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2c9f162db9fbbf969bdc9d2bd04685345db11159
gtk3/gtk/gtkrbtree.c
Matthias Clasen 2ee7fb1818 Don't use g_print for debug output 
The g_print documentation explicitly says not to do this, since
g_print is meant to be redirected by applications. Instead use
g_message for logging that can be triggered via GTK_DEBUG.
2016-02-28 21:40:23 -05:00

1739 lines
43 KiB
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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, see <http://www.gnu.org/licenses/>.
*/
#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,
GtkRBNode *parent);
static inline void _fixup_validation (GtkRBTree *tree,
GtkRBNode *node);
static inline void _fixup_total_count (GtkRBTree *tree,
GtkRBNode *node);
#ifdef G_ENABLE_DEBUG
static void _gtk_rbtree_test (const gchar *where,
GtkRBTree *tree);
static void _gtk_rbtree_debug_spew (GtkRBTree *tree,
GString *s);
#endif
static const GtkRBNode nil = {
/* .flags = */ GTK_RBNODE_BLACK,
/* rest is NULL */
};
gboolean
_gtk_rbtree_is_nil (GtkRBNode *node)
{
return node == &nil;
}
static GtkRBNode *
_gtk_rbnode_new (GtkRBTree *tree,
gint height)
{
GtkRBNode *node = g_slice_new (GtkRBNode);
node->left = (GtkRBNode *) &nil;
node->right = (GtkRBNode *) &nil;
node->parent = (GtkRBNode *) &nil;
node->flags = GTK_RBNODE_RED;
node->total_count = 1;
node->count = 1;
node->children = NULL;
node->offset = height;
return node;
}
static void
_gtk_rbnode_free (GtkRBNode *node)
{
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (TREE))
{
node->left = (gpointer) 0xdeadbeef;
node->right = (gpointer) 0xdeadbeef;
node->parent = (gpointer) 0xdeadbeef;
node->total_count = 56789;
node->offset = 56789;
node->count = 56789;
node->flags = 0;
}
#endif
g_slice_free (GtkRBNode, node);
}
static void
_gtk_rbnode_rotate_left (GtkRBTree *tree,
GtkRBNode *node)
{
gint node_height, right_height;
GtkRBNode *right;
g_return_if_fail (!_gtk_rbtree_is_nil (node));
g_return_if_fail (!_gtk_rbtree_is_nil (node->right));
right = node->right;
node_height = GTK_RBNODE_GET_HEIGHT (node);
right_height = GTK_RBNODE_GET_HEIGHT (right);
node->right = right->left;
if (!_gtk_rbtree_is_nil (right->left))
right->left->parent = node;
right->parent = node->parent;
if (!_gtk_rbtree_is_nil (node->parent))
{
if (node == node->parent->left)
node->parent->left = right;
else
node->parent->right = right;
} else {
tree->root = right;
}
right->left = node;
node->parent = right;
node->count = 1 + node->left->count + node->right->count;
right->count = 1 + right->left->count + right->right->count;
node->offset = node_height + node->left->offset + node->right->offset +
(node->children ? node->children->root->offset : 0);
right->offset = right_height + right->left->offset + right->right->offset +
(right->children ? right->children->root->offset : 0);
_fixup_validation (tree, node);
_fixup_validation (tree, right);
_fixup_total_count (tree, node);
_fixup_total_count (tree, right);
}
static void
_gtk_rbnode_rotate_right (GtkRBTree *tree,
GtkRBNode *node)
{
gint node_height, left_height;
GtkRBNode *left;
g_return_if_fail (!_gtk_rbtree_is_nil (node));
g_return_if_fail (!_gtk_rbtree_is_nil (node->left));
left = node->left;
node_height = GTK_RBNODE_GET_HEIGHT (node);
left_height = GTK_RBNODE_GET_HEIGHT (left);
node->left = left->right;
if (!_gtk_rbtree_is_nil (left->right))
left->right->parent = node;
left->parent = node->parent;
if (!_gtk_rbtree_is_nil (node->parent))
{
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;
node->parent = left;
node->count = 1 + node->left->count + node->right->count;
left->count = 1 + left->left->count + left->right->count;
node->offset = node_height + node->left->offset + node->right->offset +
(node->children ? node->children->root->offset : 0);
left->offset = left_height + left->left->offset + left->right->offset +
(left->children?left->children->root->offset:0);
_fixup_validation (tree, node);
_fixup_validation (tree, left);
_fixup_total_count (tree, node);
_fixup_total_count (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,
GtkRBNode *parent)
{
while (node != tree->root && GTK_RBNODE_GET_COLOR (node) == GTK_RBNODE_BLACK)
{
if (node == parent->left)
