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320df163a2
gtk3/gtk/gtkrbtree.c
Benjamin Otte 320df163a2 treeview: Make the parity actually store the row number 
Instead of just storing the least significant bit of the row number,
store the full row number. This will soon be useful for accessibility.
But CSS could like it, too.
2011-11-16 04:31:06 +01:00

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/* gtkrbtree.c
* Copyright (C) 2000 Red Hat, Inc., Jonathan Blandford <jrb@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include "gtkrbtree.h"
#include "gtkdebug.h"
static GtkRBNode * _gtk_rbnode_new (GtkRBTree *tree,
gint height);
static void _gtk_rbnode_free (GtkRBNode *node);
static void _gtk_rbnode_rotate_left (GtkRBTree *tree,
GtkRBNode *node);
static void _gtk_rbnode_rotate_right (GtkRBTree *tree,
GtkRBNode *node);
static void _gtk_rbtree_insert_fixup (GtkRBTree *tree,
GtkRBNode *node);
static void _gtk_rbtree_remove_node_fixup (GtkRBTree *tree,
GtkRBNode *node);
static inline void _fixup_validation (GtkRBTree *tree,
GtkRBNode *node);
static inline void _fixup_parity (GtkRBTree *tree,
GtkRBNode *node);
static GtkRBNode *
_gtk_rbnode_new (GtkRBTree *tree,
gint height)
{
GtkRBNode *node = g_slice_new (GtkRBNode);
node->left = tree->nil;
node->right = tree->nil;
node->parent = tree->nil;
node->flags = GTK_RBNODE_RED;
node->parity = 1;
node->count = 1;
node->children = NULL;
node->offset = height;
return node;
}
static void
_gtk_rbnode_free (GtkRBNode *node)
{
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
{
node->left = (gpointer) 0xdeadbeef;
node->right = (gpointer) 0xdeadbeef;
node->parent = (gpointer) 0xdeadbeef;
node->parity = 56789;
node->offset = 56789;
node->count = 56789;
node->flags = 0;
}
g_slice_free (GtkRBNode, node);
}
static void
_gtk_rbnode_rotate_left (GtkRBTree *tree,
GtkRBNode *node)
{
gint node_height, right_height;
GtkRBNode *right = node->right;
g_return_if_fail (node != tree->nil);
node_height = node->offset -
(node->left?node->left->offset:0) -
(node->right?node->right->offset:0) -
(node->children?node->children->root->offset:0);
right_height = right->offset -
(right->left?right->left->offset:0) -
(right->right?right->right->offset:0) -
(right->children?right->children->root->offset:0);
node->right = right->left;
if (right->left != tree->nil)
right->left->parent = node;
if (right != tree->nil)
right->parent = node->parent;
if (node->parent != tree->nil)
{
if (node == node->parent->left)
node->parent->left = right;
else
node->parent->right = right;
} else {
tree->root = right;
}
right->left = node;
if (node != tree->nil)
node->parent = right;
node->count = 1 + (node->left?node->left->count:0) +
(node->right?node->right->count:0);
right->count = 1 + (right->left?right->left->count:0) +
(right->right?right->right->count:0);
node->offset = node_height +
(node->left?node->left->offset:0) +
(node->right?node->right->offset:0) +
(node->children?node->children->root->offset:0);
right->offset = right_height +
(right->left?right->left->offset:0) +
(right->right?right->right->offset:0) +
(right->children?right->children->root->offset:0);
_fixup_validation (tree, node);
_fixup_validation (tree, right);
_fixup_parity (tree, node);
_fixup_parity (tree, right);
}
static void
_gtk_rbnode_rotate_right (GtkRBTree *tree,
GtkRBNode *node)
{
gint node_height, left_height;
GtkRBNode *left = node->left;
g_return_if_fail (node != tree->nil);
node_height = node->offset -
(node->left?node->left->offset:0) -
(node->right?node->right->offset:0) -
(node->children?node->children->root->offset:0);
left_height = left->offset -
(left->left?left->left->offset:0) -
(left->right?left->right->offset:0) -
(left->children?left->children->root->offset:0);
node->left = left->right;
if (left->right != tree->nil)
left->right->parent = node;
if (left != tree->nil)
left->parent = node->parent;
if (node->parent != tree->nil)
{
if (node == node->parent->right)
node->parent->right = left;
else
node->parent->left = left;
}
else
{
tree->root = left;
}
/* link node and left */
left->right = node;
if (node != tree->nil)
node->parent = left;
node->count = 1 + (node->left?node->left->count:0) +
(node->right?node->right->count:0);
left->count = 1 + (left->left?left->left->count:0) +
(left->right?left->right->count:0);
node->offset = node_height +
(node->left?node->left->offset:0) +
(node->right?node->right->offset:0) +
(node->children?node->children->root->offset:0);
left->offset = left_height +
(left->left?left->left->offset:0) +
(left->right?left->right->offset:0) +
(left->children?left->children->root->offset:0);
_fixup_validation (tree, node);
_fixup_validation (tree, left);
_fixup_parity (tree, node);
_fixup_parity (tree, left);
}
static void
_gtk_rbtree_insert_fixup (GtkRBTree *tree,
GtkRBNode *node)
{
/* check Red-Black properties */
while (node != tree->root && GTK_RBNODE_GET_COLOR (node->parent) == GTK_RBNODE_RED)
{
/* we have a violation */
if (node->parent == node->parent->parent->left)
{
GtkRBNode *y = node->parent->parent->right;
if (GTK_RBNODE_GET_COLOR (y) == GTK_RBNODE_RED)
{
/* uncle is GTK_RBNODE_RED */
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (y, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent->parent, GTK_RBNODE_RED);
node = node->parent->parent;
}
else
{
/* uncle is GTK_RBNODE_BLACK */
