From 3493421d404c7b7b1383a7b69f473b9e593f5eb4 Mon Sep 17 00:00:00 2001 From: tv Date: Sat, 27 Dec 2014 22:58:35 +0100 Subject: import Scanner & Trammel from hack 505e832 --- Trammel.hs | 216 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 216 insertions(+) create mode 100644 Trammel.hs (limited to 'Trammel.hs') diff --git a/Trammel.hs b/Trammel.hs new file mode 100644 index 0000000..36c1140 --- /dev/null +++ b/Trammel.hs @@ -0,0 +1,216 @@ +{-# 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 -- cgit v1.2.3