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Add reverse method to NonEmptyTuple #13752

Merged
merged 9 commits into from
Jul 3, 2023
Merged

Add reverse method to NonEmptyTuple #13752

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d8dfef6
Add reverse method to NonEmptyTuple
danicheg Oct 15, 2021
ebd5f2b
Merge branch 'master' into tuple-reverse
danicheg Oct 22, 2021
ab1a19f
Update MiMa filters
danicheg Oct 22, 2021
ebf8d8c
Merge branch main
danicheg May 14, 2023
a1d8b66
Address review comments
danicheg May 14, 2023
5006b2f
Remove wrong branch in Tuples#xxlReverse
danicheg May 17, 2023
cb2f91f
Merge branch 'main' into tuple-reverse
danicheg Jul 2, 2023
6aef25a
Move reverse method to Tuple
danicheg Jul 2, 2023
ae14dab
Add one more test
danicheg Jul 2, 2023
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21 changes: 20 additions & 1 deletion library/src/scala/Tuple.scala
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
package scala

import annotation.showAsInfix
import annotation.{experimental, showAsInfix}
import compiletime._
import compiletime.ops.int._

Expand Down Expand Up @@ -193,6 +193,19 @@ object Tuple {
*/
type IsMappedBy[F[_]] = [X <: Tuple] =>> X =:= Map[InverseMap[X, F], F]

/** Type of the reversed tuple */
@experimental
type Reverse[X <: Tuple] = Helpers.ReverseImpl[EmptyTuple, X]

@experimental
object Helpers:

/** Type of the reversed tuple */
@experimental
type ReverseImpl[Acc <: Tuple, X <: Tuple] <: Tuple = X match
case x *: xs => ReverseImpl[x *: Acc, xs]
case EmptyTuple => Acc

/** Transforms a tuple `(T1, ..., Tn)` into `(T1, ..., Ti)`. */
type Take[T <: Tuple, N <: Int] <: Tuple = N match {
case 0 => EmptyTuple
Expand Down Expand Up @@ -298,6 +311,12 @@ sealed trait NonEmptyTuple extends Tuple {
inline def tail[This >: this.type <: NonEmptyTuple]: Tail[This] =
runtime.Tuples.tail(this).asInstanceOf[Tail[This]]

/** Given a tuple `(a1, ..., am)`, returns the reversed tuple `(am, ..., a1)`
* consisting all its elements.
*/
@experimental
inline def reverse[This >: this.type <: Tuple]: Reverse[This] =
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This method should also be moved to the Tuple trait, currently it is in NonEmptyTuple

runtime.Tuples.reverse(this).asInstanceOf[Reverse[This]]
}

@showAsInfix
Expand Down
75 changes: 75 additions & 0 deletions library/src/scala/runtime/Tuples.scala
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Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
package scala.runtime

import scala.annotation.experimental

object Tuples {

inline val MaxSpecialized = 22
Expand Down Expand Up @@ -447,6 +449,79 @@ object Tuples {
}
}

// Reverse for TupleXXL
private def xxlReverse(xxl: TupleXXL): Tuple = {
if (xxl.productArity == 22) {
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this branch should be removed - TupleXXL should not be constructed unless its arity is 23+

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Yeah, indeed. Good call, thanks

val elems = xxl.elems
Tuple22(
elems(21), elems(20), elems(19), elems(18), elems(17), elems(16),
elems(15), elems(14), elems(13), elems(12), elems(11), elems(10),
elems(9), elems(8), elems(7), elems(6), elems(5), elems(4),
elems(3), elems(2), elems(1), elems(0)
)
} else {
TupleXXL.fromIArray(xxl.elems.reverse.asInstanceOf[IArray[Object]]).asInstanceOf[Tuple]
}
}

