Hi all,

I'm writing a code generator that needs to parse a YACC-like input file (including partially parsing the C/C++ parts of the head and tail sections), as well as a LEX-like input file.

I figured I would start with existing YACC and LEX grammars, and modify them to add my new features. Unfortunately, I'm having trouble finding suitable Perl tools for parsing YACC, LEX, C, and C++. (I know the latter two are hard--I only need a partial parsing.) Do anyone know where I can find grammars for these languages?

Here's what my research has uncovered:

Parsing a YACC file

Parsing a LEX file

  • I can't find a suitable grammar anywhere. :(
Parsing C/C++

  • I could try Inline::C::ParseRegExp or Inline::C::ParseRecDescent for C, and Inline::CPP::grammar for C++.
  • Parse::RecDescent has a pretty functional demo_Cgrammar.pl, but the demo_cpp.pl seems a bit limited.
  • PERCEPS (http://starship.python.net/crew/tbryan/PERCEPS/) is a Perl header file parser. Not sure how well it would work for the head section of a YACC or LEX input file.
In the worst case, both the bison and flex distributions have grammars, which I could adapt to suitable input for Parse::RecDescent or Parse::Yapp. But I can't help but think that someone has already done all this work.

I need to fully parse the YACC and LEX input files, but for the C and C++ code I just need to locate any definitions so that I can move them to an implementation file and replace them with "extern" declarations. (I'm generating multiple source files from the YACC/LEX files, instead of the normal one big implementation file.)

Thanks for the help!
David

In reply to In search of grammars for parsing by coppit

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