author | Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com> |
Fri, 08 May 2009 08:25:06 +0300 | |
changeset 8 | 7c90e6132015 |
parent 0 | dd21522fd290 |
child 13 | 10e98eab6f85 |
permissions | -rw-r--r-- |
0
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/** |
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* This file is part of the DOM implementation for KDE. |
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* |
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* Copyright (C) 2005, 2006 Apple Computer, Inc. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Library General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public License |
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* along with this library; see the file COPYING.LIB. If not, write to |
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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* Boston, MA 02110-1301, USA. |
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*/ |
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#include "config.h" |
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#ifdef AVOID_STATIC_CONSTRUCTORS |
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#define WEBCORE_QUALIFIEDNAME_HIDE_GLOBALS 1 |
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#else |
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#define QNAME_DEFAULT_CONSTRUCTOR |
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#endif |
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#include "QualifiedName.h" |
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#include "StaticConstructors.h" |
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#include <wtf/Assertions.h> |
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#include <wtf/HashSet.h> |
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namespace WebCore { |
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struct QualifiedNameComponents { |
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StringImpl* m_prefix; |
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StringImpl* m_localName; |
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StringImpl* m_namespace; |
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}; |
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// Golden ratio - arbitrary start value to avoid mapping all 0's to all 0's |
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static const unsigned PHI = 0x9e3779b9U; |
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static inline unsigned hashComponents(const QualifiedNameComponents& buf) |
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{ |
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ASSERT(sizeof(QualifiedNameComponents) % (sizeof(uint16_t) * 2) == 0); |
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unsigned l = sizeof(QualifiedNameComponents) / (sizeof(uint16_t) * 2); |
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const uint16_t* s = reinterpret_cast<const uint16_t*>(&buf); |
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uint32_t hash = PHI; |
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// Main loop |
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for (; l > 0; l--) { |
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hash += s[0]; |
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uint32_t tmp = (s[1] << 11) ^ hash; |
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hash = (hash << 16) ^ tmp; |
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s += 2; |
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hash += hash >> 11; |
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} |
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// Force "avalanching" of final 127 bits |
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hash ^= hash << 3; |
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hash += hash >> 5; |
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hash ^= hash << 2; |
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hash += hash >> 15; |
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hash ^= hash << 10; |
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// this avoids ever returning a hash code of 0, since that is used to |
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// signal "hash not computed yet", using a value that is likely to be |
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// effectively the same as 0 when the low bits are masked |
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if (hash == 0) |
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hash = 0x80000000; |
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return hash; |
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} |
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struct QNameHash { |
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static unsigned hash(const QualifiedName::QualifiedNameImpl* name) { |
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QualifiedNameComponents c = { name->m_prefix.impl(), name->m_localName.impl(), name->m_namespace.impl() }; |
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return hashComponents(c); |
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} |
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static bool equal(const QualifiedName::QualifiedNameImpl* a, const QualifiedName::QualifiedNameImpl* b) { return a == b; } |
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}; |
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typedef HashSet<QualifiedName::QualifiedNameImpl*, QNameHash> QNameSet; |
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struct QNameComponentsTranslator { |
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static unsigned hash(const QualifiedNameComponents& components) { |
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return hashComponents(components); |
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} |
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static bool equal(QualifiedName::QualifiedNameImpl* name, const QualifiedNameComponents& c) { |
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return c.m_prefix == name->m_prefix.impl() && c.m_localName == name->m_localName.impl() && c.m_namespace == name->m_namespace.impl(); |
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} |
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static void translate(QualifiedName::QualifiedNameImpl*& location, const QualifiedNameComponents& components, unsigned hash) { |
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location = new QualifiedName::QualifiedNameImpl(components.m_prefix, components.m_localName, components.m_namespace); |
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} |
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}; |
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static QNameSet* gNameCache; |
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QualifiedName::QualifiedName(const AtomicString& p, const AtomicString& l, const AtomicString& n) |
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: m_impl(0) |
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{ |
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if (!gNameCache) |
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gNameCache = new QNameSet; |
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QualifiedNameComponents components = { p.impl(), l.impl(), n.impl() }; |
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m_impl = *gNameCache->add<QualifiedNameComponents, QNameComponentsTranslator>(components).first; |
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ref(); |
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} |
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112 |
|
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QualifiedName::~QualifiedName() |
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{ |
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deref(); |
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} |
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|
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QualifiedName::QualifiedName(const QualifiedName& other) |
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{ |
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m_impl = other.m_impl; |
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ref(); |
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} |
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|
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const QualifiedName& QualifiedName::operator=(const QualifiedName& other) |
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{ |
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if (m_impl != other.m_impl) { |
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deref(); |
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m_impl = other.m_impl; |
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ref(); |
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} |
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|
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return *this; |
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} |
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|
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void QualifiedName::deref() |
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{ |
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#ifdef QNAME_DEFAULT_CONSTRUCTOR |
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if (!m_impl) |
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return; |
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#endif |
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|
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if (m_impl->hasOneRef()) |
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gNameCache->remove(m_impl); |
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m_impl->deref(); |
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} |
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|
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void QualifiedName::setPrefix(const AtomicString& prefix) |
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{ |
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QualifiedName other(prefix, localName(), namespaceURI()); |
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*this = other; |
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} |
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String QualifiedName::toString() const |
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{ |
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String local = localName(); |
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if (hasPrefix()) |
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return prefix() + ":" + local; |
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return local; |
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} |
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|
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// Global init routines |
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DEFINE_GLOBAL(QualifiedName, anyName, nullAtom, starAtom, starAtom) |
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void QualifiedName::init() |
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{ |
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static bool initialized; |
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if (!initialized) { |
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// Use placement new to initialize the globals. |
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AtomicString::init(); |
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new ((void*)&anyName) QualifiedName(nullAtom, starAtom, starAtom); |
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initialized = true; |
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} |
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} |
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} |