Merge pull request '0.7.0' (!79) from dev into master

Reviewed-on: #79

.space.kts

@@ -1,4 +0,0 @@
-job("Build") {
-    gradlew("openjdk:11", "build")
-}
-

CHANGELOG.md

@@ -14,15 +14,41 @@
 
 ### Security
 
+## 0.7.0 - 2023-11-26
+
+### Added
+
+- Obligatory `type: KType` and `descriptor` property for `MetaConverters`
+- Added separate `Meta`, `SealedMeta` and `ObservableMutableMeta` builders.
+
+### Changed
+
+- Meta converter `metaToObject` returns a non-nullable type. Additional method `metaToObjectOrNull` for nullable return.
+- Kotlin 1.9.20.
+- Migrated from ktor-io to kotlinx-io.
+- `MutableMeta` builder now returns a simplified version of meta that does not hold listeners.
+- More concise names for read/write methods in IO.
+- Remove unnecessary confusion with `get`/`getMeta` by removing `getMeta` from the interface.
+
+### Deprecated
+
+- `String.parseValue` is replaced with `Value.parse`
+
+### Fixed
+
+- Memory leak in SealedMeta builder
+
 ## 0.6.2 - 2023-07-29
 
 ### Changed
+
 - Meta to Json serializer now serializes a single item with index as an array. It is important for plotly integration.
 - Meta to Json serializes Meta without children a value as literal or array instead of an object with `@value` field.
 
 ## 0.6.1 - 2023-03-31
 
 ### Added
+
 - File cache for workspace
 - Smart task metadata transformation for workspace
 - Add `readOnly` property to descriptors
@@ -32,6 +58,7 @@
 - More fine-grained types in Action builders.
 
 ### Changed
+
 - `Name::replaceLast` API
 - `PluginFactory` no longer requires plugin class
 - Collection<Named> toMap -> associateByName
@@ -53,9 +80,11 @@
 - Separate interfaces for `IOReader` and `IOWriter`
 
 ### Deprecated
+
 - Context.fetch -> Context.request
 
 ### Fixed
+
 - `readDataDirectory` does not split names with dots
 - Front matter reader does not crash on non-UTF files
 - Meta file name in readMeta from directory
@@ -64,10 +93,12 @@
 ## 0.5.2
 
 ### Added
+
 - Yaml plugin
 - Partial fix to #53
 
 ### Fixed
+
 - MutableMetaImpl attachment and checks
 - Listeners in observable meta are replaced by lists
 - JS number comparison bug.
@@ -75,9 +106,11 @@
 ## 0.5.0
 
 ### Added
+
 - Experimental `listOfSpec` delegate.
 
 ### Changed
+
 - **API breaking** Config is deprecated, use `ObservableMeta` instead.
 - **API breaking** Descriptor no has a member property `defaultValue` instead of `defaultItem()` extension. It caches default value state on the first call. It is done because computing default on each call is too expensive.
 - Kotlin 1.5.10
@@ -88,24 +121,28 @@
 - **API breaking** Configurable`config` changed to `meta`
 
 ### Removed
+
 - `Config`
 - Public PluginManager mutability
 - Tables and tables-exposed moved to the separate project `tables.kt`
 - BinaryMetaFormat. Use CBOR encoding instead
 
 ### Fixed
+
 - Proper json array index treatment.
 - Proper json index for single-value array.
 
 ## 0.4.0
 
 ### Added
+
 - LogManager plugin
 - dataforge-context API dependency on SLF4j
 - Context `withEnv` and `fetch` methods to manipulate plugins without changing plugins after creation.
 - Split `ItemDescriptor` into builder and read-only part
 
 ### Changed
+
 - Kotlin-logging moved from common to JVM and JS. Replaced by console for native.
 - Package changed to `space.kscience`
 - Scheme made observable
@@ -115,18 +152,22 @@
 - Refactor loggers
 
 ### Deprecated
+
 - Direct use of PluginManager
 
 ### Removed
+
 - Common dependency on Kotlin-logging
 - Kotlinx-io fork dependency. Replaced by Ktor-io.
 
 ### Fixed
+
 - Scheme properties properly handle children property change.
 
 ## 0.3.0
 
 ### Added
+
 - Yaml meta format based on yaml.kt
 - `Path` builders
 - Special ValueType for lists
@@ -134,6 +175,7 @@
 - Multiplatform yaml meta
 
 ### Changed
+
 - `ListValue` and `DoubleArrayValue` implement `Iterable`.
 - Changed the logic of `Value::isList` to check for type instead of size
 - `Meta{}` builder made inline
@@ -150,6 +192,7 @@
 ## 0.2.0
 
 ### Changed
+
 - Context content resolution refactor
 - Kotlin 1.4.10 (build tools 0.6.0)
 - Empty query in Name is null instead of ""
@@ -159,13 +202,16 @@
 - Configurable is no longer MutableItemProvider. All functionality moved to Scheme.
 
 ### Deprecated
+
 - Context activation API
 - TextRenderer
 
 ### Removed
+
 - Functional server prototype
 - `dataforge-output` module
 
 ### Fixed
+
 - Global context CoroutineScope resolution
 - Library mode compliance

README.md

@@ -5,32 +5,29 @@
 
 
 ### [dataforge-context](dataforge-context)
-> 
+> Context and provider definitions
 >
 > **Maturity**: DEVELOPMENT
 
 ### [dataforge-data](dataforge-data)
-> 
 >
 > **Maturity**: EXPERIMENTAL
 
 ### [dataforge-io](dataforge-io)
-> 
+> IO module
 >
-> **Maturity**: PROTOTYPE
+> **Maturity**: EXPERIMENTAL
 
 ### [dataforge-meta](dataforge-meta)
-> 
+> Meta definition and basic operations on meta
 >
 > **Maturity**: DEVELOPMENT
 
 ### [dataforge-scripting](dataforge-scripting)
-> 
 >
 > **Maturity**: PROTOTYPE
 
 ### [dataforge-workspace](dataforge-workspace)
-> 
 >
 > **Maturity**: EXPERIMENTAL
 

build.gradle.kts

@@ -1,5 +1,4 @@
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
-import space.kscience.gradle.isInDevelopment
 import space.kscience.gradle.useApache2Licence
 import space.kscience.gradle.useSPCTeam
 
@@ -9,7 +8,7 @@ plugins {
 
 allprojects {
     group = "space.kscience"
-    version = "0.6.2"
+    version = "0.7.0"
 }
 
 subprojects {
@@ -31,14 +30,7 @@ ksciencePublish {
         useApache2Licence()
         useSPCTeam()
     }
-    github("dataforge-core", "SciProgCentre")
-    space(
-        if (isInDevelopment) {
-            "https://maven.pkg.jetbrains.space/spc/p/sci/dev"
-        } else {
-            "https://maven.pkg.jetbrains.space/spc/p/sci/maven"
-        }
-    )
+    repository("spc","https://maven.sciprog.center/kscience")
     sonatype()
 }
 

dataforge-context/README.md

@@ -6,27 +6,18 @@ Context and provider definitions
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-context:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-context:0.7.0`.
 
-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-context:0.6.2-dev-2'
-}
-```
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
+    //uncomment to access development builds
+    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-context:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-context:0.7.0")
 }
 ```

dataforge-context/api/dataforge-context.api

@@ -195,7 +195,6 @@ public final class space/kscience/dataforge/context/PluginManager : java/lang/It
 public final class space/kscience/dataforge/context/PluginTag : space/kscience/dataforge/meta/MetaRepr {
 	public static final field Companion Lspace/kscience/dataforge/context/PluginTag$Companion;
 	public static final field DATAFORGE_GROUP Ljava/lang/String;
-	public synthetic fun <init> (ILjava/lang/String;Ljava/lang/String;Ljava/lang/String;Lkotlinx/serialization/internal/SerializationConstructorMarker;)V
 	public fun <init> (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
 	public synthetic fun <init> (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
 	public final fun component1 ()Ljava/lang/String;
@@ -211,7 +210,6 @@ public final class space/kscience/dataforge/context/PluginTag : space/kscience/d
 	public final fun matches (Lspace/kscience/dataforge/context/PluginTag;)Z
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
 	public fun toString ()Ljava/lang/String;
-	public static final synthetic fun write$Self (Lspace/kscience/dataforge/context/PluginTag;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
 }
 
 public final class space/kscience/dataforge/context/PluginTag$$serializer : kotlinx/serialization/internal/GeneratedSerializer {

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

@@ -3,8 +3,8 @@ package space.kscience.dataforge.context
 import space.kscience.dataforge.context.Plugin.Companion.TARGET
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MetaRepr
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.misc.Named
-import space.kscience.dataforge.misc.Type
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.parseAsName
 import space.kscience.dataforge.provider.Provider
@@ -18,7 +18,7 @@ import space.kscience.dataforge.provider.Provider
  *
  * create - configure - attach - detach - destroy
  */
-@Type(TARGET)
+@DfId(TARGET)
 public interface Plugin : Named, ContextAware, Provider, MetaRepr {
 
     /**

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

@@ -1,9 +1,9 @@
 package space.kscience.dataforge.context
 
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 
-@Type(PluginFactory.TYPE)
+@DfId(PluginFactory.TYPE)
 public interface PluginFactory<T : Plugin> : Factory<T> {
     public val tag: PluginTag
 

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

@@ -1,7 +1,8 @@
 package space.kscience.dataforge.properties
 
 
-import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.ObservableMutableMeta
 import space.kscience.dataforge.meta.transformations.MetaConverter
 import space.kscience.dataforge.meta.transformations.nullableMetaToObject
 import space.kscience.dataforge.meta.transformations.nullableObjectToMeta
@@ -24,7 +25,7 @@ public class MetaProperty<T : Any>(
 
     override fun onChange(owner: Any?, callback: (T?) -> Unit) {
         meta.onChange(owner) { name ->
-            if (name.startsWith(this@MetaProperty.name)) callback(converter.nullableMetaToObject(get(name)))
+            if (name.startsWith(this@MetaProperty.name)) callback(converter.nullableMetaToObject(this[name]))
         }
     }
 

dataforge-context/src/jvmMain/kotlin/space/kscience/dataforge/provider/dfType.kt

@@ -4,29 +4,29 @@ import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.PluginBuilder
 import space.kscience.dataforge.context.gather
 import space.kscience.dataforge.misc.DFExperimental
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.misc.Named
-import space.kscience.dataforge.misc.Type
 import space.kscience.dataforge.names.Name
 import kotlin.reflect.KClass
 import kotlin.reflect.full.findAnnotation
 
 
 @DFExperimental
-public val KClass<*>.dfType: String
-    get() = findAnnotation<Type>()?.id ?: simpleName ?: ""
+public val KClass<*>.dfId: String
+    get() = findAnnotation<DfId>()?.id ?: simpleName ?: ""
 
 /**
- * Provide an object with given name inferring target from its type using [Type] annotation
+ * Provide an object with given name inferring target from its type using [DfId] annotation
  */
 @DFExperimental
 public inline fun <reified T : Any> Provider.provideByType(name: String): T? {
-    val target = T::class.dfType
+    val target = T::class.dfId
     return provide(target, name)
 }
 
 @DFExperimental
 public inline fun <reified T : Any> Provider.top(): Map<Name, T> {
-    val target = T::class.dfType
+    val target = T::class.dfId
     return top(target)
 }
 
@@ -35,15 +35,15 @@ public inline fun <reified T : Any> Provider.top(): Map<Name, T> {
  */
 @DFExperimental
 public inline fun <reified T : Any> Context.gather(inherit: Boolean = true): Map<Name, T> =
-    gather<T>(T::class.dfType, inherit)
+    gather<T>(T::class.dfId, inherit)
 
 
 @DFExperimental
 public inline fun <reified T : Any> PluginBuilder.provides(items: Map<Name, T>) {
-    provides(T::class.dfType, items)
+    provides(T::class.dfId, items)
 }
 
 @DFExperimental
 public inline fun <reified T : Any> PluginBuilder.provides(vararg items: Named) {
-    provides(T::class.dfType, *items)
+    provides(T::class.dfId, *items)
 }

dataforge-data/README.md

@@ -6,27 +6,18 @@
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-data:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-data:0.7.0`.
 
-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-data:0.6.2-dev-2'
-}
-```
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
+    //uncomment to access development builds
+    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-data:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-data:0.7.0")
 }
 ```

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

@@ -5,7 +5,7 @@ import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MetaRepr
 import space.kscience.dataforge.meta.isEmpty
 import space.kscience.dataforge.misc.DFInternal
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import kotlin.coroutines.CoroutineContext
 import kotlin.coroutines.EmptyCoroutineContext
 import kotlin.reflect.KType
@@ -14,7 +14,7 @@ import kotlin.reflect.typeOf
 /**
  * A data element characterized by its meta
  */
-@Type(Data.TYPE)
+@DfId(Data.TYPE)
 public interface Data<out T> : Goal<T>, MetaRepr {
     /**
      * Type marker for the data. The type is known before the calculation takes place so it could be checked.

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

@@ -6,7 +6,6 @@ import kotlinx.coroutines.flow.emptyFlow
 import kotlinx.coroutines.flow.mapNotNull
 import space.kscience.dataforge.data.Data.Companion.TYPE_OF_NOTHING
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.set
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.endsWith

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

@@ -2,7 +2,7 @@ package space.kscience.dataforge.data
 
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.misc.DFInternal
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.*
 import kotlin.collections.component1
 import kotlin.collections.component2
@@ -31,7 +31,7 @@ public val <T : Any> DataTreeItem<T>.type: KType
 /**
  * A tree-like [DataSet] grouped into the node. All data inside the node must inherit its type
  */
-@Type(DataTree.TYPE)
+@DfId(DataTree.TYPE)
 public interface DataTree<out T : Any> : DataSet<T> {
 
     /**

dataforge-io/README.md

@@ -6,27 +6,18 @@ IO module
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-io:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-io:0.7.0`.
 
-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-io:0.6.2-dev-2'
-}
-```
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
+    //uncomment to access development builds
+    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-io:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-io:0.7.0")
 }
 ```

dataforge-io/build.gradle.kts

@@ -1,11 +1,11 @@
-import space.kscience.gradle.KScienceVersions
-
 plugins {
     id("space.kscience.gradle.mpp")
 }
 
 description = "IO module"
 
+val ioVersion = "0.2.1"
+
 kscience {
     jvm()
     js()
@@ -15,11 +15,12 @@ kscience {
         cbor()
     }
     dependencies {
-        api(project(":dataforge-context"))
-        api("io.ktor:ktor-io:${KScienceVersions.ktorVersion}")
+        api(projects.dataforgeContext)
+        api("org.jetbrains.kotlinx:kotlinx-io-core:$ioVersion")
+        api("org.jetbrains.kotlinx:kotlinx-io-bytestring:$ioVersion")
     }
 }
 
-readme {
-    maturity = space.kscience.gradle.Maturity.PROTOTYPE
+readme{
+    maturity = space.kscience.gradle.Maturity.EXPERIMENTAL
 }

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

@@ -6,27 +6,18 @@ YAML meta IO
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-io-yaml:0.7.0`.
 
-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-io-yaml:0.6.2-dev-2'
-}
-```
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
+    //uncomment to access development builds
+    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-io-yaml:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-io-yaml:0.7.0")
 }
 ```

dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/FrontMatterEnvelopeFormat.kt

@@ -1,7 +1,11 @@
 package space.kscience.dataforge.io.yaml
 
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.encodeToByteString
+import kotlinx.io.readByteString
+import kotlinx.io.writeString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.io.*
@@ -15,49 +19,49 @@ public class FrontMatterEnvelopeFormat(
     private val metaFormatFactory: MetaFormatFactory = YamlMetaFormat,
 ) : EnvelopeFormat {
 
-    override fun readObject(binary: Binary): Envelope = binary.read {
+    override fun readFrom(binary: Binary): Envelope = binary.read {
         var offset = 0
 
         offset += discardWithSeparator(
-            SEPARATOR.encodeToByteArray(),
+            SEPARATOR,
             atMost = 1024,
         )
 
         val line = ByteArray {
-            offset += readWithSeparatorTo(this, "\n".encodeToByteArray())
+            offset += readWithSeparatorTo(this, "\n".encodeToByteString())
         }.decodeToString()
 
         val readMetaFormat = line.trim().takeIf { it.isNotBlank() }?.let { io.resolveMetaFormat(it) } ?: YamlMetaFormat
 
         val packet = ByteArray {
-            offset += readWithSeparatorTo(this, SEPARATOR.encodeToByteArray())
+            offset += readWithSeparatorTo(this, SEPARATOR)
         }
 
         offset += discardLine()
 
-        val meta = readMetaFormat.readObject(packet.asBinary())
+        val meta = readMetaFormat.readFrom(packet.asBinary())
         Envelope(meta, binary.view(offset))
     }
 
-    override fun readObject(input: Input): Envelope = readObject(input.readBinary())
+    override fun readFrom(source: Source): Envelope = readFrom(source.readBinary())
 
-    override fun writeObject(
-        output: Output,
+    override fun writeTo(
+        sink: Sink,
         obj: Envelope,
     ) {
         val metaFormat = metaFormatFactory.build(io.context, meta)
         val formatSuffix = if (metaFormat is YamlMetaFormat) "" else metaFormatFactory.shortName
-        output.writeRawString("$SEPARATOR${formatSuffix}\r\n")
-        metaFormat.run { metaFormat.writeObject(output, obj.meta) }
-        output.writeRawString("$SEPARATOR\r\n")
+        sink.writeString("$SEPARATOR${formatSuffix}\r\n")
+        metaFormat.run { metaFormat.writeTo(sink, obj.meta) }
+        sink.writeString("$SEPARATOR\r\n")
         //Printing data
         obj.data?.let { data ->
-            output.writeBinary(data)
+            sink.writeBinary(data)
         }
     }
 
     public companion object : EnvelopeFormatFactory {
-        public const val SEPARATOR: String = "---"
+        public val SEPARATOR: ByteString = "---".encodeToByteString()
 
         private val metaTypeRegex = "---(\\w*)\\s*".toRegex()
 
@@ -69,8 +73,8 @@ public class FrontMatterEnvelopeFormat(
 
         override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? = binary.read {
             //read raw string to avoid UTF issues
-            val line = readRawString(3)
-            return@read if (line == "---") {
+            val line = readByteString(3)
+            return@read if (line == "---".encodeToByteString()) {
                 default
             } else {
                 null
@@ -79,15 +83,15 @@ public class FrontMatterEnvelopeFormat(
 
         private val default by lazy { build(Global, Meta.EMPTY) }
 
-        override fun readObject(binary: Binary): Envelope = default.readObject(binary)
+        override fun readFrom(binary: Binary): Envelope = default.readFrom(binary)
 
