// Internal for testing
internal static string ResolveTagHelperTypeName(TagHelperAttributeDescriptionInfo info)
{
// A BoundAttributeDescriptor does not have a direct reference to its parent TagHelper.
// However, when it was constructed the parent TagHelper's type name was embedded into
// its DisplayName. In VSCode we can't use the DisplayName verbatim for descriptions
// because the DisplayName is typically too long to display properly. Therefore we need
// to break it apart and then reconstruct it in a reduced format.
// i.e. this is the format the display name comes in:
// ReturnTypeName SomeTypeName.SomePropertyName
// We must simplify the return type name before using it to determine the type name prefix
// because that is how the display name was originally built (a little hacky).
var simpleReturnType = GetSimpleName(info.ReturnTypeName);
// "ReturnTypeName "
var typeNamePrefixLength = simpleReturnType.Length + 1 /* space */;
// ".SomePropertyName"
var typeNameSuffixLength = /* . */ 1 + info.PropertyName.Length;
// "SomeTypeName"
var typeNameLength = info.DisplayName.Length - typeNamePrefixLength - typeNameSuffixLength;
var tagHelperTypeName = info.DisplayName.Substring(typeNamePrefixLength, typeNameLength);
return(tagHelperTypeName);
}
public void ResolveTagHelperTypeName_ExtractsTypeName_ComplexReturnType()
{
// Arrange
var info = new TagHelperAttributeDescriptionInfo(
displayName: "SomeReturnTypeName SomeTypeName.SomePropertyName",
propertyName: "SomePropertyName",
returnTypeName: "SomeReturnTypeName",
documentation: string.Empty);
// Act
var typeName = DefaultTagHelperDescriptionFactory.ResolveTagHelperTypeName(info);
// Assert
Assert.Equal("SomeTypeName", typeName);
}
