commit 553dd3571e98fab2c571fcd2e2600c485ee6a183 Author: Khamraj Rohit Date: Mon Aug 26 16:44:09 2024 -0400 Initial commit diff --git a/.gitattributes b/.gitattributes new file mode 100644 index 0000000..dfe0770 --- /dev/null +++ b/.gitattributes @@ -0,0 +1,2 @@ +# Auto detect text files and perform LF normalization +* text=auto diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..8a30d25 --- /dev/null +++ b/.gitignore @@ -0,0 +1,398 @@ +## Ignore Visual Studio temporary files, build results, and +## files generated by popular Visual Studio add-ons. +## +## Get latest from https://github.com/github/gitignore/blob/main/VisualStudio.gitignore + +# User-specific files +*.rsuser +*.suo +*.user +*.userosscache +*.sln.docstates + +# User-specific files (MonoDevelop/Xamarin Studio) +*.userprefs + +# Mono auto generated files +mono_crash.* + +# Build results +[Dd]ebug/ +[Dd]ebugPublic/ +[Rr]elease/ +[Rr]eleases/ +x64/ +x86/ +[Ww][Ii][Nn]32/ +[Aa][Rr][Mm]/ +[Aa][Rr][Mm]64/ +bld/ +[Bb]in/ +[Oo]bj/ +[Ll]og/ +[Ll]ogs/ + +# Visual Studio 2015/2017 cache/options directory +.vs/ +# Uncomment if you have tasks that create the project's static files in wwwroot +#wwwroot/ + +# Visual Studio 2017 auto generated files +Generated\ Files/ + +# MSTest test Results +[Tt]est[Rr]esult*/ +[Bb]uild[Ll]og.* + +# NUnit +*.VisualState.xml +TestResult.xml +nunit-*.xml + +# Build Results of an ATL Project +[Dd]ebugPS/ +[Rr]eleasePS/ +dlldata.c + +# Benchmark Results +BenchmarkDotNet.Artifacts/ + +# .NET Core +project.lock.json +project.fragment.lock.json +artifacts/ + +# ASP.NET Scaffolding +ScaffoldingReadMe.txt + +# StyleCop +StyleCopReport.xml + +# Files built by Visual Studio +*_i.c +*_p.c +*_h.h +*.ilk +*.meta +*.obj +*.iobj +*.pch +*.pdb +*.ipdb +*.pgc +*.pgd +*.rsp +*.sbr +*.tlb +*.tli +*.tlh +*.tmp +*.tmp_proj +*_wpftmp.csproj +*.log +*.tlog +*.vspscc +*.vssscc +.builds +*.pidb +*.svclog +*.scc + +# Chutzpah Test files +_Chutzpah* + +# Visual C++ cache files +ipch/ +*.aps +*.ncb +*.opendb +*.opensdf +*.sdf +*.cachefile +*.VC.db +*.VC.VC.opendb + +# Visual Studio profiler +*.psess +*.vsp +*.vspx +*.sap + +# Visual Studio Trace Files +*.e2e + +# TFS 2012 Local Workspace +$tf/ + +# Guidance Automation Toolkit +*.gpState + +# ReSharper is a .NET coding add-in +_ReSharper*/ +*.[Rr]e[Ss]harper +*.DotSettings.user + +# TeamCity is a build add-in +_TeamCity* + +# DotCover is a Code Coverage Tool +*.dotCover + +# AxoCover is a Code Coverage Tool +.axoCover/* +!.axoCover/settings.json + +# Coverlet is a free, cross platform Code Coverage Tool +coverage*.json +coverage*.xml +coverage*.info + +# Visual Studio code coverage results +*.coverage +*.coveragexml + +# NCrunch +_NCrunch_* +.*crunch*.local.xml +nCrunchTemp_* + +# MightyMoose +*.mm.* +AutoTest.Net/ + +# Web workbench (sass) +.sass-cache/ + +# Installshield output folder +[Ee]xpress/ + +# DocProject is a documentation generator add-in +DocProject/buildhelp/ +DocProject/Help/*.HxT +DocProject/Help/*.HxC +DocProject/Help/*.hhc +DocProject/Help/*.hhk +DocProject/Help/*.hhp +DocProject/Help/Html2 +DocProject/Help/html + +# Click-Once directory +publish/ + +# Publish Web Output +*.[Pp]ublish.xml +*.azurePubxml +# Note: Comment the next line if you want to checkin your web deploy settings, +# but database connection strings (with potential passwords) will be unencrypted +*.pubxml +*.publishproj + +# Microsoft Azure Web App publish settings. 