mirror of
https://github.com/classilla/tenfourfox.git
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348 lines
12 KiB
C++
348 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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// vim:cindent:ai:sw=4:ts=4:et:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* implementation of CSS counters (for numbering things) */
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#include "nsCounterManager.h"
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#include "mozilla/Likely.h"
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#include "mozilla/WritingModes.h"
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#include "nsBulletFrame.h" // legacy location for list style type to text code
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#include "nsContentUtils.h"
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#include "nsIContent.h"
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#include "nsTArray.h"
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using namespace mozilla;
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bool
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nsCounterUseNode::InitTextFrame(nsGenConList* aList,
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nsIFrame* aPseudoFrame, nsIFrame* aTextFrame)
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{
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nsCounterNode::InitTextFrame(aList, aPseudoFrame, aTextFrame);
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nsCounterList *counterList = static_cast<nsCounterList*>(aList);
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counterList->Insert(this);
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bool dirty = counterList->IsDirty();
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if (!dirty) {
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if (counterList->IsLast(this)) {
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Calc(counterList);
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nsAutoString contentString;
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GetText(contentString);
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aTextFrame->GetContent()->SetText(contentString, false);
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} else {
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// In all other cases (list already dirty or node not at the end),
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// just start with an empty string for now and when we recalculate
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// the list we'll change the value to the right one.
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counterList->SetDirty();
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return true;
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}
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}
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return false;
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}
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CounterStyle*
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nsCounterUseNode::GetCounterStyle()
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{
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if (!mCounterStyle) {
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const nsCSSValue& style = mCounterFunction->Item(mAllCounters ? 2 : 1);
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CounterStyleManager* manager = mPresContext->CounterStyleManager();
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if (style.GetUnit() == eCSSUnit_Ident) {
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nsString ident;
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style.GetStringValue(ident);
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mCounterStyle = manager->BuildCounterStyle(ident);
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} else if (style.GetUnit() == eCSSUnit_Symbols) {
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mCounterStyle = new AnonymousCounterStyle(style.GetArrayValue());
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} else {
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NS_NOTREACHED("Unknown counter style");
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mCounterStyle = CounterStyleManager::GetDecimalStyle();
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}
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}
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return mCounterStyle;
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}
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// assign the correct |mValueAfter| value to a node that has been inserted
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// Should be called immediately after calling |Insert|.
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void nsCounterUseNode::Calc(nsCounterList *aList)
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{
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NS_ASSERTION(!aList->IsDirty(),
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"Why are we calculating with a dirty list?");
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mValueAfter = aList->ValueBefore(this);
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}
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// assign the correct |mValueAfter| value to a node that has been inserted
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// Should be called immediately after calling |Insert|.
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void nsCounterChangeNode::Calc(nsCounterList *aList)
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{
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NS_ASSERTION(!aList->IsDirty(),
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"Why are we calculating with a dirty list?");
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if (mType == RESET) {
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mValueAfter = mChangeValue;
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} else {
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NS_ASSERTION(mType == INCREMENT, "invalid type");
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mValueAfter = nsCounterManager::IncrementCounter(aList->ValueBefore(this),
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mChangeValue);
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}
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}
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// The text that should be displayed for this counter.
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void
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nsCounterUseNode::GetText(nsString& aResult)
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{
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aResult.Truncate();
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nsAutoTArray<nsCounterNode*, 8> stack;
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stack.AppendElement(static_cast<nsCounterNode*>(this));
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if (mAllCounters && mScopeStart)
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for (nsCounterNode *n = mScopeStart; n->mScopePrev; n = n->mScopeStart)
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stack.AppendElement(n->mScopePrev);
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const char16_t* separator;
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if (mAllCounters)
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separator = mCounterFunction->Item(1).GetStringBufferValue();
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CounterStyle* style = GetCounterStyle();
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WritingMode wm = mPseudoFrame ?
