File indexing completed on 2024-04-28 11:38:27

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 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.
  *
  */
 
 #ifdef AVOID_STATIC_CONSTRUCTORS
 #define ATOMICSTRING_HIDE_GLOBALS 1
 #endif
 
 #include "AtomicString.h"
 
 //#include "StaticConstructors.h"
 #include "StringHash.h"
 //#include <kjs/identifier.h>
 #include <wtf/HashSet.h>
 
 //using KJS::Identifier;
 //using KJS::UString;
 
 namespace khtml
 {
 
 static HashSet<DOMStringImpl *> *stringTable;
 
 struct CStringTranslator {
     static unsigned hash(const char *c)
     {
         return DOMStringImpl::computeHash(c);
     }
 
     static bool equal(DOMStringImpl *r, const char *s)
     {
         int length = r->length();
         const QChar *d = r->unicode();
         for (int i = 0; i != length; ++i) {
             unsigned char c = s[i];
             if (d[i] != c) {
                 return false;
             }
         }
         return s[length] == 0;
     }
 
     static void translate(DOMStringImpl *&location, const char *const &c, unsigned hash)
     {
         location = new DOMStringImpl(c, strlen(c), hash);
     }
 };
 
 bool operator==(const AtomicString &a, const char *b)
 {
     DOMStringImpl *impl = a.impl();
     if ((!impl || !impl->unicode()) && !b) {
         return true;
     }
     if ((!impl || !impl->unicode()) || !b) {
         return false;
     }
     return CStringTranslator::equal(impl, b);
 }
 
 DOMStringImpl *AtomicString::add(const char *c)
 {
     if (!c) {
         return nullptr;
     }
     if (!*c) {
         return DOMStringImpl::empty();
     }
     init();
     std::pair<HashSet<DOMStringImpl *>::iterator, bool> addResult = stringTable->add<const char *, CStringTranslator>(c);
     if (!addResult.second) {
         return *addResult.first;
     }
     return *addResult.first;
 }
 
 struct UCharBuffer {
     const QChar *s;
     unsigned length;
 };
 
 static inline bool equal(DOMStringImpl *string, const QChar *characters, unsigned length)
 {
     if (string->length() != length) {
         return false;
     }
 
     /* Do it 4-bytes-at-a-time on architectures where it's safe */
 
     const uint32_t *stringCharacters = reinterpret_cast<const uint32_t *>(string->unicode());
     const uint32_t *bufferCharacters = reinterpret_cast<const uint32_t *>(characters);
 
     unsigned halfLength = length >> 1;
     for (unsigned i = 0; i != halfLength; ++i) {
         if (*stringCharacters++ != *bufferCharacters++) {
             return false;
         }
     }
 
     if (length & 1 &&  *reinterpret_cast<const uint16_t *>(stringCharacters) != *reinterpret_cast<const uint16_t *>(bufferCharacters)) {
         return false;
     }
 
     return true;
 }
 
 struct UCharBufferTranslator {
     static unsigned hash(const UCharBuffer &buf)
     {
         return DOMStringImpl::computeHash(buf.s, buf.length);
     }
 
     static bool equal(DOMStringImpl *const &str, const UCharBuffer &buf)
     {
         return khtml::equal(str, buf.s, buf.length);
     }
 
     static void translate(DOMStringImpl *&location, const UCharBuffer &buf, unsigned hash)
     {
         location = new DOMStringImpl(buf.s, buf.length, hash);
     }
 };
 
 struct HashAndCharacters {
     unsigned hash;
     const QChar *characters;
     unsigned length;
 };
 
 struct HashAndCharactersTranslator {
     static unsigned hash(const HashAndCharacters &buffer)
     {
         ASSERT(buffer.hash == DOMStringImpl::computeHash(buffer.characters, buffer.length));
         return buffer.hash;
     }
 
     static bool equal(DOMStringImpl *const &string, const HashAndCharacters &buffer)
     {
         return khtml::equal(string, buffer.characters, buffer.length);
     }
 
     static void translate(DOMStringImpl *&location, const HashAndCharacters &buffer, unsigned hash)
     {
         location = new DOMStringImpl(buffer.characters, buffer.length, hash);
     }
 };
 
