0.9 release

CHANGELOG.md

@@ -14,6 +14,22 @@
 
 ### Security
 
+## 0.9.0 - 2024-06-04
+
+### Added
+
+- Custom CoroutineContext during `Context` creation.
+
+### Changed
+
+- Kotlin 2.0
+- `MetaSpec` renamed to `MetaReader`. MetaSpec is now reserved for builder-based generation of meta descriptors.
+- Add self-type for Meta. Remove unsafe cast method for meta instances.
+
+### Removed
+
+- Automatic descriptors for schema. It is not possible to implement them without heavy reflection.
+
 ## 0.8.2 - 2024-04-27
 
 ### Added

build.gradle.kts

@@ -3,21 +3,21 @@ import space.kscience.gradle.useApache2Licence
 import space.kscience.gradle.useSPCTeam
 
 plugins {
-    id("space.kscience.gradle.project")
+    alias(spclibs.plugins.kscience.project)
-    id("org.jetbrains.kotlinx.kover") version "0.7.6"
+    alias(spclibs.plugins.kotlinx.kover)
 }
 
 allprojects {
     group = "space.kscience"
-    version = "0.8.2"
+    version = "0.9.0"
 }
 
 subprojects {
     apply(plugin = "maven-publish")
 
     tasks.withType<KotlinCompile> {
-        kotlinOptions {
+        compilerOptions {
-            freeCompilerArgs = freeCompilerArgs + "-Xcontext-receivers"
+            freeCompilerArgs.add("-Xcontext-receivers")
         }
     }
 }