-        override fun writeObject(
-            output: Output,
+        override fun writeTo(
+            sink: Sink,
             obj: Envelope,
-        ): Unit = default.writeObject(output, obj)
+        ): Unit = default.writeTo(sink, obj)
 
 
-        override fun readObject(input: Input): Envelope = default.readObject(input)
+        override fun readFrom(source: Source): Envelope = default.readFrom(source)
 
     }
 }

dataforge-io/dataforge-io-yaml/src/commonMain/kotlin/space/kscience/dataforge/io/yaml/YamlMetaFormat.kt

@@ -1,13 +1,13 @@
 package space.kscience.dataforge.io.yaml
 
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readString
+import kotlinx.io.writeString
 import net.mamoe.yamlkt.*
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.io.MetaFormat
 import space.kscience.dataforge.io.MetaFormatFactory
-import space.kscience.dataforge.io.readUtf8String
-import space.kscience.dataforge.io.writeUtf8String
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.descriptors.get
@@ -32,7 +32,7 @@ public fun Meta.toYaml(): YamlMap {
 private class YamlMeta(private val yamlMap: YamlMap, private val descriptor: MetaDescriptor? = null) : Meta {
 
     override val value: Value?
-        get() = yamlMap.getStringOrNull(null)?.parseValue()
+        get() = yamlMap.getStringOrNull(null)?.let { Value.parse(it) }
 
     private fun buildItems(): Map<NameToken, Meta> {
         val map = LinkedHashMap<NameToken, Meta>()
@@ -43,13 +43,13 @@ private class YamlMeta(private val yamlMap: YamlMap, private val descriptor: Met
             val token = NameToken(stringKey)
             when (value) {
                 YamlNull -> Meta(Null)
-                is YamlLiteral -> map[token] = Meta(value.content.parseValue())
+                is YamlLiteral -> map[token] = Meta(Value.parse(value.content))
                 is YamlMap -> map[token] = value.toMeta()
                 is YamlList -> if (value.all { it is YamlLiteral }) {
                     val listValue = ListValue(
                         value.map {
                             //We already checked that all values are primitives
-                            (it as YamlLiteral).content.parseValue()
+                            Value.parse((it as YamlLiteral).content)
                         }
                     )
                     map[token] = Meta(listValue)
@@ -75,7 +75,7 @@ private class YamlMeta(private val yamlMap: YamlMap, private val descriptor: Met
 
 public fun YamlElement.toMeta(descriptor: MetaDescriptor? = null): Meta = when (this) {
     YamlNull -> Meta(Null)
-    is YamlLiteral -> Meta(content.parseValue())
+    is YamlLiteral -> Meta(Value.parse(content))
     is YamlMap -> toMeta()
     //We can't return multiple items therefore we create top level node
     is YamlList -> YamlMap(mapOf("@yamlArray" to this)).toMeta(descriptor)
@@ -89,14 +89,14 @@ public fun YamlMap.toMeta(): Meta = YamlMeta(this)
  */
 public class YamlMetaFormat(private val meta: Meta) : MetaFormat {
 
-    override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?) {
+    override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?) {
         val yaml: YamlMap = meta.toYaml()
         val string = Yaml.encodeToString(YamlMap.serializer(), yaml)
-        output.writeUtf8String(string)
+        sink.writeString(string)
     }
 
-    override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta {
-        val yaml = Yaml.decodeYamlMapFromString(input.readUtf8String())
+    override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta {
+        val yaml = Yaml.decodeYamlMapFromString(source.readString())
         return yaml.toMeta()
     }
 
@@ -109,10 +109,10 @@ public class YamlMetaFormat(private val meta: Meta) : MetaFormat {
 
         private val default = YamlMetaFormat(Meta.EMPTY)
 
-        override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?): Unit =
-            default.writeMeta(output, meta, descriptor)
+        override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?): Unit =
+            default.writeMeta(sink, meta, descriptor)
 
-        override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta =
-            default.readMeta(input, descriptor)
+        override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta =
+            default.readMeta(source, descriptor)
     }
 }

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/Binary.kt

@@ -1,6 +1,9 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.*
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.buffered
+import kotlinx.io.readByteArray
 import kotlin.math.min
 
 /**
@@ -17,13 +20,13 @@ public interface Binary {
      * Read maximum of [atMost] bytes as input from the binary, starting at [offset]. The generated input is always closed
      * when leaving scope, so it could not be leaked outside of scope of [block].
      */
-    public fun <R> read(offset: Int = 0, atMost: Int = size - offset, block: Input.() -> R): R
+    public fun <R> read(offset: Int = 0, atMost: Int = size - offset, block: Source.() -> R): R
 
-    public suspend fun <R> readSuspend(offset: Int = 0, atMost: Int = size - offset, block: suspend Input.() -> R): R
+    public suspend fun <R> readSuspend(offset: Int = 0, atMost: Int = size - offset, block: suspend Source.() -> R): R
 
     /**
      * Read a binary with given [offset] relative to this binary and given [binarySize].
-     * In general, resulting binary is of the same type as this one, but it is not guaranteed.
+     * In general, the resulting binary is of the same type as this one, but it is not guaranteed.
      */
     public fun view(offset: Int, binarySize: Int = size - offset): Binary
 
@@ -38,25 +41,27 @@ internal class ByteArrayBinary(
     override val size: Int = array.size - start,
 ) : Binary {
 
-    override fun <R> read(offset: Int, atMost: Int, block: Input.() -> R): R {
+    override fun <R> read(offset: Int, atMost: Int, block: Source.() -> R): R {
         require(offset >= 0) { "Offset must be positive" }
         require(offset < array.size) { "Offset $offset is larger than array size" }
-        val input = ByteReadPacket(
+
+        return ByteArraySource(
             array,
             offset + start,
             min(atMost, size - offset)
-        )
-        return input.use(block)
+        ).buffered().use(block)
     }
 
-    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Input.() -> R): R {
+    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Source.() -> R): R {
         require(offset >= 0) { "Offset must be positive" }
         require(offset < array.size) { "Offset $offset is larger than array size" }
-        val input = ByteReadPacket(
+
+        val input = ByteArraySource(
             array,
             offset + start,
             min(atMost, size - offset)
-        )
+        ).buffered()
+
         return try {
             block(input)
         } finally {
@@ -77,26 +82,26 @@ public fun Binary.toByteArray(): ByteArray = if (this is ByteArrayBinary) {
     array.copyOfRange(start, start + size) // TODO do we need to ensure data safety here?
 } else {
     read {
-        readBytes()
+        readByteArray()
     }
 }
 
 //TODO optimize for file-based Inputs
-public fun Input.readBinary(size: Int? = null): Binary {
-    val array = if (size == null) readBytes() else readBytes(size)
+public fun Source.readBinary(size: Int? = null): Binary {
+    val array = if (size == null) readByteArray() else readByteArray(size)
     return ByteArrayBinary(array)
 }
 
 /**
  * Direct write of binary to the output. Returns the number of bytes written
  */
-public fun Output.writeBinary(binary: Binary): Int {
+public fun Sink.writeBinary(binary: Binary): Int {
     return if (binary is ByteArrayBinary) {
-        writeFully(binary.array, binary.start, binary.start + binary.size)
+        write(binary.array, binary.start, binary.start + binary.size)
         binary.size
     } else {
         binary.read {
-            copyTo(this@writeBinary).toInt()
+            transferTo(this@writeBinary).toInt()
         }
     }
 }

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeBuilder.kt

@@ -1,6 +1,6 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
 import space.kscience.dataforge.meta.*
 
 public class EnvelopeBuilder : Envelope {
@@ -33,7 +33,7 @@ public class EnvelopeBuilder : Envelope {
     /**
      * Construct a data binary from given builder
      */
-    public inline fun data(block: Output.() -> Unit) {
+    public inline fun data(block: Sink.() -> Unit) {
         data = ByteArray { block() }.asBinary()
     }
 

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeFormat.kt

@@ -1,10 +1,10 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.Input
+import kotlinx.io.Source
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.io.EnvelopeFormatFactory.Companion.ENVELOPE_FORMAT_TYPE
 import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import kotlin.reflect.KType
@@ -15,9 +15,9 @@ public interface EnvelopeFormat : IOFormat<Envelope> {
     override val type: KType get() = typeOf<Envelope>()
 }
 
-public fun EnvelopeFormat.read(input: Input): Envelope = readObject(input)
+public fun EnvelopeFormat.read(input: Source): Envelope = readFrom(input)
 
-@Type(ENVELOPE_FORMAT_TYPE)
+@DfId(ENVELOPE_FORMAT_TYPE)
 public interface EnvelopeFormatFactory : IOFormatFactory<Envelope>, EnvelopeFormat {
     override val type: KType get() = typeOf<Envelope>()
 

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/EnvelopeParts.kt

@@ -1,5 +1,8 @@
 package space.kscience.dataforge.io
 
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.decodeToString
+import kotlinx.io.write
 import space.kscience.dataforge.io.Envelope.Companion.ENVELOPE_NODE_KEY
 import space.kscience.dataforge.io.PartDescriptor.Companion.DEFAULT_MULTIPART_DATA_SEPARATOR
 import space.kscience.dataforge.io.PartDescriptor.Companion.MULTIPART_DATA_TYPE
@@ -20,7 +23,7 @@ private class PartDescriptor : Scheme() {
         val PARTS_KEY = MULTIPART_KEY + "parts"
         val SEPARATOR_KEY = MULTIPART_KEY + "separator"
 
-        const val DEFAULT_MULTIPART_DATA_SEPARATOR = "\r\n#~PART~#\r\n"
+        val DEFAULT_MULTIPART_DATA_SEPARATOR = "\r\n#~PART~#\r\n".toAsciiByteString()
 
         const val MULTIPART_DATA_TYPE = "envelope.multipart"
     }
@@ -32,12 +35,12 @@ public typealias EnvelopeParts = List<EnvelopePart>
 
 public fun EnvelopeBuilder.multipart(
     parts: EnvelopeParts,
-    separator: String = DEFAULT_MULTIPART_DATA_SEPARATOR,
+    separator: ByteString = DEFAULT_MULTIPART_DATA_SEPARATOR,
 ) {
     dataType = MULTIPART_DATA_TYPE
 
     var offsetCounter = 0
-    val separatorSize = separator.length
+    val separatorSize = separator.size
     val partDescriptors = parts.map { (binary, description) ->
         offsetCounter += separatorSize
         PartDescriptor {
@@ -51,14 +54,14 @@ public fun EnvelopeBuilder.multipart(
 
     meta {
         if (separator != DEFAULT_MULTIPART_DATA_SEPARATOR) {
-            SEPARATOR_KEY put separator
+            SEPARATOR_KEY put separator.decodeToString()
         }
         setIndexed(PARTS_KEY, partDescriptors.map { it.toMeta() })
     }
 
     data {
         parts.forEach {
-            writeRawString(separator)
+            write(separator)
             writeBinary(it.binary)
         }
     }
@@ -69,7 +72,7 @@ public fun EnvelopeBuilder.multipart(
  */
 public fun EnvelopeBuilder.envelopes(
     envelopes: List<Envelope>,
-    separator: String = DEFAULT_MULTIPART_DATA_SEPARATOR,
+    separator: ByteString = DEFAULT_MULTIPART_DATA_SEPARATOR,
 ) {
     val parts = envelopes.map {
         val binary = Binary(it, TaggedEnvelopeFormat)

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/IOFormat.kt

@@ -1,12 +1,14 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.*
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readByteArray
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Factory
 import space.kscience.dataforge.io.IOFormatFactory.Companion.IO_FORMAT_TYPE
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.misc.Named
-import space.kscience.dataforge.misc.Type
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import kotlin.reflect.KType
@@ -21,9 +23,9 @@ public interface IOReader<out T> {
      */
     public val type: KType
 
-    public fun readObject(input: Input): T
+    public fun readFrom(source: Source): T
 
-    public fun readObject(binary: Binary): T = binary.read { readObject(this) }
+    public fun readFrom(binary: Binary): T = binary.read { readFrom(this) }
 
     public companion object {
         /**
@@ -32,21 +34,21 @@ public interface IOReader<out T> {
         public val binary: IOReader<Binary> = object : IOReader<Binary> {
             override val type: KType = typeOf<Binary>()
 
-            override fun readObject(input: Input): Binary = input.readBytes().asBinary()
+            override fun readFrom(source: Source): Binary = source.readByteArray().asBinary()
 
-            override fun readObject(binary: Binary): Binary = binary
+            override fun readFrom(binary: Binary): Binary = binary
         }
     }
 }
 
-public inline fun <reified T> IOReader(crossinline read: Input.() -> T): IOReader<T> = object : IOReader<T> {
+public inline fun <reified T> IOReader(crossinline read: Source.() -> T): IOReader<T> = object : IOReader<T> {
     override val type: KType = typeOf<T>()
 
-    override fun readObject(input: Input): T = input.read()
+    override fun readFrom(source: Source): T = source.read()
 }
 
 public fun interface IOWriter<in T> {
-    public fun writeObject(output: Output, obj: T)
+    public fun writeTo(sink: Sink, obj: T)
 }
 
 /**
@@ -54,24 +56,23 @@ public fun interface IOWriter<in T> {
  */
 public interface IOFormat<T> : IOReader<T>, IOWriter<T>
 
-public fun <T : Any> Input.readObject(format: IOReader<T>): T = format.readObject(this@readObject)
+public fun <T : Any> Source.readWith(format: IOReader<T>): T = format.readFrom(this)
 
-public fun <T : Any> IOFormat<T>.readObjectFrom(binary: Binary): T = binary.read {
-    readObject(this)
+/**
+ * Read given binary as an object using given format
+ */
+public fun <T : Any> Binary.readWith(format: IOReader<T>): T = read {
+    readWith(format)
 }
 
 /**
- * Read given binary as object using given format
+ * Write an object to the [Sink] with given [format]
  */
-public fun <T : Any> Binary.readWith(format: IOReader<T>): T = read {
-    readObject(format)
-}
-
-public fun <T : Any> Output.writeObject(format: IOWriter<T>, obj: T): Unit =
-    format.writeObject(this@writeObject, obj)
+public fun <T : Any> Sink.writeWith(format: IOWriter<T>, obj: T): Unit =
+    format.writeTo(this, obj)
 
 
-@Type(IO_FORMAT_TYPE)
+@DfId(IO_FORMAT_TYPE)
 public interface IOFormatFactory<T : Any> : Factory<IOFormat<T>>, Named {
     /**
      * Explicit type for dynamic type checks
@@ -85,18 +86,33 @@ public interface IOFormatFactory<T : Any> : Factory<IOFormat<T>>, Named {
     }
 }
 
-public fun <T : Any> Binary(obj: T, format: IOWriter<T>): Binary = Binary { format.writeObject(this, obj) }
+public fun <T : Any> Binary(obj: T, format: IOWriter<T>): Binary = Binary { format.writeTo(this, obj) }
+
+public object FloatIOFormat : IOFormat<Float>, IOFormatFactory<Float> {
+    override fun build(context: Context, meta: Meta): IOFormat<Float> = this
+
+    override val name: Name = "float32".asName()
+
+    override val type: KType get() = typeOf<Float>()
+
+    override fun writeTo(sink: Sink, obj: Float) {
+        sink.writeFloat(obj)
+    }
+
+    override fun readFrom(source: Source): Float = source.readFloat()
+}
+
 
 public object DoubleIOFormat : IOFormat<Double>, IOFormatFactory<Double> {
     override fun build(context: Context, meta: Meta): IOFormat<Double> = this
 
-    override val name: Name = "double".asName()
+    override val name: Name = "float64".asName()
 
     override val type: KType get() = typeOf<Double>()
 
-    override fun writeObject(output: Output, obj: Double) {
-        output.writeDouble(obj)
+    override fun writeTo(sink: Sink, obj: Double) {
+        sink.writeLong(obj.toBits())
     }
 
-    override fun readObject(input: Input): Double = input.readDouble()
+    override fun readFrom(source: Source): Double = source.readDouble()
 }

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/JsonMetaFormat.kt

@@ -1,10 +1,10 @@
-@file:Suppress("UNUSED_PARAMETER")
-
 package space.kscience.dataforge.io
 
 
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readString
+import kotlinx.io.writeString
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonElement
 import space.kscience.dataforge.context.Context
@@ -18,13 +18,13 @@ import space.kscience.dataforge.meta.toMeta
  */
 public class JsonMetaFormat(private val json: Json = DEFAULT_JSON) : MetaFormat {
 
-    override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?) {
+    override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?) {
         val jsonElement = meta.toJson(descriptor)
-        output.writeUtf8String(json.encodeToString(JsonElement.serializer(), jsonElement))
+        sink.writeString(json.encodeToString(JsonElement.serializer(), jsonElement))
     }
 
-    override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta {
-        val str = input.readUtf8String()//readByteArray().decodeToString()
+    override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta {
+        val str = source.readString()
         val jsonElement = json.parseToJsonElement(str)
         return jsonElement.toMeta(descriptor)
     }
@@ -39,10 +39,10 @@ public class JsonMetaFormat(private val json: Json = DEFAULT_JSON) : MetaFormat
 
         private val default = JsonMetaFormat()
 
-        override fun writeMeta(output: Output, meta: Meta, descriptor: MetaDescriptor?): Unit =
-            default.run { writeMeta(output, meta, descriptor) }
+        override fun writeMeta(sink: Sink, meta: Meta, descriptor: MetaDescriptor?): Unit =
+            default.run { writeMeta(sink, meta, descriptor) }
 
-        override fun readMeta(input: Input, descriptor: MetaDescriptor?): Meta =
-            default.run { readMeta(input, descriptor) }
+        override fun readMeta(source: Source, descriptor: MetaDescriptor?): Meta =
+            default.run { readMeta(source, descriptor) }
     }
 }

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/MetaFormat.kt

@@ -1,15 +1,15 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
-import io.ktor.utils.io.core.use
+
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.buffered
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.io.MetaFormatFactory.Companion.META_FORMAT_TYPE
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
 import space.kscience.dataforge.names.plus
@@ -23,22 +23,22 @@ public interface MetaFormat : IOFormat<Meta> {
 
     override val type: KType get() = typeOf<Meta>()
 
-    override fun writeObject(output: Output, obj: Meta) {
-        writeMeta(output, obj, null)
+    override fun writeTo(sink: Sink, obj: Meta) {
+        writeMeta(sink, obj, null)
     }
 
