ServoStyleRuleMap.h

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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/. */

#ifndef mozilla_ServoStyleRuleMap_h

#define mozilla_ServoStyleRuleMap_h

#include "mozilla/css/Rule.h"

#include "mozilla/StyleSheet.h"

#include "nsTHashMap.h"

struct StyleLockedStyleRule;

namespace mozilla {

class ServoCSSRuleList;

class ServoStyleSet;

namespace css {

class Rule;

}  // namespace css

namespace dom {

class ShadowRoot;

class ServoStyleRuleMap final {

 public:

  ServoStyleRuleMap() = default;

  void EnsureTable(ServoStyleSet&);

  void EnsureTable(dom::ShadowRoot&);

  css::Rule* Lookup(const StyleLockedDeclarationBlock* aDecls) const {

    return mTable.Get(aDecls);

  void SheetAdded(StyleSheet&);

  void SheetRemoved(StyleSheet&);

  void SheetCloned(StyleSheet&);

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

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

  void RuleDeclarationsChanged(css::Rule&,

                               const StyleLockedDeclarationBlock* aOld,

                               const StyleLockedDeclarationBlock* aNew);

  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.IsEmpty(); }

  void FillTableFromRule(css::Rule&);

  void FillTableFromRuleList(ServoCSSRuleList&);

  void FillTableFromStyleSheet(StyleSheet&);

  using Hashtable = nsTHashMap<nsPtrHashKey<const StyleLockedDeclarationBlock>,

                               WeakPtr<css::Rule>>;

  Hashtable mTable;

};

}  // namespace mozilla

#endif  // mozilla_ServoStyleRuleMap_h