293 lines
10 KiB
C++
293 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:tabstop=2:expandtab:shiftwidth=2:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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* style rule processor for CSS style sheets, responsible for selector
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* matching and cascading
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*/
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#ifndef nsCSSRuleProcessor_h_
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#define nsCSSRuleProcessor_h_
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#include "mozilla/Attributes.h"
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#include "mozilla/EventStates.h"
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/RefCountType.h"
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#include "mozilla/SheetType.h"
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#include "mozilla/UniquePtr.h"
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#include "nsExpirationTracker.h"
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#include "nsIMediaList.h"
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#include "nsIStyleRuleProcessor.h"
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#include "nsRuleWalker.h"
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#include "nsTArray.h"
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struct CascadeEnumData;
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struct ElementDependentRuleProcessorData;
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struct nsCSSSelector;
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struct nsCSSSelectorList;
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struct nsFontFaceRuleContainer;
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struct RuleCascadeData;
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struct TreeMatchContext;
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class nsCSSKeyframesRule;
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class nsCSSPageRule;
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class nsCSSFontFeatureValuesRule;
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class nsCSSCounterStyleRule;
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namespace mozilla {
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class CSSStyleSheet;
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enum class CSSPseudoElementType : uint8_t;
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namespace css {
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class DocumentRule;
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} // namespace css
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} // namespace mozilla
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/**
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* The CSS style rule processor provides a mechanism for sibling style
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* sheets to combine their rule processing in order to allow proper
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* cascading to happen.
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*
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* CSS style rule processors keep a live reference on all style sheets
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* bound to them. The CSS style sheets keep a weak reference to all the
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* processors that they are bound to (many to many). The CSS style sheet
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* is told when the rule processor is going away (via DropRuleProcessor).
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*/
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class nsCSSRuleProcessor: public nsIStyleRuleProcessor {
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public:
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typedef nsTArray<RefPtr<mozilla::CSSStyleSheet>> sheet_array_type;
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// aScopeElement must be non-null iff aSheetType is
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// SheetType::ScopedDoc.
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// aPreviousCSSRuleProcessor is the rule processor (if any) that this
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// one is replacing.
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nsCSSRuleProcessor(const sheet_array_type& aSheets,
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mozilla::SheetType aSheetType,
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mozilla::dom::Element* aScopeElement,
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nsCSSRuleProcessor* aPreviousCSSRuleProcessor,
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bool aIsShared = false);
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nsCSSRuleProcessor(sheet_array_type&& aSheets,
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mozilla::SheetType aSheetType,
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mozilla::dom::Element* aScopeElement,
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nsCSSRuleProcessor* aPreviousCSSRuleProcessor,
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bool aIsShared = false);
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_CLASS(nsCSSRuleProcessor)
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public:
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nsresult ClearRuleCascades();
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static void Startup();
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static void Shutdown();
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static void FreeSystemMetrics();
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static bool HasSystemMetric(nsIAtom* aMetric);
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/*
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* Returns true if the given aElement matches one of the
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* selectors in aSelectorList. Note that this method will assume
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* the given aElement is not a relevant link. aSelectorList must not
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* include any pseudo-element selectors. aSelectorList is allowed
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* to be null; in this case false will be returned.
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*/
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static bool SelectorListMatches(mozilla::dom::Element* aElement,
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TreeMatchContext& aTreeMatchContext,
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nsCSSSelectorList* aSelectorList);
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/*
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* Helper to get the content state for a content node. This may be
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* slightly adjusted from IntrinsicState().
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*/
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static mozilla::EventStates GetContentState(
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mozilla::dom::Element* aElement,
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const TreeMatchContext& aTreeMatchContext);
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/*
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* Helper to get the content state for :visited handling for an element
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*/
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static mozilla::EventStates GetContentStateForVisitedHandling(
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mozilla::dom::Element* aElement,
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const TreeMatchContext& aTreeMatchContext,
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nsRuleWalker::VisitedHandlingType aVisitedHandling,
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bool aIsRelevantLink);
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/*
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* Helper to test whether a node is a link
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*/
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static bool IsLink(const mozilla::dom::Element* aElement);
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/**
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* Returns true if the given aElement matches aSelector.
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* Like nsCSSRuleProcessor.cpp's SelectorMatches (and unlike
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* SelectorMatchesTree), this does not check an entire selector list
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* separated by combinators.
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*
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* :visited and :link will match both visited and non-visited links,
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* as if aTreeMatchContext->mVisitedHandling were eLinksVisitedOrUnvisited.
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*
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* aSelector is restricted to not containing pseudo-elements.
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*/
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static bool RestrictedSelectorMatches(mozilla::dom::Element* aElement,
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nsCSSSelector* aSelector,
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TreeMatchContext& aTreeMatchContext);
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// nsIStyleRuleProcessor
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virtual void RulesMatching(ElementRuleProcessorData* aData) override;
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virtual void RulesMatching(PseudoElementRuleProcessorData* aData) override;
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virtual void RulesMatching(AnonBoxRuleProcessorData* aData) override;
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#ifdef MOZ_XUL
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virtual void RulesMatching(XULTreeRuleProcessorData* aData) override;
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#endif
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virtual nsRestyleHint HasStateDependentStyle(StateRuleProcessorData* aData) override;
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virtual nsRestyleHint HasStateDependentStyle(PseudoElementStateRuleProcessorData* aData) override;
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virtual bool HasDocumentStateDependentStyle(StateRuleProcessorData* aData) override;
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virtual nsRestyleHint
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HasAttributeDependentStyle(AttributeRuleProcessorData* aData,
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mozilla::RestyleHintData& aRestyleHintDataResult)
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override;
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virtual bool MediumFeaturesChanged(nsPresContext* aPresContext) override;
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/**
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* If this rule processor currently has a substantive media query
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* result cache key, return a copy of it.
