Index: third_party/WebKit/Source/wtf/dtoa/double-conversion.h |
diff --git a/third_party/WebKit/Source/wtf/dtoa/double-conversion.h b/third_party/WebKit/Source/wtf/dtoa/double-conversion.h |
index 17ad7c0df8fd128a0833b5b93a4e7f21098ec574..3d7490a0d54038b44b4f1b1eaa41e71f14307d1e 100644 |
--- a/third_party/WebKit/Source/wtf/dtoa/double-conversion.h |
+++ b/third_party/WebKit/Source/wtf/dtoa/double-conversion.h |
@@ -1,377 +1,9 @@ |
-// Copyright 2010 the V8 project authors. All rights reserved. |
-// Redistribution and use in source and binary forms, with or without |
-// modification, are permitted provided that the following conditions are |
-// met: |
-// |
-// * Redistributions of source code must retain the above copyright |
-// notice, this list of conditions and the following disclaimer. |
-// * Redistributions in binary form must reproduce the above |
-// copyright notice, this list of conditions and the following |
-// disclaimer in the documentation and/or other materials provided |
-// with the distribution. |
-// * Neither the name of Google Inc. nor the names of its |
-// contributors may be used to endorse or promote products derived |
-// from this software without specific prior written permission. |
-// |
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+// Copyright 2017 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
-#ifndef DOUBLE_CONVERSION_DOUBLE_CONVERSION_H_ |
-#define DOUBLE_CONVERSION_DOUBLE_CONVERSION_H_ |
+#include "platform/wtf/dtoa/double-conversion.h" |
-#include "wtf/dtoa/utils.h" |
- |
-namespace WTF { |
- |
-namespace double_conversion { |
- |
-class DoubleToStringConverter { |
- public: |
- // When calling ToFixed with a double > 10^kMaxFixedDigitsBeforePoint |
- // or a requested_digits parameter > kMaxFixedDigitsAfterPoint then the |
- // function returns false. |
- static const int kMaxFixedDigitsBeforePoint = 60; |
- static const int kMaxFixedDigitsAfterPoint = 60; |
- |
- // When calling ToExponential with a requested_digits |
- // parameter > kMaxExponentialDigits then the function returns false. |
- static const int kMaxExponentialDigits = 120; |
- |
- // When calling ToPrecision with a requested_digits |
- // parameter < kMinPrecisionDigits or requested_digits > kMaxPrecisionDigits |
- // then the function returns false. |
- static const int kMinPrecisionDigits = 1; |
- static const int kMaxPrecisionDigits = 120; |
- |
- enum Flags { |
- NO_FLAGS = 0, |
- EMIT_POSITIVE_EXPONENT_SIGN = 1, |
- EMIT_TRAILING_DECIMAL_POINT = 2, |
- EMIT_TRAILING_ZERO_AFTER_POINT = 4, |
- UNIQUE_ZERO = 8 |
- }; |
- |
- // Flags should be a bit-or combination of the possible Flags-enum. |
- // - NO_FLAGS: no special flags. |
- // - EMIT_POSITIVE_EXPONENT_SIGN: when the number is converted into exponent |
- // form, emits a '+' for positive exponents. Example: 1.2e+2. |
- // - EMIT_TRAILING_DECIMAL_POINT: when the input number is an integer and is |
- // converted into decimal format then a trailing decimal point is appended. |
- // Example: 2345.0 is converted to "2345.". |
- // - EMIT_TRAILING_ZERO_AFTER_POINT: in addition to a trailing decimal point |
- // emits a trailing '0'-character. This flag requires the |
- // EXMIT_TRAILING_DECIMAL_POINT flag. |
- // Example: 2345.0 is converted to "2345.0". |
- // - UNIQUE_ZERO: "-0.0" is converted to "0.0". |
- // |
- // Infinity symbol and nan_symbol provide the string representation for these |
- // special values. If the string is NULL and the special value is encountered |
- // then the conversion functions return false. |
- // |
- // The exponent_character is used in exponential representations. It is |
