Method defineArrayLength

array.go:381–420

(prop *valueProperty, descr PropertyDescriptor, setter func(uint32, bool) bool, throw bool)

}

func (r *Runtime) defineArrayLength(prop *valueProperty, descr PropertyDescriptor, setter func(uint32, bool) bool, throw bool) bool {
	var newLen uint32
	ret := true
	if descr.Value != nil {
		newLen = r.toLengthUint32(descr.Value)
	}

	if descr.Configurable == FLAG_TRUE || descr.Enumerable == FLAG_TRUE || descr.Getter != nil || descr.Setter != nil {
		ret = false
		goto Reject
	}

	if descr.Value != nil {
		oldLen := uint32(prop.value.ToInteger())
		if oldLen != newLen {
			ret = setter(newLen, false)
		}
	} else {
		ret = true
	}

	if descr.Writable != FLAG_NOT_SET {
		w := descr.Writable.Bool()
		if prop.writable {
			prop.writable = w
		} else {
			if w {
				ret = false
				goto Reject
			}
		}
	}

Reject:
	if !ret {
		r.typeErrorResult(throw, "Cannot redefine property: length")
	}

	return ret
}

func (a *arrayObject) _defineIdxProperty(idx uint32, desc PropertyDescriptor, throw bool) bool {
	var existing Value