IceCream</span>(<span class="st">"Banana Split"</span>, <span class="dv">0</span>, <span class="kw">false</span>)
)</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(iceCreams)
<span class="co">// res7: String =</span>
<span class="co">// Sundae,1,no</span>
<span class="co">// Cornetto,0,yes</span>
<span class="co">// Banana Split,0,no</span></code></pre></div>
<h3 id="résoudre-les-instances"><span class="header-section-number">3.1.1</span> Résoudre les instances</h3>
<p>Les <em>types classes</em> sont très flexibles mais elles nous imposent de définir une instance pour chaque type qui nous intéresse. Heureusement, le compilateur de Scala a plus d’un tour dans son sac, si on lui donne certaines regles, il est capable de résoudre les instances pour nous.<br />
Par exemple, on peut ecrire une règle qui créé un <code>CsvEncoder</code> pour <code>(A, B)</code> pour un <code>CsvEncoder</code> pour <code>A</code> et un pour <code>B</code> donnés :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> pairEncoder[A, B](
<span class="kw">implicit</span>
aEncoder: CsvEncoder[A],
bEncoder: CsvEncoder[B]
): CsvEncoder[(A, B)] =
<span class="kw">new</span> CsvEncoder[(A, B)] {
<span class="kw">def</span> <span class="fu">encode</span>(pair: (A, B)): List[String] = {
<span class="kw">val</span> (a, b) = pair
aEncoder.<span class="fu">encode</span>(a) ++ bEncoder.<span class="fu">encode</span>(b)
}
}</code></pre></div>
<p>Quand tous les paramètres d’un <code>implicit def</code> sont eux meme marquer <code>implicit</code>, alors le compilateur peut l’utiliser comme une règle de résolution pour crée des instance a partire d’autres instances. Par exemple, si l’on appel <code>writeCsv</code> et qu’on lui passe une <code>List[(Employee, IceCream)]</code>, le compilateur est capable de combiner <code>pairEncoder</code>, <code>employeeEncoder</code> et <code>iceCreamEncoder</code> pour produire le <code>CsvEncoder[(Employee, IceCream)]</code> requis:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(employees zip iceCreams)
<span class="co">// res8: String =</span>
<span class="co">// Bill,1,yes,Sundae,1,no</span>
<span class="co">// Peter,2,no,Cornetto,0,yes</span>
<span class="co">// Milton,3,no,Banana Split,0,no</span></code></pre></div>
<p>À partir d’une liste de règles écrites à partir d’ <code>implicit val</code>s et d’<code>implicit def</code>s, le compilateur est capable de <em>rechercher</em> les combinaisons pour retourner l’instance requise.</p>
<p>Cette fonctionalité, connue sous le nom de <em>résolution d’<code>implicit</code>s</em>, est ce qui rend le pattern des <em>types classes</em> si puissant en Scala.</p>
<p>Même avec cette puissance, le compilateur ne peut démanteler nos <em>case classes</em> et <em>sealed traits</em>. On est tenu de définir à la main les instances de nos <em>ADT</em>s. Les représentations génériques de shapeless changent la donne, car ils nous permettent de déduire automatiquement les instances de nimporte quel <em>ADT</em>.</p>
<h3 id="sec:generic:idiomatic-style"><span class="header-section-number">3.1.2</span> Les définitions de <em>type class</em> idiomatique</h3>
<p>Le style généralement accépter pour la définition d’une type classe idiomatique Il est généralement accépte d’inclure un objet compagon contenant certaines methode standar lors de la définition d’une type classe idiomatique :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">object</span> CsvEncoder {
<span class="co">// "Summoner" method</span>
<span class="kw">def</span> apply[A](<span class="kw">implicit</span> enc: CsvEncoder[A]): CsvEncoder[A] =
enc
<span class="co">// "Constructor" method</span>
<span class="kw">def</span> instance[A](func: A => List[String]): CsvEncoder[A] =
<span class="kw">new</span> CsvEncoder[A] {
<span class="kw">def</span> <span class="fu">encode</span>(value: A): List[String] =
<span class="fu">func</span>(value)
}
<span class="co">// Globally visible type class instances</span>
}</code></pre></div>
<p>La methode <code>apply</code> connue sous le nom de <em>summoner</em> ou <em>materializer</em>, nous permet d’invoquer une instance de <em>type class</em> selon un type donnée:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">CsvEncoder[IceCream]
<span class="co">// res9: CsvEncoder[IceCream] = $anon$1@1ab6e866</span></code></pre></div>
<p>Dans les cas les plus simple le <em>summoner</em> fait la meme chose que la méhode <code>implicitly</code> définie dans <code>scala.Predef</code>:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">implicitly[CsvEncoder[IceCream]]
<span class="co">// res10: CsvEncoder[IceCream] = $anon$1@1ab6e866</span></code></pre></div>
<p>Cependant, comme nous le verrons dans la section 4.2, lors que l’on travaille avec shapeless il arrive que la methode <code>implicitly</code> n’infère pas les types correctement. On peut toujours définir une methode <em>summoner</em> pour avoir le bon comportement, donc cela vaut le coup d’en écrire une pour chaque <em>type class</em> que l’on créé. On peut aussi utiliser une methode de shapeless appelée “<code>the</code>” (nous y reviendrons):</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless._</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">the[CsvEncoder[IceCream]]
<span class="co">// res11: CsvEncoder[IceCream] = $anon$1@1ab6e866</span></code></pre></div>
<p>La methode <code>instance</code> parfois appelé <code>pure</code>, fournis une syntaxe simple pour crée de nouvelle instance de <em>type class</em>e, réduisant au passage le code <em>boilerplate</em> pour les classes anoymes:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">val</span> booleanEncoder: CsvEncoder[Boolean] =
<span class="kw">new</span> CsvEncoder[Boolean] {
<span class="kw">def</span> <span class="fu">encode</span>(b: Boolean): List[String] =
<span class="kw">if</span>(b) List(<span class="st">"yes"</span>) <span class="kw">else</span> List(<span class="st">"no"</span>)
}</code></pre></div>
<p>Est réduit en:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">val</span> booleanEncoder: CsvEncoder[Boolean] =
