Method Exec

interpreter/interpretable.go:568–586

Exec implements the InterpretableV2 interface method.

(frame *ExecutionFrame)

// Exec implements the InterpretableV2 interface method.
func (un *evalUnary) Exec(frame *ExecutionFrame) ref.Val {
	argVal := un.arg.Exec(frame)
	// Early return if the argument to the function is unknown or error.
	strict := !un.nonStrict
	if strict && types.IsUnknownOrError(argVal) {
		return argVal
	}
	// If the implementation is bound and the argument value has the right traits required to
	// invoke it, then call the implementation.
	if un.impl != nil && (un.trait == 0 || (!strict && types.IsUnknownOrError(argVal)) || argVal.Type().HasTrait(un.trait)) {
		return types.LabelErrNode(un.id, un.impl(argVal))
	}
	// Otherwise, if the argument is a ReceiverType attempt to invoke the receiver method on the
	// operand (arg0).
	if argVal.Type().HasTrait(traits.ReceiverType) {
		return types.LabelErrNode(un.id, argVal.(traits.Receiver).Receive(un.function, un.overload, []ref.Val{}))
	}
	return types.NewErrWithNodeID(un.id, "no such overload: %s", un.function)
}

// Eval implements the Interpretable interface method.
func (un *evalUnary) Eval(ctx Activation) ref.Val {