Basic Swift export

Minor hack: use wasm stdlib to avoid downloading the whole K/N distribution

build.gradle.kts

@@ -40,6 +40,7 @@ allprojects {
         maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap")
         maven("https://maven.pkg.jetbrains.space/kotlin/p/wasm/experimental")
         maven("https://maven.pkg.jetbrains.space/public/p/compose/dev")
+        maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/swift-export-experimental")
     }
     afterEvaluate {
         dependencies {
@@ -74,6 +75,7 @@ dependencies {
     implementation("org.jetbrains.kotlin:core:231-$kotlinIdeVersion-$kotlinIdeVersionSuffix")
     implementation(project(":executors", configuration = "default"))
     implementation(project(":common", configuration = "default"))
+    implementation(project(":swift-export-playground", configuration = "default"))
 
     testImplementation("org.springframework.boot:spring-boot-starter-test") {
         exclude(group = "org.junit.vintage", module = "junit-vintage-engine")

gradle.properties

@@ -1,6 +1,7 @@
 systemProp.kotlinVersion=2.0.0-RC2
 systemProp.kotlinIdeVersion=1.9.20-506
 systemProp.kotlinIdeVersionSuffix=IJ8109.175
+systemProp.swiftExportVersion=2.0.20-dev-3080
 systemProp.policy=executor.policy
 systemProp.indexes=indexes.json
 systemProp.indexesJs=indexesJs.json

settings.gradle.kts

@@ -3,6 +3,7 @@ include(":executors")
 include(":indexation")
 include(":common")
 include(":dependencies")
+include(":swift-export-playground")
 
 pluginManagement {
     repositories {

src/main/kotlin/com/compiler/server/compiler/components/SwiftExportTranslator.kt

@@ -0,0 +1,32 @@
+package com.compiler.server.compiler.components
+
+import com.compiler.server.model.CompilerDiagnostics
+import com.compiler.server.model.SwiftExportResult
+import com.compiler.server.model.toExceptionDescriptor
+import component.KotlinEnvironment
+import org.jetbrains.kotlin.psi.KtFile
+import org.springframework.stereotype.Component
+import runSwiftExport
+import java.nio.file.Path
+
+@Component
+class SwiftExportTranslator(
+    private val kotlinEnvironment: KotlinEnvironment,
+) {
+    fun translate(files: List<KtFile>): SwiftExportResult = try {
+        usingTempDirectory { tempDirectory ->
+            val ioFiles = files.writeToIoFiles(tempDirectory)
+            val stdlib = kotlinEnvironment.WASM_LIBRARIES.singleOrNull { "stdlib" in it }
+            val swiftCode = runSwiftExport(
+                sourceFile = ioFiles.first(),
+                stdlibPath = stdlib?.let { Path.of(it) },
+            )
+            SwiftExportResult(
+                compilerDiagnostics = CompilerDiagnostics(emptyMap()),
+                swiftCode = swiftCode
+            )
+        }
+    } catch (e: Exception) {
+        SwiftExportResult(swiftCode = "", exception = e.toExceptionDescriptor())
+    }
+}

src/main/kotlin/com/compiler/server/controllers/CompilerRestController.kt

@@ -28,6 +28,10 @@ class CompilerRestController(private val kotlinProjectExecutor: KotlinProjectExe
       KotlinTranslatableCompiler.JS -> kotlinProjectExecutor.convertToJsIr(project)
       KotlinTranslatableCompiler.WASM -> kotlinProjectExecutor.convertToWasm(project, debugInfo)
       KotlinTranslatableCompiler.COMPOSE_WASM -> kotlinProjectExecutor.convertToWasm(project, debugInfo)
+      KotlinTranslatableCompiler.SWIFT -> kotlinProjectExecutor.convertToSwift(project).let {
+        // TODO: A hack to avoid changing the return type of the function.
+        object : TranslationResultWithJsCode(it.swiftCode, it.compilerDiagnostics, it.exception) {}
+      }
     }
   }
 

src/main/kotlin/com/compiler/server/controllers/KotlinPlaygroundRestController.kt

