src/third_party/WebKit/Source/core/css/resolver/ScopedStyleTree.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/ScopedStyleTree.h"
  29
  30 #include "core/css/RuleFeature.h"
  31 #include "core/dom/Document.h"
  32 #include "core/dom/shadow/ElementShadow.h"
  33 #include "core/dom/shadow/ShadowRoot.h"
  34
  35 namespace WebCore {
  36
  37 ScopedStyleResolver* ScopedStyleTree::ensureScopedStyleResolver(ContainerNode& scopingNode)
  38 {
  39     bool isNewEntry;
  40     ScopedStyleResolver* scopedStyleResolver = addScopedStyleResolver(scopingNode, isNewEntry);
  41     if (isNewEntry)
  42         setupScopedStylesTree(scopedStyleResolver);
  43     return scopedStyleResolver;
  44 }
  45
  46 ScopedStyleResolver* ScopedStyleTree::scopedStyleResolverFor(const ContainerNode& scopingNode)
  47 {
  48     if (!scopingNode.hasScopedHTMLStyleChild()
  49         && !isShadowHost(&scopingNode)
  50         && !scopingNode.isDocumentNode()
  51         && !scopingNode.isShadowRoot())
  52         return 0;
  53     return lookupScopedStyleResolverFor(&scopingNode);
  54 }
  55
  56 ScopedStyleResolver* ScopedStyleTree::addScopedStyleResolver(ContainerNode& scopingNode, bool& isNewEntry)
  57 {
  58     HashMap<const ContainerNode*, OwnPtr<ScopedStyleResolver> >::AddResult addResult = m_authorStyles.add(&scopingNode, nullptr);
  59
  60     if (addResult.isNewEntry) {
  61         addResult.storedValue->value = ScopedStyleResolver::create(scopingNode);
  62         if (scopingNode.isDocumentNode())
  63             m_scopedResolverForDocument = addResult.storedValue->value.get();
  64     }
  65     isNewEntry = addResult.isNewEntry;
  66     return addResult.storedValue->value.get();
  67 }
  68
  69 void ScopedStyleTree::setupScopedStylesTree(ScopedStyleResolver* target)
  70 {
  71     ASSERT(target);
  72
  73     const ContainerNode& scopingNode = target->scopingNode();
  74
  75     // Since StyleResolver creates RuleSets according to styles' document
  76     // order, a parent of the given ScopedRuleData has been already
  77     // prepared.
  78     for (ContainerNode* node = scopingNode.parentOrShadowHostNode(); node; node = node->parentOrShadowHostNode()) {
  79         if (ScopedStyleResolver* scopedResolver = scopedStyleResolverFor(*node)) {
  80             target->setParent(scopedResolver);
  81             break;
  82         }
  83         if (node->isDocumentNode()) {
  84             bool dummy;
  85             ScopedStyleResolver* scopedResolver = addScopedStyleResolver(*node, dummy);
  86             target->setParent(scopedResolver);
  87             setupScopedStylesTree(scopedResolver);
  88             break;
  89         }
  90     }
  91
  92     if (m_buildInDocumentOrder)
  93         return;
  94
  95     // Reparent all nodes whose scoping node is contained by target's one.
  96     for (HashMap<const ContainerNode*, OwnPtr<ScopedStyleResolver> >::iterator it = m_authorStyles.begin(); it != m_authorStyles.end(); ++it) {
  97         if (it->value == target)
  98             continue;
  99         ASSERT(it->key->inDocument());
 100         if (it->value->parent() == target->parent() && scopingNode.containsIncludingShadowDOM(it->key))
 101             it->value->setParent(target);
 102     }
 103 }
 104
 105 void ScopedStyleTree::clear()
 106 {
 107     m_authorStyles.clear();
 108     m_scopedResolverForDocument = 0;
 109     m_cache.clear();
 110 }
 111
 112 void ScopedStyleTree::resolveScopedStyles(const Element* element, Vector<ScopedStyleResolver*, 8>& resolvers)
 113 {
 114     for (ScopedStyleResolver* scopedResolver = scopedResolverFor(element); scopedResolver; scopedResolver = scopedResolver->parent())
 115         resolvers.append(scopedResolver);
 116 }
 117
 118 void ScopedStyleTree::collectScopedResolversForHostedShadowTrees(const Element* element, Vector<ScopedStyleResolver*, 8>& resolvers)
 119 {
 120     ElementShadow* shadow = element->shadow();
 121     if (!shadow)
 122         return;
 123
 124     // Adding scoped resolver for active shadow roots for shadow host styling.
