帮我 做一个词法编译器（有要求）

The lexical structure of this toy programming language is defined as follows:

• comments: Comments starts with // characters and ends with the end of line
character.
• keywords: The keywords given in the grammar:
int double if then else while for
• identifiers: An identifier starts with a letter and continues with a letter or digit. A
keyword cannot be an identifier, and the maximum length of an identifier is 32 characters.
• operators: The followings are operators:
+ - / * = == < <= > >= !=
• delimiters: The followings are delimiters: ( ) { } ;
• numbers: The numbers are defined as follows:
digit  0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
intnumber  digit+ (the maximum integer number is 231)
exponent  E ( + | - |  ) digit+ (the maximum exponent value is

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