code/Sokoban.icl

   1 implementation module Sokoban
   2
   3 import StdFile
   4 import StdList
   5 import StdString
   6 import StdMisc
   7
   8 Start :: *World -> (String, *World)
   9 Start w
  10 # (s, w) = parse "../sokobanzip/screens/screen.1" w
  11 = ("\n" +++ toString s, w)
  12
  13 instance toString SokobanPuzzle where
  14         toString (Sokoban []) = ""
  15         toString (Sokoban [[]:rows]) = "\n" +++ toString (Sokoban rows)
  16         toString (Sokoban [[x:xs]:rows]) =
  17                 toString x +++ toString (Sokoban [xs:rows])
  18
  19 instance toString SokobanTile where
  20         toString Free = " "
  21         toString Wall = "#"
  22         toString Box = "$"
  23         toString Agent = "@"
  24         toString Target = "."
  25
  26 parse :: String *World -> (SokobanPuzzle, *World)
  27 parse fp w
  28 # (ok, f, w) = fopen fp FReadText w
  29 | not ok = abort ("Couldn't open file: '" +++ fp +++ "'")
  30 # (contents, f) = readEntireFile f
  31 | isEmpty contents = abort "File is empty or unreadable"
  32 # (ok, w) = fclose f w
  33 | not ok = abort "Couldn't close file"
  34 = (Sokoban (parseRows contents), w)
  35
  36 parseRows :: [Char] -> [[SokobanTile]]
  37 parseRows cs = case parseRow cs of
  38         ([], _) = []
  39         (x, rest) = [x:parseRows rest]
  40
  41 parseRow :: [Char] -> ([SokobanTile], [Char])
  42 parseRow [] = ([], [])
  43 parseRow ['\n':xs] = ([], xs)
  44 parseRow [x:xs]
  45 # (rest, xs) = parseRow xs
  46 # current = case x of
  47         '#' = Wall
  48         '$' = Box
  49         '@' = Agent
  50         '.' = Target
  51         ' ' = Free
  52         _ = abort ("Unknown char: '" +++ toString x +++ "'")
  53 = ([current:rest], xs)
  54
  55 readEntireFile :: *File -> *([Char], *File)
  56 readEntireFile f
  57 # (b, c, f) = freadc f
  58 | not b = ([], f)
  59 # (cs, f) = readEntireFile f
  60 = ([c:cs], f)