Json serialization for JVM and Binary serialization in common

.gitignore

@@ -8,3 +8,4 @@ out/
 
 !gradle-wrapper.jar
 
+artifactory.gradle

build.gradle

@@ -1,7 +1,7 @@
 buildscript {
-    ext.kotlin_version = '1.3.0-rc-57'
-    ext.serialization_version = '0.8.0-rc13'
-    ext.kotlinx_io_version = '0.1.0-alpha-15-rc13'
+    ext.kotlin_version = '1.3.0-rc-190'
+    ext.serialization_version = '0.8.3-rc13'
+    ext.kotlinx_io_version = '0.1.0-alpha-24-rc13'
     repositories {
         jcenter()
         maven {
@@ -12,26 +12,25 @@ buildscript {
     dependencies {
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "org.jetbrains.kotlin:kotlin-serialization:$kotlin_version"
+        classpath "org.jfrog.buildinfo:build-info-extractor-gradle:4+"
     }
 }
 
-//plugins {
-//    id 'kotlin-platform-common' version "$kotlin_version" apply false
-//    id 'kotlin-platform-jvm' version "$kotlin_version" apply false
-//    id 'kotlin-platform-js' version "$kotlin_version" apply false
-//    id 'kotlinx-serialization' version "$kotlin_version" apply false
-//}
-
-description = "The basic interfaces for DataForge meta-data"
-
-group = 'hep.dataforge'
-version = '0.1.1-SNAPSHOT'
-
 allprojects {
+    apply plugin: 'maven-publish'
+    apply plugin: "com.jfrog.artifactory"
+
     repositories {
         jcenter()
         maven { url = "http://dl.bintray.com/kotlin/kotlin-eap" }
         maven { url = "https://kotlin.bintray.com/kotlinx" }
         //maven { url 'https://jitpack.io' }
     }
+
+    group = 'hep.dataforge'
+    version = '0.1.1-SNAPSHOT'
+}
+
+if(file('aritfactory.gradle').exists()) {
+    apply from: 'aritfactory.gradle'
 }

dataforge-envelope/build.gradle

@@ -1,13 +0,0 @@
-plugins{
-    id 'kotlin-platform-common'
-}
-
-dependencies {
-    compile project(":dataforge-meta")
-
-    compile "org.jetbrains.kotlinx:kotlinx-io:$kotlinx_io_version"
-    
-    compile "org.jetbrains.kotlin:kotlin-stdlib-common:$kotlin_version"
-    testCompile "org.jetbrains.kotlin:kotlin-test-annotations-common"
-    testCompile "org.jetbrains.kotlin:kotlin-test-common"
-}

dataforge-envelope/src/main/kotlin/hep/dataforge/envelopes/Envelope.kt

@@ -1,9 +0,0 @@
-package hep.dataforge.envelopes
-
-import hep.dataforge.meta.Meta
-import kotlinx.io.core.IoBuffer
-
-interface Envelope{
-    val meta: Meta
-    val data: IoBuffer
-}

dataforge-meta-io/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'kotlin-multiplatform'// version '1.3.0-rc-57'
+    id 'kotlin-multiplatform'
     id 'kotlinx-serialization'
 }
 repositories {
@@ -18,45 +18,28 @@ kotlin {
     sourceSets {
         commonMain {
             dependencies {
-                implementation project(":dataforge-meta")
-                implementation "org.jetbrains.kotlin:kotlin-stdlib-common"
+                api project(":dataforge-meta")
                 implementation 'org.jetbrains.kotlin:kotlin-reflect'
+                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:$serialization_version"
                 implementation "org.jetbrains.kotlinx:kotlinx-io:$kotlinx_io_version"
-                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:$serialization_version"
-            }
-        }
-        commonTest {
-            dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-test-common'
-                implementation 'org.jetbrains.kotlin:kotlin-test-annotations-common'
-                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:$serialization_version"
             }
         }
+        commonTest {}
         jvmMain {
             dependencies {
-                implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
-                implementation "org.jetbrains.kotlinx:kotlinx-io-jvm:$kotlinx_io_version"
+                implementation 'com.github.cliftonlabs:json-simple:3.0.2'
                 implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime:$serialization_version"
+                implementation "org.jetbrains.kotlinx:kotlinx-io-jvm:$kotlinx_io_version"
             }
         }
-        jvmTest {
-            dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-test'
-                implementation 'org.jetbrains.kotlin:kotlin-test-junit'
-            }
-        }
+        jvmTest {}
         jsMain {
             dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-stdlib-js'
-                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-js:$serialization_version"
-            }
-        }
-        jsTest {
-            dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-test-js'
                 implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-js:$serialization_version"
+                implementation "org.jetbrains.kotlinx:kotlinx-io-js:$kotlinx_io_version"
             }
         }
+        jsTest {}
 //        iosMain {
 //        }
 //        iosTest {