dataforge-context/README.md

@@ -6,7 +6,7 @@ Context and provider definitions
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-context:0.8.2`.
+The Maven coordinates of this project are `space.kscience:dataforge-context:0.9.0-dev-1`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
@@ -16,6 +16,6 @@ repositories {
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-context:0.8.2")
+    implementation("space.kscience:dataforge-context:0.9.0-dev-1")
 }
 ```

dataforge-context/api/dataforge-context.api

@@ -57,6 +57,7 @@ public abstract interface class space/kscience/dataforge/context/ContextAware {
 
 public final class space/kscience/dataforge/context/ContextBuilder {
 	public final fun build ()Lspace/kscience/dataforge/context/Context;
+	public final fun coroutineContext (Lkotlin/coroutines/CoroutineContext;)V
 	public final fun getName ()Lspace/kscience/dataforge/names/Name;
 	public final fun plugin (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Lkotlin/jvm/functions/Function1;)V
 	public final fun plugin (Lspace/kscience/dataforge/context/Plugin;)V
@@ -69,9 +70,6 @@ public final class space/kscience/dataforge/context/ContextBuilder {
 	public final fun properties (Lkotlin/jvm/functions/Function1;)V
 }
 
-public final class space/kscience/dataforge/context/ContextBuilderKt {
-}
-
 public final class space/kscience/dataforge/context/DefaultLogManager : space/kscience/dataforge/context/AbstractPlugin, space/kscience/dataforge/context/LogManager {
 	public static final field Companion Lspace/kscience/dataforge/context/DefaultLogManager$Companion;
 	public fun <init> ()V
@@ -212,14 +210,14 @@ public final class space/kscience/dataforge/context/PluginTag : space/kscience/d
 	public fun toString ()Ljava/lang/String;
 }
 
-public final class space/kscience/dataforge/context/PluginTag$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+public synthetic class space/kscience/dataforge/context/PluginTag$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
 	public static final field INSTANCE Lspace/kscience/dataforge/context/PluginTag$$serializer;
-	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public final fun childSerializers ()[Lkotlinx/serialization/KSerializer;
 	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
-	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/context/PluginTag;
+	public final fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/context/PluginTag;
-	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public final fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
 	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
-	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/context/PluginTag;)V
+	public final fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/context/PluginTag;)V
 	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
 }
 
@@ -264,15 +262,6 @@ public abstract interface annotation class space/kscience/dataforge/descriptors/
 public abstract interface annotation class space/kscience/dataforge/descriptors/Multiple : java/lang/annotation/Annotation {
 }
 
-public final class space/kscience/dataforge/descriptors/ReflectiveDescriptorsKt {
-}
-
-public final class space/kscience/dataforge/properties/MetaAsFlowKt {
-}
-
-public final class space/kscience/dataforge/provider/DfTypeKt {
-}
-
 public final class space/kscience/dataforge/provider/Path : java/lang/Iterable, kotlin/jvm/internal/markers/KMappedMarker {
 	public static final field Companion Lspace/kscience/dataforge/provider/Path$Companion;
 	public static final field PATH_SEGMENT_SEPARATOR Ljava/lang/String;

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/Context.kt

@@ -10,6 +10,7 @@ import space.kscience.dataforge.misc.ThreadSafe
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.provider.Provider
 import kotlin.coroutines.CoroutineContext
+import kotlin.coroutines.EmptyCoroutineContext
 
 /**
  * The local environment for anything being done in DataForge framework. Contexts are organized into tree structure with [Global] at the top.
@@ -26,6 +27,7 @@ public open class Context internal constructor(
     public val parent: Context?,
     plugins: Set<Plugin>, // set of unattached plugins
     meta: Meta,
+    coroutineContext: CoroutineContext = EmptyCoroutineContext,
 ) : Named, MetaRepr, Provider, CoroutineScope {
 
     /**
@@ -65,7 +67,7 @@ public open class Context internal constructor(
 
     override val coroutineContext: CoroutineContext by lazy {
         (parent ?: Global).coroutineContext.let { parenContext ->
-            parenContext + SupervisorJob(parenContext[Job])
+            parenContext + coroutineContext + SupervisorJob(parenContext[Job])
         }
     }
 

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/context/ContextBuilder.kt

@@ -13,6 +13,8 @@ import space.kscience.dataforge.names.plus
 import kotlin.collections.component1
 import kotlin.collections.component2
 import kotlin.collections.set
+import kotlin.coroutines.CoroutineContext
+import kotlin.coroutines.EmptyCoroutineContext
 
 /**
  * A convenience builder for context
@@ -59,8 +61,15 @@ public class ContextBuilder internal constructor(
         plugin(DeFactoPluginFactory(plugin))
     }
 
+    private var coroutineContext: CoroutineContext = EmptyCoroutineContext
+
+    public fun coroutineContext(coroutineContext: CoroutineContext) {
+        this.coroutineContext = coroutineContext
+    }
+
+
     public fun build(): Context {
-        val contextName = name ?: NameToken("@auto",hashCode().toUInt().toString(16)).asName()
+        val contextName = name ?: NameToken("@auto", hashCode().toUInt().toString(16)).asName()
         val plugins = HashMap<PluginTag, Plugin>()
 
         fun addPlugin(factory: PluginFactory<*>, meta: Meta) {
@@ -86,7 +95,7 @@ public class ContextBuilder internal constructor(
             addPlugin(factory, meta)
         }
 
-        return Context(contextName, parent, plugins.values.toSet(), meta.seal())
+        return Context(contextName, parent, plugins.values.toSet(), meta.seal(), coroutineContext)
     }
 }
 

dataforge-context/src/commonMain/kotlin/space/kscience/dataforge/properties/metaAsFlow.kt

@@ -10,7 +10,7 @@ import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.misc.DFExperimental
 
 @DFExperimental
-public fun <T> ObservableMeta.asFlow(converter: MetaSpec<T>): Flow<T> = callbackFlow {
+public fun <T> ObservableMeta.asFlow(converter: MetaReader<T>): Flow<T> = callbackFlow {
     onChange(this){
         trySend(converter.read(this))
     }

dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/descriptors/reflectiveDescriptors.kt

@@ -4,18 +4,12 @@ import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.decodeFromStream
 import org.slf4j.LoggerFactory
-import space.kscience.dataforge.meta.Scheme
-import space.kscience.dataforge.meta.SchemeSpec
-import space.kscience.dataforge.meta.ValueType
