diff --git a/CMakeLists.txt b/CMakeLists.txt
index 02c34e3..bc4bdad 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,9 +6,11 @@
     double-conversion/cached-powers.h
     double-conversion/diy-fp.h
     double-conversion/double-conversion.h
+    double-conversion/double-to-string.h
     double-conversion/fast-dtoa.h
     double-conversion/fixed-dtoa.h
     double-conversion/ieee.h
+    double-conversion/string-to-double.h
     double-conversion/strtod.h
     double-conversion/utils.h)
 
@@ -17,9 +19,10 @@
             double-conversion/bignum-dtoa.cc
             double-conversion/cached-powers.cc
             double-conversion/diy-fp.cc
-            double-conversion/double-conversion.cc
+            double-conversion/double-to-string.cc
             double-conversion/fast-dtoa.cc
             double-conversion/fixed-dtoa.cc
+            double-conversion/string-to-double.cc
             double-conversion/strtod.cc
             ${headers})
 target_include_directories(
diff --git a/double-conversion/SConscript b/double-conversion/SConscript
index a117c32..f6d4da7 100644
--- a/double-conversion/SConscript
+++ b/double-conversion/SConscript
@@ -4,9 +4,10 @@
     'bignum-dtoa.cc',
     'cached-powers.cc',
     'diy-fp.cc',
-    'double-conversion.cc',
+    'double-to-string.cc',
     'fast-dtoa.cc',
     'fixed-dtoa.cc',
+    'string-to-double.cc',
     'strtod.cc'
   ]
 Return('double_conversion_sources')
diff --git a/double-conversion/double-conversion.h b/double-conversion/double-conversion.h
index ff19311..6e8884d 100644
--- a/double-conversion/double-conversion.h
+++ b/double-conversion/double-conversion.h
@@ -28,550 +28,7 @@
 #ifndef DOUBLE_CONVERSION_DOUBLE_CONVERSION_H_
 #define DOUBLE_CONVERSION_DOUBLE_CONVERSION_H_
 
-#include "utils.h"
-
-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.
-    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;
-
-  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.
-  static void DoubleToAscii(double v,
-                            DtoaMode mode,
-                            int requested_digits,
-                            char* buffer,
-                            int buffer_length,
-                            bool* sign,
-                            int* length,
-                            int* point);
-
- 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_;
-
-  DOUBLE_CONVERSION_DISALLOW_IMPLICIT_CONSTRUCTORS(DoubleToStringConverter);
-};
-
-
-class StringToDoubleConverter {
- public:
-  // Enumeration for allowing octals and ignoring junk when converting
-  // strings to numbers.
-  enum Flags {
-    NO_FLAGS = 0,
-    ALLOW_HEX = 1,
-    ALLOW_OCTALS = 2,
-    ALLOW_TRAILING_JUNK = 4,
-    ALLOW_LEADING_SPACES = 8,
-    ALLOW_TRAILING_SPACES = 16,
-    ALLOW_SPACES_AFTER_SIGN = 32,
-    ALLOW_CASE_INSENSITIVITY = 64,
-    ALLOW_CASE_INSENSIBILITY = 64,  // Deprecated
-    ALLOW_HEX_FLOATS = 128,
-  };
-
-  static const uc16 kNoSeparator = '\0';
-
-  // Flags should be a bit-or combination of the possible Flags-enum.
-  //  - NO_FLAGS: no special flags.
-  //  - ALLOW_HEX: recognizes the prefix "0x". Hex numbers may only be integers.
-  //      Ex: StringToDouble("0x1234") -> 4660.0
-  //          In StringToDouble("0x1234.56") the characters ".56" are trailing
-  //          junk. The result of the call is hence dependent on
-  //          the ALLOW_TRAILING_JUNK flag and/or the junk value.
-  //      With this flag "0x" is a junk-string. Even with ALLOW_TRAILING_JUNK,
-  //      the string will not be parsed as "0" followed by junk.
-  //
-  //  - ALLOW_OCTALS: recognizes the prefix "0" for octals:
-  //      If a sequence of octal digits starts with '0', then the number is
-  //      read as octal integer. Octal numbers may only be integers.
-  //      Ex: StringToDouble("01234") -> 668.0
-  //          StringToDouble("012349") -> 12349.0  // Not a sequence of octal
-  //                                               // digits.
-  //          In StringToDouble("01234.56") the characters ".56" are trailing
-  //          junk. The result of the call is hence dependent on
-  //          the ALLOW_TRAILING_JUNK flag and/or the junk value.
-  //          In StringToDouble("01234e56") the characters "e56" are trailing
-  //          junk, too.
-  //  - ALLOW_TRAILING_JUNK: ignore trailing characters that are not part of
-  //      a double literal.
-  //  - ALLOW_LEADING_SPACES: skip over leading whitespace, including spaces,
-  //                          new-lines, and tabs.
-  //  - ALLOW_TRAILING_SPACES: ignore trailing whitespace.
-  //  - ALLOW_SPACES_AFTER_SIGN: ignore whitespace after the sign.
-  //       Ex: StringToDouble("-   123.2") -> -123.2.
-  //           StringToDouble("+   123.2") -> 123.2
-  //  - ALLOW_CASE_INSENSITIVITY: ignore case of characters for special values:
-  //      infinity and nan.
-  //  - ALLOW_HEX_FLOATS: allows hexadecimal float literals.
-  //      This *must* start with "0x" and separate the exponent with "p".
-  //      Examples: 0x1.2p3 == 9.0
-  //                0x10.1p0 == 16.0625
-  //      ALLOW_HEX and ALLOW_HEX_FLOATS are indendent.
-  //
-  // empty_string_value is returned when an empty string is given as input.
-  // If ALLOW_LEADING_SPACES or ALLOW_TRAILING_SPACES are set, then a string
-  // containing only spaces is converted to the 'empty_string_value', too.
-  //
-  // junk_string_value is returned when
-  //  a) ALLOW_TRAILING_JUNK is not set, and a junk character (a character not
-  //     part of a double-literal) is found.
-  //  b) ALLOW_TRAILING_JUNK is set, but the string does not start with a
-  //     double literal.
-  //
-  // infinity_symbol and nan_symbol are strings that are used to detect
-  // inputs that represent infinity and NaN. They can be null, in which case
-  // they are ignored.
-  // The conversion routine first reads any possible signs. Then it compares the
-  // following character of the input-string with the first character of
-  // the infinity, and nan-symbol. If either matches, the function assumes, that
-  // a match has been found, and expects the following input characters to match
-  // the remaining characters of the special-value symbol.
-  // This means that the following restrictions apply to special-value symbols:
-  //  - they must not start with signs ('+', or '-'),
-  //  - they must not have the same first character.
-  //  - they must not start with digits.