dataforge-meta-io/src/commonMain/kotlin/hep/dataforge/meta/io/MetaFormat.kt

@@ -1,8 +1,10 @@
 package hep.dataforge.meta.io
 
-import hep.dataforge.meta.Meta
+import hep.dataforge.meta.*
 import kotlinx.io.core.Input
 import kotlinx.io.core.Output
+import kotlinx.io.core.readText
+import kotlinx.io.core.writeText
 
 /**
  * A format for meta serialization
@@ -24,3 +26,148 @@ interface MetaFormat {
 // * Resolve format by its binary key. Null if not provided
 // */
 //expect fun resolveFormat(key: Short): MetaFormat?
+
+internal expect fun writeJson(meta: Meta, out: Output)
+internal expect fun readJson(input: Input, length: Int = -1): Meta
+
+object JSONMetaFormat : MetaFormat {
+    override val name: String = "json"
+    override val key: Short = 0x4a53//"JS"
+
+    override suspend fun write(meta: Meta, out: Output) = writeJson(meta, out)
+    override suspend fun read(input: Input): Meta = readJson(input)
+}
+
+object BinaryMetaFormat : MetaFormat {
+    override val name: String = "bin"
+    override val key: Short = 0x4249//BI
+
+    override suspend fun write(meta: Meta, out: Output) {
+        out.writeMeta(meta)
+    }
+
+    override suspend fun read(input: Input): Meta {
+        TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
+    }
+
+    private fun Output.writeChar(char: Char) = writeByte(char.toByte())
+
+    private fun Output.writeString(str: String) {
+        writeInt(str.length)
+        writeText(str)
+    }
+
+    private fun Output.writeValue(value: Value) {
+        if (value.isList()) {
+            writeChar('L')
+            writeInt(value.list.size)
+            value.list.forEach {
+                writeValue(it)
+            }
+        } else when (value.type) {
+            ValueType.NUMBER -> when (value.value) {
+                is Short -> {
+                    writeChar('s')
+                    writeShort(value.number.toShort())
+                }
+                is Int -> {
+                    writeChar('i')
+                    writeInt(value.number.toInt())
+                }
+                is Long -> {
+                    writeChar('l')
+                    writeLong(value.number.toLong())
+                }
+                is Float -> {
+                    writeChar('f')
+                    writeFloat(value.number.toFloat())
+                }
+                else -> {
+                    writeChar('d')
+                    writeDouble(value.number.toDouble())
+                }
+            }
+            ValueType.STRING -> {
+                writeChar('S')
+                writeString(value.string)
+            }
+            ValueType.BOOLEAN -> {
+                if (value.boolean) {
+                    writeChar('+')
+                } else {
+                    writeChar('-')
+                }
+            }
+            ValueType.NULL -> {
+                writeChar('N')
+            }
+        }
+    }
+
+    private fun Output.writeMeta(meta: Meta) {
+        writeChar('M')
+        writeInt(meta.items.size)
+        meta.items.forEach { (key, item) ->
+            writeString(key)
+            when (item) {
+                is MetaItem.ValueItem -> {
+                    writeValue(item.value)
+                }
+                is MetaItem.SingleNodeItem -> {
+                    writeMeta(item.node)
+                }
+                is MetaItem.MultiNodeItem -> {
+                    writeChar('#')
+                    writeInt(item.nodes.size)
+                    item.nodes.forEach {
+                        writeMeta(it)
+                    }
+                }
+            }
+        }
+    }
+
+    private fun Input.readString(): String {
+        val length = readInt()
+        return readText(max = length)
+    }
+
+    private fun Input.readMetaItem(): MetaItem<MetaBuilder> {
+        val keyChar = readByte().toChar()
+        return when (keyChar) {
+            'S' -> MetaItem.ValueItem(StringValue(readString()))
+            'N' -> MetaItem.ValueItem(Null)
+            '+' -> MetaItem.ValueItem(True)
+            '-' -> MetaItem.ValueItem(True)
+            's' -> MetaItem.ValueItem(NumberValue(readShort()))
+            'i' -> MetaItem.ValueItem(NumberValue(readInt()))
+            'l' -> MetaItem.ValueItem(NumberValue(readInt()))
+            'f' -> MetaItem.ValueItem(NumberValue(readFloat()))
+            'd' -> MetaItem.ValueItem(NumberValue(readDouble()))
+            'L' -> {
+                val length = readInt()
+                val list = (1..length).map { (readMetaItem() as MetaItem.ValueItem).value }
+                MetaItem.ValueItem(Value.of(list))
+            }
+            'M' -> {
+                val length = readInt()
+                val meta = buildMeta {
+                    (1..length).forEach { _ ->
+                        val name = readString()
+                        val item = readMetaItem()
+                        set(name,item)
+                    }
+                }
+                MetaItem.SingleNodeItem(meta)
+            }
+            '#' -> {
+                val length = readInt()
+                val nodes = (1..length).map { (readMetaItem() as MetaItem.SingleNodeItem).node }
+                MetaItem.MultiNodeItem(nodes)
+            }
+            else -> error("Unknown serialization key character: $keyChar")
+        }
+    }
+
+}
+

