[Gradle][MPP] KotlinProjectStructureMetadata: Add .sourceSetNames property

^KT-48135 WIP

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/HierarchicalMppIT.kt

@@ -570,6 +570,7 @@ class HierarchicalMppIT : KGPBaseTest() {
             sourceSetCInteropMetadataDirectory = mapOf(),
             hostSpecificSourceSets = emptySet(),
             sourceSetBinaryLayout = sourceSetModuleDependencies.mapValues { SourceSetMetadataLayout.KLIB },
+            sourceSetNames = setOf("commonMain", "jvmAndJsMain", "linuxAndJsMain"),
             isPublishedAsRoot = true
         )
     }

libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/mpp/KotlinProjectStructureMetadata.kt

@@ -114,8 +114,11 @@ data class KotlinProjectStructureMetadata(
     @get:Input
     val isPublishedAsRoot: Boolean,
 
+    @get:Input
+    val sourceSetNames: Set<String>,
+
     @Input
-    val formatVersion: String = FORMAT_VERSION_0_3_2
+    val formatVersion: String = FORMAT_VERSION_0_3_3
 ) : Serializable {
     @Suppress("UNUSED") // Gradle input
     @get:Input
@@ -136,9 +139,13 @@ data class KotlinProjectStructureMetadata(
 
         // + 'sourceSetCInteropMetadataDirectory' map
         internal const val FORMAT_VERSION_0_3_2 = "0.3.2"
+
+        // + 'sourceSetsNames'
+        internal const val FORMAT_VERSION_0_3_3 = "0.3.3"
     }
 }
 
+
 internal val KotlinMultiplatformExtension.kotlinProjectStructureMetadata: KotlinProjectStructureMetadata
     get() = project.extensions.extraProperties.getOrPut("org.jetbrains.kotlin.gradle.plugin.mpp.kotlinProjectStructureMetadata") {
         buildKotlinProjectStructureMetadata(this)
@@ -193,7 +200,8 @@ private fun buildKotlinProjectStructureMetadata(extension: KotlinMultiplatformEx
         sourceSetBinaryLayout = sourceSetsWithMetadataCompilations.keys.associate { sourceSet ->
             sourceSet.name to SourceSetMetadataLayout.chooseForProducingProject()
         },
-        isPublishedAsRoot = true
+        isPublishedAsRoot = true,
+        sourceSetNames = sourceSetsWithMetadataCompilations.keys.map { it.name }.toSet(),
     )
 }
 
@@ -226,7 +234,8 @@ internal fun buildProjectStructureMetadata(module: GradleKpmModule): KotlinProje
         sourceSetModuleDependencies = fragmentDependencies,
         sourceSetCInteropMetadataDirectory = emptyMap(), // Not supported yet
         hostSpecificSourceSets = getHostSpecificFragments(module).mapTo(mutableSetOf()) { it.name },
-        isPublishedAsRoot = true
+        isPublishedAsRoot = true,
+        sourceSetNames = module.fragments.map { it.name }.toSet()
     )
 }
 
@@ -253,8 +262,7 @@ internal fun <Serializer> KotlinProjectStructureMetadata.serialize(
         }
 
         multiNodes(SOURCE_SETS_NODE_NAME) {
-            val keys = sourceSetsDependsOnRelation.keys + sourceSetModuleDependencies.keys
-            for (sourceSet in keys) {
+            for (sourceSet in sourceSetNames) {
                 multiNodesItem(SOURCE_SET_NODE_NAME) {
                     value(NAME_NODE_NAME, sourceSet)
                     multiValue(DEPENDS_ON_NODE_NAME, sourceSetsDependsOnRelation[sourceSet].orEmpty().toList())
@@ -304,7 +312,7 @@ internal fun KotlinProjectStructureMetadata.toJson(): String {
 
 private val NodeList.elements: Iterable<Element> get() = (0 until length).map { this@elements.item(it) }.filterIsInstance<Element>()
 
