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using System.Text.RegularExpressions;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;
namespace I2R.Endpoints;
[Generator]
public class EndpointGenerator : ISourceGenerator
{
private const string SourceGenereatedComment = "// Generated, probably smart to leave it be";
public void Initialize(GeneratorInitializationContext context) {
context.RegisterForSyntaxNotifications(() => new EndpointFinder());
}
private Diagnostic CreateDebugDiagnostic(string message) {
var descriptor = new DiagnosticDescriptor("debug", "Debug", message, "debug", DiagnosticSeverity.Warning, true);
return Diagnostic.Create(descriptor, null, "");
}
public class NeededInfo
{
public string BaseEndpointClassName { get; set; }
public string BaseEnpointNamespaceName { get; set; }
}
private NeededInfo ExtractNeededInfo(ClassDeclarationSyntax classDeclarationSyntax) {
var baseType = classDeclarationSyntax.BaseList?.Types.FirstOrDefault();
if (baseType == default) {
return default;
}
var fullTypeName = baseType?.Type.ToString();
var typeNamespace = GetNamespace(baseType);
var className = Regex.Match(fullTypeName, "(!?<).+?(?=>)").Value.Replace("<", "");
return new NeededInfo() {
BaseEndpointClassName = className,
BaseEnpointNamespaceName = typeNamespace
};
}
public void Execute(GeneratorExecutionContext context) {
var asyncEndpoints = ((EndpointFinder) context.SyntaxReceiver)?.AsyncEndpoints;
var syncEndpoints = ((EndpointFinder) context.SyntaxReceiver)?.SyncEndpoints;
if (asyncEndpoints == null) {
context.ReportDiagnostic(CreateDebugDiagnostic("no endpoints were found"));
return;
}
foreach (var endpoint in syncEndpoints) {
var info = ExtractNeededInfo(endpoint);
context.AddSource(info.BaseEndpointClassName + "s.g.cs", GetSyncSource(info.BaseEndpointClassName, info.BaseEnpointNamespaceName));
}
foreach (var endpoint in asyncEndpoints) {
var info = ExtractNeededInfo(endpoint);
context.AddSource(info.BaseEndpointClassName + "s.g.cs", GetAsyncSource(info.BaseEndpointClassName, info.BaseEnpointNamespaceName));
}
}
private string GetSyncSource(string className, string namespaceName) {
return $@"
{SourceGenereatedComment}
namespace {namespaceName};
public static partial class SyncEndpoint<T{className}>
{{
public static class Req<TRequest>
{{
public abstract class Res<TResponse> : {className}
{{
public abstract TResponse Handle(
TRequest request
);
}}
public abstract class NoRes : {className}
{{
public abstract void Handle(
TRequest request
);
}}
}}
public static class NoReq
{{
public abstract class Res<TResponse> : {className}
{{
public abstract TResponse Handle();
}}
public abstract class NoRes : {className}
{{
public abstract void Handle();
}}
}}
}}
";
}
private string GetAsyncSource(string className, string namespaceName) {
return $@"
{SourceGenereatedComment}
namespace {namespaceName};
public static partial class AsyncEndpoint<T>
{{
public static class Req<TRequest>
{{
public abstract class Res<TResponse> : {className}
{{
public abstract Task<TResponse> HandleAsync(
TRequest request,
CancellationToken cancellationToken = default
);
}}
public abstract class NoRes : {className}
{{
public abstract Task HandleAsync(
TRequest request,
CancellationToken cancellationToken = default
);
}}
}}
public static class NoReq
{{
public abstract class Res<TResponse> : {className}
{{
public abstract Task<TResponse> HandleAsync(
CancellationToken cancellationToken = default
);
}}
public abstract class NoRes : {className}
{{
public abstract Task HandleAsync(
CancellationToken cancellationToken = default
);
}}
}}
}}
";
}
// determine the namespace the class/enum/struct is declared in, if any
static string GetNamespace(BaseTypeSyntax syntax) {
// If we don't have a namespace at all we'll return an empty string
// This accounts for the "default namespace" case
var nameSpace = string.Empty;
// Get the containing syntax node for the type declaration
// (could be a nested type, for example)
var potentialNamespaceParent = syntax.Parent;
// Keep moving "out" of nested classes etc until we get to a namespace
// or until we run out of parents
while (potentialNamespaceParent != null &&
potentialNamespaceParent is not NamespaceDeclarationSyntax
&& potentialNamespaceParent is not FileScopedNamespaceDeclarationSyntax) {
potentialNamespaceParent = potentialNamespaceParent.Parent;
}
// Build up the final namespace by looping until we no longer have a namespace declaration
if (potentialNamespaceParent is BaseNamespaceDeclarationSyntax namespaceParent) {
// We have a namespace. Use that as the type
nameSpace = namespaceParent.Name.ToString();
// Keep moving "out" of the namespace declarations until we
// run out of nested namespace declarations
while (true) {
if (namespaceParent.Parent is not NamespaceDeclarationSyntax parent) {
break;
}
// Add the outer namespace as a prefix to the final namespace
nameSpace = $"{namespaceParent.Name}.{nameSpace}";
namespaceParent = parent;
}
}
// return the final namespace
return nameSpace;
}
}
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