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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) 2005-2016 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 "CSSSelector.h"
#include "Element.h"
#include "SpaceSplitString.h"
#include <wtf/HashSet.h>
#include <wtf/Vector.h>
namespace WebCore {
class CSSSelector;
class Element;
class RenderScrollbar;
class RenderStyle;
class SelectorChecker {
WTF_MAKE_NONCOPYABLE(SelectorChecker);
enum class Match { SelectorMatches, SelectorFailsLocally, SelectorFailsAllSiblings, SelectorFailsCompletely };
enum class MatchType { VirtualPseudoElementOnly, Element };
struct MatchResult {
Match match;
MatchType matchType;
static MatchResult matches(MatchType matchType)
{
return { Match::SelectorMatches, matchType };
}
static MatchResult updateWithMatchType(MatchResult result, MatchType matchType)
{
if (matchType == MatchType::VirtualPseudoElementOnly)
result.matchType = MatchType::VirtualPseudoElementOnly;
return result;
}
static MatchResult fails(Match match)
{
return { match, MatchType::Element };
}
};
public:
enum class Mode : unsigned char {
ResolvingStyle = 0, CollectingRules, CollectingRulesIgnoringVirtualPseudoElements, QueryingRules
};
SelectorChecker(Document&);
struct StyleRelation {
enum Type {
AffectedByActive,
AffectedByDrag,
AffectedByEmpty,
AffectedByHover,
AffectedByPreviousSibling,
AffectsNextSibling,
ChildrenAffectedByBackwardPositionalRules,
ChildrenAffectedByFirstChildRules,
ChildrenAffectedByPropertyBasedBackwardPositionalRules,
ChildrenAffectedByLastChildRules,
FirstChild,
LastChild,
NthChildIndex,
Unique,
};
Element& element;
Type type;
unsigned value;
};
using StyleRelations = Vector<StyleRelation, 8>;
struct CheckingContext {
CheckingContext(SelectorChecker::Mode resolvingMode)
: resolvingMode(resolvingMode)
{ }
const SelectorChecker::Mode resolvingMode;
PseudoId pseudoId { NOPSEUDO };
RenderScrollbar* scrollbar { nullptr };
ScrollbarPart scrollbarPart { NoPart };
const ContainerNode* scope { nullptr };
// FIXME: It would be nicer to have a separate object for return values. This requires some more work in the selector compiler.
StyleRelations styleRelations;
PseudoIdSet pseudoIDSet;
};
bool match(const CSSSelector&, const Element&, CheckingContext&, unsigned& specificity) const;
static bool isCommonPseudoClassSelector(const CSSSelector*);
static bool matchesFocusPseudoClass(const Element&);
static bool attributeSelectorMatches(const Element&, const QualifiedName&, const AtomicString& attributeValue, const CSSSelector&);
enum LinkMatchMask { MatchDefault = 0, MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
static unsigned determineLinkMatchType(const CSSSelector*);
struct LocalContext;
private:
MatchResult matchRecursively(CheckingContext&, const LocalContext&, PseudoIdSet&, unsigned& specificity) const;
bool checkOne(CheckingContext&, const LocalContext&, PseudoIdSet&, MatchType&, unsigned& specificity) const;
bool matchSelectorList(CheckingContext&, const LocalContext&, const Element&, const CSSSelectorList&, unsigned& specificity) const;
bool checkScrollbarPseudoClass(const CheckingContext&, const Element&, const CSSSelector&) const;
bool m_strictParsing;
bool m_documentIsHTML;
};
inline bool SelectorChecker::isCommonPseudoClassSelector(const CSSSelector* selector)
{
if (selector->match() != CSSSelector::PseudoClass)
return false;
CSSSelector::PseudoClassType pseudoType = selector->pseudoClassType();
return pseudoType == CSSSelector::PseudoClassLink
|| pseudoType == CSSSelector::PseudoClassAnyLink
|| pseudoType == CSSSelector::PseudoClassAnyLinkDeprecated
|| pseudoType == CSSSelector::PseudoClassVisited
|| pseudoType == CSSSelector::PseudoClassFocus;
}
}
#endif
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