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.descriptors.MetaDescriptorBuilder
-import space.kscience.dataforge.meta.descriptors.node
 import space.kscience.dataforge.misc.DFExperimental
 import java.net.URL
-import kotlin.reflect.KClass
+import kotlin.reflect.KAnnotatedElement
-import kotlin.reflect.full.isSubclassOf
+import kotlin.reflect.KProperty
-import kotlin.reflect.full.memberProperties
-
 
 /**
  * Description text for meta property, node or whole object
@@ -59,18 +53,8 @@ private fun MetaDescriptorBuilder.loadDescriptorFromResource(resource: Descripto
 }
 
 @DFExperimental
-public fun MetaDescriptor.Companion.forClass(
+public fun MetaDescriptorBuilder.forAnnotatedElement(element: KAnnotatedElement) {
-    kClass: KClass<out Any>,
+    element.annotations.forEach {
-    mod: MetaDescriptorBuilder.() -> Unit = {},
-): MetaDescriptor = MetaDescriptor {
-    when {
-        kClass.isSubclassOf(Number::class) -> valueType(ValueType.NUMBER)
-        kClass == String::class -> ValueType.STRING
-        kClass == Boolean::class -> ValueType.BOOLEAN
-        kClass == DoubleArray::class -> ValueType.LIST
-    }
-
-    kClass.annotations.forEach {
         when (it) {
             is Description -> description = it.value
 
@@ -79,47 +63,70 @@ public fun MetaDescriptor.Companion.forClass(
             is DescriptorUrl -> loadDescriptorFromUrl(URL(it.url))
         }
     }
-    kClass.memberProperties.forEach { property ->
-
-        var flag = false
-
-        val descriptor = MetaDescriptor {
-            //use base type descriptor as a base
-            (property.returnType.classifier as? KClass<*>)?.let {
-                from(forClass(it))
-            }
-
-            property.annotations.forEach {
-                when (it) {
-                    is Description -> {
-                        description = it.value
-                        flag = true
-                    }
-
-                    is Multiple -> {
-                        multiple = true
-                        flag = true
-                    }
-
-                    is DescriptorResource -> {
-                        loadDescriptorFromResource(it)
-                        flag = true
-                    }
-
-                    is DescriptorUrl -> {
-                        loadDescriptorFromUrl(URL(it.url))
-                        flag = true
-                    }
-                }
-            }
-        }
-        if (flag) {
-            node(property.name, descriptor)
-        }
-    }
-    mod()
 }
 
 @DFExperimental
-public inline fun <reified T : Scheme> SchemeSpec<T>.autoDescriptor(noinline mod: MetaDescriptorBuilder.() -> Unit = {}): MetaDescriptor =
+public fun MetaDescriptorBuilder.forProperty(property: KProperty<*>) {
-    MetaDescriptor.forClass(T::class, mod)
+    property.annotations.forEach {
+        when (it) {
+            is Description -> description = it.value
+
+            is DescriptorResource -> loadDescriptorFromResource(it)
+
+            is DescriptorUrl -> loadDescriptorFromUrl(URL(it.url))
+        }
+    }
+}
+//
+//@DFExperimental
+//public fun <T : Scheme> MetaDescriptor.Companion.forScheme(
+//    spec: SchemeSpec<T>,
+//    mod: MetaDescriptorBuilder.() -> Unit = {},
+//): MetaDescriptor = MetaDescriptor {
+//    val scheme = spec.empty()
+//    val kClass: KClass<T> = scheme::class as KClass<T>
+//    when {
+//        kClass.isSubclassOf(Number::class) -> valueType(ValueType.NUMBER)
+//        kClass == String::class -> ValueType.STRING
+//        kClass == Boolean::class -> ValueType.BOOLEAN
+//        kClass == DoubleArray::class -> ValueType.LIST
+//        kClass == ByteArray::class -> ValueType.LIST
+//    }
+//
+//    forAnnotatedElement(kClass)
+//    kClass.memberProperties.forEach { property ->
+//        node(property.name) {
+//
+//            (property.getDelegate(scheme) as? MetaDelegate<*>)?.descriptor?.let {
+//                from(it)
+//            }
+//
+//            property.annotations.forEach {
+//                when (it) {
+//                    is Description -> {
+//                        description = it.value
+//                    }
+//
+//                    is Multiple -> {
+//                        multiple = true
+//                    }
+//
+//                    is DescriptorResource -> {
+//                        loadDescriptorFromResource(it)
+//                    }
+//
+//                    is DescriptorUrl -> {
+//                        loadDescriptorFromUrl(URL(it.url))
+//                    }
+//                }
+//            }
+//        }
+//
+//    }
+//    mod()
+//}
+//
+//@DFExperimental
+//public inline fun <reified T : Scheme> SchemeSpec<T>.autoDescriptor(
+//    noinline mod: MetaDescriptorBuilder.() -> Unit = {},
+//): MetaDescriptor = MetaDescriptor.forScheme(this, mod)

dataforge-context/src/jvmTest/kotlin/space/kscience/dataforge/descriptors/TestAutoDescriptors.kt

@@ -2,35 +2,28 @@
 
 package space.kscience.dataforge.descriptors
 
-import kotlinx.serialization.encodeToString
-import kotlinx.serialization.json.Json
-import org.junit.jupiter.api.Test
-import space.kscience.dataforge.meta.Scheme
-import space.kscience.dataforge.meta.SchemeSpec
-import space.kscience.dataforge.meta.descriptors.MetaDescriptor
-import space.kscience.dataforge.meta.int
-import space.kscience.dataforge.meta.string
 import space.kscience.dataforge.misc.DFExperimental
 
-private class TestScheme : Scheme() {
+//
-
+//class TestScheme : Scheme() {
-    @Description("A")
+//
-    val a by string()
+//    @Description("A")
-
+//    val a by string()
-    @Description("B")
+//
-    val b by int()
+//    @Description("B")
-
+//    val b by int()
-    val c by int()
+//
-
+//    val c by int()
-    companion object : SchemeSpec<TestScheme>(::TestScheme) {
+//
-        override val descriptor: MetaDescriptor = autoDescriptor()
+//    companion object : SchemeSpec<TestScheme>(::TestScheme) {
-    }
+//        override val descriptor: MetaDescriptor = autoDescriptor()
-}
+//    }
-
+//}
-class TestAutoDescriptors {
+//
-    @Test
+//class TestAutoDescriptors {
-    fun autoDescriptor() {
+//    @Test
-        val autoDescriptor = MetaDescriptor.forClass(TestScheme::class)
+//    fun autoDescriptor() {
-        println(Json { prettyPrint = true }.encodeToString(autoDescriptor))
+//        val autoDescriptor = MetaDescriptor.forScheme(TestScheme)
-    }
+//        println(Json { prettyPrint = true }.encodeToString(autoDescriptor))
-}
+//    }
+//}

dataforge-data/README.md

@@ -6,7 +6,7 @@
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-data:0.8.2`.
+The Maven coordinates of this project are `space.kscience:dataforge-data:0.9.0-dev-1`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
@@ -16,6 +16,6 @@ repositories {
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-data:0.8.2")
+    implementation("space.kscience:dataforge-data:0.9.0-dev-1")
 }
 ```

