Minor, generate trailing comma in enums in Gradle compiler types

This both simplifies the generator code and makes the generated code
conform to the style guide (see
https://kotlinlang.org/docs/coding-conventions.html#trailing-commas), in
particular it improves version control diffs for generated enums.

generators/tests/org/jetbrains/kotlin/generators/arguments/jsTypesGenerators.kt

@@ -22,11 +22,10 @@ internal fun generateJsMainFunctionExecutionMode(
                 K2JsArgumentConstants::NO_CALL.name to K2JsArgumentConstants.NO_CALL
             )
 
-            val lastIndex = modes.size - 1
-            modes.entries.forEachIndexed { index, mode ->
-                val lastChar = if (index == lastIndex) ";" else ","
-                println("${mode.key}(\"${mode.value}\")$lastChar")
+            for ((key, value) in modes) {
+                println("$key(\"$value\"),")
             }
+            println(";")
 
             println()
             println("companion object {")
@@ -55,11 +54,10 @@ internal fun generateJsModuleKind(
                 K2JsArgumentConstants::MODULE_ES.name to K2JsArgumentConstants.MODULE_ES
             )
 
-            val lastIndex = kinds.size - 1
-            kinds.entries.forEachIndexed { index, mode ->
-                val lastChar = if (index == lastIndex) ";" else ","
-                println("${mode.key}(\"${mode.value}\")$lastChar")
+            for ((key, value) in kinds) {
+                println("$key(\"$value\"),")
             }
+            println(";")
 
             println()
             println("companion object {")
@@ -86,11 +84,10 @@ internal fun generateJsSourceMapEmbedMode(
                 K2JsArgumentConstants::SOURCE_MAP_SOURCE_CONTENT_INLINING.name to K2JsArgumentConstants.SOURCE_MAP_SOURCE_CONTENT_INLINING,
             )
 
-            val lastIndex = modes.size - 1
-            modes.entries.forEachIndexed { index, mode ->
-                val lastChar = if (index == lastIndex) ";" else ","
-                println("${mode.key}(\"${mode.value}\")$lastChar")
+            for ((key, value) in modes) {
+                println("$key(\"$value\"),")
             }
+            println(";")
 
             println()
             println("companion object {")
@@ -111,16 +108,15 @@ internal fun generateJsDiagnosticMode(
     val diagnosticModeFqName = FqName("org.jetbrains.kotlin.gradle.dsl.JsDiagnosticMode")
     filePrinter(fileFromFqName(apiDir, diagnosticModeFqName)) {
         generateDeclaration("enum class", diagnosticModeFqName, afterType = "(val mode: String)") {
-            val mods = hashMapOf(
+            val modes = hashMapOf(
                 K2JsArgumentConstants::RUNTIME_DIAGNOSTIC_EXCEPTION.name to K2JsArgumentConstants.RUNTIME_DIAGNOSTIC_EXCEPTION,
                 K2JsArgumentConstants::RUNTIME_DIAGNOSTIC_LOG.name to K2JsArgumentConstants.RUNTIME_DIAGNOSTIC_LOG,
             )
 
-            val lastIndex = mods.size - 1
-            mods.entries.forEachIndexed { index, mode ->
-                val lastChar = if (index == lastIndex) ";" else ","
-                println("${mode.key}(\"${mode.value}\")$lastChar")
+            for ((key, value) in modes) {
+                println("$key(\"$value\"),")
             }
+            println(";")
 
             println()
             println("companion object {")

generators/tests/org/jetbrains/kotlin/generators/arguments/jvmTargetGenerator.kt

@@ -17,13 +17,10 @@ internal fun generateJvmTarget(
     val jvmTargetFqName = FqName("org.jetbrains.kotlin.gradle.dsl.JvmTarget")
     filePrinter(fileFromFqName(apiDir, jvmTargetFqName)) {
         generateDeclaration("enum class", jvmTargetFqName, afterType = "(val target: String)") {
-            val jvmTargetValues = JvmTarget.supportedValues()
-
-            val lastIndex = jvmTargetValues.size - 1
-            jvmTargetValues.forEachIndexed { index, jvmTarget ->
-                val lastChar = if (index == lastIndex) ";" else ","
-                println("${jvmTarget.name}(\"${jvmTarget.description}\")$lastChar")
+            for (jvmTarget in JvmTarget.supportedValues()) {
+                println("${jvmTarget.name}(\"${jvmTarget.description}\"),")
             }
+            println(";")
 
             println()
             println("companion object {")
@@ -35,4 +32,4 @@ internal fun generateJvmTarget(
             println("}")
         }
     }
-}
+}

generators/tests/org/jetbrains/kotlin/generators/arguments/kotlinVersionGenerator.kt

@@ -21,19 +21,16 @@ internal fun generateKotlinVersion(
     val kotlinVersionFqName = FqName("org.jetbrains.kotlin.gradle.dsl.KotlinVersion")
     filePrinter(fileFromFqName(apiDir, kotlinVersionFqName)) {
         generateDeclaration("enum class", kotlinVersionFqName, afterType = "(val version: String)") {
-            val languageVersions = LanguageVersion.values()
-
-            val lastIndex = languageVersions.size - 1
-            languageVersions.forEachIndexed { index, languageVersion ->
-                val lastChar = if (index == lastIndex) ";" else ","
+            for (languageVersion in LanguageVersion.values()) {
                 val prefix = when {
                     languageVersion.isUnsupported -> "@Deprecated(\"Unsupported\", level = DeprecationLevel.ERROR) "
                     languageVersion.isDeprecated -> "@Deprecated(\"Will be removed soon\") "
                     else -> ""
                 }
 
-                println("${prefix}KOTLIN_${languageVersion.major}_${languageVersion.minor}(\"${languageVersion.versionString}\")$lastChar")
+                println("${prefix}KOTLIN_${languageVersion.major}_${languageVersion.minor}(\"${languageVersion.versionString}\"),")
             }
+            println(";")
 
             println()
             println("companion object {")