野牛:错误消息中包括行号 [英] Bison : Line number included in the error messages

问题描述

好的，所以我想我的问题是不言自明的.

OK, so I suppose my question is quite self-explanatory.

我目前正在Bison中构建一个解析器，我想使错误报告更好一些.

I'm currently building a parser in Bison, and I want to make error reporting somewhat better.

当前，我设置了%define parse.error verbose(实际上会发出类似syntax error, unexpected ***********************, expecting ********************的消息.

Currently, I've set %define parse.error verbose (which actually gives messages like syntax error, unexpected ***********************, expecting ********************.

我只想在错误消息中添加更多信息，例如行号(在输入/文件/等中)

All I want is to add some more information in the error messages, e.g. line number (in input/file/etc)

我当前的yyerror(好吧...不寻常...大声笑):

My current yyerror (well nothing... unusual... lol) :

void yyerror(const char *str)
{
    fprintf(stderr,"\x1B[35mInterpreter : \x1B[37m%s\n",str);
}

---

PS

• 我已经阅读过最新的Bison文档，但是我似乎很迷路...
• 我还研究了%locations指令，该指令很可能非常接近我所需要的-但是，我仍然找不到完整的工作示例，并且不确定该如何使用.

• I've gone through the latest Bison documentation, but I seem quite lost...
• I've also had a look into the %locations directive, which most likely is very close to what I need - however, I still found no complete working example and I'm not sure how this is to be used.

推荐答案

所以，这里我有分步解决方案:

• 我们在语法文件中(在%}和第一个%%之间)添加了%locations指令
• 我们确保我们的词法分析器文件顶部包含解析器的包含内容(例如#include "mygrammar.tab.h")
• 我们在lexer文件中添加%option yylineno选项(在%}和第一个%%之间)

• We add the %locations directive in our grammar file (between %} and the first %%)
• We make sure that our lexer file contains an include for our parser (e.g. #include "mygrammar.tab.h"), at the top
• We add the %option yylineno option in our lexer file (between %} and the first %%)

现在，在我们的yyerror函数(应该在我们的lexer文件中)中，我们可以自由地使用此... yylineno (=正在处理的文件中的当前行) :

And now, in our yyerror function (which will supposedly be in our lexer file), we may freely use this... yylineno (= current line in file being processed) :

void yyerror(const char *str)
{
    fprintf(stderr,"Error | Line: %d\n%s\n",yylineno,str);
}

是的.就那么简单！ :-)

Yep. Simple as that! :-)

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