117 lines
2.4 KiB
Go
117 lines
2.4 KiB
Go
package humanize
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import (
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"bytes"
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"math"
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"math/big"
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"strconv"
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"strings"
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)
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// Comma produces a string form of the given number in base 10 with
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// commas after every three orders of magnitude.
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//
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// e.g. Comma(834142) -> 834,142
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func Comma(v int64) string {
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sign := ""
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// Min int64 can't be negated to a usable value, so it has to be special cased.
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if v == math.MinInt64 {
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return "-9,223,372,036,854,775,808"
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}
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if v < 0 {
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sign = "-"
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v = 0 - v
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}
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parts := []string{"", "", "", "", "", "", ""}
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j := len(parts) - 1
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for v > 999 {
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parts[j] = strconv.FormatInt(v%1000, 10)
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switch len(parts[j]) {
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case 2:
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parts[j] = "0" + parts[j]
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case 1:
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parts[j] = "00" + parts[j]
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}
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v = v / 1000
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j--
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}
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parts[j] = strconv.Itoa(int(v))
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return sign + strings.Join(parts[j:], ",")
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}
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// Commaf produces a string form of the given number in base 10 with
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// commas after every three orders of magnitude.
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//
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// e.g. Commaf(834142.32) -> 834,142.32
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func Commaf(v float64) string {
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buf := &bytes.Buffer{}
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if v < 0 {
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buf.Write([]byte{'-'})
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v = 0 - v
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}
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comma := []byte{','}
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parts := strings.Split(strconv.FormatFloat(v, 'f', -1, 64), ".")
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pos := 0
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if len(parts[0])%3 != 0 {
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pos += len(parts[0]) % 3
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buf.WriteString(parts[0][:pos])
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buf.Write(comma)
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}
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for ; pos < len(parts[0]); pos += 3 {
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buf.WriteString(parts[0][pos : pos+3])
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buf.Write(comma)
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}
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buf.Truncate(buf.Len() - 1)
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if len(parts) > 1 {
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buf.Write([]byte{'.'})
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buf.WriteString(parts[1])
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}
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return buf.String()
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}
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// CommafWithDigits works like the Commaf but limits the resulting
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// string to the given number of decimal places.
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//
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// e.g. CommafWithDigits(834142.32, 1) -> 834,142.3
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func CommafWithDigits(f float64, decimals int) string {
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return stripTrailingDigits(Commaf(f), decimals)
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}
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// BigComma produces a string form of the given big.Int in base 10
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// with commas after every three orders of magnitude.
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func BigComma(b *big.Int) string {
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sign := ""
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if b.Sign() < 0 {
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sign = "-"
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b.Abs(b)
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}
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athousand := big.NewInt(1000)
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c := (&big.Int{}).Set(b)
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_, m := oom(c, athousand)
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parts := make([]string, m+1)
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j := len(parts) - 1
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mod := &big.Int{}
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for b.Cmp(athousand) >= 0 {
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b.DivMod(b, athousand, mod)
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parts[j] = strconv.FormatInt(mod.Int64(), 10)
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switch len(parts[j]) {
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case 2:
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parts[j] = "0" + parts[j]
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case 1:
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parts[j] = "00" + parts[j]
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}
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j--
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}
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parts[j] = strconv.Itoa(int(b.Int64()))
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return sign + strings.Join(parts[j:], ",")
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}
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