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# -*- coding: utf-8 -*-
"""
sleekxmpp.xmlstream.tostring
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This module converts XML objects into Unicode strings and
intelligently includes namespaces only when necessary to
keep the output readable.
Part of SleekXMPP: The Sleek XMPP Library
:copyright: (c) 2011 Nathanael C. Fritz
:license: MIT, see LICENSE for more details
"""
import sys
if sys.version_info < (3, 0):
import types
def tostring(xml=None, xmlns='', stanza_ns='', stream=None,
outbuffer='', top_level=False):
"""Serialize an XML object to a Unicode string.
If namespaces are provided using ``xmlns`` or ``stanza_ns``, then
elements that use those namespaces will not include the xmlns attribute
in the output.
:param XML xml: The XML object to serialize.
:param string xmlns: Optional namespace of an element wrapping the XML
object.
:param string stanza_ns: The namespace of the stanza object that contains
the XML object.
:param stream: The XML stream that generated the XML object.
:param string outbuffer: Optional buffer for storing serializations
during recursive calls.
:param bool top_level: Indicates that the element is the outermost
element.
:type xml: :py:class:`~xml.etree.ElementTree.Element`
:type stream: :class:`~sleekxmpp.xmlstream.xmlstream.XMLStream`
:rtype: Unicode string
"""
# Add previous results to the start of the output.
output = [outbuffer]
# Extract the element's tag name.
tag_name = xml.tag.split('}', 1)[-1]
# Extract the element's namespace if it is defined.
if '}' in xml.tag:
tag_xmlns = xml.tag.split('}', 1)[0][1:]
else:
tag_xmlns = ''
default_ns = ''
stream_ns = ''
if stream:
default_ns = stream.default_ns
stream_ns = stream.stream_ns
# Output the tag name and derived namespace of the element.
namespace = ''
if top_level and tag_xmlns not in ['', default_ns, stream_ns] or \
tag_xmlns not in ['', xmlns, stanza_ns, stream_ns]:
namespace = ' xmlns="%s"' % tag_xmlns
if stream and tag_xmlns in stream.namespace_map:
mapped_namespace = stream.namespace_map[tag_xmlns]
if mapped_namespace:
tag_name = "%s:%s" % (mapped_namespace, tag_name)
output.append("<%s" % tag_name)
output.append(namespace)
# Output escaped attribute values.
for attrib, value in xml.attrib.items():
value = xml_escape(value)
if '}' not in attrib:
output.append(' %s="%s"' % (attrib, value))
else:
attrib_ns = attrib.split('}')[0][1:]
attrib = attrib.split('}')[1]
if stream and attrib_ns in stream.namespace_map:
mapped_ns = stream.namespace_map[attrib_ns]
if mapped_ns:
output.append(' %s:%s="%s"' % (mapped_ns,
attrib,
value))
if len(xml) or xml.text:
# If there are additional child elements to serialize.
output.append(">")
if xml.text:
output.append(xml_escape(xml.text))
if len(xml):
for child in xml.getchildren():
output.append(tostring(child, tag_xmlns, stanza_ns, stream))
output.append("</%s>" % tag_name)
elif xml.text:
# If we only have text content.
output.append(">%s</%s>" % (xml_escape(xml.text), tag_name))
else:
# Empty element.
output.append(" />")
if xml.tail:
# If there is additional text after the element.
output.append(xml_escape(xml.tail))
return ''.join(output)
def xml_escape(text):
"""Convert special characters in XML to escape sequences.
:param string text: The XML text to convert.
:rtype: Unicode string
"""
if sys.version_info < (3, 0):
if type(text) != types.UnicodeType:
text = unicode(text, 'utf-8', 'ignore')
text = list(text)
escapes = {'&': '&',
'<': '<',
'>': '>',
"'": ''',
'"': '"'}
for i, c in enumerate(text):
text[i] = escapes.get(c, c)
return ''.join(text)
|
