Support type selector for camel-cased SVG elements in HTML.

Source/core/css/parser/CSSSelectorParser.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/css/parser/CSSSelectorParser.h"
 
+#include "core/css/CSSLocalNameToLowerMaps.h"
 #include "core/css/CSSSelectorList.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/frame/UseCounter.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 void CSSSelectorParser::parseSelector(CSSParserTokenRange range, const CSSParserContext& context, const AtomicString& defaultNamespace, StyleSheetContents* styleSheet, CSSSelectorList& output)
 {
     CSSSelectorParser parser(context, defaultNamespace, styleSheet);
@@ skipping 81 matching lines @@
     return selector.release();
 }
 
 PassOwnPtr<CSSParserSelector> CSSSelectorParser::consumeCompoundSelector(CSSParserTokenRange& range)
 {
     OwnPtr<CSSParserSelector> compoundSelector;
 
     AtomicString namespacePrefix;
     AtomicString elementName;
     bool hasNamespace;
+    TagSelectorCase tagSelectorCase = TagLowerCase;
     if (!consumeName(range, elementName, namespacePrefix, hasNamespace)) {
         compoundSelector = consumeSimpleSelector(range);
         if (!compoundSelector)
             return nullptr;
     }
-    if (m_context.isHTMLDocument())
-        elementName = elementName.lower();
+    if (m_context.isHTMLDocument() && !elementName.isNull()) {
+        if (CSSLocalNameToLowerMaps::elementToLower(elementName).isNull())
+            elementName = elementName.lower();
+        else
+            tagSelectorCase = TagCamelCase;
+    }
 
     while (OwnPtr<CSSParserSelector> simpleSelector = consumeSimpleSelector(range)) {
         if (compoundSelector)
             compoundSelector = addSimpleSelectorToCompound(compoundSelector.release(), simpleSelector.release());
         else
             compoundSelector = simpleSelector.release();
     }
 
     if (!compoundSelector) {
         if (hasNamespace)
-            return CSSParserSelector::create(determineNameInNamespace(namespacePrefix, elementName));
-        return CSSParserSelector::create(QualifiedName(nullAtom, elementName, m_defaultNamespace));
+            return CSSParserSelector::create(determineNameInNamespace(namespacePrefix, elementName), false, tagSelectorCase);
+        return CSSParserSelector::create(QualifiedName(nullAtom, elementName, m_defaultNamespace), false, tagSelectorCase);
     }
-    prependTypeSelectorIfNeeded(namespacePrefix, elementName, compoundSelector.get());
+    prependTypeSelectorIfNeeded(namespacePrefix, elementName, compoundSelector.get(), tagSelectorCase);
     return compoundSelector.release();
 }
 
 PassOwnPtr<CSSParserSelector> CSSSelectorParser::consumeSimpleSelector(CSSParserTokenRange& range)
 {
     const CSSParserToken& token = range.peek();
     OwnPtr<CSSParserSelector> selector;
     if (token.type() == HashToken)
         selector = consumeId(range);
     else if (token.type() == DelimiterToken && token.delimiter() == '.')
@@ skipping 371 matching lines @@
     return true;
 }
 
 QualifiedName CSSSelectorParser::determineNameInNamespace(const AtomicString& prefix, const AtomicString& localName)
 {
     if (!m_styleSheet)
         return QualifiedName(prefix, localName, m_defaultNamespace);
     return QualifiedName(prefix, localName, m_styleSheet->determineNamespace(prefix));
 }
 
-void CSSSelectorParser::prependTypeSelectorIfNeeded(const AtomicString& namespacePrefix, const AtomicString& elementName, CSSParserSelector* compoundSelector)
+void CSSSelectorParser::prependTypeSelectorIfNeeded(const AtomicString& namespacePrefix, const AtomicString& elementName, CSSParserSelector* compoundSelector, TagSelectorCase tagSelectorCase)
 {
     if (elementName.isNull() && m_defaultNamespace == starAtom && !compoundSelector->crossesTreeScopes())
         return;
 
     AtomicString determinedElementName = elementName.isNull() ? starAtom : elementName;
     AtomicString determinedNamespace = namespacePrefix != nullAtom && m_styleSheet ? m_styleSheet->determineNamespace(namespacePrefix) : m_defaultNamespace;
     QualifiedName tag(namespacePrefix, determinedElementName, determinedNamespace);
 
     if (compoundSelector->crossesTreeScopes())
-        return rewriteSpecifiersWithElementNameForCustomPseudoElement(tag, compoundSelector, elementName.isNull());
+        return rewriteSpecifiersWithElementNameForCustomPseudoElement(tag, compoundSelector, elementName.isNull(), tagSelectorCase);
 
     if (compoundSelector->isContentPseudoElement())
-        return rewriteSpecifiersWithElementNameForContentPseudoElement(tag, compoundSelector, elementName.isNull());
+        return rewriteSpecifiersWithElementNameForContentPseudoElement(tag, compoundSelector, elementName.isNull(), tagSelectorCase);
 
