Implement "legacy" REPL wrappers on top of the "new" scripting infrastructure

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/repl/AggregatedReplState.kt

@@ -96,5 +96,11 @@ open class AggregatedReplStageState<T1, T2>(val state1: IReplStageState<T1>, val
     override fun getNextLineNo() = state1.getNextLineNo()
 
     override val currentGeneration: Int get() = state1.currentGeneration
+
+    override fun dispose() {
+        state2.dispose()
+        state1.dispose()
+        super.dispose()
+    }
 }
 

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/repl/ReplApi.kt

@@ -90,7 +90,8 @@ sealed class ReplCompileResult : Serializable {
                           val classes: List<CompiledClassData>,
                           val hasResult: Boolean,
                           val classpathAddendum: List<File>,
-                          val type: String?
+                          val type: String?,
+                          val data: Any? // TODO: temporary; migration to new scripting infrastructure
     ) : ReplCompileResult() {
         companion object { private val serialVersionUID: Long = 2L }
     }

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/repl/ReplState.kt

@@ -63,7 +63,6 @@ interface IReplStageState<T> {
         else throw IllegalArgumentException("$this is not an expected instance of IReplStageState")
 
     fun dispose() {
-        history.reset()
     }
 }
 

libraries/scripting/common/src/kotlin/script/experimental/api/scriptCompilation.kt

@@ -249,4 +249,10 @@ interface CompiledScript<out ScriptBase : Any> {
      */
     val otherScripts: List<CompiledScript<*>>
         get() = emptyList()
+
+    /**
+     * The name and the type of the script's result field, if any
+     */
+    val resultField: Pair<String, KotlinType>?
+        get() = null
 }

libraries/scripting/common/src/kotlin/script/experimental/api/scriptEvaluation.kt

@@ -50,6 +50,13 @@ val ScriptEvaluationConfigurationKeys.providedProperties by PropertiesCollection
  */
 val ScriptEvaluationConfigurationKeys.constructorArgs by PropertiesCollection.key<List<Any?>>()
 
+/**
+ * If the script is a snippet in a REPL, this property expected to contain previous REPL snippets in historical order
+ * For the first snippet in a REPL an empty list should be passed explicitly
+ * An array of the previous snippets will be passed to the current snippet constructor
+ */
+val ScriptEvaluationConfigurationKeys.previousSnippets by PropertiesCollection.key<List<Any>>()
+
 @Deprecated("use scriptsInstancesSharing flag instead", level = DeprecationLevel.ERROR)
 val ScriptEvaluationConfigurationKeys.scriptsInstancesSharingMap by PropertiesCollection.key<MutableMap<KClass<*>, EvaluationResult>>()
 
@@ -101,6 +108,11 @@ sealed class ResultValue {
         override fun toString(): String = "$name: $type = $value"
     }
 
+    class UnitValue(val scriptInstance: Any) : ResultValue() {
+        override fun toString(): String = "Unit"
+    }
+
+    // TODO: obsolete it, use differently named value in the saving evaluators
     object Unit : ResultValue()
 }
 

libraries/scripting/common/src/kotlin/script/experimental/util/propertiesCollection.kt

@@ -75,6 +75,10 @@ open class PropertiesCollection(private val properties: Map<Key<*>, Any?> = empt
             data[this] = v
         }
 
+        fun <T> PropertiesCollection.Key<T>.put(v: T) {
+            data[this] = v
+        }
+
         // generic for lists
 
         operator fun <T> PropertiesCollection.Key<in List<T>>.invoke(vararg vals: T) {

libraries/scripting/jvm-host/src/kotlin/script/experimental/jvmhost/impl/KJvmReplCompilerImpl.kt

@@ -10,7 +10,10 @@ import com.intellij.openapi.project.Project
 import org.jetbrains.kotlin.cli.common.environment.setIdeaIoUseFallback
 import org.jetbrains.kotlin.cli.common.messages.AnalyzerWithCompilerReport
 import org.jetbrains.kotlin.cli.common.messages.MessageCollectorBasedReporter
-import org.jetbrains.kotlin.cli.common.repl.*
+import org.jetbrains.kotlin.cli.common.repl.IReplStageHistory
+import org.jetbrains.kotlin.cli.common.repl.LineId
+import org.jetbrains.kotlin.cli.common.repl.ReplCodeLine
+import org.jetbrains.kotlin.cli.common.repl.scriptResultFieldName
 import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
 import org.jetbrains.kotlin.codegen.ClassBuilderFactories
 import org.jetbrains.kotlin.codegen.CompilationErrorHandler
@@ -32,7 +35,7 @@ class KJvmReplCompilerImpl(val hostConfiguration: ScriptingHostConfiguration) :
         return ReplCompilationState(context)
     }
 
-    fun checkSyntax(
+    override fun checkSyntax(
         script: SourceCode,
         scriptCompilationConfiguration: ScriptCompilationConfiguration,
         project: Project
@@ -44,13 +47,18 @@ class KJvmReplCompilerImpl(val hostConfiguration: ScriptingHostConfiguration) :
                 override val messageCollector = messageCollector
             }
             val syntaxErrorReport = AnalyzerWithCompilerReport.reportSyntaxErrors(ktFile, errorHolder)
-            if (syntaxErrorReport.isHasErrors) failure(messageCollector) else true.asSuccess()
+            when {
+                syntaxErrorReport.isHasErrors && syntaxErrorReport.isAllErrorsAtEof -> false.asSuccess(messageCollector.diagnostics)
+                syntaxErrorReport.isHasErrors -> failure(messageCollector)
+                else -> true.asSuccess()
+            }
         }
 
