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1 /* | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 * Copyright (C) 2012 Apple Inc. All Rights Reserved. | 2 // Use of this source code is governed by a BSD-style license that can be |
3 * Copyright (C) 2012 Patrick Gansterer <paroga@paroga.com> | 3 // found in the LICENSE file. |
4 * | |
5 * This library is free software; you can redistribute it and/or | |
6 * modify it under the terms of the GNU Library General Public | |
7 * License as published by the Free Software Foundation; either | |
8 * version 2 of the License, or (at your option) any later version. | |
9 * | |
10 * This library is distributed in the hope that it will be useful, | |
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 * Library General Public License for more details. | |
14 * | |
15 * You should have received a copy of the GNU Library General Public License | |
16 * along with this library; see the file COPYING.LIB. If not, write to | |
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
18 * Boston, MA 02110-1301, USA. | |
19 * | |
20 */ | |
21 | 4 |
22 #ifndef IntegerToStringConversion_h | 5 #include "platform/wtf/text/IntegerToStringConversion.h" |
23 #define IntegerToStringConversion_h | |
24 | 6 |
25 #include "base/numerics/safe_conversions.h" | 7 // The contents of this header was moved to platform/wtf as part of |
26 #include "wtf/StdLibExtras.h" | 8 // WTF migration project. See the following post for details: |
27 #include "wtf/text/Unicode.h" | 9 // https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gY
CAAJ |
28 #include <limits> | |
29 #include <type_traits> | |
30 | |
31 namespace WTF { | |
32 | |
33 // TODO(esprehn): See if we can generalize IntToStringT in | |
34 // base/strings/string_number_conversions.cc, and use unsigned type expansion | |
35 // optimization here instead of CheckedNumeric::UnsignedAbs(). | |
36 template <typename IntegerType> | |
37 class IntegerToStringConverter { | |
38 public: | |
39 static_assert(std::is_integral<IntegerType>::value, | |
40 "IntegerType must be a type of integer."); | |
41 | |
42 explicit IntegerToStringConverter(IntegerType input) { | |
43 LChar* end = m_buffer + WTF_ARRAY_LENGTH(m_buffer); | |
44 m_begin = end; | |
45 | |
46 // We need to switch to the unsigned type when negating the value since | |
47 // abs(INT_MIN) == INT_MAX + 1. | |
48 bool isNegative = base::IsValueNegative(input); | |
49 UnsignedIntegerType value = isNegative ? 0u - input : input; | |
50 | |
51 do { | |
52 --m_begin; | |
53 DCHECK_NE(m_begin, m_buffer); | |
54 *m_begin = static_cast<LChar>((value % 10) + '0'); | |
55 value /= 10; | |
56 } while (value); | |
57 | |
58 if (isNegative) { | |
59 --m_begin; | |
60 DCHECK_NE(m_begin, m_buffer); | |
61 *m_begin = static_cast<LChar>('-'); | |
62 } | |
63 | |
64 m_length = static_cast<unsigned>(end - m_begin); | |
65 } | |
66 | |
67 const LChar* characters8() const { return m_begin; } | |
68 unsigned length() const { return m_length; } | |
69 | |
70 private: | |
71 using UnsignedIntegerType = typename std::make_unsigned<IntegerType>::type; | |
72 static const size_t kBufferSize = 3 * sizeof(UnsignedIntegerType) + | |
73 std::numeric_limits<IntegerType>::is_signed; | |
74 | |
75 LChar m_buffer[kBufferSize]; | |
76 LChar* m_begin; | |
77 unsigned m_length; | |
78 }; | |
79 | |
80 } // namespace WTF | |
81 | |
82 #endif // IntegerToStringConversion_h | |
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