added Try extensions generator

Railway.SourceGenerator/ExtensionsMethodGenerator.cs

@@ -8,7 +8,7 @@ using Microsoft.CodeAnalysis;
 namespace Just.Railway.SourceGen;
 
 [Generator]
-public class ResultMethodGenerator : IIncrementalGenerator
+public class ExtensionsMethodGenerator : IIncrementalGenerator
 {
     private readonly IEnumerable<IGeneratorExecutor> _executors = new IGeneratorExecutor[]
     {
@@ -18,6 +18,7 @@ public class ResultMethodGenerator : IIncrementalGenerator
         new ResultBindExecutor(),
         new ResultTapExecutor(),
         new ResultAppendExecutor(),
+        new TryExtensionsExecutor(),
     };
 
     public void Initialize(IncrementalGeneratorInitializationContext context)

Railway.SourceGenerator/TryExtensionsExecutor.cs

@@ -0,0 +1,211 @@
+using System;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen;
+
+public sealed class TryExtensionsExecutor : IGeneratorExecutor
+{
+    public void Execute(SourceProductionContext context, Compilation source)
+    {
+        var methods = GenerateMethods();
+        var code = $$"""
+        #nullable enable
+        using System;
+        using System.Collections.Generic;
+        using System.Diagnostics.Contracts;
+        using System.CodeDom.Compiler;
+
+        namespace Just.Railway;
+
+        public static partial class Try
+        {
+        {{methods}}
+        }
+        """;
+
+        context.AddSource("Try.Run.g.cs", code);
+    }
+
+    private string GenerateMethods()
+    {
+        var sb = new StringBuilder();
+
+        for (int i = 0; i <= Constants.MaxResultTupleSize; i++)
+        {
+            GenerateMethodsForArgCount(sb, argCount: i);
+        }
+
+        return sb.ToString();
+    }
+
+    private void GenerateMethodsForArgCount(StringBuilder sb, int argCount)
+    {
+        var templateArgNames = Enumerable.Range(1, argCount)
+            .Select(i => $"T{i}")
+            .ToImmutableArray();
+        var argNames = Enumerable.Range(1, argCount)
+            .Select(i => $"arg{i}")
+            .ToImmutableArray();
+
+        string actionTemplateDecl = GenerateTemplateDecl(templateArgNames);
+        string resultActionTemplateDecl = GenerateTemplateDecl(templateArgNames.Add("Result"));
+        string funcTemplateDecl = GenerateTemplateDecl(templateArgNames.Add("TResult"));
+        string resultFuncTemplateDecl = GenerateTemplateDecl(templateArgNames.Add("Result<TResult>"));
+        string argumentsDeclExpansion = string.Join(", ", templateArgNames.Zip(argNames, (t, n) => $"{t} {n}"));
+        string argumentsExpansion = string.Join(", ", argNames);
+
+        sb.AppendLine($"#region <{string.Join(", ", templateArgNames)}>");
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(TryExtensionsExecutor)}}", "1.0.0.0")]
+        public static Result Run{{actionTemplateDecl}}(Action{{actionTemplateDecl}} action{{TrailingArguments(argumentsDeclExpansion)}})
+        {
+            try
+            {
+                action({{argumentsExpansion}});
+                return Result.Success();
+            }
+            catch (Exception ex)
+            {
+                return Error.New(ex);
+            }
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(TryExtensionsExecutor)}}", "1.0.0.0")]
+        public static Result Run{{actionTemplateDecl}}(Func{{resultActionTemplateDecl}} action{{TrailingArguments(argumentsDeclExpansion)}})
+        {
+            try
+            {
+                return action({{argumentsExpansion}});
+            }
+            catch (Exception ex)
+            {
+                return Error.New(ex);
+            }
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(TryExtensionsExecutor)}}", "1.0.0.0")]
+        public static Result<TResult> Run{{funcTemplateDecl}}(Func{{funcTemplateDecl}} func{{TrailingArguments(argumentsDeclExpansion)}})
+        {
+            try
+            {
+                return Result.Success(func({{argumentsExpansion}}));
+            }
