Transformation of Meta to Map and back

dataforge-io/dataforge-io-yaml/build.gradle.kts

@@ -1,9 +0,0 @@
-plugins {
-    id("scientifik.jvm")
-}
-
-description = "YAML meta IO"
-
-dependencies{
-    api(project(":dataforge-io"))
-}

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

@@ -1,7 +0,0 @@
-package hep.dataforge.meta
-
-/**
- * General marker for dataforge builders
- */
-@DslMarker
-annotation class DFBuilder

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

@@ -4,8 +4,6 @@ import hep.dataforge.names.NameToken
 
 /**
  * A meta laminate consisting of multiple immutable meta layers. For mutable front layer, use [Styled].
- *
- *
  */
 class Laminate(layers: List<Meta>) : MetaBase() {
 

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

@@ -80,27 +80,6 @@ operator fun Meta?.get(name: Name): MetaItem<*>? {
 operator fun Meta?.get(token: NameToken): MetaItem<*>? = this?.items?.get(token)
 operator fun Meta?.get(key: String): MetaItem<*>? = get(key.toName())
 
-/**
- * Get all items matching given name.
- */
-fun Meta.getAll(name: Name): Map<String, MetaItem<*>> {
-    val root = when (name.length) {
-        0 -> error("Can't use empty name for that")
-        1 -> this
-        else -> (this[name.cutLast()] as? NodeItem<*>)?.node
-    }
-
-    val (body, index) = name.last()!!
-    val regex = index.toRegex()
-
-    return root?.items
-        ?.filter { it.key.body == body && (index.isEmpty() || regex.matches(it.key.index)) }
-        ?.mapKeys { it.key.index }
-        ?: emptyMap()
-}
-
-fun Meta.getAll(name: String): Map<String, MetaItem<*>> = getAll(name.toName())
-
 /**
  * Get a sequence of [Name]-[Value] pairs
  */
@@ -138,27 +117,6 @@ interface MetaNode<M : MetaNode<M>> : Meta {
     override val items: Map<NameToken, MetaItem<M>>
 }
 
-/**
- * Get all items matching given name.
- */
-fun <M : MetaNode<M>> M.getAll(name: Name): Map<String, MetaItem<M>> {
-    val root: MetaNode<M>? = when (name.length) {
-        0 -> error("Can't use empty name for that")
-        1 -> this
-        else -> (this[name.cutLast()] as? NodeItem<M>)?.node
-    }
-
-    val (body, index) = name.last()!!
-    val regex = index.toRegex()
-
-    return root?.items
-        ?.filter { it.key.body == body && (index.isEmpty() || regex.matches(it.key.index)) }
-        ?.mapKeys { it.key.index }
-        ?: emptyMap()
-}
-
-fun <M : MetaNode<M>> M.getAll(name: String): Map<String, MetaItem<M>> = getAll(name.toName())
-
 operator fun <M : MetaNode<M>> MetaNode<M>?.get(name: Name): MetaItem<M>? {
     if (this == null) return null
     return name.first()?.let { token ->
@@ -229,7 +187,6 @@ object EmptyMeta : MetaBase() {
 /**
  * Unsafe methods to access values and nodes directly from [MetaItem]
  */
-
 val MetaItem<*>?.value: Value?
     get() = (this as? ValueItem)?.value
         ?: (this?.node?.get(VALUE_KEY) as? ValueItem)?.value
@@ -258,11 +215,4 @@ val <M : Meta> MetaItem<M>?.node: M?
         is NodeItem -> node
     }
 
-/**
+fun Meta.isEmpty() = this === EmptyMeta || this.items.isEmpty()
- * Generic meta-holder object
- */
-interface Metoid {
-    val meta: Meta
-}
-
-fun Meta.isEmpty() = this === EmptyMeta || this.items.isEmpty()

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

@@ -0,0 +1,11 @@
+package hep.dataforge.meta
+
+/**
+ * General marker for dataforge builders
+ */
+@DslMarker
+annotation class DFBuilder
+
+@Experimental(level = Experimental.Level.WARNING)
+@Retention(AnnotationRetention.BINARY)
+annotation class DFExperimental

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

@@ -0,0 +1,36 @@
+package hep.dataforge.meta
+
+import hep.dataforge.values.Value
+
+///**
+// * Find all elements with given body
+// */
+//private fun Meta.byBody(body: String): Map<String, MetaItem<*>> =
+//    items.filter { it.key.body == body }.mapKeys { it.key.index }
+//
+//private fun Meta.distinctNames() = items.keys.map { it.body }.distinct()
+
+/**
+ * Convert meta to map of maps
+ */
+fun Meta.toMap(): Map<String, Any?> {
+    return items.entries.associate { (token, item) ->
+        token.toString() to when (item) {
+            is MetaItem.NodeItem -> item.node.toMap()
+            is MetaItem.ValueItem -> item.value.value
+        }
+    }
+}
+
+/**
+ * Convert map of maps to meta
+ */
+fun Map<String, Any?>.toMeta(): Meta = buildMeta {
+    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))
+        }
+    }
+}