dataforge-meta-io/src/commonMain/kotlin/hep/dataforge/meta/io/MetaProxy.kt

@@ -1,51 +0,0 @@
-package hep.dataforge.meta.io
-
-import hep.dataforge.meta.Meta
-import hep.dataforge.meta.MetaItem
-import hep.dataforge.meta.ValueType
-import hep.dataforge.meta.boolean
-import kotlinx.serialization.Polymorphic
-import kotlinx.serialization.Serializable
-
-/*Universal serialization*/
-
-@Serializable
-class MetaProxy(val map: Map<String, @Polymorphic MetaItemProxy>)
-
-
-@Serializable
-sealed class MetaItemProxy {
-    @Serializable
-    class NumberValueProxy(val number: Number) : MetaItemProxy()
-
-    @Serializable
-    class StringValueProxy(val string: String) : MetaItemProxy()
-
-    @Serializable
-    class BooleanValueProxy(val boolean: Boolean) : MetaItemProxy()
-
-    @Serializable
-    object NullValueProxy : MetaItemProxy()
-
-    @Serializable
-    class SingleMetaProxy(val node: MetaProxy) : MetaItemProxy()
-
-    @Serializable
-    class MetaListProxy(val list: List<@Polymorphic MetaProxy>) : MetaItemProxy()
-}
-
-
-fun Meta.toMap(): MetaProxy {
-    return MetaProxy(this.items.mapValues { (_, value) ->
-        when (value) {
-            is MetaItem.ValueItem<*> -> when (value.value.type) {
-                ValueType.NUMBER -> MetaItemProxy.NumberValueProxy(value.value.number)
-                ValueType.STRING -> MetaItemProxy.StringValueProxy(value.value.string)
-                ValueType.BOOLEAN -> MetaItemProxy.BooleanValueProxy(value.value.boolean)
-                ValueType.NULL -> MetaItemProxy.NullValueProxy
-            }
-            is MetaItem.SingleNodeItem<*> -> MetaItemProxy.SingleMetaProxy(value.node.toMap())
-            is MetaItem.MultiNodeItem<*> -> MetaItemProxy.MetaListProxy(value.nodes.map { it.toMap() })
-        }
-    })
-}

