Re: How to raise an error

[Mike Aubury]

Why not something like :



 identifier:
   LOCALIDENTIFIER {
              $$ = CreateIdentifierNode(yytext);
              if ($$== NULL) {
                      YYERROR;
              }
   }


Then just get your CreateIdentifierNode to return NULL if its invalid..
(You can play with setting an error buffer string to set the actual
error message etc..)

In my code - I tend to do something like :

   LOCALIDENTIFIER {
              char errbuff[256];
              $$ = CreateIdentifierNode(yytext,errbuff);
              if ($$== NULL) {
                      yyerror(errbuff);
                      YYERROR;
              }
   }

Where CreateIdentifierNode sets 'errbuff' when "CreateIdentifierNode"
returns NULL..



2009/10/9 BradDaBug <address@hidden>:
>
> My parser basically works by calling various functions that build a big parse
> tree. Something like this:
>
> identifier:
>   LOCALIDENTIFIER { $$ = CreateIdentifierNode(yytext); }
>
> The problem is that I need to be able to detect errors within those
> functions (for example, is the identifier name too long) and propagate them
> back to Bison. But I don't know how. I don't have access to the YYERROR
> macro in those functions, and I can't manually "goto yyerrorlab;" since I'm
> in a different function.
>
> How can I do it?
> --
> View this message in context: 
> http://www.nabble.com/How-to-raise-an-error-tp25824253p25824253.html
> Sent from the Gnu - Bison - Help mailing list archive at Nabble.com.
>
>
>
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