词法分析，可是识别标示符，关键字，数字，等一些其他的符号，通过自己写好的标示符文件，自己定义一些标示符，一个一个字符的从读，然后写入文件，再从文件读出来进行词法分析。-Lexical analysis, but the identification of indicators, keywords, numbers, and some other symbols, through their own identifier written documents, their own definitions of some indicators, a character from the time, and then written into the document, and then read from the document out for lexical analysis.