forked from GitHub/gf-core
201 lines
7.8 KiB
Haskell
201 lines
7.8 KiB
Haskell
----------------------------------------------------------------------
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-- |
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-- Maintainer : PL
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-- Stability : (stable)
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-- Portability : (portable)
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--
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-- > CVS $Date: 2005/09/14 09:51:18 $
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-- > CVS $Author: peb $
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-- > CVS $Revision: 1.4 $
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--
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-- Converting/Printing different grammar formalisms in Prolog-readable format
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-----------------------------------------------------------------------------
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module GF.Conversion.Prolog (prtSGrammar, prtSMulti, prtSHeader, prtSRule,
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prtMGrammar, prtMMulti, prtMHeader, prtMRule,
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prtCGrammar, prtCMulti, prtCHeader, prtCRule) where
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import GF.Formalism.GCFG
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import GF.Formalism.SimpleGFC
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import GF.Formalism.MCFG
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import GF.Formalism.CFG
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import GF.Formalism.Utilities
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import GF.Conversion.Types
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import qualified GF.Conversion.GFC as Cnv
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import GF.Data.Operations ((++++), (+++++))
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import GF.Infra.Print
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import qualified GF.Infra.Modules as Mod
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import qualified GF.Infra.Option as Option
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import GF.Data.Operations (okError)
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import GF.Canon.AbsGFC (Flag(..))
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import GF.Canon.GFC (CanonGrammar)
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import GF.Infra.Ident (Ident(..))
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import Data.Maybe (maybeToList, listToMaybe)
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import Data.Char (isLower, isAlphaNum)
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import GF.System.Tracing
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----------------------------------------------------------------------
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-- | printing multiple languages at the same time
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prtSMulti, prtMMulti, prtCMulti :: Option.Options -> CanonGrammar -> String
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prtSMulti = prtMulti prtSHeader prtSRule Cnv.gfc2simple "gfc_"
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prtMMulti = prtMulti prtMHeader prtMRule Cnv.gfc2mcfg "mcfg_"
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prtCMulti = prtMulti prtCHeader prtCRule Cnv.gfc2cfg "cfg_"
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-- code and ideas stolen from GF.CFGM.PrintCFGrammar
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prtMulti prtHeader prtRule conversion prefix opts gr
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= prtHeader ++++ unlines
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[ "\n\n" ++ prtLine ++++
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"%% Language module: " ++ prtQ langmod +++++
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unlines (map (prtRule langmod) rules) |
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lang <- maybe [] (Mod.allConcretes gr) (Mod.greatestAbstract gr),
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let Mod.ModMod (Mod.Module{Mod.flags=fs}) = okError (Mod.lookupModule gr lang),
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let cnvopts = Option.Opts $ map Option.gfcConversion $ getFlag fs "conversion",
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let rules = conversion cnvopts (gr, lang),
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let langmod = (let IC lg = lang in prefix ++ lg) ]
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getFlag :: [Flag] -> String -> [String]
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getFlag fs x = [v | Flg (IC k) (IC v) <- fs, k == x]
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----------------------------------------------------------------------
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-- | SimpleGFC to Prolog
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--
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-- assumes that the profiles in the Simple GFC names are trivial
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prtSGrammar :: SGrammar -> String
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prtSGrammar rules = prtSHeader +++++ unlines (map (prtSRule "") rules)
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prtSHeader :: String
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prtSHeader = prtLine ++++
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"%% Simple GFC grammar in Prolog-readable format" ++++
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"%% Autogenerated from the Grammatical Framework" +++++
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"%% The following predicate is defined:" ++++
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"%% \t rule(Fun, Cat, c(Cat,...), LinTerm)"
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prtSRule :: String -> SRule -> String
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prtSRule lang (Rule (Abs cat cats (Name fun _prof)) (Cnc _ _ mterm))
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= (if null lang then "" else prtQ lang ++ " : ") ++
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prtFunctor "rule" [plfun, plcat, plcats, plcnc] ++ "."
