Split double-conversion. (#104)
Separates the two main classes into separate c and h files.
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_