Add script host example using embeddable compiler

origin: https://github.com/JetBrains/kotlin/tree/master/libraries/examples/scripting/jvm-embeddable-host

Author: ligee

jvm/basic/jvm-embeddable-host/build.gradle.kts

@@ -0,0 +1,16 @@
+
+plugins {
+    kotlin("jvm")
+}
+
+val kotlinVersion: String by rootProject.extra
+
+dependencies {
+    implementation(project(":jvm:basic:jvm-simple-script:script"))
+    implementation("org.jetbrains.kotlin:kotlin-scripting-jvm:$kotlinVersion")
+    compileOnly("org.jetbrains.kotlin:kotlin-scripting-jvm-host:$kotlinVersion")
+    testRuntimeOnly("org.jetbrains.kotlin:kotlin-scripting-jvm-host-embeddable:$kotlinVersion")
+    testRuntimeOnly("com.google.guava:guava:28.2-jre")
+    testImplementation("junit:junit:4.12")
+}
+

jvm/basic/jvm-embeddable-host/src/main/kotlin/org/jetbrains/kotlin/script/examples/jvm/embeddable/host/host.kt

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2010-2018 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.script.examples.jvm.embeddable.host
+
+import org.jetbrains.kotlin.script.examples.jvm.simple.SimpleScript
+import java.io.File
+import kotlin.script.experimental.api.EvaluationResult
+import kotlin.script.experimental.api.ResultWithDiagnostics
+import kotlin.script.experimental.host.toScriptSource
+import kotlin.script.experimental.jvm.dependenciesFromCurrentContext
+import kotlin.script.experimental.jvm.jvm
+import kotlin.script.experimental.jvmhost.BasicJvmScriptingHost
+import kotlin.script.experimental.jvmhost.createJvmCompilationConfigurationFromTemplate
+
+fun evalFile(scriptFile: File): ResultWithDiagnostics<EvaluationResult> {
+    val compilationConfiguration = createJvmCompilationConfigurationFromTemplate<SimpleScript> {
+        jvm {
+            dependenciesFromCurrentContext(
+                "script", /* script library jar name */
+                "guava",
+                wholeClasspath = true
+            )
+        }
+    }
+
+    return BasicJvmScriptingHost().eval(scriptFile.toScriptSource(), compilationConfiguration, null)
+}
+
+fun main(vararg args: String) {
+    if (args.size != 1) {
+        println("usage: <app> <script file>")
+    } else {
+        val scriptFile = File(args[0])
+        println("Executing script $scriptFile")
+
+        val res = evalFile(scriptFile)
+
+        res.reports.forEach {
+            println(" : ${it.message}" + if (it.exception == null) "" else ": ${it.exception}")
+        }
+    }
+}

jvm/basic/jvm-embeddable-host/src/test/kotlin/org/jetbrains/kotlin/script/examples/jvm/embeddable/test/embeddableTest.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2010-2018 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.script.examples.jvm.embeddable.test
+
+import org.jetbrains.kotlin.script.examples.jvm.embeddable.host.evalFile
+import org.junit.Assert
+import java.io.File
+import org.junit.Test
+import kotlin.script.experimental.api.ResultWithDiagnostics
+
+class SimpleTest {
+
+    @Test
+    fun testSimple() {
+        // guava is packed into the kotlin compiler jar, so this test will fail on the regular compiler jar
+        // see comments in the script file
+        val res = evalFile(File("testData/useGuava.simplescript.kts"))
+
+        Assert.assertTrue(
+            "test failed:\n  ${res.reports.joinToString("\n  ") { it.message + if (it.exception == null) "" else ": ${it.exception}" }}",
+            res is ResultWithDiagnostics.Success
+        )
+    }
+}

jvm/basic/jvm-embeddable-host/testData/useGuava.simplescript.kts

@@ -0,0 +1,11 @@
+
+// assuming to be executed on proguarded compiler in which `newArrayList` is present, but `asList` ist removed
+// first pulling `newArrayList`, so with non-embeddable (not shaded) host/compiler the class `Lists` will be pulled from
+// the guava embedded into compiler, then using `asList`, which should not be present in this version of the class due to proguarding
+// So, the compilation should only succeed if shaded compiler is used and `Lists` are loaded from the non-embedded guava jar
+
+val arr = com.google.common.collect.Lists.newArrayList<Int>()
+val lst = listOf("Hello", "Guava")
+val glist = com.google.common.collect.Lists.asList(lst.first(), lst[1], emptyArray())
+
+println(glist.joinToString(", ", "", "!"))

settings.gradle.kts

@@ -11,3 +11,5 @@ include("jvm:basic:jvm-simple-script:host")
 
 include("jvm:basic:jvm-maven-deps:script")
 include("jvm:basic:jvm-maven-deps:host")
+
+include("jvm:basic:jvm-embeddable-host")