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module Paraphrases (mkParaphrases) where
import Abstract
import PrGrammar
import LookAbs
import AbsCompute
import Operations
import List (nub)
-- paraphrases of GF terms. AR 6/10/1998 -- 24/9/1999 -- 5/7/2000 -- 5/6/2002
-- Copyright (c) Aarne Ranta 1998--99, under GNU General Public License (see GPL)
-- thus inherited from the old GF. Incomplete and inefficient...
mkParaphrases :: GFCGrammar -> Term -> [Term]
mkParaphrases st = nub . map (beta []) . paraphrases (allDefs st)
type Definition = (Fun,Term)
paraphrases :: [Definition] -> Term -> [Term]
paraphrases th t =
paraImmed th t ++
--- paraMatch th t ++
case t of
App c a -> [App d b | d <- paraphrases