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 "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