s_mach.i18n.messages.MessageFormat.scala Maven / Gradle / Ivy

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package s_mach.i18n.messages

/**
  * Format for a message that can be either a literal, an interpolation
  * or a choice
  */
sealed trait MessageFormat
object MessageFormat {
  case class Literal(value: String) extends MessageFormat

  /**
    * A message format that requires arguments
    * @param parts parts of the interpolation (either a literal or an argument)
    */
  case class Interpolation(parts: Seq[Interpolation.Part]) extends MessageFormat
  object Interpolation {
    sealed trait Part
    object Part {
      case class Literal(value: String) extends Part

      /**
        * A interpolation part that should be replaced with the argument
        * specified by index
        * @param index index of argument to select
        */
      case class StringArg(index: Int) extends Part
    }
  }

  /**
    * A message format that converts a BigDecimal to a string. Choices
    * are used to display different strings based on a quantity value.
    * @param value function to convert quantity to string
    */
  case class Choice(value: BigDecimal => String) extends MessageFormat
}