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arraySeq.scala
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arraySeq.scala
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/*
* Copyright (c) 2015 Typelevel
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package cats
package instances
import cats.data.{Chain, Ior}
import scala.annotation.tailrec
import scala.collection.immutable.ArraySeq
import scala.collection.mutable.Builder
trait ArraySeqInstances extends cats.kernel.instances.ArraySeqInstances {
implicit def catsStdInstancesForArraySeq
: Traverse[ArraySeq] with Monad[ArraySeq] with Alternative[ArraySeq] with CoflatMap[ArraySeq] with Align[ArraySeq] =
ArraySeqInstances.stdInstances
implicit def catsStdTraverseFilterForArraySeq: TraverseFilter[ArraySeq] =
ArraySeqInstances.stdTraverseFilterInstance
implicit def catsStdShowForArraySeq[A](implicit ev: Show[A]): Show[ArraySeq[A]] =
_.iterator.map(ev.show).mkString("ArraySeq(", ", ", ")")
}
private[cats] object ArraySeqInstances {
final private val stdInstances
: Traverse[ArraySeq] with Monad[ArraySeq] with Alternative[ArraySeq] with CoflatMap[ArraySeq] with Align[ArraySeq] =
new Traverse[ArraySeq]
with Monad[ArraySeq]
with Alternative[ArraySeq]
with CoflatMap[ArraySeq]
with Align[ArraySeq] {
def empty[A]: ArraySeq[A] =
ArraySeq.untagged.empty
def combineK[A](xs: ArraySeq[A], ys: ArraySeq[A]): ArraySeq[A] =
xs.concat(ys)
override def fromIterableOnce[A](as: IterableOnce[A]): ArraySeq[A] = ArraySeq.untagged.from(as)
override def prependK[A](a: A, fa: ArraySeq[A]): ArraySeq[A] = fa.prepended(a)
override def appendK[A](fa: ArraySeq[A], a: A): ArraySeq[A] = fa.appended(a)
override def algebra[A]: Monoid[ArraySeq[A]] =
new cats.kernel.instances.ArraySeqInstances.ArraySeqMonoid
def pure[A](a: A): ArraySeq[A] =
ArraySeq.untagged.fill(n = 1)(elem = a)
override def map[A, B](fa: ArraySeq[A])(f: A => B): ArraySeq[B] =
fa.map(f)
def flatMap[A, B](fa: ArraySeq[A])(f: A => ArraySeq[B]): ArraySeq[B] =
fa.flatMap(f)
def coflatMap[A, B](fa: ArraySeq[A])(f: ArraySeq[A] => B): ArraySeq[B] = {
@tailrec def loop(builder: Builder[B, ArraySeq[B]], as: ArraySeq[A]): ArraySeq[B] =
as match {
case _ +: rest => loop(builder += f(as), rest)
case _ => builder.result()
}
loop(ArraySeq.untagged.newBuilder[B], fa)
}
override def map2[A, B, Z](fa: ArraySeq[A], fb: ArraySeq[B])(f: (A, B) => Z): ArraySeq[Z] =
if (fb.isEmpty) ArraySeq.untagged.empty // do O(1) work if fb is empty
else fa.flatMap(a => fb.map(b => f(a, b))) // already O(1) if fa is empty
override def map2Eval[A, B, Z](fa: ArraySeq[A], fb: Eval[ArraySeq[B]])(f: (A, B) => Z): Eval[ArraySeq[Z]] =
if (fa.isEmpty) Eval.now(ArraySeq.untagged.empty) // no need to evaluate fb
else fb.map(fb => map2(fa, fb)(f))
def foldLeft[A, B](fa: ArraySeq[A], b: B)(f: (B, A) => B): B =
fa.foldLeft(b)(f)
def foldRight[A, B](fa: ArraySeq[A], lb: Eval[B])(f: (A, Eval[B]) => Eval[B]): Eval[B] = {
def loop(i: Int): Eval[B] =
if (i < fa.length) f(fa(i), Eval.defer(loop(i + 1))) else lb
Eval.defer(loop(0))
}
override def foldMap[A, B](fa: ArraySeq[A])(f: A => B)(implicit B: Monoid[B]): B =
B.combineAll(fa.iterator.map(f))
def traverse[G[_], A, B](fa: ArraySeq[A])(f: A => G[B])(implicit G: Applicative[G]): G[ArraySeq[B]] =
G match {
case x: StackSafeMonad[G] =>
x.map(Traverse.traverseDirectly(fa.iterator)(f)(x))(_.to(ArraySeq.untagged))
case _ =>
G.map(Chain.traverseViaChain(fa)(f))(_.iterator.to(ArraySeq.untagged))
}
override def traverse_[G[_], A, B](fa: ArraySeq[A])(f: A => G[B])(implicit G: Applicative[G]): G[Unit] =
G match {
case x: StackSafeMonad[G] => Traverse.traverse_Directly(fa)(f)(x)
case _ =>
foldRight(fa, Always(G.pure(()))) { (a, acc) =>
