On Dec 11, 4:23 pm, nnguyen <nguy...@gmail.com> wrote:
> I need expat to parse this block of xml:
>
> <datafield tag="991">
> <subfield code="b">c-P&P</subfield>
> <subfield code="h">LOT 3677</subfield>
> <subfield code="m">(F)</subfield>
> </datafield>
>
> I need to parse the xml and return a dictionary that follows roughly
> the same layout as the xml. Currently the code for the class handling
> this is:
>
> class XML2Map():
>
> def __init__(self):
> """ """
> self.parser = expat.ParserCreate()
>
> self.parser.StartElementHandler = self.start_element
> self.parser.EndElementHandler = self.end_element
> self.parser.CharacterDataHandler = self.char_data
>
> self.map = [] #not a dictionary
>
> self.current_tag = ''
> self.current_subfields = []
> self.current_sub = ''
> self.current_data = ''
>
> def parse_xml(self, xml_text):
> self.parser.Parse(xml_text, 1)
>
> def start_element(self, name, attrs):
> if name == 'datafield':
> self.current_tag = attrs['tag']
>
> elif name == 'subfield':
> self.current_sub = attrs['code']
>
> def char_data(self, data):
> self.current_data = data
>
> def end_element(self, name):
> if name == 'subfield':
> self.current_subfields.append([self.current_sub,
> self.current_data])
>
> elif name == 'datafield':
> self.map.append({'tag': self.current_tag, 'subfields':
> self.current_subfields})
> self.current_subfields = [] #resetting the values for next
> subfields
>
> Right now my problem is that when it's parsing the subfield element
> with the data "c-P&P", it's not taking the whole data, but instead
> it's breaking it into "c-P", "&", "P". i'm not an expert with expat,
> and I couldn't find a lot of information on how it handles specific
> entities.
>
> In the resulting map, instead of:
>
> {'tag': u'991', 'subfields': [[u'b', u'c-P&P'], [u'h', u'LOT 3677'],
> [u'm', u'(F)']], 'inds': [u' ', u' ']}
>
> I get this:
>
> {'tag': u'991', 'subfields': [[u'b', u'P'], [u'h', u'LOT 3677'],
> [u'm', u'(F)']], 'inds': [u' ', u' ']}
>
> In the debugger, I can see that current_data gets assigned "c-P", then
> "&", and then "P".
>
> Any ideas on any expat tricks I'm missing out on? I'm also inclined to
> try another parser that can keep the string together when there are
> entities, or at least ampersands.
I forgot, ignore the "'inds':..." in the output above, it's just
another part of the xml I had to parse that isn't important to this
discussion.
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