-internal fun parseKotlinSourceSetMetadataFromJson(string: String): KotlinProjectStructureMetadata? {
+internal fun parseKotlinSourceSetMetadataFromJson(string: String): KotlinProjectStructureMetadata {
     @Suppress("DEPRECATION") // The replacement doesn't compile against old dependencies such as AS 4.0
     val json = JsonParser().parse(string).asJsonObject
     val valueNamed: JsonObject.(String) -> String? = { name -> get(name)?.asString }
@@ -314,7 +322,7 @@ internal fun parseKotlinSourceSetMetadataFromJson(string: String): KotlinProject
     return parseKotlinSourceSetMetadata({ json.get(ROOT_NODE_NAME).asJsonObject }, valueNamed, multiObjects, multiValues)
 }
 
-internal fun parseKotlinSourceSetMetadataFromXml(document: Document): KotlinProjectStructureMetadata? {
+internal fun parseKotlinSourceSetMetadataFromXml(document: Document): KotlinProjectStructureMetadata {
     val nodeNamed: Element.(String) -> Element? = { name -> getElementsByTagName(name).elements.singleOrNull() }
     val valueNamed: Element.(String) -> String? =
         { name -> getElementsByTagName(name).run { if (length > 0) item(0).textContent else null } }
@@ -334,7 +342,7 @@ internal fun <ParsingContext> parseKotlinSourceSetMetadata(
     valueNamed: ParsingContext.(key: String) -> String?,
     multiObjects: ParsingContext.(named: String) -> Iterable<ParsingContext>,
     multiValues: ParsingContext.(named: String) -> Iterable<String>
-): KotlinProjectStructureMetadata? {
+): KotlinProjectStructureMetadata {
     val projectStructureNode = getRoot()
 
     val formatVersion = checkNotNull(projectStructureNode.valueNamed(FORMAT_VERSION_NODE_NAME))
@@ -355,11 +363,13 @@ internal fun <ParsingContext> parseKotlinSourceSetMetadata(
     val sourceSetBinaryLayout = mutableMapOf<String, SourceSetMetadataLayout>()
     val sourceSetCInteropMetadataDirectory = mutableMapOf<String, String>()
     val hostSpecificSourceSets = mutableSetOf<String>()
+    val sourceSetNames = mutableSetOf<String>()
 
     val sourceSetsNode = projectStructureNode.multiObjects(SOURCE_SETS_NODE_NAME)
 
     sourceSetsNode.forEach { sourceSetNode ->
         val sourceSetName = checkNotNull(sourceSetNode.valueNamed(NAME_NODE_NAME))
+        sourceSetNames.add(sourceSetName)
 
         val dependsOn = sourceSetNode.multiValues(DEPENDS_ON_NODE_NAME).toSet()
         val moduleDependencies = sourceSetNode.multiValues(MODULE_DEPENDENCY_NODE_NAME).mapTo(mutableSetOf()) {
@@ -390,6 +400,7 @@ internal fun <ParsingContext> parseKotlinSourceSetMetadata(
         sourceSetCInteropMetadataDirectory = sourceSetCInteropMetadataDirectory,
         hostSpecificSourceSets = hostSpecificSourceSets,
         isPublishedAsRoot = isPublishedAsRoot,
+        sourceSetNames = sourceSetNames,
         formatVersion = formatVersion
     )
 }

libraries/tools/kotlin-gradle-plugin/src/functionalTest/kotlin/org/jetbrains/kotlin/gradle/KotlinProjectStructureMetadataSerializationTest.kt

@@ -35,7 +35,8 @@ class KotlinProjectStructureMetadataSerializationTest {
         ),
         sourceSetCInteropMetadataDirectory = mapOf("sourceSetB" to "xx/cinterop/", "sourceSetC" to "cinterops/C"),
         hostSpecificSourceSets = setOf("sourceSetC"),
-        isPublishedAsRoot = true
+        isPublishedAsRoot = true,
+        sourceSetNames = setOf("sourceSetA", "sourceSetB", "sourceSetC"),
     )
 
     @Test
@@ -64,6 +65,10 @@ class KotlinProjectStructureMetadataSerializationTest {
         We expect no 'cinterop metadata' in artifacts with older format versions
         */
         assertEquals(emptyMap(), deserialized.sourceSetCInteropMetadataDirectory)
+        assertEquals(
+            setOf("commonMain", "concurrentMain", "nativeDarwinMain", "nativeMain", "nativeOtherMain"),
+            deserialized.sourceSetNames
+        )
     }
 
 }