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


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package otto

import (
    "fmt"
    "math"
    "reflect"
    "unicode/utf16"
)

func (value Value) bool() bool {
    if value.kind == valueBoolean {
        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))
    }
    if value.IsObject() {
        return true
    }
    panic(fmt.Errorf("toBoolean(%T)", value.value))
}