SAX driver for the pyexpat C module. This driver works with
pyexpat.__version__ == '2.22'.
from xml.sax._exceptions import *
from xml.sax.handler import feature_validation, feature_namespaces
from xml.sax.handler import feature_namespace_prefixes
from xml.sax.handler import feature_external_ges, feature_external_pes
from xml.sax.handler import feature_string_interning
from xml.sax.handler import property_xml_string, property_interning_dict
# xml.parsers.expat does not raise ImportError in Jython
if sys.platform[:4] == "java":
raise SAXReaderNotAvailable("expat not available in Java", None)
from xml.parsers import expat
raise SAXReaderNotAvailable("expat not supported", None)
if not hasattr(expat, "ParserCreate"):
raise SAXReaderNotAvailable("expat not supported", None)
from xml.sax import xmlreader, saxutils, handler
AttributesImpl = xmlreader.AttributesImpl
AttributesNSImpl = xmlreader.AttributesNSImpl
# If we're using a sufficiently recent version of Python, we can use
# weak references to avoid cycles between the parser and content
# handler, otherwise we'll just have to pretend.
class ExpatLocator(xmlreader.Locator):
"""Locator for use with the ExpatParser class.
This uses a weak reference to the parser object to avoid creating
a circular reference between the parser and the content handler.
def __init__(self, parser):
self._ref = _mkproxy(parser)
def getColumnNumber(self):
if parser._parser is None:
return parser._parser.ErrorColumnNumber
if parser._parser is None:
return parser._parser.ErrorLineNumber
return parser._source.getPublicId()
return parser._source.getSystemId()
class ExpatParser(xmlreader.IncrementalParser, xmlreader.Locator):
"""SAX driver for the pyexpat C module."""
def __init__(self, namespaceHandling=0, bufsize=2**16-20):
xmlreader.IncrementalParser.__init__(self, bufsize)
self._source = xmlreader.InputSource()
self._namespaces = namespaceHandling
self._lex_handler_prop = None
"Parse an XML document from a URL or an InputSource."
source = saxutils.prepare_input_source(source)
self._cont_handler.setDocumentLocator(ExpatLocator(self))
xmlreader.IncrementalParser.parse(self, source)
# bpo-30264: Close the source on error to not leak resources:
# xml.sax.parse() doesn't give access to the underlying parser
def prepareParser(self, source):
if source.getSystemId() is not None:
base = source.getSystemId()
if isinstance(base, unicode):
base = base.encode('utf-8')
self._parser.SetBase(base)
# Redefined setContentHandler to allow changing handlers during parsing
def setContentHandler(self, handler):
xmlreader.IncrementalParser.setContentHandler(self, handler)
self._reset_cont_handler()
def getFeature(self, name):
if name == feature_namespaces:
elif name == feature_string_interning:
return self._interning is not None
elif name in (feature_validation, feature_external_pes,
feature_namespace_prefixes):
elif name == feature_external_ges:
return self._external_ges
raise SAXNotRecognizedException("Feature '%s' not recognized" % name)
def setFeature(self, name, state):
raise SAXNotSupportedException("Cannot set features while parsing")
if name == feature_namespaces:
elif name == feature_external_ges:
self._external_ges = state
elif name == feature_string_interning:
if self._interning is None:
elif name == feature_validation:
raise SAXNotSupportedException(
"expat does not support validation")
elif name == feature_external_pes:
raise SAXNotSupportedException(
"expat does not read external parameter entities")
elif name == feature_namespace_prefixes:
raise SAXNotSupportedException(
"expat does not report namespace prefixes")
raise SAXNotRecognizedException(
"Feature '%s' not recognized" % name)
def getProperty(self, name):
if name == handler.property_lexical_handler:
return self._lex_handler_prop
elif name == property_interning_dict:
elif name == property_xml_string:
if hasattr(self._parser, "GetInputContext"):
return self._parser.GetInputContext()
raise SAXNotRecognizedException(
"This version of expat does not support getting"
raise SAXNotSupportedException(
"XML string cannot be returned when not parsing")
raise SAXNotRecognizedException("Property '%s' not recognized" % name)
def setProperty(self, name, value):
if name == handler.property_lexical_handler:
self._lex_handler_prop = value
self._reset_lex_handler_prop()
elif name == property_interning_dict:
elif name == property_xml_string:
raise SAXNotSupportedException("Property '%s' cannot be set" %
raise SAXNotRecognizedException("Property '%s' not recognized" %
# IncrementalParser methods
def feed(self, data, isFinal = 0):
self._cont_handler.startDocument()
