func unableToParseValueMessage()

in Sources/ArgumentParser/Usage/UsageGenerator.swift [396:425]

• 24 lines of code
• 7 McCabe index (conditional complexity)

  func unableToParseValueMessage(origin: InputOrigin, name: Name?, value: String, key: InputKey, error: Error?) -> String {
    let argumentValue = arguments(for: key).first
    let valueName = argumentValue?.valueName

    // We want to make the "best effort" in producing a custom error message.
    // We favor `LocalizedError.errorDescription` and fall back to
    // `CustomStringConvertible`. To opt in, return your custom error message
    // as the `description` property of `CustomStringConvertible`.
    let customErrorMessage: String = {
      switch error {
      case let err as LocalizedError where err.errorDescription != nil:
        return ": " + err.errorDescription! // !!! Checked above that this will not be nil
      case let err?:
        return ": " + String(describing: err)
      default:
        return argumentValue?.formattedValueList ?? ""
      }
    }()

    switch (name, valueName) {
    case let (n?, v?):
      return "The value '\(value)' is invalid for '\(n.synopsisString) <\(v)>'\(customErrorMessage)"
    case let (_, v?):
      return "The value '\(value)' is invalid for '<\(v)>'\(customErrorMessage)"
    case let (n?, _):
      return "The value '\(value)' is invalid for '\(n.synopsisString)'\(customErrorMessage)"
    case (nil, nil):
      return "The value '\(value)' is invalid.\(customErrorMessage)"
    }
  }