 DOMStringImpl *AtomicString::add(const QChar *s, int length)
 {
     if (!s) {
         return nullptr;
     }
 
     if (length == 0) {
         return DOMStringImpl::empty();
     }
 
     init();
     UCharBuffer buf = { s, static_cast<uint>(length) };
     std::pair<HashSet<DOMStringImpl *>::iterator, bool> addResult = stringTable->add<UCharBuffer, UCharBufferTranslator>(buf);
     if (!addResult.second) {
         return *addResult.first;
     }
     return *addResult.first;
 }
 
 DOMStringImpl *AtomicString::add(const QChar *s)
 {
     if (!s) {
         return nullptr;
     }
 
     int length = 0;
     while (s[length] != QChar(0)) {
         length++;
     }
 
     if (length == 0) {
         return DOMStringImpl::empty();
     }
 
     init();
     UCharBuffer buf = {s, static_cast<uint>(length)};
     std::pair<HashSet<DOMStringImpl *>::iterator, bool> addResult = stringTable->add<UCharBuffer, UCharBufferTranslator>(buf);
     if (!addResult.second) {
         return *addResult.first;
     }
     return *addResult.first;
 }
 
 DOMStringImpl *AtomicString::add(DOMStringImpl *r)
 {
     if (!r || r->m_inTable) {
         return r;
     }
 
     if (r->length() == 0) {
         return DOMStringImpl::empty();
     }
 
     init();
     DOMStringImpl *result = *stringTable->add(r).first;
     if (result == r) {
         r->m_inTable = true;
     }
     return result;
 }
 
 void AtomicString::remove(DOMStringImpl *r)
 {
     stringTable->remove(r);
 }
 
 /*DOMStringImpl* AtomicString::add(const KJS::Identifier& identifier)
 {
     if (identifier.isNull())
         return 0;
 
     UString::Rep* string = identifier.ustring().rep();
     unsigned length = string->size();
     if (!length)
         return StringImpl::empty();
 
     HashAndCharacters buffer = { string->computedHash(), string->data(), length };
     pair<HashSet<StringImpl*>::iterator, bool> addResult = stringTable->add<HashAndCharacters, HashAndCharactersTranslator>(buffer);
     if (!addResult.second)
         return *addResult.first;
     return adoptRef(*addResult.first);
 }
 
 PassRefPtr<StringImpl> AtomicString::add(const KJS::UString& ustring)
 {
     if (ustring.isNull())
         return 0;
 
     UString::Rep* string = ustring.rep();
     unsigned length = string->size();
     if (!length)
         return StringImpl::empty();
 
     HashAndCharacters buffer = { string->hash(), string->data(), length };
     pair<HashSet<StringImpl*>::iterator, bool> addResult = stringTable->add<HashAndCharacters, HashAndCharactersTranslator>(buffer);
     if (!addResult.second)
         return *addResult.first;
     return adoptRef(*addResult.first);
 }
 
 AtomicStringImpl* AtomicString::find(const KJS::Identifier& identifier)
 {
     if (identifier.isNull())
         return 0;
 
     UString::Rep* string = identifier.ustring().rep();
     unsigned length = string->size();
     if (!length)
         return static_cast<AtomicStringImpl*>(StringImpl::empty());
 
     HashAndCharacters buffer = { string->computedHash(), string->data(), length };
     HashSet<StringImpl*>::iterator iterator = stringTable->find<HashAndCharacters, HashAndCharactersTranslator>(buffer);
     if (iterator == stringTable->end())
         return 0;
     return static_cast<AtomicStringImpl*>(*iterator);
 }
 
 AtomicString::operator UString() const
 {
     return m_string;
 }*/
 
 #define DEFINE_GLOBAL(type, name, ...) \
     const type name;
 
 DEFINE_GLOBAL(AtomicString, nullAtom)
 DEFINE_GLOBAL(AtomicString, emptyAtom, "")
 DEFINE_GLOBAL(AtomicString, textAtom, "#text")
 DEFINE_GLOBAL(AtomicString, commentAtom, "#comment")
 DEFINE_GLOBAL(AtomicString, starAtom, "*")
 
 void AtomicString::init()
 {
     static bool initialized;
     if (!initialized) {
         stringTable = new HashSet<DOMStringImpl *>;
 
         // Use placement new to initialize the globals.
         /*new ((void*)&nullAtom) AtomicString;
         new ((void*)&emptyAtom) AtomicString("");
         new ((void*)&textAtom) AtomicString("#text");
         new ((void*)&commentAtom) AtomicString("#comment");
         new ((void*)&starAtom) AtomicString("*");*/
 
         initialized = true;
     }
 }
 
 }