[AA] KT-58257 Implement KtStaticModuleDependentsProvider (standalone)

analysis/project-structure/src/org/jetbrains/kotlin/analysis/project/structure/impl/KotlinModuleDependentsProviderBase.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2010-2023 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * 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.analysis.project.structure.impl
+
+import org.jetbrains.kotlin.analysis.project.structure.KotlinModuleDependentsProvider
+import org.jetbrains.kotlin.analysis.project.structure.KtModule
+
+public abstract class KotlinModuleDependentsProviderBase : KotlinModuleDependentsProvider() {
+    override fun getTransitiveDependents(module: KtModule): Set<KtModule> = computeTransitiveDependents(module)
+
+    protected fun computeTransitiveDependents(module: KtModule): Set<KtModule> = buildSet {
+        // We could use `DFS` from utils, but this implementation has no handler overhead and is simple enough.
+        fun visit(module: KtModule) {
+            if (module in this) return
+            add(module)
+            getDirectDependents(module).forEach(::visit)
+        }
+        visit(module)
+
+        // `module` should not be part of its own dependents, per the contract of `KotlinModuleDependentsProvider`.
+        remove(module)
+    }
+}