<span class="fu">instance</span>(b => <span class="kw">if</span>(b) List(<span class="st">"yes"</span>) <span class="kw">else</span> List(<span class="st">"no"</span>))</code></pre></div>
<p>Malheureusement, les limitations imposées par le livre nous empèchent d’écrire un grand singleton contenant beaucoup de méthodes et d’instances. Nous préférons donc décrire les définitons en dehors de leurs <em>object</em> compagnon. Ceci est à garder a l’esprit lorsque que vous lisez ce livre mais rappelez-vous que code complet se trouve dans le dépôt mentionné dans la section 1.2</p>
<h2 id="sec:generic:products"><span class="header-section-number">3.2</span> Déduire des instances pour les produits</h2>
<p>Dans cette section nous utilisons shapeless pour déduire des instances de <em>types classes</em> pour des types de produits. (<em>ie.</em> <em>case classes</em>).</p>
<p>Utilisons les deux idées suivantes :</p>
<ol style="list-style-type: decimal">
<li><p>Si l’on a une instance de type <em>class</em> pour la tête et la queue d’une <code>HList</code>, on peut en déduire l’instance de toute la <code>HList</code>.</p></li>
<li><p>Si nous avons une case class <code>A</code>, un <code>Generic[A]</code> et une instance de <em>type class</em> pour le <code>Repr</code> de ce générique, nous pouvons alors les combiner pour obtenir une instance de <code>A</code>.</p></li>
</ol>
<p>Prenons <code>CsvEncoder</code> et <code>IceCream</code> comme exemples :</p>
<ul>
<li><p><code>IceCream</code> a un <code>Repr</code> générique de type <code>String :: Int :: Boolean :: HNil</code>.</p></li>
<li><p>Le <code>Repr</code> est fait d’une <code>String</code>, d’un <code>Int</code>, d’un <code>Boolean</code> et d’une <code>HNil</code>. Si nous avons un <code>CsvEncoder</code> pour ces types alors nous disposons d’un encodeur pour le tout.</p></li>
<li><p>Si nous pouvons déduire un <code>CsvEncoder</code> pour le <code>Repr</code>, nous pouvons en créer un pour <code>IceCream</code>.</p></li>
</ul>
<h3 id="les-instances-de-hlists"><span class="header-section-number">3.2.1</span> Les instances de <em>HLists</em></h3>
<p>Commençons par définir les constructeurs d’instance de <code>CsvEncoders</code> pour <code>String</code>, <code>Int</code> et <code>Boolean</code>:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">def</span> createEncoder[A](func: A => List[String]): CsvEncoder[A] =
<span class="kw">new</span> CsvEncoder[A] {
<span class="kw">def</span> <span class="fu">encode</span>(value: A): List[String] = <span class="fu">func</span>(value)
}
<span class="kw">implicit</span> <span class="kw">val</span> stringEncoder: CsvEncoder[String] =
<span class="fu">createEncoder</span>(str => List(str))
<span class="kw">implicit</span> <span class="kw">val</span> intEncoder: CsvEncoder[Int] =
<span class="fu">createEncoder</span>(num => List(num.<span class="fu">toString</span>))
<span class="kw">implicit</span> <span class="kw">val</span> booleanEncoder: CsvEncoder[Boolean] =
<span class="fu">createEncoder</span>(bool => List(<span class="kw">if</span>(bool) <span class="st">"yes"</span> <span class="kw">else</span> <span class="st">"no"</span>))</code></pre></div>
<p>Nous pouvons combiner ces blocs de construction pour créer un encodeur pour notre <code>HList</code>. Nous utiliserons deux règles : une pour <code>HNil</code> et une pour <code>::</code> comme illustré ci-dessous :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless.{HList, ::, HNil}
<span class="kw">implicit</span> <span class="kw">val</span> hnilEncoder: CsvEncoder[HNil] =
<span class="fu">createEncoder</span>(hnil => Nil)
<span class="kw">implicit</span> <span class="kw">def</span> hlistEncoder[H, T <: HList](
<span class="kw">implicit</span>
hEncoder: CsvEncoder[H],
tEncoder: CsvEncoder[T]
): CsvEncoder[H :: T] =
createEncoder {
<span class="kw">case</span> h :: t =>
hEncoder.<span class="fu">encode</span>(h) ++ tEncoder.<span class="fu">encode</span>(t)
}</code></pre></div>
<p>Prises toutes ensemble, ces cinq instances nous permettent d’invoquer un <code>CsvEncoders</code> pour toute <code>HList</code> impliquant <code>Strings</code>, <code>Ints</code> et <code>Booleans</code>:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> reprEncoder: CsvEncoder[String :: Int :: Boolean :: HNil] =
implicitly</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">reprEncoder.<span class="fu">encode</span>(<span class="st">"abc"</span> :: <span class="dv">123</span> :: <span class="kw">true</span> :: HNil)
<span class="co">// res9: List[String] = List(abc, 123, yes)</span></code></pre></div>
<h3 id="sec:generic:product-generic"><span class="header-section-number">3.2.2</span> Des instance pour nos produits</h3>
<p>On peut combiner nos règles de déduction de <code>HList</code>s avec nos instances de <code>Generic</code> pour produire un <code>CsvEncoder</code> pour <code>IceCream</code>:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless.<span class="fu">Generic</span>
<span class="kw">implicit</span> <span class="kw">val</span> iceCreamEncoder: CsvEncoder[IceCream] = {
<span class="kw">val</span> gen = Generic[IceCream]
<span class="kw">val</span> enc = CsvEncoder[gen.<span class="fu">Repr</span>]
<span class="fu">createEncoder</span>(iceCream => enc.<span class="fu">encode</span>(gen.<span class="fu">to</span>(iceCream)))
}</code></pre></div>
<p>et l’utiliser comme suit :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(iceCreams)
<span class="co">// res11: String =</span>
<span class="co">// Sundae,1,no</span>
<span class="co">// Cornetto,0,yes</span>
<span class="co">// Banana Split,0,no</span></code></pre></div>
<p>Mais cette solution est spécifique à <code>IceCream</code>. Idéalement on voudrait définir une seule règle pour toutes les <em>case classes</em> qui ont un <code>Generic</code> et le <code>CsvEncoder</code> correspondant. Montrons pas à pas comment faire cette déduction. Voici la première étape :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> genericEncoder[A](
<span class="kw">implicit</span>
gen: Generic[A],
enc: CsvEncoder[???]
