Hi, all,
I would like to do with sax processors what I can do with the document()
function in xslt, namely include other documents into the one that's being
parsed.
Here's a sample handler, and three xml files. This approach seems to work for
simple cases, but appears to break the innards of the handler (described
below):
# ----------------------------------------------------------------------
# chaining handler
class FooHandler(xml.sax.handler.ContentHandler):
def characters(self, data):
print data
def include_proc(self, href):
filter = xml.sax.make_parser()
filter.setContentHandler(self)
filter.parse(href)
def startElement(self, name, attrs):
if name == 'include':
self.include_proc(attrs.get('href'))
# ----------------------------------------------------------------------
# some xml files to work with:
# file1.xml:
#
<?xml version='1.0'?>
<foo>
<bar>This is file1</bar>
<include href='file3.xml' />
</foo>
# file2.xml:
#
<?xml version='1.0'?>
<foo>
<bar>This is file2</bar>
<include href='file3.xml' />
<bar>Back in file2 again after include</bar>
</foo>
# file3.xml:
#
<?xml version='1.0'?>
<foo>
<bar>This is file3.</bar>
</foo>
# ----------------------------------------------------------------------
# results (with whitespace removed):
>>> filter = xml.sax.make_parser()
>>> handler = FooHandler()
>>> filter.setContentHandler(handler)
>>> filter.parse('file1.xml')
This is file1
This is file3.
>>> filter.parse('file2.xml')
This is file2
This is file3.
Back in file2 again after include
>>>
So this seems to work in a simple case. w00t! But in a more involved handler,
I get errors like "weakly-referenced object no longer exists" when I try to
access the document locator after re-entering.
Can anyone tell me what I'm doing wrong?
Many thanks for any help,
Jed
--
Jed Parsons / Industrial Light + Magic : 415.448.2974
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