用c++语言和lex-yacc工具实现的文法工具,基本功能相当于一个c语言文法，在平台性编程和可配置编程中作用很大，增加程序的灵活性。-Using c++ language and tools in the lex-yacc grammar tools, basic function is equivalent to a c language grammar, the platform of programming and programming can be configured to pla