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Diffstat (limited to 'src/Trammel.hs')
| -rw-r--r-- | src/Trammel.hs | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/src/Trammel.hs b/src/Trammel.hs deleted file mode 100644 index 36c1140..0000000 --- a/src/Trammel.hs +++ /dev/null @@ -1,216 +0,0 @@ -{-# LANGUAGE GeneralizedNewtypeDeriving #-} -{-# LANGUAGE FlexibleInstances #-} -{-# LANGUAGE TypeFamilies #-} -{-# LANGUAGE OverloadedLists #-} -{-# LANGUAGE OverloadedStrings #-} -{-# LANGUAGE RecordWildCards #-} -module Trammel where - -import Control.Applicative -import Data.List -import Data.String -import Data.Monoid -import Data.Ix (inRange) - -type Ps = Int -type Pm = [Ps] - -data Trammel a - = Plain a - | SGR Pm (Trammel a) - | Append (Trammel a) (Trammel a) - | Empty - deriving (Eq, Show) - - -instance Monoid (Trammel a) where - mappend = Append - mempty = Empty - - -instance IsString a => IsString (Trammel a) where - fromString = Plain . fromString - - -class IsPm a where - toPm :: a -> Pm - fromPm :: Pm -> Maybe a - - -data FColor = ECMA48FColor Ps -- ECMA-48 / ISO 6429 / ANSI X3.64 - | Xterm256FColor Ps - | ISO8613_3FColor Ps Ps Ps - deriving (Eq, Show) - -instance IsPm FColor where - toPm (ECMA48FColor i) = [i] - toPm (Xterm256FColor i) = [38,5,i] - toPm (ISO8613_3FColor r g b) = [38,2,r,g,b] - fromPm = fromSGRPm SGRPm - { def8Ps = 39 - , extPs = 38 - , lo8Ps = 30 - , hi8Ps = 37 - , makeECMA48Color = ECMA48FColor - , makeXterm256Color = Xterm256FColor - , makeISO8613_3Color = ISO8613_3FColor - } - . filterPm sgrBColor - - -data BColor = ECMA48BColor Ps - | Xterm256BColor Ps - | ISO8613_3BColor Ps Ps Ps - deriving (Eq, Show) - - -instance IsPm BColor where - toPm (ECMA48BColor i) = [i] - toPm (Xterm256BColor i) = [48,5,i] - toPm (ISO8613_3BColor r g b) = [48,2,r,g,b] - fromPm = fromSGRPm SGRPm - { def8Ps = 49 - , extPs = 48 - , lo8Ps = 40 - , hi8Ps = 47 - , makeECMA48Color = ECMA48BColor - , makeXterm256Color = Xterm256BColor - , makeISO8613_3Color = ISO8613_3BColor - } - . filterPm sgrFColor - - -data Bold = Bold | NoBold - deriving (Eq, Show) - -instance IsPm Bold where - toPm Bold = [1] - toPm NoBold = [22] - fromPm = rec . filterPm sgrColor - where - rec xs = case filter (`elem`[1,22]) xs of - [] -> Nothing - xs' -> case last xs' of - 1 -> Just Bold - 22 -> Just NoBold - _ -> error "filter broken in fromPm :: Pm -> Maybe Bold" - - -data Underline = Underline | NoUnderline - deriving (Eq, Show) - -instance IsPm Underline where - toPm Underline = [4] - toPm NoUnderline = [24] - fromPm = rec . filterPm sgrColor - where - rec xs = case filter (`elem`[4,24]) xs of - [] -> Nothing - xs' -> case last xs' of - 1 -> Just Underline - 22 -> Just NoUnderline - _ -> error "filter broken in fromPm :: Pm -> Maybe Underline" - - -data SGRPm c = SGRPm - { def8Ps :: Ps - , extPs :: Ps - , lo8Ps :: Ps - , hi8Ps :: Ps - , makeECMA48Color :: Ps -> c - , makeXterm256Color :: Ps -> c - , makeISO8613_3Color :: Ps -> Ps -> Ps -> c - } - - -fromSGRPm :: IsPm c => SGRPm c -> Pm -> Maybe c -fromSGRPm SGRPm{..} = rec Nothing - where - rec mb_c (x:xs) - | x == extPs = case xs of - (2:r:g:b:xs') -> rec (Just $ makeISO8613_3Color r g b) xs' - (5:i:xs') -> rec (Just $ makeXterm256Color i) xs' - _ -> rec mb_c xs - | x == def8Ps = rec (Just $ makeECMA48Color def8Ps) xs - | inRange (lo8Ps, hi8Ps) x = rec (Just $ makeECMA48Color x) xs - | otherwise = rec mb_c xs - rec mb_c _ = mb_c - - --- filterPm is used to preprocess Pm before searching with fromPm in --- order to remove (longer) sequences that could contain subsequences --- that look like the (shorter) sequences we're searching. --- E.g. we could find [1] (bold) in any extended color sequence. --- TODO Can we combine this whole from*Pm with Scanner? -filterPm :: (Pm -> Maybe Int) -> Pm -> Pm -filterPm f = rec [] - where - rec ys xs@(xhead:xtail) = maybe (rec (ys ++ [xhead]) xtail) - (rec ys . flip drop xs) - (f xs) - rec ys _ = ys - -sgrColor, sgrFColor, sgrBColor :: Pm -> Maybe Int - -sgrColor xs = sgrFColor xs <|> sgrBColor xs - -sgrFColor (38:5:_) = Just 3 -sgrFColor (38:2:_) = Just 5 -sgrFColor _ = Nothing - -sgrBColor (48:5:_) = Just 3 -sgrBColor (48:2:_) = Just 5 -sgrBColor _ = Nothing - - -type RenderState = [(FColor, BColor, Bold, Underline)] - - -emptyRenderState :: RenderState -emptyRenderState = [(ECMA48FColor 39, ECMA48BColor 49, NoBold, NoUnderline)] - -renderString :: RenderState -> Trammel String -> String -> String - -renderString _ (Plain s) y = s ++ y - --- TODO merge successive sequences: \ESC[32m\ESC[1m -> \ESC[31;1m -renderString rs@((fc, bc, b, u):_) (SGR c t) y = - renderSGR bra ++ renderString rs' t (renderSGR ket ++ y) - where - fc' = maybe fc id $ fromPm c - bc' = maybe bc id $ fromPm c - b' = maybe b id $ fromPm c - u' = maybe u id $ fromPm c - rs' = (fc', bc', b', u') : rs - bra = braket >>= fst - ket = braket >>= snd - braket = - (if fc' /= fc then (toPm fc', toPm fc) else ([],[])) : - (if bc' /= bc then (toPm bc', toPm bc) else ([],[])) : - (if b' /= b then (toPm b', toPm b) else ([],[])) : - (if u' /= u then (toPm u', toPm u) else ([],[])) : [] - -renderString _ (SGR _ _) _ = - error "renderString called w/o proper initial state" - -- where a proper initial state is s.th. like emptyRenderState - -renderString r (Append t1 t2) y = - renderString r t1 $ renderString r t2 y - -renderString _ Empty y = y - - -len :: Trammel String -> Int -len (Plain x) = length x -len (SGR _ x) = len x -len (Append t1 t2) = len t1 + len t2 -len Empty = 0 - - -pp :: Trammel String -> String -pp t = renderString emptyRenderState t "" - - -renderSGR :: Pm -> String -renderSGR [] = [] -renderSGR xs = ("\ESC["++) . (++"m") . intercalate ";" $ map show xs |