package util import ( "github.com/c9s/bbgo/pkg/fixedpoint" "math" "strconv" ) const MaxDigits = 18 // MAX_INT64 ~ 9 * 10^18 var Pow10Table = [MaxDigits + 1]int64{ 1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 1e9, 1e10, 1e11, 1e12, 1e13, 1e14, 1e15, 1e16, 1e17, 1e18, } func Pow10(n int64) int64 { if n < 0 || n > MaxDigits { return 0 } return Pow10Table[n] } func FormatValue(val fixedpoint.Value, prec int) string { return val.FormatString(prec) } func FormatFloat(val float64, prec int) string { return strconv.FormatFloat(val, 'f', prec, 64) } func ParseFloat(s string) (float64, error) { if len(s) == 0 { return 0.0, nil } return strconv.ParseFloat(s, 64) } func MustParseFloat(s string) float64 { if len(s) == 0 { return 0.0 } v, err := strconv.ParseFloat(s, 64) if err != nil { panic(err) } return v } const epsilon = 0.0000001 func Zero(v float64) bool { return math.Abs(v) < epsilon } func NotZero(v float64) bool { return math.Abs(v) > epsilon }