@@ -50,6 +50,7 @@ class KotlinPlaygroundRestController(private val kotlinProjectExecutor: KotlinPr
                 debugInfo = false,
               )
               ProjectType.JUNIT -> kotlinProjectExecutor.test(project)
+              ProjectType.SWIFT_EXPORT -> kotlinProjectExecutor.convertToSwift(project)
             }
           }
 

src/main/kotlin/com/compiler/server/model/ExecutionResult.kt

@@ -82,6 +82,14 @@ class JunitExecutionResult(
   override var compilerDiagnostics: CompilerDiagnostics = CompilerDiagnostics()
 ) : ExecutionResult(compilerDiagnostics, exception)
 
+class SwiftExportResult(
+  val swiftCode: String,
+  override var exception: ExceptionDescriptor? = null,
+  @field:JsonProperty("errors")
+  override var compilerDiagnostics: CompilerDiagnostics = CompilerDiagnostics()
+) : ExecutionResult(compilerDiagnostics, exception)
+
+
 private fun unEscapeOutput(value: String) = value.replace("&amp;lt;".toRegex(), "<")
   .replace("&amp;gt;".toRegex(), ">")
   .replace("\r", "")

src/main/kotlin/com/compiler/server/model/KotlinTranslatableCompiler.kt

@@ -3,5 +3,6 @@ package com.compiler.server.model
 enum class KotlinTranslatableCompiler {
   JS,
   WASM,
-  COMPOSE_WASM
+  COMPOSE_WASM,
+  SWIFT,
 }

src/main/kotlin/com/compiler/server/model/Project.kt

@@ -20,7 +20,9 @@ enum class ProjectType(@JsonValue val id: String) {
   CANVAS("canvas"),
   JS_IR("js-ir"),
   WASM("wasm"),
-  COMPOSE_WASM("compose-wasm");
+  COMPOSE_WASM("compose-wasm"),
+  SWIFT_EXPORT("swift-export")
+  ;
 
   fun isJvmRelated(): Boolean = this == JAVA || this == JUNIT
 

src/main/kotlin/com/compiler/server/service/KotlinProjectExecutor.kt

@@ -17,6 +17,7 @@ class KotlinProjectExecutor(
   private val completionProvider: CompletionProvider,
   private val version: VersionInfo,
   private val kotlinToJSTranslator: KotlinToJSTranslator,
+  private val swiftExportTranslator: SwiftExportTranslator,
   private val kotlinEnvironment: KotlinEnvironment,
   private val loggerDetailsStreamer: LoggerDetailsStreamer? = null,
 ) {
@@ -52,6 +53,10 @@ class KotlinProjectExecutor(
     return convertWasmWithConverter(project, debugInfo, kotlinToJSTranslator::doTranslateWithWasm)
   }
 
+  fun convertToSwift(project: Project): SwiftExportResult {
+    return convertSwiftWithConverter(project)
+  }
+
   fun complete(project: Project, line: Int, character: Int): List<Completion> {
     return kotlinEnvironment.environment {
       val file = getFilesFrom(project, it).first()
@@ -76,6 +81,7 @@ class KotlinProjectExecutor(
           project,
           debugInfo = false,
         ).compilerDiagnostics
+      ProjectType.SWIFT_EXPORT -> convertToSwift(project).compilerDiagnostics
     }
   } catch (e: Exception) {
     log.warn("Exception in getting highlight. Project: $project", e)
@@ -114,6 +120,15 @@ class KotlinProjectExecutor(
     }.also { logExecutionResult(project, it) }
   }
 
