Synchronize with 1.13 of PyXML:

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.

Lib/xml/sax/expatreader.py

@@ -6,6 +6,13 @@ pyexpat.__version__ == '2.22'.
 version = "0.20"
 
 from xml.sax._exceptions import *
+
+# xml.parsers.expat does not raise ImportError in Jython
+import sys
+if sys.platform[ : 4] == "java":
+    raise SAXReaderNotAvailable("expat not available in Java", None)
+del sys
+
 try:
     from xml.parsers import expat
 except ImportError:
@@ -46,6 +53,13 @@ class ExpatParser(xmlreader.IncrementalParser, xmlreader.Locator):
         if source.getSystemId() != None:
             self._parser.SetBase(source.getSystemId())
 
+    # Redefined setContentHandle to allow changing handlers during parsing
+
+    def setContentHandler(self, handler):
+        xmlreader.IncrementalParser.setContentHandler(self, handler)
+        if self._parsing:
+            self._reset_cont_handler()
+
     def getFeature(self, name):
         if name == handler.feature_namespaces:
             return self._namespaces
@@ -68,6 +82,8 @@ class ExpatParser(xmlreader.IncrementalParser, xmlreader.Locator):
     def setProperty(self, name, value):
         if name == handler.property_lexical_handler:
             self._lex_handler_prop = value
+            if self._parsing:
+                self._reset_lex_handler_prop()
         else:
             raise SAXNotRecognizedException("Property '%s' not recognized" % name)
 
@@ -101,6 +117,16 @@ class ExpatParser(xmlreader.IncrementalParser, xmlreader.Locator):
         # break cycle created by expat handlers pointing to our methods
         self._parser = None
 
+    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):
+        self._parser.CommentHandler = self._lex_handler_prop.comment
+        self._parser.StartCdataSectionHandler = self._lex_handler_prop.startCDATA
+        self._parser.EndCdataSectionHandler = self._lex_handler_prop.endCDATA
+
     def reset(self):
         if self._namespaces:
             self._parser = expat.ParserCreate(None, " ")
@@ -111,9 +137,7 @@ class ExpatParser(xmlreader.IncrementalParser, xmlreader.Locator):
             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._reset_cont_handler()
         self._parser.UnparsedEntityDeclHandler = self.unparsed_entity_decl
         self._parser.NotationDeclHandler = self.notation_decl
         self._parser.StartNamespaceDeclHandler = self.start_namespace_decl
@@ -121,9 +145,7 @@ class ExpatParser(xmlreader.IncrementalParser, xmlreader.Locator):
 
         self._decl_handler_prop = None
         if self._lex_handler_prop:
-            self._parser.CommentHandler = self._lex_handler_prop.comment
-            self._parser.StartCdataSectionHandler = self._lex_handler_prop.startCDATA
-            self._parser.EndCdataSectionHandler = self._lex_handler_prop.endCDATA
+            self._reset_lex_handler_prop()
 #         self._parser.DefaultHandler =
 #         self._parser.DefaultHandlerExpand =
 #         self._parser.NotStandaloneHandler =