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|
package otto
import (
"fmt"
"math"
"regexp"
"strconv"
"strings"
)
var stringToNumberParseInteger = regexp.MustCompile(`^(?:0[xX])`)
func stringToFloat(value string) float64 {
value = strings.TrimSpace(value)
if value == "" {
return 0
}
parseFloat := false
if strings.IndexRune(value, '.') != -1 {
parseFloat = true
} else if stringToNumberParseInteger.MatchString(value) {
parseFloat = false
} else {
parseFloat = true
}
if parseFloat {
number, err := strconv.ParseFloat(value, 64)
if err != nil && err.(*strconv.NumError).Err != strconv.ErrRange {
return math.NaN()
}
return number
}
number, err := strconv.ParseInt(value, 0, 64)
if err != nil {
return math.NaN()
}
return float64(number)
}
func toNumber(value Value) Value {
if value._valueType == valueNumber {
return value
}
return Value{valueNumber, toFloat(value)}
}
func toFloat(value Value) float64 {
switch value._valueType {
case valueUndefined:
return math.NaN()
case valueNull:
return 0
}
switch value := value.value.(type) {
case bool:
if value {
return 1
}
return 0
case int:
return float64(value)
case int8:
return float64(value)
case int16:
return float64(value)
case int32:
return float64(value)
case int64:
return float64(value)
case uint:
return float64(value)
case uint8:
return float64(value)
case uint16:
return float64(value)
case uint32:
return float64(value)
case uint64:
return float64(value)
case float64:
return value
case string:
return stringToFloat(value)
case *_object:
return toFloat(value.DefaultValue(defaultValueHintNumber))
}
panic(fmt.Errorf("toFloat(%T)", value.value))
}
const (
float_2_64 float64 = 18446744073709551616.0
float_2_63 float64 = 9223372036854775808.0
float_2_32 float64 = 4294967296.0
float_2_31 float64 = 2147483648.0
float_2_16 float64 = 65536.0
integer_2_32 int64 = 4294967296
integer_2_31 int64 = 2146483648
sqrt1_2 float64 = math.Sqrt2 / 2
)
const (
maxInt8 = math.MaxInt8
minInt8 = math.MinInt8
maxInt16 = math.MaxInt16
minInt16 = math.MinInt16
maxInt32 = math.MaxInt32
minInt32 = math.MinInt32
maxInt64 = math.MaxInt64
minInt64 = math.MinInt64
maxUint8 = math.MaxUint8
maxUint16 = math.MaxUint16
maxUint32 = math.MaxUint32
maxUint64 = math.MaxUint64
maxUint = ^uint(0)
minUint = 0
maxInt = int(^uint(0) >> 1)
minInt = -maxInt - 1
// int64
int64_maxInt int64 = int64(maxInt)
int64_minInt int64 = int64(minInt)
int64_maxInt8 int64 = math.MaxInt8
int64_minInt8 int64 = math.MinInt8
int64_maxInt16 int64 = math.MaxInt16
int64_minInt16 int64 = math.MinInt16
int64_maxInt32 int64 = math.MaxInt32
int64_minInt32 int64 = math.MinInt32
int64_maxUint8 int64 = math.MaxUint8
int64_maxUint16 int64 = math.MaxUint16
int64_maxUint32 int64 = math.MaxUint32
// float64
float_maxInt float64 = float64(int(^uint(0) >> 1))
float_minInt float64 = float64(int(-maxInt - 1))
float_minUint float64 = float64(0)
float_maxUint float64 = float64(uint(^uint(0)))
float_minUint64 float64 = float64(0)
float_maxUint64 float64 = math.MaxUint64
float_maxInt64 float64 = math.MaxInt64
float_minInt64 float64 = math.MinInt64
)
func toIntegerFloat(value Value) float64 {
float := value.toFloat()
if math.IsInf(float, 0) {
} else if math.IsNaN(float) {
float = 0
} else if float > 0 {
float = math.Floor(float)
} else {
float = math.Ceil(float)
}
return float
}
type _integerKind int
const (
integerValid _integerKind = iota // 3.0 => 3.0
integerFloat // 3.14159 => 3.0
integerInfinite // Infinity => 2**63-1
integerInvalid // NaN => 0
)
type _integer struct {
_integerKind
value int64
}
func (self _integer) valid() bool {
return self._integerKind == integerValid || self._integerKind == integerFloat
}
func (self _integer) exact() bool {
return self._integerKind == integerValid
}
func (self _integer) infinite() bool {
return self._integerKind == integerInfinite
}
func toInteger(value Value) (integer _integer) {
switch value := value.value.(type) {
case int8:
integer.value = int64(value)
return
case int16:
integer.value = int64(value)
return
case uint8:
integer.value = int64(value)
return
case uint16:
integer.value = int64(value)
return
case uint32:
integer.value = int64(value)
return
case int:
integer.value = int64(value)
return
case int64:
integer.value = value
return
}
{
value := value.toFloat()
if value == 0 {
return
}
if math.IsNaN(value) {
integer._integerKind = integerInvalid
return
}
if math.IsInf(value, 0) {
integer._integerKind = integerInfinite
}
if value >= float_maxInt64 {
integer.value = math.MaxInt64
return
}
if value <= float_minInt64 {
integer.value = math.MinInt64
return
}
{
value0 := value
value1 := float64(0)
if value0 > 0 {
value1 = math.Floor(value0)
} else {
value1 = math.Ceil(value0)
}
if value0 != value1 {
integer._integerKind = integerFloat
}
integer.value = int64(value1)
return
}
}
}
// ECMA 262: 9.5
func toInt32(value Value) int32 {
{
switch value := value.value.(type) {
case int8:
return int32(value)
case int16:
return int32(value)
case int32:
return value
}
}
floatValue := value.toFloat()
if math.IsNaN(floatValue) || math.IsInf(floatValue, 0) {
return 0
}
if floatValue == 0 { // This will work for +0 & -0
return 0
}
remainder := math.Mod(floatValue, float_2_32)
if remainder > 0 {
remainder = math.Floor(remainder)
} else {
remainder = math.Ceil(remainder) + float_2_32
}
if remainder > float_2_31 {
return int32(remainder - float_2_32)
}
return int32(remainder)
}
func toUint32(value Value) uint32 {
{
switch value := value.value.(type) {
case int8:
return uint32(value)
case int16:
return uint32(value)
case uint8:
return uint32(value)
case uint16:
return uint32(value)
case uint32:
return value
}
}
floatValue := value.toFloat()
if math.IsNaN(floatValue) || math.IsInf(floatValue, 0) {
return 0
}
if floatValue == 0 {
return 0
}
remainder := math.Mod(floatValue, float_2_32)
if remainder > 0 {
remainder = math.Floor(remainder)
} else {
remainder = math.Ceil(remainder) + float_2_32
}
return uint32(remainder)
}
func toUint16(value Value) uint16 {
{
switch value := value.value.(type) {
case int8:
return uint16(value)
case uint8:
return uint16(value)
case uint16:
return value
}
}
floatValue := value.toFloat()
if math.IsNaN(floatValue) || math.IsInf(floatValue, 0) {
return 0
}
if floatValue == 0 {
return 0
}
remainder := math.Mod(floatValue, float_2_16)
if remainder > 0 {
remainder = math.Floor(remainder)
} else {
remainder = math.Ceil(remainder) + float_2_16
}
return uint16(remainder)
}
|