-    override fun readObject(input: Input): Meta = readMeta(input)
+    override fun readFrom(source: Source): Meta = readMeta(source)
 
     public fun writeMeta(
-        output: Output,
+        sink: Sink,
         meta: Meta,
         descriptor: MetaDescriptor? = null,
     )
 
-    public fun readMeta(input: Input, descriptor: MetaDescriptor? = null): Meta
+    public fun readMeta(source: Source, descriptor: MetaDescriptor? = null): Meta
 }
 
-@Type(META_FORMAT_TYPE)
+@DfId(META_FORMAT_TYPE)
 public interface MetaFormatFactory : IOFormatFactory<Meta>, MetaFormat {
     public val shortName: String
 
@@ -57,15 +57,13 @@ public interface MetaFormatFactory : IOFormatFactory<Meta>, MetaFormat {
 
 public fun Meta.toString(format: MetaFormat): String = ByteArray {
     format.run {
-        writeObject(this@ByteArray, this@toString)
+        writeTo(this@ByteArray, this@toString)
     }
 }.decodeToString()
 
 public fun Meta.toString(formatFactory: MetaFormatFactory): String = toString(formatFactory.build(Global, Meta.EMPTY))
 
-public fun MetaFormat.parse(str: String): Meta {
-    return ByteReadPacket(str.encodeToByteArray()).use { readObject(it) }
-}
+public fun MetaFormat.parse(str: String): Meta = readFrom(StringSource(str).buffered())
 
 public fun MetaFormatFactory.parse(str: String, formatMeta: Meta): Meta = build(Global, formatMeta).parse(str)
 

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaggedEnvelopeFormat.kt

@@ -1,6 +1,7 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.*
+import kotlinx.io.*
+import kotlinx.io.bytestring.decodeToString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.Meta
@@ -18,7 +19,7 @@ import space.kscience.dataforge.names.plus
 public class TaggedEnvelopeFormat(
     public val io: IOPlugin,
     public val version: VERSION = VERSION.DF02,
-    public val metaFormatFactory: MetaFormatFactory = JsonMetaFormat
+    public val metaFormatFactory: MetaFormatFactory = JsonMetaFormat,
 ) : EnvelopeFormat {
 
 //    private val metaFormat = io.metaFormat(metaFormatKey)
@@ -26,59 +27,60 @@ public class TaggedEnvelopeFormat(
 
 
     private fun Tag.toBinary() = Binary {
-        writeRawString(START_SEQUENCE)
-        writeRawString(version.name)
+        write(START_SEQUENCE)
+        writeString(version.name)
         writeShort(metaFormatKey)
         writeUInt(metaSize)
         when (version) {
             VERSION.DF02 -> {
                 writeUInt(dataSize.toUInt())
             }
+
             VERSION.DF03 -> {
                 writeULong(dataSize)
             }
         }
-        writeRawString(END_SEQUENCE)
+        write(END_SEQUENCE)
     }
 
-    override fun writeObject(
-        output: Output,
+    override fun writeTo(
+        sink: Sink,
         obj: Envelope,
     ) {
         val metaFormat = metaFormatFactory.build(io.context, Meta.EMPTY)
-        val metaBytes = Binary(obj.meta,metaFormat)
+        val metaBytes = Binary(obj.meta, metaFormat)
         val actualSize: ULong = (obj.data?.size ?: 0).toULong()
         val tag = Tag(metaFormatFactory.key, metaBytes.size.toUInt() + 2u, actualSize)
-        output.writeBinary(tag.toBinary())
-        output.writeBinary(metaBytes)
-        output.writeRawString("\r\n")
+        sink.writeBinary(tag.toBinary())
+        sink.writeBinary(metaBytes)
+        sink.writeString("\r\n")
         obj.data?.let {
-            output.writeBinary(it)
+            sink.writeBinary(it)
         }
     }
 
     /**
      * Read an envelope from input into memory
      *
-     * @param input an input to read from
+     * @param source an input to read from
      * @param formats a collection of meta formats to resolve
      */
-    override fun readObject(input: Input): Envelope {
-        val tag = input.readTag(this.version)
+    override fun readFrom(source: Source): Envelope {
+        val tag = source.readTag(this.version)
 
         val metaFormat = io.resolveMetaFormat(tag.metaFormatKey)
             ?: error("Meta format with key ${tag.metaFormatKey} not found")
 
-        val metaBinary = input.readBinary(tag.metaSize.toInt())
+        val metaBinary = source.readBinary(tag.metaSize.toInt())
 
-        val meta: Meta = metaFormat.readObjectFrom(metaBinary)
+        val meta: Meta = metaFormat.readFrom(metaBinary)
 
-        val data = input.readBinary(tag.dataSize.toInt())
+        val data = source.readBinary(tag.dataSize.toInt())
 
         return SimpleEnvelope(meta, data)
     }
 
-    override fun readObject(binary: Binary): Envelope = binary.read{
+    override fun readFrom(binary: Binary): Envelope = binary.read {
         val tag = readTag(version)
 
         val metaFormat = io.resolveMetaFormat(tag.metaFormatKey)
@@ -86,7 +88,7 @@ public class TaggedEnvelopeFormat(
 
         val metaBinary = readBinary(tag.metaSize.toInt())
 
-        val meta: Meta = metaFormat.readObjectFrom(metaBinary)
+        val meta: Meta = metaFormat.readFrom(metaBinary)
 
 
         SimpleEnvelope(meta, binary.view((version.tagSize + tag.metaSize).toInt(), tag.dataSize.toInt()))
@@ -104,8 +106,8 @@ public class TaggedEnvelopeFormat(
     }
 
     public companion object : EnvelopeFormatFactory {
-        private const val START_SEQUENCE = "#~"
-        private const val END_SEQUENCE = "~#\r\n"
+        private val START_SEQUENCE = "#~".toAsciiByteString()
+        private val END_SEQUENCE = "~#\r\n".toAsciiByteString()
 
         override val name: Name = EnvelopeFormatFactory.ENVELOPE_FACTORY_NAME + "tagged"
 
@@ -121,53 +123,48 @@ public class TaggedEnvelopeFormat(
             return TaggedEnvelopeFormat(io, version)
         }
 
-        private fun Input.readTag(version: VERSION): Tag {
-            val start = readRawString(2)
+        private fun Source.readTag(version: VERSION): Tag {
+            val start = readByteString(2)
             if (start != START_SEQUENCE) error("The input is not an envelope")
-            val versionString = readRawString(4)
-            if (version.name != versionString) error("Wrong version of DataForge: expected $version but found $versionString")
+            val versionString = readByteString(4)
+            if (version.name.toAsciiByteString() != versionString) error("Wrong version of DataForge: expected $version but found $versionString")
             val metaFormatKey = readShort()
             val metaLength = readUInt()
             val dataLength: ULong = when (version) {
                 VERSION.DF02 -> readUInt().toULong()
                 VERSION.DF03 -> readULong()
             }
-            val end = readRawString(4)
+            val end = readByteString(4)
             if (end != END_SEQUENCE) error("The input is not an envelope")
             return Tag(metaFormatKey, metaLength, dataLength)
         }
 
-        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? {
-            return try {
-                binary.read {
-                    val header = readRawString(6)
-                    return@read when (header.substring(2..5)) {
-                        VERSION.DF02.name -> TaggedEnvelopeFormat(io, VERSION.DF02)
-                        VERSION.DF03.name -> TaggedEnvelopeFormat(io, VERSION.DF03)
-                        else -> null
-                    }
+        override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? = try {
+            binary.read {
+                val header = readByteString(6)
+                when (header.substring(2, 6).decodeToString()) {
+                    VERSION.DF02.name -> TaggedEnvelopeFormat(io, VERSION.DF02)
+                    VERSION.DF03.name -> TaggedEnvelopeFormat(io, VERSION.DF03)
+                    else -> null
                 }
-            } catch (ex: Exception) {
-                null
             }
+        } catch (ex: Exception) {
+            null
         }
 
         private val default by lazy { build(Global, Meta.EMPTY) }
 
-        override fun readObject(binary: Binary): Envelope =
-            default.run { readObject(binary) }
+        override fun readFrom(binary: Binary): Envelope =
+            default.run { readFrom(binary) }
 
-        override fun writeObject(
-            output: Output,
+        override fun writeTo(
+            sink: Sink,
             obj: Envelope,
         ): Unit = default.run {
-            writeObject(
-                output,
-                obj,
-            )
+            writeTo(sink, obj)
         }
 
-        override fun readObject(input: Input): Envelope = default.readObject(input)
+        override fun readFrom(source: Source): Envelope = default.readFrom(source)
     }
 
 }

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/TaglessEnvelopeFormat.kt

@@ -1,9 +1,9 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
-import io.ktor.utils.io.core.readUTF8UntilDelimiterTo
+
+import kotlinx.io.*
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.encodeToByteString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.Meta
@@ -28,35 +28,36 @@ public class TaglessEnvelopeFormat(
 //        writeFully("#? $key: $value;\r\n".encodeToByteArray())
 //    }
 
-    override fun writeObject(
-        output: Output,
+    override fun writeTo(
+        sink: Sink,
         obj: Envelope,
     ) {
         val metaFormat = metaFormatFactory.build(this.io.context, meta)
 
         //printing header
-        output.writeRawString(TAGLESS_ENVELOPE_HEADER + "\r\n")
+        sink.write(TAGLESS_ENVELOPE_HEADER)
+        sink.writeString("\r\n")
 
         //Printing meta
         if (!obj.meta.isEmpty()) {
             val metaBinary = Binary(obj.meta, metaFormat)
-            output.writeUtf8String(META_START + "-${metaFormatFactory.shortName}\r\n")
-            output.writeBinary(metaBinary)
-            output.writeRawString("\r\n")
+            sink.writeString(META_START + "-${metaFormatFactory.shortName}\r\n")
+            sink.writeBinary(metaBinary)
+            sink.writeString("\r\n")
         }
 
         //Printing data
         obj.data?.let { data ->
             //val actualSize: Int = envelope.data?.size ?: 0
-            output.writeUtf8String(DATA_START + "\r\n")
-            output.writeBinary(data)
+            sink.writeString(DATA_START + "\r\n")
+            sink.writeBinary(data)
         }
     }
 
-    override fun readObject(input: Input): Envelope {
+    override fun readFrom(source: Source): Envelope {
         //read preamble
-        input.discardWithSeparator(
-            TAGLESS_ENVELOPE_HEADER.encodeToByteArray(),
+        source.discardWithSeparator(
+            TAGLESS_ENVELOPE_HEADER,
             atMost = 1024,
         )
 
@@ -64,22 +65,22 @@ public class TaglessEnvelopeFormat(
 
         var data: Binary? = null
 
-        input.discardWithSeparator(
+        source.discardWithSeparator(
             SEPARATOR_PREFIX,
             atMost = 1024,
         )
 
         var header: String = ByteArray {
-            input.readUTF8UntilDelimiterTo(this, "\n")
+            source.readWithSeparatorTo(this, "\n".encodeToByteString())
         }.decodeToString()
 
-        while (!input.endOfInput) {
+        while (!source.exhausted()) {
             val block = ByteArray {
-                input.readWithSeparatorTo(this, SEPARATOR_PREFIX)
+                source.readWithSeparatorTo(this, SEPARATOR_PREFIX)
             }
 
             val nextHeader = ByteArray {
-                input.readWithSeparatorTo(this, "\n".encodeToByteArray())
+                source.readWithSeparatorTo(this, "\n".encodeToByteString())
             }.decodeToString()
 
             //terminate on end
@@ -89,7 +90,7 @@ public class TaglessEnvelopeFormat(
             if (header.startsWith("META")) {
                 //TODO check format
                 val metaFormat: MetaFormatFactory = JsonMetaFormat
-                meta = metaFormat.readMeta(ByteReadPacket(block))
+                meta = metaFormat.readMeta(ByteArraySource(block).buffered())
             }
 
             if (header.startsWith("DATA")) {
@@ -111,9 +112,9 @@ public class TaglessEnvelopeFormat(
 
         public const val TAGLESS_ENVELOPE_TYPE: String = "tagless"
 
-        public val SEPARATOR_PREFIX: ByteArray = "\n#~".encodeToByteArray()
+        public val SEPARATOR_PREFIX: ByteString = "\n#~".encodeToByteString()
 
-        public const val TAGLESS_ENVELOPE_HEADER: String = "#~DFTL"
+        public val TAGLESS_ENVELOPE_HEADER: ByteString = "#~DFTL".encodeToByteString()
 
         //        public const val META_START_PROPERTY: String = "metaSeparator"
         public const val META_START: String = "#~META"
@@ -131,24 +132,21 @@ public class TaglessEnvelopeFormat(
 
         private val default by lazy { build(Global, Meta.EMPTY) }
 
-        override fun readObject(binary: Binary): Envelope = default.run { readObject(binary) }
+        override fun readFrom(binary: Binary): Envelope = default.run { readFrom(binary) }
 
-        override fun writeObject(
-            output: Output,
+        override fun writeTo(
+            sink: Sink,
             obj: Envelope,
         ): Unit = default.run {
-            writeObject(
-                output,
-                obj,
-            )
+            writeTo(sink, obj)
         }
 
-        override fun readObject(input: Input): Envelope = default.readObject(input)
+        override fun readFrom(source: Source): Envelope = default.readFrom(source)
 
         override fun peekFormat(io: IOPlugin, binary: Binary): EnvelopeFormat? {
             return try {
                 binary.read {
-                    val string = readRawString(TAGLESS_ENVELOPE_HEADER.length)
+                    val string = readByteString(TAGLESS_ENVELOPE_HEADER.size)
                     return@read if (string == TAGLESS_ENVELOPE_HEADER) {
                         TaglessEnvelopeFormat(io)
                     } else {

dataforge-io/src/commonMain/kotlin/space/kscience/dataforge/io/ioMisc.kt

@@ -1,40 +1,41 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.bits.Memory
-import io.ktor.utils.io.charsets.Charsets
-import io.ktor.utils.io.charsets.decodeExactBytes
-import io.ktor.utils.io.core.*
-import io.ktor.utils.io.core.internal.ChunkBuffer
+import kotlinx.io.*
+import kotlinx.io.bytestring.ByteString
+import kotlinx.io.bytestring.decodeToString
+import kotlinx.io.bytestring.encodeToByteString
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.misc.DFExperimental
+import kotlin.math.min
 
-public fun Output.writeRawString(str: String) {
-    writeFully(str.toByteArray(Charsets.ISO_8859_1))
+/**
+ * Convert a string literal, containing only ASCII characters to a [ByteString].
+ * Throws an error if there are non-ASCII characters.
+ */
+public fun String.toAsciiByteString(): ByteString {
+    val bytes = ByteArray(length) {
+        val char = get(it)
+        val code = char.code
+        if (code > Byte.MAX_VALUE) error("Symbol $char is not ASCII symbol") else code.toByte()
+    }
+    return ByteString(bytes)
 }
 
-public fun Output.writeUtf8String(str: String) {
-    writeFully(str.encodeToByteArray())
-}
+public inline fun Buffer(block: Sink.() -> Unit): Buffer = Buffer().apply(block)
 
-public fun Input.readRawString(size: Int): String {
-    return Charsets.ISO_8859_1.newDecoder().decodeExactBytes(this, size)
-}
+//public fun Source.readSafeUtf8Line(): String = readUTF8Line() ?: error("Line not found")
 
-public fun Input.readUtf8String(): String = readBytes().decodeToString()
+public inline fun ByteArray(block: Sink.() -> Unit): ByteArray =
+    Buffer(block).readByteArray()
 
-public fun Input.readSafeUtf8Line(): String = readUTF8Line() ?: error("Line not found")
-
-public inline fun ByteArray(block: Output.() -> Unit): ByteArray =
-    buildPacket(block).readBytes()
-
-public inline fun Binary(block: Output.() -> Unit): Binary =
+public inline fun Binary(block: Sink.() -> Unit): Binary =
     ByteArray(block).asBinary()
 
 public operator fun Binary.get(range: IntRange): Binary = view(range.first, range.last - range.first)
 
 /**
  * Return inferred [EnvelopeFormat] if only one format could read given file. If no format accepts the binary, return null. If
- * multiple formats accepts binary, throw an error.
+ * multiple formats accept binary, throw an error.
  */
 public fun IOPlugin.peekBinaryEnvelopeFormat(binary: Binary): EnvelopeFormat? {
     val formats = envelopeFormatFactories.mapNotNull { factory ->
@@ -56,7 +57,7 @@ public fun IOPlugin.readEnvelope(
     binary: Binary,
     readNonEnvelopes: Boolean = false,
     formatPicker: IOPlugin.(Binary) -> EnvelopeFormat? = IOPlugin::peekBinaryEnvelopeFormat,
-): Envelope = formatPicker(binary)?.readObject(binary) ?: if (readNonEnvelopes) {
+): Envelope = formatPicker(binary)?.readFrom(binary) ?: if (readNonEnvelopes) {
     // if no format accepts file, read it as binary
     Envelope(Meta.EMPTY, binary)
 } else error("Can't infer format for $binary")
@@ -96,74 +97,139 @@ private class RingByteArray(
         else -> inputArray.indices.all { inputArray[it] == get(it) }
     }
 
+    fun contentEquals(byteString: ByteString): Boolean = when {
+        byteString.size != buffer.size -> false
+        size < buffer.size -> false
+        else -> (0 until byteString.size).all { byteString[it] == get(it) }
+    }
+
 }
 
 private fun RingByteArray.toArray(): ByteArray = ByteArray(size) { get(it) }
 
 /**
- * Read [Input] into [output] until designated multibyte [separator] and optionally continues until
+ * Read [Source] into [output] until designated multibyte [separator] and optionally continues until
  * the end of the line after it. Throw error if [separator] not found and [atMost] bytes are read.
  * Also fails if [separator] not found until the end of input.
  *
- * Separator itself is not read into Output.
+ * The Separator itself is not read into [Sink].
  *
  * @param errorOnEof if true error is thrown if separator is never encountered
  *
  * @return bytes actually being read, including separator
  */
-public fun Input.readWithSeparatorTo(
-    output: Output,
-    separator: ByteArray,
+public fun Source.readWithSeparatorTo(
+    output: Sink?,
+    separator: ByteString,
     atMost: Int = Int.MAX_VALUE,
     errorOnEof: Boolean = false,
 ): Int {
     var counter = 0
     val rb = RingByteArray(ByteArray(separator.size))
-    takeWhile { buffer ->
-        while (buffer.canRead()) {
-            val byte = buffer.readByte()
-            counter++
-            if (counter >= atMost) error("Maximum number of bytes to be read $atMost reached.")
-            rb.push(byte)
-            if (rb.contentEquals(separator)) {
-                return counter
-            } else if (rb.isFull()) {
-                output.writeByte(rb[0])
-            }
+
+    while (!exhausted()) {
+        val byte = readByte()
+        counter++
+        if (counter >= atMost) error("Maximum number of bytes to be read $atMost reached.")
+        rb.push(byte)
+        if (rb.contentEquals(separator)) {
+            return counter
+        } else if (rb.isFull()) {
+            output?.writeByte(rb[0])
         }
-        !endOfInput
     }
+
     if (errorOnEof) {
         error("Read to the end of input without encountering ${separator.decodeToString()}")
     } else {
-        for(i in 1 until rb.size){
-            output.writeByte(rb[i])
+        for (i in 1 until rb.size) {
+            output?.writeByte(rb[i])
         }
         counter += (rb.size - 1)
         return counter
     }
 }
 
