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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003-2014 Apple Inc. 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.
*
*/
#pragma once
#include "RuleFeature.h"
#include "SelectorCompiler.h"
#include "SelectorFilter.h"
#include "StyleRule.h"
#include <wtf/Forward.h>
#include <wtf/HashMap.h>
#include <wtf/text/AtomicString.h>
#include <wtf/text/AtomicStringHash.h>
namespace WebCore {
enum PropertyWhitelistType {
PropertyWhitelistNone = 0,
PropertyWhitelistMarker,
#if ENABLE(VIDEO_TRACK)
PropertyWhitelistCue
#endif
};
class CSSSelector;
class ContainerNode;
class MediaQueryEvaluator;
class Node;
class StyleResolver;
class StyleSheetContents;
enum class MatchBasedOnRuleHash : unsigned {
None,
Universal,
ClassA,
ClassB,
ClassC
};
class RuleData {
public:
static const unsigned maximumSelectorComponentCount = 8192;
RuleData(StyleRule*, unsigned selectorIndex, unsigned selectorListIndex, unsigned position);
unsigned position() const { return m_position; }
StyleRule* rule() const { return m_rule.get(); }
const CSSSelector* selector() const { return m_rule->selectorList().selectorAt(m_selectorIndex); }
unsigned selectorIndex() const { return m_selectorIndex; }
unsigned selectorListIndex() const { return m_selectorListIndex; }
bool canMatchPseudoElement() const { return m_canMatchPseudoElement; }
MatchBasedOnRuleHash matchBasedOnRuleHash() const { return static_cast<MatchBasedOnRuleHash>(m_matchBasedOnRuleHash); }
bool containsUncommonAttributeSelector() const { return m_containsUncommonAttributeSelector; }
unsigned linkMatchType() const { return m_linkMatchType; }
PropertyWhitelistType propertyWhitelistType() const { return static_cast<PropertyWhitelistType>(m_propertyWhitelistType); }
const SelectorFilter::Hashes& descendantSelectorIdentifierHashes() const { return m_descendantSelectorIdentifierHashes; }
void disableSelectorFiltering() { m_descendantSelectorIdentifierHashes[0] = 0; }
private:
RefPtr<StyleRule> m_rule;
unsigned m_selectorIndex : 16;
unsigned m_selectorListIndex : 16;
// This number was picked fairly arbitrarily. We can probably lower it if we need to.
// Some simple testing showed <100,000 RuleData's on large sites.
unsigned m_position : 18;
unsigned m_matchBasedOnRuleHash : 3;
unsigned m_canMatchPseudoElement : 1;
unsigned m_containsUncommonAttributeSelector : 1;
unsigned m_linkMatchType : 2; // SelectorChecker::LinkMatchMask
unsigned m_propertyWhitelistType : 2;
SelectorFilter::Hashes m_descendantSelectorIdentifierHashes;
};
struct SameSizeAsRuleData {
void* a;
unsigned b;
unsigned c;
unsigned d[4];
};
COMPILE_ASSERT(sizeof(RuleData) == sizeof(SameSizeAsRuleData), RuleData_should_stay_small);
class RuleSet {
WTF_MAKE_NONCOPYABLE(RuleSet); WTF_MAKE_FAST_ALLOCATED;
public:
struct RuleSetSelectorPair {
RuleSetSelectorPair(const CSSSelector* selector, std::unique_ptr<RuleSet> ruleSet) : selector(selector), ruleSet(WTFMove(ruleSet)) { }
RuleSetSelectorPair(const RuleSetSelectorPair& pair) : selector(pair.selector), ruleSet(const_cast<RuleSetSelectorPair*>(&pair)->ruleSet.release()) { }
const CSSSelector* selector;
std::unique_ptr<RuleSet> ruleSet;
};
RuleSet();
~RuleSet();
typedef Vector<RuleData, 1> RuleDataVector;
typedef HashMap<AtomicString, std::unique_ptr<RuleDataVector>> AtomRuleMap;
void addRulesFromSheet(StyleSheetContents&, const MediaQueryEvaluator&, StyleResolver* = 0);
void addStyleRule(StyleRule*);
void addRule(StyleRule*, unsigned selectorIndex, unsigned selectorListIndex);
void addPageRule(StyleRulePage*);
void addToRuleSet(const AtomicString& key, AtomRuleMap&, const RuleData&);
void shrinkToFit();
void disableAutoShrinkToFit() { m_autoShrinkToFitEnabled = false; }
const RuleFeatureSet& features() const { return m_features; }
const RuleDataVector* idRules(const AtomicString& key) const { return m_idRules.get(key); }
const RuleDataVector* classRules(const AtomicString& key) const { return m_classRules.get(key); }
const RuleDataVector* tagRules(const AtomicString& key, bool isHTMLName) const;
const RuleDataVector* shadowPseudoElementRules(const AtomicString& key) const { return m_shadowPseudoElementRules.get(key); }
const RuleDataVector* linkPseudoClassRules() const { return &m_linkPseudoClassRules; }
#if ENABLE(VIDEO_TRACK)
const RuleDataVector* cuePseudoRules() const { return &m_cuePseudoRules; }
#endif
const RuleDataVector& hostPseudoClassRules() const { return m_hostPseudoClassRules; }
const RuleDataVector& slottedPseudoElementRules() const { return m_slottedPseudoElementRules; }
const RuleDataVector* focusPseudoClassRules() const { return &m_focusPseudoClassRules; }
const RuleDataVector* universalRules() const { return &m_universalRules; }
const Vector<StyleRulePage*>& pageRules() const { return m_pageRules; }
unsigned ruleCount() const { return m_ruleCount; }
bool hasShadowPseudoElementRules() const;
bool hasHostPseudoClassRulesMatchingInShadowTree() const { return m_hasHostPseudoClassRulesMatchingInShadowTree; }
private:
void addChildRules(const Vector<RefPtr<StyleRuleBase>>&, const MediaQueryEvaluator& medium, StyleResolver*, bool isInitiatingElementInUserAgentShadowTree);
AtomRuleMap m_idRules;
AtomRuleMap m_classRules;
AtomRuleMap m_tagLocalNameRules;
AtomRuleMap m_tagLowercaseLocalNameRules;
AtomRuleMap m_shadowPseudoElementRules;
RuleDataVector m_linkPseudoClassRules;
#if ENABLE(VIDEO_TRACK)
RuleDataVector m_cuePseudoRules;
#endif
RuleDataVector m_hostPseudoClassRules;
RuleDataVector m_slottedPseudoElementRules;
RuleDataVector m_focusPseudoClassRules;
RuleDataVector m_universalRules;
Vector<StyleRulePage*> m_pageRules;
unsigned m_ruleCount { 0 };
bool m_hasHostPseudoClassRulesMatchingInShadowTree { false };
bool m_autoShrinkToFitEnabled { true };
RuleFeatureSet m_features;
};
inline const RuleSet::RuleDataVector* RuleSet::tagRules(const AtomicString& key, bool isHTMLName) const
{
const AtomRuleMap* tagRules;
if (isHTMLName)
tagRules = &m_tagLowercaseLocalNameRules;
else
tagRules = &m_tagLocalNameRules;
return tagRules->get(key);
}
} // namespace WebCore
namespace WTF {
// RuleData is simple enough that initializing to 0 and moving with memcpy will totally work.
template<> struct VectorTraits<WebCore::RuleData> : SimpleClassVectorTraits { };
} // namespace WTF