): CsvEncoder[A] = <span class="fu">createEncoder</span>(a => enc.<span class="fu">encode</span>(gen.<span class="fu">to</span>(a)))</code></pre></div>
<p>Nous devons choisir le type à placer à la place de <code>???</code>. Mais le problème est que l’on ne peut pas utiliser le type <code>Repr</code> associé avec <code>gen</code>, la solution suivante n’est pas possible :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> genericEncoder[A](
<span class="kw">implicit</span>
gen: Generic[A],
enc: CsvEncoder[gen.<span class="fu">Repr</span>]
): CsvEncoder[A] =
<span class="fu">createEncoder</span>(a => enc.<span class="fu">encode</span>(gen.<span class="fu">to</span>(a)))
<span class="co">// <console>:27: error: illegal dependent method type: parameter may only be referenced in a subsequent parameter section</span>
<span class="co">// gen: Generic[A],</span>
<span class="co">// ^</span></code></pre></div>
<p>Nous avons ici un problème de scope : On ne peut faire référence à un membre de type d’un paramètre à partir d’un autre paramètre du même bloc. L’astuce pour contourner ce problème est d’ajouter un nouveau paramètre de type à notre méthode, et y faire référence dans chacune des valeurs associées :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> genericEncoder[A, R](
<span class="kw">implicit</span>
gen: Generic[A] { <span class="kw">type</span> Repr = R },
enc: CsvEncoder[R]
): CsvEncoder[A] =
<span class="fu">createEncoder</span>(a => enc.<span class="fu">encode</span>(gen.<span class="fu">to</span>(a)))</code></pre></div>
<p>Nous traiterons ce style d’écriture dans le chapitre suivant. Maintenant, cette définiton compile et fonctionne comme attendu avec n’importe quelle case class. Intuitivement, la définition nous dit :</p>
<blockquote>
<p><em>Avec un <code>A</code> donné et une <code>HList</code> de type <code>R</code>, avec un implicite <code>Generic</code> qui relie <code>A</code> a <code>R</code> et un <code>CsvEncoder</code> pour <code>R</code>, alors on crée un <code>CsvEncoder</code> pour <code>A</code>.</em></p>
</blockquote>
<p>Nous avons maintenant un système complet qui peut gérer n’importe quelle case class.</p>
<p>L’appel suivant</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(iceCreams)</code></pre></div>
<p>est résolu par le compilateur comme suit :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(iceCreams)(
<span class="fu">genericEncoder</span>(
Generic[IceCream],
<span class="fu">hlistEncoder</span>(stringEncoder,
<span class="fu">hlistEncoder</span>(intEncoder,
<span class="fu">hlistEncoder</span>(booleanEncoder, hnilEncoder)))))</code></pre></div>
<p>et il peut inférer les valeurs correctes pour un grand nombre de types différents. Tout comme moi, je suis sur que vous appréciez ne pas avoir à écrire ce code à la main !</p>
<div class="callout callout-info">
<p><em>l’alias de type Aux</em></p>
<p>Les types refinements comme <code>Generic[A] { type Repr = L }</code> sont verbeux et difficiles à lire, c’est la raison pour laquelle shapeless fournit un alias de type, <code>Generic.Aux</code>, pour reformuler le membre de type en un paramètre de type :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">package</span> shapeless
<span class="kw">object</span> Generic {
<span class="kw">type</span> Aux[A, R] = Generic[A] { <span class="kw">type</span> Repr = R }
}</code></pre></div>
<p>Avec l’alias de type la définition devient beaucoup plus lisible :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> genericEncoder[A, R](
<span class="kw">implicit</span>
gen: Generic.<span class="fu">Aux</span>[A, R],
env: CsvEncoder[R]
): CsvEncoder[A] =
<span class="fu">createEncoder</span>(a => env.<span class="fu">encode</span>(gen.<span class="fu">to</span>(a)))</code></pre></div>
<p>Notez bien que le type <code>Aux</code> ne change pas la sémantique, cela rend juste les chose plus faciles à lire. Le pattern <code>Aux</code> est souvent utilisé dans le code de shapeless.</p>
</div>
<h3 id="alors-quels-en-sont-les-inconvénients"><span class="header-section-number">3.2.3</span> Alors quels en sont les inconvénients ?</h3>
<p>Si tout ce que l’on vient de voir semble magique, permettez-moi de vous ramener à la réalité. Si quelque-chose tourne mal, le compilateur ne vous sera pas d’une grande aide.</p>
<p>Il existe deux raisons pour laquelle le code précédent pourrait ne pas compiler. La première est si le compilateur ne peut pas trouver l’instance de <code>Generic</code>. Par exemple, si nous essayons d’appeler <code>writeCsv</code> avec une simple classe :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">class</span> <span class="fu">Foo</span>(bar: String, baz: Int)</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(List(<span class="kw">new</span> <span class="fu">Foo</span>(<span class="st">"abc"</span>, <span class="dv">123</span>)))
<span class="co">// <console>:31: error: could not find implicit value for parameter encoder: CsvEncoder[Foo]</span>
<span class="co">// writeCsv(List(new Foo("abc", 123)))</span>
<span class="co">// ^</span></code></pre></div>
<p>Dans ce cas le message est relativement simple à comprendre. Si shapeless ne peut calculer un <code>Generic</code> cela veut dire que le type en question n’est pas un <em>ADT</em> (il y a quelque-part dans l’algèbre un type qui n’est pas une case class ou un trait scellé).</p>
<p>L’autre source potentielle d’erreur survient lorsque le compilateur ne peut calculer un <code>CsvEncoder</code> pour notre <code>HList</code>. Cela arrive normalement car l’on n’a pas d’encodeur pour un des champs de notre <em>ADT</em>. Par exemple nous n’avons pas encore défini de <code>CsvEncoder</code> pour <code>java.util.Date</code>, donc le code suivant ne fonctionne pas :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> java.<span class="fu">util</span>.<span class="fu">Date</span>
<span class="kw">case</span> <span class="kw">class</span> <span class="fu">Booking</span>(room: String, date: Date)</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(List(<span class="fu">Booking</span>(<span class="st">"Lecture hall"</span>, <span class="kw">new</span> Date())))
<span class="co">// <console>:33: error: could not find implicit value for parameter encoder: CsvEncoder[Booking]</span>
<span class="co">// writeCsv(List(Booking("Lecture hall", new Date())))</span>
<span class="co">// ^</span></code></pre></div>
<p>Le messsage d’erreur ne nous aide pas vraiment. Tout ce que le compilateur sait, c’est qu’il a essayé un grand nombre de combinaisons d’implicites et qu’aucune ne fonctionnait. Il n’a aucune idée de quelle combinaison était la plus proche de celle attendue, donc il ne peut nous dire où se trouve la source du problème.</p>
<p>Il n’y a pas de quoi se réjouir ici. Nous devons trouver nous-même la source des erreurs par un processus d’élimination. Nous aborderons les techniques de debuggage dans la section 3.5. Pour l’instant la seule fonctionalité qui compense c’est que la résolution d’implicite plantera toujours à la compilation. Il y a une petite chance que cela finisse par produire du code qui plante durant l’exécution.</p>
