Added nodes related to the list and array operations

Examples/Nodify.Calculator/Execution/Handlers/NodeHandlers.cs

@@ -340,6 +340,108 @@ namespace Nodify.Calculator.Execution.Handlers
         }
     }
 
+    // ─────────────────────────────────────────────────────────────────────────────
+    // List operation execution handlers
+    // ─────────────────────────────────────────────────────────────────────────────
+
+    internal sealed class ListAddExecutionHandler : INodeExecutionHandler
+    {
+        public bool CanHandle(OperationViewModel node, ExecutionContext ctx)
+            => node is SystemOperationViewModel sys && sys.SystemOperationType == SystemOperations.LIST_ADD;
+
+        public void Execute(OperationViewModel node, ExecutionContext ctx)
+        {
+            var listJson = ListExecHelper.ReadInput(node, ctx, "List");
+            var itemJson = ListExecHelper.ReadInput(node, ctx, "Item");
+            var list = ListExecHelper.ParseList(listJson);
+            list.Add(itemJson != null ? JToken.Parse(itemJson) : JValue.CreateNull());
+            var result = list.ToString(Formatting.None);
+            ctx.Outputs[node.NodeId] = result;
+            ctx.Variables[node.NodeId] = result;
+            ctx.Log($"[List Add] Added item. Count={list.Count}");
+        }
+    }
+
+    internal sealed class ListRemoveExecutionHandler : INodeExecutionHandler
+    {
+        public bool CanHandle(OperationViewModel node, ExecutionContext ctx)
+            => node is SystemOperationViewModel sys && sys.SystemOperationType == SystemOperations.LIST_REMOVE;
+
+        public void Execute(OperationViewModel node, ExecutionContext ctx)
+        {
+            var listJson = ListExecHelper.ReadInput(node, ctx, "List");
+            var indexStr = ListExecHelper.ReadInput(node, ctx, "Index");
+            var list = ListExecHelper.ParseList(listJson);
+            int index = int.TryParse(indexStr, out var i) ? i : -1;
+            if (index >= 0 && index < list.Count)
+                list.RemoveAt(index);
+            else
+                ctx.Log($"[List Remove] Index {index} out of range (Count={list.Count})", logType.Warning);
+            var result = list.ToString(Formatting.None);
+            ctx.Outputs[node.NodeId] = result;
+            ctx.Variables[node.NodeId] = result;
+        }
+    }
+
+    internal sealed class ListUpdateExecutionHandler : INodeExecutionHandler
+    {
+        public bool CanHandle(OperationViewModel node, ExecutionContext ctx)
+            => node is SystemOperationViewModel sys && sys.SystemOperationType == SystemOperations.LIST_UPDATE;
+
+        public void Execute(OperationViewModel node, ExecutionContext ctx)
+        {
+            var listJson = ListExecHelper.ReadInput(node, ctx, "List");
+            var indexStr = ListExecHelper.ReadInput(node, ctx, "Index");
+            var itemJson = ListExecHelper.ReadInput(node, ctx, "Item");
+            var list = ListExecHelper.ParseList(listJson);
+            int index = int.TryParse(indexStr, out var i) ? i : -1;
+            if (index >= 0 && index < list.Count)
+                list[index] = itemJson != null ? JToken.Parse(itemJson) : JValue.CreateNull();
+            else
+                ctx.Log($"[List Update] Index {index} out of range (Count={list.Count})", logType.Warning);
+            var result = list.ToString(Formatting.None);
+            ctx.Outputs[node.NodeId] = result;
+            ctx.Variables[node.NodeId] = result;
+        }
+    }
+
+    internal sealed class ListClearExecutionHandler : INodeExecutionHandler
+    {
+        public bool CanHandle(OperationViewModel node, ExecutionContext ctx)
+            => node is SystemOperationViewModel sys && sys.SystemOperationType == SystemOperations.LIST_CLEAR;
+
+        public void Execute(OperationViewModel node, ExecutionContext ctx)
+        {
+            var result = "[]";
+            ctx.Outputs[node.NodeId] = result;
+            ctx.Variables[node.NodeId] = result;
+            ctx.Log("[List Clear] Cleared list");
+        }
+    }
+
+    /// <summary>Helper for reading list node inputs and parsing JSON arrays.</summary>
+    internal static class ListExecHelper
+    {
+        public static string ReadInput(OperationViewModel node, ExecutionContext ctx, string title)
+        {
+            var conn = ctx.Connections.FirstOrDefault(c =>
+                c.Input.Operation == node
+                && (c.Input.Title ?? "").StartsWith(title, StringComparison.OrdinalIgnoreCase)
+                && c.Input.Shape != ConnectorShape.Triangle);
+            if (conn == null) return null;
+            if (ctx.Outputs.TryGetValue(conn.OutputNodeId, out var val))
+                return val;
+            return null;
+        }
+
+        public static JArray ParseList(string json)
+        {
+            if (string.IsNullOrEmpty(json)) return new JArray();
+            try { return JArray.Parse(json); }
+            catch { return new JArray(); }
+        }
+    }
+
     // ─────────────────────────────────────────────────────────────────────────────
     // Default / fallback: API call
     // ─────────────────────────────────────────────────────────────────────────────