dataforge-data/src/commonMain/kotlin/space/kscience/dataforge/data/dataTransform.kt

@@ -18,6 +18,24 @@ public data class NamedValueWithMeta<T>(val name: Name, val value: T, val meta:
 public suspend fun <T> NamedData<T>.awaitWithMeta(): NamedValueWithMeta<T> =
     NamedValueWithMeta(name, await(), meta)
 
+/**
+ * Lazily transform this data to another data. By convention [block] should not use external data (be pure).
+ * @param type explicit type of the resulting [Data]
+ * @param coroutineContext additional [CoroutineContext] elements used for data computation.
+ * @param meta for the resulting data. By default equals input data.
+ * @param block the transformation itself
+ */
+@UnsafeKType
+public fun <T, R> Data<T>.transform(
+    type: KType,
+    meta: Meta = this.meta,
+    coroutineContext: CoroutineContext = EmptyCoroutineContext,
+    block: suspend (T) -> R,
+): Data<R> = Data(type, meta, coroutineContext, listOf(this)) {
+    block(await())
+}
+
+
 
 /**
  * Lazily transform this data to another data. By convention [block] should not use external data (be pure).

dataforge-data/src/jvmTest/kotlin/space/kscience/dataforge/data/ActionsTest.kt

@@ -43,6 +43,7 @@ internal class ActionsTest {
         repeat(10) {
             source.updateValue(it.toString(), it)
         }
+
         result.updates.take(10).onEach { println(it.name) }.collect()
 
         assertEquals(2, result["1"]?.await())

dataforge-io/README.md

@@ -6,7 +6,7 @@ IO module
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-io:0.8.2`.
+The Maven coordinates of this project are `space.kscience:dataforge-io:0.9.0-dev-1`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
@@ -16,6 +16,6 @@ repositories {
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-io:0.8.2")
+    implementation("space.kscience:dataforge-io:0.9.0-dev-1")
 }
 ```

dataforge-io/dataforge-io-yaml/README.md

@@ -6,7 +6,7 @@ YAML meta IO
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.8.2`.
+The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.9.0-dev-1`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
@@ -16,6 +16,6 @@ repositories {
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-io-yaml:0.8.2")
+    implementation("space.kscience:dataforge-io-yaml:0.9.0-dev-1")
 }
 ```