- // usually 'e' or 'E'. |
- // |
- // When converting to the shortest representation the converter will |
- // represent input numbers in decimal format if they are in the interval |
- // [10^decimal_in_shortest_low; 10^decimal_in_shortest_high[ |
- // (lower boundary included, greater boundary excluded). |
- // Example: with decimal_in_shortest_low = -6 and |
- // decimal_in_shortest_high = 21: |
- // ToShortest(0.000001) -> "0.000001" |
- // ToShortest(0.0000001) -> "1e-7" |
- // ToShortest(111111111111111111111.0) -> "111111111111111110000" |
- // ToShortest(100000000000000000000.0) -> "100000000000000000000" |
- // ToShortest(1111111111111111111111.0) -> "1.1111111111111111e+21" |
- // |
- // When converting to precision mode the converter may add |
- // max_leading_padding_zeroes before returning the number in exponential |
- // format. |
- // Example with max_leading_padding_zeroes_in_precision_mode = 6. |
- // ToPrecision(0.0000012345, 2) -> "0.0000012" |
- // ToPrecision(0.00000012345, 2) -> "1.2e-7" |
- // Similarily the converter may add up to |
- // max_trailing_padding_zeroes_in_precision_mode in precision mode to avoid |
- // returning an exponential representation. A zero added by the |
- // EMIT_TRAILING_ZERO_AFTER_POINT flag is counted for this limit. |
- // Examples for max_trailing_padding_zeroes_in_precision_mode = 1: |
- // ToPrecision(230.0, 2) -> "230" |
- // ToPrecision(230.0, 2) -> "230." with EMIT_TRAILING_DECIMAL_POINT. |
- // ToPrecision(230.0, 2) -> "2.3e2" with EMIT_TRAILING_ZERO_AFTER_POINT. |
- DoubleToStringConverter(int flags, |
- const char* infinity_symbol, |
- const char* nan_symbol, |
- char exponent_character, |
- int decimal_in_shortest_low, |
- int decimal_in_shortest_high, |
- int max_leading_padding_zeroes_in_precision_mode, |
- int max_trailing_padding_zeroes_in_precision_mode) |
- : flags_(flags), |
- infinity_symbol_(infinity_symbol), |
- nan_symbol_(nan_symbol), |
- exponent_character_(exponent_character), |
- decimal_in_shortest_low_(decimal_in_shortest_low), |
- decimal_in_shortest_high_(decimal_in_shortest_high), |
- max_leading_padding_zeroes_in_precision_mode_( |
- max_leading_padding_zeroes_in_precision_mode), |
- max_trailing_padding_zeroes_in_precision_mode_( |
- max_trailing_padding_zeroes_in_precision_mode) { |
- // When 'trailing zero after the point' is set, then 'trailing point' |
- // must be set too. |
- DCHECK(((flags & EMIT_TRAILING_DECIMAL_POINT) != 0) || |
- !((flags & EMIT_TRAILING_ZERO_AFTER_POINT) != 0)); |
- } |
- |
- // Returns a converter following the EcmaScript specification. |
- static const DoubleToStringConverter& EcmaScriptConverter(); |
- |
- // Computes the shortest string of digits that correctly represent the input |
- // number. Depending on decimal_in_shortest_low and decimal_in_shortest_high |
- // (see constructor) it then either returns a decimal representation, or an |
- // exponential representation. |
- // Example with decimal_in_shortest_low = -6, |
- // decimal_in_shortest_high = 21, |
- // EMIT_POSITIVE_EXPONENT_SIGN activated, and |
- // EMIT_TRAILING_DECIMAL_POINT deactived: |
- // ToShortest(0.000001) -> "0.000001" |
- // ToShortest(0.0000001) -> "1e-7" |
- // ToShortest(111111111111111111111.0) -> "111111111111111110000" |
- // ToShortest(100000000000000000000.0) -> "100000000000000000000" |
- // ToShortest(1111111111111111111111.0) -> "1.1111111111111111e+21" |
- // |
- // Note: the conversion may round the output if the returned string |
- // is accurate enough to uniquely identify the input-number. |
- // For example the most precise representation of the double 9e59 equals |
