tor-browser

ContainStyleScopeManager.cpp (7656B)

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */

#include "ContainStyleScopeManager.h"

#include "CounterStyleManager.h"
#include "mozilla/ServoStyleSet.h"
#include "nsContentUtils.h"
#include "nsCounterManager.h"
#include "nsIContent.h"
#include "nsIContentInlines.h"
#include "nsIFrame.h"
#include "nsQuoteList.h"

namespace mozilla {

nsGenConNode* ContainStyleScope::GetPrecedingElementInGenConList(
   nsGenConList* aList) {
 nsContentUtils::NodeIndexCache cache;
 auto IsAfter = [this, &cache](nsGenConNode* aNode) {
   return nsContentUtils::CompareTreePosition<TreeKind::Flat>(
              mContent, aNode->mPseudoFrame->GetContent(),
              /* aCommonAncestor = */ nullptr, &cache) >= 0;
 };
 auto* last = aList->GetLast();
 if (!last || IsAfter(last)) {
   return last;
 }
 return aList->BinarySearch(IsAfter)->getPrevious();
}

void ContainStyleScope::RecalcAllCounters() {
 GetCounterManager().RecalcAll();
 for (auto* child : mChildren) {
   child->RecalcAllCounters();
 }
}

void ContainStyleScope::RecalcAllQuotes() {
 GetQuoteList().RecalcAll();
 for (auto* child : mChildren) {
   child->RecalcAllQuotes();
 }
}

ContainStyleScope& ContainStyleScopeManager::GetOrCreateScopeForContent(
   nsIContent* aContent) {
 for (; aContent; aContent = aContent->GetFlattenedTreeParent()) {
   auto* element = dom::Element::FromNode(*aContent);
   if (!element) {
     continue;
   }

   // Do not allow elements which have `display: contents` to create style
   // boundaries. See https://github.com/w3c/csswg-drafts/issues/7392.
   if (element->IsDisplayContents()) {
     continue;
   }

   const auto* style = Servo_Element_GetMaybeOutOfDateStyle(element);
   if (!style) {
     continue;
   }

   if (!style->SelfOrAncestorHasContainStyle()) {
     return GetRootScope();
   }

   if (!style->StyleDisplay()->IsContainStyle()) {
     continue;
   }

   if (auto* scope = mScopes.Get(aContent)) {
     return *scope;
   }

   auto& parentScope =
       GetOrCreateScopeForContent(aContent->GetFlattenedTreeParent());
   return *mScopes.InsertOrUpdate(
       aContent, MakeUnique<ContainStyleScope>(this, &parentScope, aContent));
 }

 return GetRootScope();
}

ContainStyleScope& ContainStyleScopeManager::GetScopeForContent(
   nsIContent* aContent) {
 MOZ_ASSERT(aContent);

 if (auto* element = dom::Element::FromNode(*aContent)) {
   if (const auto* style = Servo_Element_GetMaybeOutOfDateStyle(element)) {
     if (!style->SelfOrAncestorHasContainStyle()) {
       return GetRootScope();
     }
   }
 }

 for (; aContent; aContent = aContent->GetFlattenedTreeParent()) {
   if (auto* scope = mScopes.Get(aContent)) {
     return *scope;
   }
 }

 return GetRootScope();
}

void ContainStyleScopeManager::Clear() {
 GetRootScope().GetQuoteList().Clear();
 GetRootScope().GetCounterManager().Clear();

 DestroyScope(&GetRootScope());
 MOZ_DIAGNOSTIC_ASSERT(mScopes.IsEmpty(),
                       "Destroying the root scope should destroy all scopes.");
}

void ContainStyleScopeManager::DestroyScopesFor(nsIFrame* aFrame) {
 if (auto* scope = mScopes.Get(aFrame->GetContent())) {
   DestroyScope(scope);
 }
}

void ContainStyleScopeManager::DestroyScope(ContainStyleScope* aScope) {
 // Deleting a scope modifies the array of children in its parent, so we don't
 // use an iterator here.
 while (!aScope->GetChildren().IsEmpty()) {
   DestroyScope(aScope->GetChildren().ElementAt(0));
 }
 mScopes.Remove(aScope->GetContent());
}