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IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/MaybeError.sln b/MaybeError.sln new file mode 100644 index 0000000..0ec4347 --- /dev/null +++ b/MaybeError.sln @@ -0,0 +1,31 @@ + +Microsoft Visual Studio Solution File, Format Version 12.00 +# Visual Studio Version 17 +VisualStudioVersion = 17.11.35219.272 +MinimumVisualStudioVersion = 10.0.40219.1 +Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MaybeError", "MaybeError\MaybeError.csproj", "{542F56CD-34E6-4B95-A75D-DFBC8CCC0E65}" +EndProject +Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "MaybeErrorTests", "MaybeErrorTests\MaybeErrorTests.csproj", "{17467BE9-78C3-4E03-B829-FD7AA2DFB116}" +EndProject +Global + GlobalSection(SolutionConfigurationPlatforms) = preSolution + Debug|Any CPU = Debug|Any CPU + Release|Any CPU = Release|Any CPU + EndGlobalSection + GlobalSection(ProjectConfigurationPlatforms) = postSolution + {542F56CD-34E6-4B95-A75D-DFBC8CCC0E65}.Debug|Any CPU.ActiveCfg = Debug|Any CPU + {542F56CD-34E6-4B95-A75D-DFBC8CCC0E65}.Debug|Any CPU.Build.0 = Debug|Any CPU + {542F56CD-34E6-4B95-A75D-DFBC8CCC0E65}.Release|Any CPU.ActiveCfg = Release|Any CPU + {542F56CD-34E6-4B95-A75D-DFBC8CCC0E65}.Release|Any CPU.Build.0 = Release|Any CPU + {17467BE9-78C3-4E03-B829-FD7AA2DFB116}.Debug|Any CPU.ActiveCfg = Debug|Any CPU + {17467BE9-78C3-4E03-B829-FD7AA2DFB116}.Debug|Any CPU.Build.0 = Debug|Any CPU + {17467BE9-78C3-4E03-B829-FD7AA2DFB116}.Release|Any CPU.ActiveCfg = Release|Any CPU + {17467BE9-78C3-4E03-B829-FD7AA2DFB116}.Release|Any CPU.Build.0 = Release|Any CPU + EndGlobalSection + GlobalSection(SolutionProperties) = preSolution + HideSolutionNode = FALSE + EndGlobalSection + GlobalSection(ExtensibilityGlobals) = postSolution + SolutionGuid = {94322BD7-955B-4456-B4B3-E46BEA356AA5} + EndGlobalSection +EndGlobal diff --git a/MaybeError/Maybe.cs b/MaybeError/Maybe.cs new file mode 100644 index 0000000..4977b01 --- /dev/null +++ b/MaybeError/Maybe.cs @@ -0,0 +1,208 @@ +using System.Diagnostics.CodeAnalysis; + +namespace MaybeError; + +public interface IMaybe where T: class where E : Error +{ + [MemberNotNullWhen(true, nameof(Error))] + bool HasError { get; } + bool HasValue { get; } + E? Error { get; } + T Value { get; } + + public T ValueOrDefault(T defaultValue) + { + if (HasError) + return defaultValue; + return Value; + } + + public T? ValueOrDefault() + { + if (HasError) + return default; + return Value; + } + + public R As(Func predicate) + { + return predicate(Value); + } + + public R? AsOrDefault(Func predicate) + { + if (HasError) + return default; + return predicate(Value); + } + + public R AsOrDefault(Func predicate, R defaultValue) + { + if (HasError) + return defaultValue; + return predicate(Value); + } +} + +public readonly struct Maybe : IMaybe where T : class where E: Error +{ + [MemberNotNullWhen(true, nameof(Error))] + public readonly bool HasError { get; } + public readonly bool HasValue { get; } + public readonly E? Error { get; } + public readonly T Value => HasError ? throw Error.GetException() : _value!; + + private readonly T? _value; + + public Maybe() + { + _value = default; + } + + public Maybe(T value) + { + _value = value; + HasValue = true; + } + + public Maybe(E e) + { + Error = e; + HasError = true; + _value = default; + } + + public static implicit operator Maybe(T value) + { + return new Maybe(value); + } + + public static implicit operator Maybe(E e) + { + return new Maybe(e); + } + + public static implicit operator T(Maybe value) + { + if (value.HasError) + throw value.Error.GetException(); + return value.Value; + } +} + + +public readonly struct Maybe : IMaybe where T : class +{ + [MemberNotNullWhen(true, nameof(Error))] + public readonly bool HasError { get; } + public readonly bool HasValue { get; } + public readonly Error? Error { get; } + public readonly T Value => HasError ? throw Error.GetException() : _value!; + + private readonly T? _value; + + public Maybe() + { + _value = default; + } + + public Maybe(T value) + { + _value = value; + HasValue = true; + } + + public Maybe(Exception e) + { + Error = new ExceptionError(e); + HasError = true; + _value = default; + } + + public Maybe(Error e) + { + Error = e; + HasError = true; + _value = default; + } + + public static implicit operator Maybe(T value) + { + return new Maybe(value); + } + + public static implicit operator Maybe(Exception e) + { + return new Maybe(e); + } + + public static implicit operator