1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/*
* Copyright (C) 2013 Google, Inc.
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
* All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef SharedStyleFinder_h
#define SharedStyleFinder_h
#include "core/css/resolver/ElementResolveContext.h"
#include "core/dom/Element.h"
namespace blink {
class Element;
class ComputedStyle;
class RuleFeatureSet;
class RuleSet;
class SpaceSplitString;
class StyleResolver;
class CORE_EXPORT SharedStyleFinder {
STACK_ALLOCATED();
public:
// RuleSets are passed non-const as the act of matching against them can cause
// them to be compacted. :(
SharedStyleFinder(const ElementResolveContext& context,
const RuleFeatureSet& features,
RuleSet* siblingRuleSet,
RuleSet* uncommonAttributeRuleSet,
StyleResolver& styleResolver)
: m_elementAffectedByClassRules(false),
m_features(features),
m_siblingRuleSet(siblingRuleSet),
m_uncommonAttributeRuleSet(uncommonAttributeRuleSet),
m_styleResolver(&styleResolver),
m_context(context) {}
ComputedStyle* findSharedStyle();
private:
Element* findElementForStyleSharing() const;
// Only used when we're collecting stats on styles.
bool documentContainsValidCandidate() const;
bool classNamesAffectedByRules(const SpaceSplitString&) const;
bool canShareStyleWithElement(Element& candidate) const;
bool canShareStyleWithControl(Element& candidate) const;
bool sharingCandidateHasIdenticalStyleAffectingAttributes(
Element& candidate) const;
bool sharingCandidateCanShareHostStyles(Element& candidate) const;
bool sharingCandidateAssignedToSameSlot(Element& candidate) const;
bool sharingCandidateDistributedToSameInsertionPoint(
Element& candidate) const;
bool matchesRuleSet(RuleSet*);
Element& element() const { return *m_context.element(); }
Document& document() const { return element().document(); }
bool m_elementAffectedByClassRules;
const RuleFeatureSet& m_features;
Member<RuleSet> m_siblingRuleSet;
Member<RuleSet> m_uncommonAttributeRuleSet;
Member<StyleResolver> m_styleResolver;
const ElementResolveContext& m_context;
friend class SharedStyleFinderTest;
};
} // namespace blink
#endif // SharedStyleFinder_h
|
