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https://gitlab.winehq.org/wine/wine-gecko.git
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160 lines
4.8 KiB
C++
160 lines
4.8 KiB
C++
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Boris Zbarsky <bzbarsky@mit.edu> (original author)
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* L. David Baron <dbaron@dbaron.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* A class that computes and caches the indices used for :nth-* pseudo-class
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* matching.
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*/
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#include "nsNthIndexCache.h"
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#include "nsIContent.h"
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nsNthIndexCache::nsNthIndexCache()
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{
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}
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nsNthIndexCache::~nsNthIndexCache()
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{
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}
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void
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nsNthIndexCache::Reset()
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{
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mCache.clear();
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}
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inline bool
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nsNthIndexCache::SiblingMatchesElement(nsIContent* aSibling, Element* aElement,
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PRBool aIsOfType)
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{
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return aSibling->IsElement() &&
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(!aIsOfType ||
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aSibling->NodeInfo()->NameAndNamespaceEquals(aElement->NodeInfo()));
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}
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inline bool
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nsNthIndexCache::IndexDetermined(nsIContent* aSibling, Element* aChild,
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PRBool aIsOfType, PRBool aIsFromEnd,
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PRBool aCheckEdgeOnly, PRInt32& aResult)
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{
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if (SiblingMatchesElement(aSibling, aChild, aIsOfType)) {
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if (aCheckEdgeOnly) {
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// The caller only cares whether or not the result is 1, and we
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// now know it's not.
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aResult = -1;
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return true;
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}
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Cache::Ptr siblingEntry = mCache.lookup(aSibling);
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if (siblingEntry) {
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PRInt32 siblingIndex = siblingEntry->value.mNthIndices[aIsOfType][aIsFromEnd];
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NS_ASSERTION(siblingIndex != 0,
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"How can a non-anonymous node have an anonymous sibling?");
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if (siblingIndex > 0) {
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aResult = siblingIndex + 1;
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return true;
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}
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}
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++aResult;
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}
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return false;
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}
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PRInt32
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nsNthIndexCache::GetNthIndex(Element* aChild, PRBool aIsOfType,
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PRBool aIsFromEnd, PRBool aCheckEdgeOnly)
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{
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NS_ASSERTION(aChild->GetParent(), "caller should check GetParent()");
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if (aChild->IsRootOfAnonymousSubtree()) {
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return 0;
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}
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if (!mCache.initialized() && !mCache.init()) {
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// Give up and just don't match.
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return 0;
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}
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Cache::AddPtr entry = mCache.lookupForAdd(aChild);
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if (!entry && !mCache.add(entry, aChild)) {
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// No good; don't match.
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return 0;
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}
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PRInt32 &slot = entry->value.mNthIndices[aIsOfType][aIsFromEnd];
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if (slot != -2 && (slot != -1 || aCheckEdgeOnly)) {
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return slot;
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}
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PRInt32 result = 1;
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if (aIsFromEnd) {
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for (nsIContent *cur = aChild->GetNextSibling();
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cur;
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cur = cur->GetNextSibling()) {
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// It doesn't make sense to do cache lookups for siblings when
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// aIsFromEnd. In general, the cache will only be primed for
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// things that are _before_ us in the DOM.
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if (SiblingMatchesElement(cur, aChild, aIsOfType)) {
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if (aCheckEdgeOnly) {
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// The caller only cares whether or not the result is 1, and we
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// now know it's not.
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result = -1;
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break;
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}
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++result;
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}
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}
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} else {
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for (nsIContent *cur = aChild->GetPreviousSibling();
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cur;
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cur = cur->GetPreviousSibling()) {
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if (IndexDetermined(cur, aChild, aIsOfType, aIsFromEnd, aCheckEdgeOnly,
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result)) {
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break;
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}
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}
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}
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slot = result;
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return result;
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}
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