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/**
 * @file xmlnode.h XML DOM functions
 * @ingroup core
 */

/* purple
 *
 * Purple is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
 */
#ifndef _PURPLE_XMLNODE_H_
#define _PURPLE_XMLNODE_H_

#include <glib.h>

#ifdef __cplusplus
extern "C" {
#endif

/**
 * The valid types for an xmlnode
 */
typedef enum _XMLNodeType
{
	XMLNODE_TYPE_TAG,		/**< Just a tag */
	XMLNODE_TYPE_ATTRIB,		/**< Has attributes */
	XMLNODE_TYPE_DATA		/**< Has data */
} XMLNodeType;

/**
 * An xmlnode.
 */
typedef struct _xmlnode xmlnode;
struct _xmlnode
{
	char *name;			/**< The name of the node. */
	char *xmlns;		/**< The namespace of the node */
	XMLNodeType type;		/**< The type of the node. */
	char *data;			/**< The data for the node. */
	size_t data_sz;			/**< The size of the data. */
	xmlnode *parent;            /**< The parent node or @c NULL.*/
	xmlnode *child;             /**< The child node or @c NULL.*/
	xmlnode *lastchild;         /**< The last child node or @c NULL.*/
	xmlnode *next;              /**< The next node or @c NULL. */
	char *prefix;               /**< The namespace prefix if any. */
	GHashTable *namespace_map;  /**< The namespace map. */
};

/**
 * Creates a new xmlnode.
 *
 * @param name The name of the node.
 *
 * @return The new node.
 */
xmlnode *xmlnode_new(const char *name);

/**
 * Creates a new xmlnode child.
 *
 * @param parent The parent node.
 * @param name   The name of the child node.
 *
 * @return The new child node.
 */
xmlnode *xmlnode_new_child(xmlnode *parent, const char *name);

/**
 * Inserts a node into a node as a child.
 *
 * @param parent The parent node to insert child into.
 * @param child  The child node to insert into parent.
 */
void xmlnode_insert_child(xmlnode *parent, xmlnode *child);

/**
 * Gets a child node named name.
 *
 * @param parent The parent node.
 * @param name   The child's name.
 *
 * @return The child or NULL.
 */
xmlnode *xmlnode_get_child(const xmlnode *parent, const char *name);

/**
 * Gets a child node named name in a namespace.
 *
 * @param parent The parent node.
 * @param name   The child's name.
 * @param xmlns  The namespace.
 *
 * @return The child or NULL.
 */
xmlnode *xmlnode_get_child_with_namespace(const xmlnode *parent, const char *name, const char *xmlns);

/**
 * Gets the next node with the same name as node.
 *
 * @param node The node of a twin to find.
 *
 * @return The twin of node or NULL.
 */
xmlnode *xmlnode_get_next_twin(xmlnode *node);

/**
 * Inserts data into a node.
 *
 * @param node   The node to insert data into.
 * @param data   The data to insert.
 * @param size   The size of the data to insert.  If data is
 *               null-terminated you can pass in -1.
 */
void xmlnode_insert_data(xmlnode *node, const char *data, gssize size);

/**
 * Gets (escaped) data from a node.
 *
 * @param node The node to get data from.
 *
 * @return The data from the node or NULL. This data is in raw escaped format.
 *         You must g_free this string when finished using it.
 */
char *xmlnode_get_data(const xmlnode *node);

/**
 * Gets unescaped data from a node.
 *
 * @param node The node to get data from.
 *
 * @return The data from the node, in unescaped form.   You must g_free
 *         this string when finished using it.
 */
char *xmlnode_get_data_unescaped(const xmlnode *node);

/**
 * Sets an attribute for a node.
 *
 * @param node  The node to set an attribute for.
 * @param attr  The name of the attribute.
 * @param value The value of the attribute.
 */
void xmlnode_set_attrib(xmlnode *node, const char *attr, const char *value);

#if !(defined PURPLE_DISABLE_DEPRECATED) || (defined _PURPLE_XMLNODE_C_)
/**
 * Sets a prefixed attribute for a node
 *
 * @param node   The node to set an attribute for.
 * @param attr   The name of the attribute to set
 * @param prefix The prefix of the attribute to ste
 * @param value  The value of the attribute
 *
 * @deprecated Use xmlnode_set_attrib_full instead.
 */
void xmlnode_set_attrib_with_prefix(xmlnode *node, const char *attr, const char *prefix, const char *value);

/**
 * Sets a namespaced attribute for a node
 *
 * @param node  The node to set an attribute for.
 * @param attr  The name of the attribute to set
 * @param xmlns The namespace of the attribute to ste
 * @param value The value of the attribute
 *
 * @deprecated Use xmlnode_set_attrib_full instead.
 */
void xmlnode_set_attrib_with_namespace(xmlnode *node, const char *attr, const char *xmlns, const char *value);
#endif /* PURPLE_DISABLE_DEPRECATED */