-public fun Input.discardLine(): Int {
-    return discardUntilDelimiter('\n'.code.toByte()).also {
-        discard(1)
-    }.toInt() + 1
-}
-
-public fun Input.discardWithSeparator(
-    separator: ByteArray,
+/**
+ * Discard all bytes until [separator] is encountered. Separator is discarded sa well.
+ * Return the total number of bytes read.
+ */
+public fun Source.discardWithSeparator(
+    separator: ByteString,
     atMost: Int = Int.MAX_VALUE,
     errorOnEof: Boolean = false,
-): Int {
-    val dummy: Output = object : Output(ChunkBuffer.Pool) {
-        override fun closeDestination() {
-            // Do nothing
-        }
+): Int = readWithSeparatorTo(null, separator, atMost, errorOnEof)
 
-        override fun flush(source: Memory, offset: Int, length: Int) {
-            // Do nothing
-        }
+/**
+ * Discard all symbol until newline is discovered. Carriage return is not discarded.
+ */
+public fun Source.discardLine(
+    atMost: Int = Int.MAX_VALUE,
+    errorOnEof: Boolean = false,
+): Int = discardWithSeparator("\n".encodeToByteString(), atMost, errorOnEof)
+
+
+/**
+ * A [Source] based on [ByteArray]
+ */
+internal class ByteArraySource(
+    private val byteArray: ByteArray,
+    private val offset: Int = 0,
+    private val size: Int = byteArray.size - offset,
+) : RawSource {
+
+    init {
+        require(offset >= 0) { "Offset must be positive" }
+        require(offset + size <= byteArray.size) { "End index is ${offset + size}, but the array size is ${byteArray.size}" }
     }
 
-    return readWithSeparatorTo(dummy, separator, atMost, errorOnEof)
+    private var pointer = offset
+
+    override fun close() {
+        // Do nothing
+    }
+
+    override fun readAtMostTo(sink: Buffer, byteCount: Long): Long {
+        if (pointer == offset + size) return -1
+        val byteRead = min(byteCount.toInt(), (size + offset - pointer))
+        sink.write(byteArray, pointer, pointer + byteRead)
+        pointer += byteRead
+        return byteRead.toLong()
+    }
 }
+
+/**
+ * A [Source] based on [String]
+ */
+public class StringSource(
+    public val string: String,
+    public val offset: Int = 0,
+    public val size: Int = string.length - offset,
+) : RawSource {
+
+    private var pointer = offset
+
+    override fun close() {
+        // Do nothing
+    }
+
+    override fun readAtMostTo(sink: Buffer, byteCount: Long): Long {
+        if (pointer == offset + size) return -1
+        val byteRead = min(byteCount.toInt(), (size + offset - pointer))
+        sink.writeString(string, pointer, pointer + byteRead)
+        pointer += byteRead
+        return byteRead.toLong()
+    }
+}
+
+public fun Sink.writeDouble(value: Double) {
+    writeLong(value.toBits())
+}
+
+public fun Source.readDouble(): Double = Double.fromBits(readLong())
+
+public fun Sink.writeFloat(value: Float) {
+    writeInt(value.toBits())
+}
+
+public fun Source.readFloat(): Float = Float.fromBits(readInt())

dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/BinaryTest.kt

@@ -1,6 +1,5 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.readInt
 import kotlin.test.Test
 import kotlin.test.assertEquals
 

dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/EnvelopeFormatTest.kt

@@ -1,6 +1,7 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.readBytes
+import kotlinx.io.readByteArray
+import kotlinx.io.writeString
 import kotlin.test.Test
 import kotlin.test.assertEquals
 
@@ -12,7 +13,7 @@ class EnvelopeFormatTest {
             "d" put 22.2
         }
         data {
-            writeUtf8String("12345678")
+            writeString("12345678")
         }
     }
 
@@ -22,7 +23,7 @@ class EnvelopeFormatTest {
         val res = readFromByteArray(byteArray)
         assertEquals(envelope.meta, res.meta)
         val bytes = res.data?.read {
-            readBytes()
+            readByteArray()
         }
         assertEquals("12345678", bytes?.decodeToString())
     }
@@ -34,13 +35,13 @@ class EnvelopeFormatTest {
         val res = readFromByteArray(byteArray)
         assertEquals(envelope.meta, res.meta)
         val bytes = res.data?.read {
-            readBytes()
+            readByteArray()
         }
-        assertEquals("12345678",  bytes?.decodeToString())
+        assertEquals("12345678", bytes?.decodeToString())
     }
 
     @Test
-    fun testManualDftl(){
+    fun testManualDftl() {
         val envelopeString = """
             #~DFTL
             #~META
@@ -56,8 +57,8 @@ class EnvelopeFormatTest {
         val res = TaglessEnvelopeFormat.readFromByteArray(envelopeString.encodeToByteArray())
         assertEquals(envelope.meta, res.meta)
         val bytes = res.data?.read {
-            readBytes()
+            readByteArray()
         }
-        assertEquals("12345678",  bytes?.decodeToString())
+        assertEquals("12345678", bytes?.decodeToString())
     }
 }

dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/IOTest.kt

@@ -1,8 +1,9 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.readBytes
-import io.ktor.utils.io.core.readUTF8Line
+import kotlinx.io.buffered
+import kotlinx.io.bytestring.encodeToByteString
+import kotlinx.io.readByteArray
+import kotlinx.io.readLine
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertFails
@@ -11,9 +12,9 @@ class IOTest {
     @Test
     fun readBytes() {
         val bytes = ByteArray(8) { it.toByte() }
-        val input = ByteReadPacket(bytes)
-        @Suppress("UNUSED_VARIABLE") val first = input.readBytes(4)
-        val second = input.readBytes(4)
+        val input = ByteArraySource(bytes).buffered()
+        @Suppress("UNUSED_VARIABLE") val first = input.readByteArray(4)
+        val second = input.readByteArray(4)
         assertEquals(4.toByte(), second[0])
     }
 
@@ -31,25 +32,25 @@ class IOTest {
 
         binary.read {
             val array = ByteArray {
-                val read = readWithSeparatorTo(this, "---".encodeToByteArray()) + discardLine()
+                val read = readWithSeparatorTo(this, "---".encodeToByteString()) + discardLine()
                 assertEquals(12, read)
             }
             assertEquals("""
                 aaa
                 bbb
             """.trimIndent(),array.decodeToString().trim())
-            assertEquals("ccc", readUTF8Line()?.trim())
+            assertEquals("ccc", readLine()?.trim())
         }
 
         assertFails {
             binary.read {
-                discardWithSeparator("---".encodeToByteArray(), atMost = 3 )
+                discardWithSeparator("---".encodeToByteString(), atMost = 3 )
             }
         }
 
         assertFails {
             binary.read{
-                discardWithSeparator("-+-".encodeToByteArray(), errorOnEof = true)
+                discardWithSeparator("-+-".encodeToByteString(), errorOnEof = true)
             }
         }
 

dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MetaFormatTest.kt

@@ -7,11 +7,11 @@ import kotlin.test.assertEquals
 
 
 fun Meta.toByteArray(format: MetaFormat = JsonMetaFormat) = ByteArray {
-    format.writeObject(this@ByteArray, this@toByteArray)
+    format.writeTo(this@ByteArray, this@toByteArray)
 }
 
 fun MetaFormat.fromByteArray(packet: ByteArray): Meta {
-    return packet.asBinary().read { readObject(this) }
+    return packet.asBinary().read { readFrom(this) }
 }
 
 class MetaFormatTest {

dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/MultipartTest.kt

@@ -1,5 +1,6 @@
 package space.kscience.dataforge.io
 
+import kotlinx.io.writeString
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.int
@@ -18,9 +19,9 @@ class MultipartTest {
                 "value" put it
             }
             data {
-                writeUtf8String("Hello World $it")
+                writeString("Hello World $it")
                 repeat(300) {
-                    writeRawString("$it ")
+                    writeString("$it ")
                 }
             }
         }

dataforge-io/src/commonTest/kotlin/space/kscience/dataforge/io/ioTestUtils.kt

@@ -1,12 +1,11 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.ByteReadPacket
-import io.ktor.utils.io.core.use
+import kotlinx.io.buffered
 
 
 fun <T : Any> IOFormat<T>.writeToByteArray(obj: T): ByteArray = ByteArray {
-    writeObject(this, obj)
+    writeTo(this, obj)
 }
-fun <T : Any> IOFormat<T>.readFromByteArray(array: ByteArray): T = ByteReadPacket(array).use {
-    readObject(it)
+fun <T : Any> IOFormat<T>.readFromByteArray(array: ByteArray): T = ByteArraySource(array).buffered().use {
+    readFrom(it)
 }

dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/fileIO.kt

@@ -1,8 +1,11 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.*
-import io.ktor.utils.io.streams.asOutput
+
 import kotlinx.coroutines.runBlocking
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.asSink
+import kotlinx.io.buffered
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.meta.isEmpty
@@ -23,18 +26,18 @@ internal class PathBinary(
     override val size: Int = Files.size(path).toInt() - fileOffset,
 ) : Binary {
 
-    override fun <R> read(offset: Int, atMost: Int, block: Input.() -> R): R = runBlocking {
+    override fun <R> read(offset: Int, atMost: Int, block: Source.() -> R): R = runBlocking {
         readSuspend(offset, atMost, block)
     }
 
-    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Input.() -> R): R {
+    override suspend fun <R> readSuspend(offset: Int, atMost: Int, block: suspend Source.() -> R): R {
         val actualOffset = offset + fileOffset
         val actualSize = min(atMost, size - offset)
         val array = path.inputStream().use {
             it.skip(actualOffset.toLong())
             it.readNBytes(actualSize)
         }
-        return ByteReadPacket(array).block()
+        return ByteArraySource(array).buffered().use { it.block() }
     }
 
     override fun view(offset: Int, binarySize: Int) = PathBinary(path, fileOffset + offset, binarySize)
@@ -42,40 +45,40 @@ internal class PathBinary(
 
 public fun Path.asBinary(): Binary = PathBinary(this)
 
-public fun <R> Path.read(block: Input.() -> R): R = asBinary().read(block = block)
+public fun <R> Path.read(block: Source.() -> R): R = asBinary().read(block = block)
 
 /**
  * Write a live output to a newly created file. If file does not exist, throws error
  */
-public fun Path.write(block: Output.() -> Unit): Unit {
+public fun Path.write(block: Sink.() -> Unit): Unit {
     val stream = Files.newOutputStream(this, StandardOpenOption.WRITE, StandardOpenOption.CREATE_NEW)
-    stream.asOutput().use(block)
+    stream.asSink().buffered().use(block)
 }
 
 /**
  * Create a new file or append to exiting one with given output [block]
  */
-public fun Path.append(block: Output.() -> Unit): Unit {
+public fun Path.append(block: Sink.() -> Unit): Unit {
     val stream = Files.newOutputStream(
         this,
         StandardOpenOption.WRITE, StandardOpenOption.APPEND, StandardOpenOption.CREATE
     )
-    stream.asOutput().use(block)
+    stream.asSink().buffered().use(block)
 }
 
 /**
  * Create a new file or replace existing one using given output [block]
  */
-public fun Path.rewrite(block: Output.() -> Unit): Unit {
+public fun Path.rewrite(block: Sink.() -> Unit): Unit {
     val stream = Files.newOutputStream(
         this,
         StandardOpenOption.WRITE, StandardOpenOption.TRUNCATE_EXISTING, StandardOpenOption.CREATE
     )
-    stream.asOutput().use(block)
+    stream.asSink().buffered().use(block)
 }
 
 @DFExperimental
-public fun EnvelopeFormat.readFile(path: Path): Envelope = readObject(path.asBinary())
+public fun EnvelopeFormat.readFile(path: Path): Envelope = readFrom(path.asBinary())
 
 /**
  * Resolve IOFormat based on type
@@ -235,7 +238,7 @@ public fun IOPlugin.writeEnvelopeFile(
     envelopeFormat: EnvelopeFormat = TaggedEnvelopeFormat,
 ) {
     path.rewrite {
-        envelopeFormat.writeObject(this, envelope)
+        envelopeFormat.writeTo(this, envelope)
     }
 }
 
@@ -260,7 +263,7 @@ public fun IOPlugin.writeEnvelopeDirectory(
     val dataFile = path.resolve(IOPlugin.DATA_FILE_NAME)
     dataFile.write {
         envelope.data?.read {
-            val copied = copyTo(this@write)
+            val copied = transferTo(this@write)
             if (copied != envelope.data?.size?.toLong()) {
                 error("The number of copied bytes does not equal data size")
             }

dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/resourceIO.kt

@@ -1,9 +1,11 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.streams.asInput
+import kotlinx.io.Source
+import kotlinx.io.asSource
+import kotlinx.io.buffered
 
-public fun IOPlugin.resource(name: String): Binary? = context.javaClass.getResource(name)?.readBytes()?.asBinary()
 
-public inline fun <R> IOPlugin.readResource(name: String, block: Input.() -> R): R =
-    context.javaClass.getResource(name)?.openStream()?.asInput()?.block() ?: error("Can't read resource $name")
+public fun IOPlugin.resource(name: String): Binary? = { }.javaClass.getResource(name)?.readBytes()?.asBinary()
+
+public inline fun <R> IOPlugin.readResource(name: String, block: Source.() -> R): R =
+    {  }.javaClass.getResource(name)?.openStream()?.asSource()?.buffered()?.block() ?: error("Can't read resource $name")

dataforge-io/src/jvmMain/kotlin/space/kscience/dataforge/io/workDirectory.kt

@@ -1,7 +1,6 @@
 package space.kscience.dataforge.io
 
 import space.kscience.dataforge.context.ContextBuilder
-import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.meta.set
 import space.kscience.dataforge.meta.string
 import java.nio.file.Path

dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileBinaryTest.kt

@@ -1,6 +1,5 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.writeDouble
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.misc.DFExperimental
 import java.nio.file.Files

dataforge-io/src/jvmTest/kotlin/space/kscience/dataforge/io/FileEnvelopeTest.kt

@@ -1,6 +1,5 @@
 package space.kscience.dataforge.io
 
-import io.ktor.utils.io.core.writeDouble
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.misc.DFExperimental
 import java.nio.file.Files

dataforge-meta/README.md

@@ -6,27 +6,18 @@ Meta definition and basic operations on meta
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-meta:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-meta:0.7.0`.
 
