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import scala.language.dynamics
object Test extends dotty.runtime.LegacyApp {
object stubUpdate {
def update(as: Any*) = println(".update"+as.toList.mkString("(",", ", ")"))
}
object stub {
def apply = {println(".apply"); stubUpdate}
def apply(as: Any*) = println(".apply"+as.toList.mkString("(",", ", ")"))
def update(as: Any*) = println(".update"+as.toList.mkString("(",", ", ")"))
}
class MyDynamic extends Dynamic {
def applyDynamic[T](n: String)(as: Any*) = {println("qual.applyDynamic("+ n +")"+ as.toList.mkString("(",", ", ")")); stub}
def applyDynamicNamed[T](n: String)(as: (String, Any)*) = {println("qual.applyDynamicNamed("+ n +")"+ as.toList.mkString("(",", ", ")")); stub}
def selectDynamic[T](n: String) = {println("qual.selectDynamic("+ n +")"); stub}
def updateDynamic(n: String)(x: Any): Unit = {println("qual.updateDynamic("+ n +")("+ x +")")}
}
val qual = new MyDynamic
val expr = "expr"
val a = "a"
val a2 = "a2"
type T = String
// If qual.sel is followed by a potential type argument list [Ts] and an argument list (arg1, …, argn) where none of the arguments argi are named:
// qual.applyDynamic(“sel”)(arg1, …, argn)
qual.sel()
qual.sel(a)
// qual.sel(a, a2: _*) -- should not accept varargs?
qual.sel(a)(a2)
qual.sel[T](a)
qual.sel[T](a)(a2)
// If qual.sel is followed by a potential type argument list [Ts]
// and a non-empty named argument list (x1 = arg1, …, xn = argn) where some name prefixes xi = might be missing:
// qual.applyDynamicNamed(“sel”)(xs1 -> arg1, …, xsn -> argn)
qual.sel(arg = a)
qual.sel[T](arg = a)
qual.sel(a, arg2 = "a2")
// qual.sel(a)(a2, arg2 = "a2")
// qual.sel[T](a)(a2, arg2 = "a2")
// qual.sel(arg = a, a2: _*)
// qual.sel(arg, arg2 = "a2", a2: _*)
// If qual.sel appears immediately on the left-hand side of an assigment
// qual.updateDynamic(“sel”)(expr)
qual.sel = expr
// If qual.sel, possibly applied to type arguments, but is
// not applied to explicit value arguments,
// nor immediately followed by an assignment operator:
// qual.selectDynamic[Ts](“sel”)
qual.sel
qual.sel[T]
qual.sel(1) = expr // parser turns this into qual.sel.update(1, expr)
qual.sel() = expr // parser turns this into qual.sel.update(expr)
qual.sel.apply(1)
qual.sel.apply(1) = 1
qual.apply(a)
qual.apply[String](a)
qual(a)
qual[String](a)
qual[T](arg = a)
qual(a, arg2 = "a2")
qual(a) = a2
}
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