实现一个扫描器（词法分析程序）输入——源程序文件或源程序字符串,输出——相应的Token序列,关键字表和界符表及符号表和常数表 -The realization of a scanner (lexical analysis program) input- source file or source code string, the output- the corresponding Token sequence, keyword table and sector address table

its4是一个静态检测源代码的工具，它是基于词法分析的。-its4 a static tool for detection of the source code, it is based on lexical analysis.