-  //
-  // If the separator character is not kNoSeparator, then that specific
-  // character is ignored when in between two valid digits of the significant.
-  // It is not allowed to appear in the exponent.
-  // It is not allowed to lead or trail the number.
-  // It is not allowed to appear twice next to each other.
-  //
-  // Examples:
-  //  flags = ALLOW_HEX | ALLOW_TRAILING_JUNK,
-  //  empty_string_value = 0.0,
-  //  junk_string_value = NaN,
-  //  infinity_symbol = "infinity",
-  //  nan_symbol = "nan":
-  //    StringToDouble("0x1234") -> 4660.0.
-  //    StringToDouble("0x1234K") -> 4660.0.
-  //    StringToDouble("") -> 0.0  // empty_string_value.
-  //    StringToDouble(" ") -> NaN  // junk_string_value.
-  //    StringToDouble(" 1") -> NaN  // junk_string_value.
-  //    StringToDouble("0x") -> NaN  // junk_string_value.
-  //    StringToDouble("-123.45") -> -123.45.
-  //    StringToDouble("--123.45") -> NaN  // junk_string_value.
-  //    StringToDouble("123e45") -> 123e45.
-  //    StringToDouble("123E45") -> 123e45.
-  //    StringToDouble("123e+45") -> 123e45.
-  //    StringToDouble("123E-45") -> 123e-45.
-  //    StringToDouble("123e") -> 123.0  // trailing junk ignored.
-  //    StringToDouble("123e-") -> 123.0  // trailing junk ignored.
-  //    StringToDouble("+NaN") -> NaN  // NaN string literal.
-  //    StringToDouble("-infinity") -> -inf.  // infinity literal.
-  //    StringToDouble("Infinity") -> NaN  // junk_string_value.
-  //
-  //  flags = ALLOW_OCTAL | ALLOW_LEADING_SPACES,
-  //  empty_string_value = 0.0,
-  //  junk_string_value = NaN,
-  //  infinity_symbol = NULL,
-  //  nan_symbol = NULL:
-  //    StringToDouble("0x1234") -> NaN  // junk_string_value.
-  //    StringToDouble("01234") -> 668.0.
-  //    StringToDouble("") -> 0.0  // empty_string_value.
-  //    StringToDouble(" ") -> 0.0  // empty_string_value.
-  //    StringToDouble(" 1") -> 1.0
-  //    StringToDouble("0x") -> NaN  // junk_string_value.
-  //    StringToDouble("0123e45") -> NaN  // junk_string_value.
-  //    StringToDouble("01239E45") -> 1239e45.
-  //    StringToDouble("-infinity") -> NaN  // junk_string_value.
-  //    StringToDouble("NaN") -> NaN  // junk_string_value.
-  //
-  //  flags = NO_FLAGS,
-  //  separator = ' ':
-  //    StringToDouble("1 2 3 4") -> 1234.0
-  //    StringToDouble("1  2") -> NaN // junk_string_value
-  //    StringToDouble("1 000 000.0") -> 1000000.0
-  //    StringToDouble("1.000 000") -> 1.0
-  //    StringToDouble("1.0e1 000") -> NaN // junk_string_value
-  StringToDoubleConverter(int flags,
-                          double empty_string_value,
-                          double junk_string_value,
-                          const char* infinity_symbol,
-                          const char* nan_symbol,
-                          uc16 separator = kNoSeparator)
-      : flags_(flags),
-        empty_string_value_(empty_string_value),
-        junk_string_value_(junk_string_value),
-        infinity_symbol_(infinity_symbol),
-        nan_symbol_(nan_symbol),
-        separator_(separator) {
-  }
-
-  // Performs the conversion.
-  // The output parameter 'processed_characters_count' is set to the number
-  // of characters that have been processed to read the number.
-  // Spaces than are processed with ALLOW_{LEADING|TRAILING}_SPACES are included
-  // in the 'processed_characters_count'. Trailing junk is never included.
-  double StringToDouble(const char* buffer,
-                        int length,
-                        int* processed_characters_count) const;
-
-  // Same as StringToDouble above but for 16 bit characters.
-  double StringToDouble(const uc16* buffer,
-                        int length,
-                        int* processed_characters_count) const;
-
-  // Same as StringToDouble but reads a float.
-  // Note that this is not equivalent to static_cast<float>(StringToDouble(...))
-  // due to potential double-rounding.
-  float StringToFloat(const char* buffer,
-                      int length,
-                      int* processed_characters_count) const;
-
-  // Same as StringToFloat above but for 16 bit characters.
-  float StringToFloat(const uc16* buffer,
-                      int length,
-                      int* processed_characters_count) const;
-
- private:
-  const int flags_;
-  const double empty_string_value_;
-  const double junk_string_value_;
-  const char* const infinity_symbol_;
-  const char* const nan_symbol_;
-  const uc16 separator_;
-
-  template <class Iterator>
-  double StringToIeee(Iterator start_pointer,
-                      int length,
-                      bool read_as_double,
-                      int* processed_characters_count) const;
-
-  DOUBLE_CONVERSION_DISALLOW_IMPLICIT_CONSTRUCTORS(StringToDoubleConverter);
-};
-
-}  // namespace double_conversion
+#include "string-to-double.h"
+#include "double-to-string.h"
 
 #endif  // DOUBLE_CONVERSION_DOUBLE_CONVERSION_H_
diff --git a/double-conversion/double-to-string.cc b/double-conversion/double-to-string.cc
new file mode 100644
index 0000000..13c7110
--- /dev/null
+++ b/double-conversion/double-to-string.cc
@@ -0,0 +1,422 @@
+// 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.
