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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 "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