1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
/*
* Copyright (C) 2012-2024 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 <array>
#include <cstdint>
#include <span>
#include <string>
#include <wtf/Forward.h>
#include <wtf/MathExtras.h>
#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)
{
std::array<LChar, sizeof(UnsignedIntegerType) * 3 + 1> buffer;
auto index = buffer.size();
do {
buffer[--index] = static_cast<LChar>((number % 10) + '0');
number /= 10;
} while (number);
if (NumberType == NegativeNumber)
buffer[--index] = '-';
return IntegerToStringConversionTrait<T>::flush(std::span { buffer }.subspan(index), 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, std::span<CharacterType> destination)
{
static_assert(!std::is_same_v<bool, std::remove_cv_t<UnsignedIntegerType>>, "'bool' not supported");
std::array<LChar, sizeof(UnsignedIntegerType) * 3 + 1> buffer;
auto index = buffer.size();
do {
buffer[--index] = static_cast<LChar>((number % 10) + '0');
number /= 10;
} while (number);
if (NumberType == NegativeNumber)
buffer[--index] = '-';
for (size_t i = 0; i < buffer.size() - index; ++i)
destination[i] = static_cast<CharacterType>(buffer[index + i]);
}
template<typename CharacterType, typename IntegerType>
inline void writeIntegerToBuffer(IntegerType integer, std::span<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>(WTF::negate(integer), destination);
return writeIntegerToBufferImpl<CharacterType, typename std::make_unsigned_t<IntegerType>, PositiveNumber>(std::make_unsigned_t<IntegerType>(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>(WTF::negate(integer));
return lengthOfIntegerAsStringImpl<typename std::make_unsigned_t<IntegerType>, PositiveNumber>(std::make_unsigned_t<IntegerType>(integer));
} else
return lengthOfIntegerAsStringImpl<IntegerType, PositiveNumber>(integer);
}
template<size_t N>
struct IntegerToStringConversionTrait<Vector<LChar, N>> {
using ReturnType = Vector<LChar, N>;
using AdditionalArgumentType = void;
static ReturnType flush(std::span<const LChar> characters, void*) { return characters; }
};
} // namespace WTF
using WTF::numberToStringSigned;
using WTF::numberToStringUnsigned;
using WTF::lengthOfIntegerAsString;
using WTF::writeIntegerToBuffer;
|
