python3-parser

python3-parser-rb

A Python 3 parser for Ruby.

Usage

Parse some Python 3 code and walk over the parse tree with a visitor:

require 'python3-parser'

# from https://rosettacode.org/wiki/Roman_numerals/Decode#Python
python_code = <<~END
  _rdecode = dict(zip('MDCLXVI', (1000, 500, 100, 50, 10, 5, 1)))

  def decode(roman):
      result = 0
      for r, r1 in zip(roman, roman[1:]):
          rd, rd1 = _rdecode[r], _rdecode[r1]
          result += -rd if rd < rd1 else rd
      return result + _rdecode[roman[-1]]

  if __name__ == '__main__':
      for r in 'MCMXC MMVIII MDCLXVI'.split():
          print(r, decode(r))
END

class MyFuncVisitor < Python3Parser::Visitor
  def visit_funcdef(ctx)
    puts ctx.NAME.text
    visit_children(ctx)
  end
end

parser = Python3Parser::Parser.parse(python_code)
parser.visit(MyFuncVisitor.new)

The script above should print "decode" when executed, since decode is the only function defined in the Python code snippet.

Technology

Want to target Ruby with your own ANTLR grammars? Check out the antlr-gemerator.

Caveats

See the caveats listed in antlr4-native's README.

System Requirements

See the system requirements listed in antlr4-native's README.

License

Licensed under the MIT license. See LICENSE.txt for details.

Authors

• Cameron C. Dutro: http://github.com/camertron