-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-meta:0.6.2-dev-2'
-}
-```
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
+    //uncomment to access development builds
+    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-meta:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-meta:0.7.0")
 }
 ```

dataforge-meta/api/dataforge-meta.api

@@ -45,9 +45,9 @@ public final class space/kscience/dataforge/meta/False : space/kscience/dataforg
 
 public final class space/kscience/dataforge/meta/JsonMetaKt {
 	public static final fun getJSON_ARRAY_KEY (Lspace/kscience/dataforge/meta/Meta$Companion;)Ljava/lang/String;
-	public static final fun toJson (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonObject;
+	public static final fun toJson (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonElement;
 	public static final fun toJson (Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lkotlinx/serialization/json/JsonElement;
-	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonObject;
+	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonElement;
 	public static synthetic fun toJson$default (Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;ILjava/lang/Object;)Lkotlinx/serialization/json/JsonElement;
 	public static final fun toMeta (Lkotlinx/serialization/json/JsonElement;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun toMeta (Lkotlinx/serialization/json/JsonObject;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;)Lspace/kscience/dataforge/meta/SealedMeta;
@@ -59,11 +59,11 @@ public final class space/kscience/dataforge/meta/JsonMetaKt {
 public final class space/kscience/dataforge/meta/Laminate : space/kscience/dataforge/meta/TypedMeta {
 	public static final field Companion Lspace/kscience/dataforge/meta/Laminate$Companion;
 	public fun equals (Ljava/lang/Object;)Z
+	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Laminate;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getItems ()Ljava/util/Map;
 	public final fun getLayers ()Ljava/util/List;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Laminate;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun hashCode ()I
 	public final fun merge ()Lspace/kscience/dataforge/meta/SealedMeta;
@@ -122,8 +122,8 @@ public abstract interface class space/kscience/dataforge/meta/Meta : space/kscie
 	public static final field TYPE Ljava/lang/String;
 	public static final field VALUE_KEY Ljava/lang/String;
 	public abstract fun equals (Ljava/lang/Object;)Z
+	public fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public abstract fun getItems ()Ljava/util/Map;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public abstract fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public abstract fun hashCode ()I
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
@@ -137,10 +137,26 @@ public final class space/kscience/dataforge/meta/Meta$Companion {
 	public final fun equals (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/meta/Meta;)Z
 	public final fun getEMPTY ()Lspace/kscience/dataforge/meta/Meta;
 	public final fun hashCode (Lspace/kscience/dataforge/meta/Meta;)I
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 	public final fun toString (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/String;
 }
 
-public abstract interface annotation class space/kscience/dataforge/meta/MetaBuilder : java/lang/annotation/Annotation {
+public final class space/kscience/dataforge/meta/MetaBuilder : space/kscience/dataforge/meta/MutableMeta {
+	public fun <init> ()V
+	public fun <init> (Lspace/kscience/dataforge/meta/Value;Ljava/util/Map;)V
+	public synthetic fun <init> (Lspace/kscience/dataforge/meta/Value;Ljava/util/Map;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public fun equals (Ljava/lang/Object;)Z
+	public fun getItems ()Ljava/util/Map;
+	public fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MetaBuilder;
+	public synthetic fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
+	public fun hashCode ()I
+	public fun set (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
+	public fun setValue (Lspace/kscience/dataforge/meta/Value;)V
+	public fun toString ()Ljava/lang/String;
+}
+
+public abstract interface annotation class space/kscience/dataforge/meta/MetaBuilderMarker : java/lang/annotation/Annotation {
 }
 
 public final class space/kscience/dataforge/meta/MetaDelegateKt {
@@ -204,11 +220,7 @@ public final class space/kscience/dataforge/meta/MetaKt {
 	public static final fun getIndexed (Lspace/kscience/dataforge/meta/TypedMeta;Lspace/kscience/dataforge/names/Name;)Ljava/util/Map;
 	public static final fun getInt (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Integer;
 	public static final fun getLong (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Long;
-	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/Meta;Ljava/lang/String;)Lspace/kscience/dataforge/meta/Meta;
-	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/Meta;Lspace/kscience/dataforge/names/NameToken;)Lspace/kscience/dataforge/meta/Meta;
-	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/TypedMeta;Ljava/lang/String;)Lspace/kscience/dataforge/meta/TypedMeta;
-	public static final synthetic fun getNonNullable (Lspace/kscience/dataforge/meta/TypedMeta;Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	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;
@@ -223,7 +235,7 @@ public final class space/kscience/dataforge/meta/MetaKt {
 }
 
 public abstract interface class space/kscience/dataforge/meta/MetaProvider : space/kscience/dataforge/meta/ValueProvider {
-	public abstract fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
+	public abstract fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
 	public fun getValue (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Value;
 }
 
@@ -241,9 +253,10 @@ public final class space/kscience/dataforge/meta/MetaSerializer : kotlinx/serial
 }
 
 public abstract interface class space/kscience/dataforge/meta/MutableMeta : space/kscience/dataforge/meta/Meta, space/kscience/dataforge/meta/MutableMetaProvider {
+	public static final field Companion Lspace/kscience/dataforge/meta/MutableMeta$Companion;
+	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/MutableMeta;
 	public abstract fun getItems ()Ljava/util/Map;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
 	public abstract fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
 	public abstract fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun put (Ljava/lang/String;Ljava/lang/Enum;)V
@@ -269,6 +282,10 @@ public abstract interface class space/kscience/dataforge/meta/MutableMeta : spac
 	public fun setValue (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
 }
 
+public final class space/kscience/dataforge/meta/MutableMeta$Companion {
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
+}
+
 public final class space/kscience/dataforge/meta/MutableMetaDelegateKt {
 	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;)Lkotlin/properties/ReadWriteProperty;
 	public static final fun boolean (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function0;)Lkotlin/properties/ReadWriteProperty;
@@ -325,9 +342,9 @@ public final class space/kscience/dataforge/meta/MutableMetaDelegateKt {
 }
 
 public final class space/kscience/dataforge/meta/MutableMetaKt {
-	public static final fun MutableMeta ()Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public static final fun MutableMeta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public static synthetic fun MutableMeta$default (Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public static final fun ObservableMutableMeta ()Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public static final fun ObservableMutableMeta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
+	public static synthetic fun ObservableMutableMeta$default (Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
 	public static final fun append (Lspace/kscience/dataforge/meta/MutableMeta;Ljava/lang/String;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun append (Lspace/kscience/dataforge/meta/MutableMeta;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;)V
 	public static final fun append (Lspace/kscience/dataforge/meta/MutableMeta;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
@@ -343,7 +360,6 @@ public final class space/kscience/dataforge/meta/MutableMetaKt {
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Ljava/lang/Iterable;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Ljava/lang/String;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Ljava/lang/Iterable;)V
-	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableMetaProvider;Lspace/kscience/dataforge/names/NameToken;Lspace/kscience/dataforge/meta/Meta;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableTypedMeta;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
 	public static final fun set (Lspace/kscience/dataforge/meta/MutableValueProvider;Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
@@ -355,8 +371,8 @@ public final class space/kscience/dataforge/meta/MutableMetaKt {
 }
 
 public abstract interface class space/kscience/dataforge/meta/MutableMetaProvider : space/kscience/dataforge/meta/MetaProvider, space/kscience/dataforge/meta/MutableValueProvider {
-	public abstract fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
-	public abstract fun setMeta (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
+	public abstract fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public abstract fun set (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
 	public abstract fun setValue (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
 }
 
@@ -370,7 +386,7 @@ public final class space/kscience/dataforge/meta/MutableMetaSerializer : kotlinx
 }
 
 public abstract interface class space/kscience/dataforge/meta/MutableTypedMeta : space/kscience/dataforge/meta/MutableMeta, space/kscience/dataforge/meta/TypedMeta {
-	public abstract fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
+	public abstract fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
 	public abstract fun getOrCreate (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
 }
 
@@ -413,11 +429,11 @@ public final class space/kscience/dataforge/meta/ObservableMetaWrapperKt {
 }
 
 public abstract interface class space/kscience/dataforge/meta/ObservableMutableMeta : space/kscience/dataforge/meta/MutableMeta, space/kscience/dataforge/meta/MutableTypedMeta, space/kscience/dataforge/meta/ObservableMeta {
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public synthetic fun get (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableTypedMeta;
+	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;
 }
 
@@ -429,12 +445,12 @@ public abstract interface class space/kscience/dataforge/meta/ReadOnlySpecificat
 
 public class space/kscience/dataforge/meta/Scheme : space/kscience/dataforge/meta/Configurable, space/kscience/dataforge/meta/MetaRepr, space/kscience/dataforge/meta/MutableMetaProvider, space/kscience/dataforge/meta/descriptors/Described {
 	public fun <init> ()V
+	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/MutableMeta;
 	public final fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 	public synthetic fun getMeta ()Lspace/kscience/dataforge/meta/MutableMeta;
 	public final fun getMeta ()Lspace/kscience/dataforge/meta/ObservableMutableMeta;
-	public synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/MutableMeta;
-	public fun setMeta (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
+	public fun set (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Meta;)V
 	public fun setValue (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/Value;)V
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Laminate;
 	public synthetic fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
@@ -463,13 +479,12 @@ public class space/kscience/dataforge/meta/SchemeSpec : space/kscience/dataforge
 
 public final class space/kscience/dataforge/meta/SealedMeta : space/kscience/dataforge/meta/TypedMeta {
 	public static final field Companion Lspace/kscience/dataforge/meta/SealedMeta$Companion;
-	public synthetic fun <init> (ILspace/kscience/dataforge/meta/Value;Ljava/util/Map;Lkotlinx/serialization/internal/SerializationConstructorMarker;)V
+	public fun <init> (Lspace/kscience/dataforge/meta/Value;Ljava/util/Map;)V
 	public fun equals (Ljava/lang/Object;)Z
 	public fun getItems ()Ljava/util/Map;
 	public fun getValue ()Lspace/kscience/dataforge/meta/Value;
 	public fun hashCode ()I
 	public fun toString ()Ljava/lang/String;
-	public static final synthetic fun write$Self (Lspace/kscience/dataforge/meta/SealedMeta;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
 }
 
 public final class space/kscience/dataforge/meta/SealedMeta$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
@@ -490,9 +505,13 @@ public final class space/kscience/dataforge/meta/SealedMeta$Companion {
 public final class space/kscience/dataforge/meta/SealedMetaKt {
 	public static final fun Meta (Ljava/lang/Number;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun Meta (Ljava/lang/String;)Lspace/kscience/dataforge/meta/SealedMeta;
-	public static final fun Meta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/SealedMeta;
+	public static final fun Meta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/Meta;
 	public static final fun Meta (Lspace/kscience/dataforge/meta/Value;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun Meta (Z)Lspace/kscience/dataforge/meta/SealedMeta;
+	public static final fun MutableMeta ()Lspace/kscience/dataforge/meta/MutableMeta;
+	public static final fun MutableMeta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public static synthetic fun MutableMeta$default (Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/MutableMeta;
+	public static final fun SealedMeta (Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/SealedMeta;
 	public static final fun seal (Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/SealedMeta;
 }
 
@@ -541,9 +560,9 @@ public final class space/kscience/dataforge/meta/True : space/kscience/dataforge
 }
 
 public abstract interface class space/kscience/dataforge/meta/TypedMeta : space/kscience/dataforge/meta/Meta {
+	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 synthetic fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/Meta;
-	public fun getMeta (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/meta/TypedMeta;
 	public fun toMeta ()Lspace/kscience/dataforge/meta/Meta;
 }
 
@@ -561,6 +580,8 @@ public abstract interface class space/kscience/dataforge/meta/Value {
 public final class space/kscience/dataforge/meta/Value$Companion {
 	public static final field TYPE Ljava/lang/String;
 	public final fun of (Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Value;
+	public final fun parse (Ljava/lang/String;)Lspace/kscience/dataforge/meta/Value;
+	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
 
 public final class space/kscience/dataforge/meta/ValueExtensionsKt {
@@ -635,21 +656,11 @@ public final class space/kscience/dataforge/meta/ValueType : java/lang/Enum {
 	public static final field NULL Lspace/kscience/dataforge/meta/ValueType;
 	public static final field NUMBER Lspace/kscience/dataforge/meta/ValueType;
 	public static final field STRING Lspace/kscience/dataforge/meta/ValueType;
+	public static fun getEntries ()Lkotlin/enums/EnumEntries;
 	public static fun valueOf (Ljava/lang/String;)Lspace/kscience/dataforge/meta/ValueType;
 	public static fun values ()[Lspace/kscience/dataforge/meta/ValueType;
 }
 
-public final class space/kscience/dataforge/meta/ValueType$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
-	public static final field INSTANCE Lspace/kscience/dataforge/meta/ValueType$$serializer;
-	public 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/ValueType;
-	public 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/ValueType;)V
-	public fun typeParametersSerializers ()[Lkotlinx/serialization/KSerializer;
-}
-
 public final class space/kscience/dataforge/meta/ValueType$Companion {
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
@@ -661,34 +672,30 @@ public abstract interface class space/kscience/dataforge/meta/descriptors/Descri
 public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor {
 	public static final field Companion Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor$Companion;
 	public fun <init> ()V
-	public synthetic fun <init> (ILjava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;Lkotlinx/serialization/internal/SerializationConstructorMarker;)V
-	public fun <init> (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;)V
-	public synthetic fun <init> (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
+	public fun <init> (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRestriction;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/Meta;)V
+	public synthetic fun <init> (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRestriction;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/Meta;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
 	public final fun component1 ()Ljava/lang/String;
 	public final fun component2 ()Ljava/util/Map;
 	public final fun component3 ()Z
-	public final fun component4 ()Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
+	public final fun component4 ()Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 	public final fun component5 ()Ljava/util/List;
 	public final fun component6 ()Ljava/lang/String;
 	public final fun component7 ()Lspace/kscience/dataforge/meta/Value;
-	public final fun component8 ()Z
-	public final fun component9 ()Lspace/kscience/dataforge/meta/Meta;
-	public final fun copy (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
-	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRequirement;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;ZLspace/kscience/dataforge/meta/Meta;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+	public final fun component8 ()Lspace/kscience/dataforge/meta/Meta;
+	public final fun copy (Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRestriction;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/Meta;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+	public static synthetic fun copy$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Ljava/lang/String;Ljava/util/Map;ZLspace/kscience/dataforge/meta/descriptors/ValueRestriction;Ljava/util/List;Ljava/lang/String;Lspace/kscience/dataforge/meta/Value;Lspace/kscience/dataforge/meta/Meta;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 	public fun equals (Ljava/lang/Object;)Z
 	public final fun getAttributes ()Lspace/kscience/dataforge/meta/Meta;
 	public final fun getChildren ()Ljava/util/Map;
 	public final fun getDefaultNode ()Lspace/kscience/dataforge/meta/Meta;
 	public final fun getDefaultValue ()Lspace/kscience/dataforge/meta/Value;
+	public final fun getDescription ()Ljava/lang/String;
 	public final fun getIndexKey ()Ljava/lang/String;
-	public final fun getInfo ()Ljava/lang/String;
 	public final fun getMultiple ()Z
-	public final fun getReadOnly ()Z
-	public final fun getValueRequirement ()Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
+	public final fun getValueRestriction ()Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 	public final fun getValueTypes ()Ljava/util/List;
 	public fun hashCode ()I
 	public fun toString ()Ljava/lang/String;
-	public static final synthetic fun write$Self (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlinx/serialization/encoding/CompositeEncoder;Lkotlinx/serialization/descriptors/SerialDescriptor;)V
 }
 
 public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor$$serializer : kotlinx/serialization/internal/GeneratedSerializer {
@@ -703,6 +710,7 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor$$ser
 }
 
 public final class space/kscience/dataforge/meta/descriptors/MetaDescriptor$Companion {
+	public final fun getEMPTY ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
 	public final fun serializer ()Lkotlinx/serialization/KSerializer;
 }
 
@@ -719,9 +727,8 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuild
 	public final fun getIndexKey ()Ljava/lang/String;
 	public final fun getInfo ()Ljava/lang/String;
 	public final fun getMultiple ()Z
-	public final fun getReadOnly ()Z
-	public final fun getType ()Ljava/util/List;
-	public final fun getValueRequirement ()Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
+	public final fun getValueRestriction ()Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
+	public final fun getValueTypes ()Ljava/util/List;
 	public final fun item (Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
 	public static synthetic fun item$default (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;Lspace/kscience/dataforge/names/Name;Lkotlin/jvm/functions/Function1;ILjava/lang/Object;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
 	public final fun node (Lspace/kscience/dataforge/names/Name;Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lkotlin/jvm/functions/Function1;)Lspace/kscience/dataforge/meta/descriptors/MetaDescriptorBuilder;
@@ -733,10 +740,9 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuild
 	public final fun setIndexKey (Ljava/lang/String;)V
 	public final fun setInfo (Ljava/lang/String;)V
 	public final fun setMultiple (Z)V
-	public final fun setReadOnly (Z)V
-	public final fun setType (Ljava/util/List;)V
-	public final fun setValueRequirement (Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;)V
-	public final fun type (Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;)V
+	public final fun setValueRestriction (Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;)V
+	public final fun setValueTypes (Ljava/util/List;)V
+	public final fun valueType (Lspace/kscience/dataforge/meta/ValueType;[Lspace/kscience/dataforge/meta/ValueType;)V
 }
 
 public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorBuilderKt {
@@ -764,12 +770,13 @@ public final class space/kscience/dataforge/meta/descriptors/MetaDescriptorKt {
 	public static final fun validate (Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;Lspace/kscience/dataforge/meta/Value;)Z
 }
 
-public final class space/kscience/dataforge/meta/descriptors/ValueRequirement : java/lang/Enum {
-	public static final field ABSENT Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
-	public static final field NONE Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
-	public static final field REQUIRED Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
-	public static fun valueOf (Ljava/lang/String;)Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
-	public static fun values ()[Lspace/kscience/dataforge/meta/descriptors/ValueRequirement;
+public final class space/kscience/dataforge/meta/descriptors/ValueRestriction : java/lang/Enum {
+	public static final field ABSENT Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
+	public static final field NONE Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
+	public static final field REQUIRED Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
+	public static fun getEntries ()Lkotlin/enums/EnumEntries;
+	public static fun valueOf (Ljava/lang/String;)Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
+	public static fun values ()[Lspace/kscience/dataforge/meta/descriptors/ValueRestriction;
 }
 
