96 lines
4.1 KiB
C#
96 lines
4.1 KiB
C#
using System.Collections.Immutable;
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using System.Linq;
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using System.Text;
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using Microsoft.CodeAnalysis;
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namespace Just.Railway.SourceGen;
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internal sealed class ResultBindExecutor : ResultExtensionsExecutor
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{
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protected override string ExtensionType => "Bind";
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protected override void GenerateMethodsForArgCount(StringBuilder sb, int argCount)
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{
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var templateArgNames = Enumerable.Range(1, argCount)
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.Select(i => $"T{i}")
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.ToImmutableArray();
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string resultTypeDef = GenerateResultTypeDef(templateArgNames);
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string resultValueExpansion = GenerateResultValueExpansion(templateArgNames);
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string methodTemplateDecl = GenerateTemplateDecl(templateArgNames.Add("R"));
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string bindTemplateDecl = GenerateTemplateDecl(templateArgNames.Add("Result<R>"));
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sb.AppendLine($"#region {resultTypeDef}");
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sb.AppendLine($$"""
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[PureAttribute]
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[GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
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public static Result<R> Bind{{methodTemplateDecl}}(this in {{resultTypeDef}} result, Func{{bindTemplateDecl}} binding)
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{
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return result.State switch
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{
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ResultState.Success => binding({{resultValueExpansion}}),
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ResultState.Error => result.Error!,
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_ => throw new ResultNotInitializedException(nameof(result))
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};
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}
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""");
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GenerateAsyncMethods("Task", string.Empty, sb, templateArgNames, resultTypeDef, resultValueExpansion);
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GenerateAsyncMethods("ValueTask", "ValueTask", sb, templateArgNames, resultTypeDef, resultValueExpansion);
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sb.AppendLine("#endregion");
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}
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private static void GenerateAsyncMethods(string taskType, string methodSuffix, StringBuilder sb, ImmutableArray<string> templateArgNames, string resultTypeDef, string resultValueExpansion)
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{
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string methodTemplateDecl = GenerateTemplateDecl(templateArgNames.Add("R"));
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string bindTemplateDecl = GenerateTemplateDecl(templateArgNames.Add("Result<R>"));
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string asyncActionTemplateDecl = GenerateTemplateDecl(templateArgNames.Add($"{taskType}<Result<R>>"));
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sb.AppendLine($$"""
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[PureAttribute]
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[GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
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public static async {{taskType}}<Result<R>> Bind{{methodSuffix}}{{methodTemplateDecl}}(this {{taskType}}<{{resultTypeDef}}> resultTask, Func{{bindTemplateDecl}} binding)
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{
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var result = await resultTask.ConfigureAwait(false);
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return result.State switch
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{
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ResultState.Success => binding({{resultValueExpansion}}),
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ResultState.Error => result.Error!,
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_ => throw new ResultNotInitializedException(nameof(resultTask))
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};
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}
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""");
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sb.AppendLine($$"""
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[PureAttribute]
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[GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
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public static {{taskType}}<Result<R>> Bind{{methodSuffix}}{{methodTemplateDecl}}(this in {{resultTypeDef}} result, Func{{asyncActionTemplateDecl}} binding)
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{
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return result.State switch
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{
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ResultState.Success => binding({{resultValueExpansion}}),
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ResultState.Error => {{taskType}}.FromResult<Result<R>>(result.Error!),
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_ => throw new ResultNotInitializedException(nameof(result))
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};
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}
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""");
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sb.AppendLine($$"""
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[PureAttribute]
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[GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
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public static async {{taskType}}<Result<R>> Bind{{methodSuffix}}{{methodTemplateDecl}}(this {{taskType}}<{{resultTypeDef}}> resultTask, Func{{asyncActionTemplateDecl}} binding)
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{
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var result = await resultTask.ConfigureAwait(false);
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return result.State switch
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{
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ResultState.Success => await binding({{resultValueExpansion}}).ConfigureAwait(false),
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ResultState.Error => result.Error!,
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_ => throw new ResultNotInitializedException(nameof(resultTask))
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};
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}
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""");
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}
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}
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