如何将匹配字符串的yyleng从Lex发送到Yacc? [英] How can I send the yyleng of a matched string from Lex to Yacc?

问题描述

请尝试将匹配字符串的yyleng从我的(.l)文件传递到(.y)文件.这是问题的一个示例:

Please i am trying to pass the yyleng of a matched string from my (.l) file to the (.y) file. Here is a sample of the issue:

在Lex文件中:

<state1>.+    {   fprintf(yyout, "%d", yyleng);    } 

在Yacc文件中:

/*我需要知道用于接收yacc文件的特定yyleng的方法.我应该使用全局变量吗?还是有解决此问题的特定方法? */

/* I need to know the methodology used to receive a specific yyleng to the yacc file. Shall I use global variables? or there is a specific way for dealing with this issue? */

在此先感谢您的帮助！ 〜任何建议都将受到高度赞赏.

Thanks in advance for your help! ~ Any suggestions are highly appreciated.

推荐答案

yyleng是全局变量；在语法文件中声明它并使用它.

yyleng is a global variable; declare it in your grammar file and use it.

Flex使用:

typedef size_t yy_size_t;
extern yy_size_t yyleng;

Lex使用:

extern int yyleng;

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