Hi Matthias.
> Hi Simon,
>
> depending on your grammar, you might treat the keyword as an identifier and
> just throw a warning in the lexer:
>
>
>
> "banana" {
> if (!SUPPORTS_KEYWORD(yyextra->config.std)) {
>
> fprintf(stderr, "warning: `banana' keyword not available\n");
>
> return TOK_ID;
> }
> return TOK_KW_BANANA;
> }
This won't work as depending on the -std you may either use "banana" as
keyword or as identifier - and you won't want a warning for the second one.
>
> Alternatively, semantic predicates might help you:
>
> http://www.gnu.org/software/bison/manual/bison.html#Semantic-Predicates
This looks very nice, although it would main to always use the words as
keywords, wich won't help for the "this is an identifier, not a
keyword"-issue.
But Semantic Predicates are nice (did not know about Bison supporting
this before), so it likely help with other issues ;-)
>
>
>
> Or the lexer could store the last few keywords in a global list and --instead
> of parsing `unexpected %s'-- yyerror uses this list.
> But I am not sure about that one, I would expect its success depends
heavily on the parser-algorithm.
Seems a little bit like the suggestion from Hans, I'll have a look at
this later.
>
>
> Cheers,
> Matthias
>
>
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