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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"
#include "nsIContent.h"
void
nsGenConList::Clear()
{
// Delete entire list.
mNodes.Clear();
while (nsGenConNode* node = mList.popFirst()) {
delete node;
}
mSize = 0;
mLastInserted = nullptr;
}
bool
nsGenConList::DestroyNodesFor(nsIFrame* aFrame)
{
// This algorithm relies on the invariant that nodes of a frame are
// put contiguously in the linked list. This is guaranteed because
// each frame is mapped to only one (nsIContent, pseudoType) pair,
// and the nodes in the linked list are put in the tree order based
// on that pair and offset inside frame.
nsGenConNode* node = mNodes.GetAndRemove(aFrame).valueOr(nullptr);
if (!node) {
return false;
}
MOZ_ASSERT(node->mPseudoFrame == aFrame);
while (node && node->mPseudoFrame == aFrame) {
nsGenConNode* nextNode = Next(node);
Destroy(node);
node = nextNode;
}
// Modification of the list invalidates the cached pointer.
mLastInserted = nullptr;
return true;
}
/**
* 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);
MOZ_ASSERT(cmp != 0, "same content, different frames");
return cmp > 0;
}
void
nsGenConList::Insert(nsGenConNode* aNode)
{
// Check for append.
if (mList.isEmpty() || NodeAfter(aNode, mList.getLast())) {
mList.insertBack(aNode);
} else if (mLastInserted && mLastInserted != mList.getLast() &&
NodeAfter(aNode, mLastInserted) &&
NodeAfter(Next(mLastInserted), aNode)) {
// Fast path for inserting many consecutive nodes in one place
mLastInserted->setNext(aNode);
} 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 = mList.getLast();
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;
}
}
curNode->setPrevious(aNode);
}
++mSize;
mLastInserted = aNode;
// Set the mapping only if it is the first node of the frame.
// The DEBUG blocks below are for ensuring the invariant required by
// nsGenConList::DestroyNodesFor. See comment there.
if (IsFirst(aNode) ||
Prev(aNode)->mPseudoFrame != aNode->mPseudoFrame) {
#ifdef DEBUG
if (nsGenConNode* oldFrameFirstNode = mNodes.Get(aNode->mPseudoFrame)) {
MOZ_ASSERT(Next(aNode) == oldFrameFirstNode,
"oldFrameFirstNode should now be immediately after "
"the newly-inserted one.");
} else {
// If the node is not the only node in the list.
if (!IsFirst(aNode) || !IsLast(aNode)) {
nsGenConNode* nextNode = Next(aNode);
MOZ_ASSERT(!nextNode || nextNode->mPseudoFrame != aNode->mPseudoFrame,
"There shouldn't exist any node for this frame.");
// If the node is neither the first nor the last node
if (!IsFirst(aNode) && !IsLast(aNode)) {
MOZ_ASSERT(Prev(aNode)->mPseudoFrame != nextNode->mPseudoFrame,
"New node should not break contiguity of nodes of "
"the same frame.");
}
}
}
#endif
mNodes.Put(aNode->mPseudoFrame, aNode);
} else {
#ifdef DEBUG
nsGenConNode* frameFirstNode = mNodes.Get(aNode->mPseudoFrame);
MOZ_ASSERT(frameFirstNode, "There should exist node map for the frame.");
for (nsGenConNode* curNode = Prev(aNode);
curNode != frameFirstNode; curNode = Prev(curNode)) {
MOZ_ASSERT(curNode->mPseudoFrame == aNode->mPseudoFrame,
"Every node between frameFirstNode and the new node inserted "
"should refer to the same frame.");
MOZ_ASSERT(!IsFirst(curNode),
"The newly-inserted node should be in a contiguous run after "
"frameFirstNode, thus frameFirstNode should be reached before "
"the first node of mList.");
}
#endif
}
NS_ASSERTION(IsFirst(aNode) || NodeAfter(aNode, Prev(aNode)),
"sorting error");
NS_ASSERTION(IsLast(aNode) || NodeAfter(Next(aNode), aNode),
"sorting error");
}
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