Restoring authorship annotation for <mcheshkov@yandex-team.ru>. Commit 2 of 2.

1 files changed, 419 insertions, 419 deletions

diff --git a/contrib/libs/icu/i18n/double-conversion-double-to-string.h b/contrib/libs/icu/i18n/double-conversion-double-to-string.h
index 9e45fc7a5e..27bd867848 100644
--- a/contrib/libs/icu/i18n/double-conversion-double-to-string.h
+++ b/contrib/libs/icu/i18n/double-conversion-double-to-string.h
@@ -1,419 +1,419 @@
-// © 2018 and later: Unicode, Inc. and others. 
-// License & terms of use: http://www.unicode.org/copyright.html 
-// 
-// From the double-conversion library. Original license: 
-// 
-// Copyright 2012 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. 
- 
-// ICU PATCH: ifdef around UCONFIG_NO_FORMATTING 
-#include "unicode/utypes.h" 
-#if !UCONFIG_NO_FORMATTING 
- 
-#ifndef DOUBLE_CONVERSION_DOUBLE_TO_STRING_H_ 
-#define DOUBLE_CONVERSION_DOUBLE_TO_STRING_H_ 
- 
-// ICU PATCH: Customize header file paths for ICU. 
- 
-#include "double-conversion-utils.h" 
- 
-// ICU PATCH: Wrap in ICU namespace 
-U_NAMESPACE_BEGIN 
- 
-namespace double_conversion { 
- 
-class DoubleToStringConverter { 
- public: 
-#if 0 // not needed for ICU 
-  // 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. 
-  // 
-  // The min_exponent_width is used for exponential representations. 
-  // The converter adds leading '0's to the exponent until the exponent 
-  // is at least min_exponent_width digits long. 
-  // The min_exponent_width is clamped to 5. 
-  // As such, the exponent may never have more than 5 digits in total. 
-  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, 
-                          int min_exponent_width = 0) 
-      : 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), 
-        min_exponent_width_(min_exponent_width) { 
-    // When 'trailing zero after the point' is set, then 'trailing point' 
-    // must be set too. 
-    DOUBLE_CONVERSION_ASSERT(((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 { 
-    return ToShortestIeeeNumber(value, result_builder, SHORTEST); 
-  } 
- 
-  // Same as ToShortest, but for single-precision floats. 
-  bool ToShortestSingle(float value, StringBuilder* result_builder) const { 
-    return ToShortestIeeeNumber(value, result_builder, SHORTEST_SINGLE); 
-  } 
- 
- 
-  // 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; 
-#endif // not needed for ICU 
- 
-  enum DtoaMode { 
-    // Produce the shortest correct representation. 
-    // For example the output of 0.299999999999999988897 is (the less accurate 
-    // but correct) 0.3. 
-    SHORTEST, 
-    // Same as SHORTEST, but for single-precision floats. 
-    SHORTEST_SINGLE, 
-    // 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 digit characters. 'v' must not be NaN, 
-  // +Infinity, or -Infinity. In SHORTEST_SINGLE-mode this restriction also 
-  // applies to 'v' after it has been casted to a single-precision float. That 
-  // is, in this mode static_cast<float>(v) must not be NaN, +Infinity or 
-  // -Infinity. 
-  // 
-  // The result should be interpreted as buffer * 10^(point-length). 
-  // 
-  // The digits are written to the buffer in the platform's charset, which is 
-  // often UTF-8 (with ASCII-range digits) but may be another charset, such 
-  // as EBCDIC. 
-  // 
-  // 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. 
-  //  - SHORTEST_SINGLE: same as SHORTEST but with single-precision. 
-  //  - 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 and the padding-zeroes limit the size of the 
-  // output. Don't forget the decimal point, the exponent character and the 
-  // terminating null-character when computing the maximal output size. 
-  // The given length is only used in debug mode to ensure the buffer is big 
-  // enough. 
-  // ICU PATCH: Export this as U_I18N_API for unit tests. 
-  static void U_I18N_API DoubleToAscii(double v, 
-                            DtoaMode mode, 
-                            int requested_digits, 
-                            char* buffer, 
-                            int buffer_length, 
-                            bool* sign, 
-                            int* length, 
-                            int* point); 
- 
-#if 0 // not needed for ICU 
- private: 
-  // Implementation for ToShortest and ToShortestSingle. 
