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_ServoStyleRuleMap_h
8 #define mozilla_ServoStyleRuleMap_h
9 
10 #include "mozilla/ServoStyleRule.h"
11 
12 #include "nsDataHashtable.h"
13 
14 struct RawServoStyleRule;
15 class nsXBLPrototypeResources;
16 
17 namespace mozilla {
18 class ServoCSSRuleList;
19 class ServoStyleSet;
20 namespace css {
21 class Rule;
22 }  // namespace css
23 namespace dom {
24 class ShadowRoot;
25 }
26 class ServoStyleRuleMap {
27  public:
28   ServoStyleRuleMap() = default;
29 
30   void EnsureTable(ServoStyleSet&);
31   void EnsureTable(nsXBLPrototypeResources&);
32   void EnsureTable(dom::ShadowRoot&);
33 
Lookup(const RawServoStyleRule * aRawRule)34   ServoStyleRule* Lookup(const RawServoStyleRule* aRawRule) const {
35     return mTable.Get(aRawRule);
36   }
37 
38   void SheetAdded(ServoStyleSheet&);
39   void SheetRemoved(ServoStyleSheet&);
40 
41   void RuleAdded(ServoStyleSheet& aStyleSheet, css::Rule&);
42   void RuleRemoved(ServoStyleSheet& aStyleSheet, css::Rule&);
43 
44   size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
45 
46   ~ServoStyleRuleMap() = default;
47 
48  private:
49   // Since we would never have a document which contains no style rule,
50   // we use IsEmpty as an indication whether we need to walk through
51   // all stylesheets to fill the table.
IsEmpty()52   bool IsEmpty() const { return mTable.Count() == 0; }
53 
54   void FillTableFromRule(css::Rule& aRule);
55   void FillTableFromRuleList(ServoCSSRuleList& aRuleList);
56   void FillTableFromStyleSheet(ServoStyleSheet& aSheet);
57 
58   typedef nsDataHashtable<nsPtrHashKey<const RawServoStyleRule>,
59                           WeakPtr<ServoStyleRule>>
60       Hashtable;
61   Hashtable mTable;
62 };
63 
64 }  // namespace mozilla
65 
66 #endif  // mozilla_ServoStyleRuleMap_h
67