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(* Copyright (C) 2017-2018 Ryan Kavanagh <rkavanagh@cs.cmu.edu> *)
(* Distributed under the ISC license, see COPYING for details. *)
(* This is a hypothetical assignment where students have to *)
(* implement addition. There are two Autolab problems testing *)
(* their implementation on "easy" and "hard" pairs of input. *)
(* The scoreboard just keeps track of how many bonuses problems *)
(* their implementation solves. *)
(* Because addition can be very lengthy, we timeout the execution *)
(* after a fixed amount of time. *)
functor ChecksHelper (structure H : HELPER) : CHECKS where type checks = H.checks =
struct
datatype checks = datatype H.checks
(*****************************************************)
(********** CONFIGURE ME HERE *******)
(*****************************************************)
structure Student : ADDER = Adder
(* Run function f with arguments a with timeout of n seconds. *)
fun try n f a = Timeout.runWithTimeout (Time.fromSeconds n) f a
(* test data is of the form *)
(* ("autolab exercise name", maxScore, [(input,expected),...]) *)
val testSums = [("easy", 4, [((1,1),2), ((1,2),3), ((2,2),4), ((3,5),8)]),
("hard", 8, [((152,203),355), ((1212,2121),3333)])]
(* Bonus problems that get used for score board *)
val bonusSums = [((10,~10),0)]
(* Pretty print problem input *)
fun inputToString (x,y) = (Int.toString x) ^ " + " ^ (Int.toString y)
(* Compare student output to expected output with a timeout, and *)
(* compute the % of correct answers. *)
fun compare tests =
let fun c (input,expected) =
let val testStr = inputToString input in
case try 10 Student.add input of
(* No timeout *)
SOME b => if b = expected then
( H.printLn ("Passed: " ^ testStr)
; (1, 0))
else
( H.printLn ("Failed: " ^ testStr)
; H.printLn (" Expected "
^ (Int.toString expected)
^ " but got " ^ (Int.toString b))
; (0, 1) )
| NONE => ( H.printLn ("Timed out after 10s on " ^ testStr)
; (0, 1))
end
fun addp (a, b) (c, d) = (a + c, b + d)
val (same,diff) = List.foldl (fn (p,acc) => addp (c p) acc)
(0, 0)
tests
in real same / real (same + diff) end
val checks = List.map (fn (name,max,tests) =>
H.Problem (name, fn _ => real max * compare tests))
testSums
fun scoreboard score =
( H.printLn "Checking bonuses..."
; SOME [List.foldl
(fn ((p,b),acc) =>
if try 2 Student.add p = SOME b then
( H.printLn ("Got bonus " ^ (inputToString p))
; H.printLn ("Well done!")
; acc + 1
)
else
( H.printLn ("Failed to add bonus " ^ (inputToString p))
; H.printLn ("in under 2 seconds. Skipping.")
; acc
)
)
0
bonusSums] )
(*****************************************************)
(********** END CONFIGURATION *******)
(*****************************************************)
end
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