dataforge-meta-io/src/commonMain/kotlin/hep/dataforge/meta/io/Serializers.kt

@@ -6,59 +6,59 @@ import kotlinx.serialization.json.*
 
 /*Direct JSON serialization*/
 
-fun Value.toJson(): JsonElement = if (isList()) {
-    JsonArray(list.map { it.toJson() })
-} else {
-    when (type) {
-        ValueType.NUMBER -> JsonPrimitive(number)
-        ValueType.STRING -> JsonPrimitive(string)
-        ValueType.BOOLEAN -> JsonPrimitive(boolean)
-        ValueType.NULL -> JsonNull
-    }
-}
-
-fun Meta.toJSON(): JsonObject {
-    val map = this.items.mapValues { (_, value) ->
-        when (value) {
-            is MetaItem.ValueItem -> value.value.toJson()
-            is MetaItem.SingleNodeItem -> value.node.toJSON()
-            is MetaItem.MultiNodeItem -> JsonArray(value.nodes.map { it.toJSON() })
-        }
-    }
-    return JsonObject(map)
-}
-
-fun JsonPrimitive.toValue(): Value {
-    return when (this) {
-        is JsonLiteral -> LazyParsedValue(content)
-        is JsonNull -> Null
-    }
-}
-
-fun JsonObject.toMeta(): Meta {
-    return buildMeta {
-        this@toMeta.forEach { (key, value) ->
-            when (value) {
-                is JsonPrimitive -> set(key, value.toValue())
-                is JsonObject -> set(key, value.toMeta())
-                is JsonArray -> if (value.all { it is JsonPrimitive }) {
-                    set(key, ListValue(value.map { (it as JsonPrimitive).toValue() }))
-                } else {
-                    set(
-                            key,
-                            value.map {
-                                if (it is JsonObject) {
-                                    it.toMeta()
-                                } else {
-                                    buildMeta { "@value" to it.primitive.toValue() }
-                                }
-                            }
-                    )
-                }
-            }
-        }
-    }
-}
+//fun Value.toJson(): JsonElement = if (isList()) {
+//    JsonArray(list.map { it.toJson() })
+//} else {
+//    when (type) {
+//        ValueType.NUMBER -> JsonPrimitive(number)
+//        ValueType.STRING -> JsonPrimitive(string)
+//        ValueType.BOOLEAN -> JsonPrimitive(boolean)
+//        ValueType.NULL -> JsonNull
+//    }
+//}
+//
+//fun Meta.toJSON(): JsonObject {
+//    val map = this.items.mapValues { (_, value) ->
+//        when (value) {
+//            is MetaItem.ValueItem -> value.value.toJson()
+//            is MetaItem.SingleNodeItem -> value.node.toJSON()
+//            is MetaItem.MultiNodeItem -> JsonArray(value.nodes.map { it.toJSON() })
+//        }
+//    }
+//    return JsonObject(map)
+//}
+//
+//fun JsonPrimitive.toValue(): Value {
+//    return when (this) {
+//        is JsonLiteral -> LazyParsedValue(content)
+//        is JsonNull -> Null
+//    }
+//}
+//
+//fun JsonObject.toMeta(): Meta {
+//    return buildMeta {
+//        this@toMeta.forEach { (key, value) ->
+//            when (value) {
+//                is JsonPrimitive -> set(key, value.toValue())
+//                is JsonObject -> set(key, value.toMeta())
+//                is JsonArray -> if (value.all { it is JsonPrimitive }) {
+//                    set(key, ListValue(value.map { (it as JsonPrimitive).toValue() }))
+//                } else {
+//                    set(
+//                            key,
+//                            value.map {
+//                                if (it is JsonObject) {
+//                                    it.toMeta()
+//                                } else {
+//                                    buildMeta { "@value" to it.primitive.toValue() }
+//                                }
+//                            }
+//                    )
+//                }
+//            }
+//        }
+//    }
+//}
 
 /*Direct CBOR serialization*/
 
@@ -67,45 +67,6 @@ fun JsonObject.toMeta(): Meta {
 //        encodeNumber(char.toByte().toLong())
 //    }
 //
-//    fun CBOR.CBOREncoder.encodeValue(value: Value) {
-//        if (value.isList()) {
-//            encodeChar('L')
-//            startArray()
-//            value.list.forEach {
-//                encodeValue(it)
-//            }
-//            end()
-//        } else when (value.type) {
-//            ValueType.NUMBER -> when (value.value) {
-//                is Int, is Short, is Long -> {
-//                    encodeChar('i')
-//                    encodeNumber(value.number.toLong())
-//                }
-//                is Float -> {
-//                    encodeChar('f')
-//                    encodeFloat(value.number.toFloat())
-//                }
-//                else -> {
-//                    encodeChar('d')
-//                    encodeDouble(value.number.toDouble())
-//                }
-//            }
-//            ValueType.STRING -> {
-//                encodeChar('S')
-//                encodeString(value.string)
-//            }
-//            ValueType.BOOLEAN -> {
-//                if (value.boolean) {
-//                    encodeChar('+')
-//                } else {
-//                    encodeChar('-')
-//                }
-//            }
-//            ValueType.NULL -> {
-//                encodeChar('N')
-//            }
-//        }
-//    }
 //
 //    fun CBOR.CBOREncoder.encodeMeta(meta: Meta) {
 //        meta.items.forEach { (key, item) ->

