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# -*- coding: utf-8 -*-
"""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.
:copyright: 2009 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: General Public License version 2 - http://www.gnu.org/licenses
"""
__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
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