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double-conversion-double-to-string.h (24567B)

---

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// 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.
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//
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// 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:
 // 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 = 100;

 // 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;

 // 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;

 // The maximal number of digits that are needed to emit a single in base 10.
 // A higher precision can be achieved by using more digits, but the shortest
 // accurate representation of any single will never use more digits than
 // kBase10MaximalLengthSingle.
 static const int kBase10MaximalLengthSingle = 9;

 // The length of the longest string that 'ToShortest' can produce when the
 // converter is instantiated with EcmaScript defaults (see
 // 'EcmaScriptConverter')
 // This value does not include the trailing '\0' character.
 // This amount of characters is needed for negative values that hit the
 // 'decimal_in_shortest_low' limit. For example: "-0.0000033333333333333333"
 static const int kMaxCharsEcmaScriptShortest = 25;

#if 0 // not needed for ICU
 enum Flags {
   NO_FLAGS = 0,
   EMIT_POSITIVE_EXPONENT_SIGN = 1,
   EMIT_TRAILING_DECIMAL_POINT = 2,
   EMIT_TRAILING_ZERO_AFTER_POINT = 4,
   UNIQUE_ZERO = 8,
   NO_TRAILING_ZERO = 16,
   EMIT_TRAILING_DECIMAL_POINT_IN_EXPONENTIAL = 32,
   EMIT_TRAILING_ZERO_AFTER_POINT_IN_EXPONENTIAL = 64
 };

 // 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
 //    EMIT_TRAILING_DECIMAL_POINT flag.
 //    Example: 2345.0 is converted to "2345.0".
 //  - UNIQUE_ZERO: "-0.0" is converted to "0.0".
 //  - NO_TRAILING_ZERO: Trailing zeros are removed from the fractional portion
 //    of the result in precision mode. Matches printf's %g.
 //    When EMIT_TRAILING_ZERO_AFTER_POINT is also given, one trailing zero is
 //    preserved.
 //  - EMIT_TRAILING_DECIMAL_POINT_IN_EXPONENTIAL: when the input number has
 //    exactly one significant digit and is converted into exponent form then a
 //    trailing decimal point is appended to the significand in shortest mode
 //    or in precision mode with one requested digit.
 //  - EMIT_TRAILING_ZERO_AFTER_POINT_IN_EXPONENTIAL: in addition to a trailing
 //    decimal point emits a trailing '0'-character. This flag requires the
 //    EMIT_TRAILING_DECIMAL_POINT_IN_EXPONENTIAL flag.
 //
 // Infinity symbol and nan_symbol provide the string representation for these
 // special values. If the string is nullptr 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"
 // Similarly 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.
 //
 // When converting numbers with exactly one significant digit to exponent
 // form in shortest mode or in precision mode with one requested digit, the
 // EMIT_TRAILING_DECIMAL_POINT and EMIT_TRAILING_ZERO_AFTER_POINT flags have
 // no effect. Use the EMIT_TRAILING_DECIMAL_POINT_IN_EXPONENTIAL flag to
 // append a decimal point in this case and the
 // EMIT_TRAILING_ZERO_AFTER_POINT_IN_EXPONENTIAL flag to also append a
 // '0'-character in this case.
 // Example with decimal_in_shortest_low = 0:
 //   ToShortest(0.0009) -> "9e-4"
 //     with EMIT_TRAILING_DECIMAL_POINT_IN_EXPONENTIAL deactivated.
 //   ToShortest(0.0009) -> "9.e-4"
 //     with EMIT_TRAILING_DECIMAL_POINT_IN_EXPONENTIAL activated.
 //   ToShortest(0.0009) -> "9.0e-4"
 //     with EMIT_TRAILING_DECIMAL_POINT_IN_EXPONENTIAL activated and
 //     EMIT_TRAILING_ZERO_AFTER_POINT_IN_EXPONENTIAL activated.
 //
 // 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.
 //
 // Flags: UNIQUE_ZERO and EMIT_POSITIVE_EXPONENT_SIGN.
 // Special values: "Infinity" and "NaN".
 // Lower case 'e' for exponential values.
 // decimal_in_shortest_low: -6
 // decimal_in_shortest_high: 21
 // max_leading_padding_zeroes_in_precision_mode: 6
 // max_trailing_padding_zeroes_in_precision_mode: 0
 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 deactivated:
 //   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.
 //
 // The length of the longest result is the maximum of the length of the
 // following string representations (each with possible examples):
 // - NaN and negative infinity: "NaN", "-Infinity", "-inf".
 // - -10^(decimal_in_shortest_high - 1):
 //      "-100000000000000000000", "-1000000000000000.0"
 // - the longest string in range [0; -10^decimal_in_shortest_low]. Generally,
 //   this string is 3 + kBase10MaximalLength - decimal_in_shortest_low.
 //   (Sign, '0', decimal point, padding zeroes for decimal_in_shortest_low,
 //   and the significant digits).
 //      "-0.0000033333333333333333", "-0.0012345678901234567"
 // - the longest exponential representation. (A negative number with
 //   kBase10MaximalLength significant digits).
 //      "-1.7976931348623157e+308", "-1.7976931348623157E308"
 // In addition, the buffer must be able to hold the trailing '\0' character.
 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 for non-special values never
 // contains more than
 //  1 + kMaxFixedDigitsBeforePoint + 1 + kMaxFixedDigitsAfterPoint characters
 // (one additional character for the sign, and one for the decimal point).
 // In addition, the buffer must be able to hold the trailing '\0' character.
 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 never contains 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).
 // In addition, the buffer must be able to hold the trailing '\0' character.
 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"
 // Similarly 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 never contains more than
 // kMaxPrecisionDigits + 7 characters (the sign, the decimal point, the
 // exponent character, the exponent's sign, and at most 3 exponent digits).
 // In addition, the buffer must be able to hold the trailing '\0' character.
 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
 };

 // 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 nullptr 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