/* GLIB - Library of useful routines for C programming * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library 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 * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. */ /* * Modified by the GLib Team and others 1997-2000. See the AUTHORS * file for a list of people on the GLib Team. See the ChangeLog * files for a list of changes. These files are distributed with * GLib at ftp://ftp.gtk.org/pub/gtk/. */ #ifndef __G_NODE_H__ #define __G_NODE_H__ #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION) #error "Only <glib.h> can be included directly." #endif #include <glib/gmem.h> G_BEGIN_DECLS typedef struct _GNode GNode; /* Tree traverse flags */ typedef enum { G_TRAVERSE_LEAVES = 1 << 0, G_TRAVERSE_NON_LEAVES = 1 << 1, G_TRAVERSE_ALL = G_TRAVERSE_LEAVES | G_TRAVERSE_NON_LEAVES, G_TRAVERSE_MASK = 0x03, G_TRAVERSE_LEAFS = G_TRAVERSE_LEAVES, G_TRAVERSE_NON_LEAFS = G_TRAVERSE_NON_LEAVES } GTraverseFlags; /* Tree traverse orders */ typedef enum { G_IN_ORDER, G_PRE_ORDER, G_POST_ORDER, G_LEVEL_ORDER } GTraverseType; typedef gboolean (*GNodeTraverseFunc) (GNode *node, gpointer data); typedef void (*GNodeForeachFunc) (GNode *node, gpointer data); /* N-way tree implementation */ struct _GNode { gpointer data; GNode *next; GNode *prev; GNode *parent; GNode *children; }; /** * G_NODE_IS_ROOT: * @node: a #GNode * * Returns %TRUE if a #GNode is the root of a tree. * * Returns: %TRUE if the #GNode is the root of a tree * (i.e. it has no parent or siblings) */ #define G_NODE_IS_ROOT(node) (((GNode*) (node))->parent == NULL && \ ((GNode*) (node))->prev == NULL && \ ((GNode*) (node))->next == NULL) /** * G_NODE_IS_LEAF: * @node: a #GNode * * Returns %TRUE if a #GNode is a leaf node. * * Returns: %TRUE if the #GNode is a leaf node * (i.e. it has no children) */ #define G_NODE_IS_LEAF(node) (((GNode*) (node))->children == NULL) GLIB_AVAILABLE_IN_ALL GNode* g_node_new (gpointer data); GLIB_AVAILABLE_IN_ALL void g_node_destroy (GNode *root); GLIB_AVAILABLE_IN_ALL void g_node_unlink (GNode *node); GLIB_AVAILABLE_IN_ALL GNode* g_node_copy_deep (GNode *node, GCopyFunc copy_func, gpointer data); GLIB_AVAILABLE_IN_ALL GNode* g_node_copy (GNode *node); GLIB_AVAILABLE_IN_ALL GNode* g_node_insert (GNode *parent, gint position, GNode *node); GLIB_AVAILABLE_IN_ALL GNode* g_node_insert_before (GNode *parent, GNode *sibling, GNode *node); GLIB_AVAILABLE_IN_ALL GNode* g_node_insert_after (GNode *parent, GNode *sibling, GNode *node); GLIB_AVAILABLE_IN_ALL GNode* g_node_prepend (GNode *parent, GNode *node); GLIB_AVAILABLE_IN_ALL guint g_node_n_nodes (GNode *root, GTraverseFlags flags); GLIB_AVAILABLE_IN_ALL GNode* g_node_get_root (GNode *node); GLIB_AVAILABLE_IN_ALL gboolean g_node_is_ancestor (GNode *node, GNode *descendant); GLIB_AVAILABLE_IN_ALL guint g_node_depth (GNode *node); GLIB_AVAILABLE_IN_ALL GNode* g_node_find (GNode *root, GTraverseType order, GTraverseFlags flags, gpointer data); /* convenience macros */ /** * g_node_append: * @parent: the #GNode to place the new #GNode under * @node: the #GNode to insert * * Inserts a #GNode as the last child of the given parent. * * Returns: the inserted #GNode */ #define g_node_append(parent, node) \ g_node_insert_before ((parent), NULL, (node)) /** * g_node_insert_data: * @parent: the #GNode to place the new #GNode under * @position: the position to place the new #GNode at. If position is -1, * the new #GNode is inserted as the last child of @parent * @data: the data for the new #GNode * * Inserts a new #GNode at the given position. * * Returns: the new #GNode */ #define g_node_insert_data(parent, position, data) \ g_node_insert ((parent), (position), g_node_new (data)) /** * g_node_insert_data_after: * @parent: the #GNode to place the new #GNode under * @sibling: the sibling #GNode to place the new #GNode after * @data: the data for the new #GNode * * Inserts a new #GNode after the given sibling. * * Returns: the new #GNode */ #define g_node_insert_data_after(parent, sibling, data) \ g_node_insert_after ((parent), (sibling), g_node_new (data)) /** * g_node_insert_data_before: * @parent: the #GNode to place the new #GNode under * @sibling: the sibling #GNode to place the new #GNode before * @data: the data for the new #GNode * * Inserts a new #GNode before the given sibling. * * Returns: the new #GNode */ #define g_node_insert_data_before(parent, sibling, data) \ g_node_insert_before ((parent), (sibling), g_node_new (data)) /** * g_node_prepend_data: * @parent: the #GNode to place the new #GNode under * @data: the data for the new #GNode * * Inserts a new #GNode as the first child of the given parent. * * Returns: the new #GNode */ #define g_node_prepend_data(parent, data) \ g_node_prepend ((parent), g_node_new (data)) /** * g_node_append_data: * @parent: the #GNode to place the new #GNode under * @data: the data for the new #GNode * * Inserts a new #GNode as the last child of the given parent. * * Returns: the new #GNode */ #define g_node_append_data(parent, data) \ g_node_insert_before ((parent), NULL, g_node_new (data)) /* traversal function, assumes that 'node' is root * (only traverses 'node' and its subtree). * this function is just a high level interface to * low level traversal functions, optimized for speed. */ GLIB_AVAILABLE_IN_ALL void g_node_traverse (GNode *root, GTraverseType order, GTraverseFlags flags, gint max_depth, GNodeTraverseFunc func, gpointer data); /* return the maximum tree height starting with 'node', this is an expensive * operation, since we need to visit all nodes. this could be shortened by * adding 'guint height' to struct _GNode, but then again, this is not very * often needed, and would make g_node_insert() more time consuming. */ GLIB_AVAILABLE_IN_ALL guint g_node_max_height (GNode *root); GLIB_AVAILABLE_IN_ALL void g_node_children_foreach (GNode *node, GTraverseFlags flags, GNodeForeachFunc func, gpointer data); GLIB_AVAILABLE_IN_ALL void g_node_reverse_children (GNode *node); GLIB_AVAILABLE_IN_ALL guint g_node_n_children (GNode *node); GLIB_AVAILABLE_IN_ALL GNode* g_node_nth_child (GNode *node, guint n); GLIB_AVAILABLE_IN_ALL GNode* g_node_last_child (GNode *node); GLIB_AVAILABLE_IN_ALL GNode* g_node_find_child (GNode *node, GTraverseFlags flags, gpointer data); GLIB_AVAILABLE_IN_ALL gint g_node_child_position (GNode *node, GNode *child); GLIB_AVAILABLE_IN_ALL gint g_node_child_index (GNode *node, gpointer data); GLIB_AVAILABLE_IN_ALL GNode* g_node_first_sibling (GNode *node); GLIB_AVAILABLE_IN_ALL GNode* g_node_last_sibling (GNode *node); /** * g_node_prev_sibling: * @node: a #GNode * * Gets the previous sibling of a #GNode. * * Returns: the previous sibling of @node, or %NULL if @node is the first * node or %NULL */ #define g_node_prev_sibling(node) ((node) ? \ ((GNode*) (node))->prev : NULL) /** * g_node_next_sibling: * @node: a #GNode * * Gets the next sibling of a #GNode. * * Returns: the next sibling of @node, or %NULL if @node is the last node * or %NULL */ #define g_node_next_sibling(node) ((node) ? \ ((GNode*) (node))->next : NULL) /** * g_node_first_child: * @node: a #GNode * * Gets the first child of a #GNode. * * Returns: the first child of @node, or %NULL if @node is %NULL * or has no children */ #define g_node_first_child(node) ((node) ? \ ((GNode*) (node))->children : NULL) G_END_DECLS #endif /* __G_NODE_H__ */