编译原理（三）词法分析、正规式、正规文法、NFA、DFA、最小化DFA

淡淡的烟草味﹌ 2023-02-18 08:22 6阅读 0赞

话不多说，本文要点总结如图：  
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# 3.1 词法分析程序的设计 #

**词法分析（lexical analysis）功能**：  
逐个读入源程序字符，输出“单词符号” ，供语法分析使用。  
**主要任务**：  
读源程序，产生单词符号  
**其他任务**：  
滤掉空格，跳过注释、换行符  
追踪换行标志，复制出错源程序  
宏展开，……  
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# 3.2 单词的描述工具 #

单词的描述工具和识别工具：

1.  **正规文法**（正则文法、3型文法）
2.  **正规式**（正则式）
3.  **有穷自动机**（NFA、DFA）

三者之间可以相互转换  
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# 3.3 有穷自动机（FA） #

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# 3.4 正规式和有穷自动机的等价性 #

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# 3.5 正规文法和有穷自动机的等价性 #

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# 3.6 词法分析程序的自动构造工具 #

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