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mPseudoFrame->GetWritingMode() : WritingMode();
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for (uint32_t i = stack.Length() - 1;; --i) {
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nsCounterNode *n = stack[i];
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nsAutoString text;
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bool isTextRTL;
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style->GetCounterText(n->mValueAfter, wm, text, isTextRTL);
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aResult.Append(text);
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if (i == 0)
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break;
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NS_ASSERTION(mAllCounters, "yikes, separator is uninitialized");
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aResult.Append(separator);
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}
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}
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void
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nsCounterList::SetScope(nsCounterNode *aNode)
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{
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// This function is responsible for setting |mScopeStart| and
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// |mScopePrev| (whose purpose is described in nsCounterManager.h).
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// We do this by starting from the node immediately preceding
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// |aNode| in content tree order, which is reasonably likely to be
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// the previous element in our scope (or, for a reset, the previous
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// element in the containing scope, which is what we want). If
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// we're not in the same scope that it is, then it's too deep in the
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// frame tree, so we walk up parent scopes until we find something
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// appropriate.
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if (aNode == First()) {
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aNode->mScopeStart = nullptr;
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aNode->mScopePrev = nullptr;
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return;
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}
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// Get the content node for aNode's rendering object's *parent*,
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// since scope includes siblings, so we want a descendant check on
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// parents.
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nsIContent *nodeContent = aNode->mPseudoFrame->GetContent()->GetParent();
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for (nsCounterNode *prev = Prev(aNode), *start;
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prev; prev = start->mScopePrev) {
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// If |prev| starts a scope (because it's a real or implied
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// reset), we want it as the scope start rather than the start
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// of its enclosing scope. Otherwise, there's no enclosing
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// scope, so the next thing in prev's scope shares its scope
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// start.
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start = (prev->mType == nsCounterNode::RESET || !prev->mScopeStart)
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? prev : prev->mScopeStart;
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// |startContent| is analogous to |nodeContent| (see above).
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nsIContent *startContent = start->mPseudoFrame->GetContent()->GetParent();
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NS_ASSERTION(nodeContent || !startContent,
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"null check on startContent should be sufficient to "
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"null check nodeContent as well, since if nodeContent "
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"is for the root, startContent (which is before it) "
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"must be too");
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// A reset's outer scope can't be a scope created by a sibling.
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if (!(aNode->mType == nsCounterNode::RESET &&
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nodeContent == startContent) &&
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// everything is inside the root (except the case above,
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// a second reset on the root)
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(!startContent ||
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nsContentUtils::ContentIsDescendantOf(nodeContent,
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startContent))) {
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aNode->mScopeStart = start;
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aNode->mScopePrev = prev;
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return;
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}
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}
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aNode->mScopeStart = nullptr;
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aNode->mScopePrev = nullptr;
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}
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void
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nsCounterList::RecalcAll()
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{
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mDirty = false;
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for (nsCounterNode* node = First(); node; node = Next(node)) {
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SetScope(node);
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node->Calc(this);
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if (node->mType == nsCounterNode::USE) {
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nsCounterUseNode *useNode = node->UseNode();
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// Null-check mText, since if the frame constructor isn't
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// batching, we could end up here while the node is being
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// constructed.
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if (useNode->mText) {
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nsAutoString text;
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useNode->GetText(text);
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useNode->mText->SetData(text);
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}
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}
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}
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}
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nsCounterManager::nsCounterManager()
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: mNames()
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{
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}
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bool
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nsCounterManager::AddCounterResetsAndIncrements(nsIFrame *aFrame)
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{
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const nsStyleContent *styleContent = aFrame->StyleContent();
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if (!styleContent->CounterIncrementCount() &&
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!styleContent->CounterResetCount())
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return false;
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// Add in order, resets first, so all the comparisons will be optimized
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// for addition at the end of the list.