     // *:host never matches, so we can't discard the * otherwise we can't tell the
     // difference between *:host and just :host.
     if (tag == anyQName() && !compoundSelector->hasHostPseudoSelector())
         return;
-    compoundSelector->prependTagSelector(tag, elementName.isNull());
+    compoundSelector->prependTagSelector(tag, elementName.isNull(), tagSelectorCase);
 }
 
-void CSSSelectorParser::rewriteSpecifiersWithElementNameForCustomPseudoElement(const QualifiedName& tag, CSSParserSelector* specifiers, bool tagIsImplicit)
+void CSSSelectorParser::rewriteSpecifiersWithElementNameForCustomPseudoElement(const QualifiedName& tag, CSSParserSelector* specifiers, bool tagIsImplicit, TagSelectorCase tagSelectorCase)
 {
     CSSParserSelector* lastShadowPseudo = specifiers;
     CSSParserSelector* history = specifiers;
     while (history->tagHistory()) {
         history = history->tagHistory();
         if (history->crossesTreeScopes() || history->hasShadowPseudo())
             lastShadowPseudo = history;
     }
 
     if (lastShadowPseudo->tagHistory()) {
         if (tag != anyQName())
-            lastShadowPseudo->tagHistory()->prependTagSelector(tag, tagIsImplicit);
+            lastShadowPseudo->tagHistory()->prependTagSelector(tag, tagIsImplicit, tagSelectorCase);
         return;
     }
 
     // For shadow-ID pseudo-elements to be correctly matched, the ShadowPseudo combinator has to be used.
     // We therefore create a new Selector with that combinator here in any case, even if matching any (host) element in any namespace (i.e. '*').
-    OwnPtr<CSSParserSelector> elementNameSelector = CSSParserSelector::create(tag);
+    OwnPtr<CSSParserSelector> elementNameSelector = CSSParserSelector::create(tag, false /* isImplicit */, tagSelectorCase);
     lastShadowPseudo->setTagHistory(elementNameSelector.release());
     lastShadowPseudo->setRelation(CSSSelector::ShadowPseudo);
 }
 
-void CSSSelectorParser::rewriteSpecifiersWithElementNameForContentPseudoElement(const QualifiedName& tag, CSSParserSelector* specifiers, bool tagIsImplicit)
+void CSSSelectorParser::rewriteSpecifiersWithElementNameForContentPseudoElement(const QualifiedName& tag, CSSParserSelector* specifiers, bool tagIsImplicit, TagSelectorCase tagSelectorCase)
 {
     CSSParserSelector* last = specifiers;
     CSSParserSelector* history = specifiers;
     while (history->tagHistory()) {
         history = history->tagHistory();
         if (history->isContentPseudoElement() || history->relationIsAffectedByPseudoContent())
             last = history;
     }
 
     if (last->tagHistory()) {
         if (tag != anyQName())
-            last->tagHistory()->prependTagSelector(tag, tagIsImplicit);
+            last->tagHistory()->prependTagSelector(tag, tagIsImplicit, tagSelectorCase);
         return;
     }
 
     // For shadow-ID pseudo-elements to be correctly matched, the ShadowPseudo combinator has to be used.
     // We therefore create a new Selector with that combinator here in any case, even if matching any (host) element in any namespace (i.e. '*').
-    OwnPtr<CSSParserSelector> elementNameSelector = CSSParserSelector::create(tag);
+    OwnPtr<CSSParserSelector> elementNameSelector = CSSParserSelector::create(tag, false /* isImplicit */, tagSelectorCase);
     last->setTagHistory(elementNameSelector.release());
 }
 
 PassOwnPtr<CSSParserSelector> CSSSelectorParser::addSimpleSelectorToCompound(PassOwnPtr<CSSParserSelector> compoundSelector, PassOwnPtr<CSSParserSelector> simpleSelector)
 {
     // The tagHistory is a linked list that stores combinator separated compound selectors
     // from right-to-left. Yet, within a single compound selector, stores the simple selectors
     // from left-to-right.
     //
     // ".a.b > div#id" is stored in a tagHistory as [div, #id, .a, .b], each element in the
@@ skipping 80 matching lines @@
                 context.useCounter()->count(feature);
             if (current->relation() == CSSSelector::ShadowDeep)
                 context.useCounter()->count(UseCounter::CSSDeepCombinator);
             if (current->selectorList())
                 recordSelectorStats(context, *current->selectorList());
         }
     }
 }
 
 } // namespace blink