basic starscript support + a textbox that provides the starscript executed result & compiled script as well as suggestions

src/Ryujinx/Systems/Starscript/StarscriptTextBoxViewModel.cs

@@ -0,0 +1,123 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using Ryujinx.Ava.UI.ViewModels;
+using Starscript;
+using Starscript.Internal;
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Threading;
+
+namespace Ryujinx.Ava.Systems.Starscript
+{
+    public partial class StarscriptTextBoxViewModel : BaseModel
+    {
+        private readonly StarscriptHypervisor _hv;
+        
+        public StarscriptTextBoxViewModel(StarscriptHypervisor hv = null)
+        {
+            _hv = hv ?? RyujinxStarscript.Hypervisor;
+        }
+        
+        public ObservableCollection<string> CurrentSuggestions { get; } = [];
+
+        [ObservableProperty] private bool _hasError;
+        [ObservableProperty] private StringSegment _currentScriptResult;
+        [ObservableProperty] private string _errorMessage;
+        private Exception _exception;
+        private string _currentScriptSource;
+        private Script _currentScript;
+        
+        public Exception Exception
+        {
+            get => _exception;
+            set
+            {
+                ErrorMessage = (_exception = value) switch
+                {
+                    ParseException pe => pe.Error.ToString(),
+                    StarscriptException se => se.Message,
+                    _ => string.Empty
+                };
+                
+                OnPropertyChanged();
+            }
+        }
+        
+        public string CurrentScriptSource
+        {
+            get => _currentScriptSource;
+            set
+            {
+                _currentScriptSource = value;
+
+                if (value is null)
+                {
+                    CurrentScript = null;
+                    CurrentScriptResult = null;
+                    Exception = null;
+                    HasError = false;
+                    return;
+                }
+
+                try
+                {
+                    CurrentScript = Compiler.DirectCompile(CurrentScriptSource);
+                    Exception = null;
+                    HasError = false;
+                }
+                catch (ParseException pe)
+                {
+                    CurrentScript = null;
+                    CurrentScriptResult = null;
+                    Exception = pe;
+                    HasError = true;
+                }
+
+                OnPropertyChanged();
+            }
+        }
+
+        public Script CurrentScript
+        {
+            get => _currentScript;
+            private set
+            {
+                try
+                {
+                    CurrentScriptResult = value?.Execute(_hv)!;
+                    _currentScript = value;
+                    Exception = null;
+                    HasError = false;
+                }
+                catch (StarscriptException se)
+                {
+                    _currentScript = null;
+                    CurrentScriptResult = null;
+                    Exception = se;
+                    HasError = true;
+                }
+
+                OnPropertyChanged();
+            }
+        }
+
+        public IEnumerable<object> GetSuggestions(string input, CancellationToken token)
+        {
+            CurrentScriptSource = input;
+            
+            _hv.GetCompletions(CurrentScriptSource, CurrentScriptSource.Length, CreateCallback(), token);
+            
+            OnPropertyChanged(nameof(CurrentSuggestions));
+
+            return CurrentSuggestions;
+        }
+
+        private CompletionCallback CreateCallback()
+        {
+            CurrentSuggestions.Clear();
+            
+            return (result, isFunction) => 
+                CurrentSuggestions.Add(isFunction ? $"{result}(" : result);
+        }
+    }
+}