if (node == node->parent->right)
{
/* make node a left child */
node = node->parent;
_gtk_rbnode_rotate_left (tree, node);
}
/* recolor and rotate */
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent->parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_right(tree, node->parent->parent);
}
}
else
{
/* mirror image of above code */
GtkRBNode *y = node->parent->parent->left;
if (GTK_RBNODE_GET_COLOR (y) == GTK_RBNODE_RED)
{
/* uncle is GTK_RBNODE_RED */
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (y, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent->parent, GTK_RBNODE_RED);
node = node->parent->parent;
}
else
{
/* uncle is GTK_RBNODE_BLACK */
if (node == node->parent->left)
{
node = node->parent;
_gtk_rbnode_rotate_right (tree, node);
}
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent->parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_left (tree, node->parent->parent);
}
}
}
GTK_RBNODE_SET_COLOR (tree->root, GTK_RBNODE_BLACK);
}
static void
_gtk_rbtree_remove_node_fixup (GtkRBTree *tree,
GtkRBNode *node)
{
while (node != tree->root && GTK_RBNODE_GET_COLOR (node) == GTK_RBNODE_BLACK)
{
if (node == node->parent->left)
{
GtkRBNode *w = node->parent->right;
if (GTK_RBNODE_GET_COLOR (w) == GTK_RBNODE_RED)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_left (tree, node->parent);
w = node->parent->right;
}
if (GTK_RBNODE_GET_COLOR (w->left) == GTK_RBNODE_BLACK && GTK_RBNODE_GET_COLOR (w->right) == GTK_RBNODE_BLACK)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_RED);
node = node->parent;
}
else
{
if (GTK_RBNODE_GET_COLOR (w->right) == GTK_RBNODE_BLACK)
{
GTK_RBNODE_SET_COLOR (w->left, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_RED);
_gtk_rbnode_rotate_right (tree, w);
w = node->parent->right;
}
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_GET_COLOR (node->parent));
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w->right, GTK_RBNODE_BLACK);
_gtk_rbnode_rotate_left (tree, node->parent);
node = tree->root;
}
}
else
{
GtkRBNode *w = node->parent->left;
if (GTK_RBNODE_GET_COLOR (w) == GTK_RBNODE_RED)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_right (tree, node->parent);
w = node->parent->left;
}
if (GTK_RBNODE_GET_COLOR (w->right) == GTK_RBNODE_BLACK && GTK_RBNODE_GET_COLOR (w->left) == GTK_RBNODE_BLACK)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_RED);
node = node->parent;
}
else
{
if (GTK_RBNODE_GET_COLOR (w->left) == GTK_RBNODE_BLACK)
{
GTK_RBNODE_SET_COLOR (w->right, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_RED);
_gtk_rbnode_rotate_left (tree, w);
w = node->parent->left;
}
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_GET_COLOR (node->parent));
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w->left, GTK_RBNODE_BLACK);
_gtk_rbnode_rotate_right (tree, node->parent);
node = tree->root;
}
}
}
GTK_RBNODE_SET_COLOR (node, GTK_RBNODE_BLACK);
}
GtkRBTree *
_gtk_rbtree_new (void)
{
GtkRBTree *retval;
retval = g_new (GtkRBTree, 1);
retval->parent_tree = NULL;
retval->parent_node = NULL;
retval->nil = g_slice_new (GtkRBNode);
retval->nil->left = NULL;
retval->nil->right = NULL;
retval->nil->parent = NULL;
retval->nil->flags = GTK_RBNODE_BLACK;
retval->nil->count = 0;
retval->nil->offset = 0;
retval->nil->parity = 0;
retval->root = retval->nil;
return retval;
}
static void
_gtk_rbtree_free_helper (GtkRBTree *tree,
GtkRBNode *node,
gpointer data)
{
if (node->children)
_gtk_rbtree_free (node->children);
_gtk_rbnode_free (node);
}
void
_gtk_rbtree_free (GtkRBTree *tree)
{
_gtk_rbtree_traverse (tree,
tree->root,
G_POST_ORDER,
_gtk_rbtree_free_helper,
NULL);
if (tree->parent_node &&
tree->parent_node->children == tree)
tree->parent_node->children = NULL;
_gtk_rbnode_free (tree->nil);
g_free (tree);
}
void
_gtk_rbtree_remove (GtkRBTree *tree)
{
GtkRBTree *tmp_tree;
GtkRBNode *tmp_node;
gint height = tree->root->offset;
guint parity = tree->root->parity;
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
#endif
tmp_tree = tree->parent_tree;
tmp_node = tree->parent_node;
/* ugly hack to make _fixup_validation work in the first iteration of the
* loop below */
GTK_RBNODE_UNSET_FLAG (tree->root, GTK_RBNODE_DESCENDANTS_INVALID);
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
_fixup_validation (tmp_tree, tmp_node);
tmp_node->offset -= height;
tmp_node->parity -= parity;
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
tmp_tree = tree->parent_tree;
tmp_node = tree->parent_node;
_gtk_rbtree_free (tree);
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tmp_tree);
#endif
}
GtkRBNode *
_gtk_rbtree_insert_after (GtkRBTree *tree,
GtkRBNode *current,
gint height,
gboolean valid)
{
GtkRBNode *node;
gboolean right = TRUE;
GtkRBNode *tmp_node;
GtkRBTree *tmp_tree;
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
{
g_print ("\n\n_gtk_rbtree_insert_after: %p\n", current);
_gtk_rbtree_debug_spew (tree);
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif /* G_ENABLE_DEBUG */
if (current != NULL && current->right != tree->nil)
{
current = current->right;
while (current->left != tree->nil)
current = current->left;
right = FALSE;
}
/* setup new node */
node = _gtk_rbnode_new (tree, height);
node->parent = (current?current:tree->nil);
/* insert node in tree */
if (current)
{
if (right)
current->right = node;
else