 125     for (ShadowRoot* shadowRoot = shadow->youngestShadowRoot(); shadowRoot; shadowRoot = shadowRoot->olderShadowRoot()) {
 126         if (shadowRoot->hasScopedHTMLStyleChild()) {
 127             if (ScopedStyleResolver* resolver = scopedStyleResolverFor(*shadowRoot))
 128                 resolvers.append(resolver);
 129         }
 130         if (!shadowRoot->containsShadowElements())
 131             break;
 132     }
 133 }
 134
 135 void ScopedStyleTree::resolveScopedKeyframesRules(const Element* element, Vector<ScopedStyleResolver*, 8>& resolvers)
 136 {
 137     Document& document = element->document();
 138     TreeScope& treeScope = element->treeScope();
 139     bool applyAuthorStyles = treeScope.applyAuthorStyles();
 140
 141     // Add resolvers for shadow roots hosted by the given element.
 142     collectScopedResolversForHostedShadowTrees(element, resolvers);
 143
 144     // Add resolvers while walking up DOM tree from the given element.
 145     for (ScopedStyleResolver* scopedResolver = scopedResolverFor(element); scopedResolver; scopedResolver = scopedResolver->parent()) {
 146         if (scopedResolver->treeScope() == treeScope || (applyAuthorStyles && scopedResolver->treeScope() == document))
 147             resolvers.append(scopedResolver);
 148     }
 149 }
 150
 151 inline ScopedStyleResolver* ScopedStyleTree::enclosingScopedStyleResolverFor(const ContainerNode* scopingNode)
 152 {
 153     for (; scopingNode; scopingNode = scopingNode->parentOrShadowHostNode()) {
 154         if (ScopedStyleResolver* scopedStyleResolver = scopedStyleResolverFor(*scopingNode))
 155             return scopedStyleResolver;
 156     }
 157     return 0;
 158 }
 159
 160 void ScopedStyleTree::resolveStyleCache(const ContainerNode* scopingNode)
 161 {
 162     m_cache.scopedResolver = enclosingScopedStyleResolverFor(scopingNode);
 163     m_cache.nodeForScopedStyles = scopingNode;
 164 }
 165
 166 void ScopedStyleTree::pushStyleCache(const ContainerNode& scopingNode, const ContainerNode* parent)
 167 {
 168     if (m_authorStyles.isEmpty())
 169         return;
 170
 171     if (!cacheIsValid(parent)) {
 172         resolveStyleCache(&scopingNode);
 173         return;
 174     }
 175
 176     ScopedStyleResolver* scopedResolver = scopedStyleResolverFor(scopingNode);
 177     if (scopedResolver)
 178         m_cache.scopedResolver = scopedResolver;
 179     m_cache.nodeForScopedStyles = &scopingNode;
 180 }
 181
 182 void ScopedStyleTree::popStyleCache(const ContainerNode& scopingNode)
 183 {
 184     if (!cacheIsValid(&scopingNode))
 185         return;
 186
 187     if (m_cache.scopedResolver && m_cache.scopedResolver->scopingNode() == scopingNode)
 188         m_cache.scopedResolver = m_cache.scopedResolver->parent();
 189     m_cache.nodeForScopedStyles = scopingNode.parentOrShadowHostNode();
 190 }
 191
 192 void ScopedStyleTree::collectFeaturesTo(RuleFeatureSet& features)
 193 {
 194     for (HashMap<const ContainerNode*, OwnPtr<ScopedStyleResolver> >::iterator it = m_authorStyles.begin(); it != m_authorStyles.end(); ++it)
 195         it->value->collectFeaturesTo(features);
 196 }
 197
 198 inline void ScopedStyleTree::reparentNodes(const ScopedStyleResolver* oldParent, ScopedStyleResolver* newParent)
 199 {
 200     // FIXME: this takes O(N) (N = number of all scoping nodes).
 201     for (HashMap<const ContainerNode*, OwnPtr<ScopedStyleResolver> >::iterator it = m_authorStyles.begin(); it != m_authorStyles.end(); ++it) {
 202         if (it->value->parent() == oldParent)
 203             it->value->setParent(newParent);
 204     }
 205 }
 206
 207 void ScopedStyleTree::remove(const ContainerNode* scopingNode)
 208 {
 209     if (!scopingNode || scopingNode->isDocumentNode())
 210         return;
 211
 212     ScopedStyleResolver* resolverRemoved = lookupScopedStyleResolverFor(scopingNode);
 213     if (!resolverRemoved)
 214         return;
 215
 216     reparentNodes(resolverRemoved, resolverRemoved->parent());
 217     if (m_cache.scopedResolver == resolverRemoved)
 218         m_cache.clear();
 219
 220     m_authorStyles.remove(scopingNode);
 221 }
 222
 223 } // namespace WebCore