public void Execute(TagHelperDescriptorProviderContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var compilation = context.GetCompilation();
if (compilation == null)
{
// No compilation, nothing to do.
return;
}
var vcAttribute = compilation.GetTypeByMetadataName(ViewComponentTypes.ViewComponentAttribute);
var nonVCAttribute = compilation.GetTypeByMetadataName(ViewComponentTypes.NonViewComponentAttribute);
if (vcAttribute == null || vcAttribute.TypeKind == TypeKind.Error)
{
// Could not find attributes we care about in the compilation. Nothing to do.
return;
}
var types = new List <INamedTypeSymbol>();
var visitor = new ViewComponentTypeVisitor(vcAttribute, nonVCAttribute, types);
var targetAssembly = context.Items.GetTargetAssembly();
if (targetAssembly is not null)
{
visitor.Visit(targetAssembly.GlobalNamespace);
}
else
{
visitor.Visit(compilation.Assembly.GlobalNamespace);
foreach (var reference in compilation.References)
{
if (compilation.GetAssemblyOrModuleSymbol(reference) is IAssemblySymbol assembly)
{
if (IsTagHelperAssembly(assembly))
{
visitor.Visit(assembly.GlobalNamespace);
}
}
}
}
var factory = new ViewComponentTagHelperDescriptorFactory(compilation);
for (var i = 0; i < types.Count; i++)
{
var descriptor = factory.CreateDescriptor(types[i]);
if (descriptor != null)
{
context.Results.Add(descriptor);
}
}
}
public void CreateDescriptor_ForViewComponentWithInvokeAsync_UnderstandsNonGenericTask()
{
// Arrange
var testCompilation = TestCompilation.Create(_assembly);
var factory = new ViewComponentTagHelperDescriptorFactory(testCompilation);
var viewComponent = testCompilation.GetTypeByMetadataName(typeof(AsyncViewComponentWithNonGenericTask).FullName);
// Act
var descriptor = factory.CreateDescriptor(viewComponent);
// Assert
Assert.Empty(descriptor.GetAllDiagnostics());
}
public void CreateDescriptor_ForViewComponentWithInvoke_DoesNotUnderstandGenericTask()
{
// Arrange
var testCompilation = TestCompilation.Create(_assembly);
var factory = new ViewComponentTagHelperDescriptorFactory(testCompilation);
var viewComponent = testCompilation.GetTypeByMetadataName(typeof(SyncViewComponentWithGenericTask).FullName);
// Act
var descriptor = factory.CreateDescriptor(viewComponent);
// Assert
var diagnostic = Assert.Single(descriptor.GetAllDiagnostics());
Assert.Equal(RazorExtensionsDiagnosticFactory.ViewComponent_SyncMethod_CannotReturnTask.Id, diagnostic.Id);
}
public void CreateDescriptor_AddsDiagnostic_ForViewComponentWithNoInvokeMethod()
{
// Arrange
var testCompilation = TestCompilation.Create(_assembly);
var factory = new ViewComponentTagHelperDescriptorFactory(testCompilation);
var viewComponent = testCompilation.GetTypeByMetadataName(typeof(ViewComponentWithoutInvokeMethod).FullName);
// Act
var descriptor = factory.CreateDescriptor(viewComponent);
// Assert
var diagnostic = Assert.Single(descriptor.GetAllDiagnostics());
Assert.Equal(RazorExtensionsDiagnosticFactory.ViewComponent_CannotFindMethod.Id, diagnostic.Id);
}
public void CreateDescriptor_ForViewComponent_WithAmbiguousMethods()
{
// Arrange
var testCompilation = TestCompilation.Create(_assembly);
var factory = new ViewComponentTagHelperDescriptorFactory(testCompilation);
var viewComponent = testCompilation.GetTypeByMetadataName(typeof(DerivedViewComponentWithAmbiguity).FullName);
// Act
var descriptor = factory.CreateDescriptor(viewComponent);
// Assert
var diagnostic = Assert.Single(descriptor.GetAllDiagnostics());
Assert.Equal(RazorExtensionsDiagnosticFactory.ViewComponent_AmbiguousMethods.Id, diagnostic.Id);
}
public void CreateDescriptor_UnderstandsVariousParameterTypes()
{
// Arrange
var testCompilation = TestCompilation.Create(_assembly);
var viewComponent = testCompilation.GetTypeByMetadataName(typeof(VariousParameterViewComponent).FullName);
var factory = new ViewComponentTagHelperDescriptorFactory(testCompilation);
var expectedDescriptor = TagHelperDescriptorBuilder.Create(
ViewComponentTagHelperConventions.Kind,
"__Generated__VariousParameterViewComponentTagHelper",
typeof(VariousParameterViewComponent).GetTypeInfo().Assembly.GetName().Name)
.TypeName("__Generated__VariousParameterViewComponentTagHelper")
.DisplayName("VariousParameterViewComponentTagHelper")
.TagMatchingRuleDescriptor(rule =>
rule
.RequireTagName("vc:various-parameter")