current->left = node;
tmp_node = node->parent;
tmp_tree = tree;
}
else
{
tree->root = node;
tmp_node = tree->parent_node;
tmp_tree = tree->parent_tree;
}
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
/* We only want to propagate the count if we are in the tree we
* started in. */
if (tmp_tree == tree)
tmp_node->count++;
tmp_node->parity += 1;
tmp_node->offset += height;
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
if (valid)
_gtk_rbtree_node_mark_valid (tree, node);
else
_gtk_rbtree_node_mark_invalid (tree, node);
_gtk_rbtree_insert_fixup (tree, node);
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
{
g_print ("_gtk_rbtree_insert_after finished...\n");
_gtk_rbtree_debug_spew (tree);
g_print ("\n\n");
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif /* G_ENABLE_DEBUG */
return node;
}
GtkRBNode *
_gtk_rbtree_insert_before (GtkRBTree *tree,
GtkRBNode *current,
gint height,
gboolean valid)
{
GtkRBNode *node;
gboolean left = TRUE;
GtkRBNode *tmp_node;
GtkRBTree *tmp_tree;
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
{
g_print ("\n\n_gtk_rbtree_insert_before: %p\n", current);
_gtk_rbtree_debug_spew (tree);
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif /* G_ENABLE_DEBUG */
if (current != NULL && current->left != tree->nil)
{
current = current->left;
while (current->right != tree->nil)
current = current->right;
left = FALSE;
}
/* setup new node */
node = _gtk_rbnode_new (tree, height);
node->parent = (current?current:tree->nil);
/* insert node in tree */
if (current)
{
if (left)
current->left = node;
else
current->right = node;
tmp_node = node->parent;
tmp_tree = tree;
}
else
{
tree->root = node;
tmp_node = tree->parent_node;
tmp_tree = tree->parent_tree;
}
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
/* We only want to propagate the count if we are in the tree we
* started in. */
if (tmp_tree == tree)
tmp_node->count++;
tmp_node->parity += 1;
tmp_node->offset += height;
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
if (valid)
_gtk_rbtree_node_mark_valid (tree, node);
else
_gtk_rbtree_node_mark_invalid (tree, node);
_gtk_rbtree_insert_fixup (tree, node);
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
{
g_print ("_gtk_rbtree_insert_before finished...\n");
_gtk_rbtree_debug_spew (tree);
g_print ("\n\n");
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif /* G_ENABLE_DEBUG */
return node;
}
GtkRBNode *
_gtk_rbtree_find_count (GtkRBTree *tree,
gint count)
{
GtkRBNode *node;
node = tree->root;
while (node != tree->nil && (node->left->count + 1 != count))
{
if (node->left->count >= count)
node = node->left;
else
{
count -= (node->left->count + 1);
node = node->right;
}
}
if (node == tree->nil)
return NULL;
return node;
}
void
_gtk_rbtree_node_set_height (GtkRBTree *tree,
GtkRBNode *node,
gint height)
{
gint diff = height - GTK_RBNODE_GET_HEIGHT (node);
GtkRBNode *tmp_node = node;
GtkRBTree *tmp_tree = tree;
if (diff == 0)
return;
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
tmp_node->offset += diff;
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
#endif
}
void
_gtk_rbtree_node_mark_invalid (GtkRBTree *tree,
GtkRBNode *node)
{
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID))
return;
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_INVALID);
do
{
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_DESCENDANTS_INVALID))
return;
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
node = node->parent;
if (node == tree->nil)
{
node = tree->parent_node;
tree = tree->parent_tree;
}
}
while (node);
}
#if 0
/* Draconian version. */
void
_gtk_rbtree_node_mark_invalid (GtkRBTree *tree,
GtkRBNode *node)
{
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_INVALID);
do
{
_fixup_validation (tree, node);
node = node->parent;
if (node == tree->nil)
{
node = tree->parent_node;
tree = tree->parent_tree;
}
}
while (node);
}
#endif
void
_gtk_rbtree_node_mark_valid (GtkRBTree *tree,
GtkRBNode *node)
{
if ((!GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID)) &&
(!GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_COLUMN_INVALID)))
return;
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_INVALID);
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_COLUMN_INVALID);
do
{
if ((GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID)) ||
(GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_COLUMN_INVALID)) ||
(node->children && GTK_RBNODE_FLAG_SET (node->children->root, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->left != tree->nil && GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->right != tree->nil && GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID)))
return;
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
node = node->parent;
if (node == tree->nil)
{
node = tree->parent_node;
tree = tree->parent_tree;
}
}
while (node);
}
#if 0
/* Draconian version */
void
_gtk_rbtree_node_mark_valid (GtkRBTree *tree,
GtkRBNode *node)
{
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_INVALID);
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_COLUMN_INVALID);
do
{
_fixup_validation (tree, node);
node = node->parent;
if (node == tree->nil)
{
node = tree->parent_node;
tree = tree->parent_tree;
}
}
while (node);
}
#endif
/* Assume tree is the root node as it doesn't set DESCENDANTS_INVALID above.
