Include %token and %union declaration from a shared file

[Alexander Barkov]

Hello,


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.


Currently we just have two files grammar1.yy and grammar2.yy
with 100% identical %token and %union directives,
but this is inconvenient to maintain.

Is there a way to move %union and all %token directives
from *.yy file into a shared file, and include it from
grammar1.yy and grammar2.yy ?


Thanks!