forked from robertkrimen/otto
/
value.go
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/
value.go
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package otto
import (
"math"
)
type _valueType int
const (
valueEmpty _valueType = iota
valueNull
valueUndefined
valueNumber
valueString
valueBoolean
valueObject
valueReference
)
// Value is the representation of a JavaScript value.
type Value struct {
_valueType
value interface{}
}
func ToValue(value interface{}) (Value, error) {
result := UndefinedValue()
err := catchPanic(func(){
result = toValue(value)
})
return result, err
}
// Empty
func emptyValue() Value {
return Value{_valueType: valueEmpty}
}
func (value Value) isEmpty() bool {
return value._valueType == valueEmpty
}
// Undefined
// UndefinedValue will return a Value representing undefined.
func UndefinedValue() Value {
return Value{_valueType: valueUndefined}
}
// IsDefined will return false if the value is undefined, and true otherwise.
func (value Value) IsDefined() bool {
return value._valueType != valueUndefined
}
// IsUndefined will return true if the value is undefined, and false otherwise.
func (value Value) IsUndefined() bool {
return value._valueType == valueUndefined
}
// Any nil will do -- we just make a new throwaway type here
// NullValue will return a Value representing null.
func NullValue() Value {
return Value{_valueType: valueNull}
}
// IsNull will return true if the value is null, and false otherwise.
func (value Value) IsNull() bool {
return value._valueType == valueNull
}
// ---
func (value Value) isCallable() bool {
switch value := value.value.(type) {
case *_object:
return value._Function != nil
}
return false
}
func (value Value) isReference() bool {
return value._valueType == valueReference
}
// Call the value as a function with the given this value and argument list and
// return the result of invocation. It is essentially equivalent to:
//
// value.apply(thisValue, argumentList)
//
// An undefined value and an error will result if:
//
// 1. There is an error during conversion of the argument list
// 2. The value is not actually a function
// 3. An (uncaught) exception is thrown
//
func (value Value) Call(this Value, argumentList... interface{}) (Value, error) {
result := UndefinedValue()
err := catchPanic(func(){
result = value.call(this, argumentList...)
})
return result, err
}
func (value Value) call(this Value, argumentList... interface{}) Value {
switch value := value.value.(type) {
case *_object:
return value.Call(this, argumentList...)
}
panic(newTypeError())
}
// IsPrimitive will return true if value is a primitive (any kind of primitive).
func (value Value) IsPrimitive() bool {
return ! value.IsObject()
}
// IsBoolean will return true if value is a boolean (primitive).
func (value Value) IsBoolean() bool {
return value._valueType == valueBoolean
}
// IsNumber will return true if value is a number (primitive).
func (value Value) IsNumber() bool {
return value._valueType == valueNumber
}
// IsNaN will return true if value is NaN (or would convert to NaN).
func (value Value) IsNaN() bool {
switch value := value.value.(type) {
case float64:
return math.IsNaN(value)
case float32:
return math.IsNaN(float64(value))
case int, int8, int32, int64:
return false
case uint, uint8, uint32, uint64:
return false
}
return math.IsNaN(toFloat(value))
}
// IsString will return true if value is a string (primitive).
func (value Value) IsString() bool {
return value._valueType == valueString
}
// IsObject will return true if value is an object.
func (value Value) IsObject() bool {
return value._valueType == valueObject
}
// IsFunction will return true if value is a function.
func (value Value) IsFunction() bool {
if value._valueType != valueObject {
return false
}
return value.value.(*_object).class == "Function"
}
// Class will return the class string of the value or the empty string if value is not an object.
//
// The return value will (generally) be one of:
//
// Object
// Function
// Array
// String
// Number
// Boolean
// Date
// RegExp
//
func (value Value) Class() string {
if value._valueType != valueObject {
return ""
}
return value.value.(*_object).class
}
func (value Value) isArray() bool {
if value._valueType != valueObject {
return false
}
return value.value.(*_object).class == "Array"
}
func (value Value) isStringObject() bool {
if value._valueType != valueObject {
return false
}
return value.value.(*_object).class == "String"
}
func (value Value) isBooleanObject() bool {
if value._valueType != valueObject {
return false
}
return value.value.(*_object).class == "Boolean"
}
func (value Value) isNumberObject() bool {
if value._valueType != valueObject {
return false
}
return value.value.(*_object).class == "Number"
}
func (value Value) isDate() bool {
if value._valueType != valueObject {
return false
}
return value.value.(*_object).class == "Date"
}
func (value Value) isRegExp() bool {
if value._valueType != valueObject {
return false
}
return value.value.(*_object).class == "RegExp"
}
func (value Value) isError() bool {
if value._valueType != valueObject {
return false
}
return value.value.(*_object).class == "Error"
}
// ---
func toValue(value interface{}) Value {
switch value := value.(type) {
case Value:
return value
case bool:
return Value{valueBoolean, value}
case int:
return Value{valueNumber, value}
case int8:
return Value{valueNumber, value}
case int16:
return Value{valueNumber, value}
case int32:
return Value{valueNumber, value}
case int64:
return Value{valueNumber, value}
case uint:
return Value{valueNumber, value}
case uint8:
return Value{valueNumber, value}
case uint16:
return Value{valueNumber, value}
case uint32:
return Value{valueNumber, value}
case uint64:
return Value{valueNumber, value}
case float32:
return Value{valueNumber, float64(value)}
case float64:
return Value{valueNumber, value}
case string:
return Value{valueString, value}
// A rune is actually an int32, which is handled above
case *_object:
return Value{valueObject, value}
case *Object:
return Value{valueObject, value.object}
case Object:
return Value{valueObject, value.object}
case _reference: // reference is an interface (already a pointer)
return Value{valueReference, value}
}
panic(newTypeError("Unable to convert value: %v (%T)", value, value))
}
// String will return the value as a string.