dataforge-meta/README.md

@@ -6,7 +6,7 @@ Meta definition and basic operations on meta
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-meta:0.8.2`.
+The Maven coordinates of this project are `space.kscience:dataforge-meta:0.9.0-dev-1`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
@@ -16,6 +16,6 @@ repositories {
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-meta:0.8.2")
+    implementation("space.kscience:dataforge-meta:0.9.0-dev-1")
 }
 ```

dataforge-meta/api/dataforge-meta.api

@@ -103,6 +103,8 @@ public final class space/kscience/dataforge/meta/Laminate : space/kscience/dataf
 	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getItems ()Ljava/util/Map;
 	public final fun getLayers ()Ljava/util/List;
+	public fun getSelf ()Lspace/kscience/dataforge/meta/Laminate;
+	public synthetic fun getSelf ()Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun hashCode ()I
 	public final fun merge ()Lspace/kscience/dataforge/meta/SealedMeta;
@@ -198,7 +200,7 @@ public final class space/kscience/dataforge/meta/MetaBuilder : space/kscience/da
 public abstract interface annotation class space/kscience/dataforge/meta/MetaBuilderMarker : java/lang/annotation/Annotation {
 }
 
-public abstract interface class space/kscience/dataforge/meta/MetaConverter : space/kscience/dataforge/meta/MetaSpec {
+public abstract interface class space/kscience/dataforge/meta/MetaConverter : space/kscience/dataforge/meta/MetaReader {
 	public static final field Companion Lspace/kscience/dataforge/meta/MetaConverter$Companion;
 	public abstract fun convert (Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Meta;
 	public fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
@@ -246,15 +248,15 @@ public final class space/kscience/dataforge/meta/MetaDelegateKt {
 	public static final fun int (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;ILspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static synthetic fun int$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static final fun listOfSpec (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun listOfSpec (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static synthetic fun listOfSpec$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun listOfSpec$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static final fun long (Lspace/kscience/dataforge/meta/MetaProvider;JLspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static final fun long (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MetaProvider;JLspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static synthetic fun long$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaSpec;)Lkotlin/properties/ReadOnlyProperty;
+	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaReader;)Lkotlin/properties/ReadOnlyProperty;
 	public static final fun node (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaSpec;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
+	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/MetaReader;ILjava/lang/Object;)Lkotlin/properties/ReadOnlyProperty;
 	public static synthetic fun node$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static final fun number (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
@@ -262,8 +264,8 @@ public final class space/kscience/dataforge/meta/MetaDelegateKt {
 	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/Number;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static synthetic fun number$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static final fun spec (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static final fun spec (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
-	public static synthetic fun spec$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
+	public static synthetic fun spec$default (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/names/Name;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaDelegate;
 	public static final fun string (Lspace/kscience/dataforge/meta/MetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lspace/kscience/dataforge/meta/MetaDelegate;
@@ -294,7 +296,6 @@ public final class space/kscience/dataforge/meta/MetaKt {
 	public static final fun getLong (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Long;
 	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/names/NameToken;)Lspace/kscience/dataforge/meta/Meta;
 	public static final fun getNumber (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Number;
-	public static final fun getSelf (Lspace/kscience/dataforge/meta/TypedMeta;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public static final fun getShort (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Short;
 	public static final fun getString (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/String;
 	public static final fun getStringList (Lspace/kscience/dataforge/meta/Meta;)Ljava/util/List;
@@ -311,6 +312,16 @@ public abstract interface class space/kscience/dataforge/meta/MetaProvider : spa
 	public fun getValue (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Value;
 }
 
+public abstract interface class space/kscience/dataforge/meta/MetaReader : space/kscience/dataforge/meta/descriptors/Described {
+	public fun read (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public abstract fun readOrNull (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+}
+
+public final class space/kscience/dataforge/meta/MetaReaderKt {
+	public static final fun readNullable (Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public static final fun readValue (Lspace/kscience/dataforge/meta/MetaReader;Lspace/kscience/dataforge/meta/Value;)Ljava/lang/Object;
+}
+
 public abstract interface class space/kscience/dataforge/meta/MetaRepr {
 	public abstract fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
 }
@@ -324,16 +335,6 @@ public final class space/kscience/dataforge/meta/MetaSerializer : kotlinx/serial
 	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/Meta;)V
 }
 
-public abstract interface class space/kscience/dataforge/meta/MetaSpec : space/kscience/dataforge/meta/descriptors/Described {
-	public fun read (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-	public abstract fun readOrNull (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-}
-
-public final class space/kscience/dataforge/meta/MetaSpecKt {
-	public static final fun readNullable (Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
-	public static final fun readValue (Lspace/kscience/dataforge/meta/MetaSpec;Lspace/kscience/dataforge/meta/Value;)Ljava/lang/Object;
-}
-
 public final class space/kscience/dataforge/meta/MetaTransformation {
 	public static final field Companion Lspace/kscience/dataforge/meta/MetaTransformation$Companion;
 	public static final fun apply-impl (Ljava/util/Collection;Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/Meta;
@@ -551,6 +552,8 @@ public abstract interface class space/kscience/dataforge/meta/ObservableMutableM
 	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
 	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public abstract fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public fun getSelf ()Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public synthetic fun getSelf ()Lspace/kscience/dataforge/meta/TypedMeta;
 }
 
 public final class space/kscience/dataforge/meta/RegexItemTransformationRule : space/kscience/dataforge/meta/TransformationRule {
@@ -624,19 +627,21 @@ public final class space/kscience/dataforge/meta/SealedMeta : space/kscience/dat
 	public fun <init> (Lspace/kscience/dataforge/meta/Value;Ljava/util/Map;)V
 	public fun equals (Ljava/lang/Object;)Z
 	public fun getItems ()Ljava/util/Map;
+	public fun getSelf ()Lspace/kscience/dataforge/meta/SealedMeta;
+	public synthetic fun getSelf ()Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun hashCode ()I
 	public fun toString ()Ljava/lang/String;
 }
 
-public final class space/kscience/dataforge/meta/SealedMeta$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+public synthetic class space/kscience/dataforge/meta/SealedMeta$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
 	public static final field INSTANCE Lspace/kscience/dataforge/meta/SealedMeta$$serializer;
-	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public final fun childSerializers ()[Lkotlinx/serialization/KSerializer;
 	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
-	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/SealedMeta;
+	public final fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/SealedMeta;