# The isFinal parameter is internal to the expat reader.
# If it is set to true, expat will check validity of the entire
# document. When feeding chunks, they are not normally final -
# except when invoked from close.
self._parser.Parse(data, isFinal)
exc = SAXParseException(expat.ErrorString(e.code), e, self)
# FIXME: when to invoke error()?
self._err_handler.fatalError(exc)
file = source.getCharacterStream()
file = source.getByteStream()
if (self._entity_stack or self._parser is None or
isinstance(self._parser, _ClosedParser)):
# If we are completing an external entity, do nothing here
self.feed("", isFinal = 1)
self._cont_handler.endDocument()
# break cycle created by expat handlers pointing to our methods
if self._parser is not None:
# Keep ErrorColumnNumber and ErrorLineNumber after closing.
parser.ErrorColumnNumber = self._parser.ErrorColumnNumber
parser.ErrorLineNumber = self._parser.ErrorLineNumber
def _reset_cont_handler(self):
self._parser.ProcessingInstructionHandler = \
self._cont_handler.processingInstruction
self._parser.CharacterDataHandler = self._cont_handler.characters
def _reset_lex_handler_prop(self):
lex = self._lex_handler_prop
parser.CommentHandler = None
parser.StartCdataSectionHandler = None
parser.EndCdataSectionHandler = None
parser.StartDoctypeDeclHandler = None
parser.EndDoctypeDeclHandler = None
parser.CommentHandler = lex.comment
parser.StartCdataSectionHandler = lex.startCDATA
parser.EndCdataSectionHandler = lex.endCDATA
parser.StartDoctypeDeclHandler = self.start_doctype_decl
parser.EndDoctypeDeclHandler = lex.endDTD
self._parser = expat.ParserCreate(self._source.getEncoding(), " ",
self._parser.namespace_prefixes = 1
self._parser.StartElementHandler = self.start_element_ns
self._parser.EndElementHandler = self.end_element_ns
self._parser = expat.ParserCreate(self._source.getEncoding(),
intern = self._interning)
self._parser.StartElementHandler = self.start_element
self._parser.EndElementHandler = self.end_element
self._reset_cont_handler()
self._parser.UnparsedEntityDeclHandler = self.unparsed_entity_decl
self._parser.NotationDeclHandler = self.notation_decl
self._parser.StartNamespaceDeclHandler = self.start_namespace_decl
self._parser.EndNamespaceDeclHandler = self.end_namespace_decl
self._decl_handler_prop = None
if self._lex_handler_prop:
self._reset_lex_handler_prop()
# self._parser.DefaultHandler =
# self._parser.DefaultHandlerExpand =
# self._parser.NotStandaloneHandler =
self._parser.ExternalEntityRefHandler = self.external_entity_ref
self._parser.SkippedEntityHandler = self.skipped_entity_handler
# This pyexpat does not support SkippedEntity
self._parser.SetParamEntityParsing(
expat.XML_PARAM_ENTITY_PARSING_UNLESS_STANDALONE)
def getColumnNumber(self):
return self._parser.ErrorColumnNumber
return self._parser.ErrorLineNumber
return self._source.getPublicId()
return self._source.getSystemId()
def start_element(self, name, attrs):
self._cont_handler.startElement(name, AttributesImpl(attrs))
def end_element(self, name):
self._cont_handler.endElement(name)
def start_element_ns(self, name, attrs):
for (aname, value) in attrs.items():
qname = "%s:%s" % (parts[2], parts[1])
apair = parts[0], parts[1]
self._cont_handler.startElementNS(pair, None,
AttributesNSImpl(newattrs, qnames))
def end_element_ns(self, name):
self._cont_handler.endElementNS(pair, None)
# this is not used (call directly to ContentHandler)
def processing_instruction(self, target, data):
self._cont_handler.processingInstruction(target, data)
# this is not used (call directly to ContentHandler)
def character_data(self, data):
self._cont_handler.characters(data)
def start_namespace_decl(self, prefix, uri):
self._cont_handler.startPrefixMapping(prefix, uri)
def end_namespace_decl(self, prefix):
self._cont_handler.endPrefixMapping(prefix)
def start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
self._lex_handler_prop.startDTD(name, pubid, sysid)
def unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
self._dtd_handler.unparsedEntityDecl(name, pubid, sysid, notation_name)
def notation_decl(self, name, base, sysid, pubid):
self._dtd_handler.notationDecl(name, pubid, sysid)
def external_entity_ref(self, context, base, sysid, pubid):
if not self._external_ges:
source = self._ent_handler.resolveEntity(pubid, sysid)
source = saxutils.prepare_input_source(source,
self._source.getSystemId() or
self._entity_stack.append((self._parser, self._source))
self._parser = self._parser.ExternalEntityParserCreate(context)
xmlreader.IncrementalParser.parse(self, source)
return 0 # FIXME: save error info here?
(self._parser, self._source) = self._entity_stack[-1]
del self._entity_stack[-1]
def skipped_entity_handler(self, name, is_pe):
# The SAX spec requires to report skipped PEs with a '%'
self._cont_handler.skippedEntity(name)
def create_parser(*args, **kwargs):
return ExpatParser(*args, **kwargs)
if __name__ == "__main__":
p.setContentHandler(xml.sax.saxutils.XMLGenerator())
p.setErrorHandler(xml.sax.ErrorHandler())
p.parse("http://www.ibiblio.org/xml/examples/shakespeare/hamlet.xml")
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
