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#
# ElementTree
# $Id: SimpleXMLTreeBuilder.py 1862 2004-06-18 07:31:02Z Fredrik $
#
# A simple XML tree builder, based on Python's xmllib
#
# Note that due to bugs in xmllib, this builder does not fully support
# namespaces (unqualified attributes are put in the default namespace,
# instead of being left as is). Run this module as a script to find
# out if this affects your Python version.
#
# history:
# 2001-10-20 fl created
# 2002-05-01 fl added namespace support for xmllib
# 2002-08-17 fl added xmllib sanity test
#
# Copyright (c) 1999-2004 by Fredrik Lundh. All rights reserved.
#
# fredrik@pythonware.com
# http://www.pythonware.com
#
# --------------------------------------------------------------------
# The ElementTree toolkit is
#
# Copyright (c) 1999-2004 by Fredrik Lundh
#
# By obtaining, using, and/or copying this software and/or its
# associated documentation, you agree that you have read, understood,
# and will comply with the following terms and conditions:
#
# Permission to use, copy, modify, and distribute this software and
# its associated documentation for any purpose and without fee is
# hereby granted, provided that the above copyright notice appears in
# all copies, and that both that copyright notice and this permission
# notice appear in supporting documentation, and that the name of
# Secret Labs AB or the author not be used in advertising or publicity
# pertaining to distribution of the software without specific, written
# prior permission.
#
# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
# ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
# --------------------------------------------------------------------
##
# Tools to build element trees from XML files, using <b>xmllib</b>.
# This module can be used instead of the standard tree builder, for
# Python versions where "expat" is not available (such as 1.5.2).
# <p>
# Note that due to bugs in <b>xmllib</b>, the namespace support is
# not reliable (you can run the module as a script to find out exactly
# how unreliable it is on your Python version).
##
import xmllib, string
import ElementTree
##
# ElementTree builder for XML source data.
#
# @see elementtree.ElementTree
class TreeBuilder(xmllib.XMLParser):
def __init__(self, html=0):
self.__builder = ElementTree.TreeBuilder()
if html:
import htmlentitydefs
self.entitydefs.update(htmlentitydefs.entitydefs)
xmllib.XMLParser.__init__(self)
##
# Feeds data to the parser.
#
# @param data Encoded data.
def feed(self, data):
xmllib.XMLParser.feed(self, data)
##
# Finishes feeding data to the parser.
#
# @return An element structure.
# @defreturn Element
def close(self):
xmllib.XMLParser.close(self)
return self.__builder.close()
def handle_data(self, data):
self.__builder.data(data)
handle_cdata = handle_data
def unknown_starttag(self, tag, attrs):
attrib = {}
for key, value in attrs.items():
attrib[fixname(key)] = value
self.__builder.start(fixname(tag), attrib)
def unknown_endtag(self, tag):
self.__builder.end(fixname(tag))
def fixname(name, split=string.split):
# xmllib in 2.0 and later provides limited (and slightly broken)
# support for XML namespaces.
if " " not in name:
return name
return "{%s}%s" % tuple(split(name, " ", 1))
if __name__ == "__main__":
import sys
# sanity check: look for known namespace bugs in xmllib
p = TreeBuilder()
text = """\
<root xmlns='default'>
<tag attribute='value' />
</root>
"""
p.feed(text)
tree = p.close()
status = []
# check for bugs in the xmllib implementation
tag = tree.find("{default}tag")
if tag is None:
status.append("namespaces not supported")
if tag is not None and tag.get("{default}attribute"):
status.append("default namespace applied to unqualified attribute")
# report bugs
if status:
print "xmllib doesn't work properly in this Python version:"
for bug in status:
print "-", bug
else:
print "congratulations; no problems found in xmllib"
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