1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
-- Solitaire Simulator 2015
-- ************************
--
-- Start position:
--
-- 123 456 789
--
-- 1 ooo
-- 2 ooo
-- 3 ooo
-- 4 ooo ooo ooo
-- 5 ooo o.o ooo
-- 6 ooo ooo ooo
-- 7 ooo
-- 8 ooo
-- 9 ooo
--
-- Written as an excuse to learn some more Haskell
--
-- {{{ The MIT License (MIT)
--
-- Copyright (c) 2015 Matthias P. Braendli
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in all
-- copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-- SOFTWARE. }}}
import System.IO
import Data.Char
import Debug.Trace
import Control.Monad (ap)
data Direction = North | East | South | West deriving (Eq, Show)
type Row = Int
type Col = Int
type Peg = (Col, Row)
-- A board is defined by what holes are occupied by pegs.
type Pegs = [Peg]
data Board = Board Pegs
-- Board printing stuff
showpeg :: Board -> Row -> Col -> String
showpeg (Board pegs) r c = if (c, r) `elem` pegs then "o" else "."
showrow :: Board -> Row -> String
showrow b r | r <= 3 || r >= 7 = " " ++ foldr (++) "" (map (showpeg b r) [4,5,6]) ++ "\n"
| otherwise = foldr (++) "" (
map (showpeg b r) [1,2,3] ++ [" "] ++
map (showpeg b r) [4,5,6] ++ [" "] ++
map (showpeg b r) [7,8,9] ++ ["\n"] )
instance Show Board where
show board = foldr (++) "" $ map (showrow board) [1..9]
movepeg :: Peg -> Direction -> Peg
movepeg (c, r) dir | dir == North = (c, r-1)
| dir == East = (c+1, r)
| dir == South = (c, r+1)
| dir == West = (c-1, r)
nextpeg :: Board -> Peg -> Direction -> Maybe Peg
nextpeg (Board pegs) peg dir | dir == North && r == 1 = Nothing
| dir == North && r == 4 && (c < 4 || c > 6) = Nothing
| dir == East && c == 9 = Nothing
| dir == East && c == 6 && (r < 4 || r > 6) = Nothing
| dir == South && r == 9 = Nothing
| dir == South && r == 6 && (c < 4 || c > 6) = Nothing
| dir == West && c == 1 = Nothing
| dir == West && c == 4 && (r < 4 || r > 6) = Nothing
| otherwise = --trace ("PEG " ++ show peg ++ " " ++ show dir)
Just $ movepeg peg dir
where (c, r) = peg
-- jump
jumppeg :: Board -> Peg -> Direction -> Maybe Board
jumppeg b peg dir | npeg == Nothing = --trace ("OOB " ++ show peg ++ " " ++ show dir)
Nothing
| npeg2 == Nothing = --trace ("OOB2" ++ show peg ++ " " ++ show dir)
Nothing
-- valid jump: next hole occupied, but the one after is free
| peg `elem` pegs && np `elem` pegs && not (np2 `elem` pegs) = --trace ("OK " ++ show peg ++ " " ++ show dir)
Just $ jumppeg_possible b peg dir
| otherwise = --trace ("Illegal " ++ show peg ++ " " ++ show dir)
Nothing
where npeg = nextpeg b peg dir
Just np = npeg
npeg2 = nextpeg b np dir
Just np2 = npeg2
Board pegs = b
jumppeg_possible :: Board -> Peg -> Direction -> Board
jumppeg_possible (Board pegs) peg dir = Board (removepeg ++ [npeg2])
where removepeg = filter ((/=) peg) $ -- remove jumping peg from origin
filter ((/=) npeg) pegs -- remove peg being jumped over
npeg = movepeg peg dir
npeg2 = movepeg npeg dir
testboard = Board [(4,1), (5,1), (4,2), (6,1)]
data Move = Move Peg Direction Board
instance Show Move where
show (Move peg dir b) = "Move " ++ show peg ++ " " ++ show dir ++ " gives\n" ++ show b
try_move :: Board -> Peg -> Direction -> Maybe Move
try_move b peg dir = fmap (Move peg dir) brd
where brd = jumppeg b peg dir
Just newboard = brd
allmoves :: Board -> [Move]
allmoves board = [x | Just x <- maybeboards]
where all_dirs = [North, West, South, East]
Board pegs = board
maybeboards = [try_move board p d | p <- pegs, d <- all_dirs]
pr board = putStrLn ("Welcome!\n From board\n" ++ show board ++ "\nIt is possible to do\n" ++ unlines (map show $ allmoves board))
testmove = Move (0,0) North testboard
|
