added ScriptNode for scripts, updated minimum version to 0.6.3

BasicNodes/ScriptNode.cs

@@ -0,0 +1,63 @@
+using BasicNodes;
+using FileFlows.Plugin;
+using System.Dynamic;
+
+namespace FileFlows.BasicNodes;
+
+/// <summary>
+/// A special node that is not shown in the UI and only created
+/// by the Flow Runner to execute a script.
+/// This Node exists in this plugin to make use of the Javascript executor
+/// </summary>
+public class ScriptNode:Node
+{
+    /// <summary>
+    /// Gets the number of inputs of this node
+    /// </summary>
+    public override int Inputs => 1;
+
+    /// <summary>
+    /// Gets or sets the model to pass to the node
+    /// </summary>
+    public ExpandoObject Model { get; set; }
+
+    /// <summary>
+    /// Gets or sets the code to execute
+    /// </summary>
+    public string Code { get; set; }
+
+
+    /// <summary>
+    /// Executes the script node
+    /// </summary>
+    /// <param name="args">the NodeParameters passed into this from the flow runner</param>
+    /// <returns>the output node to call next</returns>
+    public override int Execute(NodeParameters args)
+    {
+        // will throw exception if invalid
+        var script = new ScriptParser().Parse("ScriptNode", Code);
+
+        // build up the entry point
+        string epParams = string.Join(", ", script.Parameters?.Select(x => x.Name).ToArray());
+        // all scripts must contain the "Script" method we then add this to call that 
+        string entryPoint = $"Script({epParams});";
+
+        var execArgs = new JavascriptExecutionArgs
+        {
+            Args = args,
+            Code = Code + "\n\n" + entryPoint
+        };
+
+        if (script.Parameters?.Any() == true)
+        {
+            var dictModel = Model as IDictionary<string, object>;
+            foreach (var p in script.Parameters) 
+            {
+                var value = dictModel?.ContainsKey(p.Name) == true ? dictModel[p.Name] : null;
+                execArgs.AdditionalArguments.Add(p.Name, value);
+            }
+        }
+
+        return JavascriptExecutor.Execute(execArgs);
+    }
+}