layout/style/ShadowParts.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_ShadowParts_h
   8 #define mozilla_ShadowParts_h
   9
  10 #include "nsAtomHashKeys.h"
  11 #include "nsTHashtable.h"
  12 #include "nsClassHashtable.h"
  13 #include "nsRefPtrHashtable.h"
  14 #include "nsStringFwd.h"
  15
  16 namespace mozilla {
  17
  18 class ShadowParts final {
  19  public:
  20   ShadowParts(ShadowParts&&) = default;
  21   ShadowParts(const ShadowParts&) = delete;
  22   static ShadowParts Parse(const nsAString&);
  23
  24   using PartList = AutoTArray<RefPtr<nsAtom>, 1>;
  25
  26   PartList* Get(nsAtom* aName) const { return mMappings.Get(aName); }
  27
  28   nsAtom* GetReverse(nsAtom* aName) const {
  29     return mReverseMappings.GetWeak(aName);
  30   }
  31
  32 #ifdef DEBUG
  33   void Dump() const;
  34 #endif
  35
  36  private:
  37   ShadowParts() = default;
  38
  39   // TODO(emilio): If the two hashtables take a lot of memory we should consider
  40   // just using an nsTArray<Pair<>> or something.
  41   nsClassHashtable<nsAtomHashKey, PartList> mMappings;
  42   nsRefPtrHashtable<nsAtomHashKey, nsAtom> mReverseMappings;
  43 };
  44
  45 }  // namespace mozilla
  46
  47 #endif  // mozilla_ShadowParts_h