Update to Kotlin 1.5 (and associated deps) (#1339)

adapters/build.gradle.kts

@@ -14,12 +14,20 @@
  * limitations under the License.
  */
 
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
 plugins {
   kotlin("jvm")
   id("com.vanniktech.maven.publish")
   id("ru.vyarus.animalsniffer")
 }
 
+tasks.withType<KotlinCompile>().configureEach {
+  kotlinOptions {
+    jvmTarget = "1.6"
+  }
+}
+
 dependencies {
   compileOnly(Dependencies.jsr305)
   api(project(":moshi"))

build.gradle.kts

@@ -31,8 +31,8 @@ buildscript {
 
 plugins {
   id("com.vanniktech.maven.publish") version "0.14.2" apply false
-  id("org.jetbrains.dokka") version "1.4.30" apply false
-  id("com.diffplug.spotless") version "5.11.0"
+  id("org.jetbrains.dokka") version "1.4.32" apply false
+  id("com.diffplug.spotless") version "5.12.4"
   id("ru.vyarus.animalsniffer") version "1.5.3" apply false
   id("me.champeau.gradle.japicmp") version "0.2.9" apply false
 }

buildSrc/src/main/kotlin/Dependencies.kt

@@ -18,7 +18,7 @@ object Dependencies {
 
   const val asm = "org.ow2.asm:asm:7.1"
   const val jsr305 = "com.google.code.findbugs:jsr305:3.0.2"
-  const val ktlintVersion = "0.39.0"
+  const val ktlintVersion = "0.41.0"
   const val okio = "com.squareup.okio:okio:2.10.0"
 
   object AnimalSniffer {
@@ -39,8 +39,8 @@ object Dependencies {
   }
 
   object Kotlin {
-    const val version = "1.4.32"
-    const val metadata = "org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.2.0"
+    const val version = "1.5.0"
+    const val metadata = "org.jetbrains.kotlinx:kotlinx-metadata-jvm:0.3.0"
   }
 
   object KotlinPoet {
@@ -53,7 +53,7 @@ object Dependencies {
 
   object Testing {
     const val assertj = "org.assertj:assertj-core:3.11.1"
-    const val compileTesting = "com.github.tschuchortdev:kotlin-compile-testing:1.3.6"
+    const val compileTesting = "com.github.tschuchortdev:kotlin-compile-testing:1.4.0"
     const val junit = "junit:junit:4.13.2"
     const val truth = "com.google.truth:truth:1.0.1"
   }

kotlin/codegen/build.gradle.kts

@@ -22,7 +22,7 @@ plugins {
   kotlin("jvm")
   kotlin("kapt")
   id("com.vanniktech.maven.publish")
-  id("com.github.johnrengelman.shadow") version "6.0.0"
+  id("com.github.johnrengelman.shadow") version "7.0.0"
 }
 
 tasks.withType<KotlinCompile>().configureEach {
@@ -102,6 +102,6 @@ val shadowJar = tasks.shadowJar.apply {
 }
 
 artifacts {
-  runtime(shadowJar)
+  runtimeOnly(shadowJar)
   archives(shadowJar)
 }

kotlin/codegen/src/main/java/com/squareup/moshi/kotlin/codegen/api/DelegateKey.kt

@@ -31,6 +31,7 @@ import com.squareup.kotlinpoet.asClassName
 import com.squareup.kotlinpoet.asTypeName
 import com.squareup.moshi.JsonAdapter
 import com.squareup.moshi.Types
+import java.util.Locale
 
 /** A JsonAdapter that can be used to encode and decode a particular field. */
 internal data class DelegateKey(
@@ -50,7 +51,7 @@ internal data class DelegateKey(
       "At${it.typeName.rawType().simpleName}"
     }
     val adapterName = nameAllocator.newName(
-      "${type.toVariableName().decapitalize()}${qualifierNames}Adapter",
+      "${type.toVariableName().replaceFirstChar { it.lowercase(Locale.US) }}${qualifierNames}Adapter",
       this
     )
 

kotlin/reflect/src/main/java/com/squareup/moshi/kotlin/reflect/KotlinJsonAdapter.kt

@@ -188,111 +188,111 @@ internal class KotlinJsonAdapter<T>(
 public class KotlinJsonAdapterFactory : JsonAdapter.Factory {
   override fun create(type: Type, annotations: MutableSet<out Annotation>, moshi: Moshi):
     JsonAdapter<*>? {
-      if (annotations.isNotEmpty()) return null
+    if (annotations.isNotEmpty()) return null
 