/**
 * Sets a namespaced attribute for a node
 *
 * @param node   The node to set an attribute for.
 * @param attr   The name of the attribute to set
 * @param xmlns  The namespace of the attribute to ste
 * @param prefix The prefix of the attribute to ste
 * @param value  The value of the attribute
 *
 * @since 2.6.0
 */
void xmlnode_set_attrib_full(xmlnode *node, const char *attr, const char *xmlns,
	const char *prefix, const char *value);

/**
 * Gets an attribute from a node.
 *
 * @param node The node to get an attribute from.
 * @param attr The attribute to get.
 *
 * @return The value of the attribute.
 */
const char *xmlnode_get_attrib(const xmlnode *node, const char *attr);

/**
 * Gets a namespaced attribute from a node
 *
 * @param node  The node to get an attribute from.
 * @param attr  The attribute to get
 * @param xmlns The namespace of the attribute to get
 *
 * @return The value of the attribute/
 */
const char *xmlnode_get_attrib_with_namespace(const xmlnode *node, const char *attr, const char *xmlns);

/**
 * Removes an attribute from a node.
 *
 * @param node The node to remove an attribute from.
 * @param attr The attribute to remove.
 */
void xmlnode_remove_attrib(xmlnode *node, const char *attr);

/**
 * Removes a namespaced attribute from a node
 *
 * @param node  The node to remove an attribute from
 * @param attr  The attribute to remove
 * @param xmlns The namespace of the attribute to remove
 */
void xmlnode_remove_attrib_with_namespace(xmlnode *node, const char *attr, const char *xmlns);

/**
 * Sets the namespace of a node
 *
 * @param node The node to qualify
 * @param xmlns The namespace of the node
 */
void xmlnode_set_namespace(xmlnode *node, const char *xmlns);

/**
 * Returns the namespace of a node
 *
 * @param node The node to get the namepsace from
 * @return The namespace of this node
 */
const char *xmlnode_get_namespace(xmlnode *node);

/**
 * Sets the prefix of a node
 *
 * @param node   The node to qualify
 * @param prefix The prefix of the node
 */
void xmlnode_set_prefix(xmlnode *node, const char *prefix);

/**
 * Returns the prefix of a node
 *
 * @param node The node to get the prefix from
 * @return The prefix of this node
 */
const char *xmlnode_get_prefix(const xmlnode *node);

/**
 * Gets the parent node.
 *
 * @param child The child node.
 *
 * @return The parent or NULL.
 *
 * @since 2.6.0
 */
xmlnode *xmlnode_get_parent(const xmlnode *child);

/**
 * Returns the node in a string of xml.
 *
 * @param node The starting node to output.
 * @param len  Address for the size of the string.
 *
 * @return The node represented as a string.  You must
 *         g_free this string when finished using it.
 */
char *xmlnode_to_str(const xmlnode *node, int *len);

/**
 * Returns the node in a string of human readable xml.
 *
 * @param node The starting node to output.
 * @param len  Address for the size of the string.
 *
 * @return The node as human readable string including
 *         tab and new line characters.  You must
 *         g_free this string when finished using it.
 */
char *xmlnode_to_formatted_str(const xmlnode *node, int *len);

/**
 * Creates a node from a string of XML.  Calling this on the
 * root node of an XML document will parse the entire document
 * into a tree of nodes, and return the xmlnode of the root.
 *
 * @param str  The string of xml.
 * @param size The size of the string, or -1 if @a str is
 *             NUL-terminated.
 *
 * @return The new node.
 */
xmlnode *xmlnode_from_str(const char *str, gssize size);

/**
 * Creates a new node from the source node.
 *
 * @param src The node to copy.
 *
 * @return A new copy of the src node.
 */
xmlnode *xmlnode_copy(const xmlnode *src);

/**
 * Frees a node and all of its children.
 *
 * @param node The node to free.
 */
void xmlnode_free(xmlnode *node);

/**
 * Creates a node from a XML File.  Calling this on the
 * root node of an XML document will parse the entire document
 * into a tree of nodes, and return the xmlnode of the root.
 *
 * @param dir  The directory where the file is located
 * @param filename  The filename
 * @param description  A description of the file being parsed. Displayed to
 * 			the user if the file cannot be read.
 * @param process  The subsystem that is calling xmlnode_from_file. Used as
 * 			the category for debugging.
 *
 * @return The new node or NULL if an error occurred.
 *
 * @since 2.6.0
 */
xmlnode *xmlnode_from_file(const char *dir, const char *filename,
			   const char *description, const char *process);

#ifdef __cplusplus
}
#endif

#endif /* _PURPLE_XMLNODE_H_ */