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diff --git a/Source/WebCore/css/parser/CSSParserSelector.cpp b/Source/WebCore/css/parser/CSSParserSelector.cpp
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+++ b/Source/WebCore/css/parser/CSSParserSelector.cpp
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+/*
+ * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
+ * Copyright (C) 2004, 2005, 2006, 2008, 2014 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.
+ */
+
+#include "config.h"
+#include "CSSParserSelector.h"
+
+#include "CSSCustomPropertyValue.h"
+#include "CSSParserIdioms.h"
+#include "CSSPrimitiveValue.h"
+#include "CSSFunctionValue.h"
+#include "CSSSelector.h"
+#include "CSSSelectorList.h"
+#include "SelectorPseudoTypeMap.h"
+
+#if COMPILER(MSVC)
+// See https://msdn.microsoft.com/en-us/library/1wea5zwe.aspx
+#pragma warning(disable: 4701)
+#endif
+
+namespace WebCore {
+
+using namespace WTF;
+
+CSSParserSelector* CSSParserSelector::parsePagePseudoSelector(const AtomicString& pseudoTypeString)
+{
+    CSSSelector::PagePseudoClassType pseudoType;
+    if (equalLettersIgnoringASCIICase(pseudoTypeString, "first"))
+        pseudoType = CSSSelector::PagePseudoClassFirst;
+    else if (equalLettersIgnoringASCIICase(pseudoTypeString, "left"))
+        pseudoType = CSSSelector::PagePseudoClassLeft;
+    else if (equalLettersIgnoringASCIICase(pseudoTypeString, "right"))
+        pseudoType = CSSSelector::PagePseudoClassRight;
+    else
+        return nullptr;
+    
+    auto selector = std::make_unique<CSSParserSelector>();
+    selector->m_selector->setMatch(CSSSelector::PagePseudoClass);
+    selector->m_selector->setPagePseudoType(pseudoType);
+    return selector.release();
+}
+
+CSSParserSelector* CSSParserSelector::parsePseudoElementSelectorFromStringView(StringView& pseudoTypeString)
+{
+    AtomicString name = pseudoTypeString.toAtomicString();
+    
+    CSSSelector::PseudoElementType pseudoType = CSSSelector::parsePseudoElementType(name);
+    if (pseudoType == CSSSelector::PseudoElementUnknown) {
+        // FIXME-NEWPARSER: We can't add "slotted" to the map without breaking the old
+        // parser, so this hack ensures the new parser still recognizes it. When the new
+        // parser turns on, we can add "slotted" to the map and remove this code.
+        if (pseudoTypeString.startsWithIgnoringASCIICase("slotted"))
+            pseudoType = CSSSelector::PseudoElementSlotted;
+        else
+            return nullptr;
+    }
+
+    auto selector = std::make_unique<CSSParserSelector>();
+    selector->m_selector->setMatch(CSSSelector::PseudoElement);
+    selector->m_selector->setPseudoElementType(pseudoType);
+    if (pseudoType == CSSSelector::PseudoElementWebKitCustomLegacyPrefixed) {
+        ASSERT_WITH_MESSAGE(name == "-webkit-input-placeholder", "-webkit-input-placeholder is the only LegacyPrefix pseudo type.");
+        if (name == "-webkit-input-placeholder")
+            name = AtomicString("placeholder", AtomicString::ConstructFromLiteral);
+    }
+    selector->m_selector->setValue(name);
+    return selector.release();
+}
+
+CSSParserSelector* CSSParserSelector::parsePseudoClassSelectorFromStringView(StringView& pseudoTypeString)
+{
+    PseudoClassOrCompatibilityPseudoElement pseudoType = parsePseudoClassAndCompatibilityElementString(pseudoTypeString);
+    if (pseudoType.pseudoClass != CSSSelector::PseudoClassUnknown) {
+        auto selector = std::make_unique<CSSParserSelector>();
+        selector->m_selector->setMatch(CSSSelector::PseudoClass);
+        selector->m_selector->setPseudoClassType(pseudoType.pseudoClass);
+        return selector.release();
+    }
+    if (pseudoType.compatibilityPseudoElement != CSSSelector::PseudoElementUnknown) {
+        auto selector = std::make_unique<CSSParserSelector>();
+        selector->m_selector->setMatch(CSSSelector::PseudoElement);
+        selector->m_selector->setPseudoElementType(pseudoType.compatibilityPseudoElement);
+        AtomicString name = pseudoTypeString.toAtomicString();
+        selector->m_selector->setValue(name);
+        return selector.release();
+    }
+    return nullptr;
+}
+
+CSSParserSelector::CSSParserSelector()
+    : m_selector(std::make_unique<CSSSelector>())
+{
+}
+
+CSSParserSelector::CSSParserSelector(const QualifiedName& tagQName)
+    : m_selector(std::make_unique<CSSSelector>(tagQName))
+{
+}
+
+CSSParserSelector::~CSSParserSelector()
+{
+    if (!m_tagHistory)
+        return;
