134 lines
5.2 KiB
C++
134 lines
5.2 KiB
C++
/*
|
|
* Copyright (C) 2012-2020 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.
|
|
*
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <wtf/text/LChar.h>
|
|
|
|
namespace WTF {
|
|
|
|
enum PositiveOrNegativeNumber { PositiveNumber, NegativeNumber };
|
|
|
|
template<typename> struct IntegerToStringConversionTrait;
|
|
|
|
template<typename T, typename UnsignedIntegerType, PositiveOrNegativeNumber NumberType, typename AdditionalArgumentType>
|
|
static typename IntegerToStringConversionTrait<T>::ReturnType numberToStringImpl(UnsignedIntegerType number, AdditionalArgumentType additionalArgument)
|
|
{
|
|
LChar buf[sizeof(UnsignedIntegerType) * 3 + 1];
|
|
LChar* end = std::end(buf);
|
|
LChar* p = end;
|
|
|
|
do {
|
|
*--p = static_cast<LChar>((number % 10) + '0');
|
|
number /= 10;
|
|
} while (number);
|
|
|
|
if (NumberType == NegativeNumber)
|
|
*--p = '-';
|
|
|
|
return IntegerToStringConversionTrait<T>::flush(p, static_cast<unsigned>(end - p), additionalArgument);
|
|
}
|
|
|
|
template<typename T, typename SignedIntegerType>
|
|
inline typename IntegerToStringConversionTrait<T>::ReturnType numberToStringSigned(SignedIntegerType number, typename IntegerToStringConversionTrait<T>::AdditionalArgumentType* additionalArgument = nullptr)
|
|
{
|
|
if (number < 0)
|
|
return numberToStringImpl<T, typename std::make_unsigned_t<SignedIntegerType>, NegativeNumber>(-static_cast<typename std::make_unsigned_t<SignedIntegerType>>(number), additionalArgument);
|
|
return numberToStringImpl<T, typename std::make_unsigned_t<SignedIntegerType>, PositiveNumber>(number, additionalArgument);
|
|
}
|
|
|
|
template<typename T, typename UnsignedIntegerType>
|
|
inline typename IntegerToStringConversionTrait<T>::ReturnType numberToStringUnsigned(UnsignedIntegerType number, typename IntegerToStringConversionTrait<T>::AdditionalArgumentType* additionalArgument = nullptr)
|
|
{
|
|
return numberToStringImpl<T, UnsignedIntegerType, PositiveNumber>(number, additionalArgument);
|
|
}
|
|
|
|
template<typename CharacterType, typename UnsignedIntegerType, PositiveOrNegativeNumber NumberType>
|
|
static void writeIntegerToBufferImpl(UnsignedIntegerType number, CharacterType* destination)
|
|
{
|
|
static_assert(!std::is_same_v<bool, std::remove_cv_t<UnsignedIntegerType>>, "'bool' not supported");
|
|
LChar buf[sizeof(UnsignedIntegerType) * 3 + 1];
|
|
LChar* end = std::end(buf);
|
|
LChar* p = end;
|
|
|
|
do {
|
|
*--p = static_cast<LChar>((number % 10) + '0');
|
|
number /= 10;
|
|
} while (number);
|
|
|
|
if (NumberType == NegativeNumber)
|
|
*--p = '-';
|
|
|
|
while (p < end)
|
|
*destination++ = static_cast<CharacterType>(*p++);
|
|
}
|
|
|
|
template<typename CharacterType, typename IntegerType>
|
|
inline void writeIntegerToBuffer(IntegerType integer, CharacterType* destination)
|
|
{
|
|
static_assert(std::is_integral_v<IntegerType>);
|
|
if constexpr (std::is_same_v<IntegerType, bool>)
|
|
return writeIntegerToBufferImpl<CharacterType, uint8_t, PositiveNumber>(integer ? 1 : 0, destination);
|
|
else if constexpr (std::is_signed_v<IntegerType>) {
|
|
if (integer < 0)
|
|
return writeIntegerToBufferImpl<CharacterType, typename std::make_unsigned_t<IntegerType>, NegativeNumber>(-integer, destination);
|
|
return writeIntegerToBufferImpl<CharacterType, typename std::make_unsigned_t<IntegerType>, PositiveNumber>(integer, destination);
|
|
} else
|
|
return writeIntegerToBufferImpl<CharacterType, IntegerType, PositiveNumber>(integer, destination);
|
|
}
|
|
|
|
template<typename UnsignedIntegerType, PositiveOrNegativeNumber NumberType>
|
|
constexpr unsigned lengthOfIntegerAsStringImpl(UnsignedIntegerType number)
|
|
{
|
|
unsigned length = 0;
|
|
|
|
do {
|
|
++length;
|
|
number /= 10;
|
|
} while (number);
|
|
|
|
if (NumberType == NegativeNumber)
|
|
++length;
|
|
|
|
return length;
|
|
}
|
|
|
|
template<typename IntegerType>
|
|
constexpr unsigned lengthOfIntegerAsString(IntegerType integer)
|
|
{
|
|
static_assert(std::is_integral_v<IntegerType>);
|
|
if constexpr (std::is_same_v<IntegerType, bool>) {
|
|
UNUSED_PARAM(integer);
|
|
return 1;
|
|
}
|
|
else if constexpr (std::is_signed_v<IntegerType>) {
|
|
if (integer < 0)
|
|
return lengthOfIntegerAsStringImpl<typename std::make_unsigned_t<IntegerType>, NegativeNumber>(-integer);
|
|
return lengthOfIntegerAsStringImpl<typename std::make_unsigned_t<IntegerType>, PositiveNumber>(integer);
|
|
} else
|
|
return lengthOfIntegerAsStringImpl<IntegerType, PositiveNumber>(integer);
|
|
}
|
|
|
|
} // namespace WTF
|
|
|
|
using WTF::lengthOfIntegerAsString;
|
|
using WTF::writeIntegerToBuffer;
|