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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 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.
*
*/
#ifndef ElementRuleCollector_h
#define ElementRuleCollector_h
#include "core/css/PseudoStyleRequest.h"
#include "core/css/SelectorChecker.h"
#include "core/css/resolver/ElementResolveContext.h"
#include "core/css/resolver/MatchRequest.h"
#include "core/css/resolver/MatchResult.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
namespace blink {
class CSSStyleSheet;
class CSSRuleList;
class RuleData;
class RuleSet;
class SelectorFilter;
class StaticCSSRuleList;
typedef unsigned CascadeScope;
typedef unsigned CascadeOrder;
const CascadeScope ignoreCascadeScope = 0;
const CascadeOrder ignoreCascadeOrder = 0;
class MatchedRule {
ALLOW_ONLY_INLINE_ALLOCATION();
public:
MatchedRule(const RuleData* ruleData, unsigned specificity, CascadeScope cascadeScope, CascadeOrder cascadeOrder, unsigned styleSheetIndex, const CSSStyleSheet* parentStyleSheet)
: m_ruleData(ruleData)
, m_specificity(specificity)
, m_cascadeScope(cascadeScope)
, m_parentStyleSheet(parentStyleSheet)
{
ASSERT(m_ruleData);
static const unsigned BitsForPositionInRuleData = 18;
static const unsigned BitsForStyleSheetIndex = 32;
m_position = ((uint64_t)cascadeOrder << (BitsForStyleSheetIndex + BitsForPositionInRuleData)) + ((uint64_t)styleSheetIndex << BitsForPositionInRuleData)+ m_ruleData->position();
}
const RuleData* ruleData() const { return m_ruleData; }
uint32_t cascadeScope() const { return m_cascadeScope; }
uint64_t position() const { return m_position; }
unsigned specificity() const { return ruleData()->specificity() + m_specificity; }
const CSSStyleSheet* parentStyleSheet() const { return m_parentStyleSheet; }
void trace(Visitor* visitor)
{
visitor->trace(m_parentStyleSheet);
}
private:
// FIXME: Oilpan: RuleData is in the oilpan heap and this pointer
// really should be traced. However, RuleData objects are
// allocated inside larger TerminatedArray objects and we cannot
// trace a raw rule data pointer at this point.
const RuleData* m_ruleData;
unsigned m_specificity;
CascadeScope m_cascadeScope;
uint64_t m_position;
RawPtrWillBeMember<const CSSStyleSheet> m_parentStyleSheet;
};
} // namespace blink
WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::MatchedRule);
namespace blink {
// FIXME: oilpan: when transition types are gone this class can be replaced with HeapVector.
class StyleRuleList final : public RefCountedWillBeGarbageCollected<StyleRuleList> {
public:
static PassRefPtrWillBeRawPtr<StyleRuleList> create() { return adoptRefWillBeNoop(new StyleRuleList()); }
void trace(Visitor* visitor)
{
#if ENABLE(OILPAN)
visitor->trace(m_list);
#endif
}
WillBeHeapVector<RawPtrWillBeMember<StyleRule> > m_list;
};
// ElementRuleCollector is designed to be used as a stack object.
// Create one, ask what rules the ElementResolveContext matches
// and then let it go out of scope.
// FIXME: Currently it modifies the RenderStyle but should not!
class ElementRuleCollector {
STACK_ALLOCATED();
WTF_MAKE_NONCOPYABLE(ElementRuleCollector);
public:
ElementRuleCollector(const ElementResolveContext&, const SelectorFilter&, RenderStyle* = 0);
~ElementRuleCollector();
void setMode(SelectorChecker::Mode mode) { m_mode = mode; }
void setPseudoStyleRequest(const PseudoStyleRequest& request) { m_pseudoStyleRequest = request; }
void setSameOriginOnly(bool f) { m_sameOriginOnly = f; }
void setMatchingUARules(bool matchingUARules) { m_matchingUARules = matchingUARules; }
void setScopeContainsLastMatchedElement(bool scopeContainsLastMatchedElement) { m_scopeContainsLastMatchedElement = scopeContainsLastMatchedElement; }
bool scopeContainsLastMatchedElement() const { return m_scopeContainsLastMatchedElement; }
bool hasAnyMatchingRules(RuleSet*);
MatchResult& matchedResult();
PassRefPtrWillBeRawPtr<StyleRuleList> matchedStyleRuleList();
PassRefPtrWillBeRawPtr<CSSRuleList> matchedCSSRuleList();
void collectMatchingRules(const MatchRequest&, RuleRange&, CascadeScope = ignoreCascadeScope, CascadeOrder = ignoreCascadeOrder, bool matchingTreeBoundaryRules = false);
void collectMatchingShadowHostRules(const MatchRequest&, RuleRange&, CascadeScope = ignoreCascadeScope, CascadeOrder = ignoreCascadeOrder, bool matchingTreeBoundaryRules = false);
void sortAndTransferMatchedRules();
void clearMatchedRules();
void addElementStyleProperties(const StylePropertySet*, bool isCacheable = true);
private:
void collectRuleIfMatches(const RuleData&, CascadeScope, CascadeOrder, const MatchRequest&, RuleRange&);
template<typename RuleDataListType>
void collectMatchingRulesForList(const RuleDataListType* rules, CascadeScope cascadeScope, CascadeOrder cascadeOrder, const MatchRequest& matchRequest, RuleRange& ruleRange)
{
if (!rules)
return;
for (const auto& rule : *rules)
collectRuleIfMatches(rule, cascadeScope, cascadeOrder, matchRequest, ruleRange);
}
bool ruleMatches(const RuleData&, const ContainerNode* scope, SelectorChecker::MatchResult*);
CSSRuleList* nestedRuleList(CSSRule*);
template<class CSSRuleCollection>
CSSRule* findStyleRule(CSSRuleCollection*, StyleRule*);
void appendCSSOMWrapperForRule(CSSStyleSheet*, StyleRule*);
void sortMatchedRules();
void addMatchedRule(const RuleData*, unsigned specificity, CascadeScope, CascadeOrder, unsigned styleSheetIndex, const CSSStyleSheet* parentStyleSheet);
StaticCSSRuleList* ensureRuleList();
StyleRuleList* ensureStyleRuleList();
private:
const ElementResolveContext& m_context;
const SelectorFilter& m_selectorFilter;
RefPtr<RenderStyle> m_style; // FIXME: This can be mutated during matching!
PseudoStyleRequest m_pseudoStyleRequest;
SelectorChecker::Mode m_mode;
bool m_canUseFastReject;
bool m_sameOriginOnly;
bool m_matchingUARules;
bool m_scopeContainsLastMatchedElement;
WillBeHeapVector<MatchedRule, 32> m_matchedRules;
// Output.
RefPtrWillBeMember<StaticCSSRuleList> m_cssRuleList;
RefPtrWillBeMember<StyleRuleList> m_styleRuleList;
MatchResult m_result;
};
} // namespace blink
#endif // ElementRuleCollector_h
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