// Reverse for Tuple0 to Tuple22
private def specialCaseReverse(self: Tuple): Tuple = {
(self: Any) match {
case EmptyTuple =>
EmptyTuple
case self: Tuple1[_] =>
self
case self: Tuple2[_, _] =>
Tuple2(self._2, self._1)
case self: Tuple3[_, _, _] =>
Tuple3(self._3, self._2, self._1)
case self: Tuple4[_, _, _, _] =>
Tuple4(self._4, self._3, self._2, self._1)
case self: Tuple5[_, _, _, _, _] =>
Tuple5(self._5, self._4, self._3, self._2, self._1)
case self: Tuple6[_, _, _, _, _, _] =>
Tuple6(self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple7[_, _, _, _, _, _, _] =>
Tuple7(self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple8[_, _, _, _, _, _, _, _] =>
Tuple8(self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple9[_, _, _, _, _, _, _, _, _] =>
Tuple9(self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple10[_, _, _, _, _, _, _, _, _, _] =>
Tuple10(self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple11[_, _, _, _, _, _, _, _, _, _, _] =>
Tuple11(self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple12[_, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple12(self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple13[_, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple13(self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple14[_, _, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple14(self._14, self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple15[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple15(self._15, self._14, self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple16[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple16(self._16, self._15, self._14, self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple17[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple17(self._17, self._16, self._15, self._14, self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple18[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple18(self._18, self._17, self._16, self._15, self._14, self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple19[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple19(self._19, self._18, self._17, self._16, self._15, self._14, self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple20[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple20(self._20, self._19, self._18, self._17, self._16, self._15, self._14, self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple21[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple21(self._21, self._20, self._19, self._18, self._17, self._16, self._15, self._14, self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
case self: Tuple22[_, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _, _] =>
Tuple22(self._22, self._21, self._20, self._19, self._18, self._17, self._16, self._15, self._14, self._13, self._12, self._11, self._10, self._9, self._8, self._7, self._6, self._5, self._4, self._3, self._2, self._1)
}
}

@experimental
def reverse(self: Tuple): Tuple = (self: Any) match {
case xxl: TupleXXL => xxlReverse(xxl)
case _ => specialCaseReverse(self)
}

// Init for Tuple1 to Tuple22
private def specialCaseInit(self: Tuple): Tuple = {
(self: Any) match {
Expand Down
2 changes: 2 additions & 0 deletions project/MiMaFilters.scala
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Expand Up @@ -31,6 +31,8 @@ object MiMaFilters {
ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$experimental$into$"),
ProblemFilters.exclude[MissingFieldProblem]("scala.runtime.stdLibPatches.language#experimental.relaxedExtensionImports"),
ProblemFilters.exclude[MissingClassProblem]("scala.runtime.stdLibPatches.language$experimental$relaxedExtensionImports$"),
ProblemFilters.exclude[DirectMissingMethodProblem]("scala.runtime.Tuples.reverse"),
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Suggested change
ProblemFilters.exclude[DirectMissingMethodProblem]("scala.runtime.Tuples.reverse"),

ProblemFilters.exclude[MissingFieldProblem]("scala.Tuple.Helpers"),
// end of New experimental features in 3.3.X

// Added java.io.Serializable as LazyValControlState supertype
Expand Down
10 changes: 9 additions & 1 deletion tests/run-custom-args/tasty-inspector/stdlibExperimentalDefinitions.scala
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Expand Up @@ -92,7 +92,15 @@ val experimentalDefinitionInLibrary = Set(
"scala.quoted.Quotes.reflectModule.MethodTypeMethods.hasErasedParams",
"scala.quoted.Quotes.reflectModule.TermParamClauseMethods.erasedArgs",
"scala.quoted.Quotes.reflectModule.TermParamClauseMethods.hasErasedArgs",
"scala.quoted.Quotes.reflectModule.defnModule.ErasedFunctionClass"
"scala.quoted.Quotes.reflectModule.defnModule.ErasedFunctionClass",

// New feature: reverse method on Tuple
"scala.NonEmptyTuple.reverse",
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this will be affected when you move reverse to Tuple

