src/third_party/WebKit/Source/core/dom/QualifiedName.cpp

   1 /*
   2  * Copyright (C) 2005, 2006, 2009 Apple Inc. All rights reserved.
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Library General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Library General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Library General Public License
  15  * along with this library; see the file COPYING.LIB.  If not, write to
  16  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  17  * Boston, MA 02110-1301, USA.
  18  */
  19
  20 #include "config.h"
  21
  22 #include "core/dom/QualifiedName.h"
  23
  24 #include "core/HTMLNames.h"
  25 #include "core/SVGNames.h"
  26 #include "core/XLinkNames.h"
  27 #include "core/XMLNSNames.h"
  28 #include "core/XMLNames.h"
  29 #include "wtf/Assertions.h"
  30 #include "wtf/HashSet.h"
  31 #include "wtf/MainThread.h"
  32 #include "wtf/StaticConstructors.h"
  33
  34 namespace blink {
  35
  36 static const int staticQualifiedNamesCount = HTMLNames::HTMLTagsCount + HTMLNames::HTMLAttrsCount
  37     + SVGNames::SVGTagsCount + SVGNames::SVGAttrsCount
  38     + XLinkNames::XLinkAttrsCount
  39     + XMLNSNames::XMLNSAttrsCount
  40     + XMLNames::XMLAttrsCount;
  41
  42 struct QualifiedNameHashTraits : public HashTraits<QualifiedName::QualifiedNameImpl*> {
  43     static const unsigned minimumTableSize = WTF::HashTableCapacityForSize<staticQualifiedNamesCount>::value;
  44 };
  45
  46 typedef HashSet<QualifiedName::QualifiedNameImpl*, QualifiedNameHash, QualifiedNameHashTraits> QualifiedNameCache;
  47
  48 static QualifiedNameCache& qualifiedNameCache()
  49 {
  50     // This code is lockless and thus assumes it all runs on one thread!
  51     ASSERT(isMainThread());
  52     static QualifiedNameCache* gNameCache = new QualifiedNameCache;
  53     return *gNameCache;
  54 }
  55
  56 struct QNameComponentsTranslator {
  57     static unsigned hash(const QualifiedNameData& data)
  58     {
  59         return hashComponents(data.m_components);
  60     }
  61     static bool equal(QualifiedName::QualifiedNameImpl* name, const QualifiedNameData& data)
  62     {
  63         return data.m_components.m_prefix == name->m_prefix.impl()
  64             && data.m_components.m_localName == name->m_localName.impl()
  65             && data.m_components.m_namespace == name->m_namespace.impl();
  66     }
  67     static void translate(QualifiedName::QualifiedNameImpl*& location, const QualifiedNameData& data, unsigned)
  68     {
  69         const QualifiedNameComponents& components = data.m_components;
  70         location = QualifiedName::QualifiedNameImpl::create(AtomicString(components.m_prefix), AtomicString(components.m_localName), AtomicString(components.m_namespace), data.m_isStatic).leakRef();
  71     }
  72 };
  73
  74 QualifiedName::QualifiedName(const AtomicString& p, const AtomicString& l, const AtomicString& n)
  75 {
  76     QualifiedNameData data = { { p.impl(), l.impl(), n.isEmpty() ? nullAtom.impl() : n.impl() }, false };
  77     QualifiedNameCache::AddResult addResult = qualifiedNameCache().add<QNameComponentsTranslator>(data);
  78     m_impl = addResult.isNewEntry ? adoptRef(*addResult.storedValue) : *addResult.storedValue;
  79 }
  80
  81 QualifiedName::QualifiedName(const AtomicString& p, const AtomicString& l, const AtomicString& n, bool isStatic)
  82 {
  83     QualifiedNameData data = { { p.impl(), l.impl(), n.impl() }, isStatic };
  84     QualifiedNameCache::AddResult addResult = qualifiedNameCache().add<QNameComponentsTranslator>(data);
  85     m_impl = addResult.isNewEntry ? adoptRef(*addResult.storedValue) : *addResult.storedValue;
  86 }
  87
  88 QualifiedName::~QualifiedName()
  89 {
  90 }
  91
  92 QualifiedName::QualifiedNameImpl::~QualifiedNameImpl()
  93 {
  94     qualifiedNameCache().remove(this);
  95 }
  96
  97 String QualifiedName::toString() const
  98 {
  99     String local = localName();
 100     if (hasPrefix())
 101         return prefix().string() + ":" + local;
 102     return local;
 103 }
 104
 105 // Global init routines
 106 DEFINE_GLOBAL(QualifiedName, anyName, nullAtom, starAtom, starAtom)
 107
 108 void QualifiedName::init()
 109 {
 110     ASSERT(starAtom.impl());
 111     new ((void*)&anyName) QualifiedName(nullAtom, starAtom, starAtom, true );
 112 }
 113
 114 const QualifiedName& QualifiedName::null()
 115 {
 116     DEFINE_STATIC_LOCAL(QualifiedName, nullName, (nullAtom, nullAtom, nullAtom, true));
 117     return nullName;
 118 }
 119
 120 const AtomicString& QualifiedName::localNameUpper() const
 121 {
 122     if (!m_impl->m_localNameUpper)
 123         m_impl->m_localNameUpper = m_impl->m_localName.upper();
 124     return m_impl->m_localNameUpper;
 125 }
 126
 127 unsigned QualifiedName::QualifiedNameImpl::computeHash() const
 128 {
 129     QualifiedNameComponents components = { m_prefix.impl(), m_localName.impl(), m_namespace.impl() };
 130     return hashComponents(components);
 131 }
 132
 133 void QualifiedName::createStatic(void* targetAddress, StringImpl* name, const AtomicString& nameNamespace)
 134 {
 135     new (targetAddress) QualifiedName(nullAtom, AtomicString(name), nameNamespace, true);
 136 }
 137
 138 void QualifiedName::createStatic(void* targetAddress, StringImpl* name)
 139 {
 140     new (targetAddress) QualifiedName(nullAtom, AtomicString(name), nullAtom, true);
 141 }
 142
 143 }