/* -*- 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/. */

#ifndef mozilla_ServoStyleRuleMap_h

#define mozilla_ServoStyleRuleMap_h

#include "mozilla/dom/CSSStyleRule.h"

#include "mozilla/StyleSheet.h"

#include "nsDataHashtable.h"

struct RawServoStyleRule;

class nsXBLPrototypeResources;

namespace mozilla {

class ServoCSSRuleList;

class ServoStyleSet;

namespace css {

class Rule;

} // namespace css

namespace dom {

class ShadowRoot;

}

class ServoStyleRuleMap

{

public:

  ServoStyleRuleMap() = default;

  void EnsureTable(ServoStyleSet&);

  void EnsureTable(nsXBLPrototypeResources&);

  void EnsureTable(dom::ShadowRoot&);

  dom::CSSStyleRule* Lookup(const RawServoStyleRule* aRawRule) const

  {

    return mTable.Get(aRawRule);

  }

  void SheetAdded(StyleSheet&);

  void SheetRemoved(StyleSheet&);

  void RuleAdded(StyleSheet& aStyleSheet, css::Rule&);

  void RuleRemoved(StyleSheet& aStyleSheet, css::Rule&);

  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;

  ~ServoStyleRuleMap() = default;

private:

  // Since we would never have a document which contains no style rule,

  // we use IsEmpty as an indication whether we need to walk through

  // all stylesheets to fill the table.

  bool IsEmpty() const { return mTable.Count() == 0; }

  void FillTableFromRule(css::Rule&);

  void FillTableFromRuleList(ServoCSSRuleList&);

  void FillTableFromStyleSheet(StyleSheet&);

  typedef nsDataHashtable<nsPtrHashKey<const RawServoStyleRule>,

                          WeakPtr<dom::CSSStyleRule>> Hashtable;

  Hashtable mTable;

};

} // namespace mozilla

#endif // mozilla_ServoStyleRuleMap_h