| /* |
| * 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 "base/macros.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 LayoutScrollbar; |
| class ComputedStyle; |
| |
| class SelectorChecker { |
| STACK_ALLOCATED(); |
| |
| public: |
| enum VisitedMatchType { kVisitedMatchDisabled, kVisitedMatchEnabled }; |
| |
| enum Mode { |
| // Used when matching selectors inside style recalc. This mode will set |
| // restyle flags across the tree during matching which impact how style |
| // sharing and invalidation work later. |
| kResolvingStyle, |
| |
| // Used when collecting which rules match into a StyleRuleList, the engine |
| // internal represention. |
| // |
| // TODO(esprehn): This doesn't change the behavior of the SelectorChecker |
| // we should merge it with a generic CollectingRules mode. |
| kCollectingStyleRules, |
| |
| // Used when collecting which rules match into a CSSRuleList, the CSSOM api |
| // represention. |
| // |
| // TODO(esprehn): This doesn't change the behavior of the SelectorChecker |
| // we should merge it with a generic CollectingRules mode. |
| kCollectingCSSRules, |
| |
| // Used when matching rules for querySelector and <content select>. This |
| // disables the special handling for positional selectors during parsing |
| // and also enables static profile only selectors like >>>. |
| kQueryingRules, |
| }; |
| |
| struct Init { |
| STACK_ALLOCATED(); |
| |
| public: |
| Mode mode = kResolvingStyle; |
| bool is_ua_rule = false; |
| ComputedStyle* element_style = nullptr; |
| Member<LayoutScrollbar> scrollbar = nullptr; |
| ScrollbarPart scrollbar_part = kNoPart; |
| }; |
| |
| explicit SelectorChecker(const Init& init) |
| : mode_(init.mode), |
| is_ua_rule_(init.is_ua_rule), |
| element_style_(init.element_style), |
| scrollbar_(init.scrollbar), |
| scrollbar_part_(init.scrollbar_part) {} |
| |
| struct SelectorCheckingContext { |
| STACK_ALLOCATED(); |
| |
| public: |
| // Initial selector constructor |
| SelectorCheckingContext(Element* element, |
| VisitedMatchType visited_match_type) |
| : selector(nullptr), |
| element(element), |
| previous_element(nullptr), |
| scope(nullptr), |
| visited_match_type(visited_match_type), |
| pseudo_id(kPseudoIdNone), |
| is_sub_selector(false), |
| in_rightmost_compound(true), |
| has_scrollbar_pseudo(false), |
| has_selection_pseudo(false), |
| treat_shadow_host_as_normal_scope(false) {} |
| |
| const CSSSelector* selector; |
| Member<Element> element; |
| Member<Element> previous_element; |
| Member<const ContainerNode> scope; |
| VisitedMatchType visited_match_type; |
| PseudoId pseudo_id; |
| bool is_sub_selector; |
| bool in_rightmost_compound; |
| bool has_scrollbar_pseudo; |
| bool has_selection_pseudo; |
| bool treat_shadow_host_as_normal_scope; |
| }; |
| |
| struct MatchResult { |
| STACK_ALLOCATED(); |
| MatchResult() : dynamic_pseudo(kPseudoIdNone), specificity(0) {} |
| |
| PseudoId dynamic_pseudo; |
| unsigned specificity; |
| }; |
| |
| bool Match(const SelectorCheckingContext& context, |
| MatchResult& result) const { |
| DCHECK(context.selector); |
| return MatchSelector(context, result) == kSelectorMatches; |
| } |
| |
| bool Match(const SelectorCheckingContext& context) const { |
| MatchResult ignore_result; |
| return Match(context, ignore_result); |
| } |
| |
| static bool MatchesFocusPseudoClass(const Element&); |
| static bool MatchesFocusVisiblePseudoClass(const Element&); |
| |
| private: |
| bool CheckOne(const SelectorCheckingContext&, MatchResult&) const; |
| |
| enum MatchStatus { |
| kSelectorMatches, |
| kSelectorFailsLocally, |
| kSelectorFailsAllSiblings, |
| kSelectorFailsCompletely |
| }; |
| |
| MatchStatus MatchSelector(const SelectorCheckingContext&, MatchResult&) const; |
| MatchStatus MatchForSubSelector(const SelectorCheckingContext&, |
| MatchResult&) const; |
| MatchStatus MatchForRelation(const SelectorCheckingContext&, |
| MatchResult&) const; |
| MatchStatus MatchForPseudoContent(const SelectorCheckingContext&, |
| const Element&, |
| MatchResult&) const; |
| MatchStatus MatchForPseudoShadow(const SelectorCheckingContext&, |
| const ContainerNode*, |
| MatchResult&) const; |
| bool CheckPseudoClass(const SelectorCheckingContext&, MatchResult&) const; |
| bool CheckPseudoElement(const SelectorCheckingContext&, MatchResult&) const; |
| bool CheckScrollbarPseudoClass(const SelectorCheckingContext&, |
| MatchResult&) const; |
| bool CheckPseudoHost(const SelectorCheckingContext&, MatchResult&) const; |
| bool CheckPseudoNot(const SelectorCheckingContext&, MatchResult&) const; |
| |
| Mode mode_; |
| bool is_ua_rule_; |
| ComputedStyle* element_style_; |
| Member<LayoutScrollbar> scrollbar_; |
| ScrollbarPart scrollbar_part_; |
| DISALLOW_COPY_AND_ASSIGN(SelectorChecker); |
| }; |
| |
| } // namespace blink |
| |
| #endif |