1 /*
2 * Copyright (C) 2012 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Neither the name of Google Inc. nor the names of its
11 * contributors may be used to endorse or promote products derived from
12 * this software without specific prior written permission.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifndef ContextFeatures_h
28 #define ContextFeatures_h
29
30 #include "platform/RefCountedSupplement.h"
31
32 namespace WebCore {
33
34 class ContextFeaturesClient;
35 class Document;
36 class Page;
37
38 #if ENABLE(OILPAN)
39 class ContextFeatures FINAL : public GarbageCollectedFinalized<ContextFeatures>, public HeapSupplement<Page> {
40 USING_GARBAGE_COLLECTED_MIXIN(ContextFeatures);
41 public:
42 typedef HeapSupplement<Page> SupplementType;
43 #else
44 class ContextFeatures : public RefCountedSupplement<Page, ContextFeatures> {
45 public:
46 typedef RefCountedSupplement<Page, ContextFeatures> SupplementType;
47 #endif
48 enum FeatureType {
49 DialogElement = 0,
50 PagePopup,
51 MutationEvents,
52 PushState,
53 FeatureTypeSize // Should be the last entry.
54 };
55
56 static const char* supplementName();
57 static ContextFeatures* defaultSwitch();
58 static PassRefPtrWillBeRawPtr<ContextFeatures> create(PassOwnPtr<ContextFeaturesClient>);
59
60 static bool dialogElementEnabled(Document*);
61 static bool pagePopupEnabled(Document*);
62 static bool mutationEventsEnabled(Document*);
63 static bool pushStateEnabled(Document*);
64
65 bool isEnabled(Document*, FeatureType, bool) const;
66 void urlDidChange(Document*);
67
68 #if ENABLE(OILPAN)
trace(Visitor * visitor)69 virtual void trace(Visitor* visitor) OVERRIDE { HeapSupplement<Page>::trace(visitor); }
70 #endif
71
72 private:
ContextFeatures(PassOwnPtr<ContextFeaturesClient> client)73 explicit ContextFeatures(PassOwnPtr<ContextFeaturesClient> client)
74 : m_client(client)
75 { }
76
77 OwnPtr<ContextFeaturesClient> m_client;
78 };
79
80 class ContextFeaturesClient {
81 WTF_MAKE_FAST_ALLOCATED;
82 public:
83 static PassOwnPtr<ContextFeaturesClient> empty();
84
~ContextFeaturesClient()85 virtual ~ContextFeaturesClient() { }
isEnabled(Document *,ContextFeatures::FeatureType,bool defaultValue)86 virtual bool isEnabled(Document*, ContextFeatures::FeatureType, bool defaultValue) { return defaultValue; }
urlDidChange(Document *)87 virtual void urlDidChange(Document*) { }
88 };
89
90 void provideContextFeaturesTo(Page&, PassOwnPtr<ContextFeaturesClient>);
91 void provideContextFeaturesToDocumentFrom(Document&, Page&);
92
create(PassOwnPtr<ContextFeaturesClient> client)93 inline PassRefPtrWillBeRawPtr<ContextFeatures> ContextFeatures::create(PassOwnPtr<ContextFeaturesClient> client)
94 {
95 return adoptRefWillBeNoop(new ContextFeatures(client));
96 }
97
isEnabled(Document * document,FeatureType type,bool defaultValue)98 inline bool ContextFeatures::isEnabled(Document* document, FeatureType type, bool defaultValue) const
99 {
100 if (!m_client)
101 return defaultValue;
102 return m_client->isEnabled(document, type, defaultValue);
103 }
104
urlDidChange(Document * document)105 inline void ContextFeatures::urlDidChange(Document* document)
106 {
107 // FIXME: The original code, commented out below, is obviously
108 // wrong, but the seemingly correct fix of negating the test to
109 // the more logical 'if (!m_client)' crashes the renderer.
110 // See issue 294180
111 //
112 // if (m_client)
113 // return;
114 // m_client->urlDidChange(document);
115 }
116
117 } // namespace WebCore
118
119 #endif // ContextFeatures_h
120