词法分析器又称扫描器。词法分析是指将我们编写的文本代码流解析为一个一个的记号，分析得到的记号以供后续语法分析使用。词法分析器的工作是低级别的分析：将字符或者字符序列转化成记号。-Lexical analyzer, also known as scanners. Lexical analysis refers to the text of the code we write flow analysis for a token one, analyze the resulting syntax notation for subsequent analysis. Lexical analyzer' s job is low-level analysis: the character or sequence of characters converted into tokens.