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*/
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mozilla::UniquePtr<nsMediaQueryResultCacheKey> CloneMQCacheKey();
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virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf)
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const MOZ_MUST_OVERRIDE override;
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virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf)
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const MOZ_MUST_OVERRIDE override;
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// Append all the currently-active font face rules to aArray. Return
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// true for success and false for failure.
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bool AppendFontFaceRules(nsPresContext* aPresContext,
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nsTArray<nsFontFaceRuleContainer>& aArray);
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nsCSSKeyframesRule* KeyframesRuleForName(nsPresContext* aPresContext,
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const nsString& aName);
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nsCSSCounterStyleRule* CounterStyleRuleForName(nsPresContext* aPresContext,
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const nsAString& aName);
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bool AppendPageRules(nsPresContext* aPresContext,
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nsTArray<nsCSSPageRule*>& aArray);
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bool AppendFontFeatureValuesRules(nsPresContext* aPresContext,
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nsTArray<nsCSSFontFeatureValuesRule*>& aArray);
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/**
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* Returns the scope element for the scoped style sheets this rule
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* processor is for. If this is not a rule processor for scoped style
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* sheets, it returns null.
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*/
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mozilla::dom::Element* GetScopeElement() const { return mScopeElement; }
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void TakeDocumentRulesAndCacheKey(
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nsPresContext* aPresContext,
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nsTArray<mozilla::css::DocumentRule*>& aDocumentRules,
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nsDocumentRuleResultCacheKey& aDocumentRuleResultCacheKey);
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bool IsShared() const { return mIsShared; }
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nsExpirationState* GetExpirationState() { return &mExpirationState; }
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void AddStyleSetRef();
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void ReleaseStyleSetRef();
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void SetInRuleProcessorCache(bool aVal) {
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MOZ_ASSERT(mIsShared);
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mInRuleProcessorCache = aVal;
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}
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bool IsInRuleProcessorCache() const { return mInRuleProcessorCache; }
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bool IsUsedByMultipleStyleSets() const { return mStyleSetRefCnt > 1; }
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#ifdef XP_WIN
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// Cached theme identifier for the moz-windows-theme media query.
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static uint8_t GetWindowsThemeIdentifier();
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static void SetWindowsThemeIdentifier(uint8_t aId) {
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sWinThemeId = aId;
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}
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#endif
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struct StateSelector {
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StateSelector(mozilla::EventStates aStates, nsCSSSelector* aSelector)
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: mStates(aStates),
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mSelector(aSelector)
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{}
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mozilla::EventStates mStates;
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nsCSSSelector* mSelector;
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};
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protected:
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virtual ~nsCSSRuleProcessor();
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private:
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static bool CascadeSheet(mozilla::CSSStyleSheet* aSheet,
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CascadeEnumData* aData);
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RuleCascadeData* GetRuleCascade(nsPresContext* aPresContext);
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void RefreshRuleCascade(nsPresContext* aPresContext);
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nsRestyleHint HasStateDependentStyle(ElementDependentRuleProcessorData* aData,
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mozilla::dom::Element* aStatefulElement,
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mozilla::CSSPseudoElementType aPseudoType,
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mozilla::EventStates aStateMask);
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void ClearSheets();
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// The sheet order here is the same as in nsStyleSet::mSheets
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sheet_array_type mSheets;
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// active first, then cached (most recent first)
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RuleCascadeData* mRuleCascades;
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// If we cleared our mRuleCascades or replaced a previous rule
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// processor, this is the media query result cache key that was used
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// before we lost the old rule cascades.
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mozilla::UniquePtr<nsMediaQueryResultCacheKey> mPreviousCacheKey;
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// The last pres context for which GetRuleCascades was called.
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nsPresContext *mLastPresContext;
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// The scope element for this rule processor's scoped style sheets.
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// Only used if mSheetType == nsStyleSet::eScopedDocSheet.
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RefPtr<mozilla::dom::Element> mScopeElement;
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nsTArray<mozilla::css::DocumentRule*> mDocumentRules;
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nsDocumentRuleResultCacheKey mDocumentCacheKey;
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nsExpirationState mExpirationState;
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MozRefCountType mStyleSetRefCnt;
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// type of stylesheet using this processor
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mozilla::SheetType mSheetType;
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const bool mIsShared;
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// Whether we need to build up mDocumentCacheKey and mDocumentRules as
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// we build a RuleCascadeData. Is true only for shared rule processors
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// and only before we build the first RuleCascadeData. See comment in
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// RefreshRuleCascade for why.
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bool mMustGatherDocumentRules;
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bool mInRuleProcessorCache;
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#ifdef DEBUG
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bool mDocumentRulesAndCacheKeyValid;
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#endif
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#ifdef XP_WIN
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static uint8_t sWinThemeId;
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#endif
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};
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#endif /* nsCSSRuleProcessor_h_ */
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