说明：  Linux下词法和语法分析工具yacc和lex工具的文档。也是Gcc中词法和语法的分析工具。对做编解码和做编译器、解释器的朋友有很大的帮助。
(Linux under the lexical and syntax analysis tools yacc and lex tools documents. Gcc is also in morphology and syntax of the analysis tools. On the codec to do and make compiler, interpreter friend has a great help.)