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/*
* Copyright (C) 2012 Apple Inc. All Rights Reserved.
* Copyright (C) 2012 Patrick Gansterer <paroga@paroga.com>
*
* 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.
*
*/
#ifndef IntegerToStringConversion_h
#define IntegerToStringConversion_h
#include <wtf/text/StringBuilder.h>
#include <wtf/text/StringImpl.h>
namespace WTF {
enum PositiveOrNegativeNumber {
PositiveNumber,
NegativeNumber
};
template<typename T> struct ConversionTrait;
template<> struct ConversionTrait<String> {
typedef PassRefPtr<StringImpl> ReturnType;
typedef void AdditionalArgumentType;
static inline ReturnType flush(LChar* characters, unsigned length, void*) { return StringImpl::create(characters, length); }
};
template<> struct ConversionTrait<StringBuilder> {
typedef void ReturnType;
typedef StringBuilder AdditionalArgumentType;
static inline ReturnType flush(LChar* characters, unsigned length, StringBuilder* stringBuilder) { stringBuilder->append(characters, length); }
};
template<typename T> struct UnsignedIntegerTrait;
template<> struct UnsignedIntegerTrait<int> {
typedef unsigned int Type;
};
template<> struct UnsignedIntegerTrait<long> {
typedef unsigned long Type;
};
template<> struct UnsignedIntegerTrait<long long> {
typedef unsigned long long Type;
};
template<typename T, typename UnsignedIntegerType, PositiveOrNegativeNumber NumberType>
static typename ConversionTrait<T>::ReturnType numberToStringImpl(UnsignedIntegerType number, typename ConversionTrait<T>::AdditionalArgumentType* additionalArgument)
{
LChar buf[sizeof(UnsignedIntegerType) * 3 + 1];
LChar* end = buf + WTF_ARRAY_LENGTH(buf);
LChar* p = end;
do {
*--p = static_cast<LChar>((number % 10) + '0');
number /= 10;
} while (number);
if (NumberType == NegativeNumber)
*--p = '-';
return ConversionTrait<T>::flush(p, static_cast<unsigned>(end - p), additionalArgument);
}
template<typename T, typename SignedIntegerType>
inline typename ConversionTrait<T>::ReturnType numberToStringSigned(SignedIntegerType number, typename ConversionTrait<T>::AdditionalArgumentType* additionalArgument = 0)
{
if (number < 0)
return numberToStringImpl<T, typename UnsignedIntegerTrait<SignedIntegerType>::Type, NegativeNumber>(-number, additionalArgument);
return numberToStringImpl<T, typename UnsignedIntegerTrait<SignedIntegerType>::Type, PositiveNumber>(number, additionalArgument);
}
template<typename T, typename UnsignedIntegerType>
inline typename ConversionTrait<T>::ReturnType numberToStringUnsigned(UnsignedIntegerType number, typename ConversionTrait<T>::AdditionalArgumentType* additionalArgument = 0)
{
return numberToStringImpl<T, UnsignedIntegerType, PositiveNumber>(number, additionalArgument);
}
} // namespace WTF
#endif // IntegerToStringConversion_h
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