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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef SelectorChecker_h
#define SelectorChecker_h
#include "core/css/CSSSelector.h"
#include "core/dom/Element.h"
#include "platform/scroll/ScrollTypes.h"
namespace WebCore {
class CSSSelector;
class ContainerNode;
class Element;
class RenderScrollbar;
class RenderStyle;
class SelectorChecker {
WTF_MAKE_NONCOPYABLE(SelectorChecker);
public:
enum Match { SelectorMatches, SelectorFailsLocally, SelectorFailsAllSiblings, SelectorFailsCompletely };
enum VisitedMatchType { VisitedMatchDisabled, VisitedMatchEnabled };
enum Mode { ResolvingStyle = 0, CollectingStyleRules, CollectingCSSRules, QueryingRules, SharingRules };
explicit SelectorChecker(Document&, Mode);
enum BehaviorAtBoundary {
DoesNotCrossBoundary = 0,
CrossesBoundary = 1,
StaysWithinTreeScope = 2,
BoundaryBehaviorMask = 3, // 2bit for boundary behavior
ScopeContainsLastMatchedElement = 4,
ScopeIsShadowHost = 8,
TreatShadowHostAsNormalScope = 16,
ScopeIsShadowHostInPseudoHostParameter = CrossesBoundary | ScopeIsShadowHost | TreatShadowHostAsNormalScope
};
enum MatchingTagType {
MatchingElement = 0,
MatchingHostInItsShadowTree
};
struct SelectorCheckingContext {
// Initial selector constructor
SelectorCheckingContext(const CSSSelector* selector, Element* element, VisitedMatchType visitedMatchType)
: selector(selector)
, element(element)
, scope(0)
, visitedMatchType(visitedMatchType)
, pseudoId(NOPSEUDO)
, elementStyle(0)
, scrollbar(0)
, scrollbarPart(NoPart)
, isSubSelector(false)
, hasScrollbarPseudo(false)
, hasSelectionPseudo(false)
, behaviorAtBoundary(DoesNotCrossBoundary)
{ }
const CSSSelector* selector;
Element* element;
const ContainerNode* scope;
VisitedMatchType visitedMatchType;
PseudoId pseudoId;
RenderStyle* elementStyle;
RenderScrollbar* scrollbar;
ScrollbarPart scrollbarPart;
bool isSubSelector;
bool hasScrollbarPseudo;
bool hasSelectionPseudo;
BehaviorAtBoundary behaviorAtBoundary;
};
struct MatchResult {
MatchResult()
: dynamicPseudo(NOPSEUDO)
, specificity(0) { }
PseudoId dynamicPseudo;
unsigned specificity;
};
template<typename SiblingTraversalStrategy>
Match match(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult* = 0) const;
template<typename SiblingTraversalStrategy>
bool checkOne(const SelectorCheckingContext&, const SiblingTraversalStrategy&, unsigned* specificity = 0) const;
bool strictParsing() const { return m_strictParsing; }
Mode mode() const { return m_mode; }
static bool tagMatches(const Element&, const QualifiedName&, MatchingTagType = MatchingElement);
static bool isCommonPseudoClassSelector(const CSSSelector*);
static bool matchesFocusPseudoClass(const Element&);
static bool checkExactAttribute(const Element&, const QualifiedName& selectorAttributeName, const StringImpl* value);
enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
static unsigned determineLinkMatchType(const CSSSelector*);
static bool isHostInItsShadowTree(const Element&, BehaviorAtBoundary, const ContainerNode* scope);
private:
template<typename SiblingTraversalStrategy>
Match matchForSubSelector(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult*) const;
template<typename SiblingTraversalStrategy>
Match matchForRelation(const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult*) const;
template<typename SiblingTraversalStrategy>
Match matchForShadowDistributed(const Element*, const SiblingTraversalStrategy&, SelectorCheckingContext& nextContext, MatchResult* = 0) const;
bool checkScrollbarPseudoClass(const SelectorCheckingContext&, Document*, const CSSSelector*) const;
Element* parentElement(const SelectorCheckingContext&) const;
bool scopeContainsLastMatchedElement(const SelectorCheckingContext&) const;
static bool isFrameFocused(const Element&);
bool m_strictParsing;
bool m_documentIsHTML;
Mode m_mode;
};
inline bool SelectorChecker::isCommonPseudoClassSelector(const CSSSelector* selector)
{
if (selector->m_match != CSSSelector::PseudoClass)
return false;
CSSSelector::PseudoType pseudoType = selector->pseudoType();
return pseudoType == CSSSelector::PseudoLink
|| pseudoType == CSSSelector::PseudoAnyLink
|| pseudoType == CSSSelector::PseudoVisited
|| pseudoType == CSSSelector::PseudoFocus;
}
inline bool SelectorChecker::tagMatches(const Element& element, const QualifiedName& tagQName, MatchingTagType matchingTagType)
{
if (tagQName == anyQName())
return true;
const AtomicString& localName = tagQName.localName();
if (localName != starAtom && (localName != element.localName() || matchingTagType == MatchingHostInItsShadowTree))
return false;
const AtomicString& namespaceURI = tagQName.namespaceURI();
return namespaceURI == starAtom || namespaceURI == element.namespaceURI();
}
inline bool SelectorChecker::checkExactAttribute(const Element& element, const QualifiedName& selectorAttributeName, const StringImpl* value)
{
if (!element.hasAttributesWithoutUpdate())
return false;
unsigned size = element.attributeCount();
for (unsigned i = 0; i < size; ++i) {
const Attribute* attribute = element.attributeItem(i);
if (attribute->matches(selectorAttributeName) && (!value || attribute->value().impl() == value))
return true;
}
return false;
}
inline bool SelectorChecker::isHostInItsShadowTree(const Element& element, BehaviorAtBoundary behaviorAtBoundary, const ContainerNode* scope)
{
return (behaviorAtBoundary & (ScopeIsShadowHost | TreatShadowHostAsNormalScope)) == ScopeIsShadowHost && scope == element;
}
}
#endif
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