diff options
Diffstat (limited to 'vendor/github.com/dustin/go-humanize/si.go')
-rw-r--r-- | vendor/github.com/dustin/go-humanize/si.go | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/vendor/github.com/dustin/go-humanize/si.go b/vendor/github.com/dustin/go-humanize/si.go deleted file mode 100644 index ae659e0e..00000000 --- a/vendor/github.com/dustin/go-humanize/si.go +++ /dev/null @@ -1,123 +0,0 @@ -package humanize - -import ( - "errors" - "math" - "regexp" - "strconv" -) - -var siPrefixTable = map[float64]string{ - -24: "y", // yocto - -21: "z", // zepto - -18: "a", // atto - -15: "f", // femto - -12: "p", // pico - -9: "n", // nano - -6: "µ", // micro - -3: "m", // milli - 0: "", - 3: "k", // kilo - 6: "M", // mega - 9: "G", // giga - 12: "T", // tera - 15: "P", // peta - 18: "E", // exa - 21: "Z", // zetta - 24: "Y", // yotta -} - -var revSIPrefixTable = revfmap(siPrefixTable) - -// revfmap reverses the map and precomputes the power multiplier -func revfmap(in map[float64]string) map[string]float64 { - rv := map[string]float64{} - for k, v := range in { - rv[v] = math.Pow(10, k) - } - return rv -} - -var riParseRegex *regexp.Regexp - -func init() { - ri := `^([\-0-9.]+)\s?([` - for _, v := range siPrefixTable { - ri += v - } - ri += `]?)(.*)` - - riParseRegex = regexp.MustCompile(ri) -} - -// ComputeSI finds the most appropriate SI prefix for the given number -// and returns the prefix along with the value adjusted to be within -// that prefix. -// -// See also: SI, ParseSI. -// -// e.g. ComputeSI(2.2345e-12) -> (2.2345, "p") -func ComputeSI(input float64) (float64, string) { - if input == 0 { - return 0, "" - } - mag := math.Abs(input) - exponent := math.Floor(logn(mag, 10)) - exponent = math.Floor(exponent/3) * 3 - - value := mag / math.Pow(10, exponent) - - // Handle special case where value is exactly 1000.0 - // Should return 1 M instead of 1000 k - if value == 1000.0 { - exponent += 3 - value = mag / math.Pow(10, exponent) - } - - value = math.Copysign(value, input) - - prefix := siPrefixTable[exponent] - return value, prefix -} - -// SI returns a string with default formatting. -// -// SI uses Ftoa to format float value, removing trailing zeros. -// -// See also: ComputeSI, ParseSI. -// -// e.g. SI(1000000, "B") -> 1 MB -// e.g. SI(2.2345e-12, "F") -> 2.2345 pF -func SI(input float64, unit string) string { - value, prefix := ComputeSI(input) - return Ftoa(value) + " " + prefix + unit -} - -// SIWithDigits works like SI but limits the resulting string to the -// given number of decimal places. -// -// e.g. SIWithDigits(1000000, 0, "B") -> 1 MB -// e.g. SIWithDigits(2.2345e-12, 2, "F") -> 2.23 pF -func SIWithDigits(input float64, decimals int, unit string) string { - value, prefix := ComputeSI(input) - return FtoaWithDigits(value, decimals) + " " + prefix + unit -} - -var errInvalid = errors.New("invalid input") - -// ParseSI parses an SI string back into the number and unit. -// -// See also: SI, ComputeSI. -// -// e.g. ParseSI("2.2345 pF") -> (2.2345e-12, "F", nil) -func ParseSI(input string) (float64, string, error) { - found := riParseRegex.FindStringSubmatch(input) - if len(found) != 4 { - return 0, "", errInvalid - } - mag := revSIPrefixTable[found[2]] - unit := found[3] - - base, err := strconv.ParseFloat(found[1], 64) - return base * mag, unit, err -} |