*/
void
_gtk_rbtree_column_invalid (GtkRBTree *tree)
{
GtkRBNode *node;
if (tree == NULL)
return;
node = tree->root;
g_assert (node);
while (node->left != tree->nil)
node = node->left;
do
{
if (! (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID)))
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_COLUMN_INVALID);
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
if (node->children)
_gtk_rbtree_column_invalid (node->children);
}
while ((node = _gtk_rbtree_next (tree, node)) != NULL);
}
void
_gtk_rbtree_mark_invalid (GtkRBTree *tree)
{
GtkRBNode *node;
if (tree == NULL)
return;
node = tree->root;
g_assert (node);
while (node->left != tree->nil)
node = node->left;
do
{
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_INVALID);
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
if (node->children)
_gtk_rbtree_mark_invalid (node->children);
}
while ((node = _gtk_rbtree_next (tree, node)) != NULL);
}
void
_gtk_rbtree_set_fixed_height (GtkRBTree *tree,
gint height,
gboolean mark_valid)
{
GtkRBNode *node;
if (tree == NULL)
return;
node = tree->root;
g_assert (node);
while (node->left != tree->nil)
node = node->left;
do
{
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID))
{
_gtk_rbtree_node_set_height (tree, node, height);
if (mark_valid)
_gtk_rbtree_node_mark_valid (tree, node);
}
if (node->children)
_gtk_rbtree_set_fixed_height (node->children, height, mark_valid);
}
while ((node = _gtk_rbtree_next (tree, node)) != NULL);
}
typedef struct _GtkRBReorder
{
GtkRBTree *children;
gint height;
gint flags;
gint order;
gint invert_order;
gint parity;
} GtkRBReorder;
static int
gtk_rbtree_reorder_sort_func (gconstpointer a,
gconstpointer b)
{
return ((GtkRBReorder *) a)->order - ((GtkRBReorder *) b)->order;
}
static int
gtk_rbtree_reorder_invert_func (gconstpointer a,
gconstpointer b)
{
return ((GtkRBReorder *) a)->invert_order - ((GtkRBReorder *) b)->invert_order;
}
static void
gtk_rbtree_reorder_fixup (GtkRBTree *tree,
GtkRBNode *node)
{
if (node == tree->nil)
return;
node->parity = 1;
if (node->left != tree->nil)
{
gtk_rbtree_reorder_fixup (tree, node->left);
node->offset += node->left->offset;
node->parity += node->left->parity;
}
if (node->right != tree->nil)
{
gtk_rbtree_reorder_fixup (tree, node->right);
node->offset += node->right->offset;
node->parity += node->right->parity;
}
if (node->children)
{
node->offset += node->children->root->offset;
node->parity += node->children->root->parity;
}
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID) ||
(node->right != tree->nil && GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->left != tree->nil && GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->children && GTK_RBNODE_FLAG_SET (node->children->root, GTK_RBNODE_DESCENDANTS_INVALID)))
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
else
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
}
/* It basically pulls everything out of the tree, rearranges it, and puts it
* back together. Our strategy is to keep the old RBTree intact, and just
* rearrange the contents. When that is done, we go through and update the
* heights. There is probably a more elegant way to write this function. If
* anyone wants to spend the time writing it, patches will be accepted.
