diff options
Diffstat (limited to 'fp2/week2/camil/StdIOMonad.icl')
| -rw-r--r-- | fp2/week2/camil/StdIOMonad.icl | 130 |
1 files changed, 0 insertions, 130 deletions
diff --git a/fp2/week2/camil/StdIOMonad.icl b/fp2/week2/camil/StdIOMonad.icl deleted file mode 100644 index c25cb4c..0000000 --- a/fp2/week2/camil/StdIOMonad.icl +++ /dev/null @@ -1,130 +0,0 @@ -implementation module StdIOMonad
-
-import StdBool
-import StdEnum
-import StdFile
-import StdList
-import StdMaybe
-import StdMisc
-import StdMonad
-import StdOverloaded
-import StdString
-import StdTuple
-
-:: IO a = IO (*W -> *(a, *W))
-:: *W :== *(*World, *[*(Filehandle, *File)])
-:: Filemode = Lees | Schrijf
-:: Filenaam :== String
-:: Filehandle :== String
-
-instance toInt Filemode where
- toInt Lees = FReadText
- toInt Schrijf = FWriteText
-
-//voer monadische I/O actie uit op de wereld:
-doIO:: (IO a) *World -> *(a, *W)
-doIO (IO f) w = f (w, [])
-
-unIO:: (IO a) -> *W -> *(a, *W)
-unIO (IO f) = f
-
-// IO is een monad:
-instance return IO where
- return x = IO (\w -> (x, w))
-instance >>= IO where
- (>>=) (IO f) g = IO (\w = let (a, w1) = f w in unIO (g a) w1)
-
-read:: IO String
-read = IO read`
- where
- read`:: *W -> *(String, *W)
- read` (world, s)
- # (io, world) = stdio world
- # (line, io) = freadline io
- # (_, world) = fclose io world
- = (line, (world, s))
-
-// schrijf regel naar de console:
-write :: String -> IO Void
-write s = IO (write` s)
- where
- write`:: String *W -> *(Void, *W)
- write` line (world, s)
- # (io, world) = stdio world
- # io = io <<< line
- # (_, world) = fclose io world
- = (Void, (world, s))
-
-// open de file met gegeven filenaam en mode:
-find:: Filehandle *[*(Filehandle, *File)] -> (Maybe *(Filehandle, *File), *[*(Filehandle, *File)])
-find fh fs
-# (fhs, fis) = unzip fs
-# fhsC = zip2 [0..length fhs] fhs
-# index = [(i, h) \\ (i, h) <- fhsC | h == fh]
-| length index == 0 = (Nothing, zip2 fhs fis)
-# index = fst (hd index)
-# (fis1, fis2) = splitAt index fis
-# (fhs1, fhs2) = splitAt index fhs
-# (thefile, fis2) = splitAt 1 fis2
-# (thehandle, fhs2) = splitAt 1 fhs2
-= (Just (hd thehandle, hd thefile), zip2 (fhs1 ++ fhs2) (fis1 ++ fis2))
-
-
-open:: Filenaam Filemode -> IO (Maybe Filehandle)
-open s m = IO (open` s m)
- where
- open`:: String Filemode *W -> *(Maybe Filehandle, *W)
- open` fp m (world, fs)
- | any (\l = fp == fst l) fs = (Nothing, (world, fs))
- # (ok, file, world) = fopen fp (toInt m) world
- = (Just fp, (world, [(fp, file):fs]))
-
-// sluit de file met gegeven filenaam:
-close:: Filehandle -> IO Bool
-close fh = IO (close` fh)
- where
- close`:: Filehandle *W -> *(Bool, *W)
- close` fp (world, fs)
- # (currentfiletuple, fs) = find fp fs
- | isNothing currentfiletuple = (False, (world, fs))
- # (currentfh, currentfile) = fromJust currentfiletuple
- # (ok, world) = fclose currentfile world
- | not ok = abort "File can't be closed"
- | otherwise = (True, (world, fs))
-
-
-// bepaal of het lezen van de file klaar is:
-eof :: Filehandle -> IO Bool
-eof fh = IO (eof` fh)
- where
- eof`:: Filehandle *W -> *(Bool, *W)
- eof` fp (world, fs)
- # (currentfiletuple, fs) = find fp fs
- | isNothing currentfiletuple = abort "Can't do eof on non-existing file"
- # (currentfh, currentfile) = fromJust currentfiletuple
- # (ok, file) = fend currentfile
- = (ok, (world, [(currentfh, file):fs]))
-
-// lees een regel van een file:
-readline :: Filehandle -> IO (Maybe String)
-readline fh = IO (readline` fh)
- where
- readline` :: Filehandle *W -> *(Maybe String, *W)
- readline` fh (world, fs)
- # (currentfiletuple, fs) = find fh fs
- | isNothing currentfiletuple = (Nothing, (world, fs))
- # (currentfh, currentfile) = fromJust currentfiletuple
- # (s, currentfile) = freadline currentfile
- = (Just s, (world, [(currentfh, currentfile):fs]))
-
-// schrijf een regel naar een file:
-writeline :: String Filehandle -> IO Bool
-writeline s fh = IO (writeline` s fh)
- where
- writeline` :: String Filehandle *W -> *(Bool, *W)
- writeline` s fh (world, fs)
- # (currentfiletuple, fs) = find fh fs
- | isNothing currentfiletuple = (True, (world, fs))
- # (currentfh, currentfile) = fromJust currentfiletuple
- # currentfile = fwrites (s +++ "\n") currentfile
- = (True, (world, [(currentfh, currentfile):fs]))
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