-    fun compileReplSnippet(
+    override fun compileReplSnippet(
         compilationState: JvmReplCompilerState.Compilation,
         snippet: SourceCode,
         snippetId: ReplSnippetId,
+        // TODO: replace history with some interface based on CompiledScript
         history: IReplStageHistory<ScriptDescriptor>
     ): ResultWithDiagnostics<CompiledScript<*>> =
         withMessageCollector(snippet) { messageCollector ->
@@ -108,7 +116,6 @@ class KJvmReplCompilerImpl(val hostConfiguration: ScriptingHostConfiguration) :
                 CompilationErrorHandler.THROW_EXCEPTION
             )
 
-            val generatedClassname = makeScriptBaseName(codeLine)
             history.push(LineId(codeLine), scriptDescriptor)
 
             val compiledScript =
@@ -133,4 +140,3 @@ internal class ReplCompilationState(val context: SharedScriptCompilationContext)
 internal fun makeReplCodeLine(id: ReplSnippetId, code: SourceCode): ReplCodeLine =
     ReplCodeLine(id.no, id.generation, code.text)
 
-

libraries/scripting/jvm-host/src/kotlin/script/experimental/jvmhost/impl/compilationContext.kt

@@ -62,10 +62,7 @@ internal fun createSharedCompilationContext(
             scriptCompilationConfiguration, hostConfiguration, scriptCompilationState, messageCollector, ignoredOptionsReportingState
         )
     val environment =
-        if (System.getProperty("idea.is.unit.test") == "true") KotlinCoreEnvironment.createForTests(
-            disposable, kotlinCompilerConfiguration, EnvironmentConfigFiles.JVM_CONFIG_FILES
-        )
-        else KotlinCoreEnvironment.createForProduction(
+        KotlinCoreEnvironment.createForProduction(
             disposable, kotlinCompilerConfiguration, EnvironmentConfigFiles.JVM_CONFIG_FILES
         )
 

libraries/scripting/jvm-host/src/kotlin/script/experimental/jvmhost/impl/jvmCompilationUtil.kt

@@ -18,6 +18,7 @@ import org.jetbrains.kotlin.codegen.state.GenerationState
 import org.jetbrains.kotlin.idea.KotlinLanguage
 import org.jetbrains.kotlin.psi.KtFile
 import org.jetbrains.kotlin.psi.KtScript
+import org.jetbrains.kotlin.renderer.DescriptorRenderer
 import org.jetbrains.kotlin.scripting.dependencies.ScriptsCompilationDependencies
 import org.jetbrains.kotlin.utils.addToStdlib.firstIsInstanceOrNull
 import java.util.*
@@ -71,7 +72,7 @@ internal inline fun <T> withMessageCollectorAndDisposable(
         failure(messageCollector, ex.asDiagnostics(path = locationId))
     } finally {
         if (disposeOnSuccess || failed) {
-            disposable.dispose()
+            Disposer.dispose(disposable)
         }
     }
 }
@@ -134,6 +135,7 @@ internal fun makeCompiledScript(
                         containingKtFile.virtualFile?.path,
                         getScriptConfiguration(sourceFile),
                         it.fqName.asString(),
+                        null,
                         makeOtherScripts(it),
                         null
                     )
@@ -145,10 +147,18 @@ internal fun makeCompiledScript(
     }
 
     val module = makeCompiledModule(generationState)
+
+    val resultField = with(generationState.replSpecific) {
+        // TODO: pass it in the configuration instead
+        if (!hasResult || resultType == null || scriptResultFieldName == null) null
+        else scriptResultFieldName!! to KotlinType(DescriptorRenderer.FQ_NAMES_IN_TYPES.renderType(resultType!!))
+    }
+
     return KJvmCompiledScript(
         script.locationId,
         getScriptConfiguration(ktScript.containingKtFile),
         ktScript.fqName.asString(),
+        resultField,
         makeOtherScripts(ktScript),
         module
     )

libraries/scripting/jvm-host/src/kotlin/script/experimental/jvmhost/repl/jvmReplCompilation.kt

@@ -5,112 +5,25 @@
 
 package kotlin.script.experimental.jvmhost.repl
 
-import com.intellij.openapi.Disposable
-import com.intellij.openapi.util.Disposer
-import org.jetbrains.kotlin.cli.common.repl.*
-import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
+import com.intellij.openapi.project.Project
+import org.jetbrains.kotlin.cli.common.repl.IReplStageHistory
 import org.jetbrains.kotlin.descriptors.ScriptDescriptor
-import org.jetbrains.kotlin.scripting.repl.ReplCodeAnalyzer
-import java.util.concurrent.locks.ReentrantReadWriteLock
-import kotlin.concurrent.read
-import kotlin.concurrent.write
-import kotlin.script.experimental.api.ScriptCompilationConfiguration
-import kotlin.script.experimental.host.ScriptingHostConfiguration
-import kotlin.script.experimental.jvm.defaultJvmScriptingHostConfiguration
-import kotlin.script.experimental.jvmhost.impl.KJvmCompilerImpl
-import kotlin.script.experimental.jvmhost.impl.withDefaults
-
-class JvmReplCompiler(
-    val scriptCompilationConfiguration: ScriptCompilationConfiguration,
-    val hostConfiguration: ScriptingHostConfiguration = defaultJvmScriptingHostConfiguration,
-    val replCompilerProxy: KJvmReplCompilerProxy = KJvmCompilerImpl(hostConfiguration.withDefaults())
-) : ReplCompiler {
-
-    override fun createState(lock: ReentrantReadWriteLock): IReplStageState<*> = JvmReplCompilerState(replCompilerProxy, lock)
-
-    override fun check(state: IReplStageState<*>, codeLine: ReplCodeLine): ReplCheckResult {
-        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
-    }
-
-    override fun compile(state: IReplStageState<*>, codeLine: ReplCodeLine): ReplCompileResult {
-        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
-    }
-
-
-}
+import kotlin.script.experimental.api.*
 
 interface KJvmReplCompilerProxy {
     fun createReplCompilationState(scriptCompilationConfiguration: ScriptCompilationConfiguration): JvmReplCompilerState.Compilation
-}
 