*/
void
_gtk_rbtree_reorder (GtkRBTree *tree,
gint *new_order,
gint length)
{
GtkRBReorder reorder = { NULL };
GArray *array;
GtkRBNode *node;
gint i;
g_return_if_fail (tree != NULL);
g_return_if_fail (length > 0);
g_return_if_fail (tree->root->count == length);
/* Sort the trees values in the new tree. */
array = g_array_sized_new (FALSE, FALSE, sizeof (GtkRBReorder), length);
for (i = 0; i < length; i++)
{
reorder.order = new_order[i];
reorder.invert_order = i;
g_array_append_val (array, reorder);
}
g_array_sort(array, gtk_rbtree_reorder_sort_func);
/* rewind node*/
node = tree->root;
while (node && node->left != tree->nil)
node = node->left;
for (i = 0; i < length; i++)
{
g_assert (node != tree->nil);
g_array_index (array, GtkRBReorder, i).children = node->children;
g_array_index (array, GtkRBReorder, i).flags = GTK_RBNODE_NON_COLORS & node->flags;
g_array_index (array, GtkRBReorder, i).height = GTK_RBNODE_GET_HEIGHT (node);
node = _gtk_rbtree_next (tree, node);
}
g_array_sort (array, gtk_rbtree_reorder_invert_func);
/* rewind node*/
node = tree->root;
while (node && node->left != tree->nil)
node = node->left;
/* Go through the tree and change the values to the new ones. */
for (i = 0; i < length; i++)
{
reorder = g_array_index (array, GtkRBReorder, i);
node->children = reorder.children;
if (node->children)
node->children->parent_node = node;
node->flags = GTK_RBNODE_GET_COLOR (node) | reorder.flags;
/* We temporarily set the height to this. */
node->offset = reorder.height;
node = _gtk_rbtree_next (tree, node);
}
gtk_rbtree_reorder_fixup (tree, tree->root);
g_array_free (array, TRUE);
}
gint
_gtk_rbtree_node_find_offset (GtkRBTree *tree,
GtkRBNode *node)
{
GtkRBNode *last;
gint retval;
g_assert (node);
g_assert (node->left);
retval = node->left->offset;
while (tree && node && node != tree->nil)
{
last = node;
node = node->parent;
/* Add left branch, plus children, iff we came from the right */
if (node->right == last)
retval += node->offset - node->right->offset;
if (node == tree->nil)
{
node = tree->parent_node;
tree = tree->parent_tree;
/* Add the parent node, plus the left branch. */
if (node)
retval += node->left->offset + GTK_RBNODE_GET_HEIGHT (node);
}
}
return retval;
}
gint
_gtk_rbtree_node_find_parity (GtkRBTree *tree,
GtkRBNode *node)
{
GtkRBNode *last;
gint retval;
g_assert (node);
g_assert (node->left);
retval = node->left->parity;
while (tree && node && node != tree->nil)
{
last = node;
node = node->parent;
/* Add left branch, plus children, iff we came from the right */
if (node->right == last)
retval += node->parity - node->right->parity;
if (node == tree->nil)
{
node = tree->parent_node;
tree = tree->parent_tree;
/* Add the parent node, plus the left branch. */
if (node)
retval += node->left->parity + 1; /* 1 == GTK_RBNODE_GET_PARITY() */
}
}
return retval % 2;
}
gint
_gtk_rbtree_real_find_offset (GtkRBTree *tree,
gint height,
GtkRBTree **new_tree,
GtkRBNode **new_node)
{
GtkRBNode *tmp_node;
g_assert (tree);
if (height < 0)
{
*new_tree = NULL;
*new_node = NULL;
return 0;
}
tmp_node = tree->root;
while (tmp_node != tree->nil &&
(tmp_node->left->offset > height ||
(tmp_node->offset - tmp_node->right->offset) < height))
{
if (tmp_node->left->offset > height)
tmp_node = tmp_node->left;
else
{
height -= (tmp_node->offset - tmp_node->right->offset);
tmp_node = tmp_node->right;
}
}
if (tmp_node == tree->nil)
{
*new_tree = NULL;
*new_node = NULL;
return 0;
}
if (tmp_node->children)
{
if ((tmp_node->offset -
tmp_node->right->offset -
tmp_node->children->root->offset) > height)
{
*new_tree = tree;
*new_node = tmp_node;
return (height - tmp_node->left->offset);
}
return _gtk_rbtree_real_find_offset (tmp_node->children,
height - tmp_node->left->offset -
(tmp_node->offset -
tmp_node->left->offset -
tmp_node->right->offset -
tmp_node->children->root->offset),
new_tree,
new_node);
}
*new_tree = tree;
*new_node = tmp_node;
return (height - tmp_node->left->offset);
}
gint
_gtk_rbtree_find_offset (GtkRBTree *tree,
gint height,
GtkRBTree **new_tree,
GtkRBNode **new_node)
{
g_assert (tree);
if ((height < 0) ||
(height >= tree->root->offset))
{
*new_tree = NULL;
*new_node = NULL;
return 0;
}
return _gtk_rbtree_real_find_offset (tree, height, new_tree, new_node);
}
void
_gtk_rbtree_remove_node (GtkRBTree *tree,
GtkRBNode *node)
{
GtkRBNode *x, *y;
GtkRBTree *tmp_tree;
GtkRBNode *tmp_node;
gint y_height;
g_return_if_fail (tree != NULL);
g_return_if_fail (node != NULL);
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
{
g_print ("\n\n_gtk_rbtree_remove_node: %p\n", node);
_gtk_rbtree_debug_spew (tree);
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif /* G_ENABLE_DEBUG */
/* make sure we're deleting a node that's actually in the tree */
for (x = node; x->parent != tree->nil; x = x->parent)
;
g_return_if_fail (x == tree->root);
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
#endif
if (node->left == tree->nil || node->right == tree->nil)
{
y = node;
}
else
{
y = node->right;
while (y->left != tree->nil)
y = y->left;
}
/* adjust count only beneath tree */
for (x = y; x != tree->nil; x = x->parent)
{
x->count--;
}
/* offsets and parity adjust all the way up through parent trees */
y_height = GTK_RBNODE_GET_HEIGHT (y);
tmp_tree = tree;
tmp_node = y;
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
tmp_node->offset -= (y_height + (y->children?y->children->root->offset:0));
_fixup_validation (tmp_tree, tmp_node);
_fixup_parity (tmp_tree, tmp_node);
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
/* x is y's only child, or nil */
if (y->left != tree->nil)
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
x->parent = y->parent;
if (y->parent != tree->nil)
{
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
}
else
{
tree->root = x;
}
/* We need to clean up the validity of the tree.
