afp/a5/a5.icl

   1 module a5
   2
   3 import Data.List
   4 import Data.Func
   5 import Text
   6
   7 import iTasks
   8
   9 derive class iTask Function, Question
  10 :: Function = Student | Teacher | Admin
  11 :: Question =
  12         { question :: String
  13         , answers  :: [String]
  14         , correct  :: Int
  15         }
  16
  17 questions :: Shared [Question]
  18 questions = sharedStore "questions"
  19         [{question="Afp cool?"
  20          ,answers=["yes", "no"]
  21          ,correct=0}
  22         ,{question="Mart the awesomest TA?"
  23          ,answers=["yes", "no"]
  24          ,correct=0}
  25         ]
  26
  27 Start w = doTasks login w
  28
  29 login :: Task [Question]
  30 login = enterInformation "Enter your function" []
  31         >>= \function->case function of
  32                 Teacher = teacher
  33                 Admin = admin
  34                 Student = student
  35
  36 student :: Task [Question]
  37 student = get questions
  38         >>= \qs->sequence (map makeQuestion qs) @ distillResult
  39         >>= viewInformation "Result" []
  40         >>* [OnAction (Action "Quit") (always login)]
  41 where
  42         makeQuestion :: Question -> Task Bool
  43         makeQuestion q = enterChoice q.question [ChooseFromList snd] (zip2 [0..] q.answers)
  44                 @? \v->case v of
  45                         NoValue = NoValue
  46                         Value (idx, _) _ = Value (idx == q.correct) True
  47
  48         distillResult :: [Bool] -> String
  49         distillResult [] = "No questions answered!"
  50         distillResult b = concat
  51                 [ "You had "
  52                 , toString good
  53                 , " answers correct and "
  54                 , toString bad
  55                 , " answers incorrect which results in a score of: "
  56                 , toString $ good*100 / (good+bad)
  57                 , "/100"
  58                 ]
  59         where
  60                 good = length [()\\True<-b]
  61                 bad = length [()\\False<-b]
  62
  63 admin :: Task [Question]
  64 admin = updateSharedInformation "Questions" [] questions
  65
  66 teacher :: Task [Question]
  67 teacher = forever
  68         $     enterChoiceWithShared "Choose an item to edit" [ChooseFromList id] questions
  69         >>*
  70                 [ OnAction (Action "Append") (withValue $ Just o append)
  71                 , OnAction (Action "Delete") (withValue $ Just o delete)
  72                 , OnAction (Action "Edit")   (withValue $ Just o edit)
  73                 , OnAction (Action "Clear")  (withValue $ Just o clear)
  74                 , OnAction (Action "First")  (always first)
  75                 , OnAction (Action "Quit")   (always login)
  76                 ]
  77 where
  78         append choice = orCancel (enterInformation () []) \nq->upd (insertAfter choice nq) questions
  79         delete choice = upd (deleteBy (===) choice) questions
  80         edit choice   = orCancel (updateInformation () [] choice) $ replace choice
  81         clear choice  = orCancel (enterInformation () []) $ replace choice
  82         first         = orCancel (enterInformation () []) \nq->upd (\x->[nq:x]) questions
  83
  84         replace choice nq = upd (deleteBy (===) choice o insertAfter choice nq) questions
  85
  86         insertAfter :: a a [a] -> [a] | gEq{|*|} a
  87         insertAfter after el [] = [el]
  88         insertAfter after el [e:es]
  89                 | e === after = [e,el:es]
  90                 = insertAfter after el es
  91
  92         orCancel do done = do >>*
  93                 [ OnAction (Action "Cancel") (always teacher)
  94                 , OnAction (Action "Continue") (withValue (Just o done))
  95                 ]