forked from GitHub/gf-core
moved all old source code to src-2.9 ; src will be for GF 3 development
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aarne
155
src-2.9/Transfer/Core/Print.hs
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155
src-2.9/Transfer/Core/Print.hs
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{-# OPTIONS_GHC -fglasgow-exts #-}
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module Transfer.Core.Print where
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-- pretty-printer generated by the BNF converter
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import Transfer.Core.Abs
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import Data.Char
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import Data.List (intersperse)
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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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unwordsD :: [Doc] -> Doc
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unwordsD = concatD . intersperse (doc (showChar ' '))
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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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instance Print Char where
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prt _ s = doc (showChar '\'' . mkEsc '\'' s . showChar '\'')
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instance Print String where
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prt _ 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 (Tree c) where
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prt _i e = case e of
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Module decls -> prPrec _i 0 (concatD [prt 0 decls])
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DataDecl cident exp consdecls -> prPrec _i 0 (concatD [doc (showString "data") , prt 0 cident , doc (showString ":") , prt 0 exp , doc (showString "where") , doc (showString "{") , prt 0 consdecls , doc (showString "}")])
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TypeDecl cident exp -> prPrec _i 0 (concatD [prt 0 cident , doc (showString ":") , prt 0 exp])
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ValueDecl cident exp -> prPrec _i 0 (concatD [prt 0 cident , doc (showString "=") , prt 0 exp])
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ConsDecl cident exp -> prPrec _i 0 (concatD [prt 0 cident , doc (showString ":") , prt 0 exp])
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PCons cident patterns -> prPrec _i 0 (concatD [doc (showString "(") , prt 0 cident , prt 0 patterns , doc (showString ")")])
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PVar patternvariable -> prPrec _i 0 (concatD [prt 0 patternvariable])
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PRec fieldpatterns -> prPrec _i 0 (concatD [doc (showString "rec") , doc (showString "{") , prt 0 fieldpatterns , doc (showString "}")])
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PStr str -> prPrec _i 0 (concatD [prt 0 str])
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PInt n -> prPrec _i 0 (concatD [prt 0 n])
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FieldPattern cident pattern -> prPrec _i 0 (concatD [prt 0 cident , doc (showString "=") , prt 0 pattern])
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PVVar cident -> prPrec _i 0 (concatD [prt 0 cident])
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PVWild -> prPrec _i 0 (concatD [doc (showString "_")])
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ELet letdefs exp -> prPrec _i 0 (concatD [doc (showString "let") , doc (showString "{") , prt 0 letdefs , doc (showString "}") , doc (showString "in") , prt 0 exp])
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ECase exp cases -> prPrec _i 0 (concatD [doc (showString "case") , prt 0 exp , doc (showString "of") , doc (showString "{") , prt 0 cases , doc (showString "}")])
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EAbs patternvariable exp -> prPrec _i 1 (concatD [doc (showString "\\") , prt 0 patternvariable , doc (showString "->") , prt 0 exp])
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EPi patternvariable exp0 exp1 -> prPrec _i 1 (concatD [doc (showString "(") , prt 0 patternvariable , doc (showString ":") , prt 0 exp0 , doc (showString ")") , doc (showString "->") , prt 0 exp1])
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EApp exp0 exp1 -> prPrec _i 3 (concatD [prt 3 exp0 , prt 4 exp1])
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EProj exp cident -> prPrec _i 4 (concatD [prt 4 exp , doc (showString ".") , prt 0 cident])
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ERecType fieldtypes -> prPrec _i 5 (concatD [doc (showString "sig") , doc (showString "{") , prt 0 fieldtypes , doc (showString "}")])
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ERec fieldvalues -> prPrec _i 5 (concatD [doc (showString "rec") , doc (showString "{") , prt 0 fieldvalues , doc (showString "}")])
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EVar cident -> prPrec _i 5 (concatD [prt 0 cident])
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EType -> prPrec _i 5 (concatD [doc (showString "Type")])
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EStr str -> prPrec _i 5 (concatD [prt 0 str])
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EInteger n -> prPrec _i 5 (concatD [prt 0 n])
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EDouble d -> prPrec _i 5 (concatD [prt 0 d])
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EMeta tmeta -> prPrec _i 5 (concatD [prt 0 tmeta])
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LetDef cident exp -> prPrec _i 0 (concatD [prt 0 cident , doc (showString "=") , prt 0 exp])
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Case pattern exp0 exp1 -> prPrec _i 0 (concatD [prt 0 pattern , doc (showString "|") , prt 0 exp0 , doc (showString "->") , prt 0 exp1])
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FieldType cident exp -> prPrec _i 0 (concatD [prt 0 cident , doc (showString ":") , prt 0 exp])
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FieldValue cident exp -> prPrec _i 0 (concatD [prt 0 cident , doc (showString "=") , prt 0 exp])
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TMeta str -> prPrec _i 0 (doc (showString str))
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CIdent str -> prPrec _i 0 (doc (showString str))
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instance Print [Decl] where
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prt _ 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 [ConsDecl] where
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prt _ 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 [Pattern] where
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prt _ 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 [FieldPattern] where
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prt _ 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 [LetDef] where
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prt _ 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 [Case] where
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prt _ 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 [FieldType] where
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prt _ 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 [FieldValue] where
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prt _ 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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