added Tap extensions generator

.gitea/workflows/publish-nuget.yaml

@@ -24,9 +24,6 @@ jobs:
     - name: Setup nuget source
       run: dotnet nuget add source --name gitea_registry https://gitea.jstdev.ru/api/packages/just/nuget/index.json
 
-    - name: Parsing release tag
-      run: echo ${{ gitea.ref_name }} | sed -E 's|^(v([0-9]+(\.[0-9]+){2}))(-([a-z0-9]+)){1}|/p:ReleaseVersion=\2 /p:VersionSuffix=\5|; s|^(v([0-9]+(\.[0-9]+){2}))$|/p:ReleaseVersion=\2|'
-
     - name: Create the package
       env:
         RELEASE_VERSION: ${{ gitea.ref_name }}

JustDotNet.Railway.sln

@@ -7,6 +7,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Railway", "Railway\Railway.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Raliway.Tests", "Raliway.Tests\Raliway.Tests.csproj", "{607F91E4-83A2-48C4-BAC2-2205BEE81D93}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Railway.SourceGenerator", "Railway.SourceGenerator\Railway.SourceGenerator.csproj", "{1A3B8F0A-7A30-4AA8-BC15-47FA2D75B6BF}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -24,5 +26,9 @@ Global
 		{607F91E4-83A2-48C4-BAC2-2205BEE81D93}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{607F91E4-83A2-48C4-BAC2-2205BEE81D93}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{607F91E4-83A2-48C4-BAC2-2205BEE81D93}.Release|Any CPU.Build.0 = Release|Any CPU
+		{1A3B8F0A-7A30-4AA8-BC15-47FA2D75B6BF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{1A3B8F0A-7A30-4AA8-BC15-47FA2D75B6BF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{1A3B8F0A-7A30-4AA8-BC15-47FA2D75B6BF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{1A3B8F0A-7A30-4AA8-BC15-47FA2D75B6BF}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal

Railway.SourceGenerator/Constants.cs

@@ -0,0 +1,7 @@
+namespace Just.Railway.SourceGen;
+
+internal static class Constants
+{
+    public const int MaxResultTupleSize = 4;
+    
+}

Railway.SourceGenerator/IGeneratorExecutor.cs

@@ -0,0 +1,9 @@
+using System;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen;
+
+internal interface IGeneratorExecutor
+{
+    public abstract void Execute(SourceProductionContext context, Compilation source);
+}

Railway.SourceGenerator/Railway.SourceGenerator.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <IsPackable>false</IsPackable>
+    <RootNamespace>Just.Railway.SourceGen</RootNamespace>
+    
+    <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
+  </ItemGroup>
+
+</Project>

Railway.SourceGenerator/ResultBindExecutor.cs

@@ -0,0 +1,84 @@
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen;
+
+internal sealed class ResultBindExecutor : ResultExtensionsExecutor
+{
+    protected override string ExtensionType => "Bind";
+
+    protected override void GenerateMethodsForArgCount(StringBuilder sb, int argCount)
+    {
+        var templateArgNames = Enumerable.Range(1, argCount)
+            .Select(i => $"T{i}")
+            .ToImmutableArray();
+        string separatedTemplateArgs = string.Join(", ", templateArgNames);
+
+        sb.AppendLine($"#region <{separatedTemplateArgs}>");
+
+        string resultValueType = templateArgNames.Length == 1 ? separatedTemplateArgs : $"({separatedTemplateArgs})";
+        string resultValueExpansion = GenerateResultValueExpansion(templateArgNames);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
+        public static Result<R> Bind<{{separatedTemplateArgs}}, R>(this in Result<{{resultValueType}}> result, Func<{{separatedTemplateArgs}}, Result<R>> binding)
+        {
+            return result.State switch
+            {
+                ResultState.Success => binding({{resultValueExpansion}}),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(result))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
+        public static Task<Result<R>> Bind<{{separatedTemplateArgs}}, R>(this in Result<{{resultValueType}}> result, Func<{{separatedTemplateArgs}}, Task<Result<R>>> binding)
+        {
+            return result.State switch
+            {
+                ResultState.Success => binding({{resultValueExpansion}}),
+                ResultState.Error => Task.FromResult<Result<R>>(result.Error!),
+                _ => throw new ResultNotInitializedException(nameof(result))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
+        public static async Task<Result<R>> Bind<{{separatedTemplateArgs}}, R>(this Task<Result<{{resultValueType}}>> resultTask, Func<{{separatedTemplateArgs}}, Result<R>> binding)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            return result.State switch
+            {
+                ResultState.Success => binding({{resultValueExpansion}}),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(resultTask))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
+        public static async Task<Result<R>> Bind<{{separatedTemplateArgs}}, R>(this Task<Result<{{resultValueType}}>> resultTask, Func<{{separatedTemplateArgs}}, Task<Result<R>>> binding)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            return result.State switch
+            {
+                ResultState.Success => await binding({{resultValueExpansion}}).ConfigureAwait(false),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(resultTask))
+            };
+        }
+        """);
+
+        sb.AppendLine("#endregion");
+    }
+}