Maybe(Error e) + { + return new Maybe(e); + } + + public static implicit operator T(Maybe value) + { + if (value.HasError) + throw value.Error.GetException(); + return value.Value; + } + + +} + +public class Error(string message, string? details = null, string? debugDetails = null) +{ + public readonly string Message = message; + public readonly string? Details = details; + public readonly string? DebugDetails = debugDetails; + + public virtual Exception GetException() + { + return new Exception(Message); + } + + public override string ToString() + { + return $"{Message}\n{Details}\n{DebugDetails}"; + } + + public static implicit operator string(Error e) + { + return e.ToString(); + } +} + +public class ExceptionError : ExceptionError +{ + public ExceptionError(string message, Exception exception) : base(message, exception) + { + } + public ExceptionError(Exception exception) : base(exception) + { + } +} +public class ExceptionError : Error where T : Exception +{ + public T Exception { get; set; } + + public ExceptionError(string message, T exception) : base(message, exception.Message, exception.StackTrace) + { + Exception = exception; + } + + public ExceptionError(T exception) : base(exception.Message, debugDetails: exception.StackTrace) + { + Exception = exception; + } + + public override T GetException() + { + return Exception; + } + + public override string ToString() + { + return $"{Message}\n{Exception}"; + } +} \ No newline at end of file diff --git a/MaybeError/MaybeError.csproj b/MaybeError/MaybeError.csproj new file mode 100644 index 0000000..fa71b7a --- /dev/null +++ b/MaybeError/MaybeError.csproj @@ -0,0 +1,9 @@ + + + + net8.0 + enable + enable + + + diff --git a/MaybeError/MaybeExtensions.cs b/MaybeError/MaybeExtensions.cs new file mode 100644 index 0000000..ae60f1e --- /dev/null +++ b/MaybeError/MaybeExtensions.cs @@ -0,0 +1,73 @@ +#nullable enable + +namespace MaybeError; + +public static class MaybeExtensions +{ + public static T ValueOrDefault(this IValueMaybe maybe, T defaultValue) where T : struct where E : Error + { + if (maybe.HasError) + return defaultValue; + return maybe.Value; + } + + public static T? ValueOrDefault(this IValueMaybe maybe) where T : struct where E : Error + { + if (maybe.HasError) + return default; + return maybe.Value; + } + + public static R As(this IValueMaybe maybe, Func predicate) where T : struct where E : Error + { + return predicate(maybe.Value); + } + + public static R? AsOrDefault(this IValueMaybe maybe, Func predicate) where T : struct where E : Error + { + if (maybe.HasError) + return default; + return predicate(maybe.Value); + } + + public static R AsOrDefault(this IValueMaybe maybe, Func predicate, R defaultValue) where T : struct where E : Error + { + if (maybe.HasError) + return defaultValue; + return predicate(maybe.Value); + } + + + public static T ValueOrDefault(this IMaybe maybe, T defaultValue) where T : class where E : Error + { + if (maybe.HasError) + return defaultValue; + return maybe.Value; + } + + public static T? ValueOrDefault(this IMaybe maybe) where T : class where E : Error + { + if (maybe.HasError) + return default; + return maybe.Value; + } + + public static R As(this IMaybe maybe, Func predicate) where T : class where E : Error + { + return predicate(maybe.Value); + } + + public static R? AsOrDefault(this IMaybe maybe, Func predicate) where T : class where E : Error + { + if (maybe.HasError) + return default; + return predicate(maybe.Value); + } + + public static R AsOrDefault(this IMaybe maybe, Func predicate, R defaultValue) where T : class where E : Error + { + if (maybe.HasError) + return defaultValue; + return predicate(maybe.Value); + } +} diff --git a/MaybeError/ValueMaybe.cs b/MaybeError/ValueMaybe.cs new file mode 100644 index 0000000..09d55bc --- /dev/null +++ b/MaybeError/ValueMaybe.cs @@ -0,0 +1,117 @@ + +using System.Diagnostics.CodeAnalysis; + +namespace MaybeError; + +public interface