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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
      4  * Copyright (C) 2012 Google Inc. All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1.  Redistributions of source code must retain the above copyright
     10  *     notice, this list of conditions and the following disclaimer.
     11  * 2.  Redistributions in binary form must reproduce the above copyright
     12  *     notice, this list of conditions and the following disclaimer in the
     13  *     documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     18  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     19  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     21  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     22  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     24  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "core/css/resolver/ScopedStyleResolver.h"
     29 
     30 #include "HTMLNames.h"
     31 #include "core/css/CSSStyleSheet.h"
     32 #include "core/css/PageRuleCollector.h"
     33 #include "core/css/RuleFeature.h"
     34 #include "core/css/StyleRule.h"
     35 #include "core/css/StyleSheetContents.h"
     36 #include "core/css/resolver/StyleResolver.h" // For MatchRequest.
     37 #include "core/css/resolver/ViewportStyleResolver.h"
     38 #include "core/dom/Document.h"
     39 #include "core/dom/shadow/ElementShadow.h"
     40 #include "core/dom/shadow/ShadowRoot.h"
     41 #include "core/html/HTMLStyleElement.h"
     42 
     43 namespace WebCore {
     44 
     45 ContainerNode* ScopedStyleResolver::scopingNodeFor(Document& document, const CSSStyleSheet* sheet)
     46 {
     47     ASSERT(sheet);
     48 
     49     Document* sheetDocument = sheet->ownerDocument();
     50     if (!sheetDocument)
     51         return 0;
     52     Node* ownerNode = sheet->ownerNode();
     53     if (!ownerNode || !isHTMLStyleElement(ownerNode))
     54         return &document;
     55 
     56     HTMLStyleElement* styleElement = toHTMLStyleElement(ownerNode);
     57     if (!styleElement->scoped()) {
     58         if (styleElement->isInShadowTree())
     59             return styleElement->containingShadowRoot();
     60         return &document;
     61     }
     62 
     63     ContainerNode* parent = styleElement->parentNode();
     64     if (!parent)
     65         return 0;
     66 
     67     return (parent->isElementNode() || parent->isShadowRoot()) ? parent : 0;
     68 }
     69 
     70 void ScopedStyleResolver::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, StyleResolver* resolver)
     71 {
     72     m_authorStyleSheets.append(sheet);
     73 
     74     AddRuleFlags addRuleFlags = resolver->document().securityOrigin()->canRequest(sheet->baseURL()) ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState;
     75     const RuleSet& ruleSet = sheet->ensureRuleSet(medium, addRuleFlags);
     76     resolver->addMediaQueryResults(ruleSet.viewportDependentMediaQueryResults());
     77     resolver->processScopedRules(ruleSet, sheet->baseURL(), &m_scopingNode);
     78 }
     79 
     80 void ScopedStyleResolver::collectFeaturesTo(RuleFeatureSet& features)
     81 {
     82     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i)
     83         features.add(m_authorStyleSheets[i]->ruleSet().features());
     84 }
     85 
     86 void ScopedStyleResolver::resetAuthorStyle()
     87 {
     88     m_authorStyleSheets.clear();
     89     m_keyframesRuleMap.clear();
     90 }
     91 
     92 bool ScopedStyleResolver::checkRegionStyle(Element* regionElement)
     93 {
     94     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) {
     95         const RuleSet& ruleSet = m_authorStyleSheets[i]->ruleSet();
     96         for (unsigned i = 0; i < ruleSet.m_regionSelectorsAndRuleSets.size(); ++i) {
     97             ASSERT(ruleSet.m_regionSelectorsAndRuleSets.at(i).ruleSet.get());
     98             if (checkRegionSelector(ruleSet.m_regionSelectorsAndRuleSets.at(i).selector, regionElement))
     99                 return true;
    100         }
    101     }
    102     return false;
    103 }
    104 
    105 const StyleRuleKeyframes* ScopedStyleResolver::keyframeStylesForAnimation(const StringImpl* animationName)
    106 {
    107     if (m_keyframesRuleMap.isEmpty())
    108         return 0;
    109 
    110     KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(animationName);
    111     if (it == m_keyframesRuleMap.end())
    112         return 0;
    113 
    114     return it->value.get();
    115 }
    116 
    117 void ScopedStyleResolver::addKeyframeStyle(PassRefPtr<StyleRuleKeyframes> rule)
    118 {
    119     AtomicString s(rule->name());
    120     if (rule->isVendorPrefixed()) {
    121         KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(rule->name().impl());
    122         if (it == m_keyframesRuleMap.end())
    123             m_keyframesRuleMap.set(s.impl(), rule);
    124         else if (it->value->isVendorPrefixed())
    125             m_keyframesRuleMap.set(s.impl(), rule);
    126     } else {
    127         m_keyframesRuleMap.set(s.impl(), rule);
    128     }
    129 }
    130 
    131 void ScopedStyleResolver::collectMatchingAuthorRules(ElementRuleCollector& collector, bool includeEmptyRules, bool applyAuthorStyles, CascadeScope cascadeScope, CascadeOrder cascadeOrder)
    132 {
    133     const ContainerNode* scopingNode = &m_scopingNode;
    134     unsigned behaviorAtBoundary = SelectorChecker::DoesNotCrossBoundary;
    135 
    136     if (!applyAuthorStyles)
    137         behaviorAtBoundary |= SelectorChecker::ScopeContainsLastMatchedElement;
    138 
    139     if (m_scopingNode.isShadowRoot()) {
    140         scopingNode = toShadowRoot(m_scopingNode).host();
    141         behaviorAtBoundary |= SelectorChecker::ScopeIsShadowHost;
    142     }
    143 
    144     RuleRange ruleRange = collector.matchedResult().ranges.authorRuleRange();
    145     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) {
    146         MatchRequest matchRequest(&m_authorStyleSheets[i]->ruleSet(), includeEmptyRules, scopingNode, applyAuthorStyles, i);
    147         collector.collectMatchingRules(matchRequest, ruleRange, static_cast<SelectorChecker::BehaviorAtBoundary>(behaviorAtBoundary), cascadeScope, cascadeOrder);
    148         collector.collectMatchingRulesForRegion(matchRequest, ruleRange, static_cast<SelectorChecker::BehaviorAtBoundary>(behaviorAtBoundary), cascadeScope, cascadeOrder);
    149     }
    150 }
    151 
    152 void ScopedStyleResolver::matchPageRules(PageRuleCollector& collector)
    153 {
    154     // Only consider the global author RuleSet for @page rules, as per the HTML5 spec.
    155     ASSERT(m_scopingNode.isDocumentNode());
    156     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i)
    157         collector.matchPageRules(&m_authorStyleSheets[i]->ruleSet());
    158 }
    159 
    160 void ScopedStyleResolver::collectViewportRulesTo(StyleResolver* resolver) const
    161 {
    162     if (!m_scopingNode.isDocumentNode())
    163         return;
    164     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i)
    165         resolver->viewportStyleResolver()->collectViewportRules(&m_authorStyleSheets[i]->ruleSet(), ViewportStyleResolver::AuthorOrigin);
    166 }
    167 
    168 } // namespace WebCore
    169