+
+#include <algorithm>
+#include <climits>
+#include <cmath>
+
+#include "double-to-string.h"
+
+#include "bignum-dtoa.h"
+#include "fast-dtoa.h"
+#include "fixed-dtoa.h"
+#include "ieee.h"
+#include "utils.h"
+
+namespace double_conversion {
+
+const DoubleToStringConverter& DoubleToStringConverter::EcmaScriptConverter() {
+  int flags = UNIQUE_ZERO | EMIT_POSITIVE_EXPONENT_SIGN;
+  static DoubleToStringConverter converter(flags,
+                                           "Infinity",
+                                           "NaN",
+                                           'e',
+                                           -6, 21,
+                                           6, 0);
+  return converter;
+}
+
+
+bool DoubleToStringConverter::HandleSpecialValues(
+    double value,
+    StringBuilder* result_builder) const {
+  Double double_inspect(value);
+  if (double_inspect.IsInfinite()) {
+    if (infinity_symbol_ == NULL) return false;
+    if (value < 0) {
+      result_builder->AddCharacter('-');
+    }
+    result_builder->AddString(infinity_symbol_);
+    return true;
+  }
+  if (double_inspect.IsNan()) {
+    if (nan_symbol_ == NULL) return false;
+    result_builder->AddString(nan_symbol_);
+    return true;
+  }
+  return false;
+}
+
+
+void DoubleToStringConverter::CreateExponentialRepresentation(
+    const char* decimal_digits,
+    int length,
+    int exponent,
+    StringBuilder* result_builder) const {
+  DOUBLE_CONVERSION_ASSERT(length != 0);
+  result_builder->AddCharacter(decimal_digits[0]);
+  if (length != 1) {
+    result_builder->AddCharacter('.');
+    result_builder->AddSubstring(&decimal_digits[1], length-1);
+  }
+  result_builder->AddCharacter(exponent_character_);
+  if (exponent < 0) {
+    result_builder->AddCharacter('-');
+    exponent = -exponent;
+  } else {
+    if ((flags_ & EMIT_POSITIVE_EXPONENT_SIGN) != 0) {
+      result_builder->AddCharacter('+');
+    }
+  }
+  if (exponent == 0) {
+    result_builder->AddCharacter('0');
+    return;
+  }
+  DOUBLE_CONVERSION_ASSERT(exponent < 1e4);
+  const int kMaxExponentLength = 5;
+  char buffer[kMaxExponentLength + 1];
+  buffer[kMaxExponentLength] = '\0';
+  int first_char_pos = kMaxExponentLength;
+  while (exponent > 0) {
+    buffer[--first_char_pos] = '0' + (exponent % 10);
+    exponent /= 10;
+  }
+  result_builder->AddSubstring(&buffer[first_char_pos],
+                               kMaxExponentLength - first_char_pos);
+}
+
+
+void DoubleToStringConverter::CreateDecimalRepresentation(
+    const char* decimal_digits,
+    int length,
+    int decimal_point,
+    int digits_after_point,
+    StringBuilder* result_builder) const {
+  // Create a representation that is padded with zeros if needed.
+  if (decimal_point <= 0) {
+      // "0.00000decimal_rep" or "0.000decimal_rep00".
+    result_builder->AddCharacter('0');
+    if (digits_after_point > 0) {
+      result_builder->AddCharacter('.');
+      result_builder->AddPadding('0', -decimal_point);
+      DOUBLE_CONVERSION_ASSERT(length <= digits_after_point - (-decimal_point));
+      result_builder->AddSubstring(decimal_digits, length);
+      int remaining_digits = digits_after_point - (-decimal_point) - length;
+      result_builder->AddPadding('0', remaining_digits);
+    }
+  } else if (decimal_point >= length) {
+    // "decimal_rep0000.00000" or "decimal_rep.0000".
+    result_builder->AddSubstring(decimal_digits, length);
+    result_builder->AddPadding('0', decimal_point - length);
+    if (digits_after_point > 0) {
+      result_builder->AddCharacter('.');
+      result_builder->AddPadding('0', digits_after_point);
+    }
+  } else {
+    // "decima.l_rep000".
+    DOUBLE_CONVERSION_ASSERT(digits_after_point > 0);
+    result_builder->AddSubstring(decimal_digits, decimal_point);
+    result_builder->AddCharacter('.');
+    DOUBLE_CONVERSION_ASSERT(length - decimal_point <= digits_after_point);
+    result_builder->AddSubstring(&decimal_digits[decimal_point],
+                                 length - decimal_point);
+    int remaining_digits = digits_after_point - (length - decimal_point);
+    result_builder->AddPadding('0', remaining_digits);
+  }
+  if (digits_after_point == 0) {
+    if ((flags_ & EMIT_TRAILING_DECIMAL_POINT) != 0) {
+      result_builder->AddCharacter('.');
+    }
+    if ((flags_ & EMIT_TRAILING_ZERO_AFTER_POINT) != 0) {
+      result_builder->AddCharacter('0');
+    }
+  }
+}
+
+
+bool DoubleToStringConverter::ToShortestIeeeNumber(
+    double value,
+    StringBuilder* result_builder,
+    DoubleToStringConverter::DtoaMode mode) const {
+  DOUBLE_CONVERSION_ASSERT(mode == SHORTEST || mode == SHORTEST_SINGLE);
+  if (Double(value).IsSpecial()) {
+    return HandleSpecialValues(value, result_builder);
+  }
+
+  int decimal_point;
+  bool sign;
+  const int kDecimalRepCapacity = kBase10MaximalLength + 1;
+  char decimal_rep[kDecimalRepCapacity];
+  int decimal_rep_length;
+
+  DoubleToAscii(value, mode, 0, decimal_rep, kDecimalRepCapacity,
+                &sign, &decimal_rep_length, &decimal_point);
+
+  bool unique_zero = (flags_ & UNIQUE_ZERO) != 0;
+  if (sign && (value != 0.0 || !unique_zero)) {
+    result_builder->AddCharacter('-');
+  }
+
+  int exponent = decimal_point - 1;
+  if ((decimal_in_shortest_low_ <= exponent) &&
+      (exponent < decimal_in_shortest_high_)) {
+    CreateDecimalRepresentation(decimal_rep, decimal_rep_length,
+                                decimal_point,
+                                (std::max)(0, decimal_rep_length - decimal_point),
+                                result_builder);
+  } else {
+    CreateExponentialRepresentation(decimal_rep, decimal_rep_length, exponent,
+                                    result_builder);
+  }
+  return true;
+}
+
+
+bool DoubleToStringConverter::ToFixed(double value,
+                                      int requested_digits,
+                                      StringBuilder* result_builder) const {
+  DOUBLE_CONVERSION_ASSERT(kMaxFixedDigitsBeforePoint == 60);
+  const double kFirstNonFixed = 1e60;
+
+  if (Double(value).IsSpecial()) {
+    return HandleSpecialValues(value, result_builder);
+  }
+
+  if (requested_digits > kMaxFixedDigitsAfterPoint) return false;
+  if (value >= kFirstNonFixed || value <= -kFirstNonFixed) return false;
+
+  // Find a sufficiently precise decimal representation of n.
+  int decimal_point;
+  bool sign;
+  // Add space for the '\0' byte.
+  const int kDecimalRepCapacity =
+      kMaxFixedDigitsBeforePoint + kMaxFixedDigitsAfterPoint + 1;
+  char decimal_rep[kDecimalRepCapacity];
+  int decimal_rep_length;
+  DoubleToAscii(value, FIXED, requested_digits,
+                decimal_rep, kDecimalRepCapacity,
+                &sign, &decimal_rep_length, &decimal_point);
+
+  bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
+  if (sign && (value != 0.0 || !unique_zero)) {
+    result_builder->AddCharacter('-');
+  }
+
+  CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
+                              requested_digits, result_builder);
+  return true;
+}
+
+
+bool DoubleToStringConverter::ToExponential(
+    double value,
+    int requested_digits,
+    StringBuilder* result_builder) const {
+  if (Double(value).IsSpecial()) {
+    return HandleSpecialValues(value, result_builder);
+  }
+
+  if (requested_digits < -1) return false;
+  if (requested_digits > kMaxExponentialDigits) return false;
+
+  int decimal_point;
+  bool sign;
+  // Add space for digit before the decimal point and the '\0' character.
