1/*
2 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
3 * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
4 * Copyright (C) 2002, 2005, 2006, 2008, 2012, 2013 Apple Inc. All rights reserved.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public License
17 * along with this library; see the file COPYING.LIB. If not, write to
18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21
22#include "config.h"
23#include "CSSStyleRule.h"
24
25#include "CSSParser.h"
26#include "CSSStyleSheet.h"
27#include "PropertySetCSSStyleDeclaration.h"
28#include "RuleSet.h"
29#include "StyleProperties.h"
30#include "StyleRule.h"
31#include <wtf/NeverDestroyed.h>
32#include <wtf/text/StringBuilder.h>
33
34namespace WebCore {
35
36typedef HashMap<const CSSStyleRule*, String> SelectorTextCache;
37static SelectorTextCache& selectorTextCache()
38{
39 static NeverDestroyed<SelectorTextCache> cache;
40 return cache;
41}
42
43CSSStyleRule::CSSStyleRule(StyleRule& styleRule, CSSStyleSheet* parent)
44 : CSSRule(parent)
45 , m_styleRule(styleRule)
46{
47}
48
49CSSStyleRule::~CSSStyleRule()
50{
51 if (m_propertiesCSSOMWrapper)
52 m_propertiesCSSOMWrapper->clearParentRule();
53
54 if (hasCachedSelectorText()) {
55 selectorTextCache().remove(this);
56 setHasCachedSelectorText(false);
57 }
58}
59
60CSSStyleDeclaration& CSSStyleRule::style()
61{
62 if (!m_propertiesCSSOMWrapper)
63 m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_styleRule->mutableProperties(), *this);
64 return *m_propertiesCSSOMWrapper;
65}
66
67String CSSStyleRule::generateSelectorText() const
68{
69 return m_styleRule->selectorList().selectorsText();
70}
71
72String CSSStyleRule::selectorText() const
73{
74 if (hasCachedSelectorText()) {
75 ASSERT(selectorTextCache().contains(this));
76 return selectorTextCache().get(this);
77 }
78
79 ASSERT(!selectorTextCache().contains(this));
80 String text = generateSelectorText();
81 selectorTextCache().set(this, text);
82 setHasCachedSelectorText(true);
83 return text;
84}
85
86void CSSStyleRule::setSelectorText(const String& selectorText)
87{
88 // FIXME: getMatchedCSSRules can return CSSStyleRules that are missing parent stylesheet pointer while
89 // referencing StyleRules that are part of stylesheet. Disallow mutations in this case.
90 if (!parentStyleSheet())
91 return;
92
93 CSSParser p(parserContext());
94 CSSSelectorList selectorList;
95 p.parseSelector(selectorText, selectorList);
96 if (!selectorList.isValid())
97 return;
98
99 // NOTE: The selector list has to fit into RuleData. <http://webkit.org/b/118369>
100 if (selectorList.componentCount() > RuleData::maximumSelectorComponentCount)
101 return;
102
103 CSSStyleSheet::RuleMutationScope mutationScope(this);
104
105 m_styleRule->wrapperAdoptSelectorList(WTFMove(selectorList));
106
107 if (hasCachedSelectorText()) {
108 selectorTextCache().remove(this);
109 setHasCachedSelectorText(false);
110 }
111}
112
113String CSSStyleRule::cssText() const
114{
115 StringBuilder result;
116 result.append(selectorText());
117 result.appendLiteral(" { ");
118 String decls = m_styleRule->properties().asText();
119 result.append(decls);
120 if (!decls.isEmpty())
121 result.append(' ');
122 result.append('}');
123 return result.toString();
124}
125
126void CSSStyleRule::reattach(StyleRuleBase& rule)
127{
128 m_styleRule = downcast<StyleRule>(rule);
129 if (m_propertiesCSSOMWrapper)
130 m_propertiesCSSOMWrapper->reattach(m_styleRule->mutableProperties());
131}
132
133} // namespace WebCore
134