Add or override transforms for a type the library already provides an implementation for?

[CallumTodd7]

I'm struggling to add a custom transform for a string value. Is this supported by the library?

import Mustache

public extension StringProtocol {
  func transform(_ name: String) -> Any? {
    switch name {
    case "appendWithCake":
      self + "cake"
    default:
      nil
    }
  }
}

extension String: MustacheTransformable {}
extension Substring: MustacheTransformable {}

let template = try MustacheTemplate(string: """
{{ appendWithCake(value) }}
""")
let object: [String: Any] = ["value": "Cup"]
XCTAssertEqual(template.render(object), "Cupcake") // Actual: ""

[adam-fowler]

Currently it isn't possible to add additional transforms to a type that already has transforms. What is the transform you want to add? I assume it isn't the appendWithCake function.

[CallumTodd7]

Ah, that's a shame. Thanks for the reply.

I was looking to add a UTF8 base64 encoding transform. Not a huge issue for me now as I've got it working without transforms.

[tib]

I'd also like to write a custom transform for Strings, are you planning to provide an extension mechanism in the near future? 🤔