gecko-dev/layout/style/CSSPageRule.cpp

/* -*- 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 "mozilla/dom/CSSPageRule.h"
#include "mozilla/dom/CSSPageRuleBinding.h"

#include "mozilla/DeclarationBlock.h"
#include "mozilla/ServoBindings.h"

namespace mozilla {
namespace dom {

// -- CSSPageRuleDeclaration ---------------------------------------

CSSPageRuleDeclaration::CSSPageRuleDeclaration(
    already_AddRefed<RawServoDeclarationBlock> aDecls)
    : mDecls(new DeclarationBlock(std::move(aDecls))) {}

CSSPageRuleDeclaration::~CSSPageRuleDeclaration() {
  mDecls->SetOwningRule(nullptr);
}

// QueryInterface implementation for CSSPageRuleDeclaration
NS_INTERFACE_MAP_BEGIN(CSSPageRuleDeclaration)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  // We forward the cycle collection interfaces to Rule(), which is
  // never null (in fact, we're part of that object!)
  if (aIID.Equals(NS_GET_IID(nsCycleCollectionISupports)) ||
      aIID.Equals(NS_GET_IID(nsXPCOMCycleCollectionParticipant))) {
    return Rule()->QueryInterface(aIID, aInstancePtr);
  }
NS_INTERFACE_MAP_END_INHERITING(nsDOMCSSDeclaration)

NS_IMPL_ADDREF_USING_AGGREGATOR(CSSPageRuleDeclaration, Rule())
NS_IMPL_RELEASE_USING_AGGREGATOR(CSSPageRuleDeclaration, Rule())

/* nsDOMCSSDeclaration implementation */

css::Rule* CSSPageRuleDeclaration::GetParentRule() { return Rule(); }

nsINode* CSSPageRuleDeclaration::GetParentObject() {
  return Rule()->GetParentObject();
}

DeclarationBlock* CSSPageRuleDeclaration::GetOrCreateCSSDeclaration(
    Operation aOperation, DeclarationBlock** aCreated) {
  return mDecls;
}

nsresult CSSPageRuleDeclaration::SetCSSDeclaration(
    DeclarationBlock* aDecl, MutationClosureData* aClosureData) {
  MOZ_ASSERT(aDecl, "must be non-null");
  CSSPageRule* rule = Rule();

  if (rule->IsReadOnly()) {
    return NS_OK;
  }

  if (aDecl != mDecls) {
    mDecls->SetOwningRule(nullptr);
    RefPtr<DeclarationBlock> decls = aDecl;
    Servo_PageRule_SetStyle(rule->Raw(), decls->Raw());
    mDecls = std::move(decls);
    mDecls->SetOwningRule(rule);
  }

  return NS_OK;
}

nsDOMCSSDeclaration::ParsingEnvironment
CSSPageRuleDeclaration::GetParsingEnvironment(
    nsIPrincipal* aSubjectPrincipal) const {
  return GetParsingEnvironmentForRule(Rule());
}

// -- CSSPageRule --------------------------------------------------

CSSPageRule::CSSPageRule(RefPtr<RawServoPageRule> aRawRule, StyleSheet* aSheet,
                         css::Rule* aParentRule, uint32_t aLine,
                         uint32_t aColumn)
    : css::Rule(aSheet, aParentRule, aLine, aColumn),
      mRawRule(std::move(aRawRule)),
      mDecls(Servo_PageRule_GetStyle(mRawRule).Consume()) {}

NS_IMPL_ADDREF_INHERITED(CSSPageRule, css::Rule)
NS_IMPL_RELEASE_INHERITED(CSSPageRule, css::Rule)

// QueryInterface implementation for PageRule
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CSSPageRule)
NS_INTERFACE_MAP_END_INHERITING(css::Rule)

NS_IMPL_CYCLE_COLLECTION_CLASS(CSSPageRule)

NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(CSSPageRule, css::Rule)
  // Keep this in sync with IsCCLeaf.

  // Trace the wrapper for our declaration.  This just expands out
  // NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER which we can't use
  // directly because the wrapper is on the declaration, not on us.
  tmp->mDecls.TraceWrapper(aCallbacks, aClosure);
NS_IMPL_CYCLE_COLLECTION_TRACE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CSSPageRule)
  // Keep this in sync with IsCCLeaf.

  // Unlink the wrapper for our declaration.
  //
  // Note that this has to happen before unlinking css::Rule.
  tmp->UnlinkDeclarationWrapper(tmp->mDecls);
  tmp->mDecls.mDecls->SetOwningRule(nullptr);
NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(css::Rule)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CSSPageRule, css::Rule)
  // Keep this in sync with IsCCLeaf.
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

bool CSSPageRule::IsCCLeaf() const {
  if (!Rule::IsCCLeaf()) {
    return false;
  }

  return !mDecls.PreservingWrapper();
}

size_t CSSPageRule::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const {
  // TODO Implement this!
  return aMallocSizeOf(this);
}

#ifdef DEBUG
void CSSPageRule::List(FILE* out, int32_t aIndent) const {
  nsAutoCString str;
  for (int32_t i = 0; i < aIndent; i++) {
    str.AppendLiteral("  ");
  }
  Servo_PageRule_Debug(mRawRule, &str);
  fprintf_stderr(out, "%s\n", str.get());
}
#endif

/* CSSRule implementation */

void CSSPageRule::GetCssText(nsAString& aCssText) const {
  Servo_PageRule_GetCssText(mRawRule, &aCssText);
}

/* CSSPageRule implementation */

nsICSSDeclaration* CSSPageRule::Style() { return &mDecls; }

JSObject* CSSPageRule::WrapObject(JSContext* aCx,
                                  JS::Handle<JSObject*> aGivenProto) {
  return CSSPageRule_Binding::Wrap(aCx, this, aGivenProto);
}

}  // namespace dom
}  // namespace mozilla