Railway.SourceGenerator/ResultCombineExecutor.cs

@@ -0,0 +1,204 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen;
+
+internal sealed class ResultCombineExecutor : IGeneratorExecutor
+{
+    public void Execute(SourceProductionContext context, Compilation source)
+    {
+        var methods = GenerateCombineMethods();
+        var code = $$"""
+        #nullable enable
+        using System;
+        using System.Collections.Generic;
+        using System.Diagnostics.Contracts;
+        using System.CodeDom.Compiler;
+
+        namespace Just.Railway;
+
+        public readonly partial struct Result
+        {
+        {{methods}}
+        }
+        """;
+
+        context.AddSource("Result.Combine.g.cs", code);
+    }
+
+
+    private string GenerateCombineMethods()
+    {
+        var sb = new StringBuilder();
+
+        for (int i = 2; i <= Constants.MaxResultTupleSize; i++)
+        {
+            GenerateCombineMethodsForArgCount(sb, argCount: i);
+        }
+
+        return sb.ToString();
+    }
+
+    private void GenerateCombineMethodsForArgCount(StringBuilder sb, int argCount)
+    {
+        sb.AppendLine($"#region Combine {argCount} Results");
+
+        GenerateGetBottomMethod(sb, argCount);
+
+        var argsResultTupleSizes = new List<ImmutableArray<int>>();
+        Span<int> templateCounts = stackalloc int[argCount];
+
+        Permute(templateCounts, argsResultTupleSizes);
+
+        foreach (var argResultTupleSizes in argsResultTupleSizes)
+        {
+            sb.AppendLine(GenerateCombineMethodBody(argResultTupleSizes));
+        }
+
+        sb.AppendLine("#endregion");
+
+        static void Permute(Span<int> templateCounts, ICollection<ImmutableArray<int>> argsResultTupleSizes, int lvl = 0)
+        {
+            int sum = 0;
+            for (int i = 0; i < lvl; i++)
+            {
+                sum += templateCounts[i];
+            }
+            for (templateCounts[lvl] = 0; templateCounts[lvl] <= Constants.MaxResultTupleSize - sum; templateCounts[lvl]++)
+            {
+                if (lvl == templateCounts.Length - 1)
+                {
+                    argsResultTupleSizes.Add(templateCounts.ToImmutableArray());
+                    continue;
+                }
+                Permute(templateCounts, argsResultTupleSizes, lvl + 1);
+            }
+        }
+    }
+
+    private static void GenerateGetBottomMethod(StringBuilder sb, int argCount)
+    {
+        var args = Enumerable.Range(1, argCount)
+            .Select(i => $"result{i}")
+            .ToImmutableArray();
+        var argsDecl = string.Join(", ", args.Select(x => $"ResultState {x}"));
+        sb.AppendLine($"[GeneratedCodeAttribute(\"{nameof(ResultCombineExecutor)}\", \"1.0.0.0\")]");
+        sb.AppendLine($"private static IEnumerable<string> GetBottom({argsDecl})");
+        sb.AppendLine("{");
+        foreach (var arg in args)
+        {
+            sb.AppendLine($"    if ({arg} == ResultState.Bottom) yield return \"{arg}\";");
+        }
+        sb.AppendLine("}");
+    }
+
+    private string GenerateCombineMethodBody(ImmutableArray<int> argResultTupleSizes)
+    {
+        var resultTupleSize = argResultTupleSizes.Sum();
+
+        var paramNames = Enumerable.Range(1, argResultTupleSizes.Length)
+            .Select(i => $"result{i}")
+            .ToImmutableArray();
+        var templateArgNames = Enumerable.Range(1, resultTupleSize)
+            .Select(i => $"T{i}")
+            .ToImmutableArray();
+
+        string templateDecl = templateArgNames.IsEmpty 
+            ? string.Empty
+            : $"<{string.Join(", ", templateArgNames)}>";
+        string resultTypeDecl = GetResultTypeDecl(templateArgNames);
+        string paramDecl;
+        {
+            var paramDeclBuilder = new StringBuilder();
+            int currentTemplateArg = 0;
+            for (int i = 0; i < argResultTupleSizes.Length; i++)
+            {
+                var argResultTupleSize = argResultTupleSizes[i];
+                string currentParamType = GetResultTypeDecl(templateArgNames.Slice(currentTemplateArg, argResultTupleSize));
+                currentTemplateArg += argResultTupleSize;
+                paramDeclBuilder.Append($"in {currentParamType} {paramNames[i]}, ");
+            }
+            paramDeclBuilder.Remove(paramDeclBuilder.Length-2, 2);
+            paramDecl = paramDeclBuilder.ToString();
+        }
+
+        var paramNameStates = paramNames.Select(x => $"{x}.State")
+            .ToImmutableArray();
+        string bottomStateCheck = string.Join(" & ", paramNameStates);
+        string statesSeparatedList = string.Join(", ", paramNameStates);
+
+        string failureChecks;
+        {
+            var failureChecksBuilder = new StringBuilder();
+            foreach (var paramName in paramNames)
+            {
+                failureChecksBuilder.AppendLine($"    if ({paramName}.IsFailure) error += {paramName}.Error;");
+            }
+            failureChecks = failureChecksBuilder.ToString();
+        }
+        string resultExpansion;
+        switch (resultTupleSize)
+        {
+            case 0:
+            resultExpansion = "null";
+            break;
+
+            case 1:
+            resultExpansion = $"{paramNames[argResultTupleSizes.IndexOf(1)]}.Value";
+            break;
+            
+            default:
+            var resultExpansionBuilder = new StringBuilder();
+            resultExpansionBuilder.Append("(");
+            for (int i = 0; i < argResultTupleSizes.Length; i++)
+            {
+                if (argResultTupleSizes[i] == 0) continue;
+                if (argResultTupleSizes[i] == 1)
+                {
+                    resultExpansionBuilder.Append($"{paramNames[i]}.Value, ");
+                    continue;
+                }
+                
+                for (int valueIndex = 1; valueIndex <= argResultTupleSizes[i]; valueIndex++)
+                {
+                    resultExpansionBuilder.Append($"{paramNames[i]}.Value.Item{valueIndex}, ");
+                }
+            }
+            resultExpansionBuilder.Remove(resultExpansionBuilder.Length - 2, 2);
+            resultExpansionBuilder.Append(")");
+            resultExpansion = resultExpansionBuilder.ToString();
+            break;
+        }
+        
+        string returnExpr = $"return error is null ? new({resultExpansion}) : new(error);";
+        var method = $$"""
+        [GeneratedCodeAttribute("{{nameof(ResultCombineExecutor)}}", "1.0.0.0")]
+        [PureAttribute]
+        public static {{resultTypeDecl}} Combine{{templateDecl}}({{paramDecl}})
+        {
+            if (({{bottomStateCheck}}) == ResultState.Bottom)
+            {
+                throw new ResultNotInitializedException(string.Join(';', GetBottom({{statesSeparatedList}})));
+            }
+            Error? error = null;
+        {{failureChecks}}
+            {{returnExpr}}
+        }
+        """;
+        return method;
+
+        static string GetResultTypeDecl(IReadOnlyList<string> templateArgNames)
+        {
+            return templateArgNames.Count switch
+            {
+                0 => "Result",
+                1 => $"Result<{templateArgNames[0]}>",
+                _ => $"Result<({string.Join(", ", templateArgNames)})>"
+            };
+        }
+    }
+}

