third_party/WebKit/Source/core/css/SelectorChecker.h

   1 /*
   2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   3  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
   4  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
   5  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. All rights reserved.
   6  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
   7  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
   8  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
   9  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  10  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  11  *
  12  * This library is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU Library General Public
  14  * License as published by the Free Software Foundation; either
  15  * version 2 of the License, or (at your option) any later version.
  16  *
  17  * This library is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public License
  23  * along with this library; see the file COPYING.LIB.  If not, write to
  24  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  25  * Boston, MA 02110-1301, USA.
  26  */
  27
  28 #ifndef SelectorChecker_h
  29 #define SelectorChecker_h
  30
  31 #include "core/css/CSSSelector.h"
  32 #include "core/dom/Element.h"
  33 #include "platform/scroll/ScrollTypes.h"
  34
  35 namespace blink {
  36
  37 class CSSSelector;
  38 class ContainerNode;
  39 class Element;
  40 class LayoutScrollbar;
  41 class ComputedStyle;
  42
  43 class SelectorChecker {
  44     WTF_MAKE_NONCOPYABLE(SelectorChecker);
  45     STACK_ALLOCATED();
  46 public:
  47     enum VisitedMatchType { VisitedMatchDisabled, VisitedMatchEnabled };
  48     enum Mode { ResolvingStyle = 0, CollectingStyleRules, CollectingCSSRules, QueryingRules, SharingRules };
  49
  50     explicit SelectorChecker(Mode);
  51
  52     struct SelectorCheckingContext {
  53         STACK_ALLOCATED();
  54     public:
  55         // Initial selector constructor
  56         SelectorCheckingContext(Element* element, VisitedMatchType visitedMatchType)
  57             : selector(nullptr)
  58             , element(element)
  59             , previousElement(nullptr)
  60             , scope(nullptr)
  61             , visitedMatchType(visitedMatchType)
  62             , pseudoId(NOPSEUDO)
  63             , elementStyle(nullptr)
  64             , scrollbar(nullptr)
  65             , scrollbarPart(NoPart)
  66             , isSubSelector(false)
  67             , inRightmostCompound(true)
  68             , hasScrollbarPseudo(false)
  69             , hasSelectionPseudo(false)
  70             , isUARule(false)
  71             , scopeContainsLastMatchedElement(false)
  72             , treatShadowHostAsNormalScope(false)
  73         {
  74         }
  75
  76         const CSSSelector* selector;
  77         RawPtrWillBeMember<Element> element;
  78         RawPtrWillBeMember<Element> previousElement;
  79         RawPtrWillBeMember<const ContainerNode> scope;
  80         VisitedMatchType visitedMatchType;
  81         PseudoId pseudoId;
  82         ComputedStyle* elementStyle;
  83         RawPtrWillBeMember<LayoutScrollbar> scrollbar;
  84         ScrollbarPart scrollbarPart;
  85         bool isSubSelector;
  86         bool inRightmostCompound;
  87         bool hasScrollbarPseudo;
  88         bool hasSelectionPseudo;
  89         bool isUARule;
  90         bool scopeContainsLastMatchedElement;
  91         bool treatShadowHostAsNormalScope;
  92     };
  93
  94     struct MatchResult {
  95         STACK_ALLOCATED();
  96         MatchResult()
  97             : dynamicPseudo(NOPSEUDO)
  98             , specificity(0) { }
  99
 100         PseudoId dynamicPseudo;
 101         unsigned specificity;
 102     };
 103
 104     bool match(const SelectorCheckingContext&, MatchResult&) const;
 105     bool match(const SelectorCheckingContext&) const;
 106
 107     static bool matchesFocusPseudoClass(const Element&);
 108
 109 private:
 110     bool checkOne(const SelectorCheckingContext&, MatchResult&) const;
 111
 112     enum Match { SelectorMatches, SelectorFailsLocally, SelectorFailsAllSiblings, SelectorFailsCompletely };
 113
 114     Match matchSelector(const SelectorCheckingContext&, MatchResult&) const;
 115     Match matchForSubSelector(const SelectorCheckingContext&, MatchResult&) const;
 116     Match matchForRelation(const SelectorCheckingContext&, MatchResult&) const;
 117     Match matchForShadowDistributed(const SelectorCheckingContext&, const Element&, MatchResult&) const;
 118     Match matchForPseudoShadow(const SelectorCheckingContext&, const ContainerNode*, MatchResult&) const;
 119     bool checkPseudoClass(const SelectorCheckingContext&, MatchResult&) const;
 120     bool checkPseudoElement(const SelectorCheckingContext&, MatchResult&) const;
 121     bool checkScrollbarPseudoClass(const SelectorCheckingContext&, MatchResult&) const;
 122     bool checkPseudoHost(const SelectorCheckingContext&, MatchResult&) const;
 123     bool checkPseudoNot(const SelectorCheckingContext&, MatchResult&) const;
 124
 125     Mode m_mode;
 126 };
 127
 128 }
 129
 130 #endif