1 | /* |
2 | * Copyright (C) 2013-2016 Apple 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 |
6 | * are met: |
7 | * 1. Redistributions of source code must retain the above copyright |
8 | * notice, this list of conditions and the following disclaimer. |
9 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * notice, this list of conditions and the following disclaimer in the |
11 | * documentation and/or other materials provided with the distribution. |
12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
24 | */ |
25 | |
26 | #pragma once |
27 | |
28 | #include "SelectorChecker.h" |
29 | #include "SelectorFilter.h" |
30 | #include "StyleChange.h" |
31 | #include "StyleSharingResolver.h" |
32 | #include "StyleUpdate.h" |
33 | #include <wtf/Function.h> |
34 | #include <wtf/Ref.h> |
35 | |
36 | namespace WebCore { |
37 | |
38 | class Document; |
39 | class Element; |
40 | class Node; |
41 | class RenderStyle; |
42 | class ShadowRoot; |
43 | class StyleResolver; |
44 | |
45 | namespace Style { |
46 | |
47 | class TreeResolver { |
48 | public: |
49 | TreeResolver(Document&); |
50 | ~TreeResolver(); |
51 | |
52 | std::unique_ptr<Update> resolve(); |
53 | |
54 | private: |
55 | std::unique_ptr<RenderStyle> styleForElement(Element&, const RenderStyle& inheritedStyle); |
56 | |
57 | void resolveComposedTree(); |
58 | |
59 | ElementUpdates resolveElement(Element&); |
60 | |
61 | ElementUpdate createAnimatedElementUpdate(std::unique_ptr<RenderStyle>, Element&, Change); |
62 | ElementUpdate resolvePseudoStyle(Element&, const ElementUpdate&, PseudoId); |
63 | |
64 | struct Scope : RefCounted<Scope> { |
65 | StyleResolver& styleResolver; |
66 | SelectorFilter selectorFilter; |
67 | SharingResolver sharingResolver; |
68 | ShadowRoot* shadowRoot { nullptr }; |
69 | Scope* enclosingScope { nullptr }; |
70 | |
71 | Scope(Document&); |
72 | Scope(ShadowRoot&, Scope& enclosingScope); |
73 | ~Scope(); |
74 | }; |
75 | |
76 | struct Parent { |
77 | Element* element; |
78 | const RenderStyle& style; |
79 | Change change { NoChange }; |
80 | DescendantsToResolve descendantsToResolve { DescendantsToResolve::None }; |
81 | bool didPushScope { false }; |
82 | |
83 | Parent(Document&); |
84 | Parent(Element&, const RenderStyle&, Change, DescendantsToResolve); |
85 | }; |
86 | |
87 | Scope& scope() { return m_scopeStack.last(); } |
88 | Parent& parent() { return m_parentStack.last(); } |
89 | |
90 | void pushScope(ShadowRoot&); |
91 | void pushEnclosingScope(); |
92 | void popScope(); |
93 | |
94 | void pushParent(Element&, const RenderStyle&, Change, DescendantsToResolve); |
95 | void popParent(); |
96 | void popParentsToDepth(unsigned depth); |
97 | |
98 | const RenderStyle* parentBoxStyle() const; |
99 | |
100 | Document& m_document; |
101 | std::unique_ptr<RenderStyle> m_documentElementStyle; |
102 | |
103 | Vector<Ref<Scope>, 4> m_scopeStack; |
104 | Vector<Parent, 32> m_parentStack; |
105 | bool m_didSeePendingStylesheet { false }; |
106 | |
107 | std::unique_ptr<Update> m_update; |
108 | }; |
109 | |
110 | void queuePostResolutionCallback(Function<void ()>&&); |
111 | bool postResolutionCallbacksAreSuspended(); |
112 | |
113 | class PostResolutionCallbackDisabler { |
114 | public: |
115 | enum class DrainCallbacks { Yes, No }; |
116 | explicit PostResolutionCallbackDisabler(Document&, DrainCallbacks = DrainCallbacks::Yes); |
117 | ~PostResolutionCallbackDisabler(); |
118 | private: |
119 | DrainCallbacks m_drainCallbacks; |
120 | }; |
121 | |
122 | } |
123 | |
124 | } |
125 | |