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R3600/invenio/utils/xmlDict.py
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xmlDict.py
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# -*- coding: utf-8 -*-
#
# The following code is authored by Duncan McGreggor and is licensed
# under PSF license. It was taken from
# <http://code.activestate.com/recipes/410469/>.
import six
import xml.etree.ElementTree as ElementTree
class XmlListConfig(list):
def __init__(self, aList):
for element in aList:
if element:
# treat like dict
if len(element) == 1 or element[0].tag != element[1].tag:
self.append(XmlDictConfig(element))
# treat like list
elif element[0].tag == element[1].tag:
self.append(XmlListConfig(element))
elif element.text:
text = element.text.strip()
if text:
self.append(text)
class XmlDictConfig(dict):
'''
Example usage:
>>> tree = ElementTree.parse('your_file.xml')
>>> root = tree.getroot()
>>> xmldict = XmlDictConfig(root)
Or, if you want to use an XML string:
>>> root = ElementTree.XML(xml_string)
>>> xmldict = XmlDictConfig(root)
And then use xmldict for what it is... a dict.
'''
def __init__(self, parent_element):
if parent_element.items():
self.update(dict(parent_element.items()))
for element in parent_element:
if element:
# treat like dict - we assume that if the first two tags
# in a series are different, then they are all different.
if len(element) == 1 or element[0].tag != element[1].tag:
aDict = XmlDictConfig(element)
# treat like list - we assume that if the first two tags
# in a series are the same, then the rest are the same.
else:
# here, we put the list in dictionary; the key is the
# tag name the list elements all share in common, and
# the value is the list itself
aDict = {element[0].tag: XmlListConfig(element)}
# if the tag has attributes, add those to the dict
if element.items():
aDict.update(dict(element.items()))
self.update({element.tag: aDict})
# this assumes that if you've got an attribute in a tag,
# you won't be having any text. This may or may not be a
# good idea -- time will tell. It works for the way we are
# currently doing XML configuration files...
elif element.items():
# this assumes that if we got a single attribute
# with no children the attribute defines the type of the text
if len(element.items()) == 1 and not list(element):
# check if its str or unicode and if the text is empty,
# otherwise the tag has empty text, no need to add it
if isinstance(element.text, six.string_types) and element.text.strip() != '':
# we have an attribute in the tag that specifies
# most probably the type of the text
tag = element.items()[0][1]
self.update({element.tag: dict({tag: element.text})})
else:
self.update({element.tag: dict(element.items())})
if not list(element) and isinstance(element.text, six.string_types)\
and element.text.strip() != '':
self[element.tag].update(dict({"text": element.text}))
# finally, if there are no child tags and no attributes, extract
# the text
else:
self.update({element.tag: element.text})
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