<h2 id="sec:generic:coproducts"><span class="header-section-number">3.3</span> Déduire les instances pour les coproduits</h2>
<p>Dans la section précédente nous avons crée un ensemble de règle pour déduire automatiquement un <code>CsvEncoder</code> pour n’importe quel type de produits. Dans cette section allons appliqué les mêmes patrons de conception aux coproduits. Retournons a notre exemple, l’<em>ADT</em> shape :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">sealed</span> <span class="kw">trait</span> Shape
<span class="kw">final</span> <span class="kw">case</span> <span class="kw">class</span> Rectangle(width: Double, height: Double) <span class="kw">extends</span> Shape
<span class="kw">final</span> <span class="kw">case</span> <span class="kw">class</span> <span class="fu">Circle</span>(radius: Double) <span class="kw">extends</span> Shape</code></pre></div>
<p>La représentation générique de <code>Shape</code> est <code>Rectangle :+: Circle :+: CNil</code>. Dans la section 3.2.2 nous avons définie des encodeurs de produit pour <code>Rectangle</code> et <code>Circle</code>. Maintenant, pour écrire des <code>CsvEncoders</code> générique pour <code>:+:</code> et <code>CNil</code>, nous alons utilisé les mêmes principes que pour <code>HList</code>s:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless.{Coproduct, :+:, CNil, Inl, Inr}
<span class="kw">implicit</span> <span class="kw">val</span> cnilEncoder: CsvEncoder[CNil] =
<span class="fu">createEncoder</span>(cnil => <span class="kw">throw</span> <span class="kw">new</span> Exception(<span class="st">"Inconceivable!"</span>))
<span class="kw">implicit</span> <span class="kw">def</span> coproductEncoder[H, T <: Coproduct](
<span class="kw">implicit</span>
hEncoder: CsvEncoder[H],
tEncoder: CsvEncoder[T]
): CsvEncoder[H :+: T] = createEncoder {
<span class="kw">case</span> <span class="fu">Inl</span>(h) => hEncoder.<span class="fu">encode</span>(h)
<span class="kw">case</span> <span class="fu">Inr</span>(t) => tEncoder.<span class="fu">encode</span>(t)
}</code></pre></div>
<p>Il importe de noter deux choses :</p>
<ol style="list-style-type: decimal">
<li><p>Comme <code>Coproduct</code>s est une <em>disjonction</em> de types, l’encoder de <code>:+:</code> doit <em>choisir</em> si il a à encoder la valeur de droit ou de gauche. On fait un pattern matching sur les deux sous types de <code>:+:</code>, qui sont <code>Inl</code> pour la gauche et <code>Inr</code> pour la droite.</p></li>
<li><p>Etonnament, l’encoder de <code>CNil</code> lève une exception! Mais pas de panique. Rappelez vous que l’on ne peut crée de valeur pour le type <code>CNil</code>, donc the <code>throw</code> et en fait du code mort.</p></li>
</ol>
<p>Si l’on utilise ces définitions avec celle de nos produit de la section 3.2, on sera capable de sérializer une liste de shapes. Essayons:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> shapes: List[Shape] = List(
Rectangle(<span class="fl">3.0</span>, <span class="fl">4.0</span>),
<span class="fu">Circle</span>(<span class="fl">1.0</span>)
)</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(shapes)
<span class="co">// <console>:33: error: could not find implicit value for parameter encoder: CsvEncoder[Shape]</span>
<span class="co">// writeCsv(shapes)</span>
<span class="co">// ^</span></code></pre></div>
<p>Oh non, ca n’a pas fonctionné ! Le message d’erreur ne nous aide pas comme prévu. Nous avons cette erreur car nous n’avons pas d’instance de <code>CsvEncoder</code> pour <code>Double</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">val</span> doubleEncoder: CsvEncoder[Double] =
<span class="fu">createEncoder</span>(d => List(d.<span class="fu">toString</span>))</code></pre></div>
<p>Avec cette nouvelle définition, tout fonctionne comme prévus:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">writeCsv</span>(shapes)
<span class="co">// res7: String =</span>
<span class="co">// 3.0,4.0</span>
<span class="co">// 1.0</span></code></pre></div>
<div class="callout callout-warning">
<p><em>SI-7046 et vous</em> Il y a dans Scala un bug du compilateur appelé <a href="https://issues.scala-lang.org/browse/SI-7046">SI-7046</a> qui peut amener la résolution de générique pour comproduct a ne pas fonctionner. Le bug provoque dans certaines partie de l’API de macro, dont shapeless dépend, deviens sensible a l’ordre des définitions dans le code source. C’est un problème qui peut souvant etre contourner en réordonant le code et en renoment les fichiers, mais ces solution on tendence a ne durée qu’un temps et sont peut fiable.</p>
<p>Si vous utilisez <em>Lightbend Scala 2.11.8</em> ou une version plus ancienne et que vous ètes toucher par ce problème, pensez a mettre a jour vers la version <em>Lightbend Scala 2.11.9</em> ou <em>Typelevel Scala 2.11.8</em>. SI-7046 est corrigée dans chacune de de ces versions.</p>
</div>
<h3 id="aligner-les-colonnes-dans-la-sortie-csv"><span class="header-section-number">3.3.1</span> Aligner les colonnes dans la sortie CSV</h3>
<p>Notre encodeur de CSV n’est idéal dans ca forme courante. Il permet au champs de <code>Rectangle</code> et <code>Circle</code> de se retrouver dans la meme colonne. Pour remédier a a ce problème il faut changer la définition de <code>CsvEncoder</code> pour ajouter la largeur des type de données et ainsi espacer les colonnes en conséquence. Le dépôt d’exemple contenant l’implémentation complète d’un <code>CsvEncoder</code> traitant ce problème est linké dans la section 1.2</p>
<h2 id="la-déduction-dinstance-pour-les-type-récursif."><span class="header-section-number">3.4</span> La déduction d’instance pour les type récursif.</h2>
<p>Essayons quelque chose de plus ambitieu : un arbre binaire :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">sealed</span> <span class="kw">trait</span> Tree[A]
<span class="kw">case</span> <span class="kw">class</span> Branch[A](left: Tree[A], right: Tree[A]) <span class="kw">extends</span> Tree[A]
<span class="kw">case</span> <span class="kw">class</span> Leaf[A](value: A) <span class="kw">extends</span> Tree[A]</code></pre></div>
<p>En théorie nous devrions deja avoir toutes les définiton pour instancier un CSV writer pour notre arbre. Pourtant, appler <code>writeCsv</code> provoque une erreur : However, calls to <code>writeCsv</code> fail to compile:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">CsvEncoder[Tree[Int]]
<span class="co">// <console>:25: error: could not find implicit value for parameter enc: CsvEncoder[Tree[Int]]</span>
<span class="co">// CsvEncoder[Tree[Int]]</span>
<span class="co">// ^</span></code></pre></div>
<p>Le problème est que notre type est qu’il est récusif. Le compilateur rentre dans une boucle infie en essayant d’appliquer nos implicits puis il abandonne.</p>
