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 // Copyright 2010 the V8 project authors. All rights reserved.
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 // 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.
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 //       copyright notice, this list of conditions and the following
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 //       from this software without specific prior written permission.
 //
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 #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_

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