-class JvmReplCompilerStageHistory(private val state: JvmReplCompilerState) :
-    BasicReplStageHistory<ScriptDescriptor>(state.lock) {
+    fun checkSyntax(
+        script: SourceCode,
+        scriptCompilationConfiguration: ScriptCompilationConfiguration,
+        project: Project
+    ): ResultWithDiagnostics<Boolean>
 
-    override fun reset(): Iterable<ILineId> {
-        val removedCompiledLines = super.reset()
-        val removedAnalyzedLines = state.compilation.analyzerEngine.reset()
 
-        checkConsistent(removedCompiledLines, removedAnalyzedLines)
-        return removedCompiledLines
-    }
-
-    override fun resetTo(id: ILineId): Iterable<ILineId> {
-        val removedCompiledLines = super.resetTo(id)
-        val removedAnalyzedLines = state.compilation.analyzerEngine.resetToLine(id)
-
-        checkConsistent(removedCompiledLines, removedAnalyzedLines)
-        return removedCompiledLines
-    }
-
-    private fun checkConsistent(removedCompiledLines: Iterable<ILineId>, removedAnalyzedLines: List<ReplCodeLine>) {
-        removedCompiledLines.zip(removedAnalyzedLines).forEach { (removedCompiledLine, removedAnalyzedLine) ->
-            if (removedCompiledLine != LineId(removedAnalyzedLine)) {
-                throw IllegalStateException("History mismatch when resetting lines: ${removedCompiledLine.no} != $removedAnalyzedLine")
-            }
-        }
-    }
-}
-
-class JvmReplCompilerState(
-    val replCompilerProxy: KJvmReplCompilerProxy,
-    override val lock: ReentrantReadWriteLock = ReentrantReadWriteLock()
-) : IReplStageState<ScriptDescriptor> {
-
-    override val history = JvmReplCompilerStageHistory(this)
-
-    override val currentGeneration: Int get() = (history as BasicReplStageHistory<*>).currentGeneration.get()
-
-    override fun dispose() {
-        lock.write {
-            _compilation?.disposable?.dispose()
-            _compilation = null
-            super.dispose()
-        }
-    }
-
-    fun getCompilationState(scriptCompilationConfiguration: ScriptCompilationConfiguration): Compilation = lock.write {
-        if (_compilation == null) {
-            initializeCompilation(scriptCompilationConfiguration)
-        }
-        _compilation!!
-    }
-
-    internal val compilation: Compilation
-        get() = _compilation ?: throw IllegalStateException("Compilation state is either not initializad or already destroyed")
-
-    private var _compilation: Compilation? = null
-
-    val isCompilationInitialized get() = _compilation != null
-
-    private fun initializeCompilation(scriptCompilationConfiguration: ScriptCompilationConfiguration) {
-        if (_compilation != null) throw IllegalStateException("Compilation state is already initialized")
-        _compilation = replCompilerProxy.createReplCompilationState(scriptCompilationConfiguration)
-    }
-
-    interface Compilation {
-        val disposable: Disposable
-        val baseScriptCompilationConfiguration: ScriptCompilationConfiguration
-        val environment: KotlinCoreEnvironment
-        val analyzerEngine: ReplCodeAnalyzer
-    }
-}
+    fun compileReplSnippet(
+        compilationState: JvmReplCompilerState.Compilation,
+        snippet: SourceCode,
+        snippetId: ReplSnippetId,
+        history: IReplStageHistory<ScriptDescriptor>
+    ): ResultWithDiagnostics<CompiledScript<*>>
+}

libraries/scripting/jvm-host/src/kotlin/script/experimental/jvmhost/repl/legacyReplCompilation.kt