<h3 id="les-divergences-dimplicits"><span class="header-section-number">3.4.1</span> Les divergences d’implicits</h3>
<p>La résolution d’<code>implicit</code> est un processus de recherche. Le compilateur utilise des heuristiques pour s’orienter vers la bonne solution. Le compilateur effectue ses recherches branche par branche, si l’une d’elle ne donne pas de résultat favorable, le compilateur considère que cette branche n’aboutira pas et continue ses recherches sur une autre branche.</p>
<p>Une des heuristique est conçue spécifiquement pour éviter les boucles infinies. Si le compilateur rencontre le type cible deux fois dans une branche de recherche; il abandonne cette branche et passe a une autre. On peut l’observer si on regarde l’expression <code>CsvEncoder[Tree[Int]]</code>. Le processus de résolution d’implicits suit les étapes suivantes :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">CsvEncoder[Tree[Int]] <span class="co">// 1</span>
CsvEncoder[Branch[Int] :+: Leaf[Int] :+: CNil] <span class="co">// 2</span>
CsvEncoder[Branch[Int]] <span class="co">// 3</span>
CsvEncoder[Tree[Int] :: Tree[Int] :: HNil] <span class="co">// 4</span>
CsvEncoder[Tree[Int]] <span class="co">// 5 uh oh</span></code></pre></div>
<p>On rencontre <code>Tree[A]</code> deux fois lignes 1 et 5, donc le compilateur abandonne la recherche dans cette branche. La conséquence est que le compilateur echoue à trouver le bon <em>implicit</em>.</p>
<p>En fait, la situation est pire. Si le compilateur voit le même constructeur de types deux fois et que la complexité du paramètre de type <em>augmente</em> il suppose que la branche n’aboutira pas.* C’est un problème avec shapeless car les types comme <code>::[H, T]</code> et <code>:+:[H, T]</code> peuvent apparaître plusieurs fois lorsque le compilateur développe les représentations génériques. Ce qui pousse le compilateur a abandonner prématurément même si il aurait pu trouver la solution si il avait persisté à chercher dans cette voie.</p>
<p>Compte-tenu des types suivants :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">case</span> <span class="kw">class</span> <span class="fu">Bar</span>(baz: Int, qux: String)
<span class="kw">case</span> <span class="kw">class</span> <span class="fu">Foo</span>(bar: Bar)</code></pre></div>
<p>Le déroulement de la recherche pour <code>Foo</code> ressemble à ça :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">CsvEncoder[Foo] <span class="co">// 1</span>
CsvEncoder[Bar :: HNil] <span class="co">// 2</span>
CsvEncoder[Bar] <span class="co">// 3</span>
CsvEncoder[Int :: String :: HNil] <span class="co">// 4 uh oh</span></code></pre></div>
<p>Le compilateur essait de résoudre <code>CsvEncoder[::[H, T]]</code> deux fois dans cette branche, une fois a la ligne 2 et une fois a la ligne 4. Le paramètre de type <code>T</code> est plus complexe à la ligne 4 qu’à la ligne 2, donc le compilateur pense (de façon erronée dans ce cas) que la recherche dans cette branche n’aboutira pas. Il change de branche encore et encore, il ne trouvera pas de quoi générer la bonne instance.</p>
<h3 id="lazy"><span class="header-section-number">3.4.2</span> <em>Lazy</em></h3>
<p>La divergence d’<code>implicit</code> peut marquer un arrêt pour la librairie shapeless. Heureusement, shapeless fournit un type appeler <code>Lazy</code> pour contourner ce problème. <code>Lazy</code> fait deux choses :</p>
<ol style="list-style-type: decimal">
<li><p>Il supprime la divergence d’<code>implicit</code> à la compilation en se protégeant des heuristiques trop défensives.</p></li>
<li><p>Il reporte l’évaluation des paramètres implicites au runtime, ce qui permet la déduction des implicits récursifs.</p></li>
</ol>
<p>On utilise <code>Lazy</code> en le paramétrant avec nos paramètres implicites. En règle générale, il est toujours bon d’englober dans <code>Lazy</code> le paramètre de “tête” de toute règle de <code>HList</code> ou de <code>Coproduct</code> ainsi que n’importe quel paramètre <code>Repr</code> d’un <code>Generic</code>:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> hlistEncoder[H, T <: HList](
<span class="kw">implicit</span>
hEncoder: Lazy[CsvEncoder[H]], <span class="co">// wrap in Lazy</span>
tEncoder: CsvEncoder[T]
): CsvEncoder[H :: T] = createEncoder {
<span class="kw">case</span> h :: t =>
hEncoder.<span class="fu">value</span>.<span class="fu">encode</span>(h) ++ tEncoder.<span class="fu">encode</span>(t)
}</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> coproductEncoder[H, T <: Coproduct](
<span class="kw">implicit</span>
hEncoder: Lazy[CsvEncoder[H]], <span class="co">// wrap in Lazy</span>
tEncoder: CsvEncoder[T]
): CsvEncoder[H :+: T] = createEncoder {
<span class="kw">case</span> <span class="fu">Inl</span>(h) => hEncoder.<span class="fu">value</span>.<span class="fu">encode</span>(h)
<span class="kw">case</span> <span class="fu">Inr</span>(t) => tEncoder.<span class="fu">encode</span>(t)
}</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> genericEncoder[A, R](
<span class="kw">implicit</span>
gen: Generic.<span class="fu">Aux</span>[A, R],
rEncoder: Lazy[CsvEncoder[R]] <span class="co">// wrap in Lazy</span>
): CsvEncoder[A] = createEncoder { value =>
rEncoder.<span class="fu">value</span>.<span class="fu">encode</span>(gen.<span class="fu">to</span>(value))
}</code></pre></div>
<p>Ceci permet au compilateur de ne pas jeter l’éponge prématurément et donc permet aux types complex/récursif comme <code>Tree</code> de fonctionner :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">CsvEncoder[Tree[Int]]
<span class="co">// res2: CsvEncoder[Tree[Int]] = $anon$1@624d14b2</span></code></pre></div>
<h2 id="sec:generic:debugging"><span class="header-section-number">3.5</span> Débugger les résolutions d’implicites</h2>
<p>Les erreurs dans la résolution d’implicites peuvent être déconcertantes et frustrantes. Voici quelques techniques à utiliser quand les choses vont mal.</p>
<h3 id="débugger-en-utilisant-implicitly"><span class="header-section-number">3.5.1</span> Débugger en utilisant <em>implicitly</em></h3>
<p>Que peut-on faire quand les compilateurs ne trouvent simplement pas la valeur implicite ? L’erreur peut être causée par la résolution de n’importe quel implicit. Par exemple :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">case</span> <span class="kw">class</span> <span class="fu">Foo</span>(bar: Int, baz: Float)</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">CsvEncoder[Foo]
<span class="co">// <console>:31: error: could not find implicit value for parameter enc: CsvEncoder[Foo]</span>
<span class="co">// CsvEncoder[Foo]</span>
<span class="co">// ^</span></code></pre></div>