- // "899999999999999918767229449717619953810131273674690656206848", but |
- // the converter will return the shorter (but still correct) "9e59". |
- // |
- // Returns true if the conversion succeeds. The conversion always succeeds |
- // except when the input value is special and no infinity_symbol or |
- // nan_symbol has been given to the constructor. |
- bool ToShortest(double value, StringBuilder* result_builder) const; |
- |
- // Computes a decimal representation with a fixed number of digits after the |
- // decimal point. The last emitted digit is rounded. |
- // |
- // Examples: |
- // ToFixed(3.12, 1) -> "3.1" |
- // ToFixed(3.1415, 3) -> "3.142" |
- // ToFixed(1234.56789, 4) -> "1234.5679" |
- // ToFixed(1.23, 5) -> "1.23000" |
- // ToFixed(0.1, 4) -> "0.1000" |
- // ToFixed(1e30, 2) -> "1000000000000000019884624838656.00" |
- // ToFixed(0.1, 30) -> "0.100000000000000005551115123126" |
- // ToFixed(0.1, 17) -> "0.10000000000000001" |
- // |
- // If requested_digits equals 0, then the tail of the result depends on |
- // the EMIT_TRAILING_DECIMAL_POINT and EMIT_TRAILING_ZERO_AFTER_POINT. |
- // Examples, for requested_digits == 0, |
- // let EMIT_TRAILING_DECIMAL_POINT and EMIT_TRAILING_ZERO_AFTER_POINT be |
- // - false and false: then 123.45 -> 123 |
- // 0.678 -> 1 |
- // - true and false: then 123.45 -> 123. |
- // 0.678 -> 1. |
- // - true and true: then 123.45 -> 123.0 |
- // 0.678 -> 1.0 |
- // |
- // Returns true if the conversion succeeds. The conversion always succeeds |
- // except for the following cases: |
- // - the input value is special and no infinity_symbol or nan_symbol has |
- // been provided to the constructor, |
- // - 'value' > 10^kMaxFixedDigitsBeforePoint, or |
- // - 'requested_digits' > kMaxFixedDigitsAfterPoint. |
- // The last two conditions imply that the result will never contain more than |
- // 1 + kMaxFixedDigitsBeforePoint + 1 + kMaxFixedDigitsAfterPoint characters |
- // (one additional character for the sign, and one for the decimal point). |
- bool ToFixed(double value, |
- int requested_digits, |
- StringBuilder* result_builder) const; |
- |
- // Computes a representation in exponential format with requested_digits |
- // after the decimal point. The last emitted digit is rounded. |
- // If requested_digits equals -1, then the shortest exponential representation |
- // is computed. |
- // |
- // Examples with EMIT_POSITIVE_EXPONENT_SIGN deactivated, and |
- // exponent_character set to 'e'. |
- // ToExponential(3.12, 1) -> "3.1e0" |
- // ToExponential(5.0, 3) -> "5.000e0" |
- // ToExponential(0.001, 2) -> "1.00e-3" |
- // ToExponential(3.1415, -1) -> "3.1415e0" |
- // ToExponential(3.1415, 4) -> "3.1415e0" |
- // ToExponential(3.1415, 3) -> "3.142e0" |
- // ToExponential(123456789000000, 3) -> "1.235e14" |
- // ToExponential(1000000000000000019884624838656.0, -1) -> "1e30" |
- // ToExponential(1000000000000000019884624838656.0, 32) -> |
- // "1.00000000000000001988462483865600e30" |
- // ToExponential(1234, 0) -> "1e3" |
- // |
- // Returns true if the conversion succeeds. The conversion always succeeds |
- // except for the following cases: |
- // - the input value is special and no infinity_symbol or nan_symbol has |
- // been provided to the constructor, |
- // - 'requested_digits' > kMaxExponentialDigits. |
- // The last condition implies that the result will never contain more than |
- // kMaxExponentialDigits + 8 characters (the sign, the digit before the |
- // decimal point, the decimal point, the exponent character, the |
- // exponent's sign, and at most 3 exponent digits). |