G.map2Eval(f(a), acc) { (_, _) =>
()
}
}.value
}
override def mapAccumulate[S, A, B](init: S, fa: ArraySeq[A])(f: (S, A) => (S, B)): (S, ArraySeq[B]) =
StaticMethods.mapAccumulateFromStrictFunctor(init, fa, f)(this)
override def mapWithIndex[A, B](fa: ArraySeq[A])(f: (A, Int) => B): ArraySeq[B] =
ArraySeq.untagged.tabulate(n = fa.length) { i =>
f(fa(i), i)
}
override def zipWithIndex[A](fa: ArraySeq[A]): ArraySeq[(A, Int)] =
fa.zipWithIndex
def tailRecM[A, B](a: A)(fn: A => ArraySeq[Either[A, B]]): ArraySeq[B] = {
val buf = ArraySeq.untagged.newBuilder[B]
@tailrec
def loop(state: List[Iterator[Either[A, B]]]): Unit =
state match {
case h :: tail if h.isEmpty =>
loop(state = tail)
case h :: tail =>
h.next() match {
case Right(b) =>
buf += b
loop(state)
case Left(a) =>
loop(state = fn(a).iterator :: h :: tail)
}
case Nil => ()
}
loop(state = fn(a).iterator :: Nil)
buf.result()
}
override def exists[A](fa: ArraySeq[A])(p: A => Boolean): Boolean =
fa.exists(p)
override def forall[A](fa: ArraySeq[A])(p: A => Boolean): Boolean =
fa.forall(p)
override def get[A](fa: ArraySeq[A])(idx: Long): Option[A] =
if (idx >= 0 && idx < fa.length && idx.isValidInt) Some(fa(idx.toInt)) else None
override def isEmpty[A](fa: ArraySeq[A]): Boolean =
fa.isEmpty
override def foldM[G[_], A, B](fa: ArraySeq[A], z: B)(f: (B, A) => G[B])(implicit G: Monad[G]): G[B] =
G.tailRecM((z, 0)) { case (b, i) =>
if (i < fa.length) G.map(f(b, fa(i)))(b => Left((b, i + 1)))
else G.pure(Right(b))
}
override def fold[A](fa: ArraySeq[A])(implicit A: Monoid[A]): A =
A.combineAll(fa)
override def toList[A](fa: ArraySeq[A]): List[A] =
fa.toList
override def toIterable[A](fa: ArraySeq[A]): Iterable[A] =
fa
override def reduceLeftOption[A](fa: ArraySeq[A])(f: (A, A) => A): Option[A] =
fa.reduceLeftOption(f)
override def find[A](fa: ArraySeq[A])(f: A => Boolean): Option[A] =
fa.find(f)
override def collectFirst[A, B](fa: ArraySeq[A])(pf: PartialFunction[A, B]): Option[B] =
fa.collectFirst(pf)
override def collectFirstSome[A, B](fa: ArraySeq[A])(f: A => Option[B]): Option[B] =
fa.collectFirst(Function.unlift(f))
def functor: Functor[ArraySeq] = this
def align[A, B](fa: ArraySeq[A], fb: ArraySeq[B]): ArraySeq[Ior[A, B]] = {
val aLarger = fa.size >= fb.size
if (aLarger) {
fa.lazyZip(fb).map(Ior.both) ++ fa.drop(fb.size).map(Ior.left)
} else {
fa.lazyZip(fb).map(Ior.both) ++ fb.drop(fa.size).map(Ior.right)
}
}
}
final private val stdTraverseFilterInstance: TraverseFilter[ArraySeq] =
new TraverseFilter[ArraySeq] {
val traverse: Traverse[ArraySeq] = stdInstances
override def mapFilter[A, B](fa: ArraySeq[A])(f: (A) => Option[B]): ArraySeq[B] =
fa.collect(Function.unlift(f))
override def filter[A](fa: ArraySeq[A])(f: (A) => Boolean): ArraySeq[A] =
fa.filter(f)
override def filterNot[A](fa: ArraySeq[A])(f: (A) => Boolean): ArraySeq[A] =
fa.filterNot(f)
override def collect[A, B](fa: ArraySeq[A])(f: PartialFunction[A, B]): ArraySeq[B] =
fa.collect(f)
override def flattenOption[A](fa: ArraySeq[Option[A]]): ArraySeq[A] =
fa.flatten
def traverseFilter[G[_], A, B](
fa: ArraySeq[A]
)(f: (A) => G[Option[B]])(implicit G: Applicative[G]): G[ArraySeq[B]] =
G match {
case x: StackSafeMonad[G] =>
x.map(TraverseFilter.traverseFilterDirectly(fa.iterator)(f)(x))(
_.to(ArraySeq.untagged)
)
case _ =>
fa.foldRight(Eval.now(G.pure(ArraySeq.untagged.empty[B]))) { case (x, xse) =>
G.map2Eval(f(x), xse)((i, o) => i.fold(o)(_ +: o))
}.value
}
override def filterA[G[_], A](fa: ArraySeq[A])(f: (A) => G[Boolean])(implicit G: Applicative[G]): G[ArraySeq[A]] =
fa.foldRight(Eval.now(G.pure(ArraySeq.untagged.empty[A]))) { case (x, xse) =>
G.map2Eval(f(x), xse)((b, vec) => if (b) x +: vec else vec)
}.value
}
}