dataforge-meta-io/src/commonTest/kotlin/io/MetaItemProxyTest.kt

@@ -1,47 +0,0 @@
-package io
-
-import hep.dataforge.meta.buildMeta
-import hep.dataforge.meta.io.MetaItemProxy
-import hep.dataforge.meta.io.toMap
-import kotlinx.serialization.json.JSON
-import kotlinx.serialization.serializer
-import kotlin.test.Test
-
-class MetaItemProxyTest {
-    @Test
-    fun testGeneration() {
-        MetaItemProxy::class.serializer()
-    }
-
-
-    @Test
-    fun testProxySerialization() {
-        val meta = buildMeta {
-            "a" to 2
-            "b" to {
-                "c" to "ddd"
-                "d" to 2.2
-            }
-        }
-        val json = JSON.indented.stringify(meta.toMap())
-        println(json)
-//        val result: Map<String, MetaItemProxy> = JSON.parse(json)
-//        assertEquals(meta,result.to)
-    }
-
-//    @Test
-//    fun testJSONSerialization() {
-//        val meta = buildMeta {
-//            "a" to 2
-//            "b" to {
-//                "c" to "ddd"
-//                "d" to 2.2
-//            }
-//        }
-//        val json = meta.toJSON()
-//        println(json)
-//        val result = json.toMeta()
-//        assertEquals(meta, result)
-//    }
-
-}

dataforge-meta-io/src/jsMain/kotlin/hep/dataforge/meta/io/JSMeta.kt

@@ -0,0 +1,36 @@
+package hep.dataforge.meta.io
+
+import hep.dataforge.meta.Meta
+import hep.dataforge.meta.MetaItem
+import hep.dataforge.meta.Value
+
+/**
+ * Represent any js object as meta
+ */
+class JSMeta(val obj: Any) : Meta {
+    override val items: Map<String, MetaItem<out Meta>>
+        get() = listKeys(obj).associateWith { convert(js("obj[it]")) }
+
+    private fun listKeys(obj: Any): List<String> = js("Object").keys(obj) as List<String>
+
+    private fun isList(obj: Any): Boolean = js("Array").isArray(obj) as Boolean
+
+    private fun isPrimitive(obj: Any?): Boolean = js("obj !== Object(obj)") as Boolean
+
+    private fun convert(obj: Any?): MetaItem<out Meta> {
+        return when (obj) {
+            null, isPrimitive(obj), is Number, is String, is Boolean -> MetaItem.ValueItem<JSMeta>(Value.of(obj))
+            isList(obj) -> {
+                val list = obj as List<*>
+                //if first value is primitive, treat as value
+                if (isPrimitive(list.first())) {
+                    MetaItem.ValueItem<JSMeta>(Value.of(list))
+                } else {
+                    //else treat as meta list
+                    MetaItem.MultiNodeItem(list.map { JSMeta(it!!) })
+                }
+            }
+            else -> MetaItem.SingleNodeItem(JSMeta(obj))
+        }
+    }
+}

dataforge-meta-io/src/jsMain/kotlin/hep/dataforge/meta/io/JSONMetaFormat.kt

@@ -0,0 +1,17 @@
+package hep.dataforge.meta.io
+
+import hep.dataforge.meta.Meta
+import kotlinx.io.core.Input
+import kotlinx.io.core.Output
+import kotlinx.io.core.readText
+import kotlinx.io.core.writeText
+import kotlin.js.Json
+
+internal actual fun writeJson(meta: Meta, out: Output) {
+    out.writeText(JSON.stringify(meta))
+}
+
+internal actual fun readJson(input: Input, length: Int): Meta {
+    val json: Json = JSON.parse(input.readText(max = if (length > 0) length else Int.MAX_VALUE))
+    return JSMeta(json)
+}

