test_pyexpat.py 文件源码

def test_use_foreign_dtd(self):
        """
        If UseForeignDTD is passed True and a document without an external
        entity reference is parsed, ExternalEntityRefHandler is first called
        with None for the public and system ids.
        """
        handler_call_args = []
        def resolve_entity(context, base, system_id, public_id):
            handler_call_args.append((public_id, system_id))
            return 1

        parser = expat.ParserCreate()
        parser.UseForeignDTD(True)
        parser.SetParamEntityParsing(expat.XML_PARAM_ENTITY_PARSING_ALWAYS)
        parser.ExternalEntityRefHandler = resolve_entity
        parser.Parse("<?xml version='1.0'?><element/>")
        self.assertEqual(handler_call_args, [(None, None)])