-      val rawType = type.rawType
-      if (rawType.isInterface) return null
-      if (rawType.isEnum) return null
-      if (!rawType.isAnnotationPresent(KOTLIN_METADATA)) return null
-      if (Util.isPlatformType(rawType)) return null
-      try {
-        val generatedAdapter = generatedAdapter(moshi, type, rawType)
-        if (generatedAdapter != null) {
-          return generatedAdapter
-        }
-      } catch (e: RuntimeException) {
-        if (e.cause !is ClassNotFoundException) {
-          throw e
-        }
-        // Fall back to a reflective adapter when the generated adapter is not found.
+    val rawType = type.rawType
+    if (rawType.isInterface) return null
+    if (rawType.isEnum) return null
+    if (!rawType.isAnnotationPresent(KOTLIN_METADATA)) return null
+    if (Util.isPlatformType(rawType)) return null
+    try {
+      val generatedAdapter = generatedAdapter(moshi, type, rawType)
+      if (generatedAdapter != null) {
+        return generatedAdapter
       }
-
-      require(!rawType.isLocalClass) {
-        "Cannot serialize local class or object expression ${rawType.name}"
+    } catch (e: RuntimeException) {
+      if (e.cause !is ClassNotFoundException) {
+        throw e
       }
-      val rawTypeKotlin = rawType.kotlin
-      require(!rawTypeKotlin.isAbstract) {
-        "Cannot serialize abstract class ${rawType.name}"
-      }
-      require(!rawTypeKotlin.isInner) {
-        "Cannot serialize inner class ${rawType.name}"
-      }
-      require(rawTypeKotlin.objectInstance == null) {
-        "Cannot serialize object declaration ${rawType.name}"
-      }
-      require(!rawTypeKotlin.isSealed) {
-        "Cannot reflectively serialize sealed class ${rawType.name}. Please register an adapter."
-      }
-
-      val constructor = rawTypeKotlin.primaryConstructor ?: return null
-      val parametersByName = constructor.parameters.associateBy { it.name }
-      constructor.isAccessible = true
-
-      val bindingsByName = LinkedHashMap<String, KotlinJsonAdapter.Binding<Any, Any?>>()
-
-      for (property in rawTypeKotlin.memberProperties) {
-        val parameter = parametersByName[property.name]
-
-        if (Modifier.isTransient(property.javaField?.modifiers ?: 0)) {
-          require(parameter == null || parameter.isOptional) {
-            "No default value for transient constructor $parameter"
-          }
-          continue
-        }
-
-        require(parameter == null || parameter.type == property.returnType) {
-          "'${property.name}' has a constructor parameter of type ${parameter!!.type} but a property of type ${property.returnType}."
-        }
-
-        if (property !is KMutableProperty1 && parameter == null) continue
-
-        property.isAccessible = true
-        val allAnnotations = property.annotations.toMutableList()
-        var jsonAnnotation = property.findAnnotation<Json>()
-
-        if (parameter != null) {
-          allAnnotations += parameter.annotations
-          if (jsonAnnotation == null) {
-            jsonAnnotation = parameter.findAnnotation()
-          }
-        }
-
-        val name = jsonAnnotation?.name ?: property.name
-        val resolvedPropertyType = resolve(type, rawType, property.returnType.javaType)
-        val adapter = moshi.adapter<Any>(
-          resolvedPropertyType,
-          Util.jsonAnnotations(allAnnotations.toTypedArray()),
-          property.name
-        )
-
-        @Suppress("UNCHECKED_CAST")
-        bindingsByName[property.name] = KotlinJsonAdapter.Binding(
-          name,
-          jsonAnnotation?.name ?: name,
-          adapter,
-          property as KProperty1<Any, Any?>,
-          parameter,
-          parameter?.index ?: -1
-        )
-      }
-
-      val bindings = ArrayList<KotlinJsonAdapter.Binding<Any, Any?>?>()
-
-      for (parameter in constructor.parameters) {
-        val binding = bindingsByName.remove(parameter.name)