{
GtkRBNode *w = parent->right;
if (GTK_RBNODE_GET_COLOR (w) == GTK_RBNODE_RED)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_left (tree, parent);
w = 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 = 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 = parent->right;
}
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_GET_COLOR (parent));
GTK_RBNODE_SET_COLOR (parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w->right, GTK_RBNODE_BLACK);
_gtk_rbnode_rotate_left (tree, parent);
node = tree->root;
}
}
else
{
GtkRBNode *w = parent->left;
if (GTK_RBNODE_GET_COLOR (w) == GTK_RBNODE_RED)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_right (tree, parent);
w = 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 = 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 = parent->left;
}
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_GET_COLOR (parent));
GTK_RBNODE_SET_COLOR (parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w->left, GTK_RBNODE_BLACK);
_gtk_rbnode_rotate_right (tree, parent);
node = tree->root;
}
}
parent = node->parent;
}
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->root = (GtkRBNode *) &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;
g_free (tree);
}
static void
gtk_rbnode_adjust (GtkRBTree *tree,
GtkRBNode *node,
int count_diff,
int total_count_diff,
int offset_diff)
{
while (tree && node && !_gtk_rbtree_is_nil (node))
{
_fixup_validation (tree, node);
node->offset += offset_diff;
node->count += count_diff;
node->total_count += total_count_diff;
node = node->parent;
if (_gtk_rbtree_is_nil (node))
{
node = tree->parent_node;
tree = tree->parent_tree;
count_diff = 0;
}
}
}
void
_gtk_rbtree_remove (GtkRBTree *tree)
{
#ifdef G_ENABLE_DEBUG
GtkRBTree *tmp_tree;
if (GTK_DEBUG_CHECK (TREE))
_gtk_rbtree_test (G_STRLOC, tree);
#endif
/* 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);
gtk_rbnode_adjust (tree->parent_tree,
tree->parent_node,
0,
- (int) tree->root->total_count,
- tree->root->offset);
#ifdef G_ENABLE_DEBUG
tmp_tree = tree->parent_tree;
#endif
_gtk_rbtree_free (tree);
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (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;
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (TREE))
{
GString *s;
s = g_string_new ("");
g_string_append_printf (s, "_gtk_rbtree_insert_after: %p\n", current);
_gtk_rbtree_debug_spew (tree, s);
g_message ("%s", s->str);
g_string_free (s, TRUE);
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif
if (current != NULL && !_gtk_rbtree_is_nil (current->right))
{
current = current->right;
while (!_gtk_rbtree_is_nil (current->left))
current = current->left;
right = FALSE;
}
/* setup new node */
node = _gtk_rbnode_new (tree, height);
/* insert node in tree */
if (current)
{
node->parent = current;
if (right)
current->right = node;
else
current->left = node;
gtk_rbnode_adjust (tree, node->parent,
1, 1, height);
}
else
{
g_assert (_gtk_rbtree_is_nil (tree->root));
tree->root = node;
gtk_rbnode_adjust (tree->parent_tree, tree->parent_node,
0, 1, height);
}
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_DEBUG_CHECK (TREE))
{
GString *s;
s = g_string_new ("_gtk_rbtree_insert_after finished...\n");
_gtk_rbtree_debug_spew (tree, s);
g_message ("%s", s->str);
g_string_free (s, TRUE);
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif
return node;
}
GtkRBNode *
_gtk_rbtree_insert_before (GtkRBTree *tree,
GtkRBNode *current,
gint height,
gboolean valid)
{
GtkRBNode *node;
gboolean left = TRUE;
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (TREE))
{
GString *s;
s = g_string_new ("");
g_string_append_printf (s, "_gtk_rbtree_insert_before: %p\n", current);
_gtk_rbtree_debug_spew (tree, s);
g_message ("%s", s->str);
g_string_free (s, TRUE);
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif
if (current != NULL && !_gtk_rbtree_is_nil (current->left))
{
current = current->left;
while (!_gtk_rbtree_is_nil (current->right))
current = current->right;
left = FALSE;
}
/* setup new node */
node = _gtk_rbnode_new (tree, height);
/* insert node in tree */
if (current)
{
node->parent = current;
if (left)
current->left = node;
else
current->right = node;
