A Python 3 parser for Ruby.
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.
Want to target Ruby with your own ANTLR grammars? Check out the antlr-gemerator.
See the caveats listed in antlr4-native's README.
See the system requirements listed in antlr4-native's README.
Licensed under the MIT license. See LICENSE.txt for details.
- Cameron C. Dutro: http://github.com/camertron