Comments (3)
if (i == j)
a = 1
等价于 if (i == j)\n\t\ta = 1
<class, string>叫做token
eg:
foo = 42
<Id, 'foo'> <Op, '='> <Int, 42>
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正则表达式是是用来集合多语义 对 一种语法的映射关系。例如 +d 标识数字。
keyword
Integer
Identifier
whitespace
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Finite Automata 有限自动机
- A / B 为 state。输入0 或 1 对应进入不同的状态。
DFA 和 NFA
RegExp to NFA
NFA to DFA
https://www.bilibili.com/video/BV17K4y147Bz?p=15&spm_id_from=pageDriver
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Related Issues (3)
- P1 / P2 Introduction HOT 1
- 程序的一生 HOT 1
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