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Add xml_is_well_formed, xml_is_well_formed_document, xml_is_well_formed_content

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functions to the core XML code.  Per discussion, the former depends on
XMLOPTION while the others do not.  These supersede a version previously
offered by contrib/xml2.

Mike Fowler, reviewed by Pavel Stehule
This commit is contained in:
Tom Lane
2010-08-13 18:36:26 +00:00
parent 2a7349f030
commit a0b7b717a4
11 changed files with 343 additions and 18 deletions
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72
src/backend/utils/adt/xml.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.100 2010/08/08 19:15:27 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.101 2010/08/13 18:36:24 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -3565,3 +3565,73 @@ xpath_exists(PG_FUNCTION_ARGS)
return 0;
#endif
}
/*
* Functions for checking well-formed-ness
*/
#ifdef USE_LIBXML
static bool
wellformed_xml(text *data, XmlOptionType xmloption_arg)
{
bool result;
xmlDocPtr doc = NULL;
/* We want to catch any exceptions and return false */
PG_TRY();
{
doc = xml_parse(data, xmloption_arg, true, GetDatabaseEncoding());
result = true;
}
PG_CATCH();
{
FlushErrorState();
result = false;
}
PG_END_TRY();
if (doc)
xmlFreeDoc(doc);
return result;
}
#endif
Datum
xml_is_well_formed(PG_FUNCTION_ARGS)
{
#ifdef USE_LIBXML
text *data = PG_GETARG_TEXT_P(0);
PG_RETURN_BOOL(wellformed_xml(data, xmloption));
#else
NO_XML_SUPPORT();
return 0;
#endif /* not USE_LIBXML */
}
Datum
xml_is_well_formed_document(PG_FUNCTION_ARGS)
{
#ifdef USE_LIBXML
text *data = PG_GETARG_TEXT_P(0);
PG_RETURN_BOOL(wellformed_xml(data, XMLOPTION_DOCUMENT));
#else
NO_XML_SUPPORT();
return 0;
#endif /* not USE_LIBXML */
}
Datum
xml_is_well_formed_content(PG_FUNCTION_ARGS)
{
#ifdef USE_LIBXML
text *data = PG_GETARG_TEXT_P(0);
PG_RETURN_BOOL(wellformed_xml(data, XMLOPTION_CONTENT));
#else
NO_XML_SUPPORT();
return 0;
#endif /* not USE_LIBXML */
}