FF-1698: C# scripts!

BasicNodes/Scripting/ScriptBase.cs

@@ -0,0 +1,70 @@
+using System.ComponentModel;
+using FileFlows.Plugin;
+using FileFlows.Plugin.Attributes;
+
+namespace BasicNodes.Scripting;
+
+/// <summary>
+/// Base for a script
+/// </summary>
+public abstract class ScriptBase : Node
+{
+    /// <inheritdoc />
+    public override int Inputs => 1;
+    /// <inheritdoc />
+    public override FlowElementType Type => FlowElementType.Process;
+    /// <inheritdoc />
+    public override bool FailureNode => true;
+
+    /// <summary>
+    /// Gets or sets the number of outputs
+    /// </summary>
+    [DefaultValue(1)]
+    [NumberInt(1)]
+    public new int Outputs { get; set; }
+    
+    /// <summary>
+    /// Gets the language of this script
+    /// </summary>
+    protected abstract ScriptLanguage Language { get; }
+    
+    /// <summary>
+    /// Gets or sets the code of the script
+    /// </summary>
+    public virtual string Code { get; set; }
+    
+    /// <inheritdoc />
+    public override int Execute(NodeParameters args)
+    {
+        if (string.IsNullOrEmpty(Code))
+        {
+            args.FailureReason = $"No code specified in {Language} script";
+            args.Logger?.ELog(args.FailureReason);
+            return -1; // no code, flow cannot continue doesn't know what to do
+        }
+
+        var result = args.ScriptExecutor.Execute(new()
+        {
+            Args = args,
+            Code = Language is ScriptLanguage.CSharp or ScriptLanguage.JavaScript ? Code : args.ReplaceVariables(Code),
+            ScriptType = ScriptType.Flow,
+            Language = Language
+        });
+        
+        if (result.Failed(out var error))
+        {
+            args.FailureReason = error;
+            args.Logger?.ELog(error);
+            return -1;
+        }
+
+        if (result.Value > Outputs)
+        {
+            args.FailureReason = "Unexpected output: " + result.Value;
+            args.Logger?.ELog(args.FailureReason);
+            return -1;
+        }
+
+        return result.Value;
+    }
+}