| /* |
| * 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) 2005-2012, 2014 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. |
| * Copyright (C) 2012 Google 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. |
| */ |
| |
| #include "config.h" |
| #include "RuleFeature.h" |
| |
| #include "CSSSelector.h" |
| #include "CSSSelectorList.h" |
| #include "RuleSet.h" |
| |
| namespace WebCore { |
| |
| static bool isSiblingOrSubject(MatchElement matchElement) |
| { |
| switch (matchElement) { |
| case MatchElement::Subject: |
| case MatchElement::IndirectSibling: |
| case MatchElement::DirectSibling: |
| case MatchElement::AnySibling: |
| case MatchElement::Host: |
| return true; |
| case MatchElement::Parent: |
| case MatchElement::Ancestor: |
| case MatchElement::ParentSibling: |
| case MatchElement::AncestorSibling: |
| return false; |
| } |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| MatchElement RuleFeatureSet::computeNextMatchElement(MatchElement matchElement, CSSSelector::RelationType relation) |
| { |
| if (isSiblingOrSubject(matchElement)) { |
| switch (relation) { |
| case CSSSelector::Subselector: |
| return matchElement; |
| case CSSSelector::DescendantSpace: |
| return MatchElement::Ancestor; |
| case CSSSelector::Child: |
| return MatchElement::Parent; |
| case CSSSelector::IndirectAdjacent: |
| if (matchElement == MatchElement::AnySibling) |
| return MatchElement::AnySibling; |
| return MatchElement::IndirectSibling; |
| case CSSSelector::DirectAdjacent: |
| if (matchElement == MatchElement::AnySibling) |
| return MatchElement::AnySibling; |
| return matchElement == MatchElement::Subject ? MatchElement::DirectSibling : MatchElement::IndirectSibling; |
| case CSSSelector::ShadowDescendant: |
| return MatchElement::Host; |
| }; |
| } |
| switch (relation) { |
| case CSSSelector::Subselector: |
| return matchElement; |
| case CSSSelector::DescendantSpace: |
| case CSSSelector::Child: |
| return MatchElement::Ancestor; |
| case CSSSelector::IndirectAdjacent: |
| case CSSSelector::DirectAdjacent: |
| return matchElement == MatchElement::Parent ? MatchElement::ParentSibling : MatchElement::AncestorSibling; |
| case CSSSelector::ShadowDescendant: |
| return MatchElement::Host; |
| }; |
| ASSERT_NOT_REACHED(); |
| return matchElement; |
| }; |
| |
| MatchElement RuleFeatureSet::computeSubSelectorMatchElement(MatchElement matchElement, const CSSSelector& selector) |
| { |
| ASSERT(selector.selectorList()); |
| |
| if (selector.match() == CSSSelector::PseudoClass) { |
| auto type = selector.pseudoClassType(); |
| // For :nth-child(n of .some-subselector) where an element change may affect other elements similar to sibling combinators. |
| if (type == CSSSelector::PseudoClassNthChild || type == CSSSelector::PseudoClassNthLastChild) |
| return MatchElement::AnySibling; |
| |
| // Similarly for :host(). |
| if (type == CSSSelector::PseudoClassHost) |
| return MatchElement::Host; |
| } |
| if (selector.match() == CSSSelector::PseudoElement) { |
| // Similarly for ::slotted(). |
| if (selector.pseudoElementType() == CSSSelector::PseudoElementSlotted) |
| return MatchElement::Host; |
| } |
| |
| return matchElement; |
| }; |
| |
| void RuleFeatureSet::recursivelyCollectFeaturesFromSelector(SelectorFeatures& selectorFeatures, const CSSSelector& firstSelector, MatchElement matchElement) |
| { |
| const CSSSelector* selector = &firstSelector; |
| do { |
| if (selector->match() == CSSSelector::Id) { |
| idsInRules.add(selector->value()); |
| if (matchElement == MatchElement::Parent || matchElement == MatchElement::Ancestor) |
| idsMatchingAncestorsInRules.add(selector->value()); |
| } else if (selector->match() == CSSSelector::Class) |
| selectorFeatures.classes.append(std::make_pair(selector->value(), matchElement)); |
| else if (selector->isAttributeSelector()) { |
| auto& canonicalLocalName = selector->attributeCanonicalLocalName(); |
| auto& localName = selector->attribute().localName(); |
| attributeCanonicalLocalNamesInRules.add(canonicalLocalName); |
| attributeLocalNamesInRules.add(localName); |
| selectorFeatures.attributes.append(std::make_pair(selector, matchElement)); |
| } else if (selector->match() == CSSSelector::PseudoElement) { |
| switch (selector->pseudoElementType()) { |
| case CSSSelector::PseudoElementFirstLine: |
| usesFirstLineRules = true; |
| break; |
| case CSSSelector::PseudoElementFirstLetter: |
| usesFirstLetterRules = true; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| if (!selectorFeatures.hasSiblingSelector && selector->isSiblingSelector()) |
| selectorFeatures.hasSiblingSelector = true; |
| |
| if (const CSSSelectorList* selectorList = selector->selectorList()) { |
