forked from GitHub/gf-core
starting GFCC format
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aarne
181
src/GF/Canon/GFCC/PrintGFCC.hs
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181
src/GF/Canon/GFCC/PrintGFCC.hs
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{-# OPTIONS -fno-warn-incomplete-patterns #-}
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module GF.Canon.GFCC.PrintGFCC where
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-- pretty-printer generated by the BNF converter
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import GF.Canon.GFCC.AbsGFCC
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import Data.Char
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-- the top-level printing method
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printTree :: Print a => a -> String
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printTree = render . prt 0
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type Doc = [ShowS] -> [ShowS]
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doc :: ShowS -> Doc
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doc = (:)
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render :: Doc -> String
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render d = rend 0 (map ($ "") $ d []) "" where
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rend i ss = case ss of
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"[" :ts -> showChar '[' . rend i ts
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"(" :ts -> showChar '(' . rend i ts
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"{" :ts -> showChar '{' . new (i+1) . rend (i+1) ts
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"}" : ";":ts -> new (i-1) . space "}" . showChar ';' . new (i-1) . rend (i-1) ts
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"}" :ts -> new (i-1) . showChar '}' . new (i-1) . rend (i-1) ts
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";" :ts -> showChar ';' . new i . rend i ts
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t : "," :ts -> showString t . space "," . rend i ts
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t : ")" :ts -> showString t . showChar ')' . rend i ts
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t : "]" :ts -> showString t . showChar ']' . rend i ts
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t :ts -> space t . rend i ts
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_ -> id
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new i = showChar '\n' . replicateS (2*i) (showChar ' ') . dropWhile isSpace
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space t = showString t . (\s -> if null s then "" else (' ':s))
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parenth :: Doc -> Doc
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parenth ss = doc (showChar '(') . ss . doc (showChar ')')
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concatS :: [ShowS] -> ShowS
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concatS = foldr (.) id
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concatD :: [Doc] -> Doc
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concatD = foldr (.) id
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replicateS :: Int -> ShowS -> ShowS
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replicateS n f = concatS (replicate n f)
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-- the printer class does the job
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class Print a where
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prt :: Int -> a -> Doc
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prtList :: [a] -> Doc
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prtList = concatD . map (prt 0)
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instance Print a => Print [a] where
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prt _ = prtList
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instance Print Char where
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prt _ s = doc (showChar '\'' . mkEsc '\'' s . showChar '\'')
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prtList s = doc (showChar '"' . concatS (map (mkEsc '"') s) . showChar '"')
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mkEsc :: Char -> Char -> ShowS
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mkEsc q s = case s of
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_ | s == q -> showChar '\\' . showChar s
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'\\'-> showString "\\\\"
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'\n' -> showString "\\n"
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'\t' -> showString "\\t"
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_ -> showChar s
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prPrec :: Int -> Int -> Doc -> Doc
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prPrec i j = if j<i then parenth else id
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instance Print Integer where
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prt _ x = doc (shows x)
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instance Print Double where
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prt _ x = doc (shows x)
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instance Print CId where
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prt _ (CId i) = doc (showString i)
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prtList es = case es of
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[] -> (concatD [])
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x:xs -> (concatD [prt 0 x , prt 0 xs])
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instance Print Grammar where
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prt i e = case e of
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Grm header abstract concretes -> prPrec i 0 (concatD [prt 0 header , doc (showString ";") , prt 0 abstract , doc (showString ";") , prt 0 concretes , doc (showString ";")])
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instance Print Header where
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prt i e = case e of
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Hdr cid cids -> prPrec i 0 (concatD [doc (showString "grammar") , prt 0 cid , doc (showString "(") , prt 0 cids , doc (showString ")")])
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instance Print Abstract where
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prt i e = case e of
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Abs absdefs -> prPrec i 0 (concatD [doc (showString "abstract") , doc (showString "{") , prt 0 absdefs , doc (showString "}") , doc (showString ";")])
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instance Print Concrete where
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prt i e = case e of
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Cnc cid cncdefs -> prPrec i 0 (concatD [doc (showString "concrete") , prt 0 cid , doc (showString "{") , prt 0 cncdefs , doc (showString "}")])
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prtList es = case es of
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[] -> (concatD [])
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x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
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instance Print AbsDef where
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prt i e = case e of
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Fun cid type' exp -> prPrec i 0 (concatD [prt 0 cid , doc (showString ":") , prt 0 type' , doc (showString "=") , prt 0 exp])
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prtList es = case es of
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[] -> (concatD [])
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x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
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instance Print CncDef where
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prt i e = case e of
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Lin cid term -> prPrec i 0 (concatD [prt 0 cid , doc (showString "=") , prt 0 term])
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prtList es = case es of
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[] -> (concatD [])
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x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
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instance Print Type where
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prt i e = case e of
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Typ cids cid -> prPrec i 0 (concatD [prt 0 cids , doc (showString "->") , prt 0 cid])
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instance Print Exp where
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prt i e = case e of
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Tr atom exps -> prPrec i 0 (concatD [doc (showString "(") , prt 0 atom , prt 0 exps , doc (showString ")")])
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prtList es = case es of
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[] -> (concatD [])
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x:xs -> (concatD [prt 0 x , prt 0 xs])
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instance Print Atom where
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prt i e = case e of
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AC cid -> prPrec i 0 (concatD [prt 0 cid])
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AS str -> prPrec i 0 (concatD [prt 0 str])
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AI n -> prPrec i 0 (concatD [prt 0 n])
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instance Print Term where
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prt i e = case e of
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R terms -> prPrec i 0 (concatD [doc (showString "[") , prt 0 terms , doc (showString "]")])
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P term0 term -> prPrec i 0 (concatD [prt 0 term0 , doc (showString "[") , prt 0 term , doc (showString "]")])
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S terms -> prPrec i 0 (concatD [doc (showString "(") , prt 0 terms , doc (showString ")")])
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K tokn -> prPrec i 0 (concatD [prt 0 tokn])
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V n -> prPrec i 0 (concatD [doc (showString "$") , prt 0 n])
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C n -> prPrec i 0 (concatD [prt 0 n])
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F cid -> prPrec i 0 (concatD [prt 0 cid])
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FV terms -> prPrec i 0 (concatD [doc (showString "[|") , prt 0 terms , doc (showString "|]")])
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W str term -> prPrec i 0 (concatD [doc (showString "(") , prt 0 str , doc (showString "+") , prt 0 term , doc (showString ")")])
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prtList es = case es of
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[] -> (concatD [])
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[x] -> (concatD [prt 0 x])
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x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
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instance Print Tokn where
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prt i e = case e of
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KS str -> prPrec i 0 (concatD [prt 0 str])
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KP strs variants -> prPrec i 0 (concatD [doc (showString "[") , doc (showString "pre") , prt 0 strs , doc (showString "[") , prt 0 variants , doc (showString "]") , doc (showString "]")])
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instance Print Variant where
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prt i e = case e of
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Var strs0 strs -> prPrec i 0 (concatD [prt 0 strs0 , doc (showString "/") , prt 0 strs])
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prtList es = case es of
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[] -> (concatD [])
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[x] -> (concatD [prt 0 x])
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x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
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