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Re: How to ignore a token if it doesn't fit in with a rule?
From: |
Akim Demaille |
Subject: |
Re: How to ignore a token if it doesn't fit in with a rule? |
Date: |
Tue, 26 Jul 2011 13:20:42 +0200 |
Le 23 juil. 2011 à 20:17, uclacasey a écrit :
>
> Perhaps is there any way to get feedback from the parser? For example, if it
> is about to output a specific error message, I could intercept that error
> message, revert, and pass a different token?
>
> p.s: if anything sounds outlandish, it's because I'm relatively new to this
That does ring any bell to me, I wouldn't know how to do that. Maybe you could
try another way: the scanner ignores the comments (in the sense that it does
not return a token for them), but stores them somewhere. Then your parser
actions read that place to check if some comment was left for it. You could
even have a nonterminal symbol in charge of checking for this comment and do
something about it.