[WIP] Implement exercise bowling

config.json

@@ -66,6 +66,18 @@
         "transforming"
       ]
     },
+    {
+      "uuid": "ca970fee-71b4-41e1-a5c3-b23bf574eb33",
+      "slug": "bowling",
+      "core": false,
+      "unlocked_by": null,
+      "difficulty": 5,
+      "topics": [
+        "classes",
+        "exception_handling",
+        "logic"
+      ]
+    },
     {
       "uuid": "8648fa0c-d85f-471b-a3ae-0f8c05222c89",
       "slug": "hamming",

exercises/bowling/bowling.py

@@ -0,0 +1,11 @@
+
+
+class BowlingGame(object):
+    def __init__(self):
+        pass
+
+    def roll(self, pins):
+        pass
+
+    def score(self):
+        pass

exercises/bowling/bowling_test.py

@@ -0,0 +1,192 @@
+# Tests adapted from `problem-specifications//canonical-data.json` @ v1.0.1
+import unittest
+
+from bowling import BowlingGame
+
+
+class BowlingTests(unittest.TestCase):
+    def setUp(self):
+        self.game = BowlingGame()
+
+    def roll(self, rolls):
+        [self.game.roll(roll) for roll in rolls]
+
+    def roll_and_score(self, rolls):
+        self.roll(rolls)
+        return self.game.score()
+
+    def test_should_be_able_to_score_a_game_with_all_zeros(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 0)
+
+    def test_should_be_able_to_score_a_game_with_no_strikes_or_spares(self):
+        rolls = [3, 6, 3, 6, 3, 6, 3, 6, 3, 6, 3, 6, 3, 6, 3, 6, 3, 6, 3, 6]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 90)
+
+    def test_a_spare_follow_by_zeros_is_worth_ten_points(self):
+        rolls = [6, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 10)
+
+    def test_points_scored_in_the_roll_after_a_spare_are_counted_twice(self):
+        rolls = [6, 4, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 16)
+
+    def test_consecutive_spares_each_get_a_one_roll_bonus(self):
+        rolls = [5, 5, 3, 7, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 31)
+
+    def test_last_frame_spare_gets_bonus_roll_that_is_counted_twice(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 3, 7]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 17)
+
+    def test_a_strike_earns_ten_points_in_a_frame_with_a_single_roll(self):
+        rolls = [10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 10)
+
+    def test_two_rolls_points_after_strike_are_counted_twice(self):
+        rolls = [10, 5, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 26)
+
+    def test_consecutive_stikes_each_get_the_two_roll_bonus(self):
+        rolls = [10, 10, 10, 5, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 81)
+
+    def test_strike_in_last_frame_gets_two_roll_bonus_counted_once(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                 10, 7, 1]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 18)
+
+    def test_rolling_spare_with_bonus_roll_does_not_get_bonus(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+                 0, 10, 7, 3]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 20)
+
+    def test_strikes_with_the_two_bonus_rolls_do_not_get_bonus_rolls(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10,
+                 10, 10]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 30)
+
+    def test_strike_with_bonus_after_spare_in_last_frame_gets_no_bonus(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7,
+                 3, 10]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 20)
+
+    def test_all_strikes_is_a_perfect_game(self):
+        rolls = [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 300)
+
+    def test_rolls_cannot_score_negative_points(self):
+
+        self.assertRaises(ValueError, self.game.roll, -11)
+
+    def test_a_roll_cannot_score_more_than_10_points(self):
+
+        self.assertRaises(ValueError, self.game.roll, 11)
+
+    def test_two_rolls_in_a_frame_cannot_score_more_than_10_points(self):
+        self.game.roll(5)
+
+        self.assertRaises(ValueError, self.game.roll, 6)
+
+    def test_bonus_after_strike_in_last_frame_cannot_score_more_than_10(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10]
+
+        self.roll(rolls)
+
+        self.assertRaises(ValueError, self.game.roll, 11)
+
+    def test_bonus_aft_last_frame_strk_can_be_more_than_10_if_1_is_strk(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10,
+                 10, 6]
+
+        score = self.roll_and_score(rolls)
+
+        self.assertEqual(score, 26)
+
+    def test_bonus_aft_last_frame_strk_cnt_be_strk_if_first_is_not_strk(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 6]
+
+        self.roll(rolls)
+
+        self.assertRaises(ValueError, self.game.roll, 10)
+
+    def test_an_incomplete_game_cannot_be_scored(self):
+        rolls = [0, 0]
+
+        self.roll(rolls)
+
+        self.assertRaises(IndexError, self.game.score)
+
+    def test_cannot_roll_if_there_are_already_ten_frames(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
+
+        self.roll(rolls)
+
+        self.assertRaises(IndexError, self.game.roll, 0)
+
+    def test_bonus_rolls_for_strike_must_be_rolled_before_score_is_calc(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10]
+
+        self.roll(rolls)
+
+        self.assertRaises(IndexError, self.game.score)
+
+    def test_both_bonuses_for_strike_must_be_rolled_before_score(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10, 10]
+
+        self.roll(rolls)
+
+        self.assertRaises(IndexError, self.game.score)
+
+    def test_bonus_rolls_for_spare_must_be_rolled_before_score_is_calc(self):
+        rolls = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 3]
+
+        self.roll(rolls)
+
+        self.assertRaises(IndexError, self.game.score)
+
+
+if __name__ == '__main__':
+    unittest.main()