Railway.SourceGenerator/ResultExtensionsExecutor.cs

@@ -0,0 +1,65 @@
+using System.Collections.Immutable;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen;
+
+internal abstract class ResultExtensionsExecutor : 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 ResultExtensions
+        {
+        {{methods}}
+        }
+        """;
+
+        context.AddSource($"ResultExtensions.{ExtensionType}.g.cs", code);
+    }
+
+    private string GenerateMethods()
+    {
+        var sb = new StringBuilder();
+
+        for (int i = 1; i <= Constants.MaxResultTupleSize; i++)
+        {
+            GenerateMethodsForArgCount(sb, argCount: i);
+        }
+
+        return sb.ToString();
+    }
+
+    protected string GenerateResultValueExpansion(ImmutableArray<string> templateArgNames)
+    {
+        string resultExpansion;
+        if (templateArgNames.Length > 1)
+        {
+            var resultExpansionBuilder = new StringBuilder();
+            for (int i = 1; i <= templateArgNames.Length; i++)
+            {
+                resultExpansionBuilder.Append($"result.Value.Item{i}, ");
+            }
+            resultExpansionBuilder.Remove(resultExpansionBuilder.Length - 2, 2);
+            resultExpansion = resultExpansionBuilder.ToString();
+        }
+        else
+        {
+            resultExpansion = "result.Value";
+        }
+
+        return resultExpansion;
+    }
+
+    protected abstract string ExtensionType { get; }
+    protected abstract void GenerateMethodsForArgCount(StringBuilder sb, int argCount);
+}

Railway.SourceGenerator/ResultMapExecutor.cs

@@ -0,0 +1,83 @@
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen;
+
+internal sealed class ResultMapExecutor : ResultExtensionsExecutor
+{
+    protected override string ExtensionType => "Map";
+    protected override void GenerateMethodsForArgCount(StringBuilder sb, int argCount)
+    {
+        var templateArgNames = Enumerable.Range(1, argCount)
+            .Select(i => $"T{i}")
+            .ToImmutableArray();
+        string separatedTemplateArgs = string.Join(", ", templateArgNames);
+
+        sb.AppendLine($"#region <{separatedTemplateArgs}>");
+
+        string resultValueType = templateArgNames.Length == 1 ? separatedTemplateArgs : $"({separatedTemplateArgs})";
+        string resultValueExpansion = GenerateResultValueExpansion(templateArgNames);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMapExecutor)}}", "1.0.0.0")]
+        public static Result<R> Map<{{separatedTemplateArgs}}, R>(this in Result<{{resultValueType}}> result, Func<{{separatedTemplateArgs}}, R> mapping)
+        {
+            return result.State switch
+            {
+                ResultState.Success => mapping({{resultValueExpansion}}),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(result))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMapExecutor)}}", "1.0.0.0")]
+        public static async Task<Result<R>> Map<{{separatedTemplateArgs}}, R>(this Result<{{resultValueType}}> result, Func<{{separatedTemplateArgs}}, Task<R>> mapping)
+        {
+            return result.State switch
+            {
+                ResultState.Success => await mapping({{resultValueExpansion}}).ConfigureAwait(false),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(result))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMapExecutor)}}", "1.0.0.0")]
+        public static async Task<Result<R>> Map<{{separatedTemplateArgs}}, R>(this Task<Result<{{resultValueType}}>> resultTask, Func<{{separatedTemplateArgs}}, R> mapping)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            return result.State switch
+            {
+                ResultState.Success => mapping({{resultValueExpansion}}),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(resultTask))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMapExecutor)}}", "1.0.0.0")]
+        public static async Task<Result<R>> Map<{{separatedTemplateArgs}}, R>(this Task<Result<{{resultValueType}}>> resultTask, Func<{{separatedTemplateArgs}}, Task<R>> mapping)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            return result.State switch
+            {
+                ResultState.Success => await mapping({{resultValueExpansion}}).ConfigureAwait(false),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(resultTask))
+            };
+        }
+        """);
+
+        sb.AppendLine("#endregion");
+    }
+}

