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      1 /*
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * (C) 2002-2003 Dirk Mueller (mueller (at) 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 
     33 namespace blink {
     34 
     35 typedef HashMap<const CSSStyleRule*, String> SelectorTextCache;
     36 static SelectorTextCache& selectorTextCache()
     37 {
     38     DEFINE_STATIC_LOCAL(SelectorTextCache, cache, ());
     39     return cache;
     40 }
     41 
     42 CSSStyleRule::CSSStyleRule(StyleRule* styleRule, CSSStyleSheet* parent)
     43     : CSSRule(parent)
     44     , m_styleRule(styleRule)
     45 {
     46 }
     47 
     48 CSSStyleRule::~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 
     60 CSSStyleDeclaration* 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 
     68 String 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 
     79 String 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 
     93 void 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 
    112 String 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 
    125 void 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 
    133 void 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