//
// This method will make return the empty string if there is an error.
func (value Value) String() string {
result := ""
catchPanic(func(){
result = value.toString()
})
return result
}
func (value Value) toBoolean() bool {
return toBoolean(value)
}
// ToBoolean will convert the value to a boolean (bool).
//
// ToValue(0).ToBoolean() => false
// ToValue("").ToBoolean() => false
// ToValue(true).ToBoolean() => true
// ToValue(1).ToBoolean() => true
// ToValue("Nothing happens").ToBoolean() => true
//
// If there is an error during the conversion process (like an uncaught exception), then the result will be false and an error.
func (value Value) ToBoolean() (bool, error) {
result := false
err := catchPanic(func(){
result = toBoolean(value)
})
return result, err
}
func (value Value) toNumber() Value {
return toNumber(value)
}
func (value Value) toFloat() float64 {
return toFloat(value)
}
// ToFloat will convert the value to a number (float64).
//
// ToValue(0).ToFloat() => 0.
// ToValue(1.1).ToFloat() => 1.1
// ToValue("11").ToFloat() => 11.
//
// If there is an error during the conversion process (like an uncaught exception), then the result will be 0 and an error.
func (value Value) ToFloat() (float64, error) {
result := float64(0)
err := catchPanic(func(){
result = toFloat(value)
})
return result, err
}
// ToInteger will convert the value to a number (int64).
//
// ToValue(0).ToInteger() => 0
// ToValue(1.1).ToInteger() => 1
// ToValue("11").ToInteger() => 11
//
// If there is an error during the conversion process (like an uncaught exception), then the result will be 0 and an error.
func (value Value) ToInteger() (int64, error) {
result := int64(0)
err := catchPanic(func(){
result = toInteger(value)
})
return result, err
}
func (value Value) toString() string {
return toString(value)
}
// ToString will convert the value to a string (string).
//
// ToValue(0).ToString() => "0"
// ToValue(false).ToString() => "false"
// ToValue(1.1).ToString() => "1.1"
// ToValue("11").ToString() => "11"
// ToValue('Nothing happens.').ToString() => "Nothing happens."
//
// If there is an error during the conversion process (like an uncaught exception), then the result will be the empty string ("") and an error.
func (value Value) ToString() (string, error) {
result := ""
err := catchPanic(func(){
result = toString(value)
})
return result, err
}
func (value Value) _object() *_object {
switch value := value.value.(type) {
case *_object:
return value
}
return nil
}
// Object will return the object of the value, or nil if value is not an object.
//
// This method will not do any implicit conversion. For example, calling this method on a string primitive value will not return a String object.
func (value Value) Object() *Object {
switch object := value.value.(type) {
case *_object:
return _newObject(object, value)
}
return nil
}
func (value Value) reference() _reference {
switch value := value.value.(type) {
case _reference:
return value
}
return nil
}
var __NaN__, __PositiveInfinity__, __NegativeInfinity__, __PositiveZero__, __NegativeZero__ float64
func init() {
__NaN__ = math.NaN()
__PositiveInfinity__ = math.Inf(+1)
__NegativeInfinity__ = math.Inf(-1)
__PositiveZero__ = 0
__NegativeZero__ = math.Float64frombits(0|(1<<63))
}
func positiveInfinity() float64 {
return __PositiveInfinity__
}
func negativeInfinity() float64 {
return __NegativeInfinity__
}
func positiveZero() float64 {
return __PositiveZero__
}
func negativeZero() float64 {
return __NegativeZero__
}
// NaNValue will return a value representing NaN.
//
// It is equivalent to:
//
// ToValue(math.NaN())
//
func NaNValue() Value {
return Value{valueNumber, __NaN__}
}
func positiveInfinityValue() Value {
return Value{valueNumber, __PositiveInfinity__}
}
func negativeInfinityValue() Value {
return Value{valueNumber, __NegativeInfinity__}
}
func positiveZeroValue() Value {
return Value{valueNumber, __PositiveZero__}
}
func negativeZeroValue() Value {
return Value{valueNumber, __NegativeZero__}
}
// TrueValue will return a value represting true.
//
// It is equivalent to:
//
// ToValue(true)
//
func TrueValue() Value {
return Value{valueBoolean, true}
}
// FalseValue will return a value represting false.
//
// It is equivalent to:
//
// ToValue(false)
//
func FalseValue() Value {
return Value{valueBoolean, false}
}
func sameValue(x Value, y Value) bool {
if x._valueType != y._valueType {
return false
}
result := false
switch x._valueType {
case valueUndefined, valueNull:
result = true
case valueNumber:
x := x.toFloat()
y := y.toFloat()
if math.IsNaN(x) && math.IsNaN(y) {
result = true
} else {
result = x == y
if result && x == 0 {
// Since +0 != -0
result = math.Signbit(x) == math.Signbit(y)
}
}
case valueString:
result = x.toString() == y.toString()
case valueBoolean:
result = x.toBoolean() == y.toBoolean()
case valueObject:
result = x._object() == y._object()
default:
panic(hereBeDragons())
}
return result
}