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// printf書式文字列変換(お題 : http://ja.doukaku.org/259/)
// 
// Erlangの書式文字文字列  <--> C言語の書式文字列
// コマンドラインargs先頭で処理を指定、残りの引数で書式指定
// c2e : C --> Erlang
// e2c : Erlang --> C
// 例)
//    c2e %f  %020d  %.20d %+20.10d  %-20f %-20.10f
//    e2c ~f  ~20.0p ~.20p ~20.10p   ~-20f ~-20.10f
//    e2c ~10s ~-10s ~10.3.+s ~10.10.+s ~10.7.+s
//    ( ~10.3.+s ~10.10.+s ~10.7.+s はCの書式では正確に対応できません )
object Main {
  def main(args : Array[String]) : Unit = {
    args.toList match {
      case "e2c" :: xs =>
        for(x<-xs ; ErlFormatTerm(flag,termF,termP,termPad,termMod,termC) = x ) {
          //println(flag,termF,termP,termPad,termMod,termC)
          print (x + " ---> ")
          val flags = (flag,termPad) match{
            case ("-","" ) => "-"
            case ("-"," ") => "-"
            case ("-","0") => "-"
            case ("" ," ") => " "
            case ("" ,"0") => "0"
            case _ => ""
          }
          
          termC match {
            case "B" if termP=="8"  => println ( CFormatTerm(flags,termF,   "","o") )
            case "B" if termP=="16" => println ( CFormatTerm(flags,termF,   "","x") )
            case "c"                => println ( CFormatTerm(flags,termF,termP,"c") )
            case "s"                => println ( CFormatTerm(flags,termF,termP,"s") )
            case "f"                => println ( CFormatTerm(flags,termF,termP,"f") )
            case "e"                => println ( CFormatTerm(flags,termF,termP,"e") )
            case "g"                => println ( CFormatTerm(flags,termF,termP,"g") )
            //
            case _                  => println ( "未対応" )
          }
        }
      case "c2e" :: xs =>
        for(x<-xs ; CFormatTerm(flags,fieldWidth,precision,specifier) = x ) {
          print (x + " ---> ")
          val pad = flags match{
            case "+" => ""
            case "-" => ""
            case " " => ""
            case "0" => "0"
            case _ => ""
          }
          val flag = flags match{
            case "-" => "-"
            //
            case "+" => ""
            case " " => ""
            case "0" => ""
            case _   => ""
          }
          specifier match{    // F P Pad Mod C
            case "d" | "i" => println ( ErlFormatTerm(flag,fieldWidth,precision,pad,"","p") )
            case "u"       => println ( ErlFormatTerm(flag,fieldWidth,precision,pad,"","p") )
            case "o"       => println ( ErlFormatTerm(flag,fieldWidth,      "8", "","","B") )
            case "x"       => println ( ErlFormatTerm(flag,fieldWidth,     "16", "","","B") )
            case "X"       => println ( ErlFormatTerm(flag,fieldWidth,     "16", "","","B") )
            case "f"       => println ( ErlFormatTerm(flag,fieldWidth,precision, "","","f") )
            case "e" | "E" => println ( ErlFormatTerm(flag,fieldWidth,precision, "","","e") )
            case "a" | "A" => println ( ErlFormatTerm(flag,fieldWidth,precision, "","","p") )
            case "g" | "G" => println ( ErlFormatTerm(flag,fieldWidth,precision, "","","g") )
            case "c"       => println ( ErlFormatTerm(flag,fieldWidth,precision,pad,"","c") )
            case "s"       => println ( ErlFormatTerm(flag,fieldWidth,precision,pad,"","s") )
            case "N"       => println ( ErlFormatTerm(flag,fieldWidth,precision, "","","p") )
            case "p"       => println ( ErlFormatTerm(flag,fieldWidth,     "16","0","","B") )
            //case "%"       => 
            case _         => println ( "未対応" )
          }
       }
       case Nil =>
       case _ =>
    }
    ()
  }
}