+            catch (Exception ex)
+            {
+                return Error.New(ex);
+            }
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(TryExtensionsExecutor)}}", "1.0.0.0")]
+        public static Result<TResult> Run{{funcTemplateDecl}}(Func{{resultFuncTemplateDecl}} func{{TrailingArguments(argumentsDeclExpansion)}})
+        {
+            try
+            {
+                return func({{argumentsExpansion}});
+            }
+            catch (Exception ex)
+            {
+                return Error.New(ex);
+            }
+        }
+        """);
+
+        GenerateAsyncMethods(sb, templateArgNames, actionTemplateDecl, funcTemplateDecl, argumentsDeclExpansion, argumentsExpansion, "Task");
+        GenerateAsyncMethods(sb, templateArgNames, actionTemplateDecl, funcTemplateDecl, argumentsDeclExpansion, argumentsExpansion, "ValueTask");
+
+        sb.AppendLine("#endregion");
+    }
+
+    private static void GenerateAsyncMethods(StringBuilder sb, ImmutableArray<string> templateArgNames, string actionTemplateDecl, string funcTemplateDecl, string argumentsDeclExpansion, string argumentsExpansion, string taskType)
+    {
+        string actionTaskTemplateDecl = GenerateTemplateDecl(templateArgNames.Add(taskType));
+        string resultActionTaskTemplateDecl = GenerateTemplateDecl(templateArgNames.Add($"{taskType}<Result>"));
+        string funcTaskTemplateDecl = GenerateTemplateDecl(templateArgNames.Add($"{taskType}<TResult>"));
+        string resultFuncTaskTemplateDecl = GenerateTemplateDecl(templateArgNames.Add($"{taskType}<Result<TResult>>"));
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(TryExtensionsExecutor)}}", "1.0.0.0")]
+        public static async {{taskType}}<Result> Run{{actionTemplateDecl}}(Func{{actionTaskTemplateDecl}} action{{TrailingArguments(argumentsDeclExpansion)}})
+        {
+            try
+            {
+                await action({{argumentsExpansion}}).ConfigureAwait(false);
+                return Result.Success();
+            }
+            catch (Exception ex)
+            {
+                return Error.New(ex);
+            }
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(TryExtensionsExecutor)}}", "1.0.0.0")]
+        public static async {{taskType}}<Result> Run{{actionTemplateDecl}}(Func{{resultActionTaskTemplateDecl}} action{{TrailingArguments(argumentsDeclExpansion)}})
+        {
+            try
+            {
+                return await action({{argumentsExpansion}}).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                return Error.New(ex);
+            }
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(TryExtensionsExecutor)}}", "1.0.0.0")]
+        public static async {{taskType}}<Result<TResult>> Run{{funcTemplateDecl}}(Func{{funcTaskTemplateDecl}} func{{TrailingArguments(argumentsDeclExpansion)}})
+        {
+            try
+            {
+                return Result.Success(await func({{argumentsExpansion}}).ConfigureAwait(false));
+            }
+            catch (Exception ex)
+            {
+                return Error.New(ex);
+            }
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(TryExtensionsExecutor)}}", "1.0.0.0")]
+        public static async {{taskType}}<Result<TResult>> Run{{funcTemplateDecl}}(Func{{resultFuncTaskTemplateDecl}} func{{TrailingArguments(argumentsDeclExpansion)}})
+        {
+            try
+            {
+                return await func({{argumentsExpansion}}).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                return Error.New(ex);
+            }
+        }
+        """);
+    }
+
+    private static string TrailingArguments(string argumentsExpansion) => string.IsNullOrEmpty(argumentsExpansion)
+        ? string.Empty
+        : $", {argumentsExpansion}";
+    private static string GenerateTemplateDecl(ImmutableArray<string> templateArgNames) => templateArgNames.Length > 0
+        ? $"<{string.Join(", ", templateArgNames)}>"
+        : string.Empty;
+}