+  const int kDecimalRepCapacity = kMaxExponentialDigits + 2;
+  DOUBLE_CONVERSION_ASSERT(kDecimalRepCapacity > kBase10MaximalLength);
+  char decimal_rep[kDecimalRepCapacity];
+#ifndef NDEBUG
+  // Problem: there is an assert in StringBuilder::AddSubstring() that
+  // will pass this buffer to strlen(), and this buffer is not generally
+  // null-terminated.
+  memset(decimal_rep, 0, sizeof(decimal_rep));
+#endif
+  int decimal_rep_length;
+
+  if (requested_digits == -1) {
+    DoubleToAscii(value, SHORTEST, 0,
+                  decimal_rep, kDecimalRepCapacity,
+                  &sign, &decimal_rep_length, &decimal_point);
+  } else {
+    DoubleToAscii(value, PRECISION, requested_digits + 1,
+                  decimal_rep, kDecimalRepCapacity,
+                  &sign, &decimal_rep_length, &decimal_point);
+    DOUBLE_CONVERSION_ASSERT(decimal_rep_length <= requested_digits + 1);
+
+    for (int i = decimal_rep_length; i < requested_digits + 1; ++i) {
+      decimal_rep[i] = '0';
+    }
+    decimal_rep_length = requested_digits + 1;
+  }
+
+  bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
+  if (sign && (value != 0.0 || !unique_zero)) {
+    result_builder->AddCharacter('-');
+  }
+
+  int exponent = decimal_point - 1;
+  CreateExponentialRepresentation(decimal_rep,
+                                  decimal_rep_length,
+                                  exponent,
+                                  result_builder);
+  return true;
+}
+
+
+bool DoubleToStringConverter::ToPrecision(double value,
+                                          int precision,
+                                          StringBuilder* result_builder) const {
+  if (Double(value).IsSpecial()) {
+    return HandleSpecialValues(value, result_builder);
+  }
+
+  if (precision < kMinPrecisionDigits || precision > kMaxPrecisionDigits) {
+    return false;
+  }
+
+  // Find a sufficiently precise decimal representation of n.
+  int decimal_point;
+  bool sign;
+  // Add one for the terminating null character.
+  const int kDecimalRepCapacity = kMaxPrecisionDigits + 1;
+  char decimal_rep[kDecimalRepCapacity];
+  int decimal_rep_length;
+
+  DoubleToAscii(value, PRECISION, precision,
+                decimal_rep, kDecimalRepCapacity,
+                &sign, &decimal_rep_length, &decimal_point);
+  DOUBLE_CONVERSION_ASSERT(decimal_rep_length <= precision);
+
+  bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
+  if (sign && (value != 0.0 || !unique_zero)) {
+    result_builder->AddCharacter('-');
+  }
+
+  // The exponent if we print the number as x.xxeyyy. That is with the
+  // decimal point after the first digit.
+  int exponent = decimal_point - 1;
+
+  int extra_zero = ((flags_ & EMIT_TRAILING_ZERO_AFTER_POINT) != 0) ? 1 : 0;
+  if ((-decimal_point + 1 > max_leading_padding_zeroes_in_precision_mode_) ||
+      (decimal_point - precision + extra_zero >
+       max_trailing_padding_zeroes_in_precision_mode_)) {
+    // Fill buffer to contain 'precision' digits.
+    // Usually the buffer is already at the correct length, but 'DoubleToAscii'
+    // is allowed to return less characters.
+    for (int i = decimal_rep_length; i < precision; ++i) {
+      decimal_rep[i] = '0';
+    }
+
+    CreateExponentialRepresentation(decimal_rep,
+                                    precision,
+                                    exponent,
+                                    result_builder);
+  } else {
+    CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
+                                (std::max)(0, precision - decimal_point),
+                                result_builder);
+  }
+  return true;
+}
+
+
+static BignumDtoaMode DtoaToBignumDtoaMode(
+    DoubleToStringConverter::DtoaMode dtoa_mode) {
+  switch (dtoa_mode) {
+    case DoubleToStringConverter::SHORTEST:  return BIGNUM_DTOA_SHORTEST;
+    case DoubleToStringConverter::SHORTEST_SINGLE:
+        return BIGNUM_DTOA_SHORTEST_SINGLE;
+    case DoubleToStringConverter::FIXED:     return BIGNUM_DTOA_FIXED;
+    case DoubleToStringConverter::PRECISION: return BIGNUM_DTOA_PRECISION;
+    default:
+      DOUBLE_CONVERSION_UNREACHABLE();
+  }
+}
+
+
+void DoubleToStringConverter::DoubleToAscii(double v,
+                                            DtoaMode mode,
+                                            int requested_digits,
+                                            char* buffer,
+                                            int buffer_length,
+                                            bool* sign,
+                                            int* length,
+                                            int* point) {
+  Vector<char> vector(buffer, buffer_length);
+  DOUBLE_CONVERSION_ASSERT(!Double(v).IsSpecial());
+  DOUBLE_CONVERSION_ASSERT(mode == SHORTEST || mode == SHORTEST_SINGLE || requested_digits >= 0);
+
+  if (Double(v).Sign() < 0) {
+    *sign = true;
+    v = -v;
+  } else {
+    *sign = false;
+  }
+
+  if (mode == PRECISION && requested_digits == 0) {
+    vector[0] = '\0';
+    *length = 0;
+    return;
+  }
+
+  if (v == 0) {
+    vector[0] = '0';
+    vector[1] = '\0';
+    *length = 1;
+    *point = 1;
+    return;
+  }
+
+  bool fast_worked;
+  switch (mode) {
+    case SHORTEST:
+      fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST, 0, vector, length, point);
+      break;
+    case SHORTEST_SINGLE:
+      fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST_SINGLE, 0,
+                             vector, length, point);
+      break;
+    case FIXED:
+      fast_worked = FastFixedDtoa(v, requested_digits, vector, length, point);
+      break;
+    case PRECISION:
+      fast_worked = FastDtoa(v, FAST_DTOA_PRECISION, requested_digits,
+                             vector, length, point);
+      break;
+    default:
+      fast_worked = false;
+      DOUBLE_CONVERSION_UNREACHABLE();
+  }
+  if (fast_worked) return;
+
+  // If the fast dtoa didn't succeed use the slower bignum version.