<p>Nous avons une erreur car nous navons pas défini <code>CsvEncoder</code> pour <code>Float</code>. Pourtant, cela n’est peut-être pas évident à voir dans le code de l’application. On peut chercher l’erreur en imaginant comment l’implicite est censé se développer, insérer des appels à <code>CsvEncoder.apply</code> ou à <code>implicitly</code> au-dessus de l’erreur pour voir si cela compile. Commençons avec la représentation générique de <code>Foo</code>:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">CsvEncoder[Int :: Float :: HNil]
<span class="co">// <console>:29: error: could not find implicit value for parameter enc: CsvEncoder[shapeless.::[Int,shapeless.::[Float,shapeless.HNil]]]</span>
<span class="co">// CsvEncoder[Int :: Float :: HNil]</span>
<span class="co">// ^</span></code></pre></div>
<p>L’erreur ici nous en dit un peu plus, on doit continuer à chercher plus profondément dans la chaînes d’appel des implicites. L’étape suivante est de tester les composants de <code>HList</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">CsvEncoder[Int]</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">CsvEncoder[Float]
<span class="co">// <console>:29: error: could not find implicit value for parameter enc: CsvEncoder[Float]</span>
<span class="co">// CsvEncoder[Float]</span>
<span class="co">// ^</span></code></pre></div>
<p><code>Int</code> fonctionne mais <code>Float</code> lève une erreur. <code>CsvEncoder[Float]</code> est une feuille dans le développement de notre abre, on sait donc que l’on doit commencer par implémenter l’instance manquante. Si ajouter l’instance ne corrige pas le problème, on répète le processus pour trouver le prochain point problématique.</p>
<h3 id="debugger-en-utilisant-reify"><span class="header-section-number">3.5.2</span> Debugger en utilisant <em>reify</em></h3>
<p>La méthode <code>reify</code> de <code>scala.reflect</code> prend une expression Scala en paramètre et retourne un objet AST représentant l’expression sous forme d’abre avec toutes les annotations de types.</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> scala.<span class="fu">reflect</span>.<span class="fu">runtime</span>.<span class="fu">universe</span>._</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">println</span>(<span class="fu">reify</span>(CsvEncoder[Int]))
<span class="co">// Expr[CsvEncoder[Int]]($read.$iw.$iw.$iw.$iw.CsvEncoder.apply[Int]($read.$iw.$iw.$iw.$iw.intEncoder))</span></code></pre></div>
<p>Les types inferés pendant la résolution d’implicite peuvent nous donner un indice sur le problème. Après la résolution d’implicite, tous les types existentiels restants comme <code>A</code> ou <code>T</code> indiquent que quelque-chose n’a pas bien fonctionné. Les types “top” et “bottom” comme <code>Any</code> and <code>Nothing</code> sont aussi la preuve d’une erreur.</p>
<h2 id="en-résumé"><span class="header-section-number">3.6</span> En résumé</h2>
<p>Dans ce chapitre nous avons expliqué comment utiliser <code>Generic</code>, <code>HList</code>s, et <code>Coproduct</code>s pour déduire automatiquement l’instance d’une <em>type class</em>. Nous avons couvert aussi le type <code>Lazy</code> qui est un moyen de manipuler les types complexes/recursifs. Compte tenu de tout ceci, on peut écrire le squelette commun suivant qui permet de déduire des instances de <em>type class</em>.</p>
<p>Premièrement, définissons la <em>type class</em> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">trait</span> MyTC[A]</code></pre></div>
<p>Définissons les instances pour les types primitifs :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> intInstance: MyTC[Int] = ???
<span class="kw">implicit</span> <span class="kw">def</span> stringInstance: MyTC[String] = ???
<span class="kw">implicit</span> <span class="kw">def</span> booleanInstance: MyTC[Boolean] = ???</code></pre></div>
<p>Définissons les instances pour <code>HList</code>:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless._
<span class="kw">implicit</span> <span class="kw">def</span> hnilInstance: MyTC[HNil] = ???
<span class="kw">implicit</span> <span class="kw">def</span> hlistInstance[H, T <: HList](
<span class="kw">implicit</span>
hInstance: Lazy[MyTC[H]], <span class="co">// wrap in Lazy</span>
tInstance: MyTC[T]
): MyTC[H :: T] = ???</code></pre></div>
<p>Si nécessaire, définissons les instances de <code>Coproduct</code>:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> cnilInstance: MyTC[CNil] = ???
<span class="kw">implicit</span> <span class="kw">def</span> coproductInstance[H, T <: Coproduct](
<span class="kw">implicit</span>
hInstance: Lazy[MyTC[H]], <span class="co">// wrap in Lazy</span>
tInstance: MyTC[T]
): MyTC[H :+: T] = ???</code></pre></div>
<p>Enfin, définissons les instances pour <code>Generic</code>:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> genericInstance[A, R](
<span class="kw">implicit</span>
generic: Generic.<span class="fu">Aux</span>[A, R],
rInstance: Lazy[MyTC[R]] <span class="co">// wrap in Lazy</span>
): MyTC[A] = ???</code></pre></div>
<p>Dans le chapitre suivant nous verrons la théorie et des patrons de conception utiles pour écrire ce genre de code. Dans le Chapitre 5, nous reviendrons sur la déduction de <em>type class</em> en utilisant une variante de <code>Generic</code> qui permet d’inspecter les champs et les noms des types dans nos <em>ADT</em>s.</p>
<h1 id="sec:type-level-programming"><span class="header-section-number">4</span> Travailler avec les types et les implicites</h1>
<p>Dans le chapitre précédent, nous avons vu l’un des cas d’utilisation les plus fascinants de shapeless : la déduction automatique d’instance de case class. Nous allons découvrir qu’il existe plusieurs autres exemples au moins aussi saisissants. Cependant, avant d’en arriver là, nous devons prendre un peu de temps pour traiter la théorie que nous avons évité jusqu’ici et établir un ensemble de patrons de conception pour écrire et débugger du code hautement implicite et hautement typé.</p>
<h2 id="types-dépendants"><span class="header-section-number">4.1</span> Types dépendants</h2>
<p>Dans le dernier chapitre, nous avons passé beaucoup de temps à utiliser <code>Generic</code>, la <em>type class</em> qui sert à lier un type <em>ADT</em> à sa représentation générique. Pourtant, nous n’avons pas encore abordé la théorie sous-jacente à <code>Generic</code> et à tout shapeless : <em>les types dépendants</em>.</p>
<p>Pour illustrer tout ca, intéressons-nous de plus près à <code>Generic</code>. Voici une version simplifié de sa définition :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">trait</span> Generic[A] {
<span class="kw">type</span> Repr
<span class="kw">def</span> <span class="fu">to</span>(value: A): Repr
<span class="kw">def</span> <span class="fu">from</span>(value: Repr): A
}</code></pre></div>
<p>Les instances de <code>Generic</code> font référence à deux autres types : un paramètre de type <code>A</code> et un membre de type <code>Repr</code>. Imaginons que l’on implémente une méthode <code>getRepr</code> de la façon suivante. Quel type allons-nous obtenir en retour ?</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless.<span class="fu">Generic</span>