-        require(binding != null || parameter.isOptional) {
-          "No property for required constructor $parameter"
-        }
-        bindings += binding
-      }
-
-      var index = bindings.size
-      for (bindingByName in bindingsByName) {
-        bindings += bindingByName.value.copy(propertyIndex = index++)
-      }
-
-      val nonTransientBindings = bindings.filterNotNull()
-      val options = JsonReader.Options.of(*nonTransientBindings.map { it.name }.toTypedArray())
-      return KotlinJsonAdapter(constructor, bindings, nonTransientBindings, options).nullSafe()
+      // Fall back to a reflective adapter when the generated adapter is not found.
     }
+
+    require(!rawType.isLocalClass) {
+      "Cannot serialize local class or object expression ${rawType.name}"
+    }
+    val rawTypeKotlin = rawType.kotlin
+    require(!rawTypeKotlin.isAbstract) {
+      "Cannot serialize abstract class ${rawType.name}"
+    }
+    require(!rawTypeKotlin.isInner) {
+      "Cannot serialize inner class ${rawType.name}"
+    }
+    require(rawTypeKotlin.objectInstance == null) {
+      "Cannot serialize object declaration ${rawType.name}"
+    }
+    require(!rawTypeKotlin.isSealed) {
+      "Cannot reflectively serialize sealed class ${rawType.name}. Please register an adapter."
+    }
+
+    val constructor = rawTypeKotlin.primaryConstructor ?: return null
+    val parametersByName = constructor.parameters.associateBy { it.name }
+    constructor.isAccessible = true
+
+    val bindingsByName = LinkedHashMap<String, KotlinJsonAdapter.Binding<Any, Any?>>()
+
+    for (property in rawTypeKotlin.memberProperties) {
+      val parameter = parametersByName[property.name]
+
+      if (Modifier.isTransient(property.javaField?.modifiers ?: 0)) {
+        require(parameter == null || parameter.isOptional) {
+          "No default value for transient constructor $parameter"
+        }
+        continue
+      }
+
+      require(parameter == null || parameter.type == property.returnType) {
+        "'${property.name}' has a constructor parameter of type ${parameter!!.type} but a property of type ${property.returnType}."
+      }
+
+      if (property !is KMutableProperty1 && parameter == null) continue
+
+      property.isAccessible = true
+      val allAnnotations = property.annotations.toMutableList()
+      var jsonAnnotation = property.findAnnotation<Json>()
+
+      if (parameter != null) {
+        allAnnotations += parameter.annotations
+        if (jsonAnnotation == null) {
+          jsonAnnotation = parameter.findAnnotation()
+        }
+      }
+
+      val name = jsonAnnotation?.name ?: property.name
+      val resolvedPropertyType = resolve(type, rawType, property.returnType.javaType)
+      val adapter = moshi.adapter<Any>(
+        resolvedPropertyType,
+        Util.jsonAnnotations(allAnnotations.toTypedArray()),
+        property.name
+      )
+
+      @Suppress("UNCHECKED_CAST")
+      bindingsByName[property.name] = KotlinJsonAdapter.Binding(
+        name,
+        jsonAnnotation?.name ?: name,
+        adapter,
+        property as KProperty1<Any, Any?>,
+        parameter,
+        parameter?.index ?: -1
+      )
+    }
+
+    val bindings = ArrayList<KotlinJsonAdapter.Binding<Any, Any?>?>()
+
+    for (parameter in constructor.parameters) {
+      val binding = bindingsByName.remove(parameter.name)
+      require(binding != null || parameter.isOptional) {
+        "No property for required constructor $parameter"
+      }
+      bindings += binding
+    }
+
+    var index = bindings.size
+    for (bindingByName in bindingsByName) {
+      bindings += bindingByName.value.copy(propertyIndex = index++)
+    }
+
+    val nonTransientBindings = bindings.filterNotNull()
+    val options = JsonReader.Options.of(*nonTransientBindings.map { it.name }.toTypedArray())
+    return KotlinJsonAdapter(constructor, bindings, nonTransientBindings, options).nullSafe()
+  }
 }

