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

Issue 1611343002: wtf reformat test Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: pydent Created 4 years, 11 months ago
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1 // Copyright 2010 the V8 project authors. All rights reserved. 1 // Copyright 2010 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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27 27
28 #ifndef DOUBLE_CONVERSION_BIGNUM_DTOA_H_ 28 #ifndef DOUBLE_CONVERSION_BIGNUM_DTOA_H_
29 #define DOUBLE_CONVERSION_BIGNUM_DTOA_H_ 29 #define DOUBLE_CONVERSION_BIGNUM_DTOA_H_
30 30
31 #include "utils.h" 31 #include "utils.h"
32 32
33 namespace WTF { 33 namespace WTF {
34 34
35 namespace double_conversion { 35 namespace double_conversion {
36 36
37 enum BignumDtoaMode { 37 enum BignumDtoaMode {
38 // Return the shortest correct representation. 38 // Return the shortest correct representation.
39 // For example the output of 0.299999999999999988897 is (the less accura te but 39 // For example the output of 0.299999999999999988897 is (the less accurate but
40 // correct) 0.3. 40 // correct) 0.3.
41 BIGNUM_DTOA_SHORTEST, 41 BIGNUM_DTOA_SHORTEST,
42 // Return a fixed number of digits after the decimal point. 42 // Return a fixed number of digits after the decimal point.
43 // For instance fixed(0.1, 4) becomes 0.1000 43 // For instance fixed(0.1, 4) becomes 0.1000
44 // If the input number is big, the output will be big. 44 // If the input number is big, the output will be big.
45 BIGNUM_DTOA_FIXED, 45 BIGNUM_DTOA_FIXED,
46 // Return a fixed number of digits, no matter what the exponent is. 46 // Return a fixed number of digits, no matter what the exponent is.
47 BIGNUM_DTOA_PRECISION 47 BIGNUM_DTOA_PRECISION
48 }; 48 };
49 49
50 // Converts the given double 'v' to ascii. 50 // Converts the given double 'v' to ascii.
51 // The result should be interpreted as buffer * 10^(point-length). 51 // The result should be interpreted as buffer * 10^(point-length).
52 // The buffer will be null-terminated. 52 // The buffer will be null-terminated.
53 // 53 //
54 // The input v must be > 0 and different from NaN, and Infinity. 54 // The input v must be > 0 and different from NaN, and Infinity.
55 // 55 //
56 // The output depends on the given mode: 56 // The output depends on the given mode:
57 // - SHORTEST: produce the least amount of digits for which the internal 57 // - SHORTEST: produce the least amount of digits for which the internal
58 // identity requirement is still satisfied. If the digits are printed 58 // identity requirement is still satisfied. If the digits are printed
59 // (together with the correct exponent) then reading this number will give 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 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 . 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. 62 // In this mode the 'requested_digits' parameter is ignored.
63 // - FIXED: produces digits necessary to print a given number with 63 // - FIXED: produces digits necessary to print a given number with
64 // 'requested_digits' digits after the decimal point. The produced digits 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. 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. 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 67 // Halfway cases are rounded up. The call toFixed(0.15, 2) thus returns
68 // buffer="2", point=0. 68 // buffer="2", point=0.
69 // Note: the length of the returned buffer has no meaning wrt the signific ance 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 tha t 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. 71 // any other digit would not satisfy the internal identity requirement.
72 // - PRECISION: produces 'requested_digits' where the first digit is not '0 '. 72 // - PRECISION: produces 'requested_digits' where the first digit is not '0'.
73 // Even though the length of produced digits usually equals 73 // Even though the length of produced digits usually equals
74 // 'requested_digits', the function is allowed to return fewer digits, in 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. 75 // which case the caller has to fill the missing digits with '0's.
76 // Halfway cases are again rounded up. 76 // Halfway cases are again rounded up.
77 // 'BignumDtoa' expects the given buffer to be big enough to hold all digits 77 // 'BignumDtoa' expects the given buffer to be big enough to hold all digits
78 // and a terminating null-character. 78 // and a terminating null-character.
79 void BignumDtoa(double v, BignumDtoaMode mode, int requested_digits, 79 void BignumDtoa(double v,
80 Vector<char> buffer, int* length, int* point); 80 BignumDtoaMode mode,
81 int requested_digits,
82 Vector<char> buffer,
83 int* length,
84 int* point);
81 85
82 } // namespace double_conversion 86 } // namespace double_conversion
83 87
84 } // namespace WTF 88 } // namespace WTF
85 89
86 #endif // DOUBLE_CONVERSION_BIGNUM_DTOA_H_ 90 #endif // DOUBLE_CONVERSION_BIGNUM_DTOA_H_
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