exercises/bowling/example.py

@@ -0,0 +1,149 @@
+MAX_PINS = 10
+NUM_FRAMES = 10
+
+
+class BowlingGame(object):
+    """This class manages the Bowling Game including the roll and score
+    methods"""
+    def __init__(self):
+        self.rolls = []
+        self.totalScore = 0
+        self.currentFrame = Frame()
+        self.bonusRollsAccrued = 0
+        self.bonusRollsSeen = 0
+
+    def roll(self, pins):
+        if self.isBonusRoll():
+            self.bonusRollsSeen += 1
+
+        # is the second roll valid based off the first?
+        if (self.currentFrame.isOpen() and
+           self.currentFrame.getFrame()[0] is not None):
+            if self.currentFrame.getFrame()[0] + pins > MAX_PINS:
+                raise ValueError("This roll will cause the current frame  "
+                                 "to be getter than the max number of pins")
+
+        # open a new frame if the last one has been closed
+        if not self.currentFrame.isOpen():
+            self.currentFrame = Frame()
+
+        # valid roll between 0-10
+        if pins in range(MAX_PINS + 1):
+            # raise an error if the game is over and they try to roll again
+            if ((len(self.rolls) == NUM_FRAMES) and
+               self.bonusRollsAccrued == 0):
+                raise IndexError("Max Frames have been reached.  Too many "
+                                 "rolls")
+            else:
+                self.currentFrame.roll(pins,
+                                       self.isBonusRoll(),
+                                       self.bonusRollsAccrued,
+                                       self.bonusRollsSeen)
+                # if we closed it add it to our rolls
+                if not self.currentFrame.isOpen():
+                    self.rolls.append(self.currentFrame)
+                    # If this is the last frame did we earn any bonus rolls?
+                    if len(self.rolls) == NUM_FRAMES:
+                        self.bonusRollsEarned()
+        else:
+            raise ValueError("Amount of pins rolled is greater than the max "
+                             "number of pins")
+
+    def score(self):
+        frame_index = 0
+
+        while (frame_index <= NUM_FRAMES-1):
+            frame = self.rolls[frame_index].getFrame()
+
+            roll1 = frame[0]
+            roll2 = frame[1]
+
+            if self.isStrike(roll1):
+                self.totalScore += roll1 + self.stikeBonus(frame_index)
+            else:
+                if self.isSpare(roll1, roll2):
+                    self.totalScore += roll1 + roll2 + \
+                                       self.spareBonus(frame_index)
+                else:
+                    self.totalScore += roll1 + roll2
+
+            frame_index += 1
+
+        return self.totalScore
+
+    def isStrike(self, pins):
+        return True if pins == MAX_PINS else False
+
+    def isSpare(self, roll1, roll2):
+        return True if roll1 + roll2 == MAX_PINS else False
+
+    def stikeBonus(self, frame_index):
+        bonusroll1 = self.rolls[frame_index+1].getFrame()[0]
+        bonusroll2 = 0
+        # need to go further out if the next on is a strike
+        if bonusroll1 == 10:
+            bonusroll2 = self.rolls[frame_index+2].getFrame()[0]
+        else:
+            bonusroll2 = self.rolls[frame_index+1].getFrame()[1]
+        # edge case - if the last roll is a stike the bonus rolls needs to be
+        # validated
+        if (not self.isStrike(bonusroll1) and
+           (bonusroll1 + bonusroll2 > MAX_PINS)):
+            raise ValueError("The bonus rolls total to greater than the max "
+                             "number of pins")
+        else:
+            return bonusroll1 + bonusroll2
+
+    def spareBonus(self, frame_index):
+        return self.rolls[frame_index+1].getFrame()[0]
+
+    def isLastFrame(self, frame_index):
+        return True if frame_index >= len(self.rolls)-1 else False
+
+    def bonusRollsEarned(self):
+        if len(self.rolls) == NUM_FRAMES:
+            lastFrame = self.rolls[NUM_FRAMES-1].getFrame()
+            if self.isStrike(lastFrame[0]):
+                self.bonusRollsAccrued = 2
+            elif self.isSpare(lastFrame[0], lastFrame[1]):
+                self.bonusRollsAccrued = 1
+        else:
+            self.bonusRollsAccrued = 0
+        return
+
+    def isBonusRoll(self):
+        # if we've already seen all
+        return True if len(self.rolls) >= NUM_FRAMES else False
+
+
+class Frame(object):
+    """This class is for internal use only.  It divides up the array of
+    rolls into Frame objects"""
+    def __init__(self):
+        self.rolls = [None, None]
+        self.open = True
+
+    def roll(self, roll, bonusRoll, accruedBonuses, seenBonuses):
+        # if it's a strike we close the frame
+        if roll == 10:
+            self.rolls[0] = 10
+            self.rolls[1] = 0
+            self.open = False
+        else:
+            # first roll, but frame is still open
+            if self.rolls[0] is None:
+                self.rolls[0] = roll
+                # may need to close bonus roll frames before 2 have been seen
+                if bonusRoll and seenBonuses == accruedBonuses:
+                    self.rolls[1] = 0
+                    self.open = False
+            else:
+                # second roll, closes frame
+                self.rolls[1] = roll
+                self.open = False
+
+    def isOpen(self):
+        return self.open
+
+    def getFrame(self):
+        return self.rolls