C predicates - Githubissues

arithy / packcc

A parser generator for C

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Closed andrewchambers closed 3 years ago

andrewchambers commented 3 years ago

Would it be possible to allow C predicates to participate in matching?

For example:

foonumber <- <[0-9]+> ?? { atoi($1) > 50 }

arithy commented 3 years ago

It's an interesting functionality. However, I don't plan to realize it due to the reasons below:

PackCC is designed to see just syntax, not semantics. That is, PackCC recognizes all inputs as a structure of strings, and doesn't care their meanings (like numeric values).
The semantics should be cared in the next phase after PackCC's processing.
I hope PackCC is kept as simple as possible.

andrewchambers commented 3 years ago

No problem, thanks for explaining.