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#include <libxml/xmlreader.h>
#include "rest-xml-parser.h"
G_DEFINE_TYPE (RestXmlParser, rest_xml_parser, G_TYPE_OBJECT)
#define GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE ((o), REST_TYPE_XML_PARSER, RestXmlParserPrivate))
typedef struct _RestXmlParserPrivate RestXmlParserPrivate;
struct _RestXmlParserPrivate {
xmlTextReaderPtr reader;
};
static void
rest_xml_parser_get_property (GObject *object, guint property_id,
GValue *value, GParamSpec *pspec)
{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
rest_xml_parser_set_property (GObject *object, guint property_id,
const GValue *value, GParamSpec *pspec)
{
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}
}
static void
rest_xml_parser_dispose (GObject *object)
{
if (G_OBJECT_CLASS (rest_xml_parser_parent_class)->dispose)
G_OBJECT_CLASS (rest_xml_parser_parent_class)->dispose (object);
}
static void
rest_xml_parser_finalize (GObject *object)
{
RestXmlParserPrivate *priv = GET_PRIVATE (object);
xmlFreeTextReader (priv->reader);
if (G_OBJECT_CLASS (rest_xml_parser_parent_class)->finalize)
G_OBJECT_CLASS (rest_xml_parser_parent_class)->finalize (object);
}
static void
rest_xml_parser_class_init (RestXmlParserClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (RestXmlParserPrivate));
object_class->get_property = rest_xml_parser_get_property;
object_class->set_property = rest_xml_parser_set_property;
object_class->dispose = rest_xml_parser_dispose;
object_class->finalize = rest_xml_parser_finalize;
}
static void
rest_xml_parser_init (RestXmlParser *self)
{
}
static RestXmlNode *
rest_xml_node_prepend (RestXmlNode *cur_node, RestXmlNode *new_node)
{
g_assert (new_node->next == NULL);
new_node->next = cur_node;
return new_node;
}
RestXmlNode *
rest_xml_node_new ()
{
RestXmlNode *node;
node = g_slice_new0 (RestXmlNode);
node->children = g_hash_table_new (g_str_hash, g_str_equal);
node->attrs = g_hash_table_new_full (g_str_hash,
g_str_equal,
g_free,
g_free);
return node;
}
void
rest_xml_node_free (RestXmlNode *node)
{
GList *l;
for (l = g_hash_table_get_values (node->children); l; l = l->next)
{
rest_xml_node_free ((RestXmlNode *)l->data);
}
g_hash_table_unref (node->children);
g_hash_table_unref (node->attrs);
g_free (node->name);
g_free (node->content);
g_slice_free (RestXmlNode, node);
}
RestXmlParser *
rest_xml_parser_new (void)
{
return g_object_new (REST_TYPE_XML_PARSER, NULL);
}
RestXmlNode *
rest_xml_parser_parse_from_data (RestXmlParser *parser,
const gchar *data,
gssize len)
{
RestXmlParserPrivate *priv = GET_PRIVATE (parser);
RestXmlNode *cur_node = NULL;
RestXmlNode *new_node = NULL;
RestXmlNode *tmp_node = NULL;
RestXmlNode *root_node = NULL;
const gchar *name = NULL;
const gchar *attr_name = NULL;
const gchar *attr_value = NULL;
GQueue *nodes = NULL;
gint res = 0;
priv->reader = xmlReaderForMemory (data,
len,
NULL, /* URL? */
NULL, /* encoding */
XML_PARSE_RECOVER | XML_PARSE_NOCDATA);
nodes = g_queue_new ();
while ((res = xmlTextReaderRead (priv->reader)) == 1)
{
switch (xmlTextReaderNodeType (priv->reader))
{
case XML_READER_TYPE_ELEMENT:
/* Lookup the "name" for the tag */
name = xmlTextReaderConstLocalName (priv->reader);
g_debug (G_STRLOC ": Opening tag: %s", name);
/* Create our new node for this tag */
new_node = rest_xml_node_new ();
new_node->name = g_strdup (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, name);
if (tmp_node)
{
g_debug (G_STRLOC ": Existing node found for this name. "
"Prepending to the list.");
g_hash_table_insert (cur_node->children,
(gchar *)new_node->name,
rest_xml_node_prepend (tmp_node, new_node));
} else {
g_debug (G_STRLOC ": Unseen name. Adding to the children table.");
g_hash_table_insert (cur_node->children,
(gchar *)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 (priv->reader))
{
g_debug (G_STRLOC ": We have an empty element. No children or text.");
} else {
g_debug (G_STRLOC ": 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 (priv->reader))
{
xmlTextReaderMoveToFirstAttribute (priv->reader);
do {
attr_name = xmlTextReaderConstLocalName (priv->reader);
attr_value = xmlTextReaderConstValue (priv->reader);
g_hash_table_insert (new_node->attrs,
g_strdup (attr_name),
g_strdup (attr_value));
g_debug (G_STRLOC ": Attribute found: %s = %s",
attr_name,
attr_value);
} while ((res = xmlTextReaderMoveToNextAttribute (priv->reader)) == 1);
}
break;
case XML_READER_TYPE_END_ELEMENT:
g_debug (G_STRLOC ": Closing tag: %s",
xmlTextReaderConstLocalName (priv->reader));
g_debug (G_STRLOC ": Popping from stack and updating state.");
g_queue_pop_head (nodes);
cur_node = (RestXmlNode *)g_queue_peek_head (nodes);
if (cur_node)
{
g_debug (G_STRLOC ": Head is now %s", cur_node->name);
} else {
g_debug (G_STRLOC ": At the top level");
}
break;
case XML_READER_TYPE_TEXT:
cur_node->content = g_strdup (xmlTextReaderConstValue (priv->reader));
g_debug (G_STRLOC ": Text content found: %s",
cur_node->content);
default:
g_debug (G_STRLOC ": Found unknown content with type: 0x%x",
xmlTextReaderNodeType (priv->reader));
break;
}
}
xmlTextReaderClose (priv->reader);
return root_node;
}
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