<span class="kw">def</span> getRepr[A](value: A)(<span class="kw">implicit</span> gen: Generic[A]) =
gen.<span class="fu">to</span>(value)</code></pre></div>
<p>La réponse est : tout dépend de l’instance de <code>gen</code> que nous avons. En développant l’appel de <code>getRepr</code>, le compilateur va chercher un <code>Generic[A]</code> et le type sera le <code>Repr</code> défini dans l’instance :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">case</span> <span class="kw">class</span> <span class="fu">Vec</span>(x: Int, y: Int)
<span class="kw">case</span> <span class="kw">class</span> <span class="fu">Rect</span>(origin: Vec, size: Vec)</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">getRepr</span>(<span class="fu">Vec</span>(<span class="dv">1</span>, <span class="dv">2</span>))
<span class="co">// res1: shapeless.::[Int,shapeless.::[Int,shapeless.HNil]] = 1 :: 2 :: HNil</span>
<span class="fu">getRepr</span>(<span class="fu">Rect</span>(<span class="fu">Vec</span>(<span class="dv">0</span>, <span class="dv">0</span>), <span class="fu">Vec</span>(<span class="dv">5</span>, <span class="dv">5</span>)))
<span class="co">// res2: shapeless.::[Vec,shapeless.::[Vec,shapeless.HNil]] = Vec(0,0) :: Vec(5,5) :: HNil</span></code></pre></div>
<p>Ce que nous voyons ici est appelé <em>typage dependent</em>: le type du résultat de <code>getRepr</code> dépend de la valeur de son paramètre de type via son membre de type. Imaginons que nous avons spécifié <code>Repr</code> comme paramètre de type de <code>Generic</code> à la place du membre de type:</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">trait</span> Generic2[A, Repr]
<span class="kw">def</span> getRepr2[A, R](value: A)(<span class="kw">implicit</span> generic: Generic2[A, R]): R =
???</code></pre></div>
<p>Nous aurions dû passer la valeur désirée de <code>Repr</code> dans le paramètre de type de <code>getRepr</code>, ce qui finit par rendre <code>getRepr</code> inutile. On peut en déduire que les paramètres de type sont utiles en tant « qu’inputs » et les membre de type sont utiles en tant « qu’outputs. »</p>
<h2 id="sec:type-level-programming:depfun"><span class="header-section-number">4.2</span> Fonctions à type dépendant</h2>
<p>Shapeless utilise les types dépendants partout : dans <code>Generic</code>, dans <code>Witness</code> (que nous traiterons dans le chapitre suivant), et dans de nombreux type classes « ops » que nous traiterons dans la <em>Partie II</em> de ce guide. Par exemple, shapeless fournit une case class appelée <code>Last</code> qui retourne le dernier élément d’une <code>HList</code>. Voici une version simplifiée de son implémentation :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">package</span> shapeless.<span class="fu">ops</span>.<span class="fu">hlist</span>
<span class="kw">trait</span> Last[L <: HList] {
<span class="kw">type</span> Out
<span class="kw">def</span> <span class="fu">apply</span>(in: L): Out
}</code></pre></div>
<p>On peut invoquer des instances de <code>Last</code> pour inspecter les <code>HList</code>s dans notre code. Notez que dans les deux exemples ci-dessous les types de <code>Out</code> sont dépendants des types des <code>HList</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless.{HList, ::, HNil}
<span class="kw">import</span> shapeless.<span class="fu">ops</span>.<span class="fu">hlist</span>.<span class="fu">Last</span></code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> last1 = Last[String :: Int :: HNil]
<span class="co">// last1: shapeless.ops.hlist.Last[shapeless.::[String,shapeless.::[Int,shapeless.HNil]]]{type Out = Int} = shapeless.ops.hlist$Last$$anon$34@697ed93b</span>
<span class="kw">val</span> last2 = Last[Int :: String :: HNil]
<span class="co">// last2: shapeless.ops.hlist.Last[shapeless.::[Int,shapeless.::[String,shapeless.HNil]]]{type Out = String} = shapeless.ops.hlist$Last$$anon$34@6266c63f</span></code></pre></div>
<p>Une fois les instances de <code>Last</code> invoquées, et on peut les utiliser au value level via leurs méthodes <code>apply</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">last1</span>(<span class="st">"foo"</span> :: <span class="dv">123</span> :: HNil)
<span class="co">// res1: last1.Out = 123</span>
<span class="fu">last2</span>(<span class="dv">321</span> :: <span class="st">"bar"</span> :: HNil)
<span class="co">// res2: last2.Out = bar</span></code></pre></div>
<p>Nous avons deux formes de protection contre les erreurs. L’implicite définie pour <code>Last</code> nous garantit que l’on peut construire une instance de <code>Last</code> uniquement si la <code>HList</code> en entrée est dotée d’au moins un élément :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">Last[HNil]
<span class="co">// <console>:15: error: Implicit not found: shapeless.Ops.Last[shapeless.HNil]. shapeless.HNil is empty, so there is no last element.</span>
<span class="co">// Last[HNil]</span>
<span class="co">// ^</span></code></pre></div>
<p>De plus, le paramètre de type de l’instance de <code>Last</code> vérifie qu’on lui passe bien une instance de <code>HList</code> du bon type :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">last1</span>(<span class="dv">321</span> :: <span class="st">"bar"</span> :: HNil)
<span class="co">// <console>:16: error: type mismatch;</span>
<span class="co">// found : shapeless.::[Int,shapeless.::[String,shapeless.HNil]]</span>
<span class="co">// required: shapeless.::[String,shapeless.::[Int,shapeless.HNil]]</span>
<span class="co">// last1(321 :: "bar" :: HNil)</span>
<span class="co">// ^</span></code></pre></div>
<p>Pour faire un autre exemple, implémentons notre propre type classe, appelé <code>Second</code>, qui retourne le second élément d’une <code>HList</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">trait</span> Second[L <: HList] {
<span class="kw">type</span> Out
<span class="kw">def</span> <span class="fu">apply</span>(value: L): Out
}
<span class="kw">object</span> Second {
<span class="kw">type</span> Aux[L <: HList, O] = Second[L] { <span class="kw">type</span> Out = O }
<span class="kw">def</span> apply[L <: HList](<span class="kw">implicit</span> inst: Second[L]): Aux[L, inst.<span class="fu">Out</span>] =
inst
}</code></pre></div>
<p>Ce code utilise l’agencement idiomatique décrit dans la section 3.1.2. On définit un type <code>Aux</code> dans l’objet compagnon aux cotés de la méthode standard <code>apply</code>, qui permet d’invoquer des instances.</p>
<div class="callout callout-warning">
<p><em>Méthode d’invocation versus “implicitly” versus “the”</em></p>
<p>Remarquez que le type de retour d’<code>apply</code> est <code>Aux[L, O]</code> et non pas <code>Second[L]</code>. C’est important. Utiliser <code>Aux</code> assure que la methode <code>apply</code> n’écrase pas les membres de type de l’instance invoquée. Si l’on définit <code>Second[L]</code> comme type de retour, le membre de type <code>Out</code> sera perdu dans le type retourné et la <em>type class</em> ne fonctionnera plus correctement.</p>
