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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* base class for nsCounterList and nsQuoteList */
#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 = nullptr;
mSize = 0;
}
bool
nsGenConList::DestroyNodesFor(nsIFrame* aFrame)
{
if (!mFirstNode)
return false; // list empty
nsGenConNode* node;
bool destroyed = false;
while (mFirstNode->mPseudoFrame == aFrame) {
destroyed = true;
node = Next(mFirstNode);
bool isLastNode = node == mFirstNode; // before they're dangling
Remove(mFirstNode);
delete mFirstNode;
if (isLastNode) {
mFirstNode = nullptr;
return true;
}
else {
mFirstNode = node;
}
}
node = Next(mFirstNode);
while (node != mFirstNode) {
if (node->mPseudoFrame == aFrame) {
destroyed = true;
nsGenConNode *nextNode = Next(node);
Remove(node);
delete node;
node = nextNode;
} else {
node = Next(node);
}
}
return destroyed;
}
/**
* Compute the type of the pseudo and the content for the pseudo that
* we'll use for comparison purposes.
* @param aContent the content to use is stored here; it's the element
* that generated the ::before or ::after content, or (if not for generated
* content), the frame's own element
* @return -1 for ::before, +1 for ::after, and 0 otherwise.
*/
inline int32_t PseudoCompareType(nsIFrame* aFrame, nsIContent** aContent)
{
nsIAtom *pseudo = aFrame->StyleContext()->GetPseudo();
if (pseudo == nsCSSPseudoElements::before) {
*aContent = aFrame->GetContent()->GetParent();
return -1;
}
if (pseudo == nsCSSPseudoElements::after) {
*aContent = aFrame->GetContent()->GetParent();
return 1;
}
*aContent = aFrame->GetContent();
return 0;
}
/* static */ bool
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;
}
nsIContent *content1;
nsIContent *content2;
int32_t pseudoType1 = PseudoCompareType(frame1, &content1);
int32_t pseudoType2 = PseudoCompareType(frame2, &content2);
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;
}
}
// XXX Switch to the frame version of DoCompareTreePosition?
int32_t 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.
// (We already know it can't be at index mSize.)
uint32_t first = 0, last = mSize - 1;
// A cursor to avoid walking more than the length of the list.
nsGenConNode *curNode = Prev(mFirstNode);
uint32_t curIndex = mSize - 1;
while (first != last) {
uint32_t 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;
NS_ASSERTION(aNode == mFirstNode || NodeAfter(aNode, Prev(aNode)),
"sorting error");
NS_ASSERTION(IsLast(aNode) || NodeAfter(Next(aNode), aNode),
"sorting error");
}
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