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module PrintCFG where
-- pretty-printer generated by the BNF converter
import AbsCFG
import Char
-- the top-level printing method
printTree :: Print a => a -> String
printTree = render . prt 0
type Doc = [ShowS] -> [ShowS]
doc :: ShowS -> Doc
doc = (:)
-- seriously hacked spacing
render :: Doc -> String
render d = rend 0 (map ($ "") $ d []) "" where
rend i ss = case ss of
";" :ts -> showString ";" . new i . rend i ts
-- H removed a bunch of cases here
"]":".":ts -> showString "]" . space "." . rend i ts -- H
t:t' :ts | noSpace t' -> showString t . showString t' . rend i ts -- H
t :ts | noSpace t -> showString t . rend i ts -- H
t :ts -> space t . rend i ts
_ -> id
new i = showChar '\n' . replicateS (2*i) (showChar ' ') . dropWhile isSpace
space t = showString t . (\s -> if null s then "" else (' ':s))
noSpace t = t `elem` ["[","]","{","}",",","/",":",".","!"] -- H
parenth :: Doc -> Doc
parenth ss = doc (showChar '(') . ss . doc (showChar ')')
concatS :: [ShowS] -> ShowS
concatS = foldr (.) id
concatD :: [Doc] -> Doc
concatD = foldr (.) id
replicateS :: Int -> ShowS -> ShowS
replicateS n f = concatS (replicate n f)
-- the printer class does the job
class Print a where
prt :: Int -> a -> Doc
prtList :: [a] -> Doc
prtList = concatD . map (prt 0)
instance Print a => Print [a] where
prt _ = prtList
instance Print Char where
prt _ s = doc (showChar '\'' . mkEsc '\'' s . showChar '\'')
prtList s = doc (showChar '"' . concatS (map (mkEsc '"') s) . showChar '"')
mkEsc :: Char -> Char -> ShowS
mkEsc q s = case s of
_ | s == q -> showChar '\\' . showChar s
'\\'-> showString "\\\\"
'\n' -> showString "\\n"
'\t' -> showString "\\t"
_ -> showChar s
prPrec :: Int -> Int -> Doc -> Doc
prPrec i j = if j<i then parenth else id
instance Print Integer where
prt _ x = doc (shows x)
prtList es = case es of
[] -> (concatD [])
[x] -> (concatD [prt 0 x])
x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
instance Print Double where
prt _ x = doc (shows x)
instance Print Ident where
prt _ (Ident i) = doc (showString i)
instance Print Grammars where
prt i e = case e of
Grammars grammars -> prPrec i 0 (concatD [prt 0 grammars])
instance Print Grammar where
prt i e = case e of
Grammar id flags rules -> prPrec i 0 (concatD [doc (showString "grammar") , prt 0 id , prt 0 flags , prt 0 rules , doc (showString "end") , doc (showString "grammar")])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , prt 0 xs])
instance Print Flag where
prt i e = case e of
StartCat category -> prPrec i 0 (concatD [doc (showString "startcat") , prt 0 category])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
instance Print Rule where
prt i e = case e of
Rule id name profile category symbols -> prPrec i 0 (concatD [prt 0 id , doc (showString ":") , prt 0 name , prt 0 profile , doc (showString ".") , prt 0 category , doc (showString "->") , prt 0 symbols])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
instance Print Profile where
prt i e = case e of
Profile intss -> prPrec i 0 (concatD [doc (showString "[") , prt 0 intss , doc (showString "]")])
instance Print Ints where
prt i e = case e of
Ints ns -> prPrec i 0 (concatD [doc (showString "[") , prt 0 ns , doc (showString "]")])
prtList es = case es of
[] -> (concatD [])
[x] -> (concatD [prt 0 x])
x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
instance Print Symbol where
prt i e = case e of
CatS category -> prPrec i 0 (concatD [prt 0 category])
TermS str -> prPrec i 0 (concatD [prt 0 str])
prtList es = case es of
[] -> (concatD [doc (showString ".")])
[x] -> (concatD [prt 0 x])
x:xs -> (concatD [prt 0 x , prt 0 xs])
instance Print Name where
prt i e = case e of
Name identparams category -> prPrec i 0 (concatD [prt 0 identparams , prt 0 category])
instance Print Category where
prt i e = case e of
Category identparam id projs -> prPrec i 0 (concatD [prt 0 identparam , doc (showString ".") , prt 0 id , prt 0 projs])
instance Print IdentParam where
prt i e = case e of
IdentParam id fields -> prPrec i 0 (concatD [prt 0 id , doc (showString "{") , prt 0 fields , doc (showString "}")])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , doc (showString "/") , prt 0 xs])
instance Print Field where
prt i e = case e of
Field keyvalue -> prPrec i 0 (concatD [doc (showString ".") , prt 0 keyvalue])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
instance Print Proj where
prt i e = case e of
Proj param -> prPrec i 0 (concatD [doc (showString "!") , prt 0 param])
prtList es = case es of
[] -> (concatD [])
x:xs -> (concatD [prt 0 x , prt 0 xs])
instance Print KeyValue where
prt i e = case e of
KeyValue id param -> prPrec i 0 (concatD [prt 0 id , doc (showString "=") , prt 0 param])
prtList es = case es of
[] -> (concatD [])
[x] -> (concatD [prt 0 x])
x:xs -> (concatD [prt 0 x , doc (showString ";") , prt 0 xs])
instance Print Param where
prt i e = case e of
ParamSimple id -> prPrec i 0 (concatD [prt 0 id])
ParamPatt id params -> prPrec i 0 (concatD [prt 0 id , doc (showString "(") , prt 0 params , doc (showString ")")])
ParamRec keyvalues -> prPrec i 0 (concatD [doc (showString "{") , prt 0 keyvalues , doc (showString "}")])
prtList es = case es of
[] -> (concatD [])
[x] -> (concatD [prt 0 x])
x:xs -> (concatD [prt 0 x , doc (showString ",") , prt 0 xs])
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