Examples/Nodify.Calculator/Execution/Resolvers/NodeValueResolvers.cs

@@ -205,4 +205,88 @@ namespace Nodify.Calculator.Execution.Resolvers
             return null;
         }
     }
+
+    // ─────────────────────────────────────────────────────────────────────────────
+    // LIST GET: pick an element by index from a JSON array (non-flow value node).
+    // ─────────────────────────────────────────────────────────────────────────────
+    internal sealed class ListGetValueResolver : INodeValueResolver
+    {
+        public bool CanResolve(OperationViewModel node, ConnectorViewModel c)
+            => node is SystemOperationViewModel sys && sys.SystemOperationType == SystemOperations.LIST_GET;
+
+        public string Resolve(OperationViewModel node, ConnectorViewModel outputConnector, IValueResolutionContext ctx)
+        {
+            var listInput = node.Input.FirstOrDefault(i => i.Shape == ConnectorShape.Grid);
+            var indexInput = node.Input.FirstOrDefault(i => (i.Title ?? "").StartsWith("Index", StringComparison.OrdinalIgnoreCase));
+            if (listInput == null) return null;
+
+            var json = ctx.Read(listInput);
+            var indexStr = indexInput != null ? ctx.Read(indexInput) : "0";
+            int index = int.TryParse(indexStr, out var i) ? i : 0;
+
+            try
+            {
+                var arr = JArray.Parse(json ?? "[]");
+                if (index >= 0 && index < arr.Count)
+                {
+                    var item = arr[index];
+                    return item.Type == JTokenType.String ? item.ToString() : item.ToString(Formatting.None);
+                }
+            }
+            catch { }
+            return null;
+        }
+    }
+
+    // ─────────────────────────────────────────────────────────────────────────────
+    // LIST COUNT: returns the length of a JSON array as a string integer.
+    // ─────────────────────────────────────────────────────────────────────────────
+    internal sealed class ListCountValueResolver : INodeValueResolver
+    {
+        public bool CanResolve(OperationViewModel node, ConnectorViewModel c)
+            => node is SystemOperationViewModel sys && sys.SystemOperationType == SystemOperations.LIST_COUNT;
+
+        public string Resolve(OperationViewModel node, ConnectorViewModel outputConnector, IValueResolutionContext ctx)
+        {
+            var listInput = node.Input.FirstOrDefault(i => i.Shape == ConnectorShape.Grid);
+            if (listInput == null) return "0";
+
+            var json = ctx.Read(listInput);
+            try
+            {
+                var arr = JArray.Parse(json ?? "[]");
+                return arr.Count.ToString();
+            }
+            catch { return "0"; }
+        }
+    }
+
+    // ─────────────────────────────────────────────────────────────────────────────
+    // LIST CONTAINS: checks if item exists in array, returns "true"/"false".
+    // ─────────────────────────────────────────────────────────────────────────────
+    internal sealed class ListContainsValueResolver : INodeValueResolver
+    {
+        public bool CanResolve(OperationViewModel node, ConnectorViewModel c)
+            => node is SystemOperationViewModel sys && sys.SystemOperationType == SystemOperations.LIST_CONTAINS;
+
+        public string Resolve(OperationViewModel node, ConnectorViewModel outputConnector, IValueResolutionContext ctx)
+        {
+            var listInput = node.Input.FirstOrDefault(i => i.Shape == ConnectorShape.Grid);
+            var itemInput = node.Input.FirstOrDefault(i => i.IsCopyConnector);
+            if (listInput == null) return "false";
+
+            var json = ctx.Read(listInput);
+            var itemJson = itemInput != null ? ctx.Read(itemInput) : null;
+
+            try
+            {
+                var arr = JArray.Parse(json ?? "[]");
+                if (string.IsNullOrEmpty(itemJson)) return "false";
+                var searchToken = JToken.Parse(itemJson);
+                bool found = arr.Any(t => JToken.DeepEquals(t, searchToken));
+                return found.ToString().ToLower();
+            }
+            catch { return "false"; }
+        }
+    }
 }