"scala.Tuple$.Helpers",
"scala.Tuple$.Helpers$",
"scala.Tuple$.Helpers$.ReverseImpl",
"scala.Tuple$.Reverse",
"scala.runtime.Tuples$.reverse"
)


Expand Down
76 changes: 76 additions & 0 deletions tests/run-deep-subtype/Tuple-reverse.check
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Original file line number Diff line number Diff line change
@@ -0,0 +1,76 @@
(0)
(0,0)
(1,0,0)
(2,1,0,0)
(3,2,1,0,0)
(4,3,2,1,0,0)
(5,4,3,2,1,0,0)
(6,5,4,3,2,1,0,0)
(7,6,5,4,3,2,1,0,0)
(8,7,6,5,4,3,2,1,0,0)
(9,8,7,6,5,4,3,2,1,0,0)
(10,9,8,7,6,5,4,3,2,1,0,0)
(11,10,9,8,7,6,5,4,3,2,1,0,0)
(12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1,0,0)
(1)
(2,1)
(3,2,1)
(4,3,2,1)
(5,4,3,2,1)
(6,5,4,3,2,1)
(7,6,5,4,3,2,1)
(8,7,6,5,4,3,2,1)
(9,8,7,6,5,4,3,2,1)
(10,9,8,7,6,5,4,3,2,1)
(11,10,9,8,7,6,5,4,3,2,1)
(12,11,10,9,8,7,6,5,4,3,2,1)
(13,12,11,10,9,8,7,6,5,4,3,2,1)
(14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(1)
(2,1)
(3,2,1)
(4,3,2,1)
(5,4,3,2,1)
(6,5,4,3,2,1)
(7,6,5,4,3,2,1)
(8,7,6,5,4,3,2,1)
(9,8,7,6,5,4,3,2,1)
(10,9,8,7,6,5,4,3,2,1)
(11,10,9,8,7,6,5,4,3,2,1)
(12,11,10,9,8,7,6,5,4,3,2,1)
(13,12,11,10,9,8,7,6,5,4,3,2,1)
(14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
(25,24,23,22,21,20,19,18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1)
66 changes: 66 additions & 0 deletions tests/run-deep-subtype/Tuple-reverse.scala
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@@ -0,0 +1,66 @@
import scala.reflect.ClassTag

object Test {
def main(args: Array[String]): Unit = {

def testArray[T: ClassTag](n: Int, elem: Int => T): Unit = {
val t: Int *: Tuple = 0 *: Tuple.fromArray(Array.tabulate(n)(elem))
println(t.reverse)
}

for (i <- 0 to 25)
testArray(i, j => j)

println(Tuple1(1).reverse)
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println((1, 2).reverse)
println((1, 2, 3).reverse)
println((1, 2, 3, 4).reverse)
println((1, 2, 3, 4, 5).reverse)
println((1, 2, 3, 4, 5, 6).reverse)
println((1, 2, 3, 4, 5, 6, 7).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24).reverse)
println((1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25).reverse)

println((1 *: Tuple()).reverse)
println((1 *: 2 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: 17 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: 17 *: 18 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: 17 *: 18 *: 19 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: 17 *: 18 *: 19 *: 20 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: 17 *: 18 *: 19 *: 20 *: 21 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: 17 *: 18 *: 19 *: 20 *: 21 *: 22 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: 17 *: 18 *: 19 *: 20 *: 21 *: 22 *: 23 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: 17 *: 18 *: 19 *: 20 *: 21 *: 22 *: 23 *: 24 *: Tuple()).reverse)
println((1 *: 2 *: 3 *: 4 *: 5 *: 6 *: 7 *: 8 *: 9 *: 10 *: 11 *: 12 *: 13 *: 14 *: 15 *: 16 *: 17 *: 18 *: 19 *: 20 *: 21 *: 22 *: 23 *: 24 *: 25 *: Tuple()).reverse)
}
}