| /* |
| * 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, 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 "core/css/RuleSet.h" |
| |
| #include "core/css/CSSFontSelector.h" |
| #include "core/css/CSSSelector.h" |
| #include "core/css/CSSSelectorList.h" |
| #include "core/css/SelectorFilter.h" |
| #include "core/css/StyleRuleImport.h" |
| #include "core/css/StyleSheetContents.h" |
| #include "core/html/track/TextTrackCue.h" |
| #include "core/html_names.h" |
| #include "platform/heap/HeapTerminatedArrayBuilder.h" |
| #include "platform/instrumentation/tracing/TraceEvent.h" |
| #include "platform/weborigin/SecurityOrigin.h" |
| |
| #include "platform/wtf/TerminatedArrayBuilder.h" |
| |
| namespace blink { |
| |
| using namespace HTMLNames; |
| |
| static inline PropertyWhitelistType DeterminePropertyWhitelistType( |
| const AddRuleFlags add_rule_flags, |
| const CSSSelector& selector) { |
| for (const CSSSelector* component = &selector; component; |
| component = component->TagHistory()) { |
| if (component->GetPseudoType() == CSSSelector::kPseudoCue || |
| (component->Match() == CSSSelector::kPseudoElement && |
| component->Value() == TextTrackCue::CueShadowPseudoId())) |
| return kPropertyWhitelistCue; |
| if (component->GetPseudoType() == CSSSelector::kPseudoFirstLetter) |
| return kPropertyWhitelistFirstLetter; |
| } |
| return kPropertyWhitelistNone; |
| } |
| |
| RuleData::RuleData(StyleRule* rule, |
| unsigned selector_index, |
| unsigned position, |
| AddRuleFlags add_rule_flags) |
| : rule_(rule), |
| selector_index_(selector_index), |
| is_last_in_array_(false), |
| position_(position), |
| specificity_(Selector().Specificity()), |
| link_match_type_(Selector().ComputeLinkMatchType(CSSSelector::kMatchAll)), |
| has_document_security_origin_(add_rule_flags & |
| kRuleHasDocumentSecurityOrigin), |
| property_whitelist_( |
| DeterminePropertyWhitelistType(add_rule_flags, Selector())), |
| descendant_selector_identifier_hashes_() { |
| SelectorFilter::CollectIdentifierHashes( |
| Selector(), descendant_selector_identifier_hashes_, |
| kMaximumIdentifierCount); |
| } |
| |
| void RuleSet::AddToRuleSet(const AtomicString& key, |
| PendingRuleMap& map, |
| const RuleData& rule_data) { |
| Member<HeapLinkedStack<RuleData>>& rules = |
| map.insert(key, nullptr).stored_value->value; |
| if (!rules) |
| rules = new HeapLinkedStack<RuleData>; |
| rules->Push(rule_data); |
| } |
| |
| static void ExtractSelectorValues(const CSSSelector* selector, |
| AtomicString& id, |
| AtomicString& class_name, |
| AtomicString& custom_pseudo_element_name, |
| AtomicString& tag_name, |
| CSSSelector::PseudoType& pseudo_type) { |
| switch (selector->Match()) { |
| case CSSSelector::kId: |
| id = selector->Value(); |
| break; |
| case CSSSelector::kClass: |
| class_name = selector->Value(); |
| break; |
| case CSSSelector::kTag: |
| if (selector->TagQName().LocalName() != |
| CSSSelector::UniversalSelectorAtom()) |
| tag_name = selector->TagQName().LocalName(); |
| break; |
| case CSSSelector::kPseudoClass: |
| case CSSSelector::kPseudoElement: |
| case CSSSelector::kPagePseudoClass: |
| // Must match the cases in RuleSet::FindBestRuleSetAndAdd. |
| switch (selector->GetPseudoType()) { |
| case CSSSelector::kPseudoCue: |
| case CSSSelector::kPseudoLink: |
| case CSSSelector::kPseudoVisited: |
| case CSSSelector::kPseudoWebkitAnyLink: |
| case CSSSelector::kPseudoAnyLink: |
| case CSSSelector::kPseudoFocus: |
| case CSSSelector::kPseudoPlaceholder: |
