85 lines
3.4 KiB
C#
85 lines
3.4 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 => $"T{i}")
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.ToImmutableArray();
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string separatedTemplateArgs = string.Join(", ", templateArgNames);
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sb.AppendLine($"#region <{separatedTemplateArgs}>");
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string resultValueType = templateArgNames.Length == 1 ? separatedTemplateArgs : $"({separatedTemplateArgs})";
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string resultValueExpansion = GenerateResultValueExpansion(templateArgNames);
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sb.AppendLine($$"""
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[PureAttribute]
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[GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
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public static Result<R> Bind<{{separatedTemplateArgs}}, R>(this in Result<{{resultValueType}}> result, Func<{{separatedTemplateArgs}}, Result<R>> binding)
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{
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return result.State switch
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{
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ResultState.Success => binding({{resultValueExpansion}}),
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ResultState.Error => result.Error!,
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_ => throw new ResultNotInitializedException(nameof(result))
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};
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}
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""");
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sb.AppendLine($$"""
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[PureAttribute]
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[GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
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public static Task<Result<R>> Bind<{{separatedTemplateArgs}}, R>(this in Result<{{resultValueType}}> result, Func<{{separatedTemplateArgs}}, Task<Result<R>>> 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 => Task.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($$"""
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[PureAttribute]
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[GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
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public static async Task<Result<R>> Bind<{{separatedTemplateArgs}}, R>(this Task<Result<{{resultValueType}}>> resultTask, Func<{{separatedTemplateArgs}}, Result<R>> binding)
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{
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var result = await resultTask.ConfigureAwait(false);
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return result.State switch
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{
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ResultState.Success => binding({{resultValueExpansion}}),
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ResultState.Error => result.Error!,
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_ => throw new ResultNotInitializedException(nameof(resultTask))
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};
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}
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""");
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sb.AppendLine($$"""
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[PureAttribute]
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[GeneratedCodeAttribute("{{nameof(ResultBindExecutor)}}", "1.0.0.0")]
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public static async Task<Result<R>> Bind<{{separatedTemplateArgs}}, R>(this Task<Result<{{resultValueType}}>> resultTask, Func<{{separatedTemplateArgs}}, Task<Result<R>>> 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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sb.AppendLine("#endregion");
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}
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}
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