mirror of
https://github.com/robertkrimen/otto
synced 2025-10-19 19:55:30 +08:00
336 lines
6.8 KiB
Go
336 lines
6.8 KiB
Go
package otto
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import (
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"fmt"
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"math"
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"regexp"
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"strconv"
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"strings"
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)
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var stringToNumberParseInteger = regexp.MustCompile(`^(?:0[xX])`)
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func stringToFloat(value string) float64 {
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value = strings.TrimSpace(value)
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if value == "" {
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return 0
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}
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parseFloat := false
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if strings.IndexRune(value, '.') != -1 {
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parseFloat = true
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} else if stringToNumberParseInteger.MatchString(value) {
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parseFloat = false
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} else {
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parseFloat = true
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}
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if parseFloat {
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number, err := strconv.ParseFloat(value, 64)
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if err != nil && err.(*strconv.NumError).Err != strconv.ErrRange {
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return math.NaN()
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}
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return number
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}
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number, err := strconv.ParseInt(value, 0, 64)
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if err != nil {
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return math.NaN()
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}
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return float64(number)
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}
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func toNumber(value Value) Value {
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if value._valueType == valueNumber {
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return value
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}
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return Value{valueNumber, toFloat(value)}
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}
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func toFloat(value Value) float64 {
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switch value._valueType {
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case valueUndefined:
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return math.NaN()
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case valueNull:
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return 0
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}
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switch value := value.value.(type) {
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case bool:
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if value {
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return 1
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}
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return 0
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case int:
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return float64(value)
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case int8:
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return float64(value)
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case int16:
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return float64(value)
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case int32:
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return float64(value)
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case int64:
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return float64(value)
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case uint:
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return float64(value)
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case uint8:
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return float64(value)
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case uint16:
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return float64(value)
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case uint32:
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return float64(value)
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case uint64:
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return float64(value)
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case float64:
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return value
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case string:
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return stringToFloat(value)
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case *_object:
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return toFloat(value.DefaultValue(defaultValueHintNumber))
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}
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panic(fmt.Errorf("toFloat(%T)", value.value))
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}
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const (
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float_2_64 float64 = 18446744073709551616.0
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float_2_63 float64 = 9223372036854775808.0
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float_2_32 float64 = 4294967296.0
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float_2_31 float64 = 2147483648.0
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float_2_16 float64 = 65536.0
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integer_2_32 int64 = 4294967296
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integer_2_31 int64 = 2146483648
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sqrt1_2 float64 = math.Sqrt2 / 2
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)
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const (
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maxInt8 = math.MaxInt8
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minInt8 = math.MinInt8
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maxInt16 = math.MaxInt16
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minInt16 = math.MinInt16
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maxInt32 = math.MaxInt32
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minInt32 = math.MinInt32
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maxInt64 = math.MaxInt64
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minInt64 = math.MinInt64
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maxUint8 = math.MaxUint8
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maxUint16 = math.MaxUint16
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maxUint32 = math.MaxUint32
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maxUint64 = math.MaxUint64
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maxUint = ^uint(0)
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minUint = 0
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maxInt = int(^uint(0) >> 1)
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minInt = -maxInt - 1
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// int64
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int64_maxInt int64 = int64(maxInt)
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int64_minInt int64 = int64(minInt)
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int64_maxInt8 int64 = math.MaxInt8
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int64_minInt8 int64 = math.MinInt8
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int64_maxInt16 int64 = math.MaxInt16
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int64_minInt16 int64 = math.MinInt16
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int64_maxInt32 int64 = math.MaxInt32
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int64_minInt32 int64 = math.MinInt32
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int64_maxUint8 int64 = math.MaxUint8
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int64_maxUint16 int64 = math.MaxUint16
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int64_maxUint32 int64 = math.MaxUint32
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// float64
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float_maxInt float64 = float64(int(^uint(0) >> 1))
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float_minInt float64 = float64(int(-maxInt - 1))
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float_minUint float64 = float64(0)
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float_maxUint float64 = float64(uint(^uint(0)))
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float_minUint64 float64 = float64(0)
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float_maxUint64 float64 = math.MaxUint64
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float_maxInt64 float64 = math.MaxInt64
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float_minInt64 float64 = math.MinInt64
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)
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func toIntegerFloat(value Value) float64 {
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float := value.toFloat()
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if math.IsInf(float, 0) {
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} else if math.IsNaN(float) {
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float = 0
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} else if float > 0 {
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float = math.Floor(float)
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} else {
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float = math.Ceil(float)
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}
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return float
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}
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type _integerKind int
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const (
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integerValid _integerKind = iota // 3.0 => 3.0
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integerFloat // 3.14159 => 3.0
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integerInfinite // Infinity => 2**63-1
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integerInvalid // NaN => 0
