1 

     2 import scala.concurrent._

     3 import scala.concurrent.duration._

     4 import ExecutionContext.Implicits.global

     5 import scala.language.postfixOps 

     6 import scala.language.reflectiveCalls

     7 

     8 

     9 

    10 lazy val f = Future {

    11   import CW8a._

    12 

    13   val EVIL_urban = SEQ(STAR(STAR(CHAR('a'))), CHAR('b'))

    14 

    15   //println("1")

    16   assert(ders(List.fill(5)('a'), EVIL_urban) == SEQ(SEQ(STAR(CHAR('a')),STAR(STAR(CHAR('a')))),CHAR('b')))

    17   //println("2")

    18   assert(ders(List('b'), EVIL_urban) == ONE)

    19   //println("3")

    20   assert(ders(List('b','b'), EVIL_urban) == ZERO)

    21   //println("4")

    22   assert(matcher(EVIL_urban, "a" * 5 ++ "b") == true)

    23   //println("5")

    24   assert(matcher(EVIL_urban, "b") == true)

    25   //println("6") 

    26   assert(matcher(EVIL_urban, "bb") == false)

    27   //println("7")

    28   assert(matcher("abc", "abc") == true)

    29   //println("8")

    30   assert(matcher(("ab" | "a") ~ (ONE | "bc"), "abc") == true)

    31   //println("9")

    32   assert(matcher(ONE, "") == true)

    33   //println("10")

    34   assert(matcher(ZERO, "") == false)

    35   //println("11")

    36   assert(matcher(ONE | CHAR('a'), "") == true)

    37   //println("12")

    38   assert(matcher(ONE | CHAR('a'), "a") == true)

    39 }

    40 

    41 Await.result(f, 90 second)