Current work-in-progress crbug.com/567021

third_party/WebKit/Source/core/css/RuleSet.cpp

 /*
  * 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.
@@ skipping 212 matching lines @@
         m_universalRules.append(ruleData);
     }
 }
 
 void RuleSet::addPageRule(StyleRulePage* rule)
 {
     ensurePendingRules(); // So that m_pageRules.shrinkToFit() gets called.
     m_pageRules.append(rule);
 }
 
-void RuleSet::addViewportRule(StyleRuleViewport* rule)
-{
-    ensurePendingRules(); // So that m_viewportRules.shrinkToFit() gets called.
-    m_viewportRules.append(rule);
-}
-
 void RuleSet::addFontFaceRule(StyleRuleFontFace* rule)
 {
     ensurePendingRules(); // So that m_fontFaceRules.shrinkToFit() gets called.
     m_fontFaceRules.append(rule);
 }
 
 void RuleSet::addKeyframesRule(StyleRuleKeyframes* rule)
 {
     ensurePendingRules(); // So that m_keyframesRules.shrinkToFit() gets called.
     m_keyframesRules.append(rule);
@@ skipping 16 matching lines @@
                 } else if (selectorList.selectorHasSlottedPseudo(selectorIndex)) {
                     m_slottedPseudoElementRules.append(MinimalRuleData(styleRule, selectorIndex, addRuleFlags));
                 } else {
                     addRule(styleRule, selectorIndex, addRuleFlags);
                 }
             }
         } else if (rule->isPageRule()) {
             addPageRule(toStyleRulePage(rule));
         } else if (rule->isMediaRule()) {
             StyleRuleMedia* mediaRule = toStyleRuleMedia(rule);
-            if ((!mediaRule->mediaQueries() || medium.eval(mediaRule->mediaQueries(), &m_viewportDependentMediaQueryResults, &m_deviceDependentMediaQueryResults)))
+            if ((!mediaRule->mediaQueries() || medium.eval(mediaRule->mediaQueries(), &m_features.viewportDependentMediaQueryResults, &m_features.deviceDependentMediaQueryResults)))
                 addChildRules(mediaRule->childRules(), medium, addRuleFlags);
         } else if (rule->isFontFaceRule()) {
             addFontFaceRule(toStyleRuleFontFace(rule));
         } else if (rule->isKeyframesRule()) {
             addKeyframesRule(toStyleRuleKeyframes(rule));
-        } else if (rule->isViewportRule()) {
-            addViewportRule(toStyleRuleViewport(rule));
         } else if (rule->isSupportsRule() && toStyleRuleSupports(rule)->conditionIsSupported()) {
             addChildRules(toStyleRuleSupports(rule)->childRules(), medium, addRuleFlags);
         }
     }
 }
 
 void RuleSet::addRulesFromSheet(StyleSheetContents* sheet, const MediaQueryEvaluator& medium, AddRuleFlags addRuleFlags)
 {
     TRACE_EVENT0("blink", "RuleSet::addRulesFromSheet");
 
     ASSERT(sheet);
 
     const HeapVector<Member<StyleRuleImport>>& importRules = sheet->importRules();
     for (unsigned i = 0; i < importRules.size(); ++i) {
         StyleRuleImport* importRule = importRules[i].get();
-        if (importRule->styleSheet() && (!importRule->mediaQueries() || medium.eval(importRule->mediaQueries(), &m_viewportDependentMediaQueryResults, &m_deviceDependentMediaQueryResults)))
+        if (importRule->styleSheet() && (!importRule->mediaQueries() || medium.eval(importRule->mediaQueries(), &m_features.viewportDependentMediaQueryResults, &m_features.deviceDependentMediaQueryResults)))
             addRulesFromSheet(importRule->styleSheet(), medium, addRuleFlags);
     }
 
     addChildRules(sheet->childRules(), medium, addRuleFlags);
 }
 
 void RuleSet::addStyleRule(StyleRule* rule, AddRuleFlags addRuleFlags)
 {
     for (size_t selectorIndex = 0; selectorIndex != kNotFound; selectorIndex = rule->selectorList().indexOfNextSelectorAfter(selectorIndex))
         addRule(rule, selectorIndex, addRuleFlags);
@@ skipping 23 matching lines @@
     compactPendingRules(pendingRules->idRules, m_idRules);
     compactPendingRules(pendingRules->classRules, m_classRules);
     compactPendingRules(pendingRules->tagRules, m_tagRules);
     compactPendingRules(pendingRules->shadowPseudoElementRules, m_shadowPseudoElementRules);
     m_linkPseudoClassRules.shrinkToFit();
     m_cuePseudoRules.shrinkToFit();
     m_focusPseudoClassRules.shrinkToFit();
     m_universalRules.shrinkToFit();
     m_shadowHostRules.shrinkToFit();
     m_pageRules.shrinkToFit();
-    m_viewportRules.shrinkToFit();
     m_fontFaceRules.shrinkToFit();
     m_keyframesRules.shrinkToFit();
     m_deepCombinatorOrShadowPseudoRules.shrinkToFit();
     m_contentPseudoElementRules.shrinkToFit();
     m_slottedPseudoElementRules.shrinkToFit();
 }
 
+RuleSet* RuleSet::emptyRuleSet()
+{
+    DEFINE_STATIC_LOCAL(Persistent<RuleSet>, s_emptyRuleSet, ());
+    if (!s_emptyRuleSet)
+        s_emptyRuleSet = RuleSet::create();
+    return s_emptyRuleSet;
+}
+
 DEFINE_TRACE(MinimalRuleData)
 {
     visitor->trace(m_rule);
 }
 
 DEFINE_TRACE(RuleData)
 {
     visitor->trace(m_rule);
 }
 
@@ skipping 11 matching lines @@
     visitor->trace(m_classRules);
     visitor->trace(m_tagRules);
     visitor->trace(m_shadowPseudoElementRules);
     visitor->trace(m_linkPseudoClassRules);
     visitor->trace(m_cuePseudoRules);
     visitor->trace(m_focusPseudoClassRules);
     visitor->trace(m_universalRules);
     visitor->trace(m_shadowHostRules);
     visitor->trace(m_features);
     visitor->trace(m_pageRules);
-    visitor->trace(m_viewportRules);
     visitor->trace(m_fontFaceRules);
     visitor->trace(m_keyframesRules);
     visitor->trace(m_deepCombinatorOrShadowPseudoRules);
     visitor->trace(m_contentPseudoElementRules);
     visitor->trace(m_slottedPseudoElementRules);
-    visitor->trace(m_viewportDependentMediaQueryResults);
-    visitor->trace(m_deviceDependentMediaQueryResults);
     visitor->trace(m_pendingRules);
 #ifndef NDEBUG
     visitor->trace(m_allRules);
 #endif
 }
 
 #ifndef NDEBUG
 void RuleSet::show() const
 {
     for (const auto& rule: m_allRules)
         rule.selector().show();
 }
 #endif
 
 } // namespace blink