forked from aergoio/aergo
/
unit.go
73 lines (67 loc) · 1.62 KB
/
unit.go
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package util
import (
"fmt"
"math/big"
"strconv"
"strings"
)
//var unit map[string]*big.Int
var units map[string]int
var unitlist []string
func init() {
units = map[string]int{}
units["aergo"] = 18
units["gaer"] = 9
units["aer"] = 0
unitlist = []string{"aergo", "gaer", "aer"}
}
func ParseUnit(s string) (*big.Int, error) {
result, ok := new(big.Int).SetString(strings.TrimSpace(s), 10)
if !ok {
lower := strings.ToLower(s)
for _, v := range unitlist {
if strings.Contains(lower, v) {
number := strings.TrimSpace(strings.TrimSuffix(lower, v))
numbers := strings.Split(number, ".")
var nstr string
var pos int
switch len(numbers) {
case 1:
nstr = numbers[0]
pos = 0
case 2:
if len(numbers[1]) > units[v] {
return big.NewInt(0), fmt.Errorf("too small unit %s", s)
}
nstr = numbers[0] + numbers[1]
pos = len(numbers[1])
default:
continue
}
for i := pos; i < units[v]; i++ {
nstr += "0"
}
n, ok := new(big.Int).SetString(nstr, 10)
if !ok {
continue
} else {
return n, nil
}
}
}
return big.NewInt(0), fmt.Errorf("could not parse %s", s)
}
return result, nil
}
func ConvertUnit(n *big.Int, unit string) (string, error) {
unit = strings.ToLower(unit)
nstr := n.String()
if len(nstr) > units[unit] {
dotpos := len(nstr) - units[unit]
nstr = nstr[0:dotpos] + "." + nstr[dotpos:]
return strings.TrimRight(strings.TrimRight(nstr, "0"), ".") + " " + unit, nil
}
result := strings.TrimRight(fmt.Sprintf(".%0"+strconv.Itoa(units[unit])+"d", n), ".0")
result = "0" + result + " " + unit
return result, nil
}