public static async Task <IImmutableSet <string> > DetectFeaturesAsync(
Compilation compilation,
CancellationToken cancellationToken = default)
{
var symbols = new StartupSymbols(compilation);
if (!symbols.HasRequiredSymbols)
{
// Cannot find ASP.NET Core types.
return(ImmutableHashSet <string> .Empty);
}
var features = ImmutableHashSet.CreateBuilder <string>();
// Find configure methods in the project's assembly
var configureMethods = ConfigureMethodVisitor.FindConfigureMethods(symbols, compilation.Assembly);
for (var i = 0; i < configureMethods.Count; i++)
{
var configureMethod = configureMethods[i];
// Handles the case where a method is using partial definitions. We don't expect this to occur, but still handle it correctly.
var syntaxReferences = configureMethod.DeclaringSyntaxReferences;
for (var j = 0; j < syntaxReferences.Length; j++)
{
var semanticModel = compilation.GetSemanticModel(syntaxReferences[j].SyntaxTree);
var syntax = await syntaxReferences[j].GetSyntaxAsync(cancellationToken).ConfigureAwait(false);
var operation = semanticModel.GetOperation(syntax, cancellationToken);
// Look for a call to one of the SignalR gestures that applies to the Configure method.
if (operation
.Descendants()
.OfType <IInvocationOperation>()
.Any(op => StartupFacts.IsSignalRConfigureMethodGesture(op.TargetMethod)))
{
features.Add(WellKnownFeatures.SignalR);
}
}
}
return(features.ToImmutable());
}
public void FindConfigureMethods_AtDifferentScopes()
{
// Arrange
var source = @"
using Microsoft.AspNetCore.Builder;
public class GlobalStartup
{
public void Configure(IApplicationBuilder app)
{
}
}
namespace Another
{
public class AnotherStartup
{
public void Configure(IApplicationBuilder app)
{
}
}
}
namespace ANamespace
{
public class Startup
{
public void ConfigureDevelopment(IApplicationBuilder app)
{
}
public class NestedStartup
{
public void ConfigureTest(IApplicationBuilder app)
{
}
}
}
}
namespace ANamespace.Nested
{
public class Startup
{
public void Configure(IApplicationBuilder app)
{
}
public class NestedStartup
{
public void Configure(IApplicationBuilder app)
{
}
}
}
}";
var expected = new string[]
{
"global::ANamespace.Nested.Startup.Configure",
"global::ANamespace.Nested.Startup.NestedStartup.Configure",
"global::ANamespace.Startup.ConfigureDevelopment",
"global::ANamespace.Startup.NestedStartup.ConfigureTest",
"global::Another.AnotherStartup.Configure",
"global::GlobalStartup.Configure",
};
var compilation = TestCompilation.Create(source);
var symbols = new StartupSymbols(compilation);
// Act
var results = ConfigureMethodVisitor.FindConfigureMethods(symbols, compilation.Assembly);
// Assert
var actual = results
.Select(m => m.ContainingType.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat) + "." + m.Name)
.OrderBy(s => s)
.ToArray();
Assert.Equal(expected, actual);
}