137 lines
2.7 KiB
Go
137 lines
2.7 KiB
Go
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package formatter
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import (
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"fmt"
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"math"
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"strconv"
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"strings"
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"github.com/samber/lo"
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)
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type IntervalsInSecondsType map[Interval]int
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type Interval string
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const (
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Year Interval = "year"
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Month Interval = "month"
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Week Interval = "week"
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Day Interval = "day"
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Hour Interval = "hour"
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Minute Interval = "minute"
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Second Interval = "second"
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Millisecond Interval = "millisecond"
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)
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var Units = []Interval{
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Year,
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Month,
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Week,
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Day,
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Hour,
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Minute,
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Second,
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Millisecond,
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}
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var IntervalsInSeconds = IntervalsInSecondsType{
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Year: 31536000,
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Month: 2592000,
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Week: 604800,
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Day: 86400,
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Hour: 3600,
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Minute: 60,
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Second: 1,
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Millisecond: 1,
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}
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type DecimalCount *int
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func toFixed(value float64, decimals DecimalCount) string {
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if value == 0 {
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return strconv.FormatFloat(value, 'f', getDecimalsForValue(value), 64)
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}
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if math.IsInf(value, 0) {
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return strconv.FormatFloat(value, 'f', -1, 64)
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}
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if decimals == nil {
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count := getDecimalsForValue(value)
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decimals = &count
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}
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factor := math.Pow(10, math.Max(0, float64(*decimals)))
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formatted := strconv.FormatFloat(math.Round(value*factor)/factor, 'f', -1, 64)
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if formatted == "NaN" {
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return ""
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}
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if formatted == "-0" {
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formatted = "0"
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}
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if value == 0 || strings.Contains(formatted, "e") {
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return formatted
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}
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decimalPos := strings.Index(formatted, ".")
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precision := 0
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if decimalPos != -1 {
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precision = len(formatted) - decimalPos - 1
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if precision < *decimals {
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return formatted + strings.Repeat("0", *decimals-precision)
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}
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}
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return formatted
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}
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func toFixedScaled(value float64, decimals DecimalCount, scaleFormat string) string {
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return toFixed(value, decimals) + scaleFormat
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}
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func getDecimalsForValue(value float64) int {
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absValue := math.Abs(value)
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log10 := math.Floor(math.Log10(absValue))
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dec := int(-log10 + 1)
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magn := math.Pow10(-dec)
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norm := absValue / magn
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if norm > 2.25 {
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dec++
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}
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if math.Mod(value, 1) == 0 {
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dec = 0
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}
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return int(math.Max(float64(dec), 0))
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}
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type ValueFormatter func(value float64, decimals *int) string
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func logb(base, x float64) float64 {
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return math.Log10(x) / math.Log10(base)
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}
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func scaledUnits(factor float64, extArray []string, offset int) ValueFormatter {
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return func(value float64, decimals *int) string {
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if value == 0 || math.IsNaN(value) || math.IsInf(value, 0) {
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return fmt.Sprintf("%f", value)
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}
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siIndex := int(math.Floor(logb(factor, math.Abs(value))))
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if value < 0 {
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siIndex = -siIndex
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}
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siIndex = lo.Clamp(siIndex+offset, 0, len(extArray)-1)
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suffix := extArray[siIndex]
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return toFixed(value/math.Pow(factor, float64(siIndex-offset)), decimals) + suffix
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}
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}
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