Scala.js string interpolation like java.text.MessageFormat

Format

object Format {

  /**
    * String interpolation [[java.text.MessageFormat]] style:
    * {{{
    *   format("{1} {0}", "world", "hello") // result: "hello world"
    *   format("{0} + {1} = {2}", 1, 2, "three") // result: "1 + 2 = three"
    *   format("{0} + {0} = {0}", 0) // throws MissingFormatArgumentException
    * }}}
    * @return
    */
  def format (text: String, args: Any*): String = {
    var scalaStyled = text
    val pattern = """{\d+}""".r
    pattern.findAllIn(text).matchData foreach {
      m => val singleMatch = m.group(0)
        var number = singleMatch.substring(1, singleMatch.length - 1).toInt
        // %0$s is not allowed so we add +1 to all numbers
        number = 1 + number
        scalaStyled = scalaStyled.replace(singleMatch, "%" + number + "$s")
    }
    scalaStyled.format(args:_*)
  }
}