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
}
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
}