object ErlFormatTerm{
  // F.P.PadModC
  def apply(flag :String   ,
            termF:String   , 
            termP:String   , 
            termPad:String , 
            termMod:String , 
            termC:String) : String = {
    val tail = termMod+termC
    (termF,termP,termPad) match {
      // fmt0
      case ("" ,"",_)  => "~"+tail
      //
      // fmt1
      case (f  ,"", "") if f != "" => "~" + flag + f + tail
      // fmt2
      case (f  ,"",pad) if f != "" => "~" + flag + f +"."+pad+ tail
      //
      // fmt3
      case ("" , p,  _) if p != "" => "~."+p + tail
      //
      // fmt4
      case (f  , p, "")            => "~"+ flag + f+"."+p        +tail
      // fmt5
      case (f  , p,pad)            => "~"+ flag + f+"."+p+"."+pad+tail
    }
  }
  //
  def unapply(format:String) : Option[(String,String,String,String,String,String)] ={
    if ( format(0) != '~' ) return None
    val reFmt0 = """~([^.\d])""".r                     // ~s
    val reFmt1 = """~(-?)(\d+)([^.\d])""".r              // ~10s , ~-10s
    val reFmt2 = """~(-?)(\d+)\.(.)([^.\d])""".r         // ~10.+s
    val reFmt3 = """~\.(\d+)([^.\d])""".r              // ~.5s
    val reFmt4 = """~(-?)(\d+)\.(\d+)([^.\d])""".r      // ~-10.5s
    val reFmt5 = """~(-?)(\d+)\.(\d+)\.(.)([^.\d])""".r // ~-10.5.+s
    //
    format match {
      case reFmt0(                    termC)      => Some(""  ,   "","",        "","",termC)
      case reFmt1(flag,termF         ,termC)      => Some(flag,termF,"",        "","",termC)
      case reFmt2(flag,termF,termPad ,termC)      => Some(flag,termF,"",   termPad,"",termC)
      case reFmt3(           termP        ,termC) => Some(""  ,   "","",        "","",termC)
      case reFmt4(flag,termF,termP        ,termC) => Some(flag,termF,termP,     "","",termC)
      case reFmt5(flag,termF,termP,termPad,termC) => Some(flag,termF,termP,termPad,"",termC)
      case _ => None
    }
  }
}

object CFormatTerm{
  // %[flags][fieldWidth][.precision]specifier
  def apply(flags:String     , 
            fieldWidth:String, 
            precision:String , 
            specifier:String ) : String = {
    "%"+flags+fieldWidth + {if(precision!="") "."+ precision else ""} +specifier
  }
  //
  def unapply(format:String) : Option[(String,String,String,String)] ={
    if ( format(0) != '%' ) return None
    //
    val reFmt0 = """%([a-zA-Z])""".r
    val reFmt1 = """%([-+ 0#])([\d*]+)([a-zA-Z])""".r
    val reFmt2 = """%([\d*]+)([a-zA-Z])""".r
    val reFmt3 = """%([-+ 0#])([\d*]+)\.([\d*]+)([a-zA-Z])""".r
    val reFmt4 = """%([\d*]+)\.([\d*]+)([a-zA-Z])""".r
    val reFmt5 = """%\.([\d*]+)([a-zA-Z])""".r
    format match {
      case reFmt0(                           specifier) => Some(   "",        "",       "",specifier)
      case reFmt1(flags,fieldWidth,          specifier) => Some(flags,fieldWidth,       "",specifier)
      case reFmt2(      fieldWidth,          specifier) => Some(   "",fieldWidth,       "",specifier)
      case reFmt3(flags,fieldWidth,precision,specifier) => Some(flags,fieldWidth,precision,specifier)
      case reFmt4(      fieldWidth,precision,specifier) => Some(   "",fieldWidth,precision,specifier)
      case reFmt5(                 precision,specifier) => Some(   "",        "",precision,specifier)
      case _ => None
    }
  }
}