The accidence and syntax analysis parts consist of the analysis of data stream of the input directive and the Fortran program. The latter is the emphasis of this article. Its hard core is the accidence analysis builder grammar_lexer.

• 词法分析和语法分析部分又分为输入命令数据流以及Fortran源程序数据流的词法分析和语法分析，后一部分是本文分析的重点，它以词法分析程序生成器grammar lexer.