Fixed json conversion issue for new Meta structure.

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

@@ -4,6 +4,7 @@ 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 hep.dataforge.names.toName
 import kotlinx.io.core.*
 import java.io.ByteArrayInputStream
 import java.io.InputStreamReader
@@ -97,13 +98,19 @@ 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()
+            if (value.none { it is JsonObject }) {
+                //If all values are primitives or arrays
+                this[key] = value.toListValue()
             } else {
-                    appendValue(key, it)
+                val list = value.map<Any, Meta> {
+                    when(it){
+                        is JsonObject -> it.toMeta()
+                        is JsonArray -> it.toListValue().toMeta()
+                        else -> Value.of(it).toMeta()
                     }
                 }
+                setIndexed(key.toName(),list)
+            }
         }
         is Number -> this[key] = NumberValue(value)
         is Boolean -> this[key] = value

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

@@ -35,6 +35,8 @@ interface Meta {
     }
 }
 
+/* Get operations*/
+
 /**
  * Fast [String]-based accessor for item map
  */
@@ -51,10 +53,22 @@ operator fun Meta.get(name: Name): MetaItem<out Meta>? {
 }
 
 operator fun Meta.get(token: NameToken): MetaItem<out Meta>? = items[token]
-
-//TODO create Java helper for meta operations
 operator fun Meta.get(key: String): MetaItem<out Meta>? = get(key.toName())
 
+/**
+ * Get all items matching given name.
+ */
+fun Meta.getByName(name: Name): Map<String, MetaItem<out Meta>> {
+    if (name.length == 0) error("Can't use empty name for that")
+    val (body, query) = name.last()!!
+    val regex = query.toRegex()
+    return (this[name.cutLast()] as? NodeItem<*>)?.node?.items
+            ?.filter { it.key.body == body && (query.isEmpty()|| regex.matches(it.key.query)) }
+            ?.mapKeys { it.key.query }
+            ?: emptyMap()
+
+}
+
 /**
  * A meta node that ensures that all of its descendants has at least the same type
  */
@@ -91,6 +105,7 @@ abstract class MetaNode<M : MetaNode<M>> : Meta {
  * If the argument is possibly mutable node, it is copied on creation
  */
 class SealedMeta internal constructor(override val items: Map<NameToken, MetaItem<SealedMeta>>) : MetaNode<SealedMeta>()
+
 /**
  * Generate sealed node from [this]. If it is already sealed return it as is
  */
@@ -133,3 +148,5 @@ val <M : Meta> MetaItem<M>.node: M
 interface Metoid {
     val meta: Meta
 }
+
+fun Value.toMeta() = buildMeta { Meta.VALUE_KEY to this }

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

@@ -105,7 +105,6 @@ operator fun <M : MutableMeta<M>> M.set(name: String, value: Value) = set(name.t
 operator fun <M : MutableMetaNode<M>> M.set(name: String, meta: Meta) = set(name.toName(), meta)
 operator fun <M : MutableMeta<M>> M.set(token: NameToken, item: MetaItem<M>?) = set(token.toName(), item)
 
-
 /**
  * Universal set method
  */
@@ -134,16 +133,20 @@ fun <M : MutableMetaNode<M>> M.update(meta: Meta) {
     }
 }
 
-// Same name siblings generation
+/* Same name siblings generation */
 
-fun <M : MutableMetaNode<M>> M.setIndexed(name: Name, metas: Iterable<Meta>, queryFactory: (Int) -> String = { it.toString() }) {
+fun <M : MutableMeta<M>> M.setIndexed(name: Name, items: Iterable<MetaItem<M>>, queryFactory: (Int) -> String = { it.toString() }) {
     val tokens = name.tokens.toMutableList()
     val last = tokens.last()
-    metas.forEachIndexed { index, meta ->
+    items.forEachIndexed { index, meta ->
         val indexedToken = NameToken(last.body, last.query + queryFactory(index))
         tokens[tokens.lastIndex] = indexedToken
         set(Name(tokens), meta)
     }
 }
 
+fun <M : MutableMetaNode<M>> M.setIndexed(name: Name, metas: Iterable<Meta>, queryFactory: (Int) -> String = { it.toString() }) {
+    setIndexed(name, metas.map { wrap(name, it) }, queryFactory)
+}
+
 operator fun <M : MutableMetaNode<M>> M.set(name: Name, metas: Iterable<Meta>) = setIndexed(name, metas)

dataforge-meta/src/commonMain/kotlin/hep/dataforge/names/Name.kt

@@ -22,12 +22,12 @@ class Name internal constructor(val tokens: List<NameToken>) {
     fun last(): NameToken? = tokens.lastOrNull()
 
     /**
-     * The reminder of the name after first element is cut
+     * The reminder of the name after first element is cut. For empty name return itself.
      */
     fun cutFirst(): Name = Name(tokens.drop(1))
 
     /**
-     * The reminder of the name after last element is cut
+     * The reminder of the name after last element is cut. For empty name return itself.
      */
     fun cutLast(): Name = Name(tokens.dropLast(1))