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decimal.go
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decimal.go
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package utils
import (
"math"
"math/big"
"github.com/pkg/errors"
"github.com/shopspring/decimal"
)
// ToDecimal converts an input to a decimal
func ToDecimal(input interface{}) (decimal.Decimal, error) {
switch v := input.(type) {
case string:
return decimal.NewFromString(v)
case int:
return decimal.New(int64(v), 0), nil
case int8:
return decimal.New(int64(v), 0), nil
case int16:
return decimal.New(int64(v), 0), nil
case int32:
return decimal.New(int64(v), 0), nil
case int64:
return decimal.New(v, 0), nil
case uint:
return decimal.New(int64(v), 0), nil
case uint8:
return decimal.New(int64(v), 0), nil
case uint16:
return decimal.New(int64(v), 0), nil
case uint32:
return decimal.New(int64(v), 0), nil
case uint64:
return decimal.New(int64(v), 0), nil
case float64:
if !validFloat(v) {
return decimal.Decimal{}, errors.Errorf("invalid float %v, cannot convert to decimal", v)
}
return decimal.NewFromFloat(v), nil
case float32:
if !validFloat(float64(v)) {
return decimal.Decimal{}, errors.Errorf("invalid float %v, cannot convert to decimal", v)
}
return decimal.NewFromFloat32(v), nil
case big.Int:
return decimal.NewFromBigInt(&v, 0), nil
case *big.Int:
return decimal.NewFromBigInt(v, 0), nil
case decimal.Decimal:
return v, nil
case *decimal.Decimal:
return *v, nil
default:
return decimal.Decimal{}, errors.Errorf("type %T cannot be converted to decimal.Decimal (%v)", input, input)
}
}
func validFloat(f float64) bool {
return !math.IsNaN(f) && !math.IsInf(f, 0)
}