Re: Forcing Bison's yacc.c to report more expected tokens on syntax error

Hi Kevin, hi Akim,

I can imagine cases where having a longer list of expected tokens might be useful.
However, I wouldn’t like to have them in a string stitched together by bison, but instead I would like to have access to them in a std::vector<TokenId> or something similar.
That way, I could do some post-processing of the expected token list (e.g., expand the “variable_name” token to all variables which are currently in scope).
The result could then be integrated with, e.g., a dropdown list for autocompletion pretty nicely :)

Having programmatic access to the list of expected tokens would probably also solve Kevin’s request for reporting more than 5 tokens: he could just do it himself in his own code after getting the token list from Bison.

Cheers,
Adrian

From: help-bison <[email protected]> on behalf of Akim Demaille <[email protected]>
Date: Wednesday, 6 February 2019 at 10:43
To: Kevin Villela <[email protected]>
Cc: Bison Help <[email protected]>
Subject: Re: Forcing Bison's yacc.c to report more expected tokens on syntax error

Hi Kevin,

> Le 6 févr. 2019 à 03:01, Kevin Villela <[email protected]> a écrit :
>
> Hi all, I saw that the yacc.c skeleton only supports reporting a maximum or
> 5 expected tokens. The page
> <https://www.gnu.org/software/bison/manual/html_node/LAC.html<https://www.gnu.org/software/bison/manual/html_node/LAC.html>> on
> Look-Ahead Correction states this is "because of internationalization
> considerations". I was wondering if I would be able to contribute a
> configuration option to increase this number arbitrarily, or even just up
> to a higher number (e.g. 30) ?

The thing is that it's unclear that it actually helps to report all the possibilities when there are too many.
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