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/*
* librest - RESTful web services access
* Copyright (c) 2008, 2009, Intel Corporation.
*
* Authors: Rob Bradford <rob@linux.intel.com>
* Ross Burton <ross@linux.intel.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU Lesser General Public License,
* version 2.1, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <string.h>
#include <libxml/xmlreader.h>
#include "rest-private.h"
#include "rest-xml-parser.h"
G_DEFINE_TYPE (RestXmlParser, rest_xml_parser, G_TYPE_OBJECT)
#define G(x) (gchar *)x
static void
rest_xml_parser_class_init (RestXmlParserClass *klass)
{
}
static void
rest_xml_parser_init (RestXmlParser *self)
{
}
static void
rest_xml_parser_xml_reader_error (void *arg,
const char *msg,
xmlParserSeverities severity,
xmlTextReaderLocatorPtr locator)
{
REST_DEBUG(XML_PARSER, "%s", msg);
}
/**
* rest_xml_parser_new:
*
* Create a new #RestXmlParser, for parsing XML documents.
*
* Returns: a new #RestXmlParser.
*/
RestXmlParser *
rest_xml_parser_new (void)
{
return g_object_new (REST_TYPE_XML_PARSER, NULL);
}
/**
* rest_xml_parser_parse_from_data:
* @parser: a #RestXmlParser
* @data: the XML content to parse
* @len: the length of @data, or -1 if @data is a nul-terminated string
*
* Parse the XML in @data, and return a new #RestXmlNode. If @data is invalid
* XML, %NULL is returned.
*
* Returns: a new #RestXmlNode, or %NULL if the XML was invalid.
*/
RestXmlNode *
rest_xml_parser_parse_from_data (RestXmlParser *parser,
const gchar *data,
goffset len)
{
xmlTextReaderPtr reader;
RestXmlNode *cur_node = NULL;
RestXmlNode *new_node = NULL;
RestXmlNode *tmp_node = NULL;
RestXmlNode *root_node = NULL;
RestXmlNode *node = NULL;
const gchar *name = NULL;
const gchar *attr_name = NULL;
const gchar *attr_value = NULL;
GQueue nodes = G_QUEUE_INIT;
g_return_val_if_fail (REST_IS_XML_PARSER (parser), NULL);
g_return_val_if_fail (data != NULL, NULL);
if (len == -1)
len = strlen (data);
_rest_setup_debugging ();
reader = xmlReaderForMemory (data,
len,
NULL, /* URL? */
NULL, /* encoding */
XML_PARSE_RECOVER | XML_PARSE_NOCDATA);
if (reader == NULL) {
return NULL;
}
xmlTextReaderSetErrorHandler(reader, rest_xml_parser_xml_reader_error, NULL);
while (xmlTextReaderRead (reader) == 1)
{
switch (xmlTextReaderNodeType (reader))
{
case XML_READER_TYPE_ELEMENT:
/* Lookup the "name" for the tag */
name = G(xmlTextReaderConstName (reader));
REST_DEBUG (XML_PARSER, "Opening tag: %s", name);
/* Create our new node for this tag */
new_node = _rest_xml_node_new ();
new_node->name = G (g_intern_string (name));
if (!root_node)
{
root_node = new_node;
}
/*
* Check if we are not the root node because we need to update it's
* children set to include the new node.
*/
if (cur_node)
{
tmp_node = g_hash_table_lookup (cur_node->children, new_node->name);
if (tmp_node)
{
REST_DEBUG (XML_PARSER, "Existing node found for this name. "
"Prepending to the list.");
g_hash_table_insert (cur_node->children,
G(tmp_node->name),
_rest_xml_node_prepend (tmp_node, new_node));
} else {
REST_DEBUG (XML_PARSER, "Unseen name. Adding to the children table.");
g_hash_table_insert (cur_node->children,
G(new_node->name),
new_node);
}
}
/*
* Check for empty element. If empty we needn't worry about children
* or text and thus we don't need to update the stack or state
*/
if (xmlTextReaderIsEmptyElement (reader))
{
REST_DEBUG (XML_PARSER, "We have an empty element. No children or text.");
} else {
REST_DEBUG (XML_PARSER, "Non-empty element found."
" Pushing to stack and updating current state.");
g_queue_push_head (&nodes, new_node);
cur_node = new_node;
}
/*
* Check if we have attributes. These get stored in the node's attrs
* hash table.
*/
if (xmlTextReaderHasAttributes (reader))
{
xmlTextReaderMoveToFirstAttribute (reader);
do {
attr_name = G(xmlTextReaderConstLocalName (reader));
attr_value = G(xmlTextReaderConstValue (reader));
g_hash_table_insert (new_node->attrs,
g_strdup (attr_name),
g_strdup (attr_value));
REST_DEBUG (XML_PARSER, "Attribute found: %s = %s",
attr_name,
attr_value);
} while (xmlTextReaderMoveToNextAttribute (reader) == 1);
}
break;
case XML_READER_TYPE_END_ELEMENT:
REST_DEBUG (XML_PARSER, "Closing tag: %s",
xmlTextReaderConstLocalName (reader));
REST_DEBUG (XML_PARSER, "Popping from stack and updating state.");
/* For those children that have siblings, reverse the siblings */
node = (RestXmlNode *)g_queue_pop_head (&nodes);
_rest_xml_node_reverse_children_siblings (node);
/* Update the current node to the new top of the stack */
cur_node = (RestXmlNode *)g_queue_peek_head (&nodes);
if (cur_node)
{
REST_DEBUG (XML_PARSER, "Head is now %s", cur_node->name);
} else {
REST_DEBUG (XML_PARSER, "At the top level");
}
break;
case XML_READER_TYPE_TEXT:
if (cur_node)
{
cur_node->content = g_strdup (G(xmlTextReaderConstValue (reader)));
REST_DEBUG (XML_PARSER, "Text content found: %s",
cur_node->content);
} else {
g_warning ("[XML_PARSER] " G_STRLOC ": "
"Text content ignored at top level.");
}
break;
default:
REST_DEBUG (XML_PARSER, "Found unknown content with type: 0x%x",
xmlTextReaderNodeType (reader));
break;
}
}
xmlTextReaderClose (reader);
xmlFreeTextReader (reader);
return root_node;
}
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