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fb73bb129b
Allow application to set a new content handler and lex_prop handler during parsing. Closes bug #433761. Small hack to make expat be ignored in Jython.
262 lines
8.7 KiB
Python
262 lines
8.7 KiB
Python
"""
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SAX driver for the Pyexpat C module. This driver works with
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pyexpat.__version__ == '2.22'.
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"""
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version = "0.20"
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from xml.sax._exceptions import *
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# xml.parsers.expat does not raise ImportError in Jython
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import sys
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if sys.platform[ : 4] == "java":
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raise SAXReaderNotAvailable("expat not available in Java", None)
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del sys
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try:
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from xml.parsers import expat
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except ImportError:
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raise SAXReaderNotAvailable("expat not supported",None)
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from xml.sax import xmlreader, saxutils, handler
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AttributesImpl = xmlreader.AttributesImpl
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AttributesNSImpl = xmlreader.AttributesNSImpl
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import string
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# --- ExpatParser
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class ExpatParser(xmlreader.IncrementalParser, xmlreader.Locator):
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"SAX driver for the Pyexpat C module."
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def __init__(self, namespaceHandling=0, bufsize=2**16-20):
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xmlreader.IncrementalParser.__init__(self, bufsize)
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self._source = xmlreader.InputSource()
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self._parser = None
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self._namespaces = namespaceHandling
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self._lex_handler_prop = None
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self._parsing = 0
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self._entity_stack = []
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# XMLReader methods
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def parse(self, source):
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"Parse an XML document from a URL or an InputSource."
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source = saxutils.prepare_input_source(source)
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self._source = source
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self.reset()
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self._cont_handler.setDocumentLocator(self)
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xmlreader.IncrementalParser.parse(self, source)
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def prepareParser(self, source):
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if source.getSystemId() != None:
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self._parser.SetBase(source.getSystemId())
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# Redefined setContentHandle to allow changing handlers during parsing
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def setContentHandler(self, handler):
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xmlreader.IncrementalParser.setContentHandler(self, handler)
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if self._parsing:
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self._reset_cont_handler()
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def getFeature(self, name):
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if name == handler.feature_namespaces:
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return self._namespaces
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raise SAXNotRecognizedException("Feature '%s' not recognized" % name)
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def setFeature(self, name, state):
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if self._parsing:
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raise SAXNotSupportedException("Cannot set features while parsing")
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if name == handler.feature_namespaces:
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self._namespaces = state
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else:
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raise SAXNotRecognizedException("Feature '%s' not recognized" %
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name)
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def getProperty(self, name):
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if name == handler.property_lexical_handler:
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return self._lex_handler_prop
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raise SAXNotRecognizedException("Property '%s' not recognized" % name)
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def setProperty(self, name, value):
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if name == handler.property_lexical_handler:
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self._lex_handler_prop = value
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if self._parsing:
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self._reset_lex_handler_prop()
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else:
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raise SAXNotRecognizedException("Property '%s' not recognized" % name)
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# IncrementalParser methods
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def feed(self, data, isFinal = 0):
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if not self._parsing:
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self.reset()
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self._parsing = 1
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self._cont_handler.startDocument()
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try:
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# The isFinal parameter is internal to the expat reader.
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# If it is set to true, expat will check validity of the entire
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# document. When feeding chunks, they are not normally final -
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# except when invoked from close.
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self._parser.Parse(data, isFinal)
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except expat.error:
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error_code = self._parser.ErrorCode
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exc = SAXParseException(expat.ErrorString(error_code), None, self)
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# FIXME: when to invoke error()?