+  BignumDtoaMode bignum_mode = DtoaToBignumDtoaMode(mode);
+  BignumDtoa(v, bignum_mode, requested_digits, vector, length, point);
+  vector[*length] = '\0';
+}
+
+}  // namespace double_conversion
diff --git a/double-conversion/double-to-string.h b/double-conversion/double-to-string.h
new file mode 100644
index 0000000..c1be34d
--- /dev/null
+++ b/double-conversion/double-to-string.h
@@ -0,0 +1,387 @@
+// 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.
+
+#ifndef DOUBLE_CONVERSION_DOUBLE_TO_STRING_H_
+#define DOUBLE_CONVERSION_DOUBLE_TO_STRING_H_
+
+#include "utils.h"
+
+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.
+    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;
+
+  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.
+  static void DoubleToAscii(double v,
+                            DtoaMode mode,
+                            int requested_digits,
+                            char* buffer,
+                            int buffer_length,
+                            bool* sign,
+                            int* length,
+                            int* point);
+
+ 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_;
+
+  DOUBLE_CONVERSION_DISALLOW_IMPLICIT_CONSTRUCTORS(DoubleToStringConverter);
+};
+
+}  // namespace double_conversion
+
+#endif  // DOUBLE_CONVERSION_DOUBLE_TO_STRING_H_
diff --git a/double-conversion/double-conversion.cc b/double-conversion/string-to-double.cc
similarity index 66%
rename from double-conversion/double-conversion.cc
rename to double-conversion/string-to-double.cc
index e047a28..d7f7a4a 100644
--- a/double-conversion/double-conversion.cc
+++ b/double-conversion/string-to-double.cc
@@ -25,403 +25,18 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include <algorithm>
 #include <climits>
 #include <locale>
 #include <cmath>
 
-#include "double-conversion.h"
+#include "string-to-double.h"
 
-#include "bignum-dtoa.h"
-#include "fast-dtoa.h"
-#include "fixed-dtoa.h"
 #include "ieee.h"
 #include "strtod.h"
 #include "utils.h"
 
 namespace double_conversion {
 
-const DoubleToStringConverter& DoubleToStringConverter::EcmaScriptConverter() {
-  int flags = UNIQUE_ZERO | EMIT_POSITIVE_EXPONENT_SIGN;
-  static DoubleToStringConverter converter(flags,
-                                           "Infinity",
-                                           "NaN",
-                                           'e',
-                                           -6, 21,
-                                           6, 0);
-  return converter;
-}
-
-
-bool DoubleToStringConverter::HandleSpecialValues(
-    double value,
-    StringBuilder* result_builder) const {
-  Double double_inspect(value);
-  if (double_inspect.IsInfinite()) {
-    if (infinity_symbol_ == NULL) return false;
-    if (value < 0) {
-      result_builder->AddCharacter('-');
-    }
-    result_builder->AddString(infinity_symbol_);
-    return true;
-  }
-  if (double_inspect.IsNan()) {
-    if (nan_symbol_ == NULL) return false;
-    result_builder->AddString(nan_symbol_);
-    return true;
-  }
-  return false;
-}
-
-
-void DoubleToStringConverter::CreateExponentialRepresentation(
-    const char* decimal_digits,
-    int length,
-    int exponent,
-    StringBuilder* result_builder) const {
-  DOUBLE_CONVERSION_ASSERT(length != 0);
-  result_builder->AddCharacter(decimal_digits[0]);
-  if (length != 1) {
-    result_builder->AddCharacter('.');
-    result_builder->AddSubstring(&decimal_digits[1], length-1);
-  }
-  result_builder->AddCharacter(exponent_character_);
-  if (exponent < 0) {
-    result_builder->AddCharacter('-');
-    exponent = -exponent;
-  } else {
-    if ((flags_ & EMIT_POSITIVE_EXPONENT_SIGN) != 0) {
-      result_builder->AddCharacter('+');
-    }
-  }
-  if (exponent == 0) {
-    result_builder->AddCharacter('0');
-    return;
-  }
-  DOUBLE_CONVERSION_ASSERT(exponent < 1e4);
-  const int kMaxExponentLength = 5;
-  char buffer[kMaxExponentLength + 1];
-  buffer[kMaxExponentLength] = '\0';
-  int first_char_pos = kMaxExponentLength;
-  while (exponent > 0) {
-    buffer[--first_char_pos] = '0' + (exponent % 10);
-    exponent /= 10;
-  }
-  result_builder->AddSubstring(&buffer[first_char_pos],
-                               kMaxExponentLength - first_char_pos);
-}
-
-
-void DoubleToStringConverter::CreateDecimalRepresentation(
-    const char* decimal_digits,
-    int length,
-    int decimal_point,
-    int digits_after_point,
-    StringBuilder* result_builder) const {
-  // Create a representation that is padded with zeros if needed.
-  if (decimal_point <= 0) {
-      // "0.00000decimal_rep" or "0.000decimal_rep00".
-    result_builder->AddCharacter('0');
-    if (digits_after_point > 0) {
-      result_builder->AddCharacter('.');
-      result_builder->AddPadding('0', -decimal_point);
-      DOUBLE_CONVERSION_ASSERT(length <= digits_after_point - (-decimal_point));
-      result_builder->AddSubstring(decimal_digits, length);
-      int remaining_digits = digits_after_point - (-decimal_point) - length;
-      result_builder->AddPadding('0', remaining_digits);
-    }
-  } else if (decimal_point >= length) {
-    // "decimal_rep0000.00000" or "decimal_rep.0000".
-    result_builder->AddSubstring(decimal_digits, length);
-    result_builder->AddPadding('0', decimal_point - length);
-    if (digits_after_point > 0) {
-      result_builder->AddCharacter('.');
-      result_builder->AddPadding('0', digits_after_point);
-    }
-  } else {
-    // "decima.l_rep000".
