Add a Config generator to MetaTransformation

build.gradle.kts

@@ -6,7 +6,7 @@ plugins {
     id("scientifik.publish") version toolsVersion apply false
 }
 
-val dataforgeVersion by extra("0.1.6-dev-1")
+val dataforgeVersion by extra("0.1.6-dev-2")
 
 val bintrayRepo by extra("dataforge")
 val githubProject by extra("dataforge-core")

dataforge-io/dataforge-io-yaml/src/test/kotlin/hep/dataforge/io/yaml/YamlMetaFormatTest.kt

@@ -34,7 +34,7 @@ class YamlMetaFormatTest {
         assertEquals<Meta>(meta, meta.seal())
 
         meta.items.keys.forEach {
-            if (meta[it] != result[it]) error("${meta[it]} != ${result[it]}")
+            assertEquals(meta[it],result[it],"${meta[it]} != ${result[it]}")
         }
 
         assertEquals(meta, result)

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

@@ -1,8 +1,8 @@
-@file:Suppress("UNUSED_PARAMETER")
-
 package hep.dataforge.meta
 
 import hep.dataforge.meta.descriptors.NodeDescriptor
+import hep.dataforge.names.toName
+import hep.dataforge.values.ListValue
 import hep.dataforge.values.Value
 
 /**
@@ -18,14 +18,29 @@ fun Meta.toMap(descriptor: NodeDescriptor? = null): Map<String, Any?> {
 }
 
 /**
- * Convert map of maps to meta
+ * Convert map of maps to meta. This method will recognize [MetaItem], [Map]<String,Any?> and [List] of all mentioned above as value.
+ * All other values will be converted to values.
  */
+@DFExperimental
 fun Map<String, Any?>.toMeta(descriptor: NodeDescriptor? = null): Meta = Meta {
-    entries.forEach { (key, value) ->
     @Suppress("UNCHECKED_CAST")
-        when (value) {
-            is Map<*, *> -> setNode(key, (value as Map<String, Any?>).toMeta())
-            else -> setValue(key, Value.of(value))
+    fun toItem(value: Any?): MetaItem<*> = when (value) {
+        is MetaItem<*> -> value
+        is Meta -> MetaItem.NodeItem(value)
+        is Map<*, *> -> MetaItem.NodeItem((value as Map<String, Any?>).toMeta())
+        else -> MetaItem.ValueItem(Value.of(value))
+    }
+
+    entries.forEach { (key, value) ->
+        if (value is List<*>) {
+            val items = value.map { toItem(it) }
+            if (items.all { it is MetaItem.ValueItem }) {
+                setValue(key, ListValue(items.map { it.value!! }))
+            } else {
+                setIndexedItems(key.toName(), value.map { toItem(it) })
+            }
+        } else {
+            setItem(key, toItem(value))
         }
     }
 }

dataforge-meta/src/commonMain/kotlin/hep/dataforge/meta/transformations/MetaTransformation.kt

@@ -22,7 +22,7 @@ interface TransformationRule {
         meta.sequence().filter { matches(it.first, it.second) }.map { it.first }
 
     /**
-     * Apply transformation for a single item (Node or Value) and return resulting tree with absolute path
+     * Apply transformation for a single item (Node or Value) to the target
      */
     fun <M : MutableMeta<M>> transformItem(name: Name, item: MetaItem<*>?, target: M): Unit
 }
@@ -89,7 +89,7 @@ inline class MetaTransformation(val transformations: Collection<TransformationRu
     /**
      * Produce new meta using only those items that match transformation rules
      */
-    fun transform(source: Meta): Meta =
+    fun generate(source: Meta): Meta =
         Meta {
             transformations.forEach { rule ->
                 rule.selectItems(source).forEach { name ->
@@ -98,6 +98,20 @@ inline class MetaTransformation(val transformations: Collection<TransformationRu
             }
         }
 
+    /**
+     * Generate an observable configuration that contains only elements defined by transformation rules and changes with the source
+     */
+    @DFExperimental
+    fun generate(source: Config): ObservableMeta = Config().apply {
+        transformations.forEach { rule ->
+            rule.selectItems(source).forEach { name ->
+                rule.transformItem(name, source[name], this)
+            }
+        }
+
+        bind(source, this)
+    }
+
     /**
      * Transform a meta, replacing all elements found in rules with transformed entries
      */

dataforge-meta/src/commonTest/kotlin/hep/dataforge/meta/MetaTest.kt

@@ -31,6 +31,7 @@ class MetaTest {
         assertEquals<Meta>(meta1, meta2)
     }
 
+    @OptIn(DFExperimental::class)
     @Test
     fun metaToMap() {
         val meta = Meta {