- bool ToExponential(double value, |
- int requested_digits, |
- StringBuilder* result_builder) const; |
- |
- // Computes 'precision' leading digits of the given 'value' and returns them |
- // either in exponential or decimal format, depending on |
- // max_{leading|trailing}_padding_zeroes_in_precision_mode (given to the |
- // constructor). |
- // The last computed digit is rounded. |
- // |
- // Example with max_leading_padding_zeroes_in_precision_mode = 6. |
- // ToPrecision(0.0000012345, 2) -> "0.0000012" |
- // ToPrecision(0.00000012345, 2) -> "1.2e-7" |
- // Similarily the converter may add up to |
- // max_trailing_padding_zeroes_in_precision_mode in precision mode to avoid |
- // returning an exponential representation. A zero added by the |
- // EMIT_TRAILING_ZERO_AFTER_POINT flag is counted for this limit. |
- // Examples for max_trailing_padding_zeroes_in_precision_mode = 1: |
- // ToPrecision(230.0, 2) -> "230" |
- // ToPrecision(230.0, 2) -> "230." with EMIT_TRAILING_DECIMAL_POINT. |
- // ToPrecision(230.0, 2) -> "2.3e2" with EMIT_TRAILING_ZERO_AFTER_POINT. |
- // Examples for max_trailing_padding_zeroes_in_precision_mode = 3, and no |
- // EMIT_TRAILING_ZERO_AFTER_POINT: |
- // ToPrecision(123450.0, 6) -> "123450" |
- // ToPrecision(123450.0, 5) -> "123450" |
- // ToPrecision(123450.0, 4) -> "123500" |
- // ToPrecision(123450.0, 3) -> "123000" |
- // ToPrecision(123450.0, 2) -> "1.2e5" |
- // |
- // Returns true if the conversion succeeds. The conversion always succeeds |
- // except for the following cases: |
- // - the input value is special and no infinity_symbol or nan_symbol has |
- // been provided to the constructor, |
- // - precision < kMinPericisionDigits |
- // - precision > kMaxPrecisionDigits |
- // The last condition implies that the result will never contain more than |
- // kMaxPrecisionDigits + 7 characters (the sign, the decimal point, the |
- // exponent character, the exponent's sign, and at most 3 exponent digits). |
- bool ToPrecision(double value, |
- int precision, |
- StringBuilder* result_builder) const; |
- |
- enum DtoaMode { |
- // Produce the shortest correct representation. |
- // For example the output of 0.299999999999999988897 is (the less accurate |
- // but correct) 0.3. |
- SHORTEST, |
- // Produce a fixed number of digits after the decimal point. |
- // For instance fixed(0.1, 4) becomes 0.1000 |
- // If the input number is big, the output will be big. |
- FIXED, |
- // Fixed number of digits (independent of the decimal point). |
- PRECISION |
- }; |
- |
- // The maximal number of digits that are needed to emit a double in base 10. |
- // A higher precision can be achieved by using more digits, but the shortest |
- // accurate representation of any double will never use more digits than |
- // kBase10MaximalLength. |
- // Note that DoubleToAscii null-terminates its input. So the given buffer |
- // should be at least kBase10MaximalLength + 1 characters long. |
- static const int kBase10MaximalLength = 17; |
- |
- // Converts the given double 'v' to ascii. |
- // The result should be interpreted as buffer * 10^(point-length). |
- // |
- // The output depends on the given mode: |
- // - SHORTEST: produce the least amount of digits for which the internal |
- // identity requirement is still satisfied. If the digits are printed |
- // (together with the correct exponent) then reading this number will give |
- // 'v' again. The buffer will choose the representation that is closest to |
- // 'v'. If there are two at the same distance, than the one farther away |
- // from 0 is chosen (halfway cases - ending with 5 - are rounded up). |