+  private fun convertSwiftWithConverter(
+    project: Project,
+  ): SwiftExportResult {
+    return kotlinEnvironment.environment { environment ->
+      val files = getFilesFrom(project, environment).map { it.kotlinFile }
+      swiftExportTranslator.translate(files)
+    }.also { logExecutionResult(project, it) }
+  }
+
   private fun logExecutionResult(project: Project, executionResult: ExecutionResult) {
     loggerDetailsStreamer?.logExecutionResult(
       executionResult,

src/test/kotlin/com/compiler/server/SwiftConverterTest.kt

@@ -0,0 +1,99 @@
+package com.compiler.server
+
+import com.compiler.server.base.BaseExecutorTest
+import org.junit.jupiter.api.Test
+import kotlin.test.assertContains
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+class SwiftConverterTest : BaseExecutorTest() {
+
+    private fun exactTest(input: String, expected: String) {
+        val actual = translateToSwift(input)
+        assertEquals(expected, actual.swiftCode.trimEnd())
+    }
+
+    private fun containsTest(input: String, expected: String) {
+        val actual = translateToSwift(input)
+        assertContains(actual.swiftCode.trimEnd(), expected)
+    }
+
+    private fun shouldFailTest(input: String) {
+        val actual = translateToSwift(input)
+        assertTrue(actual.hasErrors())
+    }
+
+    @Test
+    fun basicSwiftExportTest() = containsTest(
+        input = """
+            fun main() {}
+        """.trimIndent(),
+        expected = "public func main() -> Swift.Void"
+    )
+
+    @Test
+    fun `use stdlib declaration`() = containsTest(
+        input = "fun foo(): UInt = 42",
+        expected = """
+            public func foo() -> Swift.UInt32 {
+                fatalError()
+            }
+        """.trimIndent()
+    )
+
+    @Test
+    fun `class declaration`() = exactTest(
+        input = "public class MyClass { public fun A() {}}",
+        expected = """
+        import KotlinRuntime
+
+        public class MyClass : KotlinRuntime.KotlinBase {
+            public override init() {
+                fatalError()
+            }
+            public func A() -> Swift.Void {
+                fatalError()
+            }
+        }
+        """.trimIndent()
+    )
+
+    @Test
+    fun `simple packages`() = exactTest(
+        input = """
+            package foo.bar
+            
+            val myProperty: Int = 42
+        """.trimIndent(),
+        expected = """
+            public extension Playground.foo.bar {
+                public static var myProperty: Swift.Int32 {
+                    get {
+                        fatalError()
+                    }
+                }
+            }
+            public enum foo {
+                public enum bar {
+                }
+            }
+        """.trimIndent()
+    )
+
+    @Test
+    fun `invalid code`() = exactTest(
+        input = "abracadabra",
+        expected = """
+        """.trimIndent()
+    )
+
+    @Test
+    fun `more invalid code`() = exactTest(
+        input = "fun foo(): Bar = error()",
+        expected = """
+            public func foo() -> ERROR_TYPE {
+                fatalError()
+            }
+        """.trimIndent()
+    )
+}

src/test/kotlin/com/compiler/server/base/BaseExecutorTest.kt

@@ -60,6 +60,8 @@ class BaseExecutorTest {
 
   fun translateToJsIr(code: String) = testRunner.translateToJsIr(code)
 
+  fun translateToSwift(code: String) = testRunner.translateToSwift(code)
+
   fun runWithException(code: String, contains: String, message: String? = null) = testRunner.runWithException(code, contains, message)
 
   fun version() = testRunner.getVersion()

src/test/kotlin/com/compiler/server/generator/TestProjectRunner.kt

@@ -63,6 +63,11 @@ class TestProjectRunner {
     )
   }
 
+  fun translateToSwift(code: String): SwiftExportResult {
+    val project = generateSingleProject(text = code, projectType = ProjectType.SWIFT_EXPORT)
+    return kotlinProjectExecutor.convertToSwift(project)
+  }
+
   fun runWithException(code: String, contains: String, message: String? = null): ExecutionResult {
     val project = generateSingleProject(text = code)
     val result = kotlinProjectExecutor.run(project)

swift-export-playground/README.md

@@ -0,0 +1 @@
+An implementation of Swift export for Kotlin Playground.

