mirror of
https://github.com/GrammaticalFramework/gf-core.git
synced 2026-07-15 01:52:45 -06:00
aarne
211 lines
7.0 KiB
Haskell
211 lines
7.0 KiB
Haskell
{-# OPTIONS -fno-warn-incomplete-patterns #-}
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module GF.FCFG.PrintFCFG where
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-- pretty-printer generated by the BNF converter
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import GF.FCFG.AbsFCFG
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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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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 Double where
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prt _ x = doc (shows x)
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instance Print Ident where
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prt _ (Ident i) = doc (showString i)
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instance Print FGrammar where
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prt i e = case e of
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FGr frules -> prPrec i 0 (concatD [prt 0 frules])
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instance Print FRule where
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prt i e = case e of
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FR abstract fsymbolss -> prPrec i 0 (concatD [prt 0 abstract , doc (showString ":=") , prt 0 fsymbolss])
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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 Abstract where
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prt i e = case e of
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Abs fcat fcats name -> prPrec i 0 (concatD [prt 0 fcat , doc (showString "->") , prt 0 fcats , doc (showString ".") , prt 0 name])
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instance Print FSymbol where
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prt i e = case e of
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FSymCat fcat n0 n -> prPrec i 0 (concatD [doc (showString "(") , prt 0 fcat , prt 0 n0 , prt 0 n , doc (showString ")")])
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FSymTok str -> prPrec i 0 (concatD [prt 0 str])
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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 FCat where
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prt i e = case e of
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FC n id pathelss pathterms -> prPrec i 0 (concatD [doc (showString "(") , prt 0 n , prt 0 id , doc (showString "[") , prt 0 pathelss , doc (showString "]") , doc (showString "[") , prt 0 pathterms , doc (showString "]") , 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 PathEl where
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prt i e = case e of
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PLabel label -> prPrec i 0 (concatD [prt 0 label])
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PTerm term -> prPrec i 0 (concatD [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 PathTerm where
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prt i e = case e of
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PtT pathels term -> prPrec i 0 (concatD [doc (showString "(") , prt 0 pathels , 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:xs -> (concatD [prt 0 x , prt 0 xs])
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instance Print Name where
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prt i e = case e of
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Nm id profiles -> prPrec i 0 (concatD [prt 0 id , doc (showString "[") , prt 0 profiles , doc (showString "]")])
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instance Print Profile where
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prt i e = case e of
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Unify ns -> prPrec i 0 (concatD [doc (showString "[") , prt 0 ns , doc (showString "]")])
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Const forest -> prPrec i 0 (concatD [prt 0 forest])
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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 Forest where
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prt i e = case e of
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FMeta -> prPrec i 0 (concatD [doc (showString "?")])
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FNode id forestss -> prPrec i 0 (concatD [doc (showString "(") , prt 0 id , prt 0 forestss , doc (showString ")")])
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FString str -> prPrec i 0 (concatD [prt 0 str])
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FInt n -> prPrec i 0 (concatD [prt 0 n])
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FFloat d -> prPrec i 0 (concatD [prt 0 d])
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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 Term where
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prt i e = case e of
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Arg n id pathels -> prPrec i 0 (concatD [doc (showString "(") , prt 0 n , prt 0 id , prt 0 pathels , doc (showString ")")])
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Constr cident terms -> prPrec i 0 (concatD [doc (showString "(") , prt 0 cident , doc (showString "-") , prt 0 terms , doc (showString ")")])
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Rec assocs -> prPrec i 0 (concatD [doc (showString "[") , prt 0 assocs , doc (showString "]")])
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Proj term label -> prPrec i 0 (concatD [doc (showString "(") , prt 0 term , doc (showString ".") , prt 0 label , doc (showString ")")])
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Tbl cases -> prPrec i 0 (concatD [doc (showString "[-") , prt 0 cases , doc (showString "-]")])
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Select term0 term -> prPrec i 0 (concatD [doc (showString "(") , prt 0 term0 , doc (showString "!") , prt 0 term , doc (showString ")")])
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Vars terms -> prPrec i 0 (concatD [doc (showString "[|") , prt 0 terms , doc (showString "|]")])
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Concat term0 term -> prPrec i 0 (concatD [doc (showString "(") , prt 0 term0 , doc (showString "++") , prt 0 term , doc (showString ")")])
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Tok str -> prPrec i 0 (concatD [prt 0 str])
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Empty -> prPrec i 0 (concatD [doc (showString "(") , 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 Case where
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prt i e = case e of
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Cas term0 term -> prPrec i 0 (concatD [prt 0 term0 , 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 Assoc where
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prt i e = case e of
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Ass label term -> prPrec i 0 (concatD [prt 0 label , 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 Label where
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prt i e = case e of
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L id -> prPrec i 0 (concatD [prt 0 id])
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LV n -> prPrec i 0 (concatD [doc (showString "$") , prt 0 n])
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instance Print CIdent where
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prt i e = case e of
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CIQ id0 id -> prPrec i 0 (concatD [prt 0 id0 , doc (showString ".") , prt 0 id])
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