gtk_rbnode_adjust (tree, node->parent,
1, 1, height);
}
else
{
g_assert (_gtk_rbtree_is_nil (tree->root));
tree->root = node;
gtk_rbnode_adjust (tree->parent_tree, tree->parent_node,
0, 1, height);
}
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_DEBUG_CHECK (TREE))
{
GString *s;
s = g_string_new ("_gtk_rbtree_insert_before finished...\n");
_gtk_rbtree_debug_spew (tree, s);
g_message ("%s", s->str);
g_string_free (s, TRUE);
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif
return node;
}
GtkRBNode *
_gtk_rbtree_find_count (GtkRBTree *tree,
gint count)
{
GtkRBNode *node;
node = tree->root;
while (!_gtk_rbtree_is_nil (node) && (node->left->count + 1 != count))
{
if (node->left->count >= count)
node = node->left;
else
{
count -= (node->left->count + 1);
node = node->right;
}
}
if (_gtk_rbtree_is_nil (node))
return NULL;
return node;
}
void
_gtk_rbtree_node_set_height (GtkRBTree *tree,
GtkRBNode *node,
gint height)
{
gint diff = height - GTK_RBNODE_GET_HEIGHT (node);
if (diff == 0)
return;
gtk_rbnode_adjust (tree, node, 0, 0, diff);
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (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 (_gtk_rbtree_is_nil (node))
{
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 (_gtk_rbtree_is_nil (node))
{
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)) ||
(GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID)))
return;
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
node = node->parent;
if (_gtk_rbtree_is_nil (node))
{
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 (_gtk_rbtree_is_nil (node))
{
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 = _gtk_rbtree_first (tree);
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 = _gtk_rbtree_first (tree);
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 = _gtk_rbtree_first (tree);
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);
}
static void
reorder_prepare (GtkRBTree *tree,
GtkRBNode *node,
gpointer data)
{
node->offset -= node->left->offset + node->right->offset;
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
}
static void
reorder_fixup (GtkRBTree *tree,
GtkRBNode *node,
gpointer data)
{
node->offset += node->left->offset + node->right->offset;
node->count = 1 + node->left->count + node->right->count;
_fixup_validation (tree, node);
_fixup_total_count (tree, node);
}
static void
reorder_copy_node (GtkRBTree *tree,
GtkRBNode *to,
GtkRBNode *from)
{
to->flags = (to->flags & GTK_RBNODE_NON_COLORS) | GTK_RBNODE_GET_COLOR (from);
to->left = from->left;
if (!_gtk_rbtree_is_nil (to->left))
to->left->parent = to;
to->right = from->right;
if (!_gtk_rbtree_is_nil (to->right))
to->right->parent = to;
to->parent = from->parent;
if (_gtk_rbtree_is_nil (to->parent))
tree->root = to;
else if (to->parent->left == from)
to->parent->left = to;
else if (to->parent->right == from)
to->parent->right = to;
}
/* 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)
{
GtkRBNode **nodes;
GtkRBNode *node;
gint i, j;
g_return_if_fail (tree != NULL);
g_return_if_fail (length > 0);
g_return_if_fail (tree->root->count == length);
nodes = g_new (GtkRBNode *, length);
_gtk_rbtree_traverse (tree, tree->root, G_PRE_ORDER, reorder_prepare, NULL);
for (node = _gtk_rbtree_first (tree), i = 0;
node;
node = _gtk_rbtree_next (tree, node), i++)
{
nodes[i] = node;
}
for (i = 0; i < length; i++)
{
GtkRBNode tmp = { 0, };
GSList *l, *cycle = NULL;
tmp.offset = -1;
/* already swapped */
if (nodes[i] == NULL)
continue;
/* no need to swap */
if (new_order[i] == i)
continue;
/* make a list out of the pending nodes */
for (j = i; new_order[j] != i; j = new_order[j])
{
cycle = g_slist_prepend (cycle, nodes[j]);
nodes[j] = NULL;
}
node = nodes[j];
reorder_copy_node (tree, &tmp, node);
for (l = cycle; l; l = l->next)
{
reorder_copy_node (tree, node, l->data);
node = l->data;
}
reorder_copy_node (tree, node, &tmp);
nodes[j] = NULL;
g_slist_free (cycle);
}
_gtk_rbtree_traverse (tree, tree->root, G_POST_ORDER, reorder_fixup, NULL);
g_free (nodes);
}
/**
* _gtk_rbtree_contains:
* @tree: a tree
* @potential_child: a potential child of @tree
*
* Checks if @potential_child is a child (direct or via intermediate
* trees) of @tree.
