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Interpreter of a Sigma-State language

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package sigma.util

import debox.cfor

object StringUtil {
  final def quote(x: Any) = "\"" + x + "\""

  /** Emit string representation of `x` into given builder `sb`,
    * recursively descending into Array structure of `x`.
    */
  final def deepAppend(sb: StringBuilder, x: Any): Unit = {
    x match {
      case arr: Array[_] =>
        sb.append("Array(")
        if (arr.length > 0) {
          deepAppend(sb, arr(0))
          cfor(1)(_ < arr.length, _ + 1) { i =>
            sb.append(", ")
            deepAppend(sb, arr(i))
          }
        }
        sb.append(")")
      case s: String =>
        sb.append("\"")
        sb.append(s)
        sb.append("\"")
      case _ => sb.append(x)
    }
  }

  /** Accepts an arbitrary (printable) string and returns a similar string
    * which can be used as a file name. For convenience, replaces spaces with hyphens.
    */
  def cleanFileName(string: String) = string.
      replaceAll("""[ /\\:;<>|?*^]""", "_").
      replaceAll("""['"]""", "")

  /** Compose file name from components. */
  def fileName(file: String, pathComponents: String*): String = {
    val path = pathComponents.mkString("/")
    s"$file/$path"
  }

  implicit class StringUtilExtensions(val str: String) extends AnyVal {
    def isNullOrEmpty = str == null || str.isEmpty

    def opt(show: String => String = _.toString, default: String = ""): String =
      if (str.nonEmpty) show(str) else default
  }

}