+    Vector<std::unique_ptr<CSSParserSelector>, 16> toDelete;
+    std::unique_ptr<CSSParserSelector> selector = WTFMove(m_tagHistory);
+    while (true) {
+        std::unique_ptr<CSSParserSelector> next = WTFMove(selector->m_tagHistory);
+        toDelete.append(WTFMove(selector));
+        if (!next)
+            break;
+        selector = WTFMove(next);
+    }
+}
+
+void CSSParserSelector::adoptSelectorVector(Vector<std::unique_ptr<CSSParserSelector>>& selectorVector)
+{
+    auto selectorList = std::make_unique<CSSSelectorList>();
+    selectorList->adoptSelectorVector(selectorVector);
+    m_selector->setSelectorList(WTFMove(selectorList));
+}
+
+void CSSParserSelector::setLangArgumentList(std::unique_ptr<Vector<AtomicString>> argumentList)
+{
+    ASSERT_WITH_MESSAGE(!argumentList->isEmpty(), "No CSS Selector takes an empty argument list.");
+    m_selector->setLangArgumentList(WTFMove(argumentList));
+}
+
+void CSSParserSelector::setSelectorList(std::unique_ptr<CSSSelectorList> selectorList)
+{
+    m_selector->setSelectorList(WTFMove(selectorList));
+}
+
+static bool selectorListMatchesPseudoElement(const CSSSelectorList* selectorList)
+{
+    if (!selectorList)
+        return false;
+
+    for (const CSSSelector* subSelector = selectorList->first(); subSelector; subSelector = CSSSelectorList::next(subSelector)) {
+        for (const CSSSelector* selector = subSelector; selector; selector = selector->tagHistory()) {
+            if (selector->matchesPseudoElement())
+                return true;
+            if (const CSSSelectorList* subselectorList = selector->selectorList()) {
+                if (selectorListMatchesPseudoElement(subselectorList))
+                    return true;
+            }
+        }
+    }
+    return false;
+}
+
+bool CSSParserSelector::matchesPseudoElement() const
+{
+    return m_selector->matchesPseudoElement() || selectorListMatchesPseudoElement(m_selector->selectorList());
+}
+
+void CSSParserSelector::insertTagHistory(CSSSelector::RelationType before, std::unique_ptr<CSSParserSelector> selector, CSSSelector::RelationType after)
+{
+    if (m_tagHistory)
+        selector->setTagHistory(WTFMove(m_tagHistory));
+    setRelation(before);
+    selector->setRelation(after);
+    m_tagHistory = WTFMove(selector);
+}
+
+void CSSParserSelector::appendTagHistory(CSSSelector::RelationType relation, std::unique_ptr<CSSParserSelector> selector)
+{
+    CSSParserSelector* end = this;
+    while (end->tagHistory())
+        end = end->tagHistory();
+
+    end->setRelation(relation);
+    end->setTagHistory(WTFMove(selector));
+}
+
+void CSSParserSelector::appendTagHistory(CSSParserSelectorCombinator relation, std::unique_ptr<CSSParserSelector> selector)
+{
+    CSSParserSelector* end = this;
+    while (end->tagHistory())
+        end = end->tagHistory();
+
+    CSSSelector::RelationType selectorRelation;
+    switch (relation) {
+    case CSSParserSelectorCombinator::Child:
+        selectorRelation = CSSSelector::Child;
+        break;
+    case CSSParserSelectorCombinator::DescendantSpace:
+        selectorRelation = CSSSelector::DescendantSpace;
+        break;
+#if ENABLE(CSS_SELECTORS_LEVEL4)
+    case CSSParserSelectorCombinator::DescendantDoubleChild:
+        selectorRelation = CSSSelector::DescendantDoubleChild;
+        break;
+#endif
+    case CSSParserSelectorCombinator::DirectAdjacent:
+        selectorRelation = CSSSelector::DirectAdjacent;
+        break;
+    case CSSParserSelectorCombinator::IndirectAdjacent:
+        selectorRelation = CSSSelector::IndirectAdjacent;
+        break;
+    }
+    end->setRelation(selectorRelation);
+    end->setTagHistory(WTFMove(selector));
+}
+
+void CSSParserSelector::prependTagSelector(const QualifiedName& tagQName, bool tagIsForNamespaceRule)
+{
+    auto second = std::make_unique<CSSParserSelector>();
+    second->m_selector = WTFMove(m_selector);
+    second->m_tagHistory = WTFMove(m_tagHistory);
+    m_tagHistory = WTFMove(second);
+
+    m_selector = std::make_unique<CSSSelector>(tagQName, tagIsForNamespaceRule);
+    m_selector->setRelation(CSSSelector::Subselector);
+}
+
+std::unique_ptr<CSSParserSelector> CSSParserSelector::releaseTagHistory()
+{
+    setRelation(CSSSelector::Subselector);
+    return WTFMove(m_tagHistory);
+}
+
+// FIXME-NEWPARSER: Add support for :host-context
+bool CSSParserSelector::isHostPseudoSelector() const
+{
+    return match() == CSSSelector::PseudoClass && pseudoClassType() == CSSSelector::PseudoClassHost;
+}
+
+}
+