*
* Returns: %TRUE if @potentitial_child is a child of @tree.
**/
gboolean
_gtk_rbtree_contains (GtkRBTree *tree,
GtkRBTree *potential_child)
{
g_return_val_if_fail (tree != NULL, FALSE);
g_return_val_if_fail (potential_child != NULL, FALSE);
do {
potential_child = potential_child->parent_tree;
if (potential_child == tree)
return TRUE;
} while (potential_child != NULL);
return FALSE;
}
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 && !_gtk_rbtree_is_nil (node))
{
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 (_gtk_rbtree_is_nil (node))
{
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;
}
guint
_gtk_rbtree_node_get_index (GtkRBTree *tree,
GtkRBNode *node)
{
GtkRBNode *last;
guint retval;
g_assert (node);
g_assert (node->left);
retval = node->left->total_count;
while (tree && node && !_gtk_rbtree_is_nil (node))
{
last = node;
node = node->parent;
/* Add left branch, plus children, iff we came from the right */
if (node->right == last)
retval += node->total_count - node->right->total_count;
if (_gtk_rbtree_is_nil (node))
{
node = tree->parent_node;
tree = tree->parent_tree;
/* Add the parent node, plus the left branch. */
if (node)
retval += node->left->total_count + 1; /* 1 == GTK_RBNODE_GET_PARITY() */
}
}
return retval;
}
static 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 (!_gtk_rbtree_is_nil (tmp_node) &&
(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 (_gtk_rbtree_is_nil (tmp_node))
{
*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);
}
gboolean
_gtk_rbtree_find_index (GtkRBTree *tree,
guint index,
GtkRBTree **new_tree,
GtkRBNode **new_node)
{
GtkRBNode *tmp_node;
g_assert (tree);
tmp_node = tree->root;
while (!_gtk_rbtree_is_nil (tmp_node))
{
if (tmp_node->left->total_count > index)
{
tmp_node = tmp_node->left;
}
else if (tmp_node->total_count - tmp_node->right->total_count <= index)
{
index -= tmp_node->total_count - tmp_node->right->total_count;
tmp_node = tmp_node->right;
}
else
{
index -= tmp_node->left->total_count;
break;
}
}
if (_gtk_rbtree_is_nil (tmp_node))
{
*new_tree = NULL;
*new_node = NULL;
return FALSE;
}
if (index > 0)
{
g_assert (tmp_node->children);
return _gtk_rbtree_find_index (tmp_node->children,
index - 1,
new_tree,
new_node);
}
*new_tree = tree;
*new_node = tmp_node;
return TRUE;
}
void
_gtk_rbtree_remove_node (GtkRBTree *tree,
GtkRBNode *node)
{
GtkRBNode *x, *y;
gint y_height;
guint y_total_count;
g_return_if_fail (tree != NULL);
g_return_if_fail (node != NULL);
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (TREE))
{
GString *s;
s = g_string_new ("");
g_string_append_printf (s, "_gtk_rbtree_remove_node: %p\n", node);
_gtk_rbtree_debug_spew (tree, s);
g_message ("%s", s->str);
g_string_free (s, TRUE);
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif
/* make sure we're deleting a node that's actually in the tree */
for (x = node; !_gtk_rbtree_is_nil (x->parent); x = x->parent)
;
g_return_if_fail (x == tree->root);
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (TREE))
_gtk_rbtree_test (G_STRLOC, tree);
#endif
if (_gtk_rbtree_is_nil (node->left) ||
_gtk_rbtree_is_nil (node->right))
{
y = node;
}
else
{
y = node->right;
while (!_gtk_rbtree_is_nil (y->left))
y = y->left;
}
y_height = GTK_RBNODE_GET_HEIGHT (y)
+ (y->children ? y->children->root->offset : 0);
y_total_count = 1 + (y->children ? y->children->root->total_count : 0);
/* x is y's only child, or nil */
if (!_gtk_rbtree_is_nil (y->left))
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
if (!_gtk_rbtree_is_nil (x))
x->parent = y->parent;
if (!_gtk_rbtree_is_nil (y->parent))
{
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.