@@ -0,0 +1,156 @@
+/*
+ * Copyright 2010-2019 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 kotlin.script.experimental.jvmhost.repl
+
+import com.intellij.openapi.Disposable
+import com.intellij.openapi.util.Disposer
+import org.jetbrains.kotlin.cli.common.repl.*
+import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
+import org.jetbrains.kotlin.descriptors.ScriptDescriptor
+import org.jetbrains.kotlin.scripting.repl.ReplCodeAnalyzer
+import java.util.concurrent.locks.ReentrantReadWriteLock
+import kotlin.concurrent.write
+import kotlin.script.experimental.api.*
+import kotlin.script.experimental.host.ScriptingHostConfiguration
+import kotlin.script.experimental.jvm.defaultJvmScriptingHostConfiguration
+import kotlin.script.experimental.jvmhost.impl.KJvmReplCompilerImpl
+import kotlin.script.experimental.jvmhost.impl.withDefaults
+
+/**
+ * REPL Compilation wrapper for "legacy" REPL APIs defined in the org.jetbrains.kotlin.cli.common.repl package
+ */
+class JvmReplCompiler(
+    val scriptCompilationConfiguration: ScriptCompilationConfiguration,
+    val hostConfiguration: ScriptingHostConfiguration = defaultJvmScriptingHostConfiguration,
+    val replCompilerProxy: KJvmReplCompilerProxy = KJvmReplCompilerImpl(hostConfiguration.withDefaults())
+) : ReplCompiler {
+
+    override fun createState(lock: ReentrantReadWriteLock): IReplStageState<*> = JvmReplCompilerState(replCompilerProxy, lock)
+
+    override fun check(state: IReplStageState<*>, codeLine: ReplCodeLine): ReplCheckResult = state.lock.write {
+        val replCompilerState = state.asState(JvmReplCompilerState::class.java)
+        val compilation = replCompilerState.getCompilationState(scriptCompilationConfiguration)
+        val res =
+            replCompilerProxy.checkSyntax(
+                codeLine.toSourceCode(scriptCompilationConfiguration),
+                compilation.baseScriptCompilationConfiguration,
+                compilation.environment.project
+            )
+        when {
+            // TODO: implement diagnostics rendering
+            res is ResultWithDiagnostics.Success && res.value -> ReplCheckResult.Ok()
+            res is ResultWithDiagnostics.Success && !res.value -> ReplCheckResult.Incomplete()
+            else -> ReplCheckResult.Error(res.reports.joinToString("\n") { it.message })
+        }
+    }
+
+    override fun compile(state: IReplStageState<*>, codeLine: ReplCodeLine): ReplCompileResult = state.lock.write {
+        val replCompilerState = state.asState(JvmReplCompilerState::class.java)
+        val compilation = replCompilerState.getCompilationState(scriptCompilationConfiguration)
+        val snippet = codeLine.toSourceCode(scriptCompilationConfiguration)
+        val snippetId = ReplSnippetIdImpl(codeLine.no, codeLine.generation, snippet)
+        when (val res = replCompilerProxy.compileReplSnippet(compilation, snippet, snippetId, replCompilerState.history)) {
+            is ResultWithDiagnostics.Success ->
+                ReplCompileResult.CompiledClasses(
+                    LineId(codeLine),
+                    replCompilerState.history.map { it.id },
+                    snippet.name!!,
+                    emptyList(),
+                    res.value.resultField != null,
+                    emptyList(),
+                    res.value.resultField?.second?.typeName,
+                    res.value
+                )
+            else -> ReplCompileResult.Error(res.reports.joinToString("\n") { it.message })
+        }
+    }
+}
+
+class JvmReplCompilerStageHistory(private val state: JvmReplCompilerState) :
+    BasicReplStageHistory<ScriptDescriptor>(state.lock) {
+
+    override fun reset(): Iterable<ILineId> {
+        val removedCompiledLines = super.reset()
+        val removedAnalyzedLines = state.compilation.analyzerEngine.reset()
+
+        checkConsistent(removedCompiledLines, removedAnalyzedLines)
+        return removedCompiledLines
+    }
+
+    override fun resetTo(id: ILineId): Iterable<ILineId> {
+        val removedCompiledLines = super.resetTo(id)
+        val removedAnalyzedLines = state.compilation.analyzerEngine.resetToLine(id)
+
+        checkConsistent(removedCompiledLines, removedAnalyzedLines)
+        return removedCompiledLines
+    }
+
+    private fun checkConsistent(removedCompiledLines: Iterable<ILineId>, removedAnalyzedLines: List<ReplCodeLine>) {
+        removedCompiledLines.zip(removedAnalyzedLines).forEach { (removedCompiledLine, removedAnalyzedLine) ->
+            if (removedCompiledLine != LineId(removedAnalyzedLine)) {
+                throw IllegalStateException("History mismatch when resetting lines: ${removedCompiledLine.no} != $removedAnalyzedLine")
+            }
+        }
+    }
+}
+
+class JvmReplCompilerState(
+    val replCompilerProxy: KJvmReplCompilerProxy,
+    override val lock: ReentrantReadWriteLock = ReentrantReadWriteLock()
+) : IReplStageState<ScriptDescriptor> {
+
+    override val history = JvmReplCompilerStageHistory(this)
+
+    override val currentGeneration: Int get() = (history as BasicReplStageHistory<*>).currentGeneration.get()
+
+    override fun dispose() {
+        lock.write {
+            _compilation?.disposable?.let {
+                Disposer.dispose(it)
+            }
+            _compilation = null
+            super.dispose()
+        }
+    }
+
+    fun getCompilationState(scriptCompilationConfiguration: ScriptCompilationConfiguration): Compilation = lock.write {
+        if (_compilation == null) {
+            initializeCompilation(scriptCompilationConfiguration)
+        }
+        _compilation!!
+    }
+
+    internal val compilation: Compilation
+        get() = _compilation ?: throw IllegalStateException("Compilation state is either not initializad or already destroyed")
+
+    private var _compilation: Compilation? = null
+
+    val isCompilationInitialized get() = _compilation != null
+
+    private fun initializeCompilation(scriptCompilationConfiguration: ScriptCompilationConfiguration) {
+        if (_compilation != null) throw IllegalStateException("Compilation state is already initialized")
+        _compilation = replCompilerProxy.createReplCompilationState(scriptCompilationConfiguration)
+    }
+
+    interface Compilation {
+        val disposable: Disposable
+        val baseScriptCompilationConfiguration: ScriptCompilationConfiguration
+        val environment: KotlinCoreEnvironment
+        val analyzerEngine: ReplCodeAnalyzer
+    }
+}
+
+internal class SourceCodeFromReplCodeLine(
+    val codeLine: ReplCodeLine,
+    compilationConfiguration: ScriptCompilationConfiguration
+) : SourceCode {
+    override val text: String get() = codeLine.code
+    override val name: String = "${makeScriptBaseName(codeLine)}.${compilationConfiguration[ScriptCompilationConfiguration.fileExtension]}"
+    override val locationId: String? = null
+}
+
+internal fun ReplCodeLine.toSourceCode(compilationConfiguration: ScriptCompilationConfiguration): SourceCode =
+    SourceCodeFromReplCodeLine(this, compilationConfiguration)

libraries/scripting/jvm-host/src/kotlin/script/experimental/jvmhost/repl/legacyReplEvaluation.kt

