词法分析的目的是将输入的源程序进行划分，给出基本符号（token）的序列，并掠过注解和空格等分隔符号。基本符号是与输入的语言定义的词法所规定的终结符。-Lexical analysis is the input source to be divided, given the basic symbol (token) sequence, and passing notes and spaces, such as separator. Basic symbols of the language cl