<p>La méthode <code>implicitly</code> de <code>scala.Predef</code> est dotée de cette propriété. Comparons le type d’une instance de <code>Last</code> invoqué par <code>implicitly</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">implicitly[Last[String :: Int :: HNil]]
<span class="co">// res6: shapeless.ops.hlist.Last[shapeless.::[String,shapeless.::[Int,shapeless.HNil]]] = shapeless.ops.hlist$Last$$anon$34@4ce01309</span></code></pre></div>
<p>au type retourné par <code>Last.apply</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">Last[String :: Int :: HNil]
<span class="co">// res7: shapeless.ops.hlist.Last[shapeless.::[String,shapeless.::[Int,shapeless.HNil]]]{type Out = Int} = shapeless.ops.hlist$Last$$anon$34@b46b74a</span></code></pre></div>
<p>Le type invoqué par <code>implicitly</code> n’a pas de membre de type <code>Out</code>. C’est pourquoi on doit éviter d’utiliser <code>implicitly</code> lorsque l’on travaille avec des fonctions à type dépendant. On peut utiliser une méthode d’invocation custom ou directement la méthode <code>the</code> de shapeless :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">import</span> shapeless._
the[Last[String :: Int :: HNil]]
<span class="co">// res8: shapeless.ops.hlist.Last[shapeless.::[String,shapeless.::[Int,shapeless.HNil]]]{type Out = Int} = shapeless.ops.hlist$Last$$anon$34@357a953d</span></code></pre></div>
</div>
<p>Nous n’avons besoin que d’une seule instance définie pour une <code>HList</code>s d’au moins deux éléments :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">implicit</span> <span class="kw">def</span> hlistSecond[A, B, Rest <: HList]: Aux[A :: B :: Rest, B] =
<span class="kw">new</span> Second[A :: B :: Rest] {
<span class="kw">type</span> Out = B
<span class="kw">def</span> <span class="fu">apply</span>(value: A :: B :: Rest): B =
value.<span class="fu">tail</span>.<span class="fu">head</span>
}</code></pre></div>
<p>On peut invoquer les instances en utilisant <code>Second.apply</code> :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">val</span> second1 = Second[String :: Boolean :: Int :: HNil]
<span class="co">// second1: Second[shapeless.::[String,shapeless.::[Boolean,shapeless.::[Int,shapeless.HNil]]]]{type Out = Boolean} = $anon$1@13acefad</span>
<span class="kw">val</span> second2 = Second[String :: Int :: Boolean :: HNil]
<span class="co">// second2: Second[shapeless.::[String,shapeless.::[Int,shapeless.::[Boolean,shapeless.HNil]]]]{type Out = Int} = $anon$1@780348f1</span></code></pre></div>
<p>L’invocation est sujette aux mêmes contraintes que <code>Last</code>. Si l’on essaie d’invoquer une instance pour une <code>HList</code> incompatible, alors la résolution échoue et l’on obtient une erreur de compilation :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala">Second[String :: HNil]
<span class="co">// <console>:27: error: could not find implicit value for parameter inst: Second[shapeless.::[String,shapeless.HNil]]</span>
<span class="co">// Second[String :: HNil]</span>
<span class="co">// ^</span></code></pre></div>
<p>Les instances invoquées avec la méthode <code>apply</code> fonctionne avec les types de <code>HList</code> appropriés au niveau des valeurs (value level)</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">second1</span>(<span class="st">"foo"</span> :: <span class="kw">true</span> :: <span class="dv">123</span> :: HNil)
<span class="co">// res10: second1.Out = true</span>
<span class="fu">second2</span>(<span class="st">"bar"</span> :: <span class="dv">321</span> :: <span class="kw">false</span> :: HNil)
<span class="co">// res11: second2.Out = 321</span></code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">second1</span>(<span class="st">"baz"</span> :: HNil)
<span class="co">// <console>:28: error: type mismatch;</span>
<span class="co">// found : shapeless.::[String,shapeless.HNil]</span>
<span class="co">// required: shapeless.::[String,shapeless.::[Boolean,shapeless.::[Int,shapeless.HNil]]]</span>
<span class="co">// second1("baz" :: HNil)</span>
<span class="co">// ^</span></code></pre></div>
<h2 id="sec:type-level-programming:chaining"><span class="header-section-number">4.3</span> Enchaîner les fonctions dépendantes</h2>
<p>Les fonctions à type dépendant offrent un moyen de calculer un type à partir d’un autre. On peut enchaîner les fonctions à type dépendant pour effectuer un calcul nécessitant plusieurs étapes. Par exemple, on pourrait utiliser <code>Generic</code> pour calculer le <code>Repr</code> d’une case classe et utiliser <code>Last</code> pour calculer le type du dernier élément. Essayons de coder ceci :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">def</span> lastField[A](input: A)(
<span class="kw">implicit</span>
gen: Generic[A],
last: Last[gen.<span class="fu">Repr</span>]
): last.<span class="fu">Out</span> = last.<span class="fu">apply</span>(gen.<span class="fu">to</span>(input))
<span class="co">// <console>:29: error: illegal dependent method type: parameter may only be referenced in a subsequent parameter section</span>
<span class="co">// gen: Generic[A],</span>
<span class="co">// ^</span></code></pre></div>
<p>Malheureusement, notre code ne compile pas. Il s’agit du même problème que nous avions rencontré dans la section 3.2.2 avec notre définition de <code>genericEncoder</code>. Nous avions contourné le problème en remontant la variable de type non-parametré dans la liste des paramètres de types :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">def</span> lastField[A, Repr <: HList](input: A)(
<span class="kw">implicit</span>
gen: Generic.<span class="fu">Aux</span>[A, Repr],
last: Last[Repr]
): last.<span class="fu">Out</span> = last.<span class="fu">apply</span>(gen.<span class="fu">to</span>(input))</code></pre></div>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="fu">lastField</span>(<span class="fu">Rect</span>(<span class="fu">Vec</span>(<span class="dv">1</span>, <span class="dv">2</span>), <span class="fu">Vec</span>(<span class="dv">3</span>, <span class="dv">4</span>)))
<span class="co">// res13: Vec = Vec(3,4)</span></code></pre></div>
<p>En règle général, on écrit toujours du code dans ce style. En paramétrant toutes les variables de type, on permet au compilateur de les unifier avec les types appropriés. Cela vaut également pour des contraintes plus subtiles. Par exemple, imaginons qu’on veuille invoquer un <code>Generic</code> pour une case class qui porte exactement un champ. On pourrait être tenté d’écrire le code suivant :</p>
<div class="sourceCode"><pre class="sourceCode scala"><code class="sourceCode scala"><span class="kw">def</span> getWrappedValue[A, H](input: A)(
<span class="kw">implicit</span>