extensions rework pt1

2026-07-13 22:20:47 +04:00
parent 46487a4794
commit 0e7986996f
30 changed files with 1476 additions and 160 deletions
@@ -0,0 +1,96 @@
+using System.Collections.Immutable;
+using System.Linq;
+using System.Text;
+using Just.Railway.SourceGen.Executors.ResultExtensions;
+using Microsoft.CodeAnalysis;
+
+namespace Just.Railway.SourceGen.Executors;
+
+internal class ResultMapExecutor : ResultExtensionsExecutor
+{
+    protected override string ExtensionType => "Map";
+    protected override string NamespaceName => "Just.Railway";
+    protected override string PartialClassName => "ResultExtensions";
+
+    protected override void GenerateMethodsForArgCount(StringBuilder sb, int argCount)
+    {
+        var templateArgNames = Enumerable.Range(1, argCount)
+            .Select(i => $"T{i}")
+            .ToImmutableArray();
+
+        string resultTypeDef = GenerateResultTypeDef(templateArgNames);
+        string resultValueExpansion = GenerateResultValueExpansion(templateArgNames);
+        string methodTemplateDecl = GenerateTemplateDecl(templateArgNames.Add("R"));
+
+        sb.AppendLine($"#region {resultTypeDef}");
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMapExecutor)}}", "1.0.0.0")]
+        public static Result<R> Map{{methodTemplateDecl}}(this in {{resultTypeDef}} result, Func{{methodTemplateDecl}} mapping)
+        {
+            return result.State switch
+            {
+                ResultState.Success => mapping({{resultValueExpansion}}),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(result))
+            };
+        }
+        """);
+
+        GenerateAsyncMethods("Task", string.Empty, sb, templateArgNames, resultTypeDef, resultValueExpansion);
+
+        sb.AppendLine("#endregion");
+    }
+
+    protected static void GenerateAsyncMethods(string taskType, string methodSuffix, StringBuilder sb, ImmutableArray<string> templateArgNames, string resultTypeDef, string resultValueExpansion)
+    {
+        var methodTemplateArgNames = templateArgNames.Add("R");
+        string methodTemplateDecl = GenerateTemplateDecl(methodTemplateArgNames);
+        string asyncActionTemplateDecl = GenerateTemplateDecl(templateArgNames.Add($"{taskType}<R>"));
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMapExecutor)}}", "1.0.0.0")]
+        public static async {{taskType}}<Result<R>> Map{{methodSuffix}}{{methodTemplateDecl}}(this {{taskType}}<{{resultTypeDef}}> resultTask, Func{{methodTemplateDecl}} 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($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMapExecutor)}}", "1.0.0.0")]
+        public static async {{taskType}}<Result<R>> Map{{methodSuffix}}{{methodTemplateDecl}}(this {{resultTypeDef}} result, Func{{asyncActionTemplateDecl}} mapping)
+        {
+            return result.State switch
+            {
+                ResultState.Success => await mapping({{resultValueExpansion}}).ConfigureAwait(false),
+                ResultState.Error => result.Error!,
+                _ => throw new ResultNotInitializedException(nameof(result))
+            };
+        }
+        """);
+
+        sb.AppendLine($$"""
+        [PureAttribute]
+        [GeneratedCodeAttribute("{{nameof(ResultMapExecutor)}}", "1.0.0.0")]
+        public static async {{taskType}}<Result<R>> Map{{methodSuffix}}{{methodTemplateDecl}}(this {{taskType}}<{{resultTypeDef}}> resultTask, Func{{asyncActionTemplateDecl}} 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))
+            };
+        }
+        """);
+    }
+}