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2010-2019 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 kotlin.script.experimental.jvmhost.repl
+
+import kotlinx.coroutines.runBlocking
+import org.jetbrains.kotlin.cli.common.repl.*
+import java.util.concurrent.locks.ReentrantReadWriteLock
+import kotlin.concurrent.write
+import kotlin.script.experimental.api.*
+import kotlin.script.experimental.jvm.BasicJvmScriptEvaluator
+import kotlin.script.experimental.jvm.baseClassLoader
+import kotlin.script.experimental.jvm.impl.KJvmCompiledScript
+import kotlin.script.experimental.jvm.jvm
+
+/**
+ * REPL Evaluation wrapper for "legacy" REPL APIs defined in the org.jetbrains.kotlin.cli.common.repl package
+ */
+class JvmReplEvaluator(
+    val baseScriptEvaluationConfiguration: ScriptEvaluationConfiguration,
+    val scriptEvaluator: ScriptEvaluator = BasicJvmScriptEvaluator()
+) : ReplEvaluator {
+
+    override fun createState(lock: ReentrantReadWriteLock): IReplStageState<*> =
+        JvmReplEvaluatorState(baseScriptEvaluationConfiguration, lock)
+
+    override fun eval(
+        state: IReplStageState<*>,
+        compileResult: ReplCompileResult.CompiledClasses,
+        scriptArgs: ScriptArgsWithTypes?,
+        invokeWrapper: InvokeWrapper?
+    ): ReplEvalResult = state.lock.write {
+        val evalState = state.asState(JvmReplEvaluatorState::class.java)
+        val compiledScript = (compileResult.data as? KJvmCompiledScript<*>)
+            ?: return ReplEvalResult.Error.CompileTime("Unable to access compiled script: ${compileResult.data}")
+
+        val lastSnippetInstance = evalState.history.peek()?.item
+        val currentConfiguration = ScriptEvaluationConfiguration(baseScriptEvaluationConfiguration) {
+            if (evalState.history.isNotEmpty()) {
+                previousSnippets.put(evalState.history.map { it.item })
+            }
+            if (lastSnippetInstance != null) {
+                jvm {
+                    baseClassLoader(lastSnippetInstance::class.java.classLoader)
+                }
+            }
+        }
+
+        val res = runBlocking { scriptEvaluator(compiledScript, currentConfiguration) }
+
+        when (res) {
+            is ResultWithDiagnostics.Success -> when (val retVal = res.value.returnValue) {
+                is ResultValue.Value -> {
+                    evalState.history.push(compileResult.lineId, retVal.scriptInstance)
+                    // TODO: the latter check is temporary while the result is used to return the instance too
+                    if (retVal.type.isNotBlank())
+                        ReplEvalResult.ValueResult(retVal.name, retVal.value, retVal.type)
+                    else
+                        ReplEvalResult.UnitResult()
+                }
+                is ResultValue.UnitValue -> {
+                    evalState.history.push(compileResult.lineId, retVal.scriptInstance)
+                    ReplEvalResult.UnitResult()
+                }
+                else -> throw IllegalStateException("Expecting value with script instance, got $retVal")
+            }
+            else -> ReplEvalResult.Error.Runtime(res.reports.joinToString("\n") { it.message })
+        }
+    }
+}
+
+open class JvmReplEvaluatorState(
+    scriptEvaluationConfiguration: ScriptEvaluationConfiguration,
+    override val lock: ReentrantReadWriteLock = ReentrantReadWriteLock()
+) : IReplStageState<Any> {
+
+    override val history: IReplStageHistory<Any> = BasicReplStageHistory(lock)
+
+    override val currentGeneration: Int get() = (history as BasicReplStageHistory<*>).currentGeneration.get()
+
+    val topClassLoader: ClassLoader = scriptEvaluationConfiguration[ScriptEvaluationConfiguration.jvm.baseClassLoader]!!
+}

libraries/scripting/jvm-host/test/kotlin/script/experimental/jvmhost/test/LegacyReplTest.kt

