Feature request: lazy labels #969
Description
Evaluating labels, if they contain formatted input data, can be somewhat expensive. I'd love to see sibling methods, which take a => String argument. I solved it with a very ugly - but working - hack, but it would be great to see it integrated propely.
private class LazySet[T](lzy : => Set[T]) extends AbstractSet[T] {
private lazy val evaluated = lzy
override def contains(elem :T) :Boolean = evaluated.contains(elem)
override def incl(elem :T) :Set[T] = new LazySet(evaluated + elem)
override def excl(elem :T) :Set[T] = new LazySet(evaluated - elem)
override def iterator :Iterator[T] = evaluated.iterator
override def empty = new LazySet[T](Set.empty[T])
}
implicit class PropExtension(private val self :Prop) extends AnyVal {
def lbl(l : => String) :Prop = self.map { res =>
res.copy(labels = new LazySet(res.labels + l))
}
@inline def lbl_:(l: => String) :Prop = lbl(l)
def orElse(p : => Prop) =
self.combine(Prop.secure(p)) { (first, second) =>
if (first.failure && second.status.isInstanceOf[Prop.Exception])
err.println(first.toString + " orElse " + second)
if (first.success) first
else second
}
}
implicit class BooleanExtension(private val self :Boolean) extends AnyVal {
private def prop = Prop(self)
def lbl(l : => String) :Prop = prop.map { res =>
res.copy(labels = new LazySet(res.labels + l))
}
@inline def lbl_:(l : => String) :Prop = lbl(l)
def orElse(p : => Prop) =
prop.combine(Prop.secure(p)) { (first, second) =>
if (first.failure && second.status.isInstanceOf[Prop.Exception])
err.println(first.toString + " orElse " + second)
if (first.success) first
else second
}
}