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"""
SAX driver for the Pyexpat C module. This driver works with
pyexpat.__version__ == '1.5'.
"""
# Todo on driver:
# - make it support external entities (wait for pyexpat.c)
# - enable configuration between reset() and feed() calls
# - support lexical events?
# - proper inputsource handling
# - properties and features
# Todo on pyexpat.c:
# - support XML_ExternalEntityParserCreate
# - exceptions in callouts from pyexpat to python code lose position info
version = "0.20"
from xml.sax._exceptions import *
from xml.parsers import expat
from xml.sax import xmlreader, saxutils
AttributesImpl = xmlreader.AttributesImpl
AttributesNSImpl = xmlreader.AttributesNSImpl
# --- ExpatParser
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 = None
self._parser = None
self._namespaces = namespaceHandling
self._parsing = 0
# XMLReader methods
def parse(self, source):
"Parse an XML document from a URL."
source = saxutils.prepare_input_source(source)
self._source = source
self.reset()
self._cont_handler.setDocumentLocator(self)
try:
xmlreader.IncrementalParser.parse(self, source)
except expat.error:
error_code = self._parser.ErrorCode
raise SAXParseException(expat.ErrorString(error_code), None, self)
self._cont_handler.endDocument()
def prepareParser(self, source):
if source.getSystemId() != None:
self._parser.SetBase(source.getSystemId())
def getFeature(self, name):
if name == feature_namespaces:
return self._namespaces
raise SAXNotRecognizedException("Feature '%s' not recognized" % name)
def setFeature(self, name, state):
if self._parsing:
raise SAXNotSupportedException("Cannot set features while parsing")
if name == feature_namespaces:
self._namespaces = state
else:
raise SAXNotRecognizedException("Feature '%s' not recognized" %
name)
def getProperty(self, name):
raise SAXNotRecognizedException("Property '%s' not recognized" % name)
def setProperty(self, name, value):
raise SAXNotRecognizedException("Property '%s' not recognized" % name)
# IncrementalParser methods
def feed(self, data):
if not self._parsing:
self._parsing = 1
self.reset()
self._cont_handler.startDocument()
if not self._parser.Parse(data, 0):
msg = pyexpat.ErrorString(self._parser.ErrorCode)
raise SAXParseException(msg, None, self)
def close(self):
if self._parsing:
self._cont_handler.endDocument()
self._parsing = 0
self._parser.Parse("", 1)
def reset(self):
if self._namespaces:
self._parser = expat.ParserCreate(None, " ")
self._parser.StartElementHandler = self.start_element_ns
self._parser.EndElementHandler = self.end_element_ns
else:
self._parser = expat.ParserCreate()
self._parser.StartElementHandler = self.start_element
self._parser.EndElementHandler = self.end_element
self._parser.ProcessingInstructionHandler = \
self._cont_handler.processingInstruction
self._parser.CharacterDataHandler = self._cont_handler.characters
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._parser.CommentHandler =
# self._parser.StartCdataSectionHandler =
# self._parser.EndCdataSectionHandler =
# self._parser.DefaultHandler =
# self._parser.DefaultHandlerExpand =
# self._parser.NotStandaloneHandler =
self._parser.ExternalEntityRefHandler = self.external_entity_ref
# Locator methods
def getColumnNumber(self):
return self._parser.ErrorColumnNumber
def getLineNumber(self):
return self._parser.ErrorLineNumber
def getPublicId(self):
return self._source.getPublicId()
def getSystemId(self):
return self._parser.GetBase()
# event handlers
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):
pair = name.split()
if len(pair) == 1:
pair = (None, name)
newattrs = {}
for (aname, value) in attrs.items():
apair = aname.split()
if len(apair) == 1:
apair = (None, aname)
else:
apair = tuple(apair)
newattrs[apair] = value
self._cont_handler.startElementNS(pair, None,
AttributesNSImpl(newattrs, {}))
def end_element_ns(self, name):
pair = name.split()
if len(pair) == 1:
pair = (None, 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 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):
raise NotImplementedError()
source = self._ent_handler.resolveEntity(pubid, sysid)
source = saxutils.prepare_input_source(source)
# FIXME: create new parser, stack self._source and self._parser
# FIXME: reuse code from self.parse(...)
return 1
# ---
def create_parser(*args, **kwargs):
return apply(ExpatParser, args, kwargs)
# ---
if __name__ == "__main__":
import xml.sax
p = create_parser()
p.setContentHandler(xml.sax.XMLGenerator())
p.setErrorHandler(xml.sax.ErrorHandler())
p.parse("../../../hamlet.xml")
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