refactor and print source to be compiled

Author: gregsdennis

Diff for: LearnJsonEverything/Services/CompilationHelpers.cs

@@ -1,12 +1,15 @@
 using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp;
+using System.Reflection;
+using static LearnJsonEverything.Services.Iconography;
 
 namespace LearnJsonEverything.Services;
 
 public static class CompilationHelpers
 {
 	private static MetadataReference[]? _references;
 
-	private static readonly string[] _ensuredAssemblies =
+	private static readonly string[] EnsuredAssemblies =
 	[
 		"Json.More",
 		"JsonPointer.Net",
@@ -22,7 +25,7 @@ public static async Task<MetadataReference[]> LoadAssemblyReferences(HttpClient
 			var names = refs
 				.Where(x => !x.IsDynamic)
 				.Select(x => x.FullName!.Split(',')[0])
-				.Concat(_ensuredAssemblies)
+				.Concat(EnsuredAssemblies)
 				.OrderBy(x => x)
 				.ToArray();
 
@@ -50,4 +53,57 @@ public static async Task<MetadataReference[]> LoadAssemblyReferences(HttpClient
 
 		return _references;
 	}
+
+	public static (ILessonRunner<T>?, string[]) GetRunner<T>(LessonData lesson, string userCode)
+	{
+		if (_references is null)
+			throw new Exception("Compilation assemblies not loaded.");
+
+		var fullSource = lesson.ContextCode
+			.Replace("/* USER CODE */", userCode);
+
+		Console.WriteLine($"Compiling...\n\n{fullSource}");
+
+		var syntaxTree = CSharpSyntaxTree.ParseText(fullSource);
+		var assemblyPath = Path.ChangeExtension(Path.GetTempFileName(), "dll");
+
+		var compilation = CSharpCompilation.Create(Path.GetFileName(assemblyPath))
+			.WithOptions(new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary))
+			.AddReferences(_references)
+			.AddSyntaxTrees(syntaxTree);
+
+		using var dllStream = new MemoryStream();
+		using var pdbStream = new MemoryStream();
+		using var xmlStream = new MemoryStream();
+		var emitResult = compilation.Emit(dllStream, pdbStream, xmlStream);
+		if (!emitResult.Success)
+		{
+			var diagnostics = new List<string>();
+			foreach (var diagnostic in emitResult.Diagnostics)
+			{
+				var icon = diagnostic.Severity switch
+				{
+					DiagnosticSeverity.Info => MessageIcon,
+					DiagnosticSeverity.Warning => WarnIcon,
+					DiagnosticSeverity.Error => ErrorIcon,
+					_ => string.Empty
+				};
+				diagnostics.Add($"{icon} {diagnostic.GetMessage()}");
+			}
+			return (null, [.. diagnostics]);
+		}
+
+#pragma warning disable IL2026
+#pragma warning disable IL2072
+#pragma warning disable IL2070
+		var assembly = Assembly.Load(dllStream.ToArray());
+
+		var type = assembly.DefinedTypes.Single(x => !x.IsInterface && x.ImplementedInterfaces.Contains(typeof(ILessonRunner<T>)));
+		var runner = (ILessonRunner<T>)Activator.CreateInstance(type)!;
+#pragma warning restore IL2070
+#pragma warning restore IL2072
+#pragma warning restore IL2026
+
+		return (runner, []);
+	}
 }

Diff for: LearnJsonEverything/Services/Iconography.cs

@@ -0,0 +1,9 @@
+namespace LearnJsonEverything.Services;
+
+public static class Iconography
+{
+	public const string SuccessIcon = "✔";
+	public const string ErrorIcon = "❌";
+	public const string WarnIcon = "⚠";
+	public const string MessageIcon = "ⓘ";
+}

Diff for: LearnJsonEverything/Services/Runners/SchemaRunner.cs

@@ -36,11 +36,6 @@ public class SchemaTest
 		 
 		 """;
 
-	private const string SuccessIcon = "✔";
-	private const string ErrorIcon = "❌";
-	private const string WarnIcon = "⚠";
-	private const string MessageIcon = "ⓘ";
-
 	public static string BuildInstructions(LessonData lesson) => Instructions
 		.Replace("/* TITLE */", lesson.Title)
 		.Replace("/* INSTRUCTIONS */", lesson.Instructions)
@@ -61,52 +56,19 @@ .. tests.Select(test => $"|`{test.Instance.AsJsonString()}`|{test.IsValid}|")
 	}
 
 	[RequiresUnreferencedCode("")]
-	public static string[] Run(string userCode, LessonData lesson, MetadataReference[] references)
+	public static string[] Run(string userCode, LessonData lesson)
 	{
-		var fullSource = lesson.ContextCode
-			.Replace("/* USER CODE */", userCode);
-
-		var syntaxTree = CSharpSyntaxTree.ParseText(fullSource);
-		var assemblyPath = Path.ChangeExtension(Path.GetTempFileName(), "dll");
-
-		var compilation = CSharpCompilation.Create(Path.GetFileName(assemblyPath))
-			.WithOptions(new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary))
-			.AddReferences(references)
-			.AddSyntaxTrees(syntaxTree);
-
-		using var dllStream = new MemoryStream();
-		using var pdbStream = new MemoryStream();
-		using var xmlStream = new MemoryStream();
-		var emitResult = compilation.Emit(dllStream, pdbStream, xmlStream);
-		if (!emitResult.Success)
-		{
-			var diagnostics = new List<string>();
-			foreach (var diagnostic in emitResult.Diagnostics)
-			{
-				var icon = diagnostic.Severity switch
-				{
-					DiagnosticSeverity.Info => MessageIcon,
-					DiagnosticSeverity.Warning => WarnIcon,
-					DiagnosticSeverity.Error => ErrorIcon,
-					_ => string.Empty
-				};
-				diagnostics.Add($"{icon} {diagnostic.GetMessage()}");
-			}
-			return [.. diagnostics];
-		}
-
-		var assembly = Assembly.Load(dllStream.ToArray());
+		var (runner, errors) = CompilationHelpers.GetRunner<EvaluationResults>(lesson, userCode);
 
-		var type = assembly.DefinedTypes.Single(x => !x.IsInterface && x.ImplementedInterfaces.Contains(typeof(ILessonRunner<EvaluationResults>)));
-		var runner = (ILessonRunner<EvaluationResults>) Activator.CreateInstance(type)!;
+		if (runner is null) return errors;
 
 		var tests = lesson.Tests.Deserialize(SerializerContext.Default.SchemaTestArray)!;
 		var results = new List<string>();
 
 		foreach (var test in tests)
 		{
 			var result = runner.Run(new JsonObject { ["instance"] = test.Instance });
-			results.Add($"{(test.IsValid == result.IsValid ? SuccessIcon : ErrorIcon)} {test.Instance.AsJsonString()}");
+			results.Add($"{(test.IsValid == result.IsValid ? Iconography.SuccessIcon : Iconography.ErrorIcon)} {test.Instance.AsJsonString()}");
 		}
 
 		// run the code

Diff for: LearnJsonEverything/Shared/Teacher.razor

@@ -70,7 +70,7 @@
 			var userCode = await _codeEditor.GetValue();
 
 			await _outputEditor.SetValue("");
-			var results = SchemaRunner.Run(userCode, _currentLesson!, await CompilationHelpers.LoadAssemblyReferences(Client));
+			var results = SchemaRunner.Run(userCode, _currentLesson!);
 			await _outputEditor.SetValue(string.Join(Environment.NewLine, results!));
 		}
 		catch (Exception e)