Re: Print expected tokens in yyerror function.

[Hans Aberg]

On 8 Mar 2008, at 17:47, Necrosoft wrote:

> I would know the expected token in a parser (GLR also..l) when yyerror
> function is invoked. For example:
>
> A = aB | bB
> B = b | c
> etc....
>
> if the string in input is "ad$", in yyerror I would capture correct  
> tokens
> expected...like b or c.
>
> Ho I can make that?

It prints something like that (or used to), but the LALR(1) that  
Bison uses compacts the statements in a way that when an error token  
appears in the input, additional reduction can be performed. So to  
get a fully correct error handling, including tokens, LR without this  
type of compaction, or some search algorithm would be needed.

  Hans Aberg