/* -*- 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/. */

/* base class for all rule types in a CSS style sheet */

#include "Rule.h"

#include "mozilla/css/GroupRule.h"

#include "mozilla/dom/DocumentOrShadowRoot.h"

#include "nsCCUncollectableMarker.h"

#include "nsIDocument.h"

#include "nsWrapperCacheInlines.h"

using namespace mozilla;

using namespace mozilla::dom;

namespace mozilla {

namespace css {

NS_IMPL_CYCLE_COLLECTING_ADDREF(Rule)

NS_IMPL_CYCLE_COLLECTING_RELEASE(Rule)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Rule)

  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY

  NS_INTERFACE_MAP_ENTRY(nsISupports)

NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(Rule)

bool

Rule::IsCCLeaf() const

{

  return !PreservingWrapper();

}

bool

Rule::IsKnownLive() const

{

  if (HasKnownLiveWrapper()) {

    return true;

  }

  StyleSheet* sheet = GetStyleSheet();

  if (!sheet) {

    return false;

  }

  if (!sheet->IsKeptAliveByDocument()) {

    return false;

  }

  return nsCCUncollectableMarker::InGeneration(

    GetComposedDoc()->GetMarkedCCGeneration());

}

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(Rule)

  return tmp->IsCCLeaf() || tmp->IsKnownLive();

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(Rule)

  // Please see documentation for nsCycleCollectionParticipant::CanSkip* for why

  // we need to check HasNothingToTrace here but not in the other two CanSkip

  // methods.

  return tmp->IsCCLeaf() ||

    (tmp->IsKnownLive() && tmp->HasNothingToTrace(tmp));

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(Rule)

  return tmp->IsCCLeaf() || tmp->IsKnownLive();

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END

/* virtual */ void

Rule::DropSheetReference()

{

  mSheet = nullptr;

}

void

Rule::SetCssText(const nsAString& aCssText)

{

  // We used to throw for some rule types, but not all.  Specifically, we did

  // not throw for StyleRule.  Let's just always not throw.

}

Rule*

Rule::GetParentRule() const

{

  return mParentRule;

}

} // namespace css

} // namespace mozilla