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 "core/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 blink { 44 45 TreeScope* ScopedStyleResolver::treeScopeFor(Document& document, const CSSStyleSheet* sheet) 46 { 47 ASSERT(sheet); 48 49 if (!sheet->ownerDocument()) 50 return 0; 51 52 Node* ownerNode = sheet->ownerNode(); 53 if (!isHTMLStyleElement(ownerNode)) 54 return &document; 55 56 HTMLStyleElement& styleElement = toHTMLStyleElement(*ownerNode); 57 if (styleElement.isInShadowTree()) 58 return styleElement.containingShadowRoot(); 59 return &document; 60 } 61 62 ScopedStyleResolver* ScopedStyleResolver::parent() const 63 { 64 for (TreeScope* scope = treeScope().parentTreeScope(); scope; scope = scope->parentTreeScope()) { 65 if (ScopedStyleResolver* resolver = scope->scopedStyleResolver()) 66 return resolver; 67 } 68 return 0; 69 } 70 71 void ScopedStyleResolver::addRulesFromSheet(CSSStyleSheet* cssSheet, const MediaQueryEvaluator& medium, StyleResolver* resolver) 72 { 73 m_authorStyleSheets.append(cssSheet); 74 unsigned index = m_authorStyleSheets.size() - 1; 75 StyleSheetContents* sheet = cssSheet->contents(); 76 77 AddRuleFlags addRuleFlags = resolver->document().securityOrigin()->canRequest(sheet->baseURL()) ? RuleHasDocumentSecurityOrigin : RuleHasNoSpecialState; 78 const RuleSet& ruleSet = sheet->ensureRuleSet(medium, addRuleFlags); 79 resolver->addMediaQueryResults(ruleSet.viewportDependentMediaQueryResults()); 80 resolver->processScopedRules(ruleSet, cssSheet, index, treeScope().rootNode()); 81 } 82 83 void ScopedStyleResolver::collectFeaturesTo(RuleFeatureSet& features, HashSet<const StyleSheetContents*>& visitedSharedStyleSheetContents) const 84 { 85 for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) { 86 StyleSheetContents* contents = m_authorStyleSheets[i]->contents(); 87 if (contents->hasOneClient() || visitedSharedStyleSheetContents.add(contents).isNewEntry) 88 features.add(contents->ruleSet().features()); 89 } 90 } 91 92 void ScopedStyleResolver::resetAuthorStyle() 93 { 94 m_authorStyleSheets.clear(); 95 m_keyframesRuleMap.clear(); 96 } 97 98 const StyleRuleKeyframes* ScopedStyleResolver::keyframeStylesForAnimation(const StringImpl* animationName) 99 { 100 if (m_keyframesRuleMap.isEmpty()) 101 return 0; 102 103 KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(animationName); 104 if (it == m_keyframesRuleMap.end()) 105 return 0; 106 107 return it->value.get(); 108 } 109 110 void ScopedStyleResolver::addKeyframeStyle(PassRefPtrWillBeRawPtr<StyleRuleKeyframes> rule) 111 { 112 AtomicString s(rule->name()); 113 if (rule->isVendorPrefixed()) { 114 KeyframesRuleMap::iterator it = m_keyframesRuleMap.find(rule->name().impl()); 115 if (it == m_keyframesRuleMap.end()) 116 m_keyframesRuleMap.set(s.impl(), rule); 117 else if (it->value->isVendorPrefixed()) 118 m_keyframesRuleMap.set(s.impl(), rule); 119 } else { 120 m_keyframesRuleMap.set(s.impl(), rule); 121 } 122 } 123 124 void ScopedStyleResolver::collectMatchingAuthorRules(ElementRuleCollector& collector, bool includeEmptyRules, CascadeScope cascadeScope, CascadeOrder cascadeOrder) 125 { 126 unsigned contextFlags = SelectorChecker::DefaultBehavior; 127 128 // FIXME: This is always true now. 129 contextFlags |= SelectorChecker::ScopeContainsLastMatchedElement; 130 131 RuleRange ruleRange = collector.matchedResult().ranges.authorRuleRange(); 132 for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) { 133 MatchRequest matchRequest(&m_authorStyleSheets[i]->contents()->ruleSet(), includeEmptyRules, &m_scope->rootNode(), m_authorStyleSheets[i], i); 134 collector.collectMatchingRules(matchRequest, ruleRange, static_cast<SelectorChecker::ContextFlags>(contextFlags), cascadeScope, cascadeOrder); 135 } 136 } 137 138 void ScopedStyleResolver::matchPageRules(PageRuleCollector& collector) 139 { 140 // Only consider the global author RuleSet for @page rules, as per the HTML5 spec. 141 ASSERT(m_scope->rootNode().isDocumentNode()); 142 for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) 143 collector.matchPageRules(&m_authorStyleSheets[i]->contents()->ruleSet()); 144 } 145 146 void ScopedStyleResolver::collectViewportRulesTo(StyleResolver* resolver) const 147 { 148 if (!m_scope->rootNode().isDocumentNode()) 149 return; 150 for (size_t i = 0; i < m_authorStyleSheets.size(); ++i) 151 resolver->viewportStyleResolver()->collectViewportRules(&m_authorStyleSheets[i]->contents()->ruleSet(), ViewportStyleResolver::AuthorOrigin); 152 } 153 154 void ScopedStyleResolver::trace(Visitor* visitor) 155 { 156 #if ENABLE(OILPAN) 157 visitor->trace(m_scope); 158 visitor->trace(m_authorStyleSheets); 159 visitor->trace(m_keyframesRuleMap); 160 #endif 161 } 162 163 } // namespace blink 164