pyg: PEG parsing runtime for Python
a project by rneuhauser
Updated about 4 years ago. No love.

pyg will be a PEG parser library formed as an internal Python DSL. it will be used in cramex, a copycat of cram with expect support.

The surface is heading to resemble Boost.Spirit: grammars are composed using a vaguely (xBNF/PEG)-like syntax enabled through operator overloading.

>>> from pyg import Rule, chr, int

>>> n = Rule('number') >>> o = Rule('operator') >>> e = Rule('expression')

>>> e %= n >> o >> n >>> o %= chr('+-') >>> n %= int

>>> e.matches('42 + 69') True, None >>> e.matches('69') True, None >>> e.matches('42 69') False, "Failed on line 1 column 3:\n42 69\n ^\n"

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python parsing peg

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Activity

  • over 10 years ago: rneuhauser added keyword "python" to this project.
  • over 10 years ago: rneuhauser added keyword "parsing" to this project.
  • over 10 years ago: rneuhauser added keyword "peg" to this project.
  • over 10 years ago: rneuhauser started this project.
  • over 10 years ago: rneuhauser originated this project.


    • Comments

    • rneuhauser
      over 10 years ago by rneuhauser | Reply

      https://github.com/roman-neuhauser/py-impala - Import packages and modules from arbitrary directories and files

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