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)
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type _integer struct {
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_integerKind
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value int64
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}
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func (self _integer) valid() bool {
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return self._integerKind == integerValid || self._integerKind == integerFloat
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}
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func (self _integer) exact() bool {
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return self._integerKind == integerValid
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}
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func (self _integer) infinite() bool {
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return self._integerKind == integerInfinite
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}
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func toInteger(value Value) (integer _integer) {
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switch value := value.value.(type) {
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case int8:
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integer.value = int64(value)
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return
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case int16:
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integer.value = int64(value)
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return
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case uint8:
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integer.value = int64(value)
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return
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case uint16:
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integer.value = int64(value)
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return
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case uint32:
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integer.value = int64(value)
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return
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case int:
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integer.value = int64(value)
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return
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case int64:
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integer.value = value
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return
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}
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{
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value := value.toFloat()
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if value == 0 {
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return
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}
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if math.IsNaN(value) {
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integer._integerKind = integerInvalid
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return
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}
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if math.IsInf(value, 0) {
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integer._integerKind = integerInfinite
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}
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if value >= float_maxInt64 {
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integer.value = math.MaxInt64
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return
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}
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if value <= float_minInt64 {
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integer.value = math.MinInt64
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return
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}
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{
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value0 := value
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value1 := float64(0)
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if value0 > 0 {
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value1 = math.Floor(value0)
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} else {
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value1 = math.Ceil(value0)
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}
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if value0 != value1 {
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integer._integerKind = integerFloat
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}
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integer.value = int64(value1)
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return
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}
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}
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}
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// ECMA 262: 9.5
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func toInt32(value Value) int32 {
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{
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switch value := value.value.(type) {
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case int8:
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return int32(value)
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case int16:
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return int32(value)
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case int32:
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return value
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}
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}
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floatValue := value.toFloat()
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if math.IsNaN(floatValue) || math.IsInf(floatValue, 0) {
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return 0
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}
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if floatValue == 0 { // This will work for +0 & -0
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return 0
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}
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remainder := math.Mod(floatValue, float_2_32)
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if remainder > 0 {
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remainder = math.Floor(remainder)
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} else {
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remainder = math.Ceil(remainder) + float_2_32
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}
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if remainder > float_2_31 {
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return int32(remainder - float_2_32)
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}
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return int32(remainder)
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}
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func toUint32(value Value) uint32 {
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{
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switch value := value.value.(type) {
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case int8:
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return uint32(value)
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case int16:
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return uint32(value)
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case uint8:
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return uint32(value)
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case uint16:
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return uint32(value)
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case uint32:
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return value
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}
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}
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floatValue := value.toFloat()
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if math.IsNaN(floatValue) || math.IsInf(floatValue, 0) {
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return 0
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}
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if floatValue == 0 {
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return 0
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}
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remainder := math.Mod(floatValue, float_2_32)
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if remainder > 0 {
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remainder = math.Floor(remainder)
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} else {
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remainder = math.Ceil(remainder) + float_2_32
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}
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return uint32(remainder)
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}
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func toUint16(value Value) uint16 {
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{
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switch value := value.value.(type) {
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case int8:
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return uint16(value)
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case uint8:
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return uint16(value)
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case uint16:
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return value
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}
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}
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floatValue := value.toFloat()
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if math.IsNaN(floatValue) || math.IsInf(floatValue, 0) {
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return 0
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}
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if floatValue == 0 {
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return 0
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}
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remainder := math.Mod(floatValue, float_2_16)
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if remainder > 0 {
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remainder = math.Floor(remainder)
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} else {
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remainder = math.Ceil(remainder) + float_2_16
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}
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return uint16(remainder)
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}
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