swift-export-playground/build.gradle.kts

@@ -0,0 +1,36 @@
+plugins {
+    kotlin("jvm")
+}
+
+repositories {
+    mavenCentral()
+    // For Analysis API components
+    maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/kotlin-ide-plugin-dependencies")
+    maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/swift-export-experimental")
+}
+
+val kotlinVersion = rootProject.properties["systemProp.kotlinVersion"]
+val swiftExportVersion = rootProject.properties["systemProp.swiftExportVersion"]
+
+dependencies {
+    implementation("org.jetbrains.kotlin:kotlin-compiler:$kotlinVersion")
+    // For K/N Distribution class
+    implementation("org.jetbrains.kotlin:kotlin-native-utils:$kotlinVersion")
+
+    // Analysis API components which are required for the Swift export
+    implementation("org.jetbrains.kotlin:analysis-api-standalone-for-ide:$kotlinVersion") { isTransitive = false }
+    implementation("org.jetbrains.kotlin:high-level-api-for-ide:$kotlinVersion") { isTransitive = false }
+    implementation("org.jetbrains.kotlin:high-level-api-fir-for-ide:$kotlinVersion") { isTransitive = false }
+    implementation("org.jetbrains.kotlin:high-level-api-impl-base-for-ide:$kotlinVersion") { isTransitive = false }
+    implementation("org.jetbrains.kotlin:low-level-api-fir-for-ide:$kotlinVersion") { isTransitive = false }
+    implementation("org.jetbrains.kotlin:symbol-light-classes-for-ide:$kotlinVersion") { isTransitive = false }
+
+    // Swift export not-yet-published dependencies.
+    implementation("org.jetbrains.kotlin:sir:$swiftExportVersion") { isTransitive = false }
+    implementation("org.jetbrains.kotlin:sir-providers:$swiftExportVersion") { isTransitive = false }
+    implementation("org.jetbrains.kotlin:sir-light-classes:$swiftExportVersion") { isTransitive = false }
+    implementation("org.jetbrains.kotlin:sir-printer:$swiftExportVersion") { isTransitive = false }
+
+    testImplementation("junit:junit:4.13.2")
+    testImplementation("org.jetbrains.kotlin:kotlin-test:$kotlinVersion")
+}

swift-export-playground/src/main/kotlin/PlaygroundSirSession.kt

@@ -0,0 +1,31 @@
+import org.jetbrains.kotlin.analysis.project.structure.KtModule
+import org.jetbrains.kotlin.sir.providers.SirSession
+import org.jetbrains.kotlin.sir.providers.SirTypeProvider
+import org.jetbrains.kotlin.sir.providers.impl.*
+import org.jetbrains.sir.lightclasses.SirDeclarationFromKtSymbolProvider
+
+internal class PlaygroundSirSession(
+    ktModule: KtModule,
+) : SirSession {
+    override val declarationNamer = SirDeclarationNamerImpl()
+    override val enumGenerator = SirEnumGeneratorImpl()
+    override val moduleProvider = SirSingleModuleProvider("Playground")
+    override val declarationProvider = CachingSirDeclarationProvider(
+        declarationsProvider = SirDeclarationFromKtSymbolProvider(
+            ktModule = ktModule,
+            sirSession = sirSession,
+        )
+    )
+    override val parentProvider = SirParentProviderImpl(
+        sirSession = sirSession,
+    )
+    override val typeProvider = SirTypeProviderImpl(
+        errorTypeStrategy = SirTypeProvider.ErrorTypeStrategy.ErrorType,
+        unsupportedTypeStrategy = SirTypeProvider.ErrorTypeStrategy.ErrorType,
+        sirSession = sirSession,
+    )
+    override val visibilityChecker = SirVisibilityCheckerImpl()
+    override val childrenProvider = SirDeclarationChildrenProviderImpl(
+        sirSession = sirSession,
+    )
+}