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import minidom
import types
import string
import sys
from xml.sax import ExpatParser
#todo: SAX2/namespace handling
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:
def __init__( self ):
self.firstEvent=[None,None]
self.lastEvent=self.firstEvent
def setDocumentLocator( self, locator ): pass
def startElement( self, tagName , attrs ):
if not hasattr( self, "curNode" ):
# FIXME: hack!
self.startDocument( )
node = self.document.createElement( tagName ) #FIXME namespaces!
for attr in attrs.keys():
node.setAttribute( attr, attrs[attr] )
parent=self.curNode
node.parentNode = parent
if parent.childNodes:
node.previousSibling=parent.childNodes[-1]
node.previousSibling.nextSibling=node
self.curNode = node
# FIXME: do I have to screen namespace attributes
self.lastEvent[1]=[(START_ELEMENT, node), None ]
self.lastEvent=self.lastEvent[1]
#self.events.append( (START_ELEMENT, node) )
def endElement( self, name ):
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()
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
# FIXME: sax2
#def _getParser( ):
# from xml.sax.saxexts import make_parser
# expat doesn't report errors properly! Figure it out
# return make_parser()
# return make_parser("xml.sax.drivers.drv_xmllib")
def _getParser():
return ExpatParser()
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 ) == type( "" ):
stream=open( stream_or_string )
else:
stream=stream_or_string
if not parser:
parser=_getParser()
return DOMEventStream( stream, parser, bufsize )
def parseString( string, parser=None ):
try:
import cStringIO
stringio=cStringIO.StringIO
except ImportError:
import StringIO
stringio=StringIO.StringIO
bufsize=len( string )
buf=stringio( string )
parser=_getParser()
return DOMEventStream( buf, parser, bufsize )
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