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Result.cs
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using System;
using System.Collections.Generic;
using System.Text;
namespace LanguageServer
{
internal enum ResultTag
{
Success = 1,
Error = 2,
}
public class Result<T, TError>
{
public static Result<T, TError> Success(T success)
{
return new Result<T, TError>(ResultTag.Success, success, default(TError));
}
public static Result<T, TError> Error(TError error)
{
return new Result<T, TError>(ResultTag.Error, default(T), error);
}
private readonly ResultTag _tag;
private readonly T _success;
private readonly TError _error;
private Result(ResultTag tag, T success, TError error)
{
_tag = tag;
_success = success;
_error = error;
}
public T SuccessValue { get => _success; }
public TError ErrorValue { get => _error; }
public bool IsSuccess { get => _tag == ResultTag.Success; }
public bool IsError { get => _tag == ResultTag.Error; }
public Result<TResult, TError> Select<TResult>(Func<T, TResult> func) =>
this.IsSuccess
? Result<TResult, TError>.Success(func(this.SuccessValue))
: Result<TResult, TError>.Error(this.ErrorValue);
public Result<TResult, TErrorResult> Select<TResult, TErrorResult>(Func<T, TResult> funcSuccess, Func<TError, TErrorResult> funcError) =>
this.IsSuccess ? Result<TResult, TErrorResult>.Success(funcSuccess(this.SuccessValue)) :
this.IsError ? Result<TResult, TErrorResult>.Error(funcError(this.ErrorValue)) :
default(Result<TResult, TErrorResult>);
public TResult Handle<TResult>(Func<T, TResult> funcSuccess, Func<TError, TResult> funcError) =>
this.IsSuccess ? funcSuccess(this.SuccessValue) :
this.IsError ? funcError(this.ErrorValue) :
default(TResult);
public void Handle(Action<T> actionSuccess, Action<TError> actionError)
{
if (this.IsSuccess)
{
actionSuccess(this.SuccessValue);
}
else if (this.IsError)
{
actionError(this.ErrorValue);
}
}
public T HandleError(Func<TError, T> func) =>
this.IsError
? func(this.ErrorValue)
: this.SuccessValue;
}
public class VoidResult<TError>
{
public static VoidResult<TError> Success()
{
return new VoidResult<TError>(ResultTag.Success, default(TError));
}
public static VoidResult<TError> Error(TError error)
{
return new VoidResult<TError>(ResultTag.Error, error);
}
private readonly ResultTag _tag;
private readonly TError _error;
private VoidResult(ResultTag tag, TError error)
{
_tag = tag;
_error = error;
}
public TError ErrorValue { get => _error; }
public bool IsSuccess { get => _tag == ResultTag.Success; }
public bool IsError { get => _tag == ResultTag.Error; }
public Result<TResult, TError> Select<TResult>(Func<TResult> func) =>
this.IsSuccess
? Result<TResult, TError>.Success(func())
: Result<TResult, TError>.Error(this.ErrorValue);
public Result<TResult, TErrorResult> Select<TResult, TErrorResult>(Func<TResult> funcSuccess, Func<TError, TErrorResult> funcError) =>
this.IsSuccess ? Result<TResult, TErrorResult>.Success(funcSuccess()) :
this.IsError ? Result<TResult, TErrorResult>.Error(funcError(this.ErrorValue)) :
default(Result<TResult, TErrorResult>);
public TResult Handle<TResult>(Func<TResult> funcSuccess, Func<TError, TResult> funcError) =>
this.IsSuccess ? funcSuccess() :
this.IsError ? funcError(this.ErrorValue) :
default(TResult);
public void Handle(Action actionSuccess, Action<TError> actionError)
{
if (this.IsSuccess)
{
actionSuccess();
}
else if (this.IsError)
{
actionError(this.ErrorValue);
}
}
public void HandleError(Action<TError> actionError)
{
if (this.IsError) actionError(this.ErrorValue);
}
}
}