-	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public final fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
 	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
-	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/SealedMeta;)V
+	public final fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/SealedMeta;)V
 	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
 }
 
@@ -710,6 +715,7 @@ public abstract interface class space/kscience/dataforge/meta/TypedMeta : space/
 	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public abstract fun getItems ()Ljava/util/Map;
+	public abstract fun getSelf ()Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
 }
 
@@ -844,14 +850,14 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor {
 	public fun toString ()Ljava/lang/String;
 }
 
-public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
+public synthetic class space/kscience/dataforge/meta/descriptors/MetaDescriptor$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
 	public static final field INSTANCE Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor$$serializer;
-	public fun childSerializers ()[Lkotlinx/serialization/KSerializer;
+	public final fun childSerializers ()[Lkotlinx/serialization/KSerializer;
 	public synthetic fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Ljava/lang/Object;
-	public fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+	public final fun deserialize (Lkotlinx/serialization/encoding/Decoder;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
-	public fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
+	public final fun getDescriptor ()Lkotlinx/serialization/descriptors/SerialDescriptor;
 	public synthetic fun serialize (Lkotlinx/serialization/encoding/Encoder;Ljava/lang/Object;)V
-	public fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)V
+	public final fun serialize (Lkotlinx/serialization/encoding/Encoder;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)V
 	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
 }
 
@@ -876,6 +882,7 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuild
 	public final fun getMultiple ()Z
 	public final fun getValueRestriction ()Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 	public final fun getValueTypes ()Ljava/util/List;
+	public final fun node (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)V
 	public final fun setAllowedValues (Ljava/util/List;)V
 	public final fun setAttributes (Lspace/kscience/dataforge/meta/MutableMeta;)V
 	public final fun setChildren (Ljava/util/Map;)V
@@ -927,10 +934,6 @@ public final class space/kscience/dataforge/meta/descriptors/ValueRestriction$Co
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
 
-public final class space/kscience/dataforge/misc/CastJvmKt {
-	public static final fun unsafeCast (Ljava/lang/Object;)Ljava/lang/Object;
-}
-
 public abstract interface annotation class space/kscience/dataforge/misc/DFBuilder : java/lang/annotation/Annotation {
 }
 

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Laminate.kt

@@ -9,6 +9,8 @@ import space.kscience.dataforge.names.NameToken
  */
 public class Laminate internal constructor(public val layers: List<Meta>) : TypedMeta<Laminate> {
 
+    override val self: Laminate get() = this
+
     override val value: Value? = layers.firstNotNullOfOrNull { it.value }
 
     override val items: Map<NameToken, Laminate> by lazy {

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Meta.kt

@@ -3,7 +3,6 @@ package space.kscience.dataforge.meta
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
 import space.kscience.dataforge.misc.DfType
-import space.kscience.dataforge.misc.unsafeCast
 import space.kscience.dataforge.names.*
 import kotlin.jvm.JvmName
 
@@ -151,6 +150,8 @@ public interface TypedMeta<out M : TypedMeta<M>> : Meta {
 
     override val items: Map<NameToken, M>
 
+    public val self: M
+
     override fun get(name: Name): M? {
         tailrec fun M.find(name: Name): M? = if (name.isEmpty()) {
             this
@@ -164,11 +165,6 @@ public interface TypedMeta<out M : TypedMeta<M>> : Meta {
     override fun toMeta(): Meta = this
 }
 
-/**
- * Access self as a recursive type instance
- */
-public inline val <M : TypedMeta<M>> TypedMeta<M>.self: M get() = unsafeCast()
-
 //public typealias Meta = TypedMeta<*>
 
 public operator fun <M : TypedMeta<M>> TypedMeta<M>?.get(token: NameToken): M? = this?.items?.get(token)

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaConverter.kt

@@ -11,7 +11,7 @@ import space.kscience.dataforge.misc.DFExperimental
 /**
  * A converter of generic object to and from [Meta]
  */
-public interface MetaConverter<T>: MetaSpec<T> {
+public interface MetaConverter<T>: MetaReader<T> {
 
     /**
      * A descriptor for resulting meta

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaDelegate.kt

@@ -25,16 +25,16 @@ public fun MetaProvider.node(
 }
 
 /**
- * Use [metaSpec] to read the Meta node
+ * Use [metaReader] to read the Meta node
  */
 public fun <T> MetaProvider.spec(
-    metaSpec: MetaSpec<T>,
+    metaReader: MetaReader<T>,
     key: Name? = null,
 ): MetaDelegate<T?> = object : MetaDelegate<T?> {
-    override val descriptor: MetaDescriptor? get() = metaSpec.descriptor
+    override val descriptor: MetaDescriptor? get() = metaReader.descriptor
 
     override fun getValue(thisRef: Any?, property: KProperty<*>): T? {
-        return get(key ?: property.name.asName())?.let { metaSpec.read(it) }
+        return get(key ?: property.name.asName())?.let { metaReader.read(it) }
     }
 }
 
@@ -50,14 +50,14 @@ public inline fun <reified T> MetaProvider.serializable(
 @Deprecated("Use convertable", ReplaceWith("convertable(converter, key)"))
 public fun <T> MetaProvider.node(
     key: Name? = null,
-    converter: MetaSpec<T>,
+    converter: MetaReader<T>,
 ): ReadOnlyProperty<Any?, T?> = spec(converter, key)
 
 /**
  * Use [converter] to convert a list of same name siblings meta to object
  */
 public fun <T> Meta.listOfSpec(
-    converter: MetaSpec<T>,
+    converter: MetaReader<T>,
     key: Name? = null,
 ): MetaDelegate<List<T>> = object : MetaDelegate<List<T>> {
     override fun getValue(thisRef: Any?, property: KProperty<*>): List<T> {

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaReader.kt

@@ -2,7 +2,7 @@ package space.kscience.dataforge.meta
 
 import space.kscience.dataforge.meta.descriptors.Described
 
-public interface MetaSpec<out T> : Described {
+public interface MetaReader<out T> : Described {
 
     /**
      * Read the source meta into an object and return null if Meta could not be interpreted as a target type
@@ -10,12 +10,12 @@ public interface MetaSpec<out T> : Described {
     public fun readOrNull(source: Meta): T?
 
     /**
-     * Read generic read-only meta with this [MetaSpec] producing instance of the desired type.
+     * Read generic read-only meta with this [MetaReader] producing instance of the desired type.
      * Throws an error if conversion could not be done.
      */
     public fun read(source: Meta): T = readOrNull(source) ?: error("Meta $source could not be interpreted by $this")
 }
 
 
-public fun <T : Any> MetaSpec<T>.readNullable(item: Meta?): T? = item?.let { read(it) }
+public fun <T : Any> MetaReader<T>.readNullable(item: Meta?): T? = item?.let { read(it) }
-public fun <T> MetaSpec<T>.readValue(value: Value): T? = read(Meta(value))
+public fun <T> MetaReader<T>.readValue(value: Value): T? = read(Meta(value))

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MetaRef.kt

@@ -0,0 +1,64 @@
+package space.kscience.dataforge.meta
+
+import space.kscience.dataforge.meta.descriptors.Described
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import space.kscience.dataforge.meta.descriptors.MetaDescriptorBuilder
+import space.kscience.dataforge.misc.DFExperimental
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.asName
+import kotlin.properties.PropertyDelegateProvider
+import kotlin.properties.ReadOnlyProperty
+
+
+/**
+ * A reference to a read-only value of type [T] inside [MetaProvider]
+ */
+@DFExperimental
+public data class MetaRef<T>(
+    public val name: Name,
+    public val converter: MetaConverter<T>,
+    override val descriptor: MetaDescriptor? = converter.descriptor,
+) : Described
+
+@DFExperimental
+public operator fun <T> MetaProvider.get(ref: MetaRef<T>): T? = get(ref.name)?.let { ref.converter.readOrNull(it) }
+
+@DFExperimental
+public operator fun <T> MutableMetaProvider.set(ref: MetaRef<T>, value: T) {
+    set(ref.name, ref.converter.convert(value))
+}
+
+@DFExperimental
