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|
----------------------------------------------------------------------
-- |
-- Module : GrammarToHaskell
-- Maintainer : Aarne Ranta
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/04/26 09:54:11 $
-- > CVS $Author: bringert $
-- > CVS $Revision: 1.7 $
--
-- to write a GF abstract grammar into a Haskell module with translations from
-- data objects into GF trees. Example: GSyntax for Agda.
-- AR 11/11/1999 -- 7/12/2000 -- 18/5/2004
-----------------------------------------------------------------------------
module GF.API.GrammarToHaskell (grammar2haskell) where
import qualified GF.Canon.GFC as GFC
import GF.Grammar.Macros
import GF.Infra.Modules
import GF.Data.Operations
-- | the main function
grammar2haskell :: GFC.CanonGrammar -> String
grammar2haskell gr = foldr (++++) [] $
haskPreamble ++ [datatypes gr', gfinstances gr', fginstances gr']
where gr' = hSkeleton gr
-- | by this you can prefix all identifiers with stg; the default is 'G'
gId :: OIdent -> OIdent
gId i = 'G':i
haskPreamble =
[
"module GSyntax where",
"",
"import GF.Infra.Ident",
"import GF.Grammar.Grammar",
"import GF.Grammar.PrGrammar",
"import GF.Grammar.Macros",
"import GF.Data.Operations",
"----------------------------------------------------",
"-- automatic translation from GF to Haskell",
"----------------------------------------------------",
"",
"class Gf a where gf :: a -> Trm",
"class Fg a where fg :: Trm -> a",
"",
predefInst "String" "K s",
"",
predefInst "Int" "EInt s",
"",
"----------------------------------------------------",
"-- below this line machine-generated",
"----------------------------------------------------",
""
]
predefInst typ patt = let gtyp = gId typ in
"newtype" +++ gtyp +++ "=" +++ gtyp +++ typ +++ " deriving Show" +++++
"instance Gf" +++ gtyp +++ "where" ++++
" gf (" ++ gtyp +++ "s) =" +++ patt +++++
"instance Fg" +++ gtyp +++ "where" ++++
" fg t =" ++++
" case termForm t of" ++++
" Ok ([]," +++ patt +++ ",[]) ->" +++ gtyp +++ "s" ++++
" _ -> error (\"no" +++ gtyp +++ "\" ++ prt t)"
type OIdent = String
type HSkeleton = [(OIdent, [(OIdent, [OIdent])])]
datatypes, gfinstances, fginstances :: (String,HSkeleton) -> String
datatypes = (foldr (+++++) "") . (filter (/="")) . (map hDatatype) . snd
gfinstances (m,g) = (foldr (+++++) "") $ (filter (/="")) $ (map (hInstance m)) g
fginstances (m,g) = (foldr (+++++) "") $ (filter (/="")) $ (map (fInstance m)) g
hDatatype :: (OIdent, [(OIdent, [OIdent])]) -> String
hInstance, fInstance :: String -> (OIdent, [(OIdent, [OIdent])]) -> String
hDatatype ("Cn",_) = "" ---
hDatatype (cat,[]) = ""
hDatatype (cat,rules) =
"data" +++ gId cat +++ "=" ++
(if length rules == 1 then "" else "\n ") +++
foldr1 (\x y -> x ++ "\n |" +++ y)
[gId f +++ foldr (+++) "" (map gId xx) | (f,xx) <- rules] ++++
" deriving Show"
----hInstance m ("Cn",_) = "" --- seems to belong to an old applic. AR 18/5/2004
hInstance m (cat,[]) = ""
hInstance m (cat,rules) =
"instance Gf" +++ gId cat +++ "where" ++
(if length rules == 1 then "" else "\n") +++
foldr1 (\x y -> x ++ "\n" +++ y) [mkInst f xx | (f,xx) <- rules]
where
mkInst f xx =
"gf " ++
(if length xx == 0 then gId f else prParenth (gId f +++ foldr1 (+++) xx')) +++
"=" +++
"appqc \"" ++ m ++ "\" \"" ++ f ++ "\"" +++
"[" ++ prTList ", " ["gf" +++ x | x <- xx'] ++ "]"
where xx' = ["x" ++ show i | (_,i) <- zip xx [1..]]
----fInstance m ("Cn",_) = "" ---
fInstance m (cat,[]) = ""
fInstance m (cat,rules) =
"instance Fg" +++ gId cat +++ "where" ++++
" fg t =" ++++
" case termForm t of" ++++
foldr1 (\x y -> x ++ "\n" ++ y) [mkInst f xx | (f,xx) <- rules] ++++
" _ -> error (\"no" +++ cat ++ " \" ++ prt t)"
where
mkInst f xx =
" Ok ([], Q (IC \"" ++ m ++ "\") (IC \"" ++ f ++ "\")," ++
"[" ++ prTList "," xx' ++ "])" +++
"->" +++
gId f +++
prTList " " [prParenth ("fg" +++ x) | x <- xx']
where xx' = ["x" ++ show i | (_,i) <- zip xx [1..]]
hSkeleton :: GFC.CanonGrammar -> (String,HSkeleton)
hSkeleton gr = (name,collectR rules [(c,[]) | c <- cats]) where
collectR rr hh =
case rr of
(fun,typ):rs -> case catSkeleton typ of
Ok (cats,cat) ->
collectR rs (updateSkeleton (symid (snd cat)) hh (fun,
map (symid . snd) cats))
_ -> collectR rs hh
_ -> hh
cats = [symid cat | (cat,GFC.AbsCat _ _) <- defs]
rules = [(symid fun, typ) | (fun,GFC.AbsFun typ _) <- defs]
defs = concat [tree2list (jments m) | im@(_,ModMod m) <- modules gr, isModAbs m]
name = ifNull "UnknownModule" (symid . last) [n | (n,ModMod m) <- modules gr, isModAbs m]
updateSkeleton :: OIdent -> HSkeleton -> (OIdent, [OIdent]) -> HSkeleton
updateSkeleton cat skel rule =
case skel of
(cat0,rules):rr | cat0 == cat -> (cat0, rule:rules) : rr
(cat0,rules):rr -> (cat0, rules) : updateSkeleton cat rr rule
|
