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author | Jason Zaugg <jzaugg@gmail.com> | 2013-11-25 09:23:06 +0100 |
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committer | Jason Zaugg <jzaugg@gmail.com> | 2013-11-26 15:01:11 +0100 |
commit | f12bb7bda4cd1e145ab5731ae6728f9e8dd2e54c (patch) | |
tree | ee95e631c21aebd0a9eafc6ceb9695808fea1cc3 /test/files/pos/t5406.scala | |
parent | 744425aab4f67805996388ea8620e81d1e4224b0 (diff) | |
download | scala-f12bb7bda4cd1e145ab5731ae6728f9e8dd2e54c.tar.gz scala-f12bb7bda4cd1e145ab5731ae6728f9e8dd2e54c.tar.bz2 scala-f12bb7bda4cd1e145ab5731ae6728f9e8dd2e54c.zip |
SI-4332 Plugs the gaps in views
These currently result in runtime errors:
scala> List(1).view.distinct.force
java.lang.UnsupportedOperationException: SeqView(...).newBuilder
scala> List(1).view.inits.toList
java.lang.UnsupportedOperationException: SeqView(...).newBuilder
Two tests are enclosed:
1. reflect on the views to make any method that returns
`Repr` is overriden in `*ViewLike`. This guards against
new additions to the collections API.
2. exercise the newly added overrides
Some care is needed with `tail`, we must re-override it
in `mutable.IndexedSeqView` to be explicit about the
end point of the slice, because the `IndexedSeqView#Sliced`
defines length in terms of that. (Higher up the chain, it
is just `iterator.size`, that's why `SeqView#tail` just sets
up a slice from `1 to Int.MaxValue`.)
Parallel collections views are not touched, as these are likely
to be deprecated or removed shortly.
Before this change, the test reported the following.
Not all of these methods were buggy. For instance, `sortBy`,
`sortWith` are implemented in terms of `sorted` which
was implemented in `SeqViewLike`. Even in those cases, I have
opted to override the methods in the `ViewLike` to guard
against changes in the base class implementation and to
simplify the rules in the test.
======================================================================
Checking scala.collection.TraversableView
======================================================================
trait TraversableLike
----------------------------------------------------------------------
def filterNot(p: A => Boolean): Repr
def inits: Iterator[Repr]
def tails: Iterator[Repr]
override def tail: Repr
======================================================================
Checking scala.collection.IterableView
======================================================================
trait IterableLike
----------------------------------------------------------------------
def dropRight(n: Int): Repr
def sliding(size: Int): Iterator[Repr]
def takeRight(n: Int): Repr
trait TraversableLike
----------------------------------------------------------------------
def filterNot(p: A => Boolean): Repr
def inits: Iterator[Repr]
def tails: Iterator[Repr]
override def tail: Repr
======================================================================
Checking scala.collection.SeqView
======================================================================
trait IterableLike
----------------------------------------------------------------------
def dropRight(n: Int): Repr
def sliding(size: Int): Iterator[Repr]
def takeRight(n: Int): Repr
trait SeqLike
----------------------------------------------------------------------
def combinations(n: Int): Iterator[Repr]
def distinct: Repr
def permutations: Iterator[Repr]
def sortBy[B](f: A => B)(implicit ord: scala.math.Ordering[B]): Repr
def sortWith(lt: (A, A) => Boolean): Repr
trait TraversableLike
----------------------------------------------------------------------
def filterNot(p: A => Boolean): Repr
def inits: Iterator[Repr]
def tails: Iterator[Repr]
override def tail: Repr
======================================================================
Checking scala.collection.mutable.IndexedSeqView
======================================================================
trait IndexedSeqOptimized
----------------------------------------------------------------------
override def dropRight(n: Int): Repr
override def tail: Repr
override def takeRight(n: Int): Repr
trait IterableLike
----------------------------------------------------------------------
def sliding(size: Int): Iterator[Repr]
trait SeqLike
----------------------------------------------------------------------
def combinations(n: Int): Iterator[Repr]
def distinct: Repr
def permutations: Iterator[Repr]
def sortBy[B](f: A => B)(implicit ord: scala.math.Ordering[B]): Repr
def sortWith(lt: (A, A) => Boolean): Repr
trait TraversableLike
----------------------------------------------------------------------
def filterNot(p: A => Boolean): Repr
def inits: Iterator[Repr]
def tails: Iterator[Repr]
======================================================================
Checking scala.collection.immutable.StreamView
======================================================================
trait IterableLike
----------------------------------------------------------------------
def dropRight(n: Int): Repr
def sliding(size: Int): Iterator[Repr]
def takeRight(n: Int): Repr
trait SeqLike
----------------------------------------------------------------------
def combinations(n: Int): Iterator[Repr]
def distinct: Repr
def permutations: Iterator[Repr]
def sortBy[B](f: A => B)(implicit ord: scala.math.Ordering[B]): Repr
def sortWith(lt: (A, A) => Boolean): Repr
trait TraversableLike
----------------------------------------------------------------------
def filterNot(p: A => Boolean): Repr
def inits: Iterator[Repr]
def tails: Iterator[Repr]
override def tail: Repr
Diffstat (limited to 'test/files/pos/t5406.scala')
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