Railway.SourceGenerator/ResultMatchExecutor.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen;
+
+internal sealed class ResultMatchExecutor : ResultExtensionsExecutor
+{
+    protected override string ExtensionType => "Match";
+
+    protected override void GenerateMethodsForArgCount(StringBuilder sb, int argCount)
+    {
+        var templateArgNames = Enumerable.Range(1, argCount)
+            .Select(i => $"T{i}")
+            .ToImmutableArray();
+        string separatedTemplateArgs = string.Join(", ", templateArgNames);
+
+        sb.AppendLine($"#region <{separatedTemplateArgs}>");
+
+        string resultValueType = templateArgNames.Length == 1 ? separatedTemplateArgs : $"({separatedTemplateArgs})";
+        string resultValueExpansion = GenerateResultValueExpansion(templateArgNames);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMatchExecutor)}}", "1.0.0.0")]
+        public static R Match<{{separatedTemplateArgs}}, R>(this in Result<{{resultValueType}}> result, Func<{{separatedTemplateArgs}}, R> onSuccess, Func<Error, R> onFailure)
+        {
+            return result.State switch
+            {
+                ResultState.Success => onSuccess({{resultValueExpansion}}),
+                ResultState.Error => onFailure(result.Error!),
+                _ => throw new ResultNotInitializedException(nameof(result))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMatchExecutor)}}", "1.0.0.0")]
+        public static Task<R> Match<{{separatedTemplateArgs}}, R>(this in Result<{{resultValueType}}> result, Func<{{separatedTemplateArgs}}, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
+        {
+            return result.State switch
+            {
+                ResultState.Success => onSuccess({{resultValueExpansion}}),
+                ResultState.Error => onFailure(result.Error!),
+                _ => throw new ResultNotInitializedException(nameof(result))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMatchExecutor)}}", "1.0.0.0")]
+        public static async Task<R> Match<{{separatedTemplateArgs}}, R>(this Task<Result<{{resultValueType}}>> resultTask, Func<{{separatedTemplateArgs}}, R> onSuccess, Func<Error, R> onFailure)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            return result.State switch
+            {
+                ResultState.Success => onSuccess({{resultValueExpansion}}),
+                ResultState.Error => onFailure(result.Error!),
+                _ => throw new ResultNotInitializedException(nameof(resultTask))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMatchExecutor)}}", "1.0.0.0")]
+        public static async Task<R> Match<{{separatedTemplateArgs}}, R>(this Task<Result<{{resultValueType}}>> resultTask, Func<{{separatedTemplateArgs}}, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            var matchTask = result.State switch
+            {
+                ResultState.Success => onSuccess({{resultValueExpansion}}),
+                ResultState.Error => onFailure(result.Error!),
+                _ => throw new ResultNotInitializedException(nameof(resultTask))
+            };
+            return await matchTask.ConfigureAwait(false);
+        }
+        """);
+
+        sb.AppendLine("#endregion");
+    }
+}

Railway.SourceGenerator/ResultMethodGenerator.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen;
+
+[Generator]
+public class ResultMethodGenerator : IIncrementalGenerator
+{
+    private readonly IEnumerable<IGeneratorExecutor> _executors = new IGeneratorExecutor[]
+    {
+        new ResultCombineExecutor(),
+        new ResultMatchExecutor(),
+        new ResultMapExecutor(),
+        new ResultBindExecutor(),
+        new ResultTapExecutor(),
+    };
+
+    public void Initialize(IncrementalGeneratorInitializationContext context)
+    {
+        foreach (var executor in _executors)
+        {
+            context.RegisterSourceOutput(context.CompilationProvider, executor.Execute);
+        }
+    }
+}

Railway.SourceGenerator/ResultTapExecutor.cs

@@ -0,0 +1,112 @@
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen;
+
+internal sealed class ResultTapExecutor : ResultExtensionsExecutor
+{
+    protected override string ExtensionType => "Tap";
+
+    protected override void GenerateMethodsForArgCount(StringBuilder sb, int argCount)
+    {
+        var templateArgNames = Enumerable.Range(1, argCount)
+            .Select(i => $"T{i}")
+            .ToImmutableArray();
+        string separatedTemplateArgs = string.Join(", ", templateArgNames);
+
+        sb.AppendLine($"#region <{separatedTemplateArgs}>");
+
+        string resultValueType = templateArgNames.Length == 1 ? separatedTemplateArgs : $"({separatedTemplateArgs})";
+        string resultValueExpansion = GenerateResultValueExpansion(templateArgNames);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultTapExecutor)}}", "1.0.0.0")]
+        public static ref readonly Result<{{resultValueType}}> Tap<{{separatedTemplateArgs}}>(this in Result<{{resultValueType}}> result, Action<{{separatedTemplateArgs}}>? onSuccess = null, Action<Error>? onFailure = null)
+        {
+            switch (result.State)
+            {
+                case ResultState.Success:
+                    onSuccess?.Invoke({{resultValueExpansion}});
+                    break;
+                case ResultState.Error:
+                    onFailure?.Invoke(result.Error!);
+                    break;
+
+                default: throw new ResultNotInitializedException(nameof(result));
+            }
+            return ref result;
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultTapExecutor)}}", "1.0.0.0")]
+        public static async Task<Result<{{resultValueType}}>> Tap<{{separatedTemplateArgs}}>(this Task<Result<{{resultValueType}}>> resultTask, Action<{{separatedTemplateArgs}}>? onSuccess = null, Action<Error>? onFailure = null)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            switch (result.State)
+            {
+                case ResultState.Success:
+                    onSuccess?.Invoke({{resultValueExpansion}});
+                    break;
+                case ResultState.Error:
+                    onFailure?.Invoke(result.Error!);
+                    break;
+
+                default: throw new ResultNotInitializedException(nameof(resultTask));
+            }
+            return result;
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultTapExecutor)}}", "1.0.0.0")]
+        public static async Task<Result<{{resultValueType}}>> Tap<{{separatedTemplateArgs}}>(this Result<{{resultValueType}}> result, Func<{{separatedTemplateArgs}}, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
+        {
+            switch (result.State)
+            {
+                case ResultState.Success:
+                    if (onSuccess is not null)
+                        await onSuccess.Invoke({{resultValueExpansion}}).ConfigureAwait(false);
+                    break;
+                case ResultState.Error:
+                    if (onFailure is not null)
+                        await onFailure.Invoke(result.Error!).ConfigureAwait(false);
+                    break;
+
+                default: throw new ResultNotInitializedException(nameof(result));
+            }
+            return result;
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultTapExecutor)}}", "1.0.0.0")]
+        public static async Task<Result<{{resultValueType}}>> Tap<{{separatedTemplateArgs}}>(this Task<Result<{{resultValueType}}>> resultTask, Func<{{separatedTemplateArgs}}, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
+        {
+            var result = await resultTask.ConfigureAwait(false);
+            switch (result.State)
+            {
+                case ResultState.Success:
+                    if (onSuccess is not null)
+                        await onSuccess.Invoke({{resultValueExpansion}}).ConfigureAwait(false);
+                    break;
+                case ResultState.Error:
+                    if (onFailure is not null)
+                        await onFailure.Invoke(result.Error!).ConfigureAwait(false);
+                    break;
+
+                default: throw new ResultNotInitializedException(nameof(resultTask));
+            }
+            return result;
+        }
+        """);
+
+        sb.AppendLine("#endregion");
+    }
+}

