lexer重构，改为状态tag驱动的经典状态机 #33
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看上去似乎也看不出哪里性能有差距 |
dcy0701
reviewed
Apr 26, 2021
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lexer重构，加上了状态的tag，通过tag驱动流转，把tag部分拆分成了3个状态。
本来是为了提升可读性，结果意外的提升了性能，15%左右。
加入了context，之前叫state。在状态流转的过程中传递context