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Side by Side Diff: third_party/WebKit/Source/wtf/dtoa/bignum-dtoa.h

Issue 2764243002: Move files in wtf/ to platform/wtf/ (Part 9). (Closed)
Patch Set: Rebase. Created 3 years, 9 months ago
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1 // Copyright 2010 the V8 project authors. All rights reserved. 1 // Copyright 2017 The Chromium Authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Use of this source code is governed by a BSD-style license that can be
3 // modification, are permitted provided that the following conditions are 3 // found in the LICENSE file.
4 // met:
5 //
6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided
11 // with the distribution.
12 // * Neither the name of Google Inc. nor the names of its
13 // contributors may be used to endorse or promote products derived
14 // from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 4
28 #ifndef DOUBLE_CONVERSION_BIGNUM_DTOA_H_ 5 #include "platform/wtf/dtoa/bignum-dtoa.h"
29 #define DOUBLE_CONVERSION_BIGNUM_DTOA_H_
30 6
31 #include "utils.h" 7 // The contents of this header was moved to platform/wtf as part of
32 8 // WTF migration project. See the following post for details:
33 namespace WTF { 9 // https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gY CAAJ
34
35 namespace double_conversion {
36
37 enum BignumDtoaMode {
38 // Return the shortest correct representation.
39 // For example the output of 0.299999999999999988897 is (the less accurate but
40 // correct) 0.3.
41 BIGNUM_DTOA_SHORTEST,
42 // Return a fixed number of digits after the decimal point.
43 // For instance fixed(0.1, 4) becomes 0.1000
44 // If the input number is big, the output will be big.
45 BIGNUM_DTOA_FIXED,
46 // Return a fixed number of digits, no matter what the exponent is.
47 BIGNUM_DTOA_PRECISION
48 };
49
50 // Converts the given double 'v' to ascii.
51 // The result should be interpreted as buffer * 10^(point-length).
52 // The buffer will be null-terminated.
53 //
54 // The input v must be > 0 and different from NaN, and Infinity.
55 //
56 // The output depends on the given mode:
57 // - SHORTEST: produce the least amount of digits for which the internal
58 // identity requirement is still satisfied. If the digits are printed
59 // (together with the correct exponent) then reading this number will give
60 // 'v' again. The buffer will choose the representation that is closest to
61 // 'v'. If there are two at the same distance, than the number is round up.
62 // In this mode the 'requested_digits' parameter is ignored.
63 // - FIXED: produces digits necessary to print a given number with
64 // 'requested_digits' digits after the decimal point. The produced digits
65 // might be too short in which case the caller has to fill the gaps with '0's.
66 // Example: toFixed(0.001, 5) is allowed to return buffer="1", point=-2.
67 // Halfway cases are rounded up. The call toFixed(0.15, 2) thus returns
68 // buffer="2", point=0.
69 // Note: the length of the returned buffer has no meaning wrt the significance
70 // of its digits. That is, just because it contains '0's does not mean that
71 // any other digit would not satisfy the internal identity requirement.
72 // - PRECISION: produces 'requested_digits' where the first digit is not '0'.
73 // Even though the length of produced digits usually equals
74 // 'requested_digits', the function is allowed to return fewer digits, in
75 // which case the caller has to fill the missing digits with '0's.
76 // Halfway cases are again rounded up.
77 // 'BignumDtoa' expects the given buffer to be big enough to hold all digits
78 // and a terminating null-character.
79 void BignumDtoa(double v,
80 BignumDtoaMode mode,
81 int requested_digits,
82 Vector<char> buffer,
83 int* length,
84 int* point);
85
86 } // namespace double_conversion
87
88 } // namespace WTF
89
90 #endif // DOUBLE_CONVERSION_BIGNUM_DTOA_H_
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