wip: create generator project

.gitignore

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+.vs/
+[Bb]in/
+[Oo]bj/

src/Geis.ScratchApp/Geis.ScratchApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference
+      Include="..\Geis.ValueParserGenerators\Geis.ValueParserGenerators.csproj"
+      OutputItemType="Analyzer"/>
+    <ProjectReference Include="..\Geis\Geis.csproj" />
+  </ItemGroup>
+
+</Project>

src/Geis.ScratchApp/Program.cs

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+using Geis;
+
+var collection = new ValueParserCollection();
+collection.AddDefaultParser<int>();
+collection.AddDefaultParser<bool>();

src/Geis.ValueParserGenerators/DefaultValueParserGenerator.cs

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+using Microsoft.CodeAnalysis;
+using Microsoft.CodeAnalysis.CSharp.Syntax;
+using System.Collections.Immutable;
+
+namespace Geis.ValueParserGenerators;
+
+[Generator]
+public class DefaultValueParserGenerator : IIncrementalGenerator
+{
+    public void Initialize(IncrementalGeneratorInitializationContext context)
+    {
+        //System.Diagnostics.Debugger.Launch();
+
+        var provider = context
+            .SyntaxProvider
+            .CreateSyntaxProvider(
+                predicate: (c, _) => c is GenericNameSyntax n,
+                transform: (n, _) => (GenericNameSyntax)n.Node)
+            .Where(x => x is not null);
+
+        var compilation = context.CompilationProvider.Combine(provider.Collect());
+
+        context.RegisterSourceOutput(
+            compilation,
+            (spc, source) => Execute(spc, source.Left, source.Right));
+    }
+
+    private void Execute(
+        SourceProductionContext context,
+        Compilation compilation,
+        ImmutableArray<GenericNameSyntax> genericNames)
+    {
+        foreach (var name in genericNames)
+        {
+            // todo: add explicitly constructor value parsers that reference the TryParse or new(string) member of T.
+
+            context.ReportDiagnostic(
+                Diagnostic.Create(
+                    new DiagnosticDescriptor(
+                        id: "GVPG0001",
+                        title: "Possible Reference To AddDefaultParser",
+                        messageFormat: "Found a possible reference to the AddDefaultParser method.",
+                        category: "Accomplishment",
+                        defaultSeverity: DiagnosticSeverity.Warning,
+                        isEnabledByDefault: true),
+                    name.GetLocation()));
+        }
+    }
+}

src/Geis.ValueParserGenerators/Geis.ValueParserGenerators.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <EnforceExtendedAnalyzerRules>true</EnforceExtendedAnalyzerRules>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.7.0" />
+  </ItemGroup>
+
+</Project>

src/Geis.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Geis.ValueParserGenerators", "Geis.ValueParserGenerators\Geis.ValueParserGenerators.csproj", "{388C1697-D0ED-4340-AE58-22CF614FD50D}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Geis", "Geis\Geis.csproj", "{8B1B4AA8-17E8-4A0C-946B-FD975A2598EA}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Geis.ScratchApp", "Geis.ScratchApp\Geis.ScratchApp.csproj", "{435D5879-9BB7-4106-BB3A-2B22750C08EF}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{388C1697-D0ED-4340-AE58-22CF614FD50D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{388C1697-D0ED-4340-AE58-22CF614FD50D}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{388C1697-D0ED-4340-AE58-22CF614FD50D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{388C1697-D0ED-4340-AE58-22CF614FD50D}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8B1B4AA8-17E8-4A0C-946B-FD975A2598EA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8B1B4AA8-17E8-4A0C-946B-FD975A2598EA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8B1B4AA8-17E8-4A0C-946B-FD975A2598EA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8B1B4AA8-17E8-4A0C-946B-FD975A2598EA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{435D5879-9BB7-4106-BB3A-2B22750C08EF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{435D5879-9BB7-4106-BB3A-2B22750C08EF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{435D5879-9BB7-4106-BB3A-2B22750C08EF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{435D5879-9BB7-4106-BB3A-2B22750C08EF}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {3043616A-5042-4512-816E-3345E1FA7AB3}
+	EndGlobalSection
+EndGlobal

src/Geis/Geis.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

src/Geis/ValueParserCollection.cs

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+namespace Geis;
+
+public class ValueParserCollection
+{
+    private readonly Dictionary<Type, Func<string, object?>> _parsers = new();
+
+    public ValueParserCollection SetParser<T>(Func<string, T?> parser) where T : notnull
+    {
+        _parsers[typeof(T)] = s => parser(s);
+        return this;
+    }
+}
+
+public static class ValueParserCollectionExtensions
+{
+    public static ValueParserCollection AddDefaultParser<T>(this ValueParserCollection collection) => collection;
+}