port from perforce

intromat/Intromat/Nodes/Code/PrintNode.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Reactive.Linq;
+using DynamicData;
+using Intromat.Model.Compiler;
+using Intromat.PersistentModel;
+using Intromat.ViewModels;
+using Intromat.ViewModels.Editors;
+using Intromat.ViewModels.Previews;
+using Intromat.Views;
+using NodeNetwork.Toolkit.ValueNode;
+using ReactiveUI;
+using Splat;
+
+namespace Intromat.Nodes.Code
+{
+    public class PrintNode : ExecutionNodeBase
+    {
+        static PrintNode()
+        {
+            Locator.CurrentMutable.Register(() => new CodeGenNodeView(), typeof(IViewFor<PrintNode>));
+        }
+
+        public PrintNode() : base(NodeType.Code)
+        {
+            Name = "Print";
+
+            Text = new CodeGenInputViewModel<ITypedExpression<string>>(EPortType.String)
+            {
+                Name = "Text",
+                Editor = TextEditor
+            };
+            Inputs.Add(Text);
+
+            FlowIn.Value = FlowOutChanged
+                .CombineLatest(Text.ValueChanged, (flowOutChanged, textValueChanged) => (FlowOutChanged: flowOutChanged, StringExpression: textValueChanged))
+                .Select(v => new FunctionCall
+                {
+                    FunctionName = "print",
+                    FlowOut = FlowOut.Value,
+                    Parameters = { v.StringExpression ?? new StringLiteralValue { Value = "" } }
+                });
+
+            var stringPreview = new StringPreviewViewModel();
+            Preview = stringPreview;
+
+            this.WhenAnyValue(vm => vm.Text.Value)
+                .Where(v => v != null)
+                .Subscribe(_ => stringPreview.Value = Text.Value.PreviewValue ?? string.Empty);
+        }
+
+        public StringExpressionEditorViewModel TextEditor { get; } = new();
+
+        public ValueNodeInputViewModel<ITypedExpression<string>> Text { get; }
+
+        public override NodeModelBase CreateModel()
+        {
+            return new PrintModel();
+        }
+
+        public override void SaveModel(NodeModelBase model)
+        {
+            base.SaveModel(model);
+            var print = (PrintModel)model;
+            print.Text = TextEditor.Value is StringLiteralValue text ? text.Value : null;
+        }
+
+        public override void LoadModel(NodeModelBase model)
+        {
+            base.LoadModel(model);
+            var print = (PrintModel)model;
+            if (print.Text != null)
+                TextEditor.Value = new StringLiteralValue { Value = print.Text };
+        }
+    }
+}