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 "CSSSelector.h" 27#include "CSSStyleSheet.h" 28#include "Document.h" 29#include "PropertySetCSSStyleDeclaration.h" 30#include "RuleSet.h" 31#include "StylePropertySet.h" 32#include "StyleRule.h" 33#include <wtf/text/StringBuilder.h> 34 35namespace WebCore { 36 37typedef HashMap<const CSSStyleRule*, String> SelectorTextCache; 38static SelectorTextCache& selectorTextCache() 39{ 40 DEFINE_STATIC_LOCAL(SelectorTextCache, cache, ()); 41 return cache; 42} 43 44CSSStyleRule::CSSStyleRule(StyleRule* styleRule, CSSStyleSheet* parent) 45 : CSSRule(parent) 46 , m_styleRule(styleRule) 47{ 48} 49 50CSSStyleRule::~CSSStyleRule() 51{ 52 if (m_propertiesCSSOMWrapper) 53 m_propertiesCSSOMWrapper->clearParentRule(); 54 55 if (hasCachedSelectorText()) { 56 selectorTextCache().remove(this); 57 setHasCachedSelectorText(false); 58 } 59} 60 61CSSStyleDeclaration* CSSStyleRule::style() 62{ 63 if (!m_propertiesCSSOMWrapper) { 64 m_propertiesCSSOMWrapper = StyleRuleCSSStyleDeclaration::create(m_styleRule->mutableProperties(), this); 65 } 66 return m_propertiesCSSOMWrapper.get(); 67} 68 69String CSSStyleRule::generateSelectorText() const 70{ 71 StringBuilder builder; 72 for (const CSSSelector* selector = m_styleRule->selectorList().first(); selector; selector = CSSSelectorList::next(selector)) { 73 if (selector != m_styleRule->selectorList().first()) 74 builder.appendLiteral(", "); 75 builder.append(selector->selectorText()); 76 } 77 return builder.toString(); 78} 79 80String CSSStyleRule::selectorText() const 81{ 82 if (hasCachedSelectorText()) { 83 ASSERT(selectorTextCache().contains(this)); 84 return selectorTextCache().get(this); 85 } 86 87 ASSERT(!selectorTextCache().contains(this)); 88 String text = generateSelectorText(); 89 selectorTextCache().set(this, text); 90 setHasCachedSelectorText(true); 91 return text; 92} 93 94void CSSStyleRule::setSelectorText(const String& selectorText) 95{ 96 // FIXME: getMatchedCSSRules can return CSSStyleRules that are missing parent stylesheet pointer while 97 // referencing StyleRules that are part of stylesheet. Disallow mutations in this case. 98 if (!parentStyleSheet()) 99 return; 100 101 CSSParser p(parserContext()); 102 CSSSelectorList selectorList; 103 p.parseSelector(selectorText, selectorList); 104 if (!selectorList.isValid()) 105 return; 106 107 // NOTE: The selector list has to fit into RuleData. <http://webkit.org/b/118369> 108 if (selectorList.componentCount() > RuleData::maximumSelectorComponentCount) 109 return; 110 111 CSSStyleSheet::RuleMutationScope mutationScope(this); 112 113 m_styleRule->wrapperAdoptSelectorList(selectorList); 114 115 if (hasCachedSelectorText()) { 116 selectorTextCache().remove(this); 117 setHasCachedSelectorText(false); 118 } 119} 120 121String CSSStyleRule::cssText() const 122{ 123 StringBuilder result; 124 result.append(selectorText()); 125 result.appendLiteral(" { "); 126 String decls = m_styleRule->properties()->asText(); 127 result.append(decls); 128 if (!decls.isEmpty()) 129 result.append(' '); 130 result.append('}'); 131 return result.toString(); 132} 133 134void CSSStyleRule::reattach(StyleRuleBase* rule) 135{ 136 ASSERT(rule); 137 ASSERT_WITH_SECURITY_IMPLICATION(rule->isStyleRule()); 138 m_styleRule = static_cast<StyleRule*>(rule); 139 if (m_propertiesCSSOMWrapper) 140 m_propertiesCSSOMWrapper->reattach(m_styleRule->mutableProperties()); 141} 142 143} // namespace WebCore 144