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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 blink {
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 };
SelectorChecker(Document&, Mode);
struct SelectorCheckingContext {
STACK_ALLOCATED();
public:
// Initial selector constructor
SelectorCheckingContext(const CSSSelector& selector, Element* element, VisitedMatchType visitedMatchType)
: selector(&selector)
, element(element)
, previousElement(nullptr)
, scope(nullptr)
, visitedMatchType(visitedMatchType)
, pseudoId(NOPSEUDO)
, elementStyle(0)
, scrollbar(nullptr)
, scrollbarPart(NoPart)
, isSubSelector(false)
, hasScrollbarPseudo(false)
, hasSelectionPseudo(false)
, isUARule(false)
, scopeContainsLastMatchedElement(false)
, treatShadowHostAsNormalScope(false)
{
}
const CSSSelector* selector;
RawPtrWillBeMember<Element> element;
RawPtrWillBeMember<Element> previousElement;
RawPtrWillBeMember<const ContainerNode> scope;
VisitedMatchType visitedMatchType;
PseudoId pseudoId;
RenderStyle* elementStyle;
RawPtrWillBeMember<RenderScrollbar> scrollbar;
ScrollbarPart scrollbarPart;
unsigned isSubSelector : 1;
unsigned hasScrollbarPseudo : 1;
unsigned hasSelectionPseudo : 1;
unsigned isUARule : 1;
unsigned scopeContainsLastMatchedElement : 1;
unsigned treatShadowHostAsNormalScope : 1;
};
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&);
static bool isCommonPseudoClassSelector(const CSSSelector&);
static bool matchesFocusPseudoClass(const Element&);
static bool matchesSpatialNavigationFocusPseudoClass(const Element&);
static bool matchesListBoxPseudoClass(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&, 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;
template<typename SiblingTraversalStrategy>
Match matchForPseudoShadow(const ContainerNode*, const SelectorCheckingContext&, const SiblingTraversalStrategy&, MatchResult*) const;
template<typename SiblingTraversalStrategy>
bool checkPseudoClass(const SelectorCheckingContext&, const SiblingTraversalStrategy&, unsigned* specificity) const;
template<typename SiblingTraversalStrategy>
bool checkPseudoElement(const SelectorCheckingContext&, const SiblingTraversalStrategy&) const;
bool checkScrollbarPseudoClass(const SelectorCheckingContext&, Document*, const CSSSelector&) const;
template<typename SiblingTraversalStrategy>
bool checkPseudoHost(const SelectorCheckingContext&, const SiblingTraversalStrategy&, unsigned*) const;
static bool isFrameFocused(const Element&);
bool m_strictParsing;
Mode m_mode;
};
inline bool SelectorChecker::isCommonPseudoClassSelector(const CSSSelector& selector)
{
if (selector.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)
{
if (tagQName == anyQName())
return true;
const AtomicString& localName = tagQName.localName();
if (localName != starAtom && localName != element.localName())
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)
{
for (const auto& attribute : element.attributesWithoutUpdate()) {
if (attribute.matches(selectorAttributeName) && (!value || attribute.value().impl() == value))
return true;
}
return false;
}
inline bool SelectorChecker::isHostInItsShadowTree(const Element& element, const ContainerNode* scope)
{
return scope && scope->isInShadowTree() && scope->shadowHost() == element;
}
}
#endif
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