.RequireAttributeDescriptor(attribute => attribute.Name("test-enum"))
.RequireAttributeDescriptor(attribute => attribute.Name("test-string"))
.RequireAttributeDescriptor(attribute => attribute.Name("baz")))
.BoundAttributeDescriptor(attribute =>
attribute
.Name("test-enum")
.PropertyName("testEnum")
.TypeName(typeof(VariousParameterViewComponent).FullName + "." + nameof(VariousParameterViewComponent.TestEnum))
.AsEnum()
.DisplayName(typeof(VariousParameterViewComponent).FullName + "." + nameof(VariousParameterViewComponent.TestEnum) + " VariousParameterViewComponentTagHelper.testEnum"))
.BoundAttributeDescriptor(attribute =>
attribute
.Name("test-string")
.PropertyName("testString")
.TypeName(typeof(string).FullName)
.DisplayName("string VariousParameterViewComponentTagHelper.testString"))
.BoundAttributeDescriptor(attribute =>
attribute
.Name("baz")
.PropertyName("baz")
.TypeName(typeof(int).FullName)
.DisplayName("int VariousParameterViewComponentTagHelper.baz"))
.AddMetadata(ViewComponentTagHelperMetadata.Name, "VariousParameter")
.Build();
// Act
var descriptor = factory.CreateDescriptor(viewComponent);
// Assert
Assert.Equal(expectedDescriptor, descriptor, TagHelperDescriptorComparer.Default);
}
public void CreateDescriptor_ForSyncViewComponentWithInvokeInBaseType_Works()
{
// Arrange
var testCompilation = TestCompilation.Create(_assembly);
var factory = new ViewComponentTagHelperDescriptorFactory(testCompilation);
var expectedDescriptor = TagHelperDescriptorBuilder.Create(
ViewComponentTagHelperConventions.Kind,
"__Generated__SyncDerivedViewComponentTagHelper",
typeof(SyncDerivedViewComponent).GetTypeInfo().Assembly.GetName().Name)
.TypeName("__Generated__SyncDerivedViewComponentTagHelper")
.DisplayName("SyncDerivedViewComponentTagHelper")
.TagMatchingRuleDescriptor(rule =>
rule
.RequireTagName("vc:sync-derived")
.RequireAttributeDescriptor(attribute => attribute.Name("foo"))
.RequireAttributeDescriptor(attribute => attribute.Name("bar")))
.BoundAttributeDescriptor(attribute =>
attribute
.Name("foo")
.PropertyName("foo")
.TypeName(typeof(string).FullName)
.DisplayName("string SyncDerivedViewComponentTagHelper.foo"))
.BoundAttributeDescriptor(attribute =>
attribute
.Name("bar")
.PropertyName("bar")
.TypeName(typeof(string).FullName)
.DisplayName("string SyncDerivedViewComponentTagHelper.bar"))
.AddMetadata(ViewComponentTagHelperMetadata.Name, "SyncDerived")
.Build();
var viewComponent = testCompilation.GetTypeByMetadataName(typeof(SyncDerivedViewComponent).FullName);
// Act
var descriptor = factory.CreateDescriptor(viewComponent);
// Assert
Assert.Equal(expectedDescriptor, descriptor, TagHelperDescriptorComparer.Default);
}
public void CreateDescriptor_UnderstandsGenericParameters()
{
// Arrange
var testCompilation = TestCompilation.Create(_assembly);
var viewComponent = testCompilation.GetTypeByMetadataName(typeof(GenericParameterViewComponent).FullName);
var factory = new ViewComponentTagHelperDescriptorFactory(testCompilation);
var expectedDescriptor = TagHelperDescriptorBuilder.Create(
ViewComponentTagHelperConventions.Kind,
"__Generated__GenericParameterViewComponentTagHelper",
typeof(GenericParameterViewComponent).GetTypeInfo().Assembly.GetName().Name)
.TypeName("__Generated__GenericParameterViewComponentTagHelper")
.DisplayName("GenericParameterViewComponentTagHelper")
.TagMatchingRuleDescriptor(rule =>
rule
.RequireTagName("vc:generic-parameter")
.RequireAttributeDescriptor(attribute => attribute.Name("foo")))
.BoundAttributeDescriptor(attribute =>
attribute
.Name("foo")
.PropertyName("Foo")
.TypeName("System.Collections.Generic.List<System.String>")
.DisplayName("System.Collections.Generic.List<System.String> GenericParameterViewComponentTagHelper.Foo"))
.BoundAttributeDescriptor(attribute =>
attribute
.Name("bar")
.PropertyName("Bar")
.TypeName("System.Collections.Generic.Dictionary<System.String, System.Int32>")
.AsDictionaryAttribute("bar-", typeof(int).FullName)
.DisplayName("System.Collections.Generic.Dictionary<System.String, System.Int32> GenericParameterViewComponentTagHelper.Bar"))
.AddMetadata(ViewComponentTagHelperMetadata.Name, "GenericParameter")
.Build();
// Act
var descriptor = factory.CreateDescriptor(viewComponent);
// Assert
Assert.Equal(expectedDescriptor, descriptor, TagHelperDescriptorComparer.Default);
}
