Initial webpack-define-loader project

Changes to be committed:
	new file:   .gitignore
	new file:   LICENSE
	new file:   README.md
	new file:   index.js
	new file:   package.json
	new file:   parse.js
	new file:   yarn.lock

.gitignore

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+.idea
+.DS_Store
+.vscode
+node_modules

LICENSE

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+MIT License
+
+Copyright (c) 2017 wangkehan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Webpack-Define-Loader
+
+this loader can provide your code(js/ts/...) the ability of c style conditional compilation
+
+## Installation
+
+this loader requires __node version >= 4__
+
+* npm
+```
+npm install webpack-define-loader --save-dev
+```
+* or use yarn
+```
+yarn add webpack-define-loader --dev
+```
+
+
+## Example:
+```js
+//webpack2 config
+{
+    //...
+    module: {
+        rules: [
+            test: /\.(js|jsx|vue)$/,
+            loader: 'webpack-define-loader',
+            options: {
+                DEBUG: true,
+                PLATFORM: 'pc'
+            },
+            enforce: 'pre',
+            exclude: /node_modules/
+        ]
+    }
+    //...
+}
+
+```
+
+```js
+/*
+ * code file
+ * conditional compilation begin with `///`
+ * condition after #if and #elif directive can be any legal js expression
+ */
+
+/// #if DEBUG
+import parse from './parse.debug'
+/// #else
+import parse from './parse.release'
+/// #endif
+
+/// #if PLATFORM==='pc'
+import render from './render.pc'
+/// #elif PLATFORM==='mb'
+import render from './render.mb'
+/// #else
+import render from './render.common'
+/// #endif
+```
+
+## License
+
+MIT
+

index.js

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+"use strict";
+
+const loaderUtils = require('loader-utils');
+const parse = require("./parse");
+module.exports = function (source, map) {
+    this.cacheable && this.cacheable();
+    const data = loaderUtils.getOptions(this);
+
+    try {
+        source = parse(source, data);
+        this.callback(null, source, map);
+    }
+    catch (err) {
+        var errorMessage = "parse error: " + err;
+        this.callback(new Error(errorMessage));
+    }
+};

package.json

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+{
+  "name": "webpack-define-loader",
+  "version": "1.0.4",
+  "engines": {
+    "node": ">=4"
+  },
+  "description": "A c style conditional compilation webpack loader.",
+  "keywords": [
+    "loader",
+    "webpack",
+    "define",
+    "ifdef"
+  ],
+  "main": "index.js",
+  "files": [
+    "index.js",
+    "parse.js"
+  ],
+  "author": "wang",
+  "homepage": "https://github.com/kserver/define-loader",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/kserver/define-loader/issues"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/kserver/define-loader.git"
+  },
+  "dependencies": {
+    "loader-utils": "^1.1.0"
+  }
+}

parse.js

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+"use strict";
+
+function parse(source,defs){
+    if(!defs) defs = {};
+
+    const lines = source.split('\n');
+    const listVarName = '__$list$__';
+    let code = `(function(){
+const ${listVarName} = [];\n`;
+    for(let key of Object.keys(defs)){
+        code += `const ${key} = ${JSON.stringify(defs[key])};\n`;
+    }
+    for(let line of lines){
+        const checkResult = checkLine(line);
+        if(checkResult){
+            switch(checkResult.condition){
+                case 'if':
+                    code += `if(${checkResult.expr}){\n`;
+                    break;
+                case 'else':
+                    code += '}else{\n';
+                    break;
+                case 'elif':
+                    code += `}else if(${checkResult.expr}){\n`;
+                    break;
+                case 'endif':
+                    code += '}\n';
+                    break;
+            }
+        }else{
+            code += `${listVarName}.push(${JSON.stringify(line)});\n`
+        }
+    }
+    code += `return ${listVarName};
+})();`;
+
+    try{
+        const result = eval(code);
+        return result.join('\n');
+    }catch(e){
+        throw new Error('error condition');
+    }
+}
+
+
+function checkLine(line){
+    const matchResult = line.match(/\/{3,}[\s]*#(if|else|elif|endif)([\s]+[\s\S]*)?$/);
+
+    if(matchResult){
+        const checkResult = {condition:matchResult[1],expr:(matchResult[2]||'').trim()};
+        if(
+            (checkResult.condition==='if'||checkResult.condition==='elif')
+            &&
+            checkResult.expr===''
+            ){
+                return false;
+        }
+        return checkResult;
+    }
+
+    return false;
+}
+
+module.exports = parse;

yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+big.js@^3.1.3:
+  version "3.1.3"
+  resolved "https://registry.yarnpkg.com/big.js/-/big.js-3.1.3.tgz#4cada2193652eb3ca9ec8e55c9015669c9806978"
+
+emojis-list@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/emojis-list/-/emojis-list-2.1.0.tgz#4daa4d9db00f9819880c79fa457ae5b09a1fd389"
+
+json5@^0.5.0:
+  version "0.5.1"
+  resolved "https://registry.yarnpkg.com/json5/-/json5-0.5.1.tgz#1eade7acc012034ad84e2396767ead9fa5495821"
+
+loader-utils@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/loader-utils/-/loader-utils-1.1.0.tgz#c98aef488bcceda2ffb5e2de646d6a754429f5cd"
+  dependencies:
+    big.js "^3.1.3"
+    emojis-list "^2.0.0"
+    json5 "^0.5.0"