| case CSSSelector::kPseudoHost: |
| case CSSSelector::kPseudoHostContext: |
| pseudo_type = selector->GetPseudoType(); |
| break; |
| case CSSSelector::kPseudoWebKitCustomElement: |
| case CSSSelector::kPseudoBlinkInternalElement: |
| custom_pseudo_element_name = selector->Value(); |
| break; |
| default: |
| break; |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| |
| bool RuleSet::FindBestRuleSetAndAdd(const CSSSelector& component, |
| RuleData& rule_data) { |
| AtomicString id; |
| AtomicString class_name; |
| AtomicString custom_pseudo_element_name; |
| AtomicString tag_name; |
| CSSSelector::PseudoType pseudo_type = CSSSelector::kPseudoUnknown; |
| |
| #ifndef NDEBUG |
| all_rules_.push_back(rule_data); |
| #endif |
| |
| const CSSSelector* it = &component; |
| for (; it && it->Relation() == CSSSelector::kSubSelector; |
| it = it->TagHistory()) { |
| ExtractSelectorValues(it, id, class_name, custom_pseudo_element_name, |
| tag_name, pseudo_type); |
| } |
| if (it) { |
| ExtractSelectorValues(it, id, class_name, custom_pseudo_element_name, |
| tag_name, pseudo_type); |
| } |
| |
| // Prefer rule sets in order of most likely to apply infrequently. |
| if (!id.IsEmpty()) { |
| AddToRuleSet(id, EnsurePendingRules()->id_rules, rule_data); |
| return true; |
| } |
| |
| if (!class_name.IsEmpty()) { |
| AddToRuleSet(class_name, EnsurePendingRules()->class_rules, rule_data); |
| return true; |
| } |
| |
| if (!custom_pseudo_element_name.IsEmpty()) { |
| // Custom pseudos come before ids and classes in the order of tagHistory, |
| // and have a relation of ShadowPseudo between them. Therefore we should |
| // never be a situation where ExtractSelectorValues finds id and |
| // className in addition to custom pseudo. |
| DCHECK(id.IsEmpty()); |
| DCHECK(class_name.IsEmpty()); |
| AddToRuleSet(custom_pseudo_element_name, |
| EnsurePendingRules()->shadow_pseudo_element_rules, rule_data); |
| return true; |
| } |
| |
| switch (pseudo_type) { |
| case CSSSelector::kPseudoCue: |
| cue_pseudo_rules_.push_back(rule_data); |
| return true; |
| case CSSSelector::kPseudoLink: |
| case CSSSelector::kPseudoVisited: |
| case CSSSelector::kPseudoAnyLink: |
| case CSSSelector::kPseudoWebkitAnyLink: |
| link_pseudo_class_rules_.push_back(rule_data); |
| return true; |
| case CSSSelector::kPseudoFocus: |
| focus_pseudo_class_rules_.push_back(rule_data); |
| return true; |
| case CSSSelector::kPseudoPlaceholder: |
| AddToRuleSet(AtomicString("-webkit-input-placeholder"), |
| EnsurePendingRules()->shadow_pseudo_element_rules, |
| rule_data); |
| return true; |
| case CSSSelector::kPseudoHost: |
| case CSSSelector::kPseudoHostContext: |
| shadow_host_rules_.push_back(rule_data); |
| return true; |
| case CSSSelector::kPseudoPart: |
| if (RuntimeEnabledFeatures::CSSPartPseudoElementEnabled()) { |
| part_pseudo_rules_.push_back(rule_data); |
| } |
| return true; |
| default: |
| break; |
| } |
| |
| if (!tag_name.IsEmpty()) { |
| AddToRuleSet(tag_name, EnsurePendingRules()->tag_rules, rule_data); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| void RuleSet::AddRule(StyleRule* rule, |
| unsigned selector_index, |
| AddRuleFlags add_rule_flags) { |
| // The selector index field in RuleData is only 13 bits so we can't support |
| // selectors at index 8192 or beyond. |
| // See https://crbug.com/804179 |
| if (selector_index >= 8192) |
| return; |
| RuleData rule_data(rule, selector_index, rule_count_++, add_rule_flags); |
