如何从法/ yacc的更多解析错误的信息？ [英] How to get more parse error information from lex / yacc?

问题描述

如何从法/ yacc的更多解析错误信息？

How to get more parse error information from lex / yacc?

目前在lex文件我使用：

Currently in the lex file I am using:

int yyerror(const char *msg)
{
    fprintf(stderr, "Parse error: %s\n", msg);
    return 0;
}

但是，当我运行我的程序的yyerror输出空白消息。我尝试添加yylineno和yytext中以YYERROR但这些原因编译错误。我尝试添加％错误详细的YACC文件
％选项调试的文件法但这些作出消息没有什么区别。

But when I run my program yyerror outputs a blank message. I tried adding yylineno and yytext to yyerror but these cause compilation errors. I tried adding "%error-verbose" to the yacc file and "%option debug" to the lex file but these made no difference to the message.

我也注意到这不过输出yyparse支架：'{'从我试图解析文件，我不知道这样做的意义

I did notice however that yyparse outputs a bracket: '{' from the file I am trying to parse, I don't know the significance of this.

我使用win_flex和win_bison。

I am using win_flex and win_bison.

推荐答案

这在很大程度上是在的官方野牛手动当它展示了如何使用的yyerror 来得到改进的错误消息。

Much of this is described in the official bison manual when it shows how to use yyerror to get improved error messages.

在特别的，它建议您使用％，在野牛声明部分详细定义parse.error得到增强的错误消息。

In particular, it suggests you use %define parse.error verbose in the Bison declarations section to get enhanced error messages.

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