Re: Include %token and %union declaration from a shared file

[Alexander Barkov]

Hi Hans,

Thanks for your replies.

We're inclined toward generating the *.yy files with help of some text
pre-processor. Possibly, using some CMake commands...

It would be great though if bison could collect the grammar definition
from multiple files. Where can I post this feature request?

Thanks!

On 07/08/2016 04:39 PM, Hans Åberg wrote:
> > On 7 Jul 2016, at 14:47, Alexander Barkov <address@hidden> wrote:
>
> > In our application we need to have two parsers using:
> >
> > - the same yylex function (the tokenizer)
> > - the same set of terminal symbols (%token)
> > - the same YYSTYPE structure (%union)
> >
> > but implementing very different syntax rules.
>
> One other possibility might be to implement two grammars headed by two dummy 
> tokens not used otherwise:
>    start:
>        "foo" grammar1
>      | "bar” grammar2
>    ;
>
>    grammar1: …
>
>    grammar2: …
>
> When the parsers start, insert one of the tokens first to select the grammar.