Railway/Railway.csproj

@@ -4,6 +4,7 @@
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
+    <EmitCompilerGeneratedFiles Condition="'$(Configuration)'=='Debug'">true</EmitCompilerGeneratedFiles>
 
     <AssemblyName>Just.Railway</AssemblyName>
     <RootNamespace>Just.Railway</RootNamespace>
@@ -18,5 +19,11 @@
   <ItemGroup>
     <InternalsVisibleTo Include="$(AssemblyName).Tests" />
   </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Railway.SourceGenerator\Railway.SourceGenerator.csproj"
+                      OutputItemType="Analyzer"
+                      ReferenceOutputAssembly="false" />
+  </ItemGroup>
   
 </Project>

Railway/ResultExtensions.cs

@@ -1,10 +1,9 @@
 namespace Just.Railway;
 
-public static class ResultExtensions
+public static partial class ResultExtensions
 {
-    #region Match
+    #region Match<>
 
-    #region <>
     [Pure]
     public static R Match<R>(this in Result result, Func<R> onSuccess, Func<Error, R> onFailure)
     {
@@ -52,211 +51,7 @@ public static class ResultExtensions
 
     #endregion
 
-    #region <T>
-    [Pure]
-    public static R Match<T, R>(this in Result<T> result, Func<T, R> onSuccess, Func<Error, R> onFailure)
-    {
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static Task<R> Match<T, R>(this in Result<T> result, Func<T, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
-    {
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<R> Match<T, R>(this Task<Result<T>> resultTask, Func<T, R> onSuccess, Func<Error, R> onFailure)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    [Pure]
-    public static async Task<R> Match<T, R>(this Task<Result<T>> resultTask, Func<T, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        var matchTask = result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-        return await matchTask.ConfigureAwait(false);
-    }
-
-    #endregion
-
-    #region <T1, T2>
-    [Pure]
-    public static R Match<T1, T2, R>(this in Result<(T1, T2)> result, Func<T1, T2, R> onSuccess, Func<Error, R> onFailure)
-    {
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static Task<R> Match<T1, T2, R>(this in Result<(T1, T2)> result, Func<T1, T2, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
-    {
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<R> Match<T1, T2, R>(this Task<Result<(T1, T2)>> resultTask, Func<T1, T2, R> onSuccess, Func<Error, R> onFailure)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    [Pure]
-    public static async Task<R> Match<T1, T2, R>(this Task<Result<(T1, T2)>> resultTask, Func<T1, T2, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        var matchTask = result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-        return await matchTask.ConfigureAwait(false);
-    }
-
-    #endregion
-
-    #region <T1, T2, T3>
-    [Pure]
-    public static R Match<T1, T2, T3, R>(this in Result<(T1, T2, T3)> result, Func<T1, T2, T3, R> onSuccess, Func<Error, R> onFailure)
-    {
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2, result.Value.Item3),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static Task<R> Match<T1, T2, T3, R>(this in Result<(T1, T2, T3)> result, Func<T1, T2, T3, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
-    {
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2, result.Value.Item3),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<R> Match<T1, T2, T3, R>(this Task<Result<(T1, T2, T3)>> resultTask, Func<T1, T2, T3, R> onSuccess, Func<Error, R> onFailure)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2, result.Value.Item3),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    [Pure]
-    public static async Task<R> Match<T1, T2, T3, R>(this Task<Result<(T1, T2, T3)>> resultTask, Func<T1, T2, T3, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        var matchTask = result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2, result.Value.Item3),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-        return await matchTask.ConfigureAwait(false);
-    }
-
-    #endregion
-
-    #region <T1, T2, T3, T4>
-    [Pure]
-    public static R Match<T1, T2, T3, T4, R>(this in Result<(T1, T2, T3, T4)> result, Func<T1, T2, T3, T4, R> onSuccess, Func<Error, R> onFailure)
-    {
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static Task<R> Match<T1, T2, T3, T4, R>(this in Result<(T1, T2, T3, T4)> result, Func<T1, T2, T3, T4, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
-    {
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<R> Match<T1, T2, T3, T4, R>(this Task<Result<(T1, T2, T3, T4)>> resultTask, Func<T1, T2, T3, T4, R> onSuccess, Func<Error, R> onFailure)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    [Pure]
-    public static async Task<R> Match<T1, T2, T3, T4, R>(this Task<Result<(T1, T2, T3, T4)>> resultTask, Func<T1, T2, T3, T4, Task<R>> onSuccess, Func<Error, Task<R>> onFailure)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        var matchTask = result.State switch
-        {
-            ResultState.Success => onSuccess(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4),
-            ResultState.Error => onFailure(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-        return await matchTask.ConfigureAwait(false);
-    }
-
-    #endregion
-
-    #endregion
-
-    #region Map
-
-    #region <>
+    #region Map<>
 
     [Pure]
     public static Result<R> Map<R>(this in Result result, Func<R> mapping)
@@ -306,211 +101,7 @@ public static class ResultExtensions
 