-  bool ToShortestIeeeNumber(double value, 
-                            StringBuilder* result_builder, 
-                            DtoaMode mode) const; 
- 
-  // 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_; 
-  const int min_exponent_width_; 
-#endif // not needed for ICU 
- 
-  DOUBLE_CONVERSION_DISALLOW_IMPLICIT_CONSTRUCTORS(DoubleToStringConverter); 
-}; 
- 
-}  // namespace double_conversion 
- 
-// ICU PATCH: Close ICU namespace 
-U_NAMESPACE_END 
- 
-#endif  // DOUBLE_CONVERSION_DOUBLE_TO_STRING_H_ 
-#endif // ICU PATCH: close #if !UCONFIG_NO_FORMATTING 
+// © 2018 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+//
+// From the double-conversion library. Original license:
+//
+// Copyright 2012 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.
+
+// ICU PATCH: ifdef around UCONFIG_NO_FORMATTING
+#include "unicode/utypes.h"
+#if !UCONFIG_NO_FORMATTING
+
+#ifndef DOUBLE_CONVERSION_DOUBLE_TO_STRING_H_
+#define DOUBLE_CONVERSION_DOUBLE_TO_STRING_H_
+
+// ICU PATCH: Customize header file paths for ICU.
+
+#include "double-conversion-utils.h"
+
+// ICU PATCH: Wrap in ICU namespace
+U_NAMESPACE_BEGIN
+
+namespace double_conversion {
+
+class DoubleToStringConverter {
+ public:
+#if 0 // not needed for ICU
+  // 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.
+  //
+  // The min_exponent_width is used for exponential representations.
+  // The converter adds leading '0's to the exponent until the exponent
+  // is at least min_exponent_width digits long.
+  // The min_exponent_width is clamped to 5.
+  // As such, the exponent may never have more than 5 digits in total.
+  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,
+                          int min_exponent_width = 0)
+      : 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),
+        min_exponent_width_(min_exponent_width) {
+    // When 'trailing zero after the point' is set, then 'trailing point'
+    // must be set too.
+    DOUBLE_CONVERSION_ASSERT(((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 {
+    return ToShortestIeeeNumber(value, result_builder, SHORTEST);
+  }
+
+  // Same as ToShortest, but for single-precision floats.
+  bool ToShortestSingle(float value, StringBuilder* result_builder) const {
+    return ToShortestIeeeNumber(value, result_builder, SHORTEST_SINGLE);
+  }
+
+
+  // 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;
+#endif // not needed for ICU
+
+  enum DtoaMode {
+    // Produce the shortest correct representation.
+    // For example the output of 0.299999999999999988897 is (the less accurate
+    // but correct) 0.3.
+    SHORTEST,
+    // Same as SHORTEST, but for single-precision floats.
+    SHORTEST_SINGLE,
+    // 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 digit characters. 'v' must not be NaN,
+  // +Infinity, or -Infinity. In SHORTEST_SINGLE-mode this restriction also
+  // applies to 'v' after it has been casted to a single-precision float. That
+  // is, in this mode static_cast<float>(v) must not be NaN, +Infinity or
+  // -Infinity.
+  //
+  // The result should be interpreted as buffer * 10^(point-length).
+  //
+  // The digits are written to the buffer in the platform's charset, which is
+  // often UTF-8 (with ASCII-range digits) but may be another charset, such
+  // as EBCDIC.
+  //
+  // 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.
+  //  - SHORTEST_SINGLE: same as SHORTEST but with single-precision.
+  //  - 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 and the padding-zeroes limit the size of the
+  // output. Don't forget the decimal point, the exponent character and the
+  // terminating null-character when computing the maximal output size.
+  // The given length is only used in debug mode to ensure the buffer is big
+  // enough.
+  // ICU PATCH: Export this as U_I18N_API for unit tests.
+  static void U_I18N_API DoubleToAscii(double v,
+                            DtoaMode mode,
+                            int requested_digits,
+                            char* buffer,
+                            int buffer_length,
+                            bool* sign,
+                            int* length,
+                            int* point);
+
+#if 0 // not needed for ICU
+ private:
+  // Implementation for ToShortest and ToShortestSingle.
+  bool ToShortestIeeeNumber(double value,
+                            StringBuilder* result_builder,
+                            DtoaMode mode) const;
+
+  // 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_;
+  const int min_exponent_width_;
+#endif // not needed for ICU
+
+  DOUBLE_CONVERSION_DISALLOW_IMPLICIT_CONSTRUCTORS(DoubleToStringConverter);
+};
+
+}  // namespace double_conversion
+
+// ICU PATCH: Close ICU namespace
+U_NAMESPACE_END
+
+#endif  // DOUBLE_CONVERSION_DOUBLE_TO_STRING_H_
+#endif // ICU PATCH: close #if !UCONFIG_NO_FORMATTING