-    DOUBLE_CONVERSION_ASSERT(digits_after_point > 0);
-    result_builder->AddSubstring(decimal_digits, decimal_point);
-    result_builder->AddCharacter('.');
-    DOUBLE_CONVERSION_ASSERT(length - decimal_point <= digits_after_point);
-    result_builder->AddSubstring(&decimal_digits[decimal_point],
-                                 length - decimal_point);
-    int remaining_digits = digits_after_point - (length - decimal_point);
-    result_builder->AddPadding('0', remaining_digits);
-  }
-  if (digits_after_point == 0) {
-    if ((flags_ & EMIT_TRAILING_DECIMAL_POINT) != 0) {
-      result_builder->AddCharacter('.');
-    }
-    if ((flags_ & EMIT_TRAILING_ZERO_AFTER_POINT) != 0) {
-      result_builder->AddCharacter('0');
-    }
-  }
-}
-
-
-bool DoubleToStringConverter::ToShortestIeeeNumber(
-    double value,
-    StringBuilder* result_builder,
-    DoubleToStringConverter::DtoaMode mode) const {
-  DOUBLE_CONVERSION_ASSERT(mode == SHORTEST || mode == SHORTEST_SINGLE);
-  if (Double(value).IsSpecial()) {
-    return HandleSpecialValues(value, result_builder);
-  }
-
-  int decimal_point;
-  bool sign;
-  const int kDecimalRepCapacity = kBase10MaximalLength + 1;
-  char decimal_rep[kDecimalRepCapacity];
-  int decimal_rep_length;
-
-  DoubleToAscii(value, mode, 0, decimal_rep, kDecimalRepCapacity,
-                &sign, &decimal_rep_length, &decimal_point);
-
-  bool unique_zero = (flags_ & UNIQUE_ZERO) != 0;
-  if (sign && (value != 0.0 || !unique_zero)) {
-    result_builder->AddCharacter('-');
-  }
-
-  int exponent = decimal_point - 1;
-  if ((decimal_in_shortest_low_ <= exponent) &&
-      (exponent < decimal_in_shortest_high_)) {
-    CreateDecimalRepresentation(decimal_rep, decimal_rep_length,
-                                decimal_point,
-                                (std::max)(0, decimal_rep_length - decimal_point),
-                                result_builder);
-  } else {
-    CreateExponentialRepresentation(decimal_rep, decimal_rep_length, exponent,
-                                    result_builder);
-  }
-  return true;
-}
-
-
-bool DoubleToStringConverter::ToFixed(double value,
-                                      int requested_digits,
-                                      StringBuilder* result_builder) const {
-  DOUBLE_CONVERSION_ASSERT(kMaxFixedDigitsBeforePoint == 60);
-  const double kFirstNonFixed = 1e60;
-
-  if (Double(value).IsSpecial()) {
-    return HandleSpecialValues(value, result_builder);
-  }
-
-  if (requested_digits > kMaxFixedDigitsAfterPoint) return false;
-  if (value >= kFirstNonFixed || value <= -kFirstNonFixed) return false;
-
-  // Find a sufficiently precise decimal representation of n.
-  int decimal_point;
-  bool sign;
-  // Add space for the '\0' byte.
-  const int kDecimalRepCapacity =
-      kMaxFixedDigitsBeforePoint + kMaxFixedDigitsAfterPoint + 1;
-  char decimal_rep[kDecimalRepCapacity];
-  int decimal_rep_length;
-  DoubleToAscii(value, FIXED, requested_digits,
-                decimal_rep, kDecimalRepCapacity,
-                &sign, &decimal_rep_length, &decimal_point);
-
-  bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
-  if (sign && (value != 0.0 || !unique_zero)) {
-    result_builder->AddCharacter('-');
-  }
-
-  CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
-                              requested_digits, result_builder);
-  return true;
-}
-
-
-bool DoubleToStringConverter::ToExponential(
-    double value,
-    int requested_digits,
-    StringBuilder* result_builder) const {
-  if (Double(value).IsSpecial()) {
-    return HandleSpecialValues(value, result_builder);
-  }
-
-  if (requested_digits < -1) return false;
-  if (requested_digits > kMaxExponentialDigits) return false;
-
-  int decimal_point;
-  bool sign;
-  // Add space for digit before the decimal point and the '\0' character.
-  const int kDecimalRepCapacity = kMaxExponentialDigits + 2;
-  DOUBLE_CONVERSION_ASSERT(kDecimalRepCapacity > kBase10MaximalLength);
-  char decimal_rep[kDecimalRepCapacity];
-#ifndef NDEBUG
-  // Problem: there is an assert in StringBuilder::AddSubstring() that
-  // will pass this buffer to strlen(), and this buffer is not generally
-  // null-terminated.
-  memset(decimal_rep, 0, sizeof(decimal_rep));
-#endif
-  int decimal_rep_length;
-
-  if (requested_digits == -1) {
-    DoubleToAscii(value, SHORTEST, 0,
-                  decimal_rep, kDecimalRepCapacity,
-                  &sign, &decimal_rep_length, &decimal_point);
-  } else {
-    DoubleToAscii(value, PRECISION, requested_digits + 1,
-                  decimal_rep, kDecimalRepCapacity,
-                  &sign, &decimal_rep_length, &decimal_point);
-    DOUBLE_CONVERSION_ASSERT(decimal_rep_length <= requested_digits + 1);
-
-    for (int i = decimal_rep_length; i < requested_digits + 1; ++i) {
-      decimal_rep[i] = '0';
-    }
-    decimal_rep_length = requested_digits + 1;
-  }
-
-  bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
-  if (sign && (value != 0.0 || !unique_zero)) {
-    result_builder->AddCharacter('-');
-  }
-
-  int exponent = decimal_point - 1;
-  CreateExponentialRepresentation(decimal_rep,
-                                  decimal_rep_length,
-                                  exponent,
-                                  result_builder);
-  return true;
-}
-
-
-bool DoubleToStringConverter::ToPrecision(double value,
-                                          int precision,
-                                          StringBuilder* result_builder) const {
-  if (Double(value).IsSpecial()) {
-    return HandleSpecialValues(value, result_builder);
-  }
-
-  if (precision < kMinPrecisionDigits || precision > kMaxPrecisionDigits) {
-    return false;
-  }
-
-  // Find a sufficiently precise decimal representation of n.
-  int decimal_point;
-  bool sign;
-  // Add one for the terminating null character.
-  const int kDecimalRepCapacity = kMaxPrecisionDigits + 1;
-  char decimal_rep[kDecimalRepCapacity];
-  int decimal_rep_length;
-
-  DoubleToAscii(value, PRECISION, precision,
-                decimal_rep, kDecimalRepCapacity,
-                &sign, &decimal_rep_length, &decimal_point);
-  DOUBLE_CONVERSION_ASSERT(decimal_rep_length <= precision);
-
-  bool unique_zero = ((flags_ & UNIQUE_ZERO) != 0);
-  if (sign && (value != 0.0 || !unique_zero)) {
-    result_builder->AddCharacter('-');
-  }
-
-  // The exponent if we print the number as x.xxeyyy. That is with the
-  // decimal point after the first digit.
-  int exponent = decimal_point - 1;
-
-  int extra_zero = ((flags_ & EMIT_TRAILING_ZERO_AFTER_POINT) != 0) ? 1 : 0;
-  if ((-decimal_point + 1 > max_leading_padding_zeroes_in_precision_mode_) ||
-      (decimal_point - precision + extra_zero >
-       max_trailing_padding_zeroes_in_precision_mode_)) {
-    // Fill buffer to contain 'precision' digits.