+public class MetaSpec(
+    private val configuration: MetaDescriptorBuilder.() -> Unit = {},
+) : Described {
+    private val refs: MutableList<MetaRef<*>> = mutableListOf()
+
+    private fun registerRef(ref: MetaRef<*>) {
+        refs.add(ref)
+    }
+
+    public fun <T> item(
+        converter: MetaConverter<T>,
+        descriptor: MetaDescriptor? = converter.descriptor,
+        key: Name? = null,
+    ): PropertyDelegateProvider<MetaSpec, ReadOnlyProperty<MetaSpec, MetaRef<T>>> =
+        PropertyDelegateProvider { _, property ->
+            val ref = MetaRef(key ?: property.name.asName(), converter, descriptor)
+            registerRef(ref)
+            ReadOnlyProperty { _, _ ->
+                ref
+            }
+        }
+
+    override val descriptor: MetaDescriptor by lazy {
+        MetaDescriptor {
+            refs.forEach { ref ->
+                ref.descriptor?.let {
+                    node(ref.name, ref.descriptor)
+                }
+            }
+            configuration()
+        }
+    }
+}

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/MutableMeta.kt

@@ -253,6 +253,9 @@ private class MutableMetaImpl(
     value: Value?,
     children: Map<NameToken, Meta> = emptyMap(),
 ) : AbstractObservableMeta(), ObservableMutableMeta {
+
+    override val self get() = this
+
     override var value = value
         @ThreadSafe set(value) {
             val oldValue = field

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMeta.kt

@@ -39,6 +39,9 @@ public interface ObservableMeta : Meta {
  * A [Meta] which is both observable and mutable
  */
 public interface ObservableMutableMeta : ObservableMeta, MutableMeta, MutableTypedMeta<ObservableMutableMeta> {
+
+    override val self: ObservableMutableMeta get() = this
+
     override fun getOrCreate(name: Name): ObservableMutableMeta
 
     override fun get(name: Name): ObservableMutableMeta? {

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/ObservableMetaWrapper.kt

@@ -14,6 +14,9 @@ private class ObservableMetaWrapper(
     val nodeName: Name,
     val listeners: MutableSet<MetaListener>,
 ) : ObservableMutableMeta {
+
+    override val self get() = this
+
     override val items: Map<NameToken, ObservableMutableMeta>
         get() = root[nodeName]?.items?.keys?.associateWith {
             ObservableMetaWrapper(root, nodeName + it, listeners)

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/Scheme.kt

@@ -12,7 +12,7 @@ import kotlin.reflect.KProperty
 import kotlin.reflect.KProperty1
 
 /**
- * A base for delegate-based or descriptor-based scheme. [Scheme] has an empty constructor to simplify usage from [MetaSpec].
+ * A base for delegate-based or descriptor-based scheme. [Scheme] has an empty constructor to simplify usage from [MetaReader].
  *
  * @param prototype default values provided by this scheme
  */
@@ -80,6 +80,9 @@ public open class Scheme(
     override fun toString(): String = meta.toString()
 
     private inner class SchemeMeta(val pathName: Name) : ObservableMutableMeta {
+
+        override val self get() = this
+
         override var value: Value?
             get() = target[pathName]?.value
                 ?: prototype?.get(pathName)?.value
@@ -216,7 +219,7 @@ public fun <T : Scheme> Configurable.updateWith(
 
 
 /**
- * A delegate that uses a [MetaSpec] to wrap a child of this provider
+ * A delegate that uses a [MetaReader] to wrap a child of this provider
  */
 public fun <T : Scheme> MutableMeta.scheme(
     spec: SchemeSpec<T>,
@@ -239,7 +242,7 @@ public fun <T : Scheme> Scheme.scheme(
 ): ReadWriteProperty<Any?, T> = meta.scheme(spec, key)
 
 /**
- * A delegate that uses a [MetaSpec] to wrap a child of this provider.
+ * A delegate that uses a [MetaReader] to wrap a child of this provider.
  * Returns null if meta with given name does not exist.
  */
 public fun <T : Scheme> MutableMeta.schemeOrNull(
@@ -264,7 +267,7 @@ public fun <T : Scheme> Scheme.schemeOrNull(
 ): ReadWriteProperty<Any?, T?> = meta.schemeOrNull(spec, key)
 
 /**
- * A delegate that uses a [MetaSpec] to wrap a list of child providers.
+ * A delegate that uses a [MetaReader] to wrap a list of child providers.
  * If children are mutable, the changes in list elements are reflected on them.
  * The list is a snapshot of children state, so change in structure is not reflected on its composition.
  */

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/SealedMeta.kt

@@ -13,6 +13,9 @@ public class SealedMeta(
     override val value: Value?,
     override val items: Map<NameToken, SealedMeta>,
 ) : TypedMeta<SealedMeta> {
+
+    override val self: SealedMeta get() = this
+
     override fun toString(): String = Meta.toString(this)
     override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
 

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder.kt

@@ -58,7 +58,7 @@ public class MetaDescriptorBuilder @PublishedApi internal constructor() {
         }
     }
 
-    internal fun node(
+    public fun node(
         name: Name,
         descriptorBuilder: MetaDescriptor,
     ): Unit {

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/misc/cast.kt

@@ -1,3 +0,0 @@
-package space.kscience.dataforge.misc
-
-public expect inline fun <T> Any?.unsafeCast(): T

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/names/Name.kt

@@ -58,7 +58,7 @@ public class Name(public val tokens: List<NameToken>) {
          */
         public fun parse(string: String): Name {
             if (string.isBlank()) return EMPTY
-            val tokens = sequence {
+            val tokens = buildList<NameToken> {
                 var bodyBuilder = StringBuilder()
                 var queryBuilder = StringBuilder()
                 var bracketCount = 0
@@ -91,7 +91,7 @@ public class Name(public val tokens: List<NameToken>) {
                         else -> when (it) {
                             '.' -> {
                                 val query = if (queryBuilder.isEmpty()) null else queryBuilder.toString()
-                                yield(NameToken(bodyBuilder.toString(), query))
+                                add(NameToken(bodyBuilder.toString(), query))
                                 bodyBuilder = StringBuilder()
                                 queryBuilder = StringBuilder()
                             }
@@ -106,9 +106,9 @@ public class Name(public val tokens: List<NameToken>) {
                     }
                 }
                 val query = if (queryBuilder.isEmpty()) null else queryBuilder.toString()
-                yield(NameToken(bodyBuilder.toString(), query))
+                add(NameToken(bodyBuilder.toString(), query))
             }
-            return Name(tokens.toList())
+            return Name(tokens)
         }
     }
 }

dataforge-meta/src/jsMain/kotlin/space/kscience/dataforge/meta/DynamicMeta.kt

@@ -31,6 +31,9 @@ public fun Meta.toDynamic(): dynamic {
 }
 
 public class DynamicMeta(internal val obj: dynamic) : TypedMeta<DynamicMeta> {
+
+    override val self: DynamicMeta get() = this
+
     private fun keys(): Array<String> = js("Object").keys(obj) as Array<String>
 
     private fun isArray(obj: dynamic): Boolean =

dataforge-meta/src/jsMain/kotlin/space/kscience/dataforge/misc/castJs.kt

@@ -1,5 +0,0 @@
-package space.kscience.dataforge.misc
-import kotlin.js.unsafeCast as unsafeCastJs
-
-@Suppress("NOTHING_TO_INLINE")
-public actual inline fun <T> Any?.unsafeCast(): T = unsafeCastJs<T>()

dataforge-meta/src/jvmMain/kotlin/space/kscience/dataforge/misc/castJvm.kt

@@ -1,4 +0,0 @@
-package space.kscience.dataforge.misc
-
-@Suppress("UNCHECKED_CAST", "NOTHING_TO_INLINE")
-public actual inline fun <T> Any?.unsafeCast(): T = this as T

dataforge-meta/src/nativeMain/kotlin/space/kscience/dataforge/misc/castNative.kt

@@ -1,4 +0,0 @@
-package space.kscience.dataforge.misc
-
-@Suppress("UNCHECKED_CAST")
-public actual inline fun <T> Any?.unsafeCast(): T = this as T

dataforge-meta/src/wasmJsMain/kotlin/space/kscience/dataforge/misc/castWasm.kt

@@ -1,4 +0,0 @@
-package space.kscience.dataforge.misc
-
-@Suppress("UNCHECKED_CAST", "NOTHING_TO_INLINE")
-public actual inline fun <T> Any?.unsafeCast(): T = this as T

dataforge-scripting/README.md

@@ -6,7 +6,7 @@
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.8.2`.
+The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.9.0-dev-1`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
@@ -16,6 +16,6 @@ repositories {
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-scripting:0.8.2")
+    implementation("space.kscience:dataforge-scripting:0.9.0-dev-1")
 }
 ```

