plugeth/vendor/github.com/robertkrimen/otto/value_boolean.go

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package otto
import (
"fmt"
"math"
"reflect"
"unicode/utf16"
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)
func (value Value) bool() bool {
if value.kind == valueBoolean {
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return value.value.(bool)
}
if value.IsUndefined() {
return false
}
if value.IsNull() {
return false
}
switch value := value.value.(type) {
case bool:
return value
case int, int8, int16, int32, int64:
return 0 != reflect.ValueOf(value).Int()
case uint, uint8, uint16, uint32, uint64:
return 0 != reflect.ValueOf(value).Uint()
case float32:
return 0 != value
case float64:
if math.IsNaN(value) || value == 0 {
return false
}
return true
case string:
return 0 != len(value)
case []uint16:
return 0 != len(utf16.Decode(value))
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}
if value.IsObject() {
return true
}
panic(fmt.Errorf("toBoolean(%T)", value.value))
}