 public final class space/kscience/dataforge/meta/transformations/KeepTransformationRule : space/kscience/dataforge/meta/transformations/TransformationRule {
@@ -788,7 +795,10 @@ public final class space/kscience/dataforge/meta/transformations/KeepTransformat
 
 public abstract interface class space/kscience/dataforge/meta/transformations/MetaConverter {
 	public static final field Companion Lspace/kscience/dataforge/meta/transformations/MetaConverter$Companion;
-	public abstract fun metaToObject (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public fun getDescriptor ()Lspace/kscience/dataforge/meta/descriptors/MetaDescriptor;
+	public abstract fun getType ()Lkotlin/reflect/KType;
+	public fun metaToObject (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
+	public abstract fun metaToObjectOrNull (Lspace/kscience/dataforge/meta/Meta;)Ljava/lang/Object;
 	public abstract fun objectToMeta (Ljava/lang/Object;)Lspace/kscience/dataforge/meta/Meta;
 }
 
@@ -893,6 +903,10 @@ public abstract interface annotation class space/kscience/dataforge/misc/DFExper
 public abstract interface annotation class space/kscience/dataforge/misc/DFInternal : java/lang/annotation/Annotation {
 }
 
+public abstract interface annotation class space/kscience/dataforge/misc/DfId : java/lang/annotation/Annotation {
+	public abstract fun id ()Ljava/lang/String;
+}
+
 public abstract interface class space/kscience/dataforge/misc/Named {
 	public static final field Companion Lspace/kscience/dataforge/misc/Named$Companion;
 	public abstract fun getName ()Lspace/kscience/dataforge/names/Name;
@@ -906,10 +920,6 @@ public final class space/kscience/dataforge/misc/NamedKt {
 	public static final fun isAnonymous (Lspace/kscience/dataforge/misc/Named;)Z
 }
 
-public abstract interface annotation class space/kscience/dataforge/misc/Type : java/lang/annotation/Annotation {
-	public abstract fun id ()Ljava/lang/String;
-}
-
 public final class space/kscience/dataforge/names/Name {
 	public static final field Companion Lspace/kscience/dataforge/names/Name$Companion;
 	public static final field NAME_SEPARATOR Ljava/lang/String;
@@ -944,6 +954,7 @@ public final class space/kscience/dataforge/names/NameKt {
 	public static synthetic fun get$default (Ljava/util/Map;Ljava/lang/String;Ljava/lang/String;ILjava/lang/Object;)Ljava/lang/Object;
 	public static final fun getLength (Lspace/kscience/dataforge/names/Name;)I
 	public static final fun isEmpty (Lspace/kscience/dataforge/names/Name;)Z
+	public static final fun last (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/names/NameToken;
 	public static final fun lastOrNull (Lspace/kscience/dataforge/names/Name;)Lspace/kscience/dataforge/names/NameToken;
 	public static final fun parseAsName (Ljava/lang/String;Z)Lspace/kscience/dataforge/names/Name;
 	public static synthetic fun parseAsName$default (Ljava/lang/String;ZILjava/lang/Object;)Lspace/kscience/dataforge/names/Name;

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

@@ -81,7 +81,7 @@ public fun JsonPrimitive.toValue(descriptor: MetaDescriptor?): Value = when (thi
             content.asValue()
         } else {
             //consider using LazyParse
-            content.parseValue()
+            Value.parse(content)
         }
     }
 }

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

@@ -17,8 +17,8 @@ public class Laminate internal constructor(public val layers: List<Meta>) : Type
         }
     }
 
-    override fun getMeta(name: Name): Laminate? {
-        val childLayers = layers.mapNotNull { it.getMeta(name) }
+    override fun get(name: Name): Laminate? {
+        val childLayers = layers.mapNotNull { it.get(name) }
         return if (childLayers.isEmpty()) null else Laminate(childLayers)
     }
 

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

@@ -2,7 +2,7 @@ package space.kscience.dataforge.meta
 
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.misc.unsafeCast
 import space.kscience.dataforge.names.*
 import kotlin.jvm.JvmName
@@ -21,9 +21,9 @@ public interface MetaRepr {
  * A container for meta nodes
  */
 public fun interface MetaProvider : ValueProvider {
-    public fun getMeta(name: Name): Meta?
+    public operator fun get(name: Name): Meta?
 
-    override fun getValue(name: Name): Value? = getMeta(name)?.value
+    override fun getValue(name: Name): Value? = get(name)?.value
 }
 
 /**
@@ -31,13 +31,13 @@ public fun interface MetaProvider : ValueProvider {
  * TODO add documentation
  * Same name siblings are supported via elements with the same [Name] but different indices.
  */
-@Type(Meta.TYPE)
+@DfId(Meta.TYPE)
 @Serializable(MetaSerializer::class)
 public interface Meta : MetaRepr, MetaProvider {
     public val value: Value?
     public val items: Map<NameToken, Meta>
 
-    override fun getMeta(name: Name): Meta? {
+    override fun get(name: Name): Meta? {
         tailrec fun Meta.find(name: Name): Meta? = if (name.isEmpty()) {
             this
         } else {
@@ -50,7 +50,9 @@ public interface Meta : MetaRepr, MetaProvider {
     override fun toMeta(): Meta = this
 
     override fun toString(): String
+
     override fun equals(other: Any?): Boolean
+
     override fun hashCode(): Int
 
     public companion object {
@@ -106,21 +108,13 @@ public operator fun Meta.get(token: NameToken): Meta? = items[token]
  *
  * If [name] is empty return current [Meta]
  */
-public operator fun Meta?.get(name: Name): Meta? = this?.getMeta(name)
-
-@Deprecated("Use nullable receiver", level = DeprecationLevel.HIDDEN)
-@JvmName("getNonNullable")
-public operator fun Meta.get(name: Name): Meta? = getMeta(name)
+public operator fun Meta?.get(name: Name): Meta? = this?.get(name)
 
 /**
  * Parse [Name] from [key] using full name notation and pass it to [Meta.get]
  */
 public operator fun Meta?.get(key: String): Meta? = this?.get(key.parseAsName(true))
 
-@Deprecated("Use nullable receiver", level = DeprecationLevel.HIDDEN)
-@JvmName("getNonNullable")
-public operator fun Meta.get(key: String): Meta? = get(key.parseAsName(true))
-
 /**
  * Get all items matching given name. The index of the last element, if present is used as a [Regex],
  * against which indexes of elements are matched.
@@ -157,7 +151,7 @@ public interface TypedMeta<out M : TypedMeta<M>> : Meta {
 
     override val items: Map<NameToken, M>
 
-    override fun getMeta(name: Name): M? {
+    override fun get(name: Name): M? {
         tailrec fun M.find(name: Name): M? = if (name.isEmpty()) {
             this
         } else {
@@ -180,28 +174,17 @@ public inline val <M : TypedMeta<M>> TypedMeta<M>.self: M get() = unsafeCast()
 public operator fun <M : TypedMeta<M>> TypedMeta<M>?.get(token: NameToken): M? = this?.items?.get(token)
 
 /**
- * Perform recursive item search using given [name]. Each [NameToken] is treated as a name in [TypedMeta.items] of a parent node.
+ * Retrieves a meta node with the given name from the nullable [TypedMeta] object.
  *
- * If [name] is empty return current [Meta]
+ * @param name The name of the meta node to retrieve.
+ * @return The meta node with the given name, or null if it doesn't exist.
  */
-public tailrec operator fun <M : TypedMeta<M>> TypedMeta<M>?.get(name: Name): M? = when {
-    this == null -> null
-    name.isEmpty() -> self
-    else -> get(name.firstOrNull()!!)?.get(name.cutFirst())
-}
-
-@Deprecated("Use nullable receiver", level = DeprecationLevel.HIDDEN)
-@JvmName("getNonNullable")
-public operator fun <M : TypedMeta<M>> TypedMeta<M>.get(name: Name): M? = get(name)
+public operator fun <M : TypedMeta<M>> M?.get(name: Name): M? = this?.get(name)
 
 /**
  * Parse [Name] from [key] using full name notation and pass it to [TypedMeta.get]
  */
-public operator fun <M : TypedMeta<M>> TypedMeta<M>?.get(key: String): M? = this[key.parseAsName(true)]
-
-@Deprecated("Use nullable receiver", level = DeprecationLevel.HIDDEN)
-@JvmName("getNonNullable")
-public operator fun <M : TypedMeta<M>> TypedMeta<M>.get(key: String): M? = get(key)
+public operator fun <M : TypedMeta<M>> M?.get(key: String): M? = this?.get(key.parseAsName(true))
 
 
 /**

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

@@ -8,28 +8,28 @@ import kotlin.properties.ReadOnlyProperty
 /* Meta delegates */
 
 public fun MetaProvider.node(key: Name? = null): ReadOnlyProperty<Any?, Meta?> = ReadOnlyProperty { _, property ->
-    getMeta(key ?: property.name.asName())
+    get(key ?: property.name.asName())
 }
 
 public fun <T> MetaProvider.node(
     key: Name? = null,
     converter: MetaConverter<T>
 ): ReadOnlyProperty<Any?, T?> = ReadOnlyProperty { _, property ->
-    getMeta(key ?: property.name.asName())?.let { converter.metaToObject(it) }
+    get(key ?: property.name.asName())?.let { converter.metaToObject(it) }
 }
 
 /**
  * A property delegate that uses custom key
  */
 public fun MetaProvider.value(key: Name? = null): ReadOnlyProperty<Any?, Value?> = ReadOnlyProperty { _, property ->
-    getMeta(key ?: property.name.asName())?.value
+    get(key ?: property.name.asName())?.value
 }
 
 public fun <R> MetaProvider.value(
     key: Name? = null,
     reader: (Value?) -> R
 ): ReadOnlyProperty<Any?, R> = ReadOnlyProperty { _, property ->
-    reader(getMeta(key ?: property.name.asName())?.value)
+    reader(get(key ?: property.name.asName())?.value)
 }
 
 //TODO add caching for sealed nodes

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

@@ -11,14 +11,14 @@ import kotlin.js.JsName
  * Mark a meta builder
  */
 @DslMarker
-public annotation class MetaBuilder
+public annotation class MetaBuilderMarker
 
 /**
  * A generic interface that gives access to getting and setting meta notes and values
  */
 public interface MutableMetaProvider : MetaProvider, MutableValueProvider {
-    override fun getMeta(name: Name): MutableMeta?
-    public fun setMeta(name: Name, node: Meta?)
+    override fun get(name: Name): MutableMeta?
+    public operator fun set(name: Name, node: Meta?)
     override fun setValue(name: Name, value: Value?)
 }
 
@@ -27,7 +27,7 @@ public interface MutableMetaProvider : MetaProvider, MutableValueProvider {
  * TODO documentation
  */
 @Serializable(MutableMetaSerializer::class)
-@MetaBuilder
+@MetaBuilderMarker
 public interface MutableMeta : Meta, MutableMetaProvider {
 
     override val items: Map<NameToken, MutableMeta>
@@ -37,7 +37,7 @@ public interface MutableMeta : Meta, MutableMetaProvider {
      */
     override var value: Value?
 
-    override fun getMeta(name: Name): MutableMeta? {
+    override fun get(name: Name): MutableMeta? {
         tailrec fun MutableMeta.find(name: Name): MutableMeta? = if (name.isEmpty()) {
             this
         } else {
@@ -83,19 +83,19 @@ public interface MutableMeta : Meta, MutableMetaProvider {
     }
 
     public infix fun Name.put(meta: Meta) {
-        setMeta(this, meta)
+        set(this, meta)
     }
 
     public infix fun Name.put(repr: MetaRepr) {
-        setMeta(this, repr.toMeta())
+        set(this, repr.toMeta())
     }
 
-    public infix fun Name.put(mutableMeta: MutableMeta.() -> Unit) {
-        setMeta(this, Meta(mutableMeta))
+    public infix fun Name.put(builder: MutableMeta.() -> Unit) {
+        getOrCreate(this).apply(builder)
     }
 
     public infix fun String.put(meta: Meta) {
-        setMeta(Name.parse(this), meta)
+        set(Name.parse(this), meta)
     }
 
     public infix fun String.put(value: Value?) {
@@ -123,7 +123,7 @@ public interface MutableMeta : Meta, MutableMetaProvider {
     }
 
     public infix fun String.put(repr: MetaRepr) {
-        setMeta(Name.parse(this), repr.toMeta())
+        set(Name.parse(this), repr.toMeta())
     }
 
     public infix fun String.putIndexed(iterable: Iterable<Meta>) {
@@ -131,15 +131,10 @@ public interface MutableMeta : Meta, MutableMetaProvider {
     }
 
     public infix fun String.put(builder: MutableMeta.() -> Unit) {
-        setMeta(Name.parse(this), MutableMeta(builder))
+        getOrCreate(parseAsName()).apply(builder)
     }
 }
 
-/**
- * Set or replace node at given [name]
- */
-public operator fun MutableMetaProvider.set(name: Name, meta: Meta): Unit = setMeta(name, meta)
-
 /**
  * Set or replace value at given [name]
  */
@@ -154,24 +149,24 @@ public interface MutableTypedMeta<M : MutableTypedMeta<M>> : TypedMeta<M>, Mutab
      */
     @DFExperimental
     public fun attach(name: Name, node: M)
-    override fun getMeta(name: Name): M?
+    override fun get(name: Name): M?
     override fun getOrCreate(name: Name): M
 }
 
 public fun <M : MutableTypedMeta<M>> M.getOrCreate(key: String): M = getOrCreate(Name.parse(key))
 
 public fun MutableMetaProvider.remove(name: Name) {
-    setMeta(name, null)
+    set(name, null)
 }
 
 public fun MutableMetaProvider.remove(key: String) {
-    setMeta(Name.parse(key), null)
+    set(Name.parse(key), null)
 }
 
 // node setters
 
-public operator fun MutableMetaProvider.set(Key: NameToken, value: Meta): Unit = setMeta(Key.asName(), value)
-public operator fun MutableMetaProvider.set(key: String, value: Meta): Unit = setMeta(Name.parse(key), value)
+public operator fun MutableMetaProvider.set(Key: NameToken, value: Meta): Unit = set(Key.asName(), value)
+public operator fun MutableMetaProvider.set(key: String, value: Meta): Unit = set(Name.parse(key), value)
 
 
 //public fun MutableMeta.set(key: String, index: String, value: Value?): Unit =
@@ -319,7 +314,7 @@ private class MutableMetaImpl(
         )
 
     @ThreadSafe
-    override fun setMeta(name: Name, node: Meta?) {
+    override fun set(name: Name, node: Meta?) {
         val oldItem: ObservableMutableMeta? = get(name)
         if (oldItem != node) {
             when (name.length) {
@@ -346,7 +341,7 @@ private class MutableMetaImpl(
                         newNode.adoptBy(this, token)
                         children[token] = newNode
                     }
-                    items[token]?.setMeta(name.cutFirst(), node)
+                    items[token]?.set(name.cutFirst(), node)
                 }
             }
             invalidate(name)
@@ -381,16 +376,14 @@ public fun Meta.toMutableMeta(): ObservableMutableMeta = MutableMetaImpl(value,
 
 public fun Meta.asMutableMeta(): MutableMeta = (this as? MutableMeta) ?: toMutableMeta()
 
-@Suppress("FunctionName")
-@JsName("newMutableMeta")
-public fun MutableMeta(): ObservableMutableMeta = MutableMetaImpl(null)
+@JsName("newObservableMutableMeta")
+public fun ObservableMutableMeta(): ObservableMutableMeta = MutableMetaImpl(null)
 
 /**
  * Build a [MutableMeta] using given transformation
  */
-@Suppress("FunctionName")
-public inline fun MutableMeta(builder: MutableMeta.() -> Unit = {}): ObservableMutableMeta =
-    MutableMeta().apply(builder)
+public inline fun ObservableMutableMeta(builder: MutableMeta.() -> Unit = {}): ObservableMutableMeta =
+    ObservableMutableMeta().apply(builder)
 
 
 /**
@@ -407,7 +400,7 @@ private class MutableMetaWithDefault(
     override val items: Map<NameToken, MutableMeta>
         get() {
             val sourceKeys: Collection<NameToken> = source[rootName]?.items?.keys ?: emptyList()
-            val defaultKeys: Collection<NameToken> = default.getMeta(rootName)?.items?.keys ?: emptyList()
+            val defaultKeys: Collection<NameToken> = default[rootName]?.items?.keys ?: emptyList()
             //merging keys for primary and default node
             return (sourceKeys + defaultKeys).associateWith {
                 MutableMetaWithDefault(source, default, rootName + it)
@@ -415,12 +408,12 @@ private class MutableMetaWithDefault(
         }
 
     override var value: Value?
-        get() = source[rootName]?.value ?: default.getMeta(rootName)?.value
+        get() = source[rootName]?.value ?: default.get(rootName)?.value
         set(value) {
             source[rootName] = value
         }
 
-    override fun getMeta(name: Name): MutableMeta = MutableMetaWithDefault(source, default, rootName + name)
+    override fun get(name: Name): MutableMeta = MutableMetaWithDefault(source, default, rootName + name)
 
     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/MutableMetaDelegate.kt

@@ -11,31 +11,31 @@ import kotlin.reflect.KProperty
 public fun MutableMetaProvider.node(key: Name? = null): ReadWriteProperty<Any?, Meta?> =
     object : ReadWriteProperty<Any?, Meta?> {
         override fun getValue(thisRef: Any?, property: KProperty<*>): Meta? {
-            return getMeta(key ?: property.name.asName())
+            return get(key ?: property.name.asName())
         }
 
         override fun setValue(thisRef: Any?, property: KProperty<*>, value: Meta?) {
             val name = key ?: property.name.asName()
-            setMeta(name, value)
+            set(name, value)
         }
     }
 
 public fun <T> MutableMetaProvider.node(key: Name? = null, converter: MetaConverter<T>): ReadWriteProperty<Any?, T?> =
     object : ReadWriteProperty<Any?, T?> {
         override fun getValue(thisRef: Any?, property: KProperty<*>): T? {
-            return getMeta(key ?: property.name.asName())?.let { converter.metaToObject(it) }
+            return get(key ?: property.name.asName())?.let { converter.metaToObject(it) }
         }
 
         override fun setValue(thisRef: Any?, property: KProperty<*>, value: T?) {
             val name = key ?: property.name.asName()
-            setMeta(name, value?.let { converter.objectToMeta(it) })
+            set(name, value?.let { converter.objectToMeta(it) })
         }
     }
 
 public fun MutableMetaProvider.value(key: Name? = null): ReadWriteProperty<Any?, Value?> =
     object : ReadWriteProperty<Any?, Value?> {
         override fun getValue(thisRef: Any?, property: KProperty<*>): Value? =
-            getMeta(key ?: property.name.asName())?.value
+            get(key ?: property.name.asName())?.value
 
         override fun setValue(thisRef: Any?, property: KProperty<*>, value: Value?) {
             setValue(key ?: property.name.asName(), value)
@@ -48,7 +48,7 @@ public fun <T> MutableMetaProvider.value(
     reader: (Value?) -> T
 ): ReadWriteProperty<Any?, T> = object : ReadWriteProperty<Any?, T> {
     override fun getValue(thisRef: Any?, property: KProperty<*>): T =
-        reader(getMeta(key ?: property.name.asName())?.value)
+        reader(get(key ?: property.name.asName())?.value)
 
     override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) {
         setValue(key ?: property.name.asName(), writer(value))

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

@@ -36,7 +36,7 @@ public interface ObservableMeta : Meta {
 public interface ObservableMutableMeta : ObservableMeta, MutableMeta, MutableTypedMeta<ObservableMutableMeta> {
     override fun getOrCreate(name: Name): ObservableMutableMeta
 
-    override fun getMeta(name: Name): ObservableMutableMeta? {
+    override fun get(name: Name): ObservableMutableMeta? {
         tailrec fun ObservableMutableMeta.find(name: Name): ObservableMutableMeta? = if (name.isEmpty()) {
             this
         } else {

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

@@ -17,8 +17,8 @@ private class ObservableMetaWrapper(
             ObservableMetaWrapper(root, absoluteName + it, listeners)
         }
 
-    override fun getMeta(name: Name): ObservableMutableMeta? =
-        root.getMeta(name)?.let { ObservableMetaWrapper(root, this.absoluteName + name, listeners) }
+    override fun get(name: Name): ObservableMutableMeta? =
+        root.get(name)?.let { ObservableMetaWrapper(root, this.absoluteName + name, listeners) }
 
     @ThreadSafe
     override fun onChange(owner: Any?, callback: Meta.(name: Name) -> Unit) {
@@ -49,9 +49,11 @@ private class ObservableMetaWrapper(
     override fun getOrCreate(name: Name): ObservableMutableMeta =
         ObservableMetaWrapper(root, this.absoluteName + name, listeners)
 
-    override fun setMeta(name: Name, node: Meta?) {
+    override fun set(name: Name, node: Meta?) {
         val oldMeta = get(name)
-        root.setMeta(absoluteName + name, node)
+        //don't forget to remove listener
+        oldMeta?.removeListener(this)
+        root.set(absoluteName + name, node)
         if (oldMeta != node) {
             invalidate(name)
         }
@@ -67,7 +69,7 @@ private class ObservableMetaWrapper(
     override fun attach(name: Name, node: ObservableMutableMeta) {
         set(name, node)
         node.onChange(this) { changeName ->
-            setMeta(name + changeName, this[changeName])
+            set(name + changeName, this[changeName])
         }
     }
 }

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

@@ -47,11 +47,11 @@ public open class Scheme : Described, MetaRepr, MutableMetaProvider, Configurabl
         return descriptor?.validate(meta) ?: true
     }
 
-    override fun getMeta(name: Name): MutableMeta? = meta.getMeta(name)
+    override fun get(name: Name): MutableMeta? = meta.get(name)
 
-    override fun setMeta(name: Name, node: Meta?) {
+    override fun set(name: Name, node: Meta?) {
         if (validate(name, meta)) {
-            meta.setMeta(name, node)
+            meta.set(name, node)
         } else {
             error("Validation failed for node $node at $name")
         }
@@ -110,8 +110,8 @@ public open class Scheme : Described, MetaRepr, MutableMetaProvider, Configurabl
         override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
         override fun hashCode(): Int = Meta.hashCode(this)
 
-        override fun setMeta(name: Name, node: Meta?) {
-            targetMeta.setMeta(name, node)
+        override fun set(name: Name, node: Meta?) {
+            targetMeta.set(name, node)
             invalidate(name)
         }
 
@@ -120,9 +120,9 @@ public open class Scheme : Described, MetaRepr, MutableMetaProvider, Configurabl
         @DFExperimental
         override fun attach(name: Name, node: ObservableMutableMeta) {
             //TODO implement zero-copy attachment
-            setMeta(name, node)
+            set(name, node)
             node.onChange(this) { changeName ->
-                setMeta(name + changeName, this[changeName])
+                set(name + changeName, this[changeName])
             }
         }
 

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

@@ -1,16 +1,17 @@
 package space.kscience.dataforge.meta
 
 import kotlinx.serialization.Serializable
-import space.kscience.dataforge.names.NameToken
+import space.kscience.dataforge.names.*
+import kotlin.js.JsName
 
 /**
  * The meta implementation which is guaranteed to be immutable.
  *
  */
 @Serializable
-public class SealedMeta internal constructor(
+public class SealedMeta(
     override val value: Value?,
-    override val items: Map<NameToken, SealedMeta>
+    override val items: Map<NameToken, SealedMeta>,
 ) : TypedMeta<SealedMeta> {
     override fun toString(): String = Meta.toString(this)
     override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
@@ -26,7 +27,7 @@ public class SealedMeta internal constructor(
 }
 
 /**
- * Generate sealed node from [this]. If it is already sealed return it as is.
+ * Generate sealed node from [this]. If it is already sealed, return it as is.
  */
 public fun Meta.seal(): SealedMeta = this as? SealedMeta ?: SealedMeta(
     value,
@@ -47,7 +48,79 @@ public fun Meta(value: String): SealedMeta = Meta(value.asValue())
 @Suppress("FunctionName")
 public fun Meta(value: Boolean): SealedMeta = Meta(value.asValue())
 
-@Suppress("FunctionName")
-public inline fun Meta(builder: MutableMeta.() -> Unit): SealedMeta =
