mal/impls/scala/printer.scala

import types.{MalList, MalVector, MalHashMap, MalFunction}


object printer {
  def _pr_str(obj: Any, print_readably: Boolean = true): String = {
    val _r = print_readably
    return obj match {
      case v: MalVector   => v.toString(_r)
      case l: MalList     => l.toString(_r)
      case hm: MalHashMap => hm.toString(_r)
      case s: String      => {
        if (s.length > 0 && s(0) == '\u029e') {
          ":" + s.substring(1,s.length)
        } else if (_r) {
          //println("here1: " + s)
          "\"" + s.replace("\\", "\\\\")
                  .replace("\"", "\\\"")
                  .replace("\n", "\\n") + "\""
        } else {
          s
        }
      }
      case Symbol(s)      => s
      case a: types.Atom  => "(atom " + a.value + ")"
      case null           => "nil"
      case _              => {
        if (obj.isInstanceOf[MalFunction]) {
          val f = obj.asInstanceOf[MalFunction]
          "<function (fn* " + _pr_str(f.params) + " " + _pr_str(f.ast) + ")>"
        } else {
          obj.toString
        }
      }
    }
  }

  def _pr_list(lst: List[Any], print_readably: Boolean = true,
               sep: String = " "): String = {
    lst.map{_pr_str(_, print_readably)}.mkString(sep)
  }
}

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