IValueMaybe where T : struct where E : Error +{ + [MemberNotNullWhen(true, nameof(Error))] + bool HasError { get; } + bool HasValue => !HasError; + E? Error { get; } + T Value { get; } +} + +public readonly struct ValueMaybe : IValueMaybe where T : struct where E : Error +{ + [MemberNotNullWhen(true, nameof(Error))] + public readonly bool HasError { get; } + public readonly bool HasValue => !HasError; + public readonly E? Error { get; } + public readonly T Value => HasError ? throw Error.GetException() : _value; + + private readonly T _value; + + public ValueMaybe() + { + _value = default; + } + + public ValueMaybe(T value) + { + _value = value; + HasError = false; + } + + public ValueMaybe(E e) + { + Error = e; + HasError = true; + _value = default; + } + + public static implicit operator ValueMaybe(T value) + { + return new ValueMaybe(value); + } + + public static implicit operator ValueMaybe(E e) + { + return new ValueMaybe(e); + } + + public static implicit operator T(ValueMaybe value) + { + if (value.HasError) + throw value.Error.GetException(); + return value.Value; + } +} + +public readonly struct ValueMaybe : IValueMaybe where T : struct +{ + [MemberNotNullWhen(true, nameof(Error))] + public readonly bool HasError { get; } + public readonly bool HasValue => !HasError; + public readonly Error? Error { get; } + public readonly T Value => HasError ? throw Error.GetException() : _value; + + private readonly T _value; + + public ValueMaybe() + { + _value = default; + } + + public ValueMaybe(T value) + { + _value = value; + HasError = false; + } + + public ValueMaybe(Exception e) + { + Error = new ExceptionError(e); + HasError = true; + _value = default; + } + + public ValueMaybe(Error e) + { + Error = e; + HasError = true; + _value = default; + } + + public static implicit operator ValueMaybe(T value) + { + return new ValueMaybe(value); + } + + public static implicit operator ValueMaybe(Exception e) + { + return new ValueMaybe(e); + } + + public static implicit operator ValueMaybe(Error e) + { + return new ValueMaybe(e); + } + + public static implicit operator T(ValueMaybe value) + { + if (value.HasError) + throw value.Error.GetException(); + return value.Value; + } +} \ No newline at end of file diff --git a/MaybeErrorTests/MaybeErrorTests.csproj b/MaybeErrorTests/MaybeErrorTests.csproj new file mode 100644 index 0000000..de25c39 --- /dev/null +++ b/MaybeErrorTests/MaybeErrorTests.csproj @@ -0,0 +1,28 @@ + + + + net8.0 + enable + enable + + false + true + + + + + + + + + + + + + + + + + + + diff --git a/MaybeErrorTests/MaybeTests.cs b/MaybeErrorTests/MaybeTests.cs new file mode 100644 index 0000000..081f42e --- /dev/null +++ b/MaybeErrorTests/MaybeTests.cs @@ -0,0 +1,108 @@ +using MaybeError; + +namespace MaybeErrorTests; + +public class MaybeTests +{ + [Test] + public void HasValue() + { + Maybe value = "Test"; + if (value.HasValue) + Assert.That(value.Value, Is.EqualTo("Test")); + else + Assert.Fail(); + Assert.That(value.Error, Is.Null); + } + + [Test] + public void HasError() + { + Maybe value = new InvalidOperationException(); + if (value.HasError) + Assert.That(value.Error, Is.Not.Null); + else + Assert.Fail(); + Assert.Throws(() => value.Value.ToLower()); + } + + [Test] + public void ImplicitValue() + { + Maybe value = "Test"; + Assert.That(value == "Test", Is.True); + } + + [Test] + public void ImplicitError() + { + Maybe value = new InvalidOperationException(); + Assert.Throws(() => value.Value.ToString()); + } + + [Test] + public void ExplicitError() + { + Maybe value = new ExceptionError(new InvalidOperationException()); + Assert.Throws(() => value.Value.ToString()); + } + + [Test] + public void Error() + { + Maybe value = new Error("Test Error"); + Assert.Throws(() => value.Value.ToLower()); + Assert.That(value.HasError); + Assert.That(value.Error?.Message, Is.EqualTo("Test Error")); + } + + [Test] + public void ValueOrDefault() + { + Maybe value = "Test"; + Assert.That(value.ValueOrDefault(), Is.EqualTo("Test")); + + value = new InvalidOperationException(); + Assert.That(value.ValueOrDefault(), Is.Null); + } + + [Test] + public void ValueOrDefaultWithDefault() + { + Maybe value = "Test"; + Assert.That(value.ValueOrDefault("Err"), Is.EqualTo("Test")); + + value = new InvalidOperationException(); + Assert.That(value.ValueOrDefault("Err"), Is.EqualTo("Err")); + } + + [Test] + public void As() + { + Maybe value = "Test"; + Assert.That(value.As(v => v.Length), Is.EqualTo(4)); + + value = new InvalidOperationException(); + Assert.Throws(() => value.As(v => v.Length)); + } + + [Test] + public void AsOrDefault() + { + Maybe value = "Test"; + Assert.That(value.AsOrDefault(v => v.Length), Is.EqualTo(4)); + + value = new InvalidOperationException(); + Assert.That(value.AsOrDefault(v => v.Length), Is.EqualTo(0)); + } + + [Test] + public void AsOrDefaultWithValue() + { + Maybe value = "Test"; + Assert.That(value.AsOrDefault(v => v.Length, -4), Is.EqualTo(4)); + + value = new InvalidOperationException(); + Assert.That(value.AsOrDefault(v => v.Length, -4), Is.EqualTo(-4)); + } +} \ No newline at end of file diff --git a/MaybeErrorTests/ValueMaybeTests.cs b/MaybeErrorTests/ValueMaybeTests.cs new file mode 100644 index 0000000..991a5e3 --- /dev/null +++ b/MaybeErrorTests/ValueMaybeTests.cs @@ -0,0 +1,108 @@ +using MaybeError; + +namespace MaybeErrorTests; + +public class ValueMaybeTests +{ + [Test] + public void HasValue() + { + ValueMaybe value = 1; + if(value.HasValue) + Assert.That(value.Value, Is.EqualTo(1)); + else + Assert.Fail(); + Assert.That(value.Error, Is.Null); + } + + [Test] + public void HasError() + { + ValueMaybe value = new InvalidOperationException(); + if (value.HasError) + Assert.That(value.Error, Is.Not.Null); + else + Assert.Fail(); + Assert.Throws(() => value.Value.ToString()); + } + + [Test] + public void ImplicitValue() + { + ValueMaybe value = 1; + Assert.That(value == 1, Is.True); + } + + [Test] + public void ImplicitError() + { + ValueMaybe value = new InvalidOperationException(); + Assert.Throws(() => value.Value.ToString()); + } + + [Test] + public void ExplicitError() + { + ValueMaybe value = new ExceptionError(new InvalidOperationException()); + Assert.Throws(() => value.Value.ToString()); + } + + [Test] + public void Error() + { + ValueMaybe value = new Error("Test Error"); + Assert.Throws(() => value.Value.ToString()); + Assert.That(value.HasError); + Assert.That(value.Error?.Message, Is.EqualTo("Test Error")); + } + + [Test] + public void ValueOrDefault() + { + ValueMaybe value = 1; + Assert.That(value.ValueOrDefault(), Is.EqualTo(1)); + + value = new InvalidOperationException(); + Assert.That(value.ValueOrDefault(), Is.Null); + } + + [Test] + public void ValueOrDefaultWithDefault() + { + ValueMaybe value = 1; + Assert.That(value.ValueOrDefault(3), Is.EqualTo(1)); + + value = new InvalidOperationException(); + Assert.That(value.ValueOrDefault(3), Is.EqualTo(3)); + } + + [Test] + public void As() + { + ValueMaybe value = 1; + Assert.That(value.As(v => v.ToString()), Is.EqualTo("1")); + + value = new InvalidOperationException(); + Assert.Throws(() => value.As(v => v.ToString())); + } + + [Test] + public void AsOrDefault() + { + ValueMaybe value = 1; + Assert.That(value.AsOrDefault(v => v.ToString()), Is.EqualTo("1")); + + value = new InvalidOperationException(); + Assert.That(value.AsOrDefault(v => v.ToString()), Is.Null); + } + + [Test] + public void AsOrDefaultWithValue() + { + ValueMaybe value = 1; + Assert.That(value.AsOrDefault(v => v.ToString(), "err"), Is.EqualTo("1")); + + value = new InvalidOperationException(); + Assert.That(value.AsOrDefault(v => v.ToString(), "err"), Is.EqualTo("err")); + } +} \ No newline at end of file diff --git a/README.md b/README.md new file mode 100644 index 0000000..4107f07 --- /dev/null +++ b/README.md @@ -0,0 +1,2 @@ +# MaybeError + A simple library to allow "error as values" functionallity in C#