WIP Root object model

cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/TGeoManager.kt

@@ -1,8 +1,9 @@
 package ru.mipt.npm.root
 
-import kotlinx.serialization.Serializable
+import kotlinx.serialization.*
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonObject
+import kotlinx.serialization.modules.SerializersModule
 
 @Serializable
 public class TGeoManager : TNamed() {
@@ -12,12 +13,7 @@ public class TGeoManager : TNamed() {
     public val fVolumes: TObjArray = TObjArray.empty
 
 
-    companion object {
-        public val rootJson: Json = Json {
-            encodeDefaults = true
-            ignoreUnknownKeys = true
-            classDiscriminator = "_typename"
-        }
+    public companion object {
 
 
         /**
@@ -27,4 +23,41 @@ public class TGeoManager : TNamed() {
     }
 }
 
+@OptIn(ExperimentalSerializationApi::class)
+private class RootJsonSerialFormat : StringFormat {
 
+    override val serializersModule: SerializersModule get() = json.serializersModule
+
+    private val refCache: HashMap<UInt, TObject> = HashMap()
+
+    override fun <T> decodeFromString(deserializer: DeserializationStrategy<T>, string: String): T {
+        val match = refRegex.matchEntire(string)
+        return if (match != null) {
+            //Do unref
+            val ref = match.value.toUIntOrNull() ?: error("Ref value is not a number")
+            val refValue = refCache[ref] ?: error("Reference $ref unresolved")
+            refValue as T //TODO research means to make it safe
+        } else {
+            val res = json.decodeFromString(deserializer, string)
+            val uid = (res as? TObject)?.fUniqueID
+            if (uid != null && refCache[uid] == null) {
+                refCache[uid] = res
+            }
+            res
+        }
+    }
+
+    override fun <T> encodeToString(serializer: SerializationStrategy<T>, value: T): String =
+        json.encodeToString(serializer, value)
+
+    companion object {
+        val refRegex = """\{\s*"${"\\$"}ref"\s*:\s*(\d*)}""".toRegex()
+
+        val json: Json = Json {
+            encodeDefaults = true
+            ignoreUnknownKeys = true
+            classDiscriminator = "_typename"
+        }
+    }
+
+}