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Fix #1638 (#1677)
* make Option (non-generic) abstract * make Argument (non-generic) abstract
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‎src/Common/ArgumentBuilder.cs‎

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@@ -0,0 +1,29 @@
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using System;
3+
using System.CommandLine;
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using System.Reflection;
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internal static class ArgumentBuilder
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{
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private static readonly ConstructorInfo _ctor;
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static ArgumentBuilder()
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{
12+
_ctor = typeof(Argument<string>).GetConstructor(new[] { typeof(string), typeof(string) });
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}
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public static Argument CreateArgument(Type valueType, string name = "value")
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{
17+
var argumentType = typeof(Argument<>).MakeGenericType(valueType);
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#if NET6_0_OR_GREATER
20+
var ctor = (ConstructorInfo)argumentType.GetMemberWithSameMetadataDefinitionAs(_ctor);
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#else
22+
var ctor = argumentType.GetConstructor(new[] { typeof(string), typeof(string) });
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#endif
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var option = (Argument)ctor.Invoke(new object[] { name, null });
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return option;
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}
29+
}

‎src/Common/OptionBuilder.cs‎

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@@ -0,0 +1,31 @@
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// Copyright (c) .NET Foundation and contributors. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
3+
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using System.Reflection;
5+
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namespace System.CommandLine.Utility;
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internal static class OptionBuilder
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{
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private static readonly ConstructorInfo _ctor;
11+
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static OptionBuilder()
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{
14+
_ctor = typeof(Option<string>).GetConstructor(new[] { typeof(string), typeof(string) });
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}
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public static Option CreateOption(string name, Type valueType)
18+
{
19+
var optionType = typeof(Option<>).MakeGenericType(valueType);
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#if NET6_0_OR_GREATER
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var ctor = (ConstructorInfo)optionType.GetMemberWithSameMetadataDefinitionAs(_ctor);
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#else
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var ctor = optionType.GetConstructor(new[] { typeof(string), typeof(string) });
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#endif
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27+
var option = (Option)ctor.Invoke(new object[] { name, null });
28+
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return option;
30+
}
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}

‎src/System.CommandLine.ApiCompatibility.Tests/ApiCompatibilityApprovalTests.System_CommandLine_api_is_not_changed.approved.txt‎

Lines changed: 4 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -1,12 +1,10 @@
11
System.CommandLine
2-
public class Argument : Symbol, System.CommandLine.Binding.IValueDescriptor, System.CommandLine.Completions.ICompletionSource
3-
.ctor()
4-
.ctor(System.String name = null, System.String description = null)
2+
public abstract class Argument : Symbol, System.CommandLine.Binding.IValueDescriptor, System.CommandLine.Completions.ICompletionSource
53
public ArgumentArity Arity { get; set; }
64
public CompletionSourceList Completions { get; }
75
public System.Boolean HasDefaultValue { get; }
86
public System.String HelpName { get; set; }
9-
public System.Type ValueType { get; set; }
7+
public System.Type ValueType { get; }
108
public System.Void AddValidator(System.CommandLine.Parsing.ValidateSymbolResult<System.CommandLine.Parsing.ArgumentResult> validate)
119
public System.Collections.Generic.IEnumerable<System.CommandLine.Completions.CompletionItem> GetCompletions(System.CommandLine.Completions.CompletionContext context)
1210
public System.Object GetDefaultValue()
@@ -21,7 +19,7 @@
2119
.ctor(Func<T> getDefaultValue)
2220
.ctor(System.String name, ParseArgument<T> parse, System.Boolean isDefault = False, System.String description = null)
2321
.ctor(ParseArgument<T> parse, System.Boolean isDefault = False)
24-
public System.Type ValueType { get; set; }
22+
public System.Type ValueType { get; }
2523
public struct ArgumentArity : System.ValueType, System.IEquatable<ArgumentArity>
2624
public static ArgumentArity ExactlyOne { get; }
2725
public static ArgumentArity OneOrMore { get; }
@@ -181,9 +179,7 @@
181179
public System.String UnrecognizedCommandOrArgument(System.String arg)
182180
public System.String VersionOptionCannotBeCombinedWithOtherArguments(System.String optionAlias)
183181
public System.String VersionOptionDescription()
184-
public class Option : IdentifierSymbol, System.CommandLine.Binding.IValueDescriptor, System.CommandLine.Completions.ICompletionSource
185-
.ctor(System.String name, System.String description = null, System.Type argumentType = null, System.Func<System.Object> getDefaultValue = null, ArgumentArity arity = null)
186-
.ctor(System.String[] aliases, System.String description = null, System.Type argumentType = null, System.Func<System.Object> getDefaultValue = null, ArgumentArity arity = null)
182+
public abstract class Option : IdentifierSymbol, System.CommandLine.Binding.IValueDescriptor, System.CommandLine.Completions.ICompletionSource
187183
public System.Boolean AllowMultipleArgumentsPerToken { get; set; }
188184
public System.String ArgumentHelpName { get; set; }
189185
public ArgumentArity Arity { get; set; }

‎src/System.CommandLine.Benchmarks/CommandLine/Perf_Parser_Options_Bare.cs‎

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -22,8 +22,9 @@ public class Perf_Parser_Options_Bare
2222
private IEnumerable<Option> GenerateTestOptions(int count, ArgumentArity arity)
2323
=> Enumerable.Range(0, count)
2424
.Select(i =>
25-
new Option($"-option{i}", arity: arity)
25+
new Option<string>($"-option{i}")
2626
{
27+
Arity = arity,
2728
Description = $"Description for -option {i} ...."
2829
}
2930
);
@@ -50,7 +51,7 @@ public void SetupTestOptions()
5051
[Benchmark]
5152
public Parser ParserFromOptions_Ctor()
5253
{
53-
return Utils.CreateParser(_testSymbols);
54+
return _testSymbols.CreateParser();
5455
}
5556

