text: // 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.
  
  #ifndef DOUBLE_CONVERSION_BIGNUM_DTOA_H_
  #define DOUBLE_CONVERSION_BIGNUM_DTOA_H_
  
  #include "utils.h"
  
  namespace double_conversion {
  
  enum BignumDtoaMode {
    // Return the shortest correct representation.
    // For example the output of 0.299999999999999988897 is (the less accurate but
    // correct) 0.3.
    BIGNUM_DTOA_SHORTEST,
    // Same as BIGNUM_DTOA_SHORTEST but for single-precision floats.
    BIGNUM_DTOA_SHORTEST_SINGLE,
    // Return 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.
    BIGNUM_DTOA_FIXED,
    // Return a fixed number of digits, no matter what the exponent is.
    BIGNUM_DTOA_PRECISION
  };
  
  // Converts the given double 'v' to ascii.
  // The result should be interpreted as buffer * 10^(point-length).
  // The buffer will be null-terminated.
  //
  // The input v must be > 0 and different from NaN, and Infinity.
  //
  // 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 number is round 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 gaps with '0's.
  //   Example: toFixed(0.001, 5) is allowed to return buffer="1", point=-2.
  //   Halfway cases are rounded up. The call toFixed(0.15, 2) thus returns
  //     buffer="2", point=0.
  //   Note: the length of the returned buffer has no meaning wrt the significance
  //   of its digits. That is, just because it contains '0's does not mean that
  //   any other digit would not satisfy the internal identity requirement.
  //  - 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 up.
  // 'BignumDtoa' expects the given buffer to be big enough to hold all digits
  // and a terminating null-character.
  void BignumDtoa(double v, BignumDtoaMode mode, int requested_digits,
                  Vector<char> buffer, int* length, int* point);
  
  }  // namespace double_conversion
  
  #endif  // DOUBLE_CONVERSION_BIGNUM_DTOA_H_
  