     #endregion
 
-    #region <T>
-
-    [Pure]
-    public static Result<R> Map<T, R>(this in Result<T> result, Func<T, R> mapping)
-    {
-        return result.State switch
-        {
-            ResultState.Success => mapping(result.Value),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T, R>(this Result<T> result, Func<T, Task<R>> mapping)
-    {
-        return result.State switch
-        {
-            ResultState.Success => await mapping(result.Value).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T, R>(this Task<Result<T>> resultTask, Func<T, R> mapping)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => mapping(result.Value),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T, R>(this Task<Result<T>> resultTask, Func<T, Task<R>> mapping)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => await mapping(result.Value).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    #endregion
-
-    #region <T1, T2>
-
-    [Pure]
-    public static Result<R> Map<T1, T2, R>(this in Result<(T1, T2)> result, Func<T1, T2, R> mapping)
-    {
-        return result.State switch
-        {
-            ResultState.Success => mapping(result.Value.Item1, result.Value.Item2),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T1, T2, R>(this Result<(T1, T2)> result, Func<T1, T2, Task<R>> mapping)
-    {
-        return result.State switch
-        {
-            ResultState.Success => await mapping(result.Value.Item1, result.Value.Item2).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T1, T2, R>(this Task<Result<(T1, T2)>> resultTask, Func<T1, T2, R> mapping)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => mapping(result.Value.Item1, result.Value.Item2),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T1, T2, R>(this Task<Result<(T1, T2)>> resultTask, Func<T1, T2, Task<R>> mapping)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => await mapping(result.Value.Item1, result.Value.Item2).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    #endregion
-
-    #region <T1, T2, T3>
-
-    [Pure]
-    public static Result<R> Map<T1, T2, T3, R>(this in Result<(T1, T2, T3)> result, Func<T1, T2, T3, R> mapping)
-    {
-        return result.State switch
-        {
-            ResultState.Success => mapping(result.Value.Item1, result.Value.Item2, result.Value.Item3),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T1, T2, T3, R>(this Result<(T1, T2, T3)> result, Func<T1, T2, T3, Task<R>> mapping)
-    {
-        return result.State switch
-        {
-            ResultState.Success => await mapping(result.Value.Item1, result.Value.Item2, result.Value.Item3).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T1, T2, T3, R>(this Task<Result<(T1, T2, T3)>> resultTask, Func<T1, T2, T3, R> mapping)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => mapping(result.Value.Item1, result.Value.Item2, result.Value.Item3),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T1, T2, T3, R>(this Task<Result<(T1, T2, T3)>> resultTask, Func<T1, T2, T3, Task<R>> mapping)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => await mapping(result.Value.Item1, result.Value.Item2, result.Value.Item3).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    #endregion
-
-    #region <T1, T2, T3, T4>
-
-    [Pure]
-    public static Result<R> Map<T1, T2, T3, T4, R>(this in Result<(T1, T2, T3, T4)> result, Func<T1, T2, T3, T4, R> mapping)
-    {
-        return result.State switch
-        {
-            ResultState.Success => mapping(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T1, T2, T3, T4, R>(this Result<(T1, T2, T3, T4)> result, Func<T1, T2, T3, T4, Task<R>> mapping)
-    {
-        return result.State switch
-        {
-            ResultState.Success => await mapping(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T1, T2, T3, T4, R>(this Task<Result<(T1, T2, T3, T4)>> resultTask, Func<T1, T2, T3, T4, R> mapping)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => mapping(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    [Pure]
-    public static async Task<Result<R>> Map<T1, T2, T3, T4, R>(this Task<Result<(T1, T2, T3, T4)>> resultTask, Func<T1, T2, T3, T4, Task<R>> mapping)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => await mapping(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    #endregion
-
-    #endregion
-
-    #region Bind
-
-    #region <>
+    #region Bind<>
 
     [Pure]
     public static Result Bind(this in Result result, Func<Result> binding)
@@ -600,195 +191,6 @@ public static class ResultExtensions
 
     #endregion
 
-    #region <T>
-
-    [Pure]
-    public static Result<R> Bind<T, R>(this in Result<T> result, Func<T, Result<R>> binding)
-    {
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-    [Pure]
-    public static Task<Result<R>> Bind<T, R>(this in Result<T> result, Func<T, Task<Result<R>>> binding)
-    {
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value),
-            ResultState.Error => Task.FromResult<Result<R>>(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-    [Pure]
-    public static async Task<Result<R>> Bind<T, R>(this Task<Result<T>> resultTask, Func<T, Result<R>> binding)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-    [Pure]
-    public static async Task<Result<R>> Bind<T, R>(this Task<Result<T>> resultTask, Func<T, Task<Result<R>>> binding)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => await binding(result.Value).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    #endregion
-
-    #region <T1, T2>
-
-    [Pure]
-    public static Result<R> Bind<T1, T2, R>(this in Result<(T1, T2)> result, Func<T1, T2, Result<R>> binding)
-    {
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value.Item1, result.Value.Item2),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-    [Pure]
-    public static Task<Result<R>> Bind<T1, T2, R>(this in Result<(T1, T2)> result, Func<T1, T2, Task<Result<R>>> binding)
-    {
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value.Item1, result.Value.Item2),
-            ResultState.Error => Task.FromResult<Result<R>>(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-    [Pure]
-    public static async Task<Result<R>> Bind<T1, T2, R>(this Task<Result<(T1, T2)>> resultTask, Func<T1, T2, Result<R>> binding)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value.Item1, result.Value.Item2),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-    [Pure]
-    public static async Task<Result<R>> Bind<T1, T2, R>(this Task<Result<(T1, T2)>> resultTask, Func<T1, T2, Task<Result<R>>> binding)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => await binding(result.Value.Item1, result.Value.Item2).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    #endregion
-
-    #region <T1, T2, T3>
-
-    [Pure]
-    public static Result<R> Bind<T1, T2, T3, R>(this in Result<(T1, T2, T3)> result, Func<T1, T2, T3, Result<R>> binding)
-    {
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value.Item1, result.Value.Item2, result.Value.Item3),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-    [Pure]
-    public static Task<Result<R>> Bind<T1, T2, T3, R>(this in Result<(T1, T2, T3)> result, Func<T1, T2, T3, Task<Result<R>>> binding)
-    {
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value.Item1, result.Value.Item2, result.Value.Item3),
-            ResultState.Error => Task.FromResult<Result<R>>(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-    [Pure]
-    public static async Task<Result<R>> Bind<T1, T2, T3, R>(this Task<Result<(T1, T2, T3)>> resultTask, Func<T1, T2, T3, Result<R>> binding)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value.Item1, result.Value.Item2, result.Value.Item3),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-    [Pure]
-    public static async Task<Result<R>> Bind<T1, T2, T3, R>(this Task<Result<(T1, T2, T3)>> resultTask, Func<T1, T2, T3, Task<Result<R>>> binding)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => await binding(result.Value.Item1, result.Value.Item2, result.Value.Item3).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    #endregion
-
-    #region <T1, T2, T3, T4>
-
-    [Pure]
-    public static Result<R> Bind<T1, T2, T3, T4, R>(this in Result<(T1, T2, T3, T4)> result, Func<T1, T2, T3, T4, Result<R>> binding)
-    {
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-    [Pure]
-    public static Task<Result<R>> Bind<T1, T2, T3, T4, R>(this in Result<(T1, T2, T3, T4)> result, Func<T1, T2, T3, T4, Task<Result<R>>> binding)
-    {
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4),
-            ResultState.Error => Task.FromResult<Result<R>>(result.Error!),
-            _ => throw new ResultNotInitializedException(nameof(result))
-        };
-    }
-    [Pure]
-    public static async Task<Result<R>> Bind<T1, T2, T3, T4, R>(this Task<Result<(T1, T2, T3, T4)>> resultTask, Func<T1, T2, T3, T4, Result<R>> binding)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => binding(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-    [Pure]
-    public static async Task<Result<R>> Bind<T1, T2, T3, T4, R>(this Task<Result<(T1, T2, T3, T4)>> resultTask, Func<T1, T2, T3, T4, Task<Result<R>>> binding)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        return result.State switch
-        {
-            ResultState.Success => await binding(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4).ConfigureAwait(false),
-            ResultState.Error => result.Error!,
-            _ => throw new ResultNotInitializedException(nameof(resultTask))
-        };
-    }
-
-    #endregion
-    #endregion    
-
     #region Append
 
