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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# XML handling functions
from StringIO import StringIO
from xml.parsers import expat
import xml.etree.ElementTree as et
from util import *
from elemutil import *
# Read a list of XML attributes
def readAttributes(a):
if a == ():
return a
return cons((attribute, "'" + car(car(a)), cadr(car(a))), readAttributes(cdr(a)))
# Read an XML element
def readElement(e):
a = tuple(e.items())
c = tuple(e.getchildren())
l = (element, "'" + e.tag) + readAttributes(a) + readElements(c)
if e.text == None or c != ():
return l
return l + (e.text,)
# Read a list of XML elements
def readElements(l):
if l == ():
return l
return cons(readElement(car(l)), readElements(cdr(l)))
# Return true if a list of strings represents an XML document
def isXML(l):
if isNil(l):
return False
if car(l)[0:5] != "<?xml":
return False
return True
# Parse a list of strings representing an XML document
class NamespaceParser(et.XMLTreeBuilder):
def __init__(self):
et.XMLTreeBuilder.__init__(self)
self._parser = parser = expat.ParserCreate(None)
parser.DefaultHandlerExpand = self._default
parser.StartElementHandler = self._start
parser.EndElementHandler = self._end
parser.CharacterDataHandler = self._data
try:
parser.buffer_text = 1
except AttributeError:
pass
try:
parser.ordered_attributes = 1
parser.specified_attributes = 1
parser.StartElementHandler = self._start_list
except AttributeError:
pass
def parseXML(l):
s = StringIO()
writeStrings(l, s)
parser = NamespaceParser()
parser.feed(s.getvalue())
return parser.close()
# Read a list of values from a list of strings representing an XML document
def readXML(l):
e = parseXML(l)
return (readElement(e),)
# Write a list of XML element and attribute tokens
def expandElementValues(n, l):
if isNil(l):
return l
return cons(cons(element, cons(n, car(l))), expandElementValues(n, cdr(l)))
def writeList(l, xml):
if isNil(l):
return xml
token = car(l)
if isTaggedList(token, attribute):
xml.attrib[attributeName(token)[1:]] = str(attributeValue(token))
elif isTaggedList(token, element):
if elementHasValue(token):
v = elementValue(token)
if isList(v):
e = expandElementValues(elementName(token), v)
writeList(e, xml)
else:
child = et.Element(elementName(token)[1:])
writeList(elementChildren(token), child)
xml.append(child)
else:
child = et.Element(elementName(token)[1:])
writeList(elementChildren(token), child)
xml.append(child)
else:
xml.text = str(token)
writeList(cdr(l), xml)
return xml
# Convert a list of values to a list of strings representing an XML document
def writeXML(l, xmlTag):
e = writeList(l, [])
if not xmlTag:
return (et.tostring(car(e)),)
return (et.tostring(car(e), "UTF-8") + "\n",)
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