*/
tmp_tree = tree;
tmp_node = x;
do
{
/* We skip the first time, iff x is nil */
if (tmp_node != tmp_tree->nil)
{
_fixup_validation (tmp_tree, tmp_node);
_fixup_parity (tmp_tree, tmp_node);
}
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
while (tmp_tree != NULL);
if (y != node)
{
gint diff;
/* Copy the node over */
if (GTK_RBNODE_GET_COLOR (node) == GTK_RBNODE_BLACK)
node->flags = ((y->flags & (GTK_RBNODE_NON_COLORS)) | GTK_RBNODE_BLACK);
else
node->flags = ((y->flags & (GTK_RBNODE_NON_COLORS)) | GTK_RBNODE_RED);
node->children = y->children;
if (y->children)
{
node->children = y->children;
node->children->parent_node = node;
}
else
{
node->children = NULL;
}
_fixup_validation (tree, node);
_fixup_parity (tree, node);
/* We want to see how different our height is from the previous node.
* To do this, we compare our current height with our supposed height.
*/
diff = y_height - GTK_RBNODE_GET_HEIGHT (node);
tmp_tree = tree;
tmp_node = node;
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
tmp_node->offset += diff;
_fixup_validation (tmp_tree, tmp_node);
_fixup_parity (tmp_tree, tmp_node);
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
}
if (GTK_RBNODE_GET_COLOR (y) == GTK_RBNODE_BLACK)
_gtk_rbtree_remove_node_fixup (tree, x);
_gtk_rbnode_free (y);
#ifdef G_ENABLE_DEBUG
if (gtk_get_debug_flags () & GTK_DEBUG_TREE)
{
g_print ("_gtk_rbtree_remove_node finished...\n");
_gtk_rbtree_debug_spew (tree);
g_print ("\n\n");
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif /* G_ENABLE_DEBUG */
}
GtkRBNode *
_gtk_rbtree_next (GtkRBTree *tree,
GtkRBNode *node)
{
g_return_val_if_fail (tree != NULL, NULL);
g_return_val_if_fail (node != NULL, NULL);
/* Case 1: the node's below us. */
if (node->right != tree->nil)
{
node = node->right;
while (node->left != tree->nil)
node = node->left;
return node;
}
/* Case 2: it's an ancestor */
while (node->parent != tree->nil)
{
if (node->parent->right == node)
node = node->parent;
else
return (node->parent);
}
/* Case 3: There is no next node */
return NULL;
}
GtkRBNode *
_gtk_rbtree_prev (GtkRBTree *tree,
GtkRBNode *node)
{
g_return_val_if_fail (tree != NULL, NULL);
g_return_val_if_fail (node != NULL, NULL);
/* Case 1: the node's below us. */
if (node->left != tree->nil)
{
node = node->left;
while (node->right != tree->nil)
node = node->right;
return node;
}
/* Case 2: it's an ancestor */
while (node->parent != tree->nil)
{
if (node->parent->left == node)
node = node->parent;
else
return (node->parent);
}
/* Case 3: There is no next node */
return NULL;
}
void
_gtk_rbtree_next_full (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTree **new_tree,
GtkRBNode **new_node)
{
g_return_if_fail (tree != NULL);
g_return_if_fail (node != NULL);
g_return_if_fail (new_tree != NULL);
g_return_if_fail (new_node != NULL);
if (node->children)
{
*new_tree = node->children;
*new_node = (*new_tree)->root;
while ((*new_node)->left != (*new_tree)->nil)
*new_node = (*new_node)->left;
return;
}
*new_tree = tree;
*new_node = _gtk_rbtree_next (tree, node);
while ((*new_node == NULL) &&
(*new_tree != NULL))
{
*new_node = (*new_tree)->parent_node;
*new_tree = (*new_tree)->parent_tree;
if (*new_tree)
*new_node = _gtk_rbtree_next (*new_tree, *new_node);
}
}
void
_gtk_rbtree_prev_full (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTree **new_tree,
GtkRBNode **new_node)
{
g_return_if_fail (tree != NULL);
g_return_if_fail (node != NULL);
g_return_if_fail (new_tree != NULL);
g_return_if_fail (new_node != NULL);
*new_tree = tree;
*new_node = _gtk_rbtree_prev (tree, node);
if (*new_node == NULL)
{
*new_node = (*new_tree)->parent_node;
*new_tree = (*new_tree)->parent_tree;
}
else
{
while ((*new_node)->children)
{
*new_tree = (*new_node)->children;
*new_node = (*new_tree)->root;
while ((*new_node)->right != (*new_tree)->nil)
*new_node = (*new_node)->right;
}
}
}
gint
_gtk_rbtree_get_depth (GtkRBTree *tree)
{
GtkRBTree *tmp_tree;
gint depth = 0;
tmp_tree = tree->parent_tree;
while (tmp_tree)
{
++depth;
tmp_tree = tmp_tree->parent_tree;
}
return depth;
}
static void
_gtk_rbtree_traverse_pre_order (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTreeTraverseFunc func,
