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|
{-# LANGUAGE LambdaCase #-}
module Scanner
( scan
, Scan(..)
) where
import Data.Bits ((.&.), testBit)
import Data.Char (ord)
import System.IO (Handle, hGetChar, hLookAhead, hWaitForInput)
timeout :: Int
timeout = 1
data Scan =
ScanKey String
| ScanMouse
{ mouseButton :: Int
, mousePressed :: Bool -- True == pressed, False == released
, mouseShift :: Bool
, mouseMeta :: Bool
, mouseControl :: Bool
, mouseMotion :: Bool
, mouseX :: Int
, mouseY :: Int
}
deriving Show
scan :: Handle -> IO Scan
scan h =
hGetChar h >>= \case
'\ESC' -> scanESC h
c -> return $ ScanKey [c]
scanESC :: Handle -> IO Scan
scanESC h =
hWaitGetChar timeout h >>= \case
Nothing -> return $ ScanKey "\ESC"
Just c
| c == '[' -> -- 05/11
scanCS h
| c == '\ESC' -> -- 01/11
-- XXX M-F1 and other crazy chords may cause
-- \ESC\ESC... on wu, so we just recurse here...
scanESC h
| c == 'O' -> -- 04/15
-- XXX Non-CSI SS3
-- XXX finalByte is maybe calles somehow else here, but it's
-- the same range
one h finalByte ['O','\ESC'] >>=
return . ScanKey . reverse
| otherwise ->
return $ ScanKey ['\ESC',c]
scanCS :: Handle -> IO Scan
scanCS h =
hWaitLookAhead timeout h >>= \case
Nothing -> return $ ScanKey "\ESC" -- TODO move this to scanESC
Just c
| c == '<' -> hGetChar h >> scanSGRMousePayload h
| c == 'M' -> hGetChar h >> scanX10MousePayload h
| otherwise -> scanOtherCSISequence h
scanX10MousePayload :: Handle -> IO Scan
scanX10MousePayload h = do
b <- ord <$> hGetChar h
x <- ord <$> hGetChar h
y <- ord <$> hGetChar h
let pressed = (b .&. 3) /= 3
return (decodeMouseEvent (b - 32) (x - 32) (y - 32) pressed)
scanSGRMousePayload :: Handle -> IO Scan
scanSGRMousePayload h = do
b <- scanNumber h
_ <- expectChar h (==';')
x <- scanNumber h
_ <- expectChar h (==';')
y <- scanNumber h
m <- hGetChar h -- 'M' or 'm'
let pressed = (m == 'M')
return (decodeMouseEvent b x y pressed)
scanOtherCSISequence :: Handle -> IO Scan
scanOtherCSISequence h = do
params <- zeroOrMore h parameterByte ['[', '\ESC']
inters <- zeroOrMore h intermediateByte params
final <- expectChar h finalByte
return (ScanKey (reverse (final : inters)))
scanNumber :: Handle -> IO Int
scanNumber h = go 0
where
go acc =
hWaitLookAhead timeout h >>= \case
Just c ->
if '0' <= c && c <= '9'
then hGetChar h >> go (acc * 10 + (ord c - ord '0'))
else return acc
Nothing -> fail "timeout"
zeroOrMore :: Handle -> (Char -> Bool) -> [Char] -> IO [Char]
zeroOrMore h p buf =
hWaitLookAhead timeout h >>= \case
Nothing -> return buf
Just c
| p c ->
hGetChar h {-drop c-} >> zeroOrMore h p (c:buf)
| otherwise ->
return buf
one :: Handle -> (Char -> Bool) -> [Char] -> IO [Char]
one h p buf =
expectChar h p >>= \c -> return (c : buf)
expectChar :: Handle -> (Char -> Bool) -> IO Char
expectChar h p =
hWaitGetChar timeout h >>= \case
Just c ->
if p c
then return c
else fail ("unexpected char: " ++ show c)
Nothing ->
fail "timeout"
parameterByte :: Char -> Bool
parameterByte = between '0' '?' -- 03/00 03/15
intermediateByte :: Char -> Bool
intermediateByte = between ' ' '/' -- 02/00 02/15
finalByte :: Char -> Bool
finalByte = between '@' '~' -- 04/00 07/14
between :: Ord a => a -> a -> (a -> Bool)
between lo hi = \ x -> lo <= x && x <= hi
hWaitGetChar :: Int -> Handle -> IO (Maybe Char)
hWaitGetChar t h = do
ready <- hWaitForInput h t
if ready
then hGetChar h >>= return . Just
else return Nothing
hWaitLookAhead :: Int -> Handle -> IO (Maybe Char)
hWaitLookAhead t h = do
ready <- hWaitForInput h t
if ready
then hLookAhead h >>= return . Just
else return Nothing
decodeMouseEvent :: Int -> Int -> Int -> Bool -> Scan
decodeMouseEvent b x y pressed =
let
button = case (b .&. 3) + (b .&. 64) of
0 -> 1
1 -> 2
2 -> 3
64 -> 4 -- wheel up
65 -> 5 -- wheel down
66 -> 6 -- wheel left
67 -> 7 -- wheel right
3 -> 0 -- X10 release
btn -> error $ "TODO proper parseNormalButton error: " ++ show btn
in
ScanMouse
{ mouseButton = button
, mousePressed = pressed
, mouseShift = testBit b 2
, mouseMeta = testBit b 3
, mouseControl = testBit b 4
, mouseMotion = testBit b 5
, mouseX = x
, mouseY = y
}
|