*/
gtk_rbnode_adjust (tree, y, -1, - y_total_count, - y_height);
if (GTK_RBNODE_GET_COLOR (y) == GTK_RBNODE_BLACK)
_gtk_rbtree_remove_node_fixup (tree, x, y->parent);
if (y != node)
{
gint node_height, node_total_count;
/* We want to see how much we remove from the aggregate values.
* This is all the children we remove plus the node's values.
*/
node_height = GTK_RBNODE_GET_HEIGHT (node)
+ (node->children ? node->children->root->offset : 0);
node_total_count = 1
+ (node->children ? node->children->root->total_count : 0);
/* Move the node over */
if (GTK_RBNODE_GET_COLOR (node) != GTK_RBNODE_GET_COLOR (y))
y->flags ^= (GTK_RBNODE_BLACK | GTK_RBNODE_RED);
y->left = node->left;
if (!_gtk_rbtree_is_nil (y->left))
y->left->parent = y;
y->right = node->right;
if (!_gtk_rbtree_is_nil (y->right))
y->right->parent = y;
y->parent = node->parent;
if (!_gtk_rbtree_is_nil (y->parent))
{
if (y->parent->left == node)
y->parent->left = y;
else
y->parent->right = y;
}
else
{
tree->root = y;
}
y->count = node->count;
y->total_count = node->total_count;
y->offset = node->offset;
gtk_rbnode_adjust (tree, y,
0,
y_total_count - node_total_count,
y_height - node_height);
}
_gtk_rbnode_free (node);
#ifdef G_ENABLE_DEBUG
if (GTK_DEBUG_CHECK (TREE))
{
GString *s;
s = g_string_new ("_gtk_rbtree_remove_node finished...\n");
_gtk_rbtree_debug_spew (tree, s);
g_message ("%s", s->str);
g_string_free (s, TRUE);
_gtk_rbtree_test (G_STRLOC, tree);
}
#endif
}
GtkRBNode *
_gtk_rbtree_first (GtkRBTree *tree)
{
GtkRBNode *node;
node = tree->root;
if (_gtk_rbtree_is_nil (node))
return NULL;
while (!_gtk_rbtree_is_nil (node->left))
node = node->left;
return node;
}
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 (!_gtk_rbtree_is_nil (node->right))
{
node = node->right;
while (!_gtk_rbtree_is_nil (node->left))
node = node->left;
return node;
}
/* Case 2: it's an ancestor */
while (!_gtk_rbtree_is_nil (node->parent))
{
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 (!_gtk_rbtree_is_nil (node->left))
{
node = node->left;
while (!_gtk_rbtree_is_nil (node->right))
node = node->right;
return node;
}
/* Case 2: it's an ancestor */
while (!_gtk_rbtree_is_nil (node->parent))
{
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 (!_gtk_rbtree_is_nil ((*new_node)->left))
*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 (!_gtk_rbtree_is_nil ((*new_node)->right))
*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 (_gtk_rbtree_is_nil (node))
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 (_gtk_rbtree_is_nil (node))
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) ||
GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID) ||
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_total_count (GtkRBTree *tree,
GtkRBNode *node)
{
node->total_count = 1 +
(node->children != NULL ? node->children->root->total_count : 0) +
node->left->total_count + node->right->total_count;
}
#ifdef G_ENABLE_DEBUG
static guint
get_total_count (GtkRBNode *node)
{
guint child_total = 0;
child_total += (guint) node->left->total_count;
child_total += (guint) node->right->total_count;
if (node->children)
child_total += (guint) node->children->root->total_count;
return child_total + 1;
}
static guint
count_total (GtkRBTree *tree,
GtkRBNode *node)
{
guint res;
if (_gtk_rbtree_is_nil (node))
return 0;
res =
count_total (tree, node->left) +
count_total (tree, node->right) +
(guint)1 +
(node->children ? count_total (node->children, node->children->root) : 0);
if (res != node->total_count)
g_error ("total count incorrect for node");