-    // Usually the buffer is already at the correct length, but 'DoubleToAscii'
-    // is allowed to return less characters.
-    for (int i = decimal_rep_length; i < precision; ++i) {
-      decimal_rep[i] = '0';
-    }
-
-    CreateExponentialRepresentation(decimal_rep,
-                                    precision,
-                                    exponent,
-                                    result_builder);
-  } else {
-    CreateDecimalRepresentation(decimal_rep, decimal_rep_length, decimal_point,
-                                (std::max)(0, precision - decimal_point),
-                                result_builder);
-  }
-  return true;
-}
-
-
-static BignumDtoaMode DtoaToBignumDtoaMode(
-    DoubleToStringConverter::DtoaMode dtoa_mode) {
-  switch (dtoa_mode) {
-    case DoubleToStringConverter::SHORTEST:  return BIGNUM_DTOA_SHORTEST;
-    case DoubleToStringConverter::SHORTEST_SINGLE:
-        return BIGNUM_DTOA_SHORTEST_SINGLE;
-    case DoubleToStringConverter::FIXED:     return BIGNUM_DTOA_FIXED;
-    case DoubleToStringConverter::PRECISION: return BIGNUM_DTOA_PRECISION;
-    default:
-      DOUBLE_CONVERSION_UNREACHABLE();
-  }
-}
-
-
-void DoubleToStringConverter::DoubleToAscii(double v,
-                                            DtoaMode mode,
-                                            int requested_digits,
-                                            char* buffer,
-                                            int buffer_length,
-                                            bool* sign,
-                                            int* length,
-                                            int* point) {
-  Vector<char> vector(buffer, buffer_length);
-  DOUBLE_CONVERSION_ASSERT(!Double(v).IsSpecial());
-  DOUBLE_CONVERSION_ASSERT(mode == SHORTEST || mode == SHORTEST_SINGLE || requested_digits >= 0);
-
-  if (Double(v).Sign() < 0) {
-    *sign = true;
-    v = -v;
-  } else {
-    *sign = false;
-  }
-
-  if (mode == PRECISION && requested_digits == 0) {
-    vector[0] = '\0';
-    *length = 0;
-    return;
-  }
-
-  if (v == 0) {
-    vector[0] = '0';
-    vector[1] = '\0';
-    *length = 1;
-    *point = 1;
-    return;
-  }
-
-  bool fast_worked;
-  switch (mode) {
-    case SHORTEST:
-      fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST, 0, vector, length, point);
-      break;
-    case SHORTEST_SINGLE:
-      fast_worked = FastDtoa(v, FAST_DTOA_SHORTEST_SINGLE, 0,
-                             vector, length, point);
-      break;
-    case FIXED:
-      fast_worked = FastFixedDtoa(v, requested_digits, vector, length, point);
-      break;
-    case PRECISION:
-      fast_worked = FastDtoa(v, FAST_DTOA_PRECISION, requested_digits,
-                             vector, length, point);
-      break;
-    default:
-      fast_worked = false;
-      DOUBLE_CONVERSION_UNREACHABLE();
-  }
-  if (fast_worked) return;
-
-  // If the fast dtoa didn't succeed use the slower bignum version.
-  BignumDtoaMode bignum_mode = DtoaToBignumDtoaMode(mode);
-  BignumDtoa(v, bignum_mode, requested_digits, vector, length, point);
-  vector[*length] = '\0';
-}
-
-
 namespace {
 
 inline char ToLower(char ch) {
diff --git a/double-conversion/string-to-double.h b/double-conversion/string-to-double.h
new file mode 100644
index 0000000..ecd6c76
--- /dev/null
+++ b/double-conversion/string-to-double.h
@@ -0,0 +1,226 @@
+// 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.
+
+#ifndef DOUBLE_CONVERSION_STRING_TO_DOUBLE_H_
+#define DOUBLE_CONVERSION_STRING_TO_DOUBLE_H_
+
+#include "utils.h"
+
+namespace double_conversion {
+
+class StringToDoubleConverter {
+ public:
+  // Enumeration for allowing octals and ignoring junk when converting
+  // strings to numbers.
+  enum Flags {
+    NO_FLAGS = 0,
+    ALLOW_HEX = 1,
+    ALLOW_OCTALS = 2,
+    ALLOW_TRAILING_JUNK = 4,
+    ALLOW_LEADING_SPACES = 8,
+    ALLOW_TRAILING_SPACES = 16,
+    ALLOW_SPACES_AFTER_SIGN = 32,
+    ALLOW_CASE_INSENSITIVITY = 64,
+    ALLOW_CASE_INSENSIBILITY = 64,  // Deprecated
+    ALLOW_HEX_FLOATS = 128,
+  };
+
+  static const uc16 kNoSeparator = '\0';
+
+  // Flags should be a bit-or combination of the possible Flags-enum.
+  //  - NO_FLAGS: no special flags.
+  //  - ALLOW_HEX: recognizes the prefix "0x". Hex numbers may only be integers.
+  //      Ex: StringToDouble("0x1234") -> 4660.0
+  //          In StringToDouble("0x1234.56") the characters ".56" are trailing
+  //          junk. The result of the call is hence dependent on
+  //          the ALLOW_TRAILING_JUNK flag and/or the junk value.
+  //      With this flag "0x" is a junk-string. Even with ALLOW_TRAILING_JUNK,
+  //      the string will not be parsed as "0" followed by junk.
+  //
+  //  - ALLOW_OCTALS: recognizes the prefix "0" for octals:
+  //      If a sequence of octal digits starts with '0', then the number is
+  //      read as octal integer. Octal numbers may only be integers.
+  //      Ex: StringToDouble("01234") -> 668.0
+  //          StringToDouble("012349") -> 12349.0  // Not a sequence of octal
+  //                                               // digits.
+  //          In StringToDouble("01234.56") the characters ".56" are trailing
+  //          junk. The result of the call is hence dependent on
+  //          the ALLOW_TRAILING_JUNK flag and/or the junk value.
+  //          In StringToDouble("01234e56") the characters "e56" are trailing
+  //          junk, too.
+  //  - ALLOW_TRAILING_JUNK: ignore trailing characters that are not part of
+  //      a double literal.
+  //  - ALLOW_LEADING_SPACES: skip over leading whitespace, including spaces,
+  //                          new-lines, and tabs.
+  //  - ALLOW_TRAILING_SPACES: ignore trailing whitespace.
+  //  - ALLOW_SPACES_AFTER_SIGN: ignore whitespace after the sign.
+  //       Ex: StringToDouble("-   123.2") -> -123.2.
+  //           StringToDouble("+   123.2") -> 123.2
+  //  - ALLOW_CASE_INSENSITIVITY: ignore case of characters for special values:
+  //      infinity and nan.
