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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** No Commercial Usage
**
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
**
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**************************************************************************/
// Copyright (c) 2008 Roberto Raggi <roberto.raggi@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef CPLUSPLUS_LITERALTABLE_H
#define CPLUSPLUS_LITERALTABLE_H
#include "CPlusPlusForwardDeclarations.h"
#include <cstring>
namespace CPlusPlus {
template <typename _Literal>
class LiteralTable
{
LiteralTable(const LiteralTable &other);
void operator =(const LiteralTable &other);
public:
typedef _Literal *const *iterator;
public:
LiteralTable()
: _literals(0),
_buckets(0),
_allocatedLiterals(0),
_literalCount(-1),
_allocatedBuckets(0)
{ }
~LiteralTable()
{
reset();
}
void reset()
{
if (_literals) {
_Literal **lastLiteral = _literals + _literalCount + 1;
for (_Literal **it = _literals; it != lastLiteral; ++it)
delete *it;
std::free(_literals);
}
if (_buckets)
std::free(_buckets);
_literals = 0;
_buckets = 0;
_allocatedLiterals = 0;
_literalCount = -1;
_allocatedBuckets = 0;
}
bool empty() const
{ return _literalCount == -1; }
unsigned size() const
{ return _literalCount + 1; }
const _Literal *at(unsigned index) const
{ return _literals[index]; }
iterator begin() const
{ return _literals; }
iterator end() const
{ return _literals + _literalCount + 1; }
const _Literal *findLiteral(const char *chars, unsigned size) const
{
if (_buckets) {
unsigned h = _Literal::hashCode(chars, size);
_Literal *literal = _buckets[h % _allocatedBuckets];
for (; literal; literal = static_cast<_Literal *>(literal->_next)) {
if (literal->size() == size && ! std::strncmp(literal->chars(), chars, size))
return literal;
}
}
return 0;
}
const _Literal *findOrInsertLiteral(const char *chars, unsigned size)
{
if (_buckets) {
unsigned h = _Literal::hashCode(chars, size);
_Literal *literal = _buckets[h % _allocatedBuckets];
for (; literal; literal = static_cast<_Literal *>(literal->_next)) {
if (literal->size() == size && ! std::strncmp(literal->chars(), chars, size))
return literal;
}
}
_Literal *literal = new _Literal(chars, size);
if (++_literalCount == _allocatedLiterals) {
if (! _allocatedLiterals)
_allocatedLiterals = 4;
else
_allocatedLiterals <<= 1;
_literals = (_Literal **) std::realloc(_literals, sizeof(_Literal *) * _allocatedLiterals);
}
_literals[_literalCount] = literal;
if (! _buckets || _literalCount * 5 >= _allocatedBuckets * 3)
rehash();
else {
unsigned h = literal->hashCode() % _allocatedBuckets;
literal->_next = _buckets[h];
_buckets[h] = literal;
}
return literal;
}
protected:
void rehash()
{
if (_buckets)
std::free(_buckets);
if (! _allocatedBuckets)
_allocatedBuckets = 4;
else
_allocatedBuckets <<= 1;
_buckets = (_Literal **) std::calloc(_allocatedBuckets, sizeof(_Literal *));
_Literal **lastLiteral = _literals + (_literalCount + 1);
for (_Literal **it = _literals; it != lastLiteral; ++it) {
_Literal *literal = *it;
unsigned h = literal->hashCode() % _allocatedBuckets;
literal->_next = _buckets[h];
_buckets[h] = literal;
}
}
protected:
_Literal **_literals;
_Literal **_buckets;
int _allocatedLiterals;
int _literalCount;
int _allocatedBuckets;
};
} // namespace CPlusPlus
#endif // CPLUSPLUS_LITERALTABLE_H
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