dataforge-meta-io/src/jsTest/kotlin/hep/dataforge/meta/JSMetaTest.kt

@@ -0,0 +1,18 @@
+package hep.dataforge.meta
+
+import hep.dataforge.meta.io.JSMeta
+import kotlin.js.json
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class JSMetaTest{
+    @Test
+    fun testConverstion(){
+        val test = json(
+                "a" to 2,
+                "b" to "ddd"
+        )
+        val meta = JSMeta(test)
+        assertEquals(2, meta["a"]!!.int)
+    }
+}

dataforge-meta-io/src/jvmMain/kotlin/hep/dataforge/meta/io/JSONMetaFormat.kt

@@ -0,0 +1,118 @@
+package hep.dataforge.meta.io
+
+import com.github.cliftonlabs.json_simple.JsonArray
+import com.github.cliftonlabs.json_simple.JsonObject
+import com.github.cliftonlabs.json_simple.Jsoner
+import hep.dataforge.meta.*
+import kotlinx.io.core.*
+import java.io.ByteArrayInputStream
+import java.io.InputStreamReader
+import java.io.Reader
+import java.text.ParseException
+
+internal actual fun writeJson(meta: Meta, out: Output) {
+    val json = meta.toJson()
+    val string = Jsoner.prettyPrint(Jsoner.serialize(json))
+    out.writeText(string)
+}
+
+private fun Value.toJson(): Any {
+    return if (list.size == 1) {
+        when (type) {
+            ValueType.NUMBER -> number
+            ValueType.BOOLEAN -> boolean
+            else -> string
+        }
+    } else {
+        JsonArray().apply {
+            list.forEach { add(it.toJson()) }
+        }
+    }
+}
+
+private fun Meta.toJson(): JsonObject {
+    val builder = JsonObject()
+    items.forEach { name, item ->
+        when (item) {
+            is MetaItem.ValueItem -> builder[name] = item.value.toJson()
+            is MetaItem.SingleNodeItem -> builder[name] = item.node.toJson()
+            is MetaItem.MultiNodeItem -> {
+                val array = JsonArray()
+                item.nodes.forEach { array.add(it.toJson()) }
+                builder[name] = array
+            }
+        }
+    }
+    return builder
+}
+
+
+internal actual fun readJson(input: Input, length: Int): Meta {
+    return if (length == 0) {
+        EmptyMeta
+    } else {
+        val json = if (length > 0) {
+            //Read into intermediate buffer
+            val buffer = ByteArray(length)
+            input.readAvailable(buffer, length)
+            Jsoner.deserialize(InputStreamReader(ByteArrayInputStream(buffer), Charsets.UTF_8)) as JsonObject
+        } else {
+            //automatic
+            val reader = object : Reader() {
+                override fun close() {
+                    input.close()
+                }
+
+                override fun read(cbuf: CharArray, off: Int, len: Int): Int {
+                    val block = input.readText(Charsets.UTF_8, len).toCharArray()
+                    System.arraycopy(block, 0, cbuf, off, block.size)
+                    return block.size
+                }
+
+            }
+            Jsoner.deserialize(reader) as JsonObject
+        }
+        json.toMeta()
+    }
+}
+
+@Throws(ParseException::class)
+private fun JsonObject.toMeta(): Meta {
+    return buildMeta {
+        this@toMeta.forEach { key, value -> appendValue(key as String, value) }
+    }
+}
+
+private fun JsonArray.toListValue(): Value {
+    val list: List<Value> = this.map { value ->
+        when (value) {
+            null -> Null
+            is JsonArray -> value.toListValue()
+            is Number -> NumberValue(value)
+            is Boolean -> if (value) True else False
+            is String -> LazyParsedValue(value)
+            is JsonObject -> error("Object values inside multidimensional arrays are not allowed")
+            else -> error("Unknown token $value in json")
+        }
+    }
+    return Value.of(list)
+}
+
+private fun MetaBuilder.appendValue(key: String, value: Any?) {
+    when (value) {
+        is JsonObject -> this[key] = value.toMeta()
+        is JsonArray -> {
+            value.forEach {
+                if (it is JsonArray) {
+                    this[key] = it.toListValue()
+                } else {
+                    appendValue(key, it)
+                }
+            }
+        }
+        is Number -> this[key] = NumberValue(value)
+        is Boolean -> this[key] = value
+        is String -> this[key] = LazyParsedValue(value)
+        //ignore anything else
+    }
+}

