blob: 69f4cd5c487312bd6399634fb0684a122664dc18 [file] [log] [blame]
/*
* Copyright (C) 2006 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "NodeList.h"
#include <stdlib.h>
extern NodeList* NodeList_new(Node* parentNode)
{
Node_ref(parentNode);
NodeList* nodeList = (NodeList*)malloc(sizeof(NodeList));
nodeList->parentNode = parentNode;
nodeList->refCount = 0;
return nodeList;
}
extern unsigned NodeList_length(NodeList* nodeList)
{
/* Linear count from tail -- good enough for our purposes here */
unsigned i = 0;
NodeLink* n = nodeList->parentNode->childNodesTail;
while (n) {
n = n->prev;
++i;
}
return i;
}
extern Node* NodeList_item(NodeList* nodeList, unsigned index)
{
unsigned length = NodeList_length(nodeList);
if (index >= length)
return NULL;
/* Linear search from tail -- good enough for our purposes here */
NodeLink* n = nodeList->parentNode->childNodesTail;
unsigned i = 0;
unsigned count = length - 1 - index;
while (i < count) {
++i;
n = n->prev;
}
return n->node;
}
extern void NodeList_ref(NodeList* nodeList)
{
++nodeList->refCount;
}
extern void NodeList_deref(NodeList* nodeList)
{
if (--nodeList->refCount == 0) {
Node_deref(nodeList->parentNode);
free(nodeList);
}
}