forked from GitHub/gf-core
92 lines
3.1 KiB
Haskell
92 lines
3.1 KiB
Haskell
module Text where
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import Operations
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import Char
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-- elementary text postprocessing. AR 21/11/2001
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-- This is very primitive indeed. The functions should work on
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-- token lists and not on strings. AR 5/12/2002
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-- XML hack 14/8/2004; not in use yet
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-- does not apply untokenizer within XML tags --- heuristic "< "
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-- this function is applied from top level...
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untokWithXML :: (String -> String) -> String -> String
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untokWithXML unt s = case s of
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'<':cs@(c:_) | isAlpha c -> '<':beg ++ ">" ++ unto (drop 1 rest) where
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(beg,rest) = span (/='>') cs
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'<':cs -> '<':unto cs ---
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[] -> []
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_ -> unt beg ++ unto rest where
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(beg,rest) = span (/='<') s
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where
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unto = untokWithXML unt
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-- ... whereas this one is embedded on a branch
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exceptXML :: (String -> String) -> String -> String
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exceptXML unt s = '<':beg ++ ">" ++ unt (drop 1 rest) where
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(beg,rest) = span (/='>') s
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formatAsTextLit :: String -> String
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formatAsTextLit = formatAsText . unwords . map unStringLit . words
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--- hope that there will be deforestation...
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formatAsCodeLit :: String -> String
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formatAsCodeLit = formatAsCode . unwords . map unStringLit . words
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formatAsText :: String -> String
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formatAsText = unwords . format . cap . words where
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format ws = case ws of
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w : c : ww | major c -> (w ++ c) : format (cap ww)
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w : c : ww | minor c -> (w ++ c) : format ww
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c : ww | para c -> "\n\n" : format ww
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w : ww -> w : format ww
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[] -> []
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cap (p:(c:cs):ww) | para p = p : (toUpper c : cs) : ww
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cap ((c:cs):ww) = (toUpper c : cs) : ww
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cap [] = []
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major = flip elem (map singleton ".!?")
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minor = flip elem (map singleton ",:;")
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para = (=="<p>")
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formatAsCode :: String -> String
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formatAsCode = rend 0 . words where
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-- render from BNF Converter
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rend i ss = case ss of
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"[" :ts -> cons "[" $ rend i ts
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"(" :ts -> cons "(" $ rend i ts
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"{" :ts -> cons "{" $ new (i+1) $ rend (i+1) ts
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"}" : ";":ts -> new (i-1) $ space "}" $ cons ";" $ new (i-1) $ rend (i-1) ts
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"}" :ts -> new (i-1) $ cons "}" $ new (i-1) $ rend (i-1) ts
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";" :ts -> cons ";" $ new i $ rend i ts
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t : "," :ts -> cons t $ space "," $ rend i ts
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t : ")" :ts -> cons t $ cons ")" $ rend i ts
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t : "]" :ts -> cons t $ cons "]" $ rend i ts
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t :ts -> space t $ rend i ts
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_ -> ""
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cons s t = s ++ t
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new i s = '\n' : replicate (2*i) ' ' ++ dropWhile isSpace s
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space t s = if null s then t else t ++ " " ++ s
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performBinds :: String -> String
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performBinds = unwords . format . words where
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format ws = case ws of
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w : "&+" : u : ws -> format ((w ++ u) : ws)
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w : ws -> w : format ws
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[] -> []
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unStringLit :: String -> String
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unStringLit s = case s of
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c : cs | strlim c && strlim (last cs) -> init cs
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_ -> s
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where
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strlim = (=='\'')
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concatRemSpace :: String -> String
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concatRemSpace = concat . words
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{-
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concatRemSpace s = case s of
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'<':cs -> exceptXML concatRemSpace cs
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c : cs | isSpace c -> concatRemSpace cs
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c :cs -> c : concatRemSpace cs
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_ -> s
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-} |