kotlin/tests/build.gradle.kts

@@ -26,8 +26,7 @@ tasks.withType<KotlinCompile>().configureEach {
     @Suppress("SuspiciousCollectionReassignment")
     freeCompilerArgs += listOf(
       "-Werror",
-      "-Xopt-in=kotlin.ExperimentalStdlibApi",
-      "-Xinline-classes"
+      "-Xopt-in=kotlin.ExperimentalStdlibApi"
     )
   }
 }

kotlin/tests/src/test/kotlin/com/squareup/moshi/kotlin/DualKotlinTest.kt

@@ -285,9 +285,9 @@ class DualKotlinTest(useReflection: Boolean) {
   }
 
   @Test fun inlineClass() {
-    val adapter = moshi.adapter<InlineClass>()
+    val adapter = moshi.adapter<ValueClass>()
 
-    val inline = InlineClass(5)
+    val inline = ValueClass(5)
 
     val expectedJson =
       """{"i":5}"""
@@ -300,12 +300,12 @@ class DualKotlinTest(useReflection: Boolean) {
   }
 
   @JsonClass(generateAdapter = true)
-  data class InlineConsumer(val inline: InlineClass)
+  data class InlineConsumer(val inline: ValueClass)
 
   @Test fun inlineClassConsumer() {
     val adapter = moshi.adapter<InlineConsumer>()
 
-    val consumer = InlineConsumer(InlineClass(23))
+    val consumer = InlineConsumer(ValueClass(23))
 
     @Language("JSON")
     val expectedJson =
@@ -622,9 +622,10 @@ typealias GenericTypeAlias = List<out GenericClass<in TypeAlias>?>?
 @JsonClass(generateAdapter = true)
 data class GenericClass<T>(val value: T)
 
-// Has to be outside since inline classes are only allowed on top level
+// Has to be outside since value classes are only allowed on top level
+@JvmInline
 @JsonClass(generateAdapter = true)
-inline class InlineClass(val i: Int)
+value class ValueClass(val i: Int)
 
 typealias A = Int
 typealias NullableA = A?

kotlin/tests/src/test/kotlin/com/squareup/moshi/kotlin/codegen/GeneratedAdaptersTest.kt

@@ -1191,11 +1191,14 @@ class GeneratedAdaptersTest {
   annotation class Uppercase(val inFrench: Boolean, val onSundays: Boolean = false)
 
   class UppercaseJsonAdapter {
-    @ToJson fun toJson(@Uppercase(inFrench = true) s: String): String {
-      return s.toUpperCase(Locale.US)
+    @ToJson
+    fun toJson(@Uppercase(inFrench = true) s: String): String {
+      return s.uppercase(Locale.US)
     }
-    @FromJson @Uppercase(inFrench = true) fun fromJson(s: String): String {
-      return s.toLowerCase(Locale.US)
+    @FromJson
+    @Uppercase(inFrench = true)
+    fun fromJson(s: String): String {
+      return s.lowercase(Locale.US)
     }
   }
 

kotlin/tests/src/test/kotlin/com/squareup/moshi/kotlin/codegen/annotation/UppercaseInAnnotationPackage.kt

@@ -24,10 +24,13 @@ import java.util.Locale
 annotation class UppercaseInAnnotationPackage
 
 class UppercaseInAnnotationPackageJsonAdapter {
-  @ToJson fun toJson(@UppercaseInAnnotationPackage s: String): String {
-    return s.toUpperCase(Locale.US)
+  @ToJson
+  fun toJson(@UppercaseInAnnotationPackage s: String): String {
+    return s.uppercase(Locale.US)
   }
-  @FromJson @UppercaseInAnnotationPackage fun fromJson(s: String): String {
-    return s.toLowerCase(Locale.US)
+  @FromJson
+  @UppercaseInAnnotationPackage
+  fun fromJson(s: String): String {
+    return s.lowercase(Locale.US)
   }
 }

kotlin/tests/src/test/kotlin/com/squareup/moshi/kotlin/reflect/KotlinJsonAdapterTest.kt

@@ -916,11 +916,14 @@ class KotlinJsonAdapterTest {
   annotation class Uppercase
 
   class UppercaseJsonAdapter {
-    @ToJson fun toJson(@Uppercase s: String): String {
-      return s.toUpperCase(Locale.US)
+    @ToJson
+    fun toJson(@Uppercase s: String): String {
+      return s.uppercase(Locale.US)
     }
-    @FromJson @Uppercase fun fromJson(s: String): String {
-      return s.toLowerCase(Locale.US)
+    @FromJson
+    @Uppercase
+    fun fromJson(s: String): String {
+      return s.lowercase(Locale.US)
     }
   }
 

moshi/build.gradle.kts

@@ -23,11 +23,14 @@ plugins {
 }
 
 tasks.withType<KotlinCompile>()
-  .matching { it.name.contains("test", true) }
   .configureEach {
     kotlinOptions {
-      @Suppress("SuspiciousCollectionReassignment") // It's not suspicious
-      freeCompilerArgs += listOf("-Xopt-in=kotlin.ExperimentalStdlibApi")
+      jvmTarget = "1.6"
+
+      if (name.contains("test", true)) {
+        @Suppress("SuspiciousCollectionReassignment") // It's not suspicious
+        freeCompilerArgs += listOf("-Xopt-in=kotlin.ExperimentalStdlibApi")
+      }
     }
   }