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|
----------------------------------------------------------------------
-- |
-- Module : CFtoGrammar
-- Maintainer : AR
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/02/18 19:21:07 $
-- > CVS $Author: peb $
-- > CVS $Revision: 1.5 $
--
-- 26\/1\/2000 -- 18\/4 -- 24\/3\/2004
-----------------------------------------------------------------------------
module CFtoGrammar (cf2grammar) where
import Ident
import Grammar
import qualified AbsGF as A
import qualified GrammarToSource as S
import Macros
import CF
import CFIdent
import PPrCF
import Operations
import List (nub)
import Char (isSpace)
cf2grammar :: CF -> [A.TopDef]
cf2grammar cf = concatMap S.trAnyDef (abs ++ conc) where
rules = rulesOfCF cf
abs = cats ++ funs
conc = lintypes ++ lins
cats = [(cat, AbsCat (yes []) (yes [])) |
cat <- nub (concat (map cf2cat rules))] ----notPredef cat
lintypes = [] ----[(cat, CncCat (yes) nope Nothing) | (cat,AbsCat _ _) <- cats]
(funs,lins) = unzip (map cf2rule rules)
cf2cat :: CFRule -> [Ident]
cf2cat (_,(cat, items)) = map cfCat2Ident $ cat : [c | CFNonterm c <- items]
cf2rule :: CFRule -> ((Ident,Info),(Ident,Info))
cf2rule (fun, (cat, items)) = (def,ldef) where
f = cfFun2Ident fun
def = (f, AbsFun (yes (mkProd (args', Cn (cfCat2Ident cat), []))) nope)
args0 = zip (map (mkIdent "x") [0..]) items
args = [(v, Cn (cfCat2Ident c)) | (v, CFNonterm c) <- args0]
args' = [(zIdent "_", Cn (cfCat2Ident c)) | (_, CFNonterm c) <- args0]
ldef = (f, CncFun
Nothing
(yes (mkAbs (map fst args)
(mkRecord (const theLinLabel) [foldconcat (map mkIt args0)])))
nope)
mkIt (v, CFNonterm _) = P (Vr v) theLinLabel
mkIt (_, CFTerm (RegAlts [a])) = K a
mkIt _ = K "" --- regexp not recognized in input CF ; use EBNF for this
foldconcat [] = K ""
foldconcat tt = foldr1 C tt
|