5657
[GlobalSetup(Target = nameof(ParserFromOptions_Parse))]

‎src/System.CommandLine.Benchmarks/CommandLine/Perf_Parser_Options_With_Arguments.cs‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -20,8 +20,9 @@ public class Perf_Parser_Options_With_Arguments
2020

2121
private IEnumerable<Option> GenerateTestOptions(int count, ArgumentArity arity)
2222
=> Enumerable.Range(0, count)
23-
.Select(i => new Option($"-option{i}", arity: arity)
23+
.Select(i => new Option<string>($"-option{i}")
2424
{
25+
Arity = arity,
2526
Description = $"Description for -option {i} ...."
2627
}
2728
);

‎src/System.CommandLine.Benchmarks/CommandLine/Perf_Parser_ParseResult.cs‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -20,7 +20,7 @@ public class Perf_Parser_ParseResult
2020

2121
public Perf_Parser_ParseResult()
2222
{
23-
var option = new Option("-opt");
23+
var option = new Option<bool>("-opt");
2424

2525
_testParser =
2626
new CommandLineBuilder(new RootCommand { option })

‎src/System.CommandLine.Benchmarks/CommandLine/Perf_Parser_TypoCorrection.cs‎

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@@ -22,7 +22,7 @@ public class Perf_Parser_TypoCorrection
2222

2323
public Perf_Parser_TypoCorrection()
2424
{
25-
var option = new Option("--0123456789");
25+
var option = new Option<bool>("--0123456789");
2626

2727
_testParser = new CommandLineBuilder(new RootCommand { option })
2828
.UseTypoCorrections()

‎src/System.CommandLine.Benchmarks/CommandLine/Perf_Suggestions.cs‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -29,15 +29,15 @@ private string[] GenerateSuggestionsArray(int count)
2929

3030
private IEnumerable<Option> GenerateOptionsArray(int count)
3131
=> Enumerable.Range(0, count)
32-
.Select(i => new Option($"suggestion{i}"));
32+
.Select(i => new Option<string>($"suggestion{i}"));
3333

3434
[Params(1, 5, 20, 100)]
3535
public int TestSuggestionsCount;
3636

3737
[GlobalSetup(Target = nameof(SuggestionsFromSymbol))]
3838
public void Setup_FromSymbol()
3939
{
40-
_testSymbol = new Option("--hello", arity: ArgumentArity.ExactlyOne)
40+
_testSymbol = new Option<string>("--hello")
4141
.AddCompletions(GenerateSuggestionsArray(TestSuggestionsCount));
4242
}
4343

‎src/System.CommandLine.DragonFruit/CommandLine.cs‎

Lines changed: 15 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -8,6 +8,7 @@
88
using System.CommandLine.NamingConventionBinder;
99
using System.CommandLine.Parsing;
1010
using System.CommandLine.Rendering;
11+
using System.CommandLine.Utility;
1112
using System.IO;
1213
using System.Linq;
1314
using System.Reflection;
@@ -163,18 +164,13 @@ public static void ConfigureFromMethod(
163164
command.AddOption(option);
164165
}
165166

166-
if (method.GetParameters()
167-
.FirstOrDefault(p => _argumentParameterNames.Contains(p.Name)) is ParameterInfo argsParam)
167+
if (method.GetParameters().FirstOrDefault(p => _argumentParameterNames.Contains(p.Name)) is { } argsParam)
168168
{
169-
var argument = new Argument
170-
{
171-
ValueType = argsParam.ParameterType,
172-
Name = argsParam.Name
173-
};
169+
var argument = ArgumentBuilder.CreateArgument(argsParam.ParameterType, argsParam.Name);
174170

175171
if (argsParam.HasDefaultValue)
176172
{
177-
if (argsParam.DefaultValue != null)
173+
if (argsParam.DefaultValue is not null)
178174
{
179175
argument.SetDefaultValue(argsParam.DefaultValue);
180176
}
@@ -296,11 +292,17 @@ public static Option BuildOption(this ParameterDescriptor parameter)
296292
{
297293
getDefaultValue = parameter.GetDefaultValue;
298294
}
299-
return new Option(
300-
parameter.BuildAlias(),
301-
parameter.ValueName,
302-
parameter.ValueType,
303-
getDefaultValue);
295+
296+
var option = OptionBuilder.CreateOption(parameter.BuildAlias(), parameter.ValueType);
297+
298+
option.Description = parameter.ValueName;
299+
300+
if (getDefaultValue is not null)
301+
{
302+
option.SetDefaultValueFactory(getDefaultValue);
303+
}
304+
305+
return option;
304306
}
305307

306308
private static string GetDefaultXmlDocsFileLocation(Assembly assembly)

‎src/System.CommandLine.DragonFruit/System.CommandLine.DragonFruit.csproj‎

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@@ -12,4 +12,9 @@
1212
<ProjectReference Include="..\System.CommandLine.NamingConventionBinder\System.CommandLine.NamingConventionBinder.csproj" />
1313
<Content Include="targets/*" PackagePath="build/$(TargetFramework)/" />
1414
</ItemGroup>
15+
16+
<ItemGroup>
17+
<Compile Include="..\Common\ArgumentBuilder.cs" Link="Utility\ArgumentBuilder.cs" />
18+
<Compile Include="..\Common\OptionBuilder.cs" Link="Utility\OptionBuilder.cs" />
19+
</ItemGroup>
1520
</Project>

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