internal static string ResolveTagHelperTypeName(string returnTypeName, string propertyName, string displayName)
{
// 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).
if (!TypeNameStringResolver.TryGetSimpleName(returnTypeName, out var simpleReturnType))
{
simpleReturnType = returnTypeName;
}
// "ReturnTypeName "
var typeNamePrefixLength = simpleReturnType.Length + 1 /* space */;
// ".SomePropertyName"
var typeNameSuffixLength = /* . */ 1 + propertyName.Length;
// "SomeTypeName"
var typeNameLength = displayName.Length - typeNamePrefixLength - typeNameSuffixLength;
var tagHelperTypeName = displayName.Substring(typeNamePrefixLength, typeNameLength);
return(tagHelperTypeName);
}
public void GetSimpleName_SimplifiesPrimitiveTypes_ReturnsTrue(string typeName, string expectedTypeName)
{
// Arrange
// Act
var result = TypeNameStringResolver.TryGetSimpleName(typeName, out var resolvedTypeName);
// Assert
Assert.True(result);
Assert.Equal(expectedTypeName, resolvedTypeName);
}
public void TryGetSimpleName_NonPrimitiveType_ReturnsFalse()
{
// Arrange
var typeName = "Microsoft.AspNetCore.SomeType";
// Act
var result = TypeNameStringResolver.TryGetSimpleName(typeName, out var resolvedTypeName);
// Assert
Assert.False(result);
Assert.Null(resolvedTypeName);
}
