96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2010 Nathanael C. Fritz
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This file is part of SleekXMPP.
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See the file LICENSE for copying permission.
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"""
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def tostring(xml=None, xmlns='', stanza_ns='', stream=None, outbuffer=''):
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"""
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Serialize an XML object to a Unicode string.
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If namespaces are provided using xmlns or stanza_ns, then elements
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that use those namespaces will not include the xmlns attribute in
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the output.
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Arguments:
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xml -- The XML object to serialize. If the value is None,
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then the XML object contained in this stanza
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object will be used.
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xmlns -- Optional namespace of an element wrapping the XML
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object.
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stanza_ns -- The namespace of the stanza object that contains
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the XML object.
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stream -- The XML stream that generated the XML object.
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outbuffer -- Optional buffer for storing serializations during
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recursive calls.
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"""
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# Add previous results to the start of the output.
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output = [outbuffer]
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# Extract the element's tag name.
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tag_name = xml.tag.split('}', 1)[-1]
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# Extract the element's namespace if it is defined.
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if '}' in xml.tag:
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tag_xmlns = xml.tag.split('}', 1)[0][1:]
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else:
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tag_xmlns = ''
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# Output the tag name and derived namespace of the element.
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namespace = ''
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if tag_xmlns not in ['', xmlns, stanza_ns]:
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namespace = ' xmlns="%s"' % tag_xmlns
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if stream and tag_xmlns in stream.namespace_map:
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mapped_namespace = stream.namespace_map[tag_xmlns]
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if mapped_namespace:
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tag_name = "%s:%s" % (mapped_namespace, tag_name)
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output.append("<%s" % tag_name)
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output.append(namespace)
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# Output escaped attribute values.
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for attrib, value in xml.attrib.items():
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if '{' not in attrib:
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value = xml_escape(value)
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output.append(' %s="%s"' % (attrib, value))
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if len(xml) or xml.text:
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# If there are additional child elements to serialize.
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output.append(">")
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if xml.text:
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output.append(xml_escape(xml.text))
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if len(xml):
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for child in xml.getchildren():
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output.append(tostring(child, tag_xmlns, stanza_ns, stream))
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output.append("</%s>" % tag_name)
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elif xml.text:
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# If we only have text content.
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output.append(">%s</%s>" % (xml_escape(xml.text), tag_name))
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else:
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# Empty element.
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output.append(" />")
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if xml.tail:
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# If there is additional text after the element.
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output.append(xml_escape(xml.tail))
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return ''.join(output)
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def xml_escape(text):
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"""
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Convert special characters in XML to escape sequences.
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Arguments:
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text -- The XML text to convert.
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"""
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text = list(text)
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escapes = {'&': '&',
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'<': '<',
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'>': '>',
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"'": ''',
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'"': '"'}
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for i, c in enumerate(text):
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text[i] = escapes.get(c, c)
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return ''.join(text)
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