| auto subSelectorMatchElement = computeSubSelectorMatchElement(matchElement, *selector); |
| |
| for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) { |
| if (!selectorFeatures.hasSiblingSelector && selector->isSiblingSelector()) |
| selectorFeatures.hasSiblingSelector = true; |
| recursivelyCollectFeaturesFromSelector(selectorFeatures, *subSelector, subSelectorMatchElement); |
| } |
| } |
| |
| matchElement = computeNextMatchElement(matchElement, selector->relation()); |
| |
| selector = selector->tagHistory(); |
| } while (selector); |
| } |
| |
| void RuleFeatureSet::collectFeatures(const RuleData& ruleData) |
| { |
| SelectorFeatures selectorFeatures; |
| recursivelyCollectFeaturesFromSelector(selectorFeatures, *ruleData.selector()); |
| if (selectorFeatures.hasSiblingSelector) |
| siblingRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.selectorListIndex())); |
| if (ruleData.containsUncommonAttributeSelector()) |
| uncommonAttributeRules.append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.selectorListIndex())); |
| |
| for (auto& nameAndMatch : selectorFeatures.classes) { |
| classRules.ensure(nameAndMatch.first, [] { |
| return makeUnique<Vector<RuleFeature>>(); |
| }).iterator->value->append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.selectorListIndex(), nameAndMatch.second)); |
| if (nameAndMatch.second == MatchElement::Host) |
| classesAffectingHost.add(nameAndMatch.first); |
| } |
| for (auto& selectorAndMatch : selectorFeatures.attributes) { |
| auto* selector = selectorAndMatch.first; |
| auto matchElement = selectorAndMatch.second; |
| attributeRules.ensure(selector->attribute().localName().convertToASCIILowercase(), [] { |
| return makeUnique<Vector<RuleFeature>>(); |
| }).iterator->value->append(RuleFeature(ruleData.rule(), ruleData.selectorIndex(), ruleData.selectorListIndex(), matchElement, selector)); |
| if (matchElement == MatchElement::Host) |
| attributesAffectingHost.add(selector->attribute().localName().convertToASCIILowercase()); |
| } |
| } |
| |
| void RuleFeatureSet::add(const RuleFeatureSet& other) |
| { |
| idsInRules.add(other.idsInRules.begin(), other.idsInRules.end()); |
| idsMatchingAncestorsInRules.add(other.idsMatchingAncestorsInRules.begin(), other.idsMatchingAncestorsInRules.end()); |
| attributeCanonicalLocalNamesInRules.add(other.attributeCanonicalLocalNamesInRules.begin(), other.attributeCanonicalLocalNamesInRules.end()); |
| attributeLocalNamesInRules.add(other.attributeLocalNamesInRules.begin(), other.attributeLocalNamesInRules.end()); |
| contentAttributeNamesInRules.add(other.contentAttributeNamesInRules.begin(), other.contentAttributeNamesInRules.end()); |
| siblingRules.appendVector(other.siblingRules); |
| uncommonAttributeRules.appendVector(other.uncommonAttributeRules); |
| for (auto& keyValuePair : other.classRules) { |
| classRules.ensure(keyValuePair.key, [] { |
| return makeUnique<Vector<RuleFeature>>(); |
| }).iterator->value->appendVector(*keyValuePair.value); |
| } |
| classesAffectingHost.add(other.classesAffectingHost.begin(), other.classesAffectingHost.end()); |
| |
| for (auto& keyValuePair : other.attributeRules) { |
| attributeRules.ensure(keyValuePair.key, [] { |
| return makeUnique<Vector<RuleFeature>>(); |
| }).iterator->value->appendVector(*keyValuePair.value); |
| } |
| attributesAffectingHost.add(other.attributesAffectingHost.begin(), other.attributesAffectingHost.end()); |
| |
| usesFirstLineRules = usesFirstLineRules || other.usesFirstLineRules; |
| usesFirstLetterRules = usesFirstLetterRules || other.usesFirstLetterRules; |
| } |
| |
| void RuleFeatureSet::registerContentAttribute(const AtomString& attributeName) |
| { |
| contentAttributeNamesInRules.add(attributeName.convertToASCIILowercase()); |
| attributeCanonicalLocalNamesInRules.add(attributeName); |
| attributeLocalNamesInRules.add(attributeName); |
| } |
| |
| void RuleFeatureSet::clear() |
| { |
| idsInRules.clear(); |
| idsMatchingAncestorsInRules.clear(); |
| attributeCanonicalLocalNamesInRules.clear(); |
| attributeLocalNamesInRules.clear(); |
| contentAttributeNamesInRules.clear(); |
| siblingRules.clear(); |
| uncommonAttributeRules.clear(); |
| classRules.clear(); |
| classesAffectingHost.clear(); |
| attributeRules.clear(); |
| attributesAffectingHost.clear(); |
| usesFirstLineRules = false; |
| usesFirstLetterRules = false; |
| } |
| |
| void RuleFeatureSet::shrinkToFit() |
| { |
| siblingRules.shrinkToFit(); |
| uncommonAttributeRules.shrinkToFit(); |
| for (auto& rules : classRules.values()) |
| rules->shrinkToFit(); |
| for (auto& rules : attributeRules.values()) |
| rules->shrinkToFit(); |
| } |
| |
| } // namespace WebCore |
