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import minidom
import xml.sax,xml.sax.handler
START_ELEMENT = "START_ELEMENT"
END_ELEMENT = "END_ELEMENT"
COMMENT = "COMMENT"
START_DOCUMENT = "START_DOCUMENT"
END_DOCUMENT = "END_DOCUMENT"
PROCESSING_INSTRUCTION = "PROCESSING_INSTRUCTION"
IGNORABLE_WHITESPACE = "IGNORABLE_WHITESPACE"
CHARACTERS = "CHARACTERS"
class PullDOM(xml.sax.ContentHandler):
def __init__(self):
self.firstEvent = [None, None]
self.lastEvent = self.firstEvent
self._ns_contexts = [{}] # contains uri -> prefix dicts
self._current_context = self._ns_contexts[-1]
def setDocumentLocator(self, locator): pass
def startPrefixMapping(self, prefix, uri):
self._ns_contexts.append(self._current_context.copy())
self._current_context[uri] = prefix
def endPrefixMapping(self, prefix):
del self._ns_contexts[-1]
def startElementNS(self, name, tagName , attrs):
if name[0]:
# When using namespaces, the reader may or may not
# provide us with the original name. If not, create
# *a* valid tagName from the current context.
if tagName is None:
tagName = self._current_context[name[0]] + ":" + name[1]
node = self.document.createElementNS(name[0], tagName)
else:
# When the tagname is not prefixed, it just appears as
# name[1]
node = self.document.createElement(name[1])
for aname,value in attrs.items():
if aname[0]:
qname = self._current_context[name[0]] + ":" + aname[1]
attr = self.document.createAttributeNS(name[0], qname)
else:
attr = self.document.createAttribute(name[0], name[1])
attr.value = value
node.setAttributeNode(qname, attr)
parent = self.curNode
node.parentNode = parent
if parent.childNodes:
node.previousSibling = parent.childNodes[-1]
node.previousSibling.nextSibling = node
self.curNode = node
self.lastEvent[1] = [(START_ELEMENT, node), None]
self.lastEvent = self.lastEvent[1]
#self.events.append((START_ELEMENT, node))
def endElementNS(self, name, tagName):
node = self.curNode
self.lastEvent[1] = [(END_ELEMENT, node), None]
self.lastEvent = self.lastEvent[1]
#self.events.append((END_ELEMENT, node))
self.curNode = node.parentNode
def comment(self, s):
node = self.document.createComment(s)
parent = self.curNode
node.parentNode = parent
if parent.childNodes:
node.previousSibling = parent.childNodes[-1]
node.previousSibling.nextSibling = node
self.lastEvent[1] = [(COMMENT, node), None]
self.lastEvent = self.lastEvent[1]
#self.events.append((COMMENT, node))
def processingInstruction(self, target, data):
node = self.document.createProcessingInstruction(target, data)
#self.appendChild(node)
parent = self.curNode
node.parentNode = parent
if parent.childNodes:
node.previousSibling = parent.childNodes[-1]
node.previousSibling.nextSibling = node
self.lastEvent[1] = [(PROCESSING_INSTRUCTION, node), None]
self.lastEvent = self.lastEvent[1]
#self.events.append((PROCESSING_INSTRUCTION, node))
def ignorableWhitespace(self, chars):
node = self.document.createTextNode(chars[start:start + length])
parent = self.curNode
node.parentNode = parent
if parent.childNodes:
node.previousSibling = parent.childNodes[-1]
node.previousSibling.nextSibling = node
self.lastEvent[1] = [(IGNORABLE_WHITESPACE, node), None]
self.lastEvent = self.lastEvent[1]
#self.events.append((IGNORABLE_WHITESPACE, node))
def characters(self, chars):
node = self.document.createTextNode(chars)
node.parentNode = self.curNode
self.lastEvent[1] = [(CHARACTERS, node), None]
self.lastEvent = self.lastEvent[1]
def startDocument(self):
node = self.curNode = self.document = minidom.Document()
node.parentNode = None
self.lastEvent[1] = [(START_DOCUMENT, node), None]
self.lastEvent = self.lastEvent[1]
#self.events.append((START_DOCUMENT, node))
def endDocument(self):
assert not self.curNode.parentNode
for node in self.curNode.childNodes:
if node.nodeType == node.ELEMENT_NODE:
self.document.documentElement = node
#if not self.document.documentElement:
# raise Error, "No document element"
self.lastEvent[1] = [(END_DOCUMENT, node), None]
#self.events.append((END_DOCUMENT, self.curNode))
class ErrorHandler:
def warning(self, exception):
print exception
def error(self, exception):
raise exception
def fatalError(self, exception):
raise exception
class DOMEventStream:
def __init__(self, stream, parser, bufsize):
self.stream = stream
self.parser = parser
self.bufsize = bufsize
self.reset()
def reset(self):
self.pulldom = PullDOM()
# This content handler relies on namespace support
self.parser.setFeature(xml.sax.handler.feature_namespaces,1)
self.parser.setContentHandler(self.pulldom)
def __getitem__(self, pos):
rc = self.getEvent()
if rc:
return rc
raise IndexError
def expandNode(self, node):
event = self.getEvent()
while event:
token, cur_node = event
if cur_node is node:
return
if token != END_ELEMENT:
cur_node.parentNode.appendChild(cur_node)
event = self.getEvent()
def getEvent(self):
if not self.pulldom.firstEvent[1]:
self.pulldom.lastEvent = self.pulldom.firstEvent
while not self.pulldom.firstEvent[1]:
buf=self.stream.read(self.bufsize)
if not buf:
#FIXME: why doesn't Expat close work?
#self.parser.close()
return None
self.parser.feed(buf)
rc = self.pulldom.firstEvent[1][0]
self.pulldom.firstEvent[1] = self.pulldom.firstEvent[1][1]
return rc
default_bufsize = (2 ** 14) - 20
# FIXME: move into sax package for common usage
def parse(stream_or_string, parser=None, bufsize=default_bufsize):
if type(stream_or_string) is type(""):
stream = open(stream_or_string)
else:
stream = stream_or_string
if not parser:
parser = xml.sax.make_parser()
return DOMEventStream(stream, parser, bufsize)
def parseString(string, parser=None):
try:
from cStringIO import StringIO
except ImportError:
from StringIO import StringIO
bufsize = len(string)
buf = StringIO(string)
if not parser:
parser = xml.sax.make_parser()
return DOMEventStream(buf, parser, bufsize)
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