实现源程序输入串中注释、续行符的删除，换行符和Tab的替换，大写字母变换，得到预处理后的文本串，为单词识别做好准备。-Realization of input strings in the source notes, continued at the deleted line, newlines, and Tab replacement, capital letters transform, obtained after pretreatment of the text string, ready for word recognition.