Add ordering to name indices

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 ### Added
+- Name index comparator
 
 ### Changed
 
@@ -11,6 +12,7 @@
 ### Removed
 
 ### Fixed
+- `listOfScheme` and `listOfConvertable` delegates provides correct items order
 
 ### Security
 

build.gradle.kts

@@ -8,7 +8,7 @@ plugins {
 
 allprojects {
     group = "space.kscience"
-    version = "0.8.0"
+    version = "0.8.1-dev-1"
 }
 
 subprojects {

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

@@ -11,6 +11,7 @@ import space.kscience.dataforge.io.PartDescriptor.Companion.PARTS_KEY
 import space.kscience.dataforge.io.PartDescriptor.Companion.SEPARATOR_KEY
 import space.kscience.dataforge.meta.*
 import space.kscience.dataforge.names.asName
+import space.kscience.dataforge.names.getIndexedList
 import space.kscience.dataforge.names.plus
 
 private class PartDescriptor : Scheme() {
@@ -84,7 +85,7 @@ public fun EnvelopeBuilder.envelopes(
 public fun Envelope.parts(): EnvelopeParts {
     if (data == null) return emptyList()
     //TODO add zip folder reader
-    val parts = meta.getIndexed(PARTS_KEY).values.map {
+    val parts = meta.getIndexedList(PARTS_KEY).map {
         PartDescriptor.read(it)
     }
     return if (parts.isEmpty()) {

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

@@ -4,6 +4,7 @@ import space.kscience.dataforge.meta.descriptors.MetaDescriptor
 import space.kscience.dataforge.misc.DFExperimental
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.asName
+import space.kscience.dataforge.names.getIndexedList
 import kotlin.properties.ReadWriteProperty
 import kotlin.reflect.KProperty
 
@@ -65,7 +66,7 @@ public fun <T> MutableMeta.listOfConvertable(
 ): ReadWriteProperty<Any?, List<T>> = object : ReadWriteProperty<Any?, List<T>> {
     override fun getValue(thisRef: Any?, property: KProperty<*>): List<T> {
         val name = key ?: property.name.asName()
-        return getIndexed(name).values.map { converter.read(it) }
+        return getIndexedList(name).map { converter.read(it) }
     }
 
     override fun setValue(thisRef: Any?, property: KProperty<*>, value: List<T>) {

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

@@ -18,7 +18,7 @@ import kotlin.reflect.KProperty1
  */
 public open class Scheme(
     private var prototype: Meta? = null,
-    descriptor: MetaDescriptor? = null
+    descriptor: MetaDescriptor? = null,
 ) : Described, MetaRepr, MutableMetaProvider, Configurable {
 
     /**
@@ -197,7 +197,6 @@ public open class SchemeSpec<T : Scheme>(
 }
 
 
-
 /**
  * Update a [MutableMeta] using given specification
  */
@@ -275,7 +274,7 @@ public fun <T : Scheme> MutableMeta.listOfScheme(
 ): ReadWriteProperty<Any?, List<T>> = object : ReadWriteProperty<Any?, List<T>> {
     override fun getValue(thisRef: Any?, property: KProperty<*>): List<T> {
         val name = key ?: property.name.asName()
-        return getIndexed(name).values.map { spec.write(it as MutableMeta) }
+        return getIndexedList(name).map { spec.write(it as MutableMeta) }
     }
 
     override fun setValue(thisRef: Any?, property: KProperty<*>, value: List<T>) {

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

@@ -0,0 +1,30 @@
+package space.kscience.dataforge.names
+
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.getIndexed
+
+
+/**
+ * A comparator for indices in a [Name]. If both indices are integers, compare them as integers.
+ * Null always stays "before" non-null index.
+ */
+public object NameIndexComparator : Comparator<String?> {
+    override fun compare(a: String?, b: String?): Int {
+        if (a == b) return 0
+        if (a == null) return 1
+        if (b == null) return -1
+        val aInt = a.toIntOrNull()
+        val bInt = b.toIntOrNull()
+        return if (aInt != null && bInt != null) {
+            aInt.compareTo(bInt)
+        } else {
+            a.compareTo(b)
+        }
+    }
+
+}
+
+public fun Meta.getIndexedList(name: Name): List<Meta> = getIndexed(name).entries.sortedWith(
+    //sort by index
+    compareBy(space.kscience.dataforge.names.NameIndexComparator) { it.key }
+).map{it.value}

dataforge-meta/src/commonTest/kotlin/space/kscience/dataforge/meta/ObservableMetaTest.kt

@@ -17,8 +17,6 @@ class ObservableMetaTest {
             }
         }.asObservable()
 
-        println(meta)
-
         assertEquals("scatter", meta["data.type"].string)
     }