@@ -0,0 +1,175 @@
+/*
+ * Copyright 2010-2019 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 kotlin.script.experimental.jvmhost.test
+
+import com.intellij.openapi.application.ApplicationManager
+import junit.framework.TestCase
+import org.jetbrains.kotlin.cli.common.repl.*
+import org.jetbrains.kotlin.test.testFramework.KtUsefulTestCase
+import org.jetbrains.kotlin.test.testFramework.KtUsefulTestCase.resetApplicationToNull
+import java.io.Closeable
+import java.util.concurrent.atomic.AtomicInteger
+import java.util.concurrent.locks.ReentrantReadWriteLock
+import kotlin.script.experimental.jvmhost.repl.JvmReplCompiler
+import kotlin.script.experimental.jvmhost.repl.JvmReplEvaluator
+
+// Adapted form GenericReplTest
+
+class LegacyReplTest : KtUsefulTestCase() {
+    fun testReplBasics() {
+        LegacyTestRepl().use { repl ->
+            val res1 = repl.replCompiler.check(repl.state, ReplCodeLine(0, 0, "val x ="))
+            TestCase.assertTrue("Unexpected check results: $res1", res1 is ReplCheckResult.Incomplete)
+
+            assertEvalResult(repl, "val l1 = listOf(1 + 2)\nl1.first()", 3)
+
+            assertEvalUnit(repl, "val x = 5")
+
+            assertEvalResult(repl, "x + 2", 7)
+        }
+    }
+
+    fun testReplErrors() {
+        LegacyTestRepl().use { repl ->
+            repl.compileAndEval(repl.nextCodeLine("val x = 10"))
+
+            val res = repl.compileAndEval(repl.nextCodeLine("java.util.fish"))
+            TestCase.assertTrue("Expected compile error", res.first is ReplCompileResult.Error)
+
+            val result = repl.compileAndEval(repl.nextCodeLine("x"))
+            assertEquals(res.second.toString(), 10, (result.second as? ReplEvalResult.ValueResult)?.value)
+        }
+    }
+
+    fun testReplCodeFormat() {
+        LegacyTestRepl().use { repl ->
+            val codeLine0 = ReplCodeLine(0, 0, "val l1 = 1\r\nl1\r\n")
+            val res0 = repl.replCompiler.check(repl.state, codeLine0)
+            val res0c = res0 as? ReplCheckResult.Ok
+            TestCase.assertNotNull("Unexpected compile result: $res0", res0c)
+        }
+    }
+
+    fun testRepPackage() {
+        LegacyTestRepl().use { repl ->
+            assertEvalResult(repl, "package mypackage\n\nval x = 1\nx+2", 3)
+
+            assertEvalResult(repl, "x+4", 5)
+        }
+    }
+
+    fun test256Evals() {
+        LegacyTestRepl().use { repl ->
+            repl.compileAndEval(ReplCodeLine(0, 0, "val x0 = 0"))
+
+            val evals = 256
+            for (i in 1..evals) {
+                repl.compileAndEval(ReplCodeLine(i, 0, "val x$i = x${i-1} + 1"))
+            }
+
+            val res = repl.compileAndEval(ReplCodeLine(evals + 1, 0, "x$evals"))
+            assertEquals(res.second.toString(), evals, (res.second as? ReplEvalResult.ValueResult)?.value)
+        }
+    }
+
+    fun testReplSlowdownKt22740() {
+        LegacyTestRepl().use { repl ->
+            repl.compileAndEval(ReplCodeLine(0, 0, "class Test<T>(val x: T) { fun <R> map(f: (T) -> R): R = f(x) }".trimIndent()))
+
+            // We expect that analysis time is not exponential
+            for (i in 1..60) {
+                repl.compileAndEval(ReplCodeLine(i, 0, "fun <T> Test<T>.map(f: (T) -> Double): List<Double> = listOf(f(this.x))"))
+            }
+        }
+    }
+
+    fun testReplResultFieldWithFunction() {
+        LegacyTestRepl().use { repl ->
+            assertEvalResultIs<Function0<Int>>(repl, "{ 1 + 2 }")
+            assertEvalResultIs<Function0<Int>>(repl, "res0")
+            assertEvalResult(repl, "res0()", 3)
+        }
+    }
+
+    fun testReplResultField() {
+        LegacyTestRepl().use { repl ->
+            assertEvalResult(repl, "5 * 4", 20)
+            assertEvalResult(repl, "res0 + 3", 23)
+        }
+    }
+
+    private fun assertEvalUnit(repl: LegacyTestRepl, line: String) {
+        val compiledClasses = checkCompile(repl, line)
+
+        val evalResult = repl.compiledEvaluator.eval(repl.state, compiledClasses!!)
+        val unitResult = evalResult as? ReplEvalResult.UnitResult
+        TestCase.assertNotNull("Unexpected eval result: $evalResult", unitResult)
+    }
+
+    private fun<R> assertEvalResult(repl: LegacyTestRepl, line: String, expectedResult: R) {
+        val compiledClasses = checkCompile(repl, line)
+
+        val evalResult = repl.compiledEvaluator.eval(repl.state, compiledClasses!!)
+        val valueResult = evalResult as? ReplEvalResult.ValueResult
+        TestCase.assertNotNull("Unexpected eval result: $evalResult", valueResult)
+        TestCase.assertEquals(expectedResult, valueResult!!.value)
+    }
+
+    private inline fun<reified R> assertEvalResultIs(repl: LegacyTestRepl, line: String) {
+        val compiledClasses = checkCompile(repl, line)
+
+        val evalResult = repl.compiledEvaluator.eval(repl.state, compiledClasses!!)
+        val valueResult = evalResult as? ReplEvalResult.ValueResult
+        TestCase.assertNotNull("Unexpected eval result: $evalResult", valueResult)
+        TestCase.assertTrue(valueResult!!.value is R)
+    }
+
+    private fun checkCompile(repl: LegacyTestRepl, line: String): ReplCompileResult.CompiledClasses? {
+        val codeLine = repl.nextCodeLine(line)
+        val compileResult = repl.replCompiler.compile(repl.state, codeLine)
+        val compiledClasses = compileResult as? ReplCompileResult.CompiledClasses
+        TestCase.assertNotNull("Unexpected compile result: $compileResult", compiledClasses)
+        return compiledClasses
+    }
+}
+
+
+internal class LegacyTestRepl : Closeable {
+    val application = ApplicationManager.getApplication()
+
+    val currentLineCounter = AtomicInteger()
+
+    fun nextCodeLine(code: String): ReplCodeLine = ReplCodeLine(currentLineCounter.getAndIncrement(), 0, code)
+
+    val replCompiler: JvmReplCompiler by lazy {
+        JvmReplCompiler(simpleScriptompilationConfiguration)
+    }
+
+    val compiledEvaluator: ReplEvaluator by lazy {
+        JvmReplEvaluator(simpleScriptEvaluationConfiguration)
+    }
+
+    val state by lazy {
+        val stateLock = ReentrantReadWriteLock()
+        AggregatedReplStageState(replCompiler.createState(stateLock), compiledEvaluator.createState(stateLock), stateLock)
+    }
+
+    override fun close() {
+        state.dispose()
+        resetApplicationToNull(application)
+    }
+}
+
+private fun LegacyTestRepl.compileAndEval(codeLine: ReplCodeLine): Pair<ReplCompileResult, ReplEvalResult?> {
+
+    val compRes = replCompiler.compile(state, codeLine)
+
+    val evalRes = (compRes as? ReplCompileResult.CompiledClasses)?.let {
+
+        compiledEvaluator.eval(state, it)
+    }
+    return compRes to evalRes
+}

libraries/scripting/jvm-host/test/kotlin/script/experimental/jvmhost/test/ReplTest.kt