| if (features_.CollectFeaturesFromRuleData(rule_data) == |
| RuleFeatureSet::kSelectorNeverMatches) |
| return; |
| |
| if (!FindBestRuleSetAndAdd(rule_data.Selector(), rule_data)) { |
| // If we didn't find a specialized map to stick it in, file under universal |
| // rules. |
| universal_rules_.push_back(rule_data); |
| } |
| } |
| |
| void RuleSet::AddPageRule(StyleRulePage* rule) { |
| EnsurePendingRules(); // So that page_rules_.ShrinkToFit() gets called. |
| page_rules_.push_back(rule); |
| } |
| |
| void RuleSet::AddFontFaceRule(StyleRuleFontFace* rule) { |
| EnsurePendingRules(); // So that font_face_rules_.ShrinkToFit() gets called. |
| font_face_rules_.push_back(rule); |
| } |
| |
| void RuleSet::AddKeyframesRule(StyleRuleKeyframes* rule) { |
| EnsurePendingRules(); // So that keyframes_rules_.ShrinkToFit() gets called. |
| keyframes_rules_.push_back(rule); |
| } |
| |
| void RuleSet::AddChildRules(const HeapVector<Member<StyleRuleBase>>& rules, |
| const MediaQueryEvaluator& medium, |
| AddRuleFlags add_rule_flags) { |
| for (unsigned i = 0; i < rules.size(); ++i) { |
| StyleRuleBase* rule = rules[i].Get(); |
| |
| if (rule->IsStyleRule()) { |
| StyleRule* style_rule = ToStyleRule(rule); |
| |
| const CSSSelectorList& selector_list = style_rule->SelectorList(); |
| for (const CSSSelector* selector = selector_list.First(); selector; |
| selector = selector_list.Next(*selector)) { |
| size_t selector_index = selector_list.SelectorIndex(*selector); |
| if (selector->HasDeepCombinatorOrShadowPseudo()) { |
| deep_combinator_or_shadow_pseudo_rules_.push_back( |
| MinimalRuleData(style_rule, selector_index, add_rule_flags)); |
| } else if (selector->HasContentPseudo()) { |
| content_pseudo_element_rules_.push_back( |
| MinimalRuleData(style_rule, selector_index, add_rule_flags)); |
| } else if (selector->HasSlottedPseudo()) { |
| slotted_pseudo_element_rules_.push_back( |
| MinimalRuleData(style_rule, selector_index, add_rule_flags)); |
| } else { |
| AddRule(style_rule, selector_index, add_rule_flags); |
| } |
| } |
| } else if (rule->IsPageRule()) { |
| AddPageRule(ToStyleRulePage(rule)); |
| } else if (rule->IsMediaRule()) { |
| StyleRuleMedia* media_rule = ToStyleRuleMedia(rule); |
| if (!media_rule->MediaQueries() || |
| medium.Eval(*media_rule->MediaQueries(), |
| &features_.ViewportDependentMediaQueryResults(), |
| &features_.DeviceDependentMediaQueryResults())) |
| AddChildRules(media_rule->ChildRules(), medium, add_rule_flags); |
| } else if (rule->IsFontFaceRule()) { |
| AddFontFaceRule(ToStyleRuleFontFace(rule)); |
| } else if (rule->IsKeyframesRule()) { |
| AddKeyframesRule(ToStyleRuleKeyframes(rule)); |
| } else if (rule->IsSupportsRule() && |
| ToStyleRuleSupports(rule)->ConditionIsSupported()) { |
| AddChildRules(ToStyleRuleSupports(rule)->ChildRules(), medium, |
| add_rule_flags); |
| } |
| } |
| } |
| |
| void RuleSet::AddRulesFromSheet(StyleSheetContents* sheet, |
| const MediaQueryEvaluator& medium, |
| AddRuleFlags add_rule_flags) { |
| TRACE_EVENT0("blink", "RuleSet::addRulesFromSheet"); |
| |
| DCHECK(sheet); |
| |
| const HeapVector<Member<StyleRuleImport>>& import_rules = |
| sheet->ImportRules(); |
| for (unsigned i = 0; i < import_rules.size(); ++i) { |
| StyleRuleImport* import_rule = import_rules[i].Get(); |
| if (import_rule->GetStyleSheet() && |
| (!import_rule->MediaQueries() || |
| medium.Eval(*import_rule->MediaQueries(), |
| &features_.ViewportDependentMediaQueryResults(), |
| &features_.DeviceDependentMediaQueryResults()))) |