- // In this mode the 'requested_digits' parameter is ignored. |
- // - FIXED: produces digits necessary to print a given number with |
- // 'requested_digits' digits after the decimal point. The produced digits |
- // might be too short in which case the caller has to fill the remainder |
- // with '0's. |
- // Example: toFixed(0.001, 5) is allowed to return buffer="1", point=-2. |
- // Halfway cases are rounded towards +/-Infinity (away from 0). The call |
- // toFixed(0.15, 2) thus returns buffer="2", point=0. |
- // The returned buffer may contain digits that would be truncated from the |
- // shortest representation of the input. |
- // - PRECISION: produces 'requested_digits' where the first digit is not '0'. |
- // Even though the length of produced digits usually equals |
- // 'requested_digits', the function is allowed to return fewer digits, in |
- // which case the caller has to fill the missing digits with '0's. |
- // Halfway cases are again rounded away from 0. |
- // DoubleToAscii expects the given buffer to be big enough to hold all |
- // digits and a terminating null-character. In SHORTEST-mode it expects a |
- // buffer of at least kBase10MaximalLength + 1. In all other modes the |
- // requested_digits parameter (+ 1 for the null-character) limits the size of |
- // the output. The given length is only used in debug mode to ensure the |
- // buffer is big enough. |
- static void DoubleToAscii(double v, |
- DtoaMode mode, |
- int requested_digits, |
- char* buffer, |
- int buffer_length, |
- bool* sign, |
- int* length, |
- int* point); |
- |
- private: |
- // If the value is a special value (NaN or Infinity) constructs the |
- // corresponding string using the configured infinity/nan-symbol. |
- // If either of them is NULL or the value is not special then the |
- // function returns false. |
- bool HandleSpecialValues(double value, StringBuilder* result_builder) const; |
- // Constructs an exponential representation (i.e. 1.234e56). |
- // The given exponent assumes a decimal point after the first decimal digit. |
- void CreateExponentialRepresentation(const char* decimal_digits, |
- int length, |
- int exponent, |
- StringBuilder* result_builder) const; |
- // Creates a decimal representation (i.e 1234.5678). |
- void CreateDecimalRepresentation(const char* decimal_digits, |
- int length, |
- int decimal_point, |
- int digits_after_point, |
- StringBuilder* result_builder) const; |
- |
- const int flags_; |
- const char* const infinity_symbol_; |
- const char* const nan_symbol_; |
- const char exponent_character_; |
- const int decimal_in_shortest_low_; |
- const int decimal_in_shortest_high_; |
- const int max_leading_padding_zeroes_in_precision_mode_; |
- const int max_trailing_padding_zeroes_in_precision_mode_; |
- |
- DISALLOW_IMPLICIT_CONSTRUCTORS(DoubleToStringConverter); |
-}; |
- |
-class StringToDoubleConverter { |
- public: |
- // Performs the conversion. |
- // The output parameter 'processed_characters_count' is set to the number |
- // of characters that have been processed to read the number. |
- static double StringToDouble(const char* buffer, |
- size_t length, |
- size_t* processed_characters_count); |
- |
- private: |
- DISALLOW_IMPLICIT_CONSTRUCTORS(StringToDoubleConverter); |
-}; |
- |
-} // namespace double_conversion |
- |
-} // namespace WTF |
- |
-#endif // DOUBLE_CONVERSION_DOUBLE_CONVERSION_H_ |
+// The contents of this header was moved to platform/wtf as part of |
+// WTF migration project. See the following post for details: |
+// https://groups.google.com/a/chromium.org/d/msg/blink-dev/tLdAZCTlcAA/bYXVT8gYCAAJ |