dataforge-workspace/README.md

@@ -6,7 +6,7 @@
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.8.2`.
+The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.9.0-dev-1`.
 
 **Gradle Kotlin DSL:**
 ```kotlin
@@ -16,6 +16,6 @@ repositories {
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-workspace:0.8.2")
+    implementation("space.kscience:dataforge-workspace:0.9.0-dev-1")
 }
 ```

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/Task.kt

@@ -5,8 +5,8 @@ import space.kscience.dataforge.data.DataSink
 import space.kscience.dataforge.data.GoalExecutionRestriction
 import space.kscience.dataforge.data.MutableDataTree
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.MetaReader
 import space.kscience.dataforge.meta.MetaRepr
-import space.kscience.dataforge.meta.MetaSpec
 import space.kscience.dataforge.meta.descriptors.Described
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.misc.DfType
@@ -44,10 +44,10 @@ public interface Task<T> : Described {
 }
 
 /**
- * A [Task] with [MetaSpec] for wrapping and unwrapping task configuration
+ * A [Task] with [MetaReader] for wrapping and unwrapping task configuration
  */
 public interface TaskWithSpec<T, C : Any> : Task<T> {
-    public val spec: MetaSpec<C>
+    public val spec: MetaReader<C>
     override val descriptor: MetaDescriptor? get() = spec.descriptor
 
     public suspend fun execute(workspace: Workspace, taskName: Name, configuration: C): TaskResult<T>
@@ -122,10 +122,10 @@ public inline fun <reified T : Any> Task(
 @Suppress("FunctionName")
 public fun <T : Any, C : MetaRepr> Task(
     resultType: KType,
-    specification: MetaSpec<C>,
+    specification: MetaReader<C>,
     builder: suspend TaskResultBuilder<T>.(C) -> Unit,
 ): TaskWithSpec<T, C> = object : TaskWithSpec<T, C> {
-    override val spec: MetaSpec<C> = specification
+    override val spec: MetaReader<C> = specification
 
     override suspend fun execute(
         workspace: Workspace,
@@ -143,6 +143,6 @@ public fun <T : Any, C : MetaRepr> Task(
 }
 
 public inline fun <reified T : Any, C : MetaRepr> Task(
-    specification: MetaSpec<C>,
+    specification: MetaReader<C>,
     noinline builder: suspend TaskResultBuilder<T>.(C) -> Unit,
 ): Task<T> = Task(typeOf<T>(), specification, builder)

dataforge-workspace/src/commonMain/kotlin/space/kscience/dataforge/workspace/WorkspaceBuilder.kt

@@ -71,10 +71,10 @@ public inline fun <reified T : Any> TaskContainer.task(
 }
 
 /**
- * Create a task based on [MetaSpec]
+ * Create a task based on [MetaReader]
  */
 public inline fun <reified T : Any, C : MetaRepr> TaskContainer.task(
-    specification: MetaSpec<C>,
+    specification: MetaReader<C>,
     noinline builder: suspend TaskResultBuilder<T>.(C) -> Unit,
 ): PropertyDelegateProvider<Any?, ReadOnlyProperty<Any?, TaskReference<T>>> = PropertyDelegateProvider { _, property ->
     val taskName = Name.parse(property.name)

gradle.properties

@@ -1,10 +1,9 @@
+kotlin.code.style=official
+
 org.gradle.parallel=true
 org.gradle.jvmargs=-Xmx4096m
 
-kotlin.code.style=official
 kotlin.mpp.stability.nowarn=true
-kotlin.incremental.js.ir=true
 kotlin.native.ignoreDisabledTargets=true
 
-toolsVersion=0.15.2-kotlin-1.9.21
+toolsVersion=0.15.4-kotlin-2.0.0
-#kotlin.experimental.tryK2=true