Move transitiveClosure into :commonizer-api

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/sources/DefaultKotlinSourceSet.kt

@@ -11,6 +11,7 @@ import org.gradle.api.Project
 import org.gradle.api.file.SourceDirectorySet
 import org.gradle.util.ConfigureUtil
 import org.jetbrains.kotlin.build.DEFAULT_KOTLIN_SOURCE_FILES_EXTENSIONS
+import org.jetbrains.kotlin.commonizer.util.transitiveClosure
 import org.jetbrains.kotlin.gradle.dsl.KotlinMultiplatformExtension
 import org.jetbrains.kotlin.gradle.plugin.KotlinDependencyHandler
 import org.jetbrains.kotlin.gradle.plugin.KotlinSourceSet
@@ -246,7 +247,7 @@ internal operator fun KotlinSourceSet.plus(sourceSets: Set<KotlinSourceSet>): Se
 }
 
 internal fun KotlinSourceSet.resolveAllDependsOnSourceSets(): Set<KotlinSourceSet> {
-    return transitiveClosure { dependsOn }
+    return transitiveClosure(this) { dependsOn }
 }
 
 internal fun Iterable<KotlinSourceSet>.resolveAllDependsOnSourceSets(): Set<KotlinSourceSet> {
@@ -254,5 +255,5 @@ internal fun Iterable<KotlinSourceSet>.resolveAllDependsOnSourceSets(): Set<Kotl
 }
 
 internal fun KotlinMultiplatformExtension.resolveAllSourceSetsDependingOn(sourceSet: KotlinSourceSet): Set<KotlinSourceSet> {
-    return sourceSet.transitiveClosure { sourceSets.filter { otherSourceSet -> this in otherSourceSet.dependsOn } }
+    return transitiveClosure(sourceSet) { sourceSets.filter { otherSourceSet -> this in otherSourceSet.dependsOn } }
 }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/native/internal/CInteropCommonizerTask.kt

@@ -24,7 +24,7 @@ import org.jetbrains.kotlin.gradle.plugin.mpp.kotlinSourceSetsIncludingDefault
 import org.jetbrains.kotlin.gradle.plugin.sources.resolveAllDependsOnSourceSets
 import org.jetbrains.kotlin.gradle.targets.native.internal.CInteropCommonizerTask.CInteropGist
 import org.jetbrains.kotlin.gradle.tasks.CInteropProcess
-import org.jetbrains.kotlin.gradle.utils.transitiveClosure
+import org.jetbrains.kotlin.commonizer.util.transitiveClosure
 import org.jetbrains.kotlin.gradle.utils.fileProvider
 import org.jetbrains.kotlin.konan.target.KonanTarget
 import java.io.File
@@ -211,7 +211,7 @@ private operator fun CommonizerTarget.contains(other: CommonizerTarget): Boolean
 }
 
 private fun SharedCommonizerTarget.withAllTransitiveTargets(): Set<CommonizerTarget> {
-    return setOf(this) + this.transitiveClosure<CommonizerTarget> { if (this is SharedCommonizerTarget) this.targets else emptySet() }
+    return setOf(this) + transitiveClosure<CommonizerTarget>(this) { if (this is SharedCommonizerTarget) this.targets else emptySet() }
 }
 
 private fun Project.getDependingNativeCompilations(compilation: KotlinSharedNativeCompilation): Set<KotlinNativeCompilation> {

native/commonizer-api/src/org/jetbrains/kotlin/commonizer/util/transitiveClosure.kt

@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-package org.jetbrains.kotlin.gradle.utils
+package org.jetbrains.kotlin.commonizer.util
 
 /**
  * General purpose implementation of a transitive closure
@@ -13,9 +13,9 @@ package org.jetbrains.kotlin.gradle.utils
  * @param edges: Producer function from one node to all its children. This implementation can handle loops and self references gracefully.
  * @return Note: No guarantees given about the order ot this [Set]
  */
-internal inline fun <reified T> T.transitiveClosure(edges: T.() -> Iterable<T>): Set<T> {
+public inline fun <reified T> transitiveClosure(seed: T, edges: T.() -> Iterable<T>): Set<T> {
     // Fast path when initial edges are empty
-    val initialEdges = edges()
+    val initialEdges = seed.edges()
     if (initialEdges is Collection && initialEdges.isEmpty()) return emptySet()
 
     val queue = deque<T>()
@@ -24,7 +24,7 @@ internal inline fun <reified T> T.transitiveClosure(edges: T.() -> Iterable<T>):
     while (queue.isNotEmpty()) {
         // ArrayDeque implementation will optimize this call to 'removeFirst'
         val resolved = queue.removeAt(0)
-        if (resolved != this && results.add(resolved)) {
+        if (resolved != seed && results.add(resolved)) {
             queue.addAll(resolved.edges())
         }
     }
@@ -33,7 +33,8 @@ internal inline fun <reified T> T.transitiveClosure(edges: T.() -> Iterable<T>):
 }
 
 @OptIn(ExperimentalStdlibApi::class)
-private inline fun <reified T> deque(): MutableList<T> {
+@PublishedApi
+internal inline fun <reified T> deque(): MutableList<T> {
     return if (KotlinVersion.CURRENT.isAtLeast(1, 4)) ArrayDeque()
     else mutableListOf()
 }

native/commonizer-api/test/org/jetbrains/kotlin/commonizer/TransitiveClosureTest.kt

@@ -3,7 +3,7 @@
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
-package org.jetbrains.kotlin.gradle.utils
+package org.jetbrains.kotlin.commonizer
 
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -25,7 +25,7 @@ class TransitiveClosureTest {
         }
     }
 
-    private fun Node.transitiveClosure() = transitiveClosure { children }
+    private fun Node.transitiveClosure() = org.jetbrains.kotlin.commonizer.util.transitiveClosure(this) { children }
 
     @Test
     fun `transitiveClosure does not include root node`() {