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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Esben Mose Hansen.
*
* Contributor(s):
* Esben Mose Hansen <esben@oek.dk> (original author)
* L. David Baron <dbaron@dbaron.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsGenConList.h"
#include "nsLayoutUtils.h"
void
nsGenConList::Clear()
{
//Delete entire list
if (!mFirstNode)
return;
for (nsGenConNode *node = Next(mFirstNode); node != mFirstNode;
node = Next(mFirstNode))
{
Remove(node);
delete node;
}
delete mFirstNode;
mFirstNode = nsnull;
mSize = 0;
}
PRBool
nsGenConList::DestroyNodesFor(nsIFrame* aFrame)
{
if (!mFirstNode)
return PR_FALSE; // list empty
nsGenConNode* node;
PRBool destroyed = PR_FALSE;
while (mFirstNode->mPseudoFrame == aFrame) {
destroyed = PR_TRUE;
node = Next(mFirstNode);
if (node == mFirstNode) { // Last link
mFirstNode = nsnull;
delete node;
return PR_TRUE;
}
else {
Remove(mFirstNode);
delete mFirstNode;
mFirstNode = node;
}
}
node = Next(mFirstNode);
while (node != mFirstNode) {
if (node->mPseudoFrame == aFrame) {
destroyed = PR_TRUE;
nsGenConNode *nextNode = Next(node);
Remove(node);
delete node;
node = nextNode;
} else {
node = Next(node);
}
}
return destroyed;
}
// return -1 for ::before, +1 for ::after, and 0 otherwise.
inline PRBool PseudoCompareType(nsIFrame *aFrame)
{
nsIAtom *pseudo = aFrame->GetStyleContext()->GetPseudoType();
if (pseudo == nsCSSPseudoElements::before)
return -1;
if (pseudo == nsCSSPseudoElements::after)
return 1;
return 0;
}
/* static */ PRBool
nsGenConList::NodeAfter(const nsGenConNode* aNode1, const nsGenConNode* aNode2)
{
nsIFrame *frame1 = aNode1->mPseudoFrame;
nsIFrame *frame2 = aNode2->mPseudoFrame;
if (frame1 == frame2) {
NS_ASSERTION(aNode2->mContentIndex != aNode1->mContentIndex, "identical");
return aNode1->mContentIndex > aNode2->mContentIndex;
}
PRInt32 pseudoType1 = PseudoCompareType(frame1);
PRInt32 pseudoType2 = PseudoCompareType(frame2);
nsIContent *content1 = frame1->GetContent();
nsIContent *content2 = frame2->GetContent();
if (pseudoType1 == 0 || pseudoType2 == 0) {
if (content1 == content2) {
NS_ASSERTION(pseudoType1 != pseudoType2, "identical");
return pseudoType2 == 0;
}
// We want to treat an element as coming before its :before (preorder
// traversal), so treating both as :before now works.
if (pseudoType1 == 0) pseudoType1 = -1;
if (pseudoType2 == 0) pseudoType2 = -1;
} else {
if (content1 == content2) {
NS_ASSERTION(pseudoType1 != pseudoType2, "identical");
return pseudoType1 == 1;
}
}
PRInt32 cmp = nsLayoutUtils::DoCompareTreePosition(content1, content2,
pseudoType1, -pseudoType2);
NS_ASSERTION(cmp != 0, "same content, different frames");
return cmp > 0;
}
void
nsGenConList::Insert(nsGenConNode* aNode)
{
if (mFirstNode) {
// Check for append.
if (NodeAfter(aNode, Prev(mFirstNode))) {
PR_INSERT_BEFORE(aNode, mFirstNode);
}
else {
// Binary search.
// the range of indices at which |aNode| could end up.
PRUint32 first = 0, last = mSize - 1;
// A cursor to avoid walking more than the length of the list.
nsGenConNode *curNode = Prev(mFirstNode);
PRUint32 curIndex = mSize - 1;
while (first != last) {
PRUint32 test = (first + last) / 2;
if (last == curIndex) {
for ( ; curIndex != test; --curIndex)
curNode = Prev(curNode);
} else {
for ( ; curIndex != test; ++curIndex)
curNode = Next(curNode);
}
if (NodeAfter(aNode, curNode)) {
first = test + 1;
// if we exit the loop, we need curNode to be right
++curIndex;
curNode = Next(curNode);
} else {
last = test;
}
}
PR_INSERT_BEFORE(aNode, curNode);
if (curNode == mFirstNode) {
mFirstNode = aNode;
}
}
}
else {
// initialize list with first node
PR_INIT_CLIST(aNode);
mFirstNode = aNode;
}
++mSize;
}
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