gpointer data)
{
if (node == tree->nil)
return;
(* func) (tree, node, data);
_gtk_rbtree_traverse_pre_order (tree, node->left, func, data);
_gtk_rbtree_traverse_pre_order (tree, node->right, func, data);
}
static void
_gtk_rbtree_traverse_post_order (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTreeTraverseFunc func,
gpointer data)
{
if (node == tree->nil)
return;
_gtk_rbtree_traverse_post_order (tree, node->left, func, data);
_gtk_rbtree_traverse_post_order (tree, node->right, func, data);
(* func) (tree, node, data);
}
void
_gtk_rbtree_traverse (GtkRBTree *tree,
GtkRBNode *node,
GTraverseType order,
GtkRBTreeTraverseFunc func,
gpointer data)
{
g_return_if_fail (tree != NULL);
g_return_if_fail (node != NULL);
g_return_if_fail (func != NULL);
g_return_if_fail (order <= G_LEVEL_ORDER);
switch (order)
{
case G_PRE_ORDER:
_gtk_rbtree_traverse_pre_order (tree, node, func, data);
break;
case G_POST_ORDER:
_gtk_rbtree_traverse_post_order (tree, node, func, data);
break;
case G_IN_ORDER:
case G_LEVEL_ORDER:
default:
g_warning ("unsupported traversal order.");
break;
}
}
static inline
void _fixup_validation (GtkRBTree *tree,
GtkRBNode *node)
{
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID) ||
GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_COLUMN_INVALID) ||
(node->left != tree->nil && GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->right != tree->nil && GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->children != NULL && GTK_RBNODE_FLAG_SET (node->children->root, GTK_RBNODE_DESCENDANTS_INVALID)))
{
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
}
else
{
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
}
}
static inline
void _fixup_parity (GtkRBTree *tree,
GtkRBNode *node)
{
node->parity = 1 +
(node->children != NULL ? node->children->root->parity : 0) +
node->left->parity + node->right->parity;
}
#ifdef G_ENABLE_DEBUG
static guint
get_parity (GtkRBNode *node)
{
guint child_total = 0;
/* The parity of a node is node->parity minus
* the parity of left, right, and children.
*
* This is equivalent to saying that if left, right, children
* sum to 0 parity, then node->parity is the parity of node,
* and if left, right, children are odd parity, then
* node->parity is the reverse of the node's parity.
*/
child_total += (guint) node->left->parity;
child_total += (guint) node->right->parity;
if (node->children)
child_total += (guint) node->children->root->parity;
return child_total + 1;
}
static guint
count_parity (GtkRBTree *tree,
GtkRBNode *node)
{
guint res;
if (node == tree->nil)
return 0;
res =
count_parity (tree, node->left) +
count_parity (tree, node->right) +
(guint)1 +
(node->children ? count_parity (node->children, node->children->root) : 0);
if (res != node->parity)
g_print ("parity incorrect for node\n");
if (get_parity (node) != node->parity)
g_error ("Node has incorrect parity %u, should be %u", node->parity, get_parity (node));
return res;
}
static gint
_count_nodes (GtkRBTree *tree,
GtkRBNode *node)
{
gint res;
if (node == tree->nil)
return 0;
g_assert (node->left);
g_assert (node->right);
res = (_count_nodes (tree, node->left) +
_count_nodes (tree, node->right) + 1);
if (res != node->count)
g_print ("Tree failed\n");
return res;
}
static void
_gtk_rbtree_test_height (GtkRBTree *tree,
GtkRBNode *node)
{
gint computed_offset = 0;
/* This whole test is sort of a useless truism. */
if (node->left != tree->nil)
computed_offset += node->left->offset;
if (node->right != tree->nil)
computed_offset += node->right->offset;
if (node->children && node->children->root != node->children->nil)
computed_offset += node->children->root->offset;
if (GTK_RBNODE_GET_HEIGHT (node) + computed_offset != node->offset)
g_error ("node has broken offset\n");
if (node->left != tree->nil)
_gtk_rbtree_test_height (tree, node->left);
if (node->right != tree->nil)
_gtk_rbtree_test_height (tree, node->right);
if (node->children && node->children->root != node->children->nil)
_gtk_rbtree_test_height (node->children, node->children->root);
}
static void
_gtk_rbtree_test_dirty (GtkRBTree *tree,
GtkRBNode *node,
gint expected_dirtyness)
{
if (expected_dirtyness)