dataforge-meta/build.gradle

@@ -1,6 +1,5 @@
 plugins {
-    id 'kotlin-multiplatform'// version '1.3.0-rc-57'
-    id 'kotlinx-serialization'
+    id 'kotlin-multiplatform'
 }
 repositories {
     maven { url = 'http://dl.bintray.com/kotlin/kotlin-eap' }
@@ -18,41 +17,35 @@ kotlin {
     sourceSets {
         commonMain {
             dependencies {
-                implementation "org.jetbrains.kotlin:kotlin-stdlib-common"
-                implementation 'org.jetbrains.kotlin:kotlin-reflect'
-                implementation "org.jetbrains.kotlinx:kotlinx-io:$kotlinx_io_version"
-                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:$serialization_version"
+                api "org.jetbrains.kotlin:kotlin-stdlib-common"
+
             }
         }
         commonTest {
             dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-test-common'
-                implementation 'org.jetbrains.kotlin:kotlin-test-annotations-common'
-                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:$serialization_version"
+                api 'org.jetbrains.kotlin:kotlin-test-common'
+                api 'org.jetbrains.kotlin:kotlin-test-annotations-common'
             }
         }
         jvmMain {
             dependencies {
-                implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
-                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime:$serialization_version"
+                api "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
             }
         }
         jvmTest {
             dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-test'
-                implementation 'org.jetbrains.kotlin:kotlin-test-junit'
+                api 'org.jetbrains.kotlin:kotlin-test'
+                api 'org.jetbrains.kotlin:kotlin-test-junit'
             }
         }
         jsMain {
             dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-stdlib-js'
-                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-js:$serialization_version"
+                api 'org.jetbrains.kotlin:kotlin-stdlib-js'
             }
         }
         jsTest {
             dependencies {
-                implementation 'org.jetbrains.kotlin:kotlin-test-js'
-                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-js:$serialization_version"
+                api 'org.jetbrains.kotlin:kotlin-test-js'
             }
         }
 //        iosMain {

dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/Meta.kt

@@ -10,34 +10,9 @@ import hep.dataforge.names.toName
  * * a list of nodes
  */
 sealed class MetaItem<M : Meta> {
-    class ValueItem<M : Meta>(val value: Value) : MetaItem<M>(){
-        override fun equals(other: Any?): Boolean {
-            return this.value == (other as? ValueItem<*>)?.value
-        }
-
-        override fun hashCode(): Int {
-            return value.hashCode()
-        }
-    }
-    class SingleNodeItem<M : Meta>(val node: M) : MetaItem<M>(){
-        override fun equals(other: Any?): Boolean {
-            return this.node == (other as? SingleNodeItem<*>)?.node
-        }
-
-        override fun hashCode(): Int {
-            return node.hashCode()
-        }
-    }
-
-    class MultiNodeItem<M : Meta>(val nodes: List<M>) : MetaItem<M>(){
-        override fun equals(other: Any?): Boolean {
-            return this.nodes == (other as? MultiNodeItem<*>)?.nodes
-        }
-
-        override fun hashCode(): Int {
-            return nodes.hashCode()
-        }
-    }
+    data class ValueItem<M : Meta>(val value: Value) : MetaItem<M>()
+    data class SingleNodeItem<M : Meta>(val node: M) : MetaItem<M>()
+    data class MultiNodeItem<M : Meta>(val nodes: List<M>) : MetaItem<M>()
 }
 
 operator fun <M : Meta> List<M>.get(query: String): M? {

dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/MetaBuilder.kt

@@ -45,4 +45,4 @@ fun Meta.builder(): MetaBuilder {
     }
 }
 
-fun buildMeta(builder: MetaBuilder.() -> Unit): Meta = MetaBuilder().apply(builder)
+fun buildMeta(builder: MetaBuilder.() -> Unit): MetaBuilder = MetaBuilder().apply(builder)

settings.gradle

@@ -28,5 +28,4 @@ rootProject.name = 'dataforge-core'
 
 include ":dataforge-meta"
 include ":dataforge-meta-io"
-
-include ":dataforge-envelope"
+//include ":dataforge-envelope"