-    MutableMeta(builder).seal()
 
+/**
+ * A lightweight mutable meta without an observability
+ */
+@PublishedApi
+internal class MetaBuilder(
+    override var value: Value? = null,
+    override val items: MutableMap<NameToken, MetaBuilder> = hashMapOf(),
+) : MutableMeta {
+
+    override fun getOrCreate(name: Name): MetaBuilder {
+        val existing = get(name) as? MetaBuilder
+        return if (existing == null) {
+            val newItem = MetaBuilder()
+            set(name, newItem)
+            newItem
+        } else {
+            existing
+        }
+    }
+
+    private fun wrap(meta: Meta): MetaBuilder = meta as? MetaBuilder ?: MetaBuilder(
+        meta.value,
+        meta.items.mapValuesTo(hashMapOf()) { wrap(it.value) }
+    )
+
+
+    override fun set(name: Name, node: Meta?) {
+        when (name.length) {
+            0 -> error("Can't set a meta with empty name")
+            1 -> {
+                val token = name.first()
+                //remove child and invalidate if argument is null
+                if (node == null) {
+                    items.remove(token)
+                } else {
+                    items[token] = wrap(node)
+                }
+            }
+
+            else -> {
+                getOrCreate(name.first().asName()).set(name.cutFirst(), node)
+            }
+        }
+    }
+
+    override fun toString(): String = Meta.toString(this)
+
+    override fun equals(other: Any?): Boolean = Meta.equals(this, other as? Meta)
+
+    override fun hashCode(): Int = Meta.hashCode(this)
+}
+
+/**
+ * Create a read-only meta.
+ */
+public inline fun Meta(builder: MutableMeta.() -> Unit): Meta =
+    MetaBuilder().apply(builder).seal()
+
+/**
+ * Create an immutable meta.
+ */
+public inline fun SealedMeta(builder: MutableMeta.() -> Unit): SealedMeta =
+    MetaBuilder().apply(builder).seal()
+
+/**
+ * Create an empty meta mutable meta.
+ */
+@JsName("newMutableMeta")
+public fun MutableMeta(): MutableMeta = MetaBuilder()
+
+/**
+ * Create a mutable meta with given builder.
+ */
+public inline fun MutableMeta(builder: MutableMeta.() -> Unit = {}): MutableMeta =
+    MutableMeta().apply(builder)

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

@@ -64,6 +64,7 @@ public interface Value {
                         ListValue(list)
                     }
                 }
+
                 is DoubleArray -> value.asValue()
                 is IntArray -> value.asValue()
                 is FloatArray -> value.asValue()
@@ -76,6 +77,41 @@ public interface Value {
                 else -> throw IllegalArgumentException("Unrecognized type of the object (${value::class}) converted to Value")
             }
         }
+
+        /**
+         * Parse value from string. Double-quoted strings are parsed literally. true/false are parsed as booleans
+         */
+        public fun parse(string: String): Value {
+
+            //Trying to get integer
+            if (string.isEmpty() || string == Null.string) {
+                return Null
+            }
+
+            //string constants
+            if (string.startsWith("\"") && string.endsWith("\"")) {
+                return StringValue(string.substring(1, string.length - 2))
+            }
+
+            string.toIntOrNull()?.let {
+                return NumberValue(it)
+            }
+
+            string.toDoubleOrNull()?.let {
+                return NumberValue(it)
+            }
+
+            if ("true" == string) {
+                return True
+            }
+
+            if ("false" == string) {
+                return False
+            }
+
+            //Give up and return a StringValue
+            return StringValue(string)
+        }
     }
 }
 
@@ -140,7 +176,7 @@ public class NumberValue(public val number: Number) : Value {
 
         val otherNumber = other.numberOrNull ?: return false
 
-        if(number == otherNumber) return true
+        if (number == otherNumber) return true
 
         //Do not change the order of comparison. On JS number is the instance of all types
         return when (numberOrNull) {
@@ -228,34 +264,5 @@ public fun <E : Enum<E>> E.asValue(): Value = EnumValue(this)
 /**
  * Create Value from String using the closest match conversion
  */
-public fun String.parseValue(): Value {
-
-    //Trying to get integer
-    if (isEmpty() || this == Null.string) {
-        return Null
-    }
-
-    //string constants
-    if (startsWith("\"") && endsWith("\"")) {
-        return StringValue(substring(1, length - 2))
-    }
-
-    toIntOrNull()?.let {
-        return NumberValue(it)
-    }
-
-    toDoubleOrNull()?.let {
-        return NumberValue(it)
-    }
-
-    if ("true" == this) {
-        return True
-    }
-
-    if ("false" == this) {
-        return False
-    }
-
-    //Give up and return a StringValue
-    return StringValue(this)
-}
+@Deprecated("Use Value.parse(this) instead", ReplaceWith("Value.parse(this)"))
+public fun String.parseValue(): Value = Value.parse(this)

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

@@ -7,7 +7,7 @@ import space.kscience.dataforge.names.*
 /**
  * Restrictions on value in the node
  */
-public enum class ValueRequirement {
+public enum class ValueRestriction {
     /**
      * No restrictions
      */
@@ -26,26 +26,25 @@ public enum class ValueRequirement {
 
 /**
  * The descriptor for a meta
- * @param info description text
+ * @param description description text
  * @param children child descriptors for this node
  * @param multiple True if same name siblings with this name are allowed
- * @param valueRequirement The requirements for node content
+ * @param valueRestriction The requirements for node content
  * @param valueTypes list of allowed types for [Meta.value], null if all values are allowed.
  *  Empty list means that no value should be present in this node.
  * @param indexKey An index field by which this node is identified in case of same name siblings construct
  * @param defaultValue the default [Meta.value] for the node
- * @param attributes additional attributes of this descriptor. For example validation and widget parameters
+ * @param attributes additional attributes of this descriptor. For example, validation and widget parameters
  */
 @Serializable
 public data class MetaDescriptor(
-    public val info: String? = null,
+    public val description: String? = null,
     public val children: Map<String, MetaDescriptor> = emptyMap(),
     public val multiple: Boolean = false,
-    public val valueRequirement: ValueRequirement = ValueRequirement.NONE,
+    public val valueRestriction: ValueRestriction = ValueRestriction.NONE,
     public val valueTypes: List<ValueType>? = null,
     public val indexKey: String = Meta.INDEX_KEY,
     public val defaultValue: Value? = null,
-    public val readOnly: Boolean = false,
     public val attributes: Meta = Meta.EMPTY,
 ) {
     /**
@@ -63,11 +62,12 @@ public data class MetaDescriptor(
     }
 
     public companion object {
+        public val EMPTY: MetaDescriptor = MetaDescriptor("Generic meta tree")
         internal const val ALLOWED_VALUES_KEY = "allowedValues"
     }
 }
 
-public val MetaDescriptor.required: Boolean get() = valueRequirement == ValueRequirement.REQUIRED || children.values.any { required }
+public val MetaDescriptor.required: Boolean get() = valueRestriction == ValueRestriction.REQUIRED || children.values.any { required }
 
 public val MetaDescriptor.allowedValues: List<Value>? get() = attributes[MetaDescriptor.ALLOWED_VALUES_KEY]?.value?.list
 
@@ -80,9 +80,9 @@ public operator fun MetaDescriptor.get(name: Name): MetaDescriptor? = when (name
 public operator fun MetaDescriptor.get(name: String): MetaDescriptor? = get(name.parseAsName(true))
 
 public fun MetaDescriptor.validate(value: Value?): Boolean = if (value == null) {
-    valueRequirement != ValueRequirement.REQUIRED
+    valueRestriction != ValueRestriction.REQUIRED
 } else {
-    if (valueRequirement == ValueRequirement.ABSENT) false
+    if (valueRestriction == ValueRestriction.ABSENT) false
     else {
         (valueTypes == null || value.type in valueTypes) && (allowedValues?.let { value in it } ?: true)
     }

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

@@ -8,20 +8,26 @@ import space.kscience.dataforge.names.first
 import space.kscience.dataforge.names.length
 import kotlin.collections.set
 
-public class MetaDescriptorBuilder  @PublishedApi internal constructor() {
+public class MetaDescriptorBuilder @PublishedApi internal constructor() {
     public var info: String? = null
     public var children: MutableMap<String, MetaDescriptorBuilder> = linkedMapOf()
     public var multiple: Boolean = false
-    public var valueRequirement: ValueRequirement = ValueRequirement.NONE
-    public var readOnly: Boolean = false
+    public var valueRestriction: ValueRestriction = ValueRestriction.NONE
 
-    public var type: List<ValueType>? = null
+    public var valueTypes: List<ValueType>? = null
 
-    public fun type(primaryType: ValueType, vararg otherTypes: ValueType) {
-        type = listOf(primaryType, *otherTypes)
+    public fun valueType(primaryType: ValueType, vararg otherTypes: ValueType) {
+        valueTypes = listOf(primaryType, *otherTypes)
     }
 
+    /**
+     * A key for indexing values. Should be changed in case of the name clash.
+     */
     public var indexKey: String = Meta.INDEX_KEY
+
+    /**
+     * The default value
+     */
     public var default: Value? = null
 
     public fun default(value: Any?) {
@@ -42,6 +48,7 @@ public class MetaDescriptorBuilder  @PublishedApi internal constructor() {
                 children[name.first().body] = target
                 target
             }
+
             else -> {
                 children.getOrPut(name.first().body) { MetaDescriptorBuilder() }.item(name.cutFirst(), block)
             }
@@ -51,16 +58,17 @@ public class MetaDescriptorBuilder  @PublishedApi internal constructor() {
     public fun node(
         name: Name,
         descriptor: MetaDescriptor,
-        block: MetaDescriptorBuilder.() -> Unit = {}
+        block: MetaDescriptorBuilder.() -> Unit = {},
     ): MetaDescriptorBuilder = when (name.length) {
         0 -> error("Can't set descriptor to root")
         1 -> {
             val item = descriptor.toBuilder().apply {
-                valueRequirement = ValueRequirement.ABSENT
+                valueRestriction = ValueRestriction.ABSENT
             }.apply(block)
             children[name.first().body] = item
             item
         }
+
         else -> children.getOrPut(name.first().body) {
             MetaDescriptorBuilder()
         }.node(name.cutFirst(), descriptor, block)
@@ -79,14 +87,13 @@ public class MetaDescriptorBuilder  @PublishedApi internal constructor() {
 
     @PublishedApi
     internal fun build(): MetaDescriptor = MetaDescriptor(
-        info = info,
+        description = info,
         children = children.mapValues { it.value.build() },
         multiple = multiple,
-        valueRequirement = valueRequirement,
-        valueTypes = type,
+        valueRestriction = valueRestriction,
+        valueTypes = valueTypes,
         indexKey = indexKey,
         defaultValue = default,
-        readOnly = readOnly,
         attributes = attributes
     )
 }
@@ -104,9 +111,9 @@ public fun MetaDescriptorBuilder.value(
     name: Name,
     type: ValueType,
     vararg additionalTypes: ValueType,
-    block: MetaDescriptorBuilder.() -> Unit = {}
+    block: MetaDescriptorBuilder.() -> Unit = {},
 ): MetaDescriptorBuilder = item(name) {
-    type(type, *additionalTypes)
+    valueType(type, *additionalTypes)
     block()
 }
 
@@ -114,16 +121,16 @@ public fun MetaDescriptorBuilder.value(
     name: String,
     type: ValueType,
     vararg additionalTypes: ValueType,
-    block: MetaDescriptorBuilder.() -> Unit = {}
+    block: MetaDescriptorBuilder.() -> Unit = {},
 ): MetaDescriptorBuilder = value(Name.parse(name), type, additionalTypes = additionalTypes, block)
 
 /**
  * Create and configure child value descriptor
  */
 public fun MetaDescriptorBuilder.node(
-    name: Name, block: MetaDescriptorBuilder.() -> Unit
+    name: Name, block: MetaDescriptorBuilder.() -> Unit,
 ): MetaDescriptorBuilder = item(name) {
-    valueRequirement = ValueRequirement.ABSENT
+    valueRestriction = ValueRestriction.ABSENT
     block()
 }
 
@@ -142,7 +149,7 @@ public fun MetaDescriptorBuilder.node(
 }
 
 public fun MetaDescriptorBuilder.required() {
-    valueRequirement = ValueRequirement.REQUIRED
+    valueRestriction = ValueRestriction.REQUIRED
 }
 
 public inline fun <reified E : Enum<E>> MetaDescriptorBuilder.enum(
@@ -158,11 +165,11 @@ public inline fun <reified E : Enum<E>> MetaDescriptorBuilder.enum(
 }
 
 private fun MetaDescriptor.toBuilder(): MetaDescriptorBuilder = MetaDescriptorBuilder().apply {
-    info = this@toBuilder.info
+    info = this@toBuilder.description
     children = this@toBuilder.children.mapValuesTo(LinkedHashMap()) { it.value.toBuilder() }
     multiple = this@toBuilder.multiple
-    valueRequirement = this@toBuilder.valueRequirement
-    type = this@toBuilder.valueTypes
+    valueRestriction = this@toBuilder.valueRestriction
+    valueTypes = this@toBuilder.valueTypes
     indexKey = this@toBuilder.indexKey
     default = defaultValue
     attributes = this@toBuilder.attributes.toMutableMeta()

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

@@ -5,7 +5,7 @@ package space.kscience.dataforge.meta
  * A value built from string which content and type are parsed on-demand
  */
 public class LazyParsedValue(public val string: String) : Value {
-    private val parsedValue by lazy { string.parseValue() }
+    private val parsedValue by lazy { Value.parse(string) }
 
     override val value: Any? get() = parsedValue.value
     override val type: ValueType get() = parsedValue.type

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

@@ -1,79 +1,155 @@
 package space.kscience.dataforge.meta.transformations
 
 import space.kscience.dataforge.meta.*
+import space.kscience.dataforge.meta.descriptors.MetaDescriptor
+import kotlin.reflect.KType
+import kotlin.reflect.typeOf
 
 /**
  * A converter of generic object to and from [Meta]
  */
 public interface MetaConverter<T> {
-    public fun metaToObject(meta: Meta): T?
+
+    /**
+     * Runtime type of [T]
+     */
+    public val type: KType
+
+    /**
+     * A descriptor for resulting meta
+     */
+    public val descriptor: MetaDescriptor get() = MetaDescriptor.EMPTY
+
+    /**
+     * Attempt conversion of [meta] to an object or return null if conversion failed
+     */
+    public fun metaToObjectOrNull(meta: Meta): T?
+
+    public fun metaToObject(meta: Meta): T =
+        metaToObjectOrNull(meta) ?: error("Meta $meta could not be interpreted by $this")
+
     public fun objectToMeta(obj: T): Meta
 
     public companion object {
 
         public val meta: MetaConverter<Meta> = object : MetaConverter<Meta> {
-            override fun metaToObject(meta: Meta): Meta = meta
+            override val type: KType = typeOf<Meta>()
+
+            override fun metaToObjectOrNull(meta: Meta): Meta = meta
             override fun objectToMeta(obj: Meta): Meta = obj
         }
 
         public val value: MetaConverter<Value> = object : MetaConverter<Value> {
-            override fun metaToObject(meta: Meta): Value? = meta.value
+            override val type: KType = typeOf<Value>()
+
+            override fun metaToObjectOrNull(meta: Meta): Value? = meta.value
             override fun objectToMeta(obj: Value): Meta = Meta(obj)
         }
 
         public val string: MetaConverter<String> = object : MetaConverter<String> {
-            override fun metaToObject(meta: Meta): String? = meta.string
+            override val type: KType = typeOf<String>()
+
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.STRING)
+            }
+
+
+            override fun metaToObjectOrNull(meta: Meta): String? = meta.string
             override fun objectToMeta(obj: String): Meta = Meta(obj.asValue())
         }
 
         public val boolean: MetaConverter<Boolean> = object : MetaConverter<Boolean> {
-            override fun metaToObject(meta: Meta): Boolean? = meta.boolean
+            override val type: KType = typeOf<Boolean>()
+
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.BOOLEAN)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Boolean? = meta.boolean
             override fun objectToMeta(obj: Boolean): Meta = Meta(obj.asValue())
         }
 
         public val number: MetaConverter<Number> = object : MetaConverter<Number> {
-            override fun metaToObject(meta: Meta): Number? = meta.number
+            override val type: KType = typeOf<Number>()
+
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Number? = meta.number
             override fun objectToMeta(obj: Number): Meta = Meta(obj.asValue())
         }
 
         public val double: MetaConverter<Double> = object : MetaConverter<Double> {
-            override fun metaToObject(meta: Meta): Double? = meta.double
+            override val type: KType = typeOf<Double>()
 
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Double? = meta.double
             override fun objectToMeta(obj: Double): Meta = Meta(obj.asValue())
         }
 
         public val float: MetaConverter<Float> = object : MetaConverter<Float> {
-            override fun metaToObject(meta: Meta): Float? = meta.float
+            override val type: KType = typeOf<Float>()
 
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Float? = meta.float
             override fun objectToMeta(obj: Float): Meta = Meta(obj.asValue())
         }
 
         public val int: MetaConverter<Int> = object : MetaConverter<Int> {
-            override fun metaToObject(meta: Meta): Int? = meta.int
+            override val type: KType = typeOf<Int>()
 
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Int? = meta.int
             override fun objectToMeta(obj: Int): Meta = Meta(obj.asValue())
         }
 
         public val long: MetaConverter<Long> = object : MetaConverter<Long> {
-            override fun metaToObject(meta: Meta): Long? = meta.long
+            override val type: KType = typeOf<Long>()
 
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.NUMBER)
+            }
+
+            override fun metaToObjectOrNull(meta: Meta): Long? = meta.long
             override fun objectToMeta(obj: Long): Meta = Meta(obj.asValue())
         }
 
         public inline fun <reified E : Enum<E>> enum(): MetaConverter<E> = object : MetaConverter<E> {
+            override val type: KType = typeOf<E>()
+
+            override val descriptor: MetaDescriptor = MetaDescriptor {
+                valueType(ValueType.STRING)
+                allowedValues(enumValues<E>())
+            }
+
             @Suppress("USELESS_CAST")
-            override fun metaToObject(meta: Meta): E = meta.enum<E>() as? E ?: error("The Item is not a Enum")
+            override fun metaToObjectOrNull(meta: Meta): E = meta.enum<E>() as? E ?: error("The Item is not a Enum")
 
             override fun objectToMeta(obj: E): Meta = Meta(obj.asValue())
         }
 
         public fun <T> valueList(
             writer: (T) -> Value = { Value.of(it) },
-            reader: (Value) -> T
+            reader: (Value) -> T,
         ): MetaConverter<List<T>> =
             object : MetaConverter<List<T>> {
-                override fun metaToObject(meta: Meta): List<T> =
-                    meta.value?.list?.map(reader) ?: error("The item is not a value list")
+                override val type: KType = typeOf<List<T>>()
+
+                override val descriptor: MetaDescriptor = MetaDescriptor {
+                    valueType(ValueType.LIST)
+                }
+
+                override fun metaToObjectOrNull(meta: Meta): List<T>? = meta.value?.list?.map(reader)
 
                 override fun objectToMeta(obj: List<T>): Meta = Meta(obj.map(writer).asValue())
             }

dataforge-meta/src/commonMain/kotlin/space/kscience/dataforge/meta/transformations/MetaTransformation.kt

@@ -42,7 +42,7 @@ public data class KeepTransformationRule(val selector: (Name) -> Boolean) :
         meta.nodeSequence().map { it.first }.filter(selector)
 
     override fun transformItem(name: Name, item: Meta?, target: MutableMeta) {
-        if (selector(name)) target.setMeta(name, item)
+        if (selector(name)) target.set(name, item)
     }
 }
 
@@ -105,7 +105,7 @@ public value class MetaTransformation(private val transformations: Collection<Tr
      * Generate an observable configuration that contains only elements defined by transformation rules and changes with the source
      */
     @DFExperimental
-    public fun generate(source: ObservableMeta): ObservableMeta = MutableMeta().apply {
+    public fun generate(source: ObservableMeta): ObservableMeta = ObservableMutableMeta{
         transformations.forEach { rule ->
             rule.selectItems(source).forEach { name ->
                 rule.transformItem(name, source[name], this)
@@ -174,7 +174,7 @@ public class MetaTransformationBuilder {
     public fun keep(regex: String) {
         transformations.add(
             RegexItemTransformationRule(regex.toRegex()) { name, _, Meta ->
-                setMeta(name, Meta)
+                set(name, Meta)
             })
     }
 
@@ -184,7 +184,7 @@ public class MetaTransformationBuilder {
     public fun move(from: Name, to: Name, operation: (Meta?) -> Meta? = { it }) {
         transformations.add(
             SingleItemTransformationRule(from) { _, item ->
-                setMeta(to, operation(item))
+                set(to, operation(item))
             }
         )
     }

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

@@ -2,9 +2,7 @@ package space.kscience.dataforge.misc
 
 /**
  * A text label for internal DataForge type classification. Alternative for mime container type.
- *
- * The DataForge type notation presumes that type `A.B.C` is the subtype of `A.B`
  */
 @MustBeDocumented
 @Target(AnnotationTarget.CLASS)
-public annotation class Type(val id: String)
+public annotation class DfId(val id: String)

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

@@ -134,6 +134,11 @@ public val Name.length: Int get() = tokens.size
  */
 public fun Name.lastOrNull(): NameToken? = tokens.lastOrNull()
 
+/**
+ * Last token or throw exception
+ */
+public fun Name.last(): NameToken = tokens.last()
+
 /**
  * First token of the name or null if it is empty
  */

dataforge-meta/src/jvmTest/kotlin/space/kscience/dataforge/meta/JvmMutableMetaTest.kt

@@ -1,15 +0,0 @@
-package space.kscience.dataforge.meta
-
-import org.junit.jupiter.api.Test
-import kotlin.test.assertFails
-
-class JvmMutableMetaTest {
-    @Test
-    fun recursiveMeta(){
-        val meta = MutableMeta {
-            "a" put 2
-        }
-
-        assertFails { meta["child.a"] = meta }
-    }
-}

dataforge-scripting/README.md

@@ -6,27 +6,18 @@
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-scripting:0.7.0`.
 
-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-scripting:0.6.2-dev-2'
-}
-```
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
+    //uncomment to access development builds
+    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-scripting:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-scripting:0.7.0")
 }
 ```