+  //  - ALLOW_HEX_FLOATS: allows hexadecimal float literals.
+  //      This *must* start with "0x" and separate the exponent with "p".
+  //      Examples: 0x1.2p3 == 9.0
+  //                0x10.1p0 == 16.0625
+  //      ALLOW_HEX and ALLOW_HEX_FLOATS are indendent.
+  //
+  // empty_string_value is returned when an empty string is given as input.
+  // If ALLOW_LEADING_SPACES or ALLOW_TRAILING_SPACES are set, then a string
+  // containing only spaces is converted to the 'empty_string_value', too.
+  //
+  // junk_string_value is returned when
+  //  a) ALLOW_TRAILING_JUNK is not set, and a junk character (a character not
+  //     part of a double-literal) is found.
+  //  b) ALLOW_TRAILING_JUNK is set, but the string does not start with a
+  //     double literal.
+  //
+  // infinity_symbol and nan_symbol are strings that are used to detect
+  // inputs that represent infinity and NaN. They can be null, in which case
+  // they are ignored.
+  // The conversion routine first reads any possible signs. Then it compares the
+  // following character of the input-string with the first character of
+  // the infinity, and nan-symbol. If either matches, the function assumes, that
+  // a match has been found, and expects the following input characters to match
+  // the remaining characters of the special-value symbol.
+  // This means that the following restrictions apply to special-value symbols:
+  //  - they must not start with signs ('+', or '-'),
+  //  - they must not have the same first character.
+  //  - they must not start with digits.
+  //
+  // If the separator character is not kNoSeparator, then that specific
+  // character is ignored when in between two valid digits of the significant.
+  // It is not allowed to appear in the exponent.
+  // It is not allowed to lead or trail the number.
+  // It is not allowed to appear twice next to each other.
+  //
+  // Examples:
+  //  flags = ALLOW_HEX | ALLOW_TRAILING_JUNK,
+  //  empty_string_value = 0.0,
+  //  junk_string_value = NaN,
+  //  infinity_symbol = "infinity",
+  //  nan_symbol = "nan":
+  //    StringToDouble("0x1234") -> 4660.0.
+  //    StringToDouble("0x1234K") -> 4660.0.
+  //    StringToDouble("") -> 0.0  // empty_string_value.
+  //    StringToDouble(" ") -> NaN  // junk_string_value.
+  //    StringToDouble(" 1") -> NaN  // junk_string_value.
+  //    StringToDouble("0x") -> NaN  // junk_string_value.
+  //    StringToDouble("-123.45") -> -123.45.
+  //    StringToDouble("--123.45") -> NaN  // junk_string_value.
+  //    StringToDouble("123e45") -> 123e45.
+  //    StringToDouble("123E45") -> 123e45.
+  //    StringToDouble("123e+45") -> 123e45.
+  //    StringToDouble("123E-45") -> 123e-45.
+  //    StringToDouble("123e") -> 123.0  // trailing junk ignored.
+  //    StringToDouble("123e-") -> 123.0  // trailing junk ignored.
+  //    StringToDouble("+NaN") -> NaN  // NaN string literal.
+  //    StringToDouble("-infinity") -> -inf.  // infinity literal.
+  //    StringToDouble("Infinity") -> NaN  // junk_string_value.
+  //
+  //  flags = ALLOW_OCTAL | ALLOW_LEADING_SPACES,
+  //  empty_string_value = 0.0,
+  //  junk_string_value = NaN,
+  //  infinity_symbol = NULL,
+  //  nan_symbol = NULL:
+  //    StringToDouble("0x1234") -> NaN  // junk_string_value.
+  //    StringToDouble("01234") -> 668.0.
+  //    StringToDouble("") -> 0.0  // empty_string_value.
+  //    StringToDouble(" ") -> 0.0  // empty_string_value.
+  //    StringToDouble(" 1") -> 1.0
+  //    StringToDouble("0x") -> NaN  // junk_string_value.
+  //    StringToDouble("0123e45") -> NaN  // junk_string_value.
+  //    StringToDouble("01239E45") -> 1239e45.
+  //    StringToDouble("-infinity") -> NaN  // junk_string_value.
+  //    StringToDouble("NaN") -> NaN  // junk_string_value.
+  //
+  //  flags = NO_FLAGS,
+  //  separator = ' ':
+  //    StringToDouble("1 2 3 4") -> 1234.0
+  //    StringToDouble("1  2") -> NaN // junk_string_value
+  //    StringToDouble("1 000 000.0") -> 1000000.0
+  //    StringToDouble("1.000 000") -> 1.0
+  //    StringToDouble("1.0e1 000") -> NaN // junk_string_value
+  StringToDoubleConverter(int flags,
+                          double empty_string_value,
+                          double junk_string_value,
+                          const char* infinity_symbol,
+                          const char* nan_symbol,
+                          uc16 separator = kNoSeparator)
+      : flags_(flags),
+        empty_string_value_(empty_string_value),
+        junk_string_value_(junk_string_value),
+        infinity_symbol_(infinity_symbol),
+        nan_symbol_(nan_symbol),
+        separator_(separator) {
+  }
+
+  // Performs the conversion.
+  // The output parameter 'processed_characters_count' is set to the number
+  // of characters that have been processed to read the number.
+  // Spaces than are processed with ALLOW_{LEADING|TRAILING}_SPACES are included
+  // in the 'processed_characters_count'. Trailing junk is never included.
+  double StringToDouble(const char* buffer,
+                        int length,
+                        int* processed_characters_count) const;
+
+  // Same as StringToDouble above but for 16 bit characters.
+  double StringToDouble(const uc16* buffer,
+                        int length,
+                        int* processed_characters_count) const;
+
+  // Same as StringToDouble but reads a float.
+  // Note that this is not equivalent to static_cast<float>(StringToDouble(...))
+  // due to potential double-rounding.
+  float StringToFloat(const char* buffer,
+                      int length,
+                      int* processed_characters_count) const;
+
+  // Same as StringToFloat above but for 16 bit characters.
+  float StringToFloat(const uc16* buffer,
+                      int length,
+                      int* processed_characters_count) const;
+
+ private:
+  const int flags_;
+  const double empty_string_value_;
+  const double junk_string_value_;
+  const char* const infinity_symbol_;
+  const char* const nan_symbol_;
+  const uc16 separator_;
+
+  template <class Iterator>
+  double StringToIeee(Iterator start_pointer,
+                      int length,
+                      bool read_as_double,
+                      int* processed_characters_count) const;
+
+  DOUBLE_CONVERSION_DISALLOW_IMPLICIT_CONSTRUCTORS(StringToDoubleConverter);
+};
+
+}  // namespace double_conversion
+
+#endif  // DOUBLE_CONVERSION_STRING_TO_DOUBLE_H_