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type-float.go
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type-float.go
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package series
import (
"fmt"
"math"
"strconv"
)
type floatElement struct {
e float64
nan bool
}
// force floatElement struct to implement Element interface
var _ Element = (*floatElement)(nil)
func (e *floatElement) Set(value interface{}) {
e.nan = false
switch val := value.(type) {
case string:
if val == "NaN" {
e.nan = true
return
}
f, err := strconv.ParseFloat(value.(string), 64)
if err != nil {
e.nan = true
return
}
e.e = f
case int:
e.e = float64(val)
case float64:
e.e = float64(val)
case bool:
b := val
if b {
e.e = 1
} else {
e.e = 0
}
case Element:
e.e = val.Float()
default:
e.nan = true
return
}
}
func (e floatElement) Copy() Element {
if e.IsNA() {
return &floatElement{0.0, true}
}
return &floatElement{e.e, false}
}
func (e floatElement) IsNA() bool {
if e.nan || math.IsNaN(e.e) {
return true
}
return false
}
func (e floatElement) Type() Type {
return Float
}
func (e floatElement) Val() ElementValue {
if e.IsNA() {
return nil
}
return float64(e.e)
}
func (e floatElement) String() string {
if e.IsNA() {
return "NaN"
}
return fmt.Sprintf("%f", e.e)
}
func (e floatElement) Int() (int, error) {
if e.IsNA() {
return 0, fmt.Errorf("can't convert NaN to int")
}
f := e.e
if math.IsInf(f, 1) || math.IsInf(f, -1) {
return 0, fmt.Errorf("can't convert Inf to int")
}
if math.IsNaN(f) {
return 0, fmt.Errorf("can't convert NaN to int")
}
return int(f), nil
}
func (e floatElement) Float() float64 {
if e.IsNA() {
return math.NaN()
}
return float64(e.e)
}
func (e floatElement) Bool() (bool, error) {
if e.IsNA() {
return false, fmt.Errorf("can't convert NaN to bool")
}
switch e.e {
case 1:
return true, nil
case 0:
return false, nil
}
return false, fmt.Errorf("can't convert Float \"%v\" to bool", e.e)
}
func (e floatElement) Eq(elem Element) bool {
f := elem.Float()
if e.IsNA() || math.IsNaN(f) {
return false
}
return e.e == f
}
func (e floatElement) Neq(elem Element) bool {
f := elem.Float()
if e.IsNA() || math.IsNaN(f) {
return false
}
return e.e != f
}
func (e floatElement) Less(elem Element) bool {
f := elem.Float()
if e.IsNA() || math.IsNaN(f) {
return false
}
return e.e < f
}
func (e floatElement) LessEq(elem Element) bool {
f := elem.Float()
if e.IsNA() || math.IsNaN(f) {
return false
}
return e.e <= f
}
func (e floatElement) Greater(elem Element) bool {
f := elem.Float()
if e.IsNA() || math.IsNaN(f) {
return false
}
return e.e > f
}
func (e floatElement) GreaterEq(elem Element) bool {
f := elem.Float()
if e.IsNA() || math.IsNaN(f) {
return false
}
return e.e >= f
}