src/third_party/WebKit/Source/core/css/resolver/ScopedStyleResolver.cpp

   1 /*
   2  * Copyright (C) 1999 Lars Knoll (knoll@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 || !ownerNode->hasTagName(HTMLNames::styleTag))
  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(CSSStyleSheet* cssSheet, const MediaQueryEvaluator& medium, StyleResolver* resolver)
  71 {
  72     m_authorStyleSheets.append(cssSheet);
  73     StyleSheetContents* sheet = cssSheet->contents();
  74
  75     AddRuleFlags addRuleFlags = resolver->document().securityOrigin()->canRequest(sheet->baseURL()) ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState;
  76     const RuleSet& ruleSet = sheet->ensureRuleSet(medium, addRuleFlags);
  77     resolver->addMediaQueryResults(ruleSet.viewportDependentMediaQueryResults());
  78     resolver->processScopedRules(ruleSet, sheet->baseURL(), &m_scopingNode);
  79 }
  80
  81 void ScopedStyleResolver::collectFeaturesTo(RuleFeatureSet& features)
  82 {
  83     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i)
  84         features.add(m_authorStyleSheets[i]->contents()->ruleSet().features());
  85 }
  86
  87 void ScopedStyleResolver::resetAuthorStyle()
  88 {
  89     m_authorStyleSheets.clear();
  90     m_keyframesRuleMap.clear();
  91 }
  92
  93 const StyleRuleKeyframes* ScopedStyleResolver::keyframeStylesForAnimation(const StringImpl* animationName)
  94 {
  95     if (m_keyframesRuleMap.isEmpty())
  96         return 0;
  97
  98     KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(animationName);
  99     if (it == m_keyframesRuleMap.end())
 100         return 0;
 101
 102     return it->value.get();
 103 }
 104
 105 void ScopedStyleResolver::addKeyframeStyle(PassRefPtr<StyleRuleKeyframes> rule)
 106 {
 107     AtomicString s(rule->name());
 108     if (rule->isVendorPrefixed()) {
 109         KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(rule->name().impl());
 110         if (it == m_keyframesRuleMap.end())
 111             m_keyframesRuleMap.set(s.impl(), rule);
 112         else if (it->value->isVendorPrefixed())
 113             m_keyframesRuleMap.set(s.impl(), rule);
 114     } else {
 115         m_keyframesRuleMap.set(s.impl(), rule);
 116     }
 117 }
 118
 119 void ScopedStyleResolver::collectMatchingAuthorRules(ElementRuleCollector& collector, bool includeEmptyRules, bool applyAuthorStyles, CascadeScope cascadeScope, CascadeOrder cascadeOrder)
 120 {
 121     const ContainerNode* scopingNode = &m_scopingNode;
 122     unsigned behaviorAtBoundary = SelectorChecker::DoesNotCrossBoundary;
 123
 124     if (!applyAuthorStyles)
 125         behaviorAtBoundary |= SelectorChecker::ScopeContainsLastMatchedElement;
 126
 127     if (m_scopingNode.isShadowRoot()) {
 128         scopingNode = toShadowRoot(m_scopingNode).host();
 129         behaviorAtBoundary |= SelectorChecker::ScopeIsShadowHost;
 130     }
 131
 132     RuleRange ruleRange = collector.matchedResult().ranges.authorRuleRange();
 133     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) {
 134         MatchRequest matchRequest(&m_authorStyleSheets[i]->contents()->ruleSet(), includeEmptyRules, scopingNode, applyAuthorStyles, i, m_authorStyleSheets[i]);
 135         collector.collectMatchingRules(matchRequest, ruleRange, static_cast<SelectorChecker::BehaviorAtBoundary>(behaviorAtBoundary), cascadeScope, cascadeOrder);
 136     }
 137 }
 138
 139 void ScopedStyleResolver::matchPageRules(PageRuleCollector& collector)
 140 {
 141     // Only consider the global author RuleSet for @page rules, as per the HTML5 spec.
 142     ASSERT(m_scopingNode.isDocumentNode());
 143     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i)
 144         collector.matchPageRules(&m_authorStyleSheets[i]->contents()->ruleSet());
 145 }
 146
 147 void ScopedStyleResolver::collectViewportRulesTo(StyleResolver* resolver) const
 148 {
 149     if (!m_scopingNode.isDocumentNode())
 150         return;
 151     for (size_t i = 0; i < m_authorStyleSheets.size(); ++i)
 152         resolver->viewportStyleResolver()->collectViewportRules(&m_authorStyleSheets[i]->contents()->ruleSet(), ViewportStyleResolver::AuthorOrigin);
 153 }
 154
 155 } // namespace WebCore