@@ -0,0 +1,112 @@
+/*
+ * Copyright 2010-2019 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 kotlin.script.experimental.jvmhost.test
+
+import junit.framework.TestCase
+import kotlinx.coroutines.runBlocking
+import org.jetbrains.kotlin.cli.common.repl.BasicReplStageHistory
+import org.jetbrains.kotlin.descriptors.ScriptDescriptor
+import org.junit.Assert
+import org.junit.Test
+import kotlin.script.experimental.annotations.KotlinScript
+import kotlin.script.experimental.api.*
+import kotlin.script.experimental.host.toScriptSource
+import kotlin.script.experimental.jvm.*
+import kotlin.script.experimental.jvmhost.createJvmCompilationConfigurationFromTemplate
+import kotlin.script.experimental.jvmhost.impl.KJvmReplCompilerImpl
+
+class ReplTest : TestCase() {
+
+    companion object {
+        const val TEST_DATA_DIR = "libraries/scripting/jvm-host/testData"
+    }
+
+    @Test
+    fun testCompileAndEval() {
+        val out = captureOut {
+            chechEvaluateInReplNoErrors(
+                simpleScriptompilationConfiguration,
+                simpleScriptEvaluationConfiguration,
+                sequenceOf(
+                    "val x = 3",
+                    "x + 4",
+                    "println(\"x = \$x\")"
+                ),
+                sequenceOf(null, 7, null)
+            )
+        }
+        Assert.assertEquals("x = 3", out)
+    }
+
+    fun evaluateInRepl(
+        compilationConfiguration: ScriptCompilationConfiguration,
+        evaluationConfiguration: ScriptEvaluationConfiguration,
+        snippets: Sequence<String>
+    ): Sequence<ResultWithDiagnostics<EvaluationResult>> {
+        val replCompilerProxy = KJvmReplCompilerImpl(defaultJvmScriptingHostConfiguration)
+        val compilationState = replCompilerProxy.createReplCompilationState(compilationConfiguration)
+        val compilationHistory = BasicReplStageHistory<ScriptDescriptor>()
+        val replEvaluator = BasicJvmScriptEvaluator()
+        var currentEvalConfig = evaluationConfiguration
+        return snippets.mapIndexed { snippetNo, snippetText ->
+            val snippetSource = snippetText.toScriptSource("Line_$snippetNo.simplescript.kts")
+            val snippetId = ReplSnippetIdImpl(snippetNo, 0, snippetSource)
+            replCompilerProxy.compileReplSnippet(compilationState, snippetSource, snippetId, compilationHistory)
+                .onSuccess {
+                    runBlocking {
+                        replEvaluator(it, currentEvalConfig)
+                    }
+                }
+                .onSuccess {
+                    val snippetInstance = when (val retVal = it.returnValue) {
+                        is ResultValue.Value -> retVal.scriptInstance
+                        is ResultValue.UnitValue -> retVal.scriptInstance
+                        else -> throw IllegalStateException("Expecting value with script instance, got $it")
+                    }
+                    currentEvalConfig = ScriptEvaluationConfiguration(currentEvalConfig) {
+                        previousSnippets.append(snippetInstance)
+                        jvm {
+                            baseClassLoader(snippetInstance::class.java.classLoader)
+                        }
+                    }
+                    it.asSuccess()
+                }
+        }
+    }
+
+    fun chechEvaluateInReplNoErrors(
+        compilationConfiguration: ScriptCompilationConfiguration,
+        evaluationConfiguration: ScriptEvaluationConfiguration,
+        snippets: Sequence<String>,
+        expected: Sequence<Any?>
+    ) {
+        val expectedIter = expected.iterator()
+        evaluateInRepl(compilationConfiguration, evaluationConfiguration, snippets).forEachIndexed { index, res ->
+            when (res) {
+                is ResultWithDiagnostics.Failure -> Assert.fail("#$index: Expected result, got $res")
+                is ResultWithDiagnostics.Success -> {
+                    val expectedVal = expectedIter.next()
+                    val resVal = res.value.returnValue
+                    if (resVal is ResultValue.Value && resVal.type.isNotBlank()) // TODO: the latter check is temporary while the result is used to return the instance too
+                        Assert.assertEquals("#$index: Expected $expectedVal, got $resVal", expectedVal, resVal.value)
+                    else
+                        Assert.assertTrue("#$index: Expected $expectedVal, got Unit", expectedVal == null)
+                }
+            }
+        }
+    }
+}
+
+@KotlinScript(fileExtension = "simplescript.kts")
+abstract class SimpleScript
+
+val simpleScriptompilationConfiguration = createJvmCompilationConfigurationFromTemplate<SimpleScript> {
+    jvm {
+        dependenciesFromCurrentContext(wholeClasspath = true)
+    }
+}
+
+val simpleScriptEvaluationConfiguration = ScriptEvaluationConfiguration()

libraries/scripting/jvm-host/test/kotlin/script/experimental/jvmhost/test/ScriptingHostTest.kt

@@ -526,9 +526,9 @@ private class FileBasedScriptCache(val baseDir: File) : ScriptingCacheWithCounte
         get() = _retrievedScripts
 }
 
-private fun captureOut(body: () -> Unit): String = captureOutAndErr(body).first
+internal fun captureOut(body: () -> Unit): String = captureOutAndErr(body).first
 
-private fun captureOutAndErr(body: () -> Unit): Pair<String, String> {
+internal fun captureOutAndErr(body: () -> Unit): Pair<String, String> {
     val outStream = ByteArrayOutputStream()
     val errStream = ByteArrayOutputStream()
     val prevOut = System.out

libraries/scripting/jvm/src/kotlin/script/experimental/jvm/BasicJvmScriptEvaluator.kt