     #region <>
@@ -1284,7 +686,7 @@ public static class ResultExtensions
 
     #endregion
 
-    #region Tap
+    #region Tap<>
     [Pure]
     public static ref readonly Result Tap(this in Result result, Action? onSuccess = null, Action<Error>? onFailure = null)
     {
@@ -1360,289 +762,6 @@ public static class ResultExtensions
         return result;
     }
 
-    [Pure]
-    public static ref readonly Result<T> Tap<T>(this in Result<T> result, Action<T>? onSuccess = null, Action<Error>? onFailure = null)
-    {
-        switch (result.State)
-        {
-            case ResultState.Success:
-                onSuccess?.Invoke(result.Value!);
-                break;
-            case ResultState.Error:
-                onFailure?.Invoke(result.Error!);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(result));
-        }
-        return ref result;
-    }
-    [Pure]
-    public static async Task<Result<T>> Tap<T>(this Task<Result<T>> resultTask, Action<T>? onSuccess = null, Action<Error>? onFailure = null)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        switch (result.State)
-        {
-            case ResultState.Success:
-                onSuccess?.Invoke(result.Value!);
-                break;
-            case ResultState.Error:
-                onFailure?.Invoke(result.Error!);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(resultTask));
-        }
-        return result;
-    }
-    [Pure]
-    public static async Task<Result<T>> Tap<T>(this Result<T> result, Func<T, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
-    {
-        switch (result.State)
-        {
-            case ResultState.Success:
-                if (onSuccess is not null)
-                    await onSuccess.Invoke(result.Value!).ConfigureAwait(false);
-                break;
-            case ResultState.Error:
-                if (onFailure is not null)
-                    await onFailure.Invoke(result.Error!).ConfigureAwait(false);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(result));
-        }
-        return result;
-    }
-    [Pure]
-    public static async Task<Result<T>> Tap<T>(this Task<Result<T>> resultTask, Func<T, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        switch (result.State)
-        {
-            case ResultState.Success:
-                if (onSuccess is not null)
-                    await onSuccess.Invoke(result.Value!).ConfigureAwait(false);
-                break;
-            case ResultState.Error:
-                if (onFailure is not null)
-                    await onFailure.Invoke(result.Error!).ConfigureAwait(false);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(resultTask));
-        }
-        return result;
-    }
-
-    [Pure]
-    public static ref readonly Result<(T1, T2)> Tap<T1, T2>(this in Result<(T1, T2)> result, Action<T1, T2>? onSuccess = null, Action<Error>? onFailure = null)
-    {
-        switch (result.State)
-        {
-            case ResultState.Success:
-                onSuccess?.Invoke(result.Value.Item1, result.Value.Item2);
-                break;
-            case ResultState.Error:
-                onFailure?.Invoke(result.Error!);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(result));
-        }
-        return ref result;
-    }
-    [Pure]
-    public static async Task<Result<(T1, T2)>> Tap<T1, T2>(this Task<Result<(T1, T2)>> resultTask, Action<T1, T2>? onSuccess = null, Action<Error>? onFailure = null)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        switch (result.State)
-        {
-            case ResultState.Success:
-                onSuccess?.Invoke(result.Value.Item1, result.Value.Item2);
-                break;
-            case ResultState.Error:
-                onFailure?.Invoke(result.Error!);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(resultTask));
-        }
-        return result;
-    }
-    [Pure]
-    public static async Task<Result<(T1, T2)>> Tap<T1, T2>(this Result<(T1, T2)> result, Func<T1, T2, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
-    {
-        switch (result.State)
-        {
-            case ResultState.Success:
-                if (onSuccess is not null)
-                    await onSuccess.Invoke(result.Value.Item1, result.Value.Item2).ConfigureAwait(false);
-                break;
-            case ResultState.Error:
-                if (onFailure is not null)
-                    await onFailure.Invoke(result.Error!).ConfigureAwait(false);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(result));
-        }
-        return result;
-    }
-    [Pure]
-    public static async Task<Result<(T1, T2)>> Tap<T1, T2>(this Task<Result<(T1, T2)>> resultTask, Func<T1, T2, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        switch (result.State)
-        {
-            case ResultState.Success:
-                if (onSuccess is not null)
-                    await onSuccess.Invoke(result.Value.Item1, result.Value.Item2).ConfigureAwait(false);
-                break;
-            case ResultState.Error:
-                if (onFailure is not null)
-                    await onFailure.Invoke(result.Error!).ConfigureAwait(false);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(resultTask));
-        }
-        return result;
-    }
-
-    [Pure]
-    public static ref readonly Result<(T1, T2, T3)> Tap<T1, T2, T3>(this in Result<(T1, T2, T3)> result, Action<T1, T2, T3>? onSuccess = null, Action<Error>? onFailure = null)
-    {
-        switch (result.State)
-        {
-            case ResultState.Success:
-                onSuccess?.Invoke(result.Value.Item1, result.Value.Item2, result.Value.Item3);
-                break;
-            case ResultState.Error:
-                onFailure?.Invoke(result.Error!);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(result));
-        }
-        return ref result;
-    }
-    [Pure]
-    public static async Task<Result<(T1, T2, T3)>> Tap<T1, T2, T3>(this Task<Result<(T1, T2, T3)>> resultTask, Action<T1, T2, T3>? onSuccess = null, Action<Error>? onFailure = null)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        switch (result.State)
-        {
-            case ResultState.Success:
-                onSuccess?.Invoke(result.Value.Item1, result.Value.Item2, result.Value.Item3);
-                break;
-            case ResultState.Error:
-                onFailure?.Invoke(result.Error!);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(resultTask));
-        }
-        return result;
-    }
-    [Pure]
-    public static async Task<Result<(T1, T2, T3)>> Tap<T1, T2, T3>(this Result<(T1, T2, T3)> result, Func<T1, T2, T3, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
-    {
-        switch (result.State)
-        {
-            case ResultState.Success:
-                if (onSuccess is not null)
-                    await onSuccess.Invoke(result.Value.Item1, result.Value.Item2, result.Value.Item3).ConfigureAwait(false);
-                break;
-            case ResultState.Error:
-                if (onFailure is not null)
-                    await onFailure.Invoke(result.Error!).ConfigureAwait(false);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(result));
-        }
-        return result;
-    }
-    [Pure]
-    public static async Task<Result<(T1, T2, T3)>> Tap<T1, T2, T3>(this Task<Result<(T1, T2, T3)>> resultTask, Func<T1, T2, T3, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        switch (result.State)
-        {
-            case ResultState.Success:
-                if (onSuccess is not null)
-                    await onSuccess.Invoke(result.Value.Item1, result.Value.Item2, result.Value.Item3).ConfigureAwait(false);
-                break;
-            case ResultState.Error:
-                if (onFailure is not null)
-                    await onFailure.Invoke(result.Error!).ConfigureAwait(false);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(resultTask));
-        }
-        return result;
-    }
-
-    [Pure]
-    public static ref readonly Result<(T1, T2, T3, T4)> Tap<T1, T2, T3, T4>(this in Result<(T1, T2, T3, T4)> result, Action<T1, T2, T3, T4>? onSuccess = null, Action<Error>? onFailure = null)
-    {
-        switch (result.State)
-        {
-            case ResultState.Success:
-                onSuccess?.Invoke(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4);
-                break;
-            case ResultState.Error:
-                onFailure?.Invoke(result.Error!);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(result));
-        }
-        return ref result;
-    }
-    [Pure]
-    public static async Task<Result<(T1, T2, T3, T4)>> Tap<T1, T2, T3, T4>(this Task<Result<(T1, T2, T3, T4)>> resultTask, Action<T1, T2, T3, T4>? onSuccess = null, Action<Error>? onFailure = null)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        switch (result.State)
-        {
-            case ResultState.Success:
-                onSuccess?.Invoke(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4);
-                break;
-            case ResultState.Error:
-                onFailure?.Invoke(result.Error!);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(resultTask));
-        }
-        return result;
-    }
-    [Pure]
-    public static async Task<Result<(T1, T2, T3, T4)>> Tap<T1, T2, T3, T4>(this Result<(T1, T2, T3, T4)> result, Func<T1, T2, T3, T4, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
-    {
-        switch (result.State)
-        {
-            case ResultState.Success:
-                if (onSuccess is not null)
-                    await onSuccess.Invoke(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4).ConfigureAwait(false);
-                break;
-            case ResultState.Error:
-                if (onFailure is not null)
-                    await onFailure.Invoke(result.Error!).ConfigureAwait(false);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(result));
-        }
-        return result;
-    }
-    [Pure]
-    public static async Task<Result<(T1, T2, T3, T4)>> Tap<T1, T2, T3, T4>(this Task<Result<(T1, T2, T3, T4)>> resultTask, Func<T1, T2, T3, T4, Task>? onSuccess = null, Func<Error, Task>? onFailure = null)
-    {
-        var result = await resultTask.ConfigureAwait(false);
-        switch (result.State)
-        {
-            case ResultState.Success:
-                if (onSuccess is not null)
-                    await onSuccess.Invoke(result.Value.Item1, result.Value.Item2, result.Value.Item3, result.Value.Item4).ConfigureAwait(false);
-                break;
-            case ResultState.Error:
-                if (onFailure is not null)
-                    await onFailure.Invoke(result.Error!).ConfigureAwait(false);
-                break;
-
-            default: throw new ResultNotInitializedException(nameof(resultTask));
-        }
-        return result;
-    }
 #endregion
 
     #region Merge

Raliway.Tests/Results/GeneralUsage.cs

@@ -135,7 +135,7 @@ public class GeneralUsage
                     return "satisfied";
                 }
             );
-        
+
         // Then
         Assert.Equal("satisfied", result);
     }