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- using System;
- using System.Collections.Generic;
- using System.ComponentModel;
- using System.Linq;
- using System.Reflection;
- using System.Runtime.CompilerServices;
- using System.Threading.Tasks;
- using Microsoft.CodeAnalysis;
- using Microsoft.CodeAnalysis.CSharp.Scripting;
- using Microsoft.CodeAnalysis.CSharp.Scripting.Hosting;
- using Microsoft.CodeAnalysis.Scripting;
- using Microsoft.CodeAnalysis.Scripting.Hosting;
- using RoslynPad.Roslyn;
- namespace InABox.DynamicGrid
- {
- internal class DocumentViewModel : INotifyPropertyChanged
- {
- private readonly RoslynHost _host;
- private bool _isReadOnly;
- private string _result;
- public DocumentViewModel(RoslynHost host, DocumentViewModel previous)
- {
- _host = host;
- Previous = previous;
- }
- public DocumentId Id { get; private set; }
- public bool IsReadOnly
- {
- get => _isReadOnly;
- private set => SetProperty(ref _isReadOnly, value);
- }
- public DocumentViewModel Previous { get; }
- public DocumentViewModel LastGoodPrevious
- {
- get
- {
- var previous = Previous;
- while (previous != null && previous.HasError) previous = previous.Previous;
- return previous;
- }
- }
- public Script<object> Script { get; private set; }
- public string Text { get; set; }
- public bool HasError { get; private set; }
- public string Result
- {
- get => _result;
- private set => SetProperty(ref _result, value);
- }
- private static MethodInfo HasSubmissionResult { get; } =
- typeof(Compilation).GetMethod(nameof(HasSubmissionResult), BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
- private static PrintOptions PrintOptions { get; } = new() { MemberDisplayFormat = MemberDisplayFormat.SeparateLines };
- public event PropertyChangedEventHandler PropertyChanged;
- internal void Initialize(DocumentId id)
- {
- Id = id;
- }
- public async Task<bool> TrySubmit()
- {
- Result = null;
- Script = LastGoodPrevious?.Script.ContinueWith(Text) ??
- CSharpScript.Create(Text, ScriptOptions.Default
- .WithReferences(_host.DefaultReferences)
- .WithImports(_host.DefaultImports));
- var compilation = Script.GetCompilation();
- var hasResult = (bool)HasSubmissionResult.Invoke(compilation, null);
- var diagnostics = Script.Compile();
- if (diagnostics.Any(t => t.Severity == DiagnosticSeverity.Error))
- {
- Result = string.Join(Environment.NewLine, diagnostics.Select(FormatObject));
- return false;
- }
- IsReadOnly = true;
- await Execute(hasResult);
- return true;
- }
- private async Task Execute(bool hasResult)
- {
- try
- {
- var result = await Script.RunAsync();
- if (result.Exception != null)
- {
- HasError = true;
- Result = FormatException(result.Exception);
- }
- else
- {
- Result = hasResult ? FormatObject(result.ReturnValue) : null;
- }
- }
- catch (Exception ex)
- {
- HasError = true;
- Result = FormatException(ex);
- }
- }
- private static string FormatException(Exception ex)
- {
- return CSharpObjectFormatter.Instance.FormatException(ex);
- }
- private static string FormatObject(object o)
- {
- return CSharpObjectFormatter.Instance.FormatObject(o, PrintOptions);
- }
- protected bool SetProperty<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
- {
- if (!EqualityComparer<T>.Default.Equals(field, value))
- {
- field = value;
- // ReSharper disable once ExplicitCallerInfoArgument
- OnPropertyChanged(propertyName);
- return true;
- }
- return false;
- }
- protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
- {
- PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
- }
- }
- }
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