| AddRulesFromSheet(import_rule->GetStyleSheet(), medium, add_rule_flags); |
| } |
| |
| AddChildRules(sheet->ChildRules(), medium, add_rule_flags); |
| } |
| |
| void RuleSet::AddStyleRule(StyleRule* rule, AddRuleFlags add_rule_flags) { |
| for (size_t selector_index = |
| rule->SelectorList().SelectorIndex(*rule->SelectorList().First()); |
| selector_index != kNotFound; |
| selector_index = |
| rule->SelectorList().IndexOfNextSelectorAfter(selector_index)) |
| AddRule(rule, selector_index, add_rule_flags); |
| } |
| |
| void RuleSet::CompactPendingRules(PendingRuleMap& pending_map, |
| CompactRuleMap& compact_map) { |
| for (auto& item : pending_map) { |
| HeapLinkedStack<RuleData>* pending_rules = item.value.Release(); |
| CompactRuleMap::ValueType* compact_rules = |
| compact_map.insert(item.key, nullptr).stored_value; |
| |
| HeapTerminatedArrayBuilder<RuleData> builder( |
| compact_rules->value.Release()); |
| builder.Grow(pending_rules->size()); |
| while (!pending_rules->IsEmpty()) { |
| builder.Append(pending_rules->Peek()); |
| pending_rules->Pop(); |
| } |
| |
| compact_rules->value = builder.Release(); |
| } |
| } |
| |
| void RuleSet::CompactRules() { |
| DCHECK(pending_rules_); |
| PendingRuleMaps* pending_rules = pending_rules_.Release(); |
| CompactPendingRules(pending_rules->id_rules, id_rules_); |
| CompactPendingRules(pending_rules->class_rules, class_rules_); |
| CompactPendingRules(pending_rules->tag_rules, tag_rules_); |
| CompactPendingRules(pending_rules->shadow_pseudo_element_rules, |
| shadow_pseudo_element_rules_); |
| link_pseudo_class_rules_.ShrinkToFit(); |
| cue_pseudo_rules_.ShrinkToFit(); |
| focus_pseudo_class_rules_.ShrinkToFit(); |
| universal_rules_.ShrinkToFit(); |
| shadow_host_rules_.ShrinkToFit(); |
| page_rules_.ShrinkToFit(); |
| font_face_rules_.ShrinkToFit(); |
| keyframes_rules_.ShrinkToFit(); |
| deep_combinator_or_shadow_pseudo_rules_.ShrinkToFit(); |
| part_pseudo_rules_.ShrinkToFit(); |
| content_pseudo_element_rules_.ShrinkToFit(); |
| slotted_pseudo_element_rules_.ShrinkToFit(); |
| } |
| |
| void MinimalRuleData::Trace(blink::Visitor* visitor) { |
| visitor->Trace(rule_); |
| } |
| |
| void RuleData::Trace(blink::Visitor* visitor) { |
| visitor->Trace(rule_); |
| } |
| |
| void RuleSet::PendingRuleMaps::Trace(blink::Visitor* visitor) { |
| visitor->Trace(id_rules); |
| visitor->Trace(class_rules); |
| visitor->Trace(tag_rules); |
| visitor->Trace(shadow_pseudo_element_rules); |
| } |
| |
| void RuleSet::Trace(blink::Visitor* visitor) { |
| visitor->Trace(id_rules_); |
| visitor->Trace(class_rules_); |
| visitor->Trace(tag_rules_); |
| visitor->Trace(shadow_pseudo_element_rules_); |
| visitor->Trace(link_pseudo_class_rules_); |
| visitor->Trace(cue_pseudo_rules_); |
| visitor->Trace(focus_pseudo_class_rules_); |
| visitor->Trace(universal_rules_); |
| visitor->Trace(shadow_host_rules_); |
| visitor->Trace(page_rules_); |
| visitor->Trace(font_face_rules_); |
| visitor->Trace(keyframes_rules_); |
| visitor->Trace(deep_combinator_or_shadow_pseudo_rules_); |
| visitor->Trace(part_pseudo_rules_); |
| visitor->Trace(content_pseudo_element_rules_); |
| visitor->Trace(slotted_pseudo_element_rules_); |
| visitor->Trace(pending_rules_); |
| #ifndef NDEBUG |
| visitor->Trace(all_rules_); |
| #endif |
| } |
| |
| #ifndef NDEBUG |
| void RuleSet::Show() const { |
| for (const auto& rule : all_rules_) |
| rule.Selector().Show(); |
| } |
| #endif |
| |
| } // namespace blink |