{
g_assert (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_COLUMN_INVALID) ||
GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID) ||
(node->left != tree->nil && GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->right != tree->nil && GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->children && GTK_RBNODE_FLAG_SET (node->children->root, GTK_RBNODE_DESCENDANTS_INVALID)));
}
else
{
g_assert (! GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_COLUMN_INVALID) &&
! GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID));
if (node->left != tree->nil)
g_assert (! GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID));
if (node->right != tree->nil)
g_assert (! GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID));
if (node->children != NULL)
g_assert (! GTK_RBNODE_FLAG_SET (node->children->root, GTK_RBNODE_DESCENDANTS_INVALID));
}
if (node->left != tree->nil)
_gtk_rbtree_test_dirty (tree, node->left, GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID));
if (node->right != tree->nil)
_gtk_rbtree_test_dirty (tree, node->right, GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID));
if (node->children != NULL && node->children->root != node->children->nil)
_gtk_rbtree_test_dirty (node->children, node->children->root, GTK_RBNODE_FLAG_SET (node->children->root, GTK_RBNODE_DESCENDANTS_INVALID));
}
static void _gtk_rbtree_test_structure (GtkRBTree *tree);
static void
_gtk_rbtree_test_structure_helper (GtkRBTree *tree,
GtkRBNode *node)
{
g_assert (node != tree->nil);
g_assert (node->left != NULL);
g_assert (node->right != NULL);
g_assert (node->parent != NULL);
if (node->left != tree->nil)
{
g_assert (node->left->parent == node);
_gtk_rbtree_test_structure_helper (tree, node->left);
}
if (node->right != tree->nil)
{
g_assert (node->right->parent == node);
_gtk_rbtree_test_structure_helper (tree, node->right);
}
if (node->children != NULL)
{
g_assert (node->children->parent_tree == tree);
g_assert (node->children->parent_node == node);
_gtk_rbtree_test_structure (node->children);
}
}
static void
_gtk_rbtree_test_structure (GtkRBTree *tree)
{
g_assert (tree->root);
if (tree->root == tree->nil)
return;
g_assert (tree->root->parent == tree->nil);
_gtk_rbtree_test_structure_helper (tree, tree->root);
}
void
_gtk_rbtree_test (const gchar *where,
GtkRBTree *tree)
{
GtkRBTree *tmp_tree;
if (tree == NULL)
return;
/* Test the entire tree */
tmp_tree = tree;
while (tmp_tree->parent_tree)
tmp_tree = tmp_tree->parent_tree;
g_assert (tmp_tree->nil != NULL);
if (tmp_tree->root == tmp_tree->nil)
return;
_gtk_rbtree_test_structure (tmp_tree);
g_assert ((_count_nodes (tmp_tree, tmp_tree->root->left) +
_count_nodes (tmp_tree, tmp_tree->root->right) + 1) == tmp_tree->root->count);
_gtk_rbtree_test_height (tmp_tree, tmp_tree->root);
_gtk_rbtree_test_dirty (tmp_tree, tmp_tree->root, GTK_RBNODE_FLAG_SET (tmp_tree->root, GTK_RBNODE_DESCENDANTS_INVALID));
g_assert (count_parity (tmp_tree, tmp_tree->root) == tmp_tree->root->parity);
}
static void
_gtk_rbtree_debug_spew_helper (GtkRBTree *tree,
GtkRBNode *node,
gint depth)
{
gint i;
for (i = 0; i < depth; i++)
g_print ("\t");
g_print ("(%p - %s) (Offset %d) (Parity %d) (Validity %d%d%d)\n",
node,
(GTK_RBNODE_GET_COLOR (node) == GTK_RBNODE_BLACK)?"BLACK":" RED ",
node->offset,
node->parity,
(GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_DESCENDANTS_INVALID))?1:0,
(GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID))?1:0,
(GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_COLUMN_INVALID))?1:0);
if (node->children != NULL)
{
g_print ("Looking at child.\n");
_gtk_rbtree_debug_spew (node->children);
g_print ("Done looking at child.\n");
}
if (node->left != tree->nil)
{
_gtk_rbtree_debug_spew_helper (tree, node->left, depth+1);
}
if (node->right != tree->nil)
{
_gtk_rbtree_debug_spew_helper (tree, node->right, depth+1);
}
}
void
_gtk_rbtree_debug_spew (GtkRBTree *tree)
{
g_return_if_fail (tree != NULL);
if (tree->root == tree->nil)
g_print ("Empty tree...\n");
else
_gtk_rbtree_debug_spew_helper (tree, tree->root, 0);
}
#endif /* G_ENABLE_DEBUG */
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