Пример #1
0
func (u *unaryCall) Eval(context value.Context) value.Value {
	arg := u.arg.Eval(context)
	context.Push()
	defer context.Pop()
	exec := context.(*execContext) // Sigh.
	fn := exec.unaryFn[u.name]
	if fn == nil || fn.body == nil {
		value.Errorf("unary %q undefined", u.name)
	}
	context.AssignLocal(fn.right.name, arg)
	var v value.Value
	for _, e := range fn.body {
		v = e.Eval(context)
	}
	if v == nil {
		value.Errorf("no value returned by %q", u.name)
	}
	return v
}
Пример #2
0
func (b *binaryCall) Eval(context value.Context) value.Value {
	left := b.left.Eval(context)
	right := b.right.Eval(context)
	context.Push()
	defer context.Pop()
	exec := context.(*execContext) // Sigh.
	fn := exec.binaryFn[b.name]
	if fn == nil || fn.body == nil {
		value.Errorf("binary %q undefined", b.name)
	}
	context.AssignLocal(fn.left.name, left)
	context.AssignLocal(fn.right.name, right)
	var v value.Value
	for _, e := range fn.body {
		v = e.Eval(context)
	}
	if v == nil {
		value.Errorf("no value returned by %q", b.name)
	}
	return v
}