以文本文件形式输入源程序，并对源程序从左到右进行扫描，对组成源程序的字符串拼接成为单词；并把其转换成属性字输出到文件中。-In the form of a text file input source, and source code to scan from left to right, to the composition of a string of source code splicing into words and to convert it into a property of