if (get_total_count (node) != node->total_count)
g_error ("Node has incorrect total count %u, should be %u", node->total_count, get_total_count (node));
return res;
}
static gint
_count_nodes (GtkRBTree *tree,
GtkRBNode *node)
{
gint res;
if (_gtk_rbtree_is_nil (node))
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_error ("Tree failed");
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 (!_gtk_rbtree_is_nil (node->left))
computed_offset += node->left->offset;
if (!_gtk_rbtree_is_nil (node->right))
computed_offset += node->right->offset;
if (node->children && !_gtk_rbtree_is_nil (node->children->root))
computed_offset += node->children->root->offset;
if (GTK_RBNODE_GET_HEIGHT (node) + computed_offset != node->offset)
g_error ("node has broken offset");
if (!_gtk_rbtree_is_nil (node->left))
_gtk_rbtree_test_height (tree, node->left);
if (!_gtk_rbtree_is_nil (node->right))
_gtk_rbtree_test_height (tree, node->right);
if (node->children && !_gtk_rbtree_is_nil (node->children->root))
_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) ||
GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID) ||
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 (!_gtk_rbtree_is_nil (node->left))
g_assert (! GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID));
if (!_gtk_rbtree_is_nil (node->right))
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 (!_gtk_rbtree_is_nil (node->left))
_gtk_rbtree_test_dirty (tree, node->left, GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID));
if (!_gtk_rbtree_is_nil (node->right))
_gtk_rbtree_test_dirty (tree, node->right, GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID));
if (node->children != NULL && !_gtk_rbtree_is_nil (node->children->root))
_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 (!_gtk_rbtree_is_nil (node));
g_assert (node->left != NULL);
g_assert (node->right != NULL);
g_assert (node->parent != NULL);
if (!_gtk_rbtree_is_nil (node->left))
{
g_assert (node->left->parent == node);
_gtk_rbtree_test_structure_helper (tree, node->left);
}
if (!_gtk_rbtree_is_nil (node->right))
{
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 (_gtk_rbtree_is_nil (tree->root))
return;
g_assert (_gtk_rbtree_is_nil (tree->root->parent));
_gtk_rbtree_test_structure_helper (tree, tree->root);
}
static 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;
if (_gtk_rbtree_is_nil (tmp_tree->root))
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_total (tmp_tree, tmp_tree->root) == tmp_tree->root->total_count);
}
static void
_gtk_rbtree_debug_spew_helper (GtkRBTree *tree,
GtkRBNode *node,
GString *s,
gint depth)
{
gint i;
for (i = 0; i < depth; i++)
g_string_append (s, "\t");
g_string_append_printf (s, "(%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->total_count,
(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_string_append (s, "Looking at child.\n");
_gtk_rbtree_debug_spew (node->children, s);
g_string_append (s, "Done looking at child.\n");
}
if (!_gtk_rbtree_is_nil (node->left))
{
_gtk_rbtree_debug_spew_helper (tree, node->left, s, depth + 1);
}
if (!_gtk_rbtree_is_nil (node->right))
{
_gtk_rbtree_debug_spew_helper (tree, node->right, s, depth + 1);
}
}
static void
_gtk_rbtree_debug_spew (GtkRBTree *tree, GString *s)
{
g_return_if_fail (tree != NULL);
if (_gtk_rbtree_is_nil (tree->root))
g_string_append (s, "Empty tree...");
else
_gtk_rbtree_debug_spew_helper (tree, tree->root, s, 0);
}
#endif /* G_ENABLE_DEBUG */
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