@@ -43,7 +43,15 @@ open class BasicJvmScriptEvaluator : ScriptEvaluator {
                             ?.resultOrNull()
                             ?: configuration
 
-                    scriptClass.evalWithConfigAndOtherScriptsResults(refinedEvalConfiguration, importedScriptsEvalResults).let {
+                    val instance =
+                        scriptClass.evalWithConfigAndOtherScriptsResults(refinedEvalConfiguration, importedScriptsEvalResults)
+
+                    val resultValue = compiledScript.resultField?.let { (resultFieldName, resultType) ->
+                        val resultField = scriptClass.java.getDeclaredField(resultFieldName).apply { isAccessible = true }
+                        ResultValue.Value(resultFieldName, resultField.get(instance), resultType.typeName, instance)
+                    } ?: ResultValue.Value("", instance, "", instance)
+
+                    EvaluationResult(resultValue, refinedEvalConfiguration).let {
                         sharedScripts?.put(scriptClass, it)
                         ResultWithDiagnostics.Success(it)
                     }
@@ -61,9 +69,15 @@ open class BasicJvmScriptEvaluator : ScriptEvaluator {
     private fun KClass<*>.evalWithConfigAndOtherScriptsResults(
         refinedEvalConfiguration: ScriptEvaluationConfiguration,
         importedScriptsEvalResults: List<EvaluationResult>
-    ): EvaluationResult {
+    ): Any {
         val args = ArrayList<Any?>()
 
+        refinedEvalConfiguration[ScriptEvaluationConfiguration.previousSnippets]?.let {
+            if (it.isNotEmpty()) {
+                args.add(it.toTypedArray())
+            }
+        }
+
         refinedEvalConfiguration[ScriptEvaluationConfiguration.constructorArgs]?.let {
             args.addAll(it)
         }
@@ -81,10 +95,7 @@ open class BasicJvmScriptEvaluator : ScriptEvaluator {
         val ctor = java.constructors.single()
         val instance = ctor.newInstance(*args.toArray())
 
-        return EvaluationResult(
-            ResultValue.Value("", instance, "", instance),
-            refinedEvalConfiguration
-        )
+        return instance
     }
 }
 

libraries/scripting/jvm/src/kotlin/script/experimental/jvm/impl/KJvmCompiledScript.kt

@@ -16,6 +16,7 @@ internal class KJvmCompiledScriptData(
     var sourceLocationId: String?,
     var compilationConfiguration: ScriptCompilationConfiguration,
     var scriptClassFQName: String,
+    var resultField: Pair<String, KotlinType>?,
     var otherScripts: List<CompiledScript<*>> = emptyList()
 ) : Serializable {
 
@@ -24,6 +25,7 @@ internal class KJvmCompiledScriptData(
         outputStream.writeObject(sourceLocationId)
         outputStream.writeObject(otherScripts)
         outputStream.writeObject(scriptClassFQName)
+        outputStream.writeObject(resultField)
     }
 
     @Suppress("UNCHECKED_CAST")
@@ -32,11 +34,12 @@ internal class KJvmCompiledScriptData(
         sourceLocationId = inputStream.readObject() as String?
         otherScripts = inputStream.readObject() as List<CompiledScript<*>>
         scriptClassFQName = inputStream.readObject() as String
+        resultField = inputStream.readObject() as Pair<String, KotlinType>?
     }
 
     companion object {
         @JvmStatic
-        private val serialVersionUID = 3L
+        private val serialVersionUID = 4L
     }
 }
 
@@ -49,9 +52,13 @@ class KJvmCompiledScript<out ScriptBase : Any> internal constructor(
         sourceLocationId: String?,
         compilationConfiguration: ScriptCompilationConfiguration,
         scriptClassFQName: String,
+        resultField: Pair<String, KotlinType>?,
         otherScripts: List<CompiledScript<*>> = emptyList(),
         compiledModule: KJvmCompiledModule? // module should be null for imported (other) scripts, so only one reference to the module is kept
-    ): this(KJvmCompiledScriptData(sourceLocationId, compilationConfiguration, scriptClassFQName, otherScripts), compiledModule)
+    ) : this(
+        KJvmCompiledScriptData(sourceLocationId, compilationConfiguration, scriptClassFQName, resultField, otherScripts),
+        compiledModule
+    )
 
     override val sourceLocationId: String?
         get() = data.sourceLocationId
@@ -65,6 +72,9 @@ class KJvmCompiledScript<out ScriptBase : Any> internal constructor(
     val scriptClassFQName: String
         get() = data.scriptClassFQName
 
+    override val resultField: Pair<String, KotlinType>?
+        get() = data.resultField
+
     override suspend fun getClass(scriptEvaluationConfiguration: ScriptEvaluationConfiguration?): ResultWithDiagnostics<KClass<*>> = try {
         // ensuring proper defaults are used
         val actualEvaluationConfiguration = scriptEvaluationConfiguration ?: ScriptEvaluationConfiguration()
@@ -168,7 +178,8 @@ fun KJvmCompiledScript<*>.toBytes(): ByteArray {
     } finally {
         try {
             oos?.close()
-        } catch (e: IOException) {}
+        } catch (e: IOException) {
+        }
     }
 }
 

plugins/scripting/scripting-compiler-impl/src/org/jetbrains/kotlin/scripting/repl/GenericReplCompiler.kt

@@ -115,7 +115,8 @@ open class GenericReplCompiler(
                 classpathAddendum ?: emptyList(),
                 generationState.replSpecific.resultType?.let {
                     DescriptorRenderer.FQ_NAMES_IN_TYPES.renderType(it)
-                }
+                },
+                null
             )
         }
     }