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# -*- coding: utf-8 -*-
"""
slixmpp.xmlstream.matcher.xpath
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Part of Slixmpp: The Slick XMPP Library
:copyright: (c) 2011 Nathanael C. Fritz
:license: MIT, see LICENSE for more details
"""
from slixmpp.xmlstream.stanzabase import ET, fix_ns
from slixmpp.xmlstream.matcher.base import MatcherBase
class MatchXPath(MatcherBase):
"""
The XPath matcher selects stanzas whose XML contents matches a given
XPath expression.
.. warning::
Using this matcher may not produce expected behavior when using
attribute selectors. For Python 2.6 and 3.1, the ElementTree
:meth:`~xml.etree.ElementTree.Element.find()` method does
not support the use of attribute selectors. If you need to
support Python 2.6 or 3.1, it might be more useful to use a
:class:`~slixmpp.xmlstream.matcher.stanzapath.StanzaPath` matcher.
If the value of :data:`IGNORE_NS` is set to ``True``, then XPath
expressions will be matched without using namespaces.
"""
def __init__(self, criteria):
self._criteria = fix_ns(criteria)
def match(self, xml):
"""
Compare a stanza's XML contents to an XPath expression.
If the value of :data:`IGNORE_NS` is set to ``True``, then XPath
expressions will be matched without using namespaces.
.. warning::
In Python 2.6 and 3.1 the ElementTree
:meth:`~xml.etree.ElementTree.Element.find()` method does not
support attribute selectors in the XPath expression.
:param xml: The :class:`~slixmpp.xmlstream.stanzabase.ElementBase`
stanza to compare against.
"""
if hasattr(xml, 'xml'):
xml = xml.xml
x = ET.Element('x')
x.append(xml)
return x.find(self._criteria) is not None
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