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greg used to be _why's fork of Ian Piumarta's peg/leg, with the following differences:

• Re-entrant
• Some bug fixes

Since then, better error handling and other various features have been added.

• Ian Piumarta's peg/leg
• 2004 PEG paper

The most comprehensive example of greg usage is innagaqueen,an ooc grammar, used inrock, anooc compiler written in ooc.

With a GCC-like compiler,make should give you a greg executable.

If you modifygreg.g (greg's own grammar is written in LEG), runmake grammar toregenerategreg.c using greg itself, then runmake again to build it.

• GitHub pull requests are the preferred way to submit contributions.
• Don't modifygreg.c, instead, modifygreg.g and regenerate it as shown above.
• Make sure greg is still self-hosting before you submit your code.
• Major changes warrant a version bump, but they also warrant discussions.

For a list of contributors, see theGitHub contributor graph.

peg/leg is copyright (c) 2007 by Ian Piumarta released under an MIT license. As is greg.