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where plfun = prtQ fun
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plcat = prtSCat cat
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plcats = prtFunctor "c" (map prtSCat cats)
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plcnc = "\n\t" ++ prtSTerm (maybe Empty id mterm)
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prtSTerm (Arg n c p) = prtFunctor "arg" [prtQ c, prt (n+1), prtSPath p]
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-- prtSTerm (c :^ []) = prtQ c
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prtSTerm (c :^ ts) = prtOper "^" (prtQ c) (prtPList (map prtSTerm ts))
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prtSTerm (Rec rec) = prtFunctor "rec" [prtPList [ prtOper "=" (prtQ l) (prtSTerm t) | (l, t) <- rec ]]
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prtSTerm (Tbl tbl) = prtFunctor "tbl" [prtPList [ prtOper "=" (prtSTerm p) (prtSTerm t) | (p, t) <- tbl ]]
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prtSTerm (Variants ts) = prtFunctor "variants" [prtPList (map prtSTerm ts)]
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prtSTerm (t1 :++ t2) = prtOper "+" (prtSTerm t1) (prtSTerm t2)
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prtSTerm (Token t) = prtFunctor "tok" [prtQ t]
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prtSTerm (Empty) = "empty"
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prtSTerm (term :. lbl) = prtOper "*" (prtSTerm term) (prtQ lbl)
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prtSTerm (term :! sel) = prtOper "/" (prtSTerm term) (prtSTerm sel)
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-- prtSTerm (Wildcard) = "wildcard"
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-- prtSTerm (Var var) = prtFunctor "var" [prtQ var]
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prtSPath (Path path) = prtPList (map (either prtQ prtSTerm) path)
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prtSCat (Decl var cat args) = prVar ++ prtFunctor (prtQ cat) (map prtSTTerm args)
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where prVar | var == anyVar = ""
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| otherwise = "_" ++ prtVar var ++ ":"
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prtSTTerm (con :@ args) = prtFunctor (prtQ con) (map prtSTTerm args)
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prtSTTerm (TVar var) = "_" ++ prtVar var
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----------------------------------------------------------------------
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-- | MCFG to Prolog
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prtMGrammar :: MGrammar -> String
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prtMGrammar rules = prtMHeader +++++ unlines (map (prtMRule "") rules)
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prtMHeader :: String
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prtMHeader = prtLine ++++
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"%% Multiple context-free grammar in Prolog-readable format" ++++
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"%% Autogenerated from the Grammatical Framework" +++++
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"%% The following predicate is defined:" ++++
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"%% \t rule(Profile, Cat, c(Cat,...), [Lbl=Symbols,...])"
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prtMRule :: String -> MRule -> String
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prtMRule lang (Rule (Abs cat cats name) (Cnc _lcat _lcats lins))
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= (if null lang then "" else prtQ lang ++ " : ") ++
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prtFunctor "rule" [plname, plcat, plcats, pllins] ++ "."
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where plname = prtName name
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plcat = prtQ cat
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plcats = prtFunctor "c" (map prtQ cats)
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pllins = "\n\t[ " ++ prtSep "\n\t, " (map prtMLin lins) ++ " ]"
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prtMLin (Lin lbl lin) = prtOper "=" (prtQ lbl) (prtPList (map prtMSymbol lin))
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prtMSymbol (Cat (cat, lbl, nr)) = prtFunctor "arg" [prtQ cat, show (nr+1), prtQ lbl]
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prtMSymbol (Tok tok) = prtFunctor "tok" [prtQ tok]
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----------------------------------------------------------------------
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-- | CFG to Prolog
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prtCGrammar :: CGrammar -> String
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prtCGrammar rules = prtCHeader +++++ unlines (map (prtCRule "") rules)
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prtCHeader :: String
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prtCHeader = prtLine ++++
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"%% Context-free grammar in Prolog-readable format" ++++
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"%% Autogenerated from the Grammatical Framework" +++++
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"%% The following predicate is defined:" ++++
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"%% \t rule(Profile, Cat, [Symbol,...])"
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prtCRule :: String -> CRule -> String
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prtCRule lang (CFRule cat syms name)
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= (if null lang then "" else prtQ lang ++ " : ") ++
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prtFunctor "cfgrule" [plname, plcat, plsyms] ++ "."
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where plname = prtName name
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plcat = prtQ cat
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plsyms = prtPList (map prtCSymbol syms)
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prtCSymbol (Cat cat) = prtFunctor "cat" [prtQ cat]
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prtCSymbol (Tok tok) = prtFunctor "tok" [prtQ tok]
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----------------------------------------------------------------------
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-- profiles, quoted strings and more
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prtFunctor f xs = f ++ if null xs then "" else "(" ++ prtSep ", " xs ++ ")"
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prtPList xs = "[" ++ prtSep ", " xs ++ "]"
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prtOper f x y = "(" ++ x ++ " " ++ f ++ " " ++ y ++ ")"
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prtName name@(Name fun profiles)
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| name == coercionName = "1"
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| and (zipWith (==) profiles (map (Unify . return) [0..])) = prtQ fun
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| otherwise = prtFunctor (prtQ fun) (map prtProfile profiles)
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prtProfile (Unify []) = " ? "
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prtProfile (Unify args) = foldr1 (prtOper "=") (map (show . succ) args)
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prtProfile (Constant forest) = prtForest forest
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prtForest (FMeta) = " ? "
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prtForest (FNode fun [fs]) = prtFunctor (prtQ fun) (map prtForest fs)
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prtForest (FNode fun fss) = prtPList [ prtFunctor (prtQ fun) (map prtForest fs) |
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fs <- fss ]
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prtQ atom = prtQStr (prt atom)
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prtQStr atom@(x:xs)
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| isLower x && all isAlphaNumUnder xs = atom
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where isAlphaNumUnder '_' = True
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isAlphaNumUnder x = isAlphaNum x
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prtQStr atom = "'" ++ concatMap esc (prt atom) ++ "'"
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where esc '\'' = "\\'"
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esc '\n' = "\\n"
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esc '\t' = "\\t"
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esc c = [c]
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prtVar var = reprime (prt var)
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where reprime "" = ""
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reprime ('\'' : cs) = "_0" ++ reprime cs
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reprime (c:cs) = c : reprime cs
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prtLine = replicate 70 '%'
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