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self._err_handler.fatalError(exc)
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def close(self):
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if self._entity_stack:
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# If we are completing an external entity, do nothing here
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return
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self.feed("", isFinal = 1)
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self._cont_handler.endDocument()
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self._parsing = 0
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# break cycle created by expat handlers pointing to our methods
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self._parser = None
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def _reset_cont_handler(self):
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self._parser.ProcessingInstructionHandler = \
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self._cont_handler.processingInstruction
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self._parser.CharacterDataHandler = self._cont_handler.characters
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def _reset_lex_handler_prop(self):
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self._parser.CommentHandler = self._lex_handler_prop.comment
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self._parser.StartCdataSectionHandler = self._lex_handler_prop.startCDATA
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self._parser.EndCdataSectionHandler = self._lex_handler_prop.endCDATA
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def reset(self):
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if self._namespaces:
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self._parser = expat.ParserCreate(None, " ")
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self._parser.StartElementHandler = self.start_element_ns
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self._parser.EndElementHandler = self.end_element_ns
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else:
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self._parser = expat.ParserCreate()
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self._parser.StartElementHandler = self.start_element
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self._parser.EndElementHandler = self.end_element
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self._reset_cont_handler()
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self._parser.UnparsedEntityDeclHandler = self.unparsed_entity_decl
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self._parser.NotationDeclHandler = self.notation_decl
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self._parser.StartNamespaceDeclHandler = self.start_namespace_decl
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self._parser.EndNamespaceDeclHandler = self.end_namespace_decl
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self._decl_handler_prop = None
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if self._lex_handler_prop:
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self._reset_lex_handler_prop()
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# self._parser.DefaultHandler =
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# self._parser.DefaultHandlerExpand =
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# self._parser.NotStandaloneHandler =
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self._parser.ExternalEntityRefHandler = self.external_entity_ref
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self._parsing = 0
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self._entity_stack = []
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# Locator methods
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def getColumnNumber(self):
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if self._parser is None:
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return None
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return self._parser.ErrorColumnNumber
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def getLineNumber(self):
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if self._parser is None:
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return 1
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return self._parser.ErrorLineNumber
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def getPublicId(self):
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return self._source.getPublicId()
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def getSystemId(self):
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return self._source.getSystemId()
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# event handlers
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def start_element(self, name, attrs):
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self._cont_handler.startElement(name, AttributesImpl(attrs))
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def end_element(self, name):
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self._cont_handler.endElement(name)
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def start_element_ns(self, name, attrs):
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pair = string.split(name)
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if len(pair) == 1:
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pair = (None, name)
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else:
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pair = tuple(pair)
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newattrs = {}
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for (aname, value) in attrs.items():
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apair = string.split(aname)
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if len(apair) == 1:
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apair = (None, aname)
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else:
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apair = tuple(apair)
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newattrs[apair] = value
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self._cont_handler.startElementNS(pair, None,
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AttributesNSImpl(newattrs, {}))
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def end_element_ns(self, name):
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pair = string.split(name)
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if len(pair) == 1:
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pair = (None, name)
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else:
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pair = tuple(pair)
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self._cont_handler.endElementNS(pair, None)
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# this is not used (call directly to ContentHandler)
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def processing_instruction(self, target, data):
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self._cont_handler.processingInstruction(target, data)
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# this is not used (call directly to ContentHandler)
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def character_data(self, data):
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self._cont_handler.characters(data)
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def start_namespace_decl(self, prefix, uri):
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self._cont_handler.startPrefixMapping(prefix, uri)
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def end_namespace_decl(self, prefix):
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self._cont_handler.endPrefixMapping(prefix)
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def unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
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self._dtd_handler.unparsedEntityDecl(name, pubid, sysid, notation_name)
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def notation_decl(self, name, base, sysid, pubid):
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self._dtd_handler.notationDecl(name, pubid, sysid)
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def external_entity_ref(self, context, base, sysid, pubid):
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source = self._ent_handler.resolveEntity(pubid, sysid)
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source = saxutils.prepare_input_source(source,
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self._source.getSystemId() or
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"")
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self._entity_stack.append((self._parser, self._source))
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self._parser = self._parser.ExternalEntityParserCreate(context)
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self._source = source
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try:
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xmlreader.IncrementalParser.parse(self, source)
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except:
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return 0 # FIXME: save error info here?
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(self._parser, self._source) = self._entity_stack[-1]
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del self._entity_stack[-1]
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return 1
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# ---
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def create_parser(*args, **kwargs):
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return apply(ExpatParser, args, kwargs)
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# ---
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if __name__ == "__main__":
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import xml.sax
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p = create_parser()
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p.setContentHandler(xml.sax.XMLGenerator())
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p.setErrorHandler(xml.sax.ErrorHandler())
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p.parse("../../../hamlet.xml")
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