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int32_t i, i_end;
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bool dirty = false;
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for (i = 0, i_end = styleContent->CounterResetCount(); i != i_end; ++i)
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dirty |= AddResetOrIncrement(aFrame, i,
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styleContent->GetCounterResetAt(i),
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nsCounterChangeNode::RESET);
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for (i = 0, i_end = styleContent->CounterIncrementCount(); i != i_end; ++i)
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dirty |= AddResetOrIncrement(aFrame, i,
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styleContent->GetCounterIncrementAt(i),
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nsCounterChangeNode::INCREMENT);
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return dirty;
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}
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bool
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nsCounterManager::AddResetOrIncrement(nsIFrame *aFrame, int32_t aIndex,
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const nsStyleCounterData *aCounterData,
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nsCounterNode::Type aType)
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{
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nsCounterChangeNode *node =
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new nsCounterChangeNode(aFrame, aType, aCounterData->mValue, aIndex);
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nsCounterList *counterList = CounterListFor(aCounterData->mCounter);
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counterList->Insert(node);
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if (!counterList->IsLast(node)) {
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// Tell the caller it's responsible for recalculating the entire
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// list.
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counterList->SetDirty();
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return true;
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}
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// Don't call Calc() if the list is already dirty -- it'll be recalculated
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// anyway, and trying to calculate with a dirty list doesn't work.
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if (MOZ_LIKELY(!counterList->IsDirty())) {
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node->Calc(counterList);
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}
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return false;
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}
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nsCounterList*
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nsCounterManager::CounterListFor(const nsSubstring& aCounterName)
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{
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// XXX Why doesn't nsTHashtable provide an API that allows us to use
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// get/put in one hashtable lookup?
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nsCounterList *counterList;
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if (!mNames.Get(aCounterName, &counterList)) {
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counterList = new nsCounterList();
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mNames.Put(aCounterName, counterList);
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}
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return counterList;
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}
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void
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nsCounterManager::RecalcAll()
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{
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for (auto iter = mNames.Iter(); !iter.Done(); iter.Next()) {
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nsCounterList* list = iter.UserData();
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if (list->IsDirty()) {
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list->RecalcAll();
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}
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}
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}
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void
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nsCounterManager::SetAllCounterStylesDirty()
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{
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for (auto iter = mNames.Iter(); !iter.Done(); iter.Next()) {
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nsCounterList* list = iter.UserData();
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bool changed = false;
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for (nsCounterNode* node = list->First(); node; node = list->Next(node)) {
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if (node->mType == nsCounterNode::USE) {
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node->UseNode()->SetCounterStyleDirty();
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changed = true;
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}
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}
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if (changed) {
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list->SetDirty();
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}
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}
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}
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bool
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nsCounterManager::DestroyNodesFor(nsIFrame *aFrame)
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{
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bool destroyedAny = false;
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for (auto iter = mNames.Iter(); !iter.Done(); iter.Next()) {
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nsCounterList* list = iter.UserData();
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if (list->DestroyNodesFor(aFrame)) {
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destroyedAny = true;
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list->SetDirty();
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}
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}
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return destroyedAny;
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}
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#ifdef DEBUG
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void
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nsCounterManager::Dump()
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{
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printf("\n\nCounter Manager Lists:\n");
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for (auto iter = mNames.Iter(); !iter.Done(); iter.Next()) {
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printf("Counter named \"%s\":\n",
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NS_ConvertUTF16toUTF8(iter.Key()).get());
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nsCounterList* list = iter.UserData();
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int32_t i = 0;
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for (nsCounterNode* node = list->First(); node; node = list->Next(node)) {
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const char* types[] = { "RESET", "INCREMENT", "USE" };
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printf(" Node #%d @%p frame=%p index=%d type=%s valAfter=%d\n"
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" scope-start=%p scope-prev=%p",
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i++, (void*)node, (void*)node->mPseudoFrame,
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node->mContentIndex, types[node->mType],
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node->mValueAfter, (void*)node->mScopeStart,
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(void*)node->mScopePrev);
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if (node->mType == nsCounterNode::USE) {
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nsAutoString text;
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node->UseNode()->GetText(text);
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printf(" text=%s", NS_ConvertUTF16toUTF8(text).get());
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}
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printf("\n");
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}
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}
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printf("\n\n");
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}
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#endif
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