applied patch from Stephane Bidoul for structured error handling from

* python/libxml2-python-api.xml python/libxml_wrap.h python/types.c
  python/tests/Makefile.am python/tests/tstLastError.py: applied
  patch from Stephane Bidoul for structured error handling from
  python, and the associated test
Daniel

python/tests/tstLastError.py

@@ -0,0 +1,72 @@
+#!/usr/bin/python -u
+import sys, unittest
+
+import libxml2
+
+class TestCase(unittest.TestCase):
+
+    def setUp(self):
+        libxml2.debugMemory(1)
+
+    def tearDown(self):
+        libxml2.cleanupParser()
+        if libxml2.debugMemory(1) != 0:
+            libxml2.dumpMemory() 
+            self.fail("Memory leak %d bytes" % (libxml2.debugMemory(1),))
+
+    def failUnlessXmlError(self,f,args,exc,domain,code,message,level,file,line):
+        """Run function f, with arguments args and expect an exception exc;
+        when the exception is raised, check the libxml2.lastError for
+        expected values."""
+        # disable the default error handler
+        libxml2.registerErrorHandler(None,None)
+        try:
+            f(*args)
+        except exc:
+            e = libxml2.lastError()
+            if e is None:
+                self.fail("lastError not set")
+            if 0:
+                print "domain = ",e.domain()
+                print "code = ",e.code()
+                print "message =",repr(e.message())
+                print "level =",e.level()
+                print "file =",e.file()
+                print "line =",e.line()
+                print
+            self.failUnlessEqual(domain,e.domain())
+            self.failUnlessEqual(code,e.code())
+            self.failUnlessEqual(message,e.message())
+            self.failUnlessEqual(level,e.level())
+            self.failUnlessEqual(file,e.file())
+            self.failUnlessEqual(line,e.line())
+        else:
+            self.fail("exception %s should have been raised" % exc)
+
+    def test1(self):
+        """Test readFile with a file that does not exist"""
+        self.failUnlessXmlError(libxml2.readFile,
+                        ("dummy.xml",None,0),
+                        libxml2.treeError,
+                        domain=8, # XML_FROM_IO
+                        code=1549, # XML_IO_LOAD_ERROR
+                        message='failed to load external entity "dummy.xml"\n',
+                        level=1, # XML_ERR_WARNING
+                        file=None,
+                        line=0)
+
+    def test2(self):
+        """Test a well-formedness error: we get the last error only"""
+        s = "<x>\n<a>\n</x>"
+        self.failUnlessXmlError(libxml2.readMemory,
+                        (s,len(s),"dummy.xml",None,0),
+                        libxml2.treeError,
+                        domain=1, # XML_FROM_PARSER
+                        code=77, # XML_ERR_TAG_NOT_FINISHED
+                        message='Premature end of data in tag x line 1\n',
+                        level=3, # XML_ERR_FATAL
+                        file='dummy.xml',
+                        line=3)
+
+if __name__ == "__main__":
+    unittest.main()