Python-based syntactic parser for Datasift's CSDL grammar (http://dev.datasift.com/csdl). This does not check semantics, but it will produce a valid AST.

Behind the scenes, this library depends on the excellent library pyparsing (http://pyparsing.wikispaces.com). Result returned are unadulterated structures from pyparsing.

from csdl.parser import parser
parsed = parser.parseString('twitter.text contains "Cincinnati Reds"')
assert parsed.asList() == [['twitter.text', 'contains', '"Cincinnati Reds"']]

To restrict what type of operators are acceptable:

from csdl.parser import CSDLParser
class MyParser(CSDLParser):
    def validateIdentifier(self, token):
        if token[0].startswith("interaction"):
            raise Exception("fail")        
parser = MyParser()
parser.parseString('twitter.text contains "Cincinnati Reds"')
assert_raises(Exception, parser.parseString, "interaction.geo exists")

python setup.py nosetests

The file tests/tests.yaml contains an extensive list of tests. Please add to it if you feel the need.

Copyright (C) 2012 Nino Walker

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.