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 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 "core/css/CSSStyleRule.h"
24
25#include "core/css/CSSSelector.h"
26#include "core/css/CSSStyleSheet.h"
27#include "core/css/PropertySetCSSStyleDeclaration.h"
28#include "core/css/StylePropertySet.h"
29#include "core/css/StyleRule.h"
30#include "core/css/parser/CSSParser.h"
31#include "wtf/text/StringBuilder.h"
32
33namespace blink {
34
35typedef HashMap<const CSSStyleRule*, String> SelectorTextCache;
36static SelectorTextCache& selectorTextCache()
37{
38    DEFINE_STATIC_LOCAL(SelectorTextCache, cache, ());
39    return cache;
40}
41
42CSSStyleRule::CSSStyleRule(StyleRule* styleRule, CSSStyleSheet* parent)
43    : CSSRule(parent)
44    , m_styleRule(styleRule)
45{
46}
47
48CSSStyleRule::~CSSStyleRule()
49{
50#if !ENABLE(OILPAN)
51    if (m_propertiesCSSOMWrapper)
52        m_propertiesCSSOMWrapper->clearParentRule();
53#endif
54    if (hasCachedSelectorText()) {
55        selectorTextCache().remove(this);
56        setHasCachedSelectorText(false);
57    }
58}
59
60CSSStyleDeclaration* CSSStyleRule::style() const
61{
62    if (!m_propertiesCSSOMWrapper) {
63        m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_styleRule->mutableProperties(), const_cast<CSSStyleRule*>(this));
64    }
65    return m_propertiesCSSOMWrapper.get();
66}
67
68String CSSStyleRule::generateSelectorText() const
69{
70    StringBuilder builder;
71    for (const CSSSelector* selector = m_styleRule->selectorList().first(); selector; selector = CSSSelectorList::next(*selector)) {
72        if (selector != m_styleRule->selectorList().first())
73            builder.appendLiteral(", ");
74        builder.append(selector->selectorText());
75    }
76    return builder.toString();
77}
78
79String CSSStyleRule::selectorText() const
80{
81    if (hasCachedSelectorText()) {
82        ASSERT(selectorTextCache().contains(this));
83        return selectorTextCache().get(this);
84    }
85
86    ASSERT(!selectorTextCache().contains(this));
87    String text = generateSelectorText();
88    selectorTextCache().set(this, text);
89    setHasCachedSelectorText(true);
90    return text;
91}
92
93void CSSStyleRule::setSelectorText(const String& selectorText)
94{
95    CSSParserContext context(parserContext(), 0);
96    CSSParser p(context);
97    CSSSelectorList selectorList;
98    p.parseSelector(selectorText, selectorList);
99    if (!selectorList.isValid())
100        return;
101
102    CSSStyleSheet::RuleMutationScope mutationScope(this);
103
104    m_styleRule->wrapperAdoptSelectorList(selectorList);
105
106    if (hasCachedSelectorText()) {
107        selectorTextCache().remove(this);
108        setHasCachedSelectorText(false);
109    }
110}
111
112String CSSStyleRule::cssText() const
113{
114    StringBuilder result;
115    result.append(selectorText());
116    result.appendLiteral(" { ");
117    String decls = m_styleRule->properties().asText();
118    result.append(decls);
119    if (!decls.isEmpty())
120        result.append(' ');
121    result.append('}');
122    return result.toString();
123}
124
125void CSSStyleRule::reattach(StyleRuleBase* rule)
126{
127    ASSERT(rule);
128    m_styleRule = toStyleRule(rule);
129    if (m_propertiesCSSOMWrapper)
130        m_propertiesCSSOMWrapper->reattach(m_styleRule->mutableProperties());
131}
132
133void CSSStyleRule::trace(Visitor* visitor)
134{
135    visitor->trace(m_styleRule);
136    visitor->trace(m_propertiesCSSOMWrapper);
137    CSSRule::trace(visitor);
138}
139
140} // namespace blink
141