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/CSSParser.h"
26#include "core/css/CSSSelector.h"
27#include "core/css/CSSStyleSheet.h"
28#include "core/css/PropertySetCSSStyleDeclaration.h"
29#include "core/css/StylePropertySet.h"
30#include "core/css/StyleRule.h"
31#include "wtf/text/StringBuilder.h"
32
33namespace WebCore {
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 (m_propertiesCSSOMWrapper)
51        m_propertiesCSSOMWrapper->clearParentRule();
52
53    if (hasCachedSelectorText()) {
54        selectorTextCache().remove(this);
55        setHasCachedSelectorText(false);
56    }
57}
58
59CSSStyleDeclaration* CSSStyleRule::style() const
60{
61    if (!m_propertiesCSSOMWrapper) {
62        m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_styleRule->mutableProperties(), const_cast<CSSStyleRule*>(this));
63    }
64    return m_propertiesCSSOMWrapper.get();
65}
66
67String CSSStyleRule::generateSelectorText() const
68{
69    StringBuilder builder;
70    for (const CSSSelector* selector = m_styleRule->selectorList().first(); selector; selector = CSSSelectorList::next(selector)) {
71        if (selector != m_styleRule->selectorList().first())
72            builder.append(", ");
73        builder.append(selector->selectorText());
74    }
75    return builder.toString();
76}
77
78String CSSStyleRule::selectorText() const
79{
80    if (hasCachedSelectorText()) {
81        ASSERT(selectorTextCache().contains(this));
82        return selectorTextCache().get(this);
83    }
84
85    ASSERT(!selectorTextCache().contains(this));
86    String text = generateSelectorText();
87    selectorTextCache().set(this, text);
88    setHasCachedSelectorText(true);
89    return text;
90}
91
92void CSSStyleRule::setSelectorText(const String& selectorText)
93{
94    CSSParser p(parserContext());
95    CSSSelectorList selectorList;
96    p.parseSelector(selectorText, selectorList);
97    if (!selectorList.isValid())
98        return;
99
100    CSSStyleSheet::RuleMutationScope mutationScope(this);
101
102    m_styleRule->wrapperAdoptSelectorList(selectorList);
103
104    if (hasCachedSelectorText()) {
105        selectorTextCache().remove(this);
106        setHasCachedSelectorText(false);
107    }
108}
109
110String CSSStyleRule::cssText() const
111{
112    StringBuilder result;
113    result.append(selectorText());
114    result.appendLiteral(" { ");
115    String decls = m_styleRule->properties()->asText();
116    result.append(decls);
117    if (!decls.isEmpty())
118        result.append(' ');
119    result.append('}');
120    return result.toString();
121}
122
123void CSSStyleRule::reattach(StyleRuleBase* rule)
124{
125    ASSERT(rule);
126    m_styleRule = toStyleRule(rule);
127    if (m_propertiesCSSOMWrapper)
128        m_propertiesCSSOMWrapper->reattach(m_styleRule->mutableProperties());
129}
130
131} // namespace WebCore
132