bool ContainStyleScopeManager::DestroyCounterNodesFor(nsIFrame* aFrame) {
 bool result = false;
 for (auto* scope = &GetScopeForContent(aFrame->GetContent()); scope;
      scope = scope->GetParent()) {
   result |= scope->GetCounterManager().DestroyNodesFor(aFrame);
 }
 return result;
}

bool ContainStyleScopeManager::AddCounterChanges(nsIFrame* aNewFrame) {
 return GetOrCreateScopeForContent(
            aNewFrame->GetContent()->GetFlattenedTreeParent())
     .GetCounterManager()
     .AddCounterChanges(aNewFrame);
}

nsCounterList* ContainStyleScopeManager::GetOrCreateCounterList(
   dom::Element& aElement, nsAtom* aCounterName) {
 return GetOrCreateScopeForContent(&aElement)
     .GetCounterManager()
     .GetOrCreateCounterList(aCounterName);
}

bool ContainStyleScopeManager::CounterDirty(nsAtom* aCounterName) {
 return mDirtyCounters.Contains(aCounterName);
}

void ContainStyleScopeManager::SetCounterDirty(nsAtom* aCounterName) {
 mDirtyCounters.Insert(aCounterName);
}

void ContainStyleScopeManager::RecalcAllCounters() {
 GetRootScope().RecalcAllCounters();
 mDirtyCounters.Clear();
}

#if defined(DEBUG) || defined(MOZ_LAYOUT_DEBUGGER)
void ContainStyleScopeManager::DumpCounters() {
 GetRootScope().GetCounterManager().Dump();
 for (auto& entry : mScopes) {
   entry.GetWeak()->GetCounterManager().Dump();
 }
}
#endif

#ifdef ACCESSIBILITY
static bool GetFirstCounterValueForScopeAndFrame(ContainStyleScope* aScope,
                                                nsIFrame* aFrame,
                                                CounterValue& aOrdinal) {
 if (aScope->GetCounterManager().GetFirstCounterValueForFrame(aFrame,
                                                              aOrdinal)) {
   return true;
 }
 for (auto* child : aScope->GetChildren()) {
   if (GetFirstCounterValueForScopeAndFrame(child, aFrame, aOrdinal)) {
     return true;
   }
 }

 return false;
}

void ContainStyleScopeManager::GetSpokenCounterText(nsIFrame* aFrame,
                                                   nsAString& aText) {
 using Tag = StyleCounterStyle::Tag;
 const auto& listStyleType = aFrame->StyleList()->mListStyleType;
 switch (listStyleType.tag) {
   case Tag::None:
     return;
   case Tag::String:
     listStyleType.AsString().AsAtom()->ToString(aText);
     return;
   case Tag::Symbols:
   case Tag::Name:
     break;
 }

 CounterValue ordinal = 1;
 GetFirstCounterValueForScopeAndFrame(&GetRootScope(), aFrame, ordinal);

 aFrame->PresContext()->CounterStyleManager()->WithCounterStyleNameOrSymbols(
     listStyleType, [&](CounterStyle* aStyle) {
       nsAutoString text;
       bool isBullet;
       aStyle->GetSpokenCounterText(ordinal, aFrame->GetWritingMode(), text,
                                    isBullet);
       if (isBullet) {
         aText = text;
         aText.Append(' ');
       } else {
         aStyle->GetPrefix(aText);
         aText += text;
         nsAutoString suffix;
         aStyle->GetSuffix(suffix);
         aText += suffix;
       }
     });
}
#endif

void ContainStyleScopeManager::SetAllCountersDirty() {
 GetRootScope().GetCounterManager().SetAllDirty();
 for (auto& entry : mScopes) {
   entry.GetWeak()->GetCounterManager().SetAllDirty();
 }
}

bool ContainStyleScopeManager::DestroyQuoteNodesFor(nsIFrame* aFrame) {
 bool result = false;
 for (auto* scope = &GetScopeForContent(aFrame->GetContent()); scope;
      scope = scope->GetParent()) {
   result |= scope->GetQuoteList().DestroyNodesFor(aFrame);
 }
 return result;
}

nsQuoteList* ContainStyleScopeManager::QuoteListFor(dom::Element& aElement) {
 return &GetOrCreateScopeForContent(&aElement).GetQuoteList();
}

void ContainStyleScopeManager::RecalcAllQuotes() {
 GetRootScope().RecalcAllQuotes();
}

}  // namespace mozilla