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-/*
- * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
- * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
- * Copyright (C) 2012 Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef StyleScopeResolver_h
-#define StyleScopeResolver_h
-
-#include <wtf/Assertions.h>
-#include <wtf/Forward.h>
-#include <wtf/HashMap.h>
-#include <wtf/OwnPtr.h>
-#include <wtf/Vector.h>
-
-namespace WebCore {
-
-class ContainerNode;
-class CSSStyleSheet;
-class Element;
-class RuleSet;
-class ShadowRoot;
-class StyleRuleHost;
-struct RuleFeatureSet;
-
-#if ENABLE(SHADOW_DOM)
-
-class StyleScopeResolver {
-public:
- typedef HashMap<const ContainerNode*, OwnPtr<RuleSet>> ScopedRuleSetMap;
-
- struct StackFrame {
- StackFrame() : m_scope(0), m_authorStyleBoundsIndex(0), m_ruleSet(0) { }
- StackFrame(const ContainerNode* scope, int authorStyleBoundsIndex, RuleSet* ruleSet)
- : m_scope(scope), m_authorStyleBoundsIndex(authorStyleBoundsIndex), m_ruleSet(ruleSet)
- { }
-
- const ContainerNode* m_scope;
- int m_authorStyleBoundsIndex;
- RuleSet* m_ruleSet;
- };
-
- StyleScopeResolver();
- ~StyleScopeResolver();
-
- static const ContainerNode* scopeFor(const CSSStyleSheet*);
-
- void push(const ContainerNode* scope, const ContainerNode* scopeParent);
- void pop(const ContainerNode* scope);
- bool hasScopedStyles() const { return !m_authorStyles.isEmpty(); }
- RuleSet* ensureRuleSetFor(const ContainerNode* scope);
- bool ensureStackConsistency(ContainerNode*);
- unsigned stackSize() const { return m_stack.size(); }
- const StackFrame& stackFrameAt(unsigned index) const { return m_stack.at(index); }
- bool matchesStyleBounds(const StackFrame& frame) const { return frame.m_authorStyleBoundsIndex == m_stackParentBoundsIndex; }
- void collectFeaturesTo(RuleFeatureSet&);
-
- void addHostRule(StyleRuleHost*, bool hasDocumentSecurityOrigin, const ContainerNode* scope);
- bool styleSharingCandidateMatchesHostRules(const Element*);
- void matchHostRules(const Element*, Vector<RuleSet*>& matchedRules);
-
-private:
- RuleSet* ruleSetFor(const ContainerNode* scope) const;
- void setupStack(const ContainerNode*);
- bool stackIsConsistent(const ContainerNode* parent) const { return parent && parent == m_stackParent; }
- RuleSet* ensureAtHostRuleSetFor(const ShadowRoot*);
- RuleSet* atHostRuleSetFor(const ShadowRoot*) const;
-
- ScopedRuleSetMap m_authorStyles;
-
- // Vector (used as stack) that keeps track of scoping elements (i.e., elements with a <style scoped> child)
- // encountered during tree iteration for style resolution.
- Vector<StackFrame> m_stack;
- // Element last seen as parent element when updating m_scopingElementStack.
- // This is used to decide whether m_scopingElementStack is consistent, separately from SelectorChecker::m_parentStack.
- const ContainerNode* m_stackParent;
- int m_stackParentBoundsIndex;
-
- ScopedRuleSetMap m_atHostRules;
-};
-
-inline bool StyleScopeResolver::ensureStackConsistency(ContainerNode* parent)
-{
- // Match scoped author rules by traversing the scoped element stack (rebuild it if it got inconsistent).
- if (!stackIsConsistent(parent))
- setupStack(parent);
- return !m_stack.isEmpty();
-}
-
-#else
-
-class StyleScopeResolver {
-public:
- static const ContainerNode* scopeFor(const CSSStyleSheet*) { return 0; }
- void push(const ContainerNode*, const ContainerNode*) { }
- void pop(const ContainerNode*) { }
- void collectFeaturesTo(RuleFeatureSet&) { }
- RuleSet* ensureRuleSetFor(const ContainerNode*) { return 0; }
-};
-
-#endif // ENABLE(SHADOW_DOM)
-
-} // namespace WebCore
-
-#endif // StyleScopeResolver_h