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

@@ -28,15 +28,21 @@ class StringDelegate(val meta: Meta, private val key: String? = null, private va
     }
 }
 
-class BooleanDelegate(val meta: Meta, private val key: String? = null, private val default: Boolean? = null) :
+class BooleanDelegate(
-    ReadOnlyProperty<Metoid, Boolean?> {
+    val meta: Meta,
-    override fun getValue(thisRef: Metoid, property: KProperty<*>): Boolean? {
+    private val key: String? = null,
+    private val default: Boolean? = null
+) : ReadOnlyProperty<Any?, Boolean?> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): Boolean? {
         return meta[key ?: property.name]?.boolean ?: default
     }
 }
 
-class NumberDelegate(val meta: Meta, private val key: String? = null, private val default: Number? = null) :
+class NumberDelegate(
-    ReadOnlyProperty<Any?, Number?> {
+    val meta: Meta,
+    private val key: String? = null,
+    private val default: Number? = null
+) : ReadOnlyProperty<Any?, Number?> {
     override fun getValue(thisRef: Any?, property: KProperty<*>): Number? {
         return meta[key ?: property.name]?.number ?: default
     }
@@ -168,9 +174,6 @@ fun Meta.number(key: String? = null, default: () -> Number) =
 inline fun <reified E : Enum<E>> Meta.enum(default: E, key: String? = null) =
     SafeEnumDelegate(this, key, default) { enumValueOf(it) }
 
-
-fun <T : Metoid> Metoid.node(key: String? = null, converter: (Meta) -> T) = ChildDelegate(meta, key, converter)
-
 /* Read-write delegates */
 
 class MutableValueDelegate<M : MutableMeta<M>>(

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

@@ -0,0 +1,51 @@
+package hep.dataforge.meta
+
+import hep.dataforge.names.Name
+import hep.dataforge.names.toName
+
+/**
+ * Get all items matching given name.
+ */
+@DFExperimental
+fun Meta.getAll(name: Name): Map<String, MetaItem<*>> {
+    val root = when (name.length) {
+        0 -> error("Can't use empty name for that")
+        1 -> this
+        else -> (this[name.cutLast()] as? MetaItem.NodeItem<*>)?.node
+    }
+
+    val (body, index) = name.last()!!
+    val regex = index.toRegex()
+
+    return root?.items
+        ?.filter { it.key.body == body && (index.isEmpty() || regex.matches(it.key.index)) }
+        ?.mapKeys { it.key.index }
+        ?: emptyMap()
+}
+
+@DFExperimental
+fun Meta.getAll(name: String): Map<String, MetaItem<*>> = getAll(name.toName())
+
+
+/**
+ * Get all items matching given name.
+ */
+@DFExperimental
+fun <M : MetaNode<M>> M.getAll(name: Name): Map<String, MetaItem<M>> {
+    val root: MetaNode<M>? = when (name.length) {
+        0 -> error("Can't use empty name for that")
+        1 -> this
+        else -> (this[name.cutLast()] as? MetaItem.NodeItem<M>)?.node
+    }
+
+    val (body, index) = name.last()!!
+    val regex = index.toRegex()
+
+    return root?.items
+        ?.filter { it.key.body == body && (index.isEmpty() || regex.matches(it.key.index)) }
+        ?.mapKeys { it.key.index }
+        ?: emptyMap()
+}
+
+@DFExperimental
+fun <M : MetaNode<M>> M.getAll(name: String): Map<String, MetaItem<M>> = getAll(name.toName())

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

@@ -30,4 +30,23 @@ class MetaTest {
         }.seal()
         assertEquals<Meta>(meta1, meta2)
     }
+
+    @Test
+    fun metaToMap(){
+        val meta = buildMeta {
+            "a" to 22
+            "b" to {
+                "c" to "ddd"
+            }
+            "list" to (0..4).map {
+                buildMeta {
+                    "value" to it
+                }
+            }
+        }
+        val map = meta.toMap()
+        val reconstructed = map.toMeta()
+
+        assertEquals(meta,reconstructed)
+    }
 }

settings.gradle.kts

@@ -24,7 +24,6 @@ enableFeaturePreview("GRADLE_METADATA")
 include(
     ":dataforge-meta",
     ":dataforge-io",
-    ":dataforge-io:dataforge-io-yaml",
     ":dataforge-context",
     ":dataforge-data",
     ":dataforge-output",