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# -*- coding: utf-8 -*-
# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of logilab-common.
#
# logilab-common is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option) any
# later version.
#
# logilab-common is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with logilab-common. If not, see <http://www.gnu.org/licenses/>.
"""XML utilities.
This module contains useful functions for parsing and using XML data. For the
moment, there is only one function that can parse the data inside a processing
instruction and return a Python dictionary.
"""
__docformat__ = "restructuredtext en"
import re
RE_DOUBLE_QUOTE = re.compile('([\w\-\.]+)="([^"]+)"')
RE_SIMPLE_QUOTE = re.compile("([\w\-\.]+)='([^']+)'")
def parse_pi_data(pi_data):
"""
Utility function that parses the data contained in an XML
processing instruction and returns a dictionary of keywords and their
associated values (most of the time, the processing instructions contain
data like ``keyword="value"``, if a keyword is not associated to a value,
for example ``keyword``, it will be associated to ``None``).
:param pi_data: data contained in an XML processing instruction.
:type pi_data: unicode
:returns: Dictionary of the keywords (Unicode strings) associated to
their values (Unicode strings) as they were defined in the
data.
:rtype: dict
"""
results = {}
for elt in pi_data.split():
if RE_DOUBLE_QUOTE.match(elt):
kwd, val = RE_DOUBLE_QUOTE.match(elt).groups()
elif RE_SIMPLE_QUOTE.match(elt):
kwd, val = RE_SIMPLE_QUOTE.match(elt).groups()
else:
kwd, val = elt, None
results[kwd] = val
return results