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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/RefCounted.h"
#include "wtf/RefPtr.h"
#include "wtf/Vector.h"
namespace blink {
class CSSStyleSheet;
class CSSRuleList;
class RuleData;
class RuleSet;
class SelectorFilter;
class StaticCSSRuleList;
class StyleRuleUsageTracker;
// TODO(kochi): CascadeOrder is used only for Shadow DOM V0 bug-compatible
// cascading order. Once Shadow DOM V0 implementation is gone, remove this
// completely.
using CascadeOrder = unsigned;
const CascadeOrder ignoreCascadeOrder = 0;
class MatchedRule {
DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
public:
MatchedRule(const RuleData* ruleData,
unsigned specificity,
CascadeOrder cascadeOrder,
unsigned styleSheetIndex,
const CSSStyleSheet* parentStyleSheet)
: m_ruleData(ruleData),
m_specificity(specificity),
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; }
uint64_t position() const { return m_position; }
unsigned specificity() const {
return ruleData()->specificity() + m_specificity;
}
const CSSStyleSheet* parentStyleSheet() const { return m_parentStyleSheet; }
DEFINE_INLINE_TRACE() { visitor->trace(m_parentStyleSheet); }
private:
// TODO(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;
uint64_t m_position;
Member<const CSSStyleSheet> m_parentStyleSheet;
};
} // namespace blink
WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::MatchedRule);
namespace blink {
using StyleRuleList = HeapVector<Member<StyleRule>>;
// 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 ComputedStyle but should not!
class ElementRuleCollector {
STACK_ALLOCATED();
WTF_MAKE_NONCOPYABLE(ElementRuleCollector);
public:
ElementRuleCollector(const ElementResolveContext&,
const SelectorFilter&,
ComputedStyle* = 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;
}
bool hasAnyMatchingRules(RuleSet*);
const MatchResult& matchedResult() const;
StyleRuleList* matchedStyleRuleList();
CSSRuleList* matchedCSSRuleList();
void collectMatchingRules(const MatchRequest&,
CascadeOrder = ignoreCascadeOrder,
bool matchingTreeBoundaryRules = false);
void collectMatchingShadowHostRules(const MatchRequest&,
CascadeOrder = ignoreCascadeOrder);
void sortAndTransferMatchedRules();
void clearMatchedRules();
void addElementStyleProperties(const StylePropertySet*,
bool isCacheable = true);
void finishAddingUARules() { m_result.finishAddingUARules(); }
void finishAddingAuthorRulesForTreeScope() {
m_result.finishAddingAuthorRulesForTreeScope();
}
void setIncludeEmptyRules(bool include) { m_includeEmptyRules = include; }
bool includeEmptyRules() const { return m_includeEmptyRules; }
bool isCollectingForPseudoElement() const {
return m_pseudoStyleRequest.pseudoId != PseudoIdNone;
}
void addMatchedRulesToTracker(StyleRuleUsageTracker*) const;
private:
template <typename RuleDataListType>
void collectMatchingRulesForList(const RuleDataListType*,
CascadeOrder,
const MatchRequest&);
void didMatchRule(const RuleData&,
const SelectorChecker::MatchResult&,
CascadeOrder,
const MatchRequest&);
template <class CSSRuleCollection>
CSSRule* findStyleRule(CSSRuleCollection*, StyleRule*);
void appendCSSOMWrapperForRule(CSSStyleSheet*, StyleRule*);
void sortMatchedRules();
StaticCSSRuleList* ensureRuleList();
StyleRuleList* ensureStyleRuleList();
private:
const ElementResolveContext& m_context;
const SelectorFilter& m_selectorFilter;
RefPtr<ComputedStyle> 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_includeEmptyRules;
HeapVector<MatchedRule, 32> m_matchedRules;
// Output.
Member<StaticCSSRuleList> m_cssRuleList;
Member<StyleRuleList> m_styleRuleList;
MatchResult m_result;
};
} // namespace blink
#endif // ElementRuleCollector_h
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