dataforge-workspace/README.md

@@ -6,27 +6,18 @@
 
 ## Artifact:
 
-The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.6.2-dev-2`.
+The Maven coordinates of this project are `space.kscience:dataforge-workspace:0.7.0`.
 
-**Gradle Groovy:**
-```groovy
-repositories {
-    maven { url 'https://repo.kotlin.link' }
-    mavenCentral()
-}
-
-dependencies {
-    implementation 'space.kscience:dataforge-workspace:0.6.2-dev-2'
-}
-```
 **Gradle Kotlin DSL:**
 ```kotlin
 repositories {
     maven("https://repo.kotlin.link")
+    //uncomment to access development builds
+    //maven("https://maven.pkg.jetbrains.space/spc/p/sci/dev")
     mavenCentral()
 }
 
 dependencies {
-    implementation("space.kscience:dataforge-workspace:0.6.2-dev-2")
+    implementation("space.kscience:dataforge-workspace:0.7.0")
 }
 ```

dataforge-workspace/build.gradle.kts

@@ -10,14 +10,18 @@ kscience{
     useSerialization{
         protobuf()
     }
-    dependencies {
-        api(projects.dataforgeContext)
-        api(projects.dataforgeData)
-        api(projects.dataforgeIo)
+    commonMain{
+        dependencies {
+            api(projects.dataforgeContext)
+            api(projects.dataforgeData)
+            api(projects.dataforgeIo)
+        }
     }
-    dependencies(jvmTest){
-        implementation(spclibs.logback.classic)
-        implementation(projects.dataforgeIo.dataforgeIoYaml)
+    jvmTest{
+        dependencies {
+            implementation(spclibs.logback.classic)
+            implementation(projects.dataforgeIo.dataforgeIoYaml)
+        }
     }
 }
 

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

@@ -9,7 +9,7 @@ import space.kscience.dataforge.meta.MetaRepr
 import space.kscience.dataforge.meta.Specification
 import space.kscience.dataforge.meta.descriptors.Described
 import space.kscience.dataforge.meta.descriptors.MetaDescriptor
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.workspace.Task.Companion.TYPE
 import kotlin.reflect.KType
@@ -19,7 +19,7 @@ import kotlin.reflect.typeOf
  * A configurable task that could be executed on a workspace. The [TaskResult] represents a lazy result of the task.
  * In general no computations should be made until the result is called.
  */
-@Type(TYPE)
+@DfId(TYPE)
 public interface Task<out T : Any> : Described {
 
     /**

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

@@ -6,7 +6,7 @@ import space.kscience.dataforge.data.DataSet
 import space.kscience.dataforge.data.asSequence
 import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.meta.MutableMeta
-import space.kscience.dataforge.misc.Type
+import space.kscience.dataforge.misc.DfId
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.provider.Provider
 
@@ -18,7 +18,7 @@ public interface DataSelector<T: Any>{
 /**
  * An environment for pull-mode computation
  */
-@Type(Workspace.TYPE)
+@DfId(Workspace.TYPE)
 public interface Workspace : ContextAware, Provider {
     /**
      * The whole data node for current workspace

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

@@ -33,9 +33,12 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
     dependencyMeta: Meta = defaultDependencyMeta,
     selectorBuilder: P.() -> TaskReference<T>,
 ): DataSet<T> {
-    require(workspace.context.plugins.contains(plugin)){"Plugin $plugin is not loaded into $workspace"}
+    require(workspace.context.plugins.contains(plugin)) { "Plugin $plugin is not loaded into $workspace" }
     val taskReference: TaskReference<T> = plugin.selectorBuilder()
-    return workspace.produce(plugin.name + taskReference.taskName, dependencyMeta) as TaskResult<T>
+    val res = workspace.produce(plugin.name + taskReference.taskName, dependencyMeta)
+    //TODO add explicit check after https://youtrack.jetbrains.com/issue/KT-32956
+    @Suppress("UNCHECKED_CAST")
+    return  res as TaskResult<T>
 }
 
 /**
@@ -45,7 +48,7 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
  * @param dependencyMeta meta used for selector. The same meta is used for caching. By default, uses [defaultDependencyMeta].
  * @param selectorBuilder a builder of task from the plugin.
  */
-public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuilder<*>.from(
+public suspend inline fun <reified T : Any, reified P : WorkspacePlugin> TaskResultBuilder<*>.from(
     pluginFactory: PluginFactory<P>,
     dependencyMeta: Meta = defaultDependencyMeta,
     selectorBuilder: P.() -> TaskReference<T>,
@@ -53,7 +56,10 @@ public suspend inline fun <T : Any, reified P : WorkspacePlugin> TaskResultBuild
     val plugin = workspace.context.plugins[pluginFactory]
         ?: error("Plugin ${pluginFactory.tag} not loaded into workspace context")
     val taskReference: TaskReference<T> = plugin.selectorBuilder()
-    return workspace.produce(plugin.name + taskReference.taskName, dependencyMeta) as TaskResult<T>
+    val res = workspace.produce(plugin.name + taskReference.taskName, dependencyMeta)
+    //TODO explicit check after https://youtrack.jetbrains.com/issue/KT-32956
+    @Suppress("UNCHECKED_CAST")
+    return res as TaskResult<T>
 }
 
 public val TaskResultBuilder<*>.allData: DataSelector<*>
@@ -79,7 +85,7 @@ public suspend inline fun <T : Any, reified R : Any> TaskResultBuilder<R>.pipeFr
 ) {
     from(selector, dependencyMeta).forEach { data ->
         val meta = data.meta.toMutableMeta().apply {
-            taskMeta[taskName]?.let {  taskName.put(it) }
+            taskMeta[taskName]?.let { taskName.put(it) }
             dataMetaTransform(data.name)
         }
 

dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/FileWorkspaceCache.kt

@@ -1,9 +1,6 @@
 package space.kscience.dataforge.workspace
 
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
-import io.ktor.utils.io.core.readBytes
-import io.ktor.utils.io.core.writeFully
+import kotlinx.io.*
 import kotlinx.serialization.ExperimentalSerializationApi
 import kotlinx.serialization.KSerializer
 import kotlinx.serialization.json.Json
@@ -30,10 +27,10 @@ public class JsonIOFormat<T : Any>(override val type: KType) : IOFormat<T> {
     @Suppress("UNCHECKED_CAST")
     private val serializer: KSerializer<T> = serializer(type) as KSerializer<T>
 
-    override fun readObject(input: Input): T = Json.decodeFromString(serializer, input.readUtf8String())
+    override fun readFrom(source: Source): T = Json.decodeFromString(serializer, source.readString())
 
-    override fun writeObject(output: Output, obj: T) {
-        output.writeUtf8String(Json.encodeToString(serializer, obj))
+    override fun writeTo(sink: Sink, obj: T) {
+        sink.writeString(Json.encodeToString(serializer, obj))
     }
 }
 
@@ -43,10 +40,10 @@ public class ProtobufIOFormat<T : Any>(override val type: KType) : IOFormat<T> {
     @Suppress("UNCHECKED_CAST")
     private val serializer: KSerializer<T> = serializer(type) as KSerializer<T>
 
-    override fun readObject(input: Input): T = ProtoBuf.decodeFromByteArray(serializer, input.readBytes())
+    override fun readFrom(source: Source): T = ProtoBuf.decodeFromByteArray(serializer, source.readByteArray())
 
-    override fun writeObject(output: Output, obj: T) {
-        output.writeFully(ProtoBuf.encodeToByteArray(serializer, obj))
+    override fun writeTo(sink: Sink, obj: T) {
+        sink.write(ProtoBuf.encodeToByteArray(serializer, obj))
     }
 }
 
@@ -88,7 +85,7 @@ public class FileWorkspaceCache(public val cacheDirectory: Path) : WorkspaceCach
                     val envelope = Envelope {
                         meta = data.meta
                         data {
-                            writeObject(format, result)
+                            writeWith(format, result)
                         }
                     }
                     io.writeEnvelopeFile(path, envelope)

dataforge-workspace/src/jvmMain/kotlin/space/kscience/dataforge/workspace/zipData.kt

@@ -1,13 +1,10 @@
 package space.kscience.dataforge.workspace
 
-import io.ktor.utils.io.streams.asOutput
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import space.kscience.dataforge.data.DataTree
 import space.kscience.dataforge.data.DataTreeItem
-import space.kscience.dataforge.io.EnvelopeFormat
-import space.kscience.dataforge.io.IOFormat
-import space.kscience.dataforge.io.TaggedEnvelopeFormat
+import space.kscience.dataforge.io.*
 import space.kscience.dataforge.misc.DFExperimental
 import java.nio.file.Files
 import java.nio.file.Path
@@ -28,11 +25,15 @@ private suspend fun <T : Any> ZipOutputStream.writeNode(
             val envelope = treeItem.data.toEnvelope(dataFormat)
             val entry = ZipEntry(name)
             putNextEntry(entry)
-            asOutput().run {
-                envelopeFormat.writeObject(this, envelope)
-                flush()
+
+            //TODO remove additional copy
+            val bytes = ByteArray {
+                writeWith(envelopeFormat, envelope)
             }
+            write(bytes)
+
         }
+
         is DataTreeItem.Node -> {
             val entry = ZipEntry("$name/")
             putNextEntry(entry)

dataforge-workspace/src/jvmTest/kotlin/space/kscience/dataforge/workspace/FileDataTest.kt

@@ -1,12 +1,18 @@
 package space.kscience.dataforge.workspace
 
-import io.ktor.utils.io.core.Input
-import io.ktor.utils.io.core.Output
 import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.test.runTest
+import kotlinx.io.Sink
+import kotlinx.io.Source
+import kotlinx.io.readString
+import kotlinx.io.writeString
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.Global
 import space.kscience.dataforge.data.*
-import space.kscience.dataforge.io.*
+import space.kscience.dataforge.io.Envelope
+import space.kscience.dataforge.io.IOFormat
+import space.kscience.dataforge.io.io
+import space.kscience.dataforge.io.readEnvelopeFile
 import space.kscience.dataforge.io.yaml.YamlPlugin
 import space.kscience.dataforge.meta.get
 import space.kscience.dataforge.misc.DFExperimental
@@ -36,11 +42,11 @@ class FileDataTest {
     object StringIOFormat : IOFormat<String> {
         override val type: KType get() = typeOf<String>()
 
-        override fun writeObject(output: Output, obj: String) {
-            output.writeUtf8String(obj)
+        override fun writeTo(sink: Sink, obj: String) {
+            sink.writeString(obj)
         }
 
-        override fun readObject(input: Input): String = input.readUtf8String()
+        override fun readFrom(source: Source): String = source.readString()
     }
 
     @Test
@@ -59,9 +65,9 @@ class FileDataTest {
 
     @Test
     @DFExperimental
-    fun testZipWriteRead() = with(Global.io) {
-        val zip = Files.createTempFile("df_data_node", ".zip")
-        runBlocking {
+    fun testZipWriteRead() = runTest {
+        with(Global.io) {
+            val zip = Files.createTempFile("df_data_node", ".zip")
             dataNode.writeZip(zip, StringIOFormat)
             println(zip.toUri().toString())
             val reconstructed = readDataDirectory(zip) { _, _ -> StringIOFormat }

gradle.properties

@@ -6,4 +6,5 @@ kotlin.mpp.stability.nowarn=true
 kotlin.incremental.js.ir=true
 kotlin.native.ignoreDisabledTargets=true
 
-toolsVersion=0.14.9-kotlin-1.8.20
+toolsVersion=0.15.1-kotlin-1.9.21
+#kotlin.experimental.tryK2=true

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

settings.gradle.kts

@@ -1,7 +1,6 @@
 rootProject.name = "dataforge-core"
 
 enableFeaturePreview("TYPESAFE_PROJECT_ACCESSORS")
-//enableFeaturePreview("VERSION_CATALOGS")
 
 pluginManagement {
 
@@ -15,6 +14,7 @@ pluginManagement {
     }
 
     plugins {
+        id("org.gradle.toolchains.foojay-resolver-convention") version "0.7.0"
         id("space.kscience.gradle.project") version toolsVersion
         id("space.kscience.gradle.mpp") version toolsVersion
         id("space.kscience.gradle.jvm") version toolsVersion