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lexer-parser's Introduction

🎁Lexer-Parser

用java实现的词法分析和语法分析的小程序:flags:

概述

  • 词法分析： 根据输入的字符序列，将字符序列转换为单词Token序列，识别每个字符，并给出相应的类型
  • 语法分析： 根据给定的文法，判断是否是LL(1)文法，自顶向下分析。采用预测分析法：从文法开始符S 出发，从左到右扫描源程序，每次通过向前查看 1 个字符，选择合适的产生式，生成句子的最左推导。
  • 步骤：
  1. 从文件读入文法自动区分 终结符号VT 和 非终结符号VN
  2. 消除直接左递归
  3. 生成FIRST和FOLLOW集合
  4. 判断是否是LL(1)文法
  5. 构建预测分析表
  6. 输入要分析的单词串自动输出分析过程

📺结果图

  • 词法分析

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  • 语法分析

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  • 判断是否是LL（1）文法

在这里插入图片描述

代码结构

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使用说明

  • 将grammer文件夹放入F盘下，我在代码包中也附带了一个名为文法测试.txt的文件，里面有对应的四种文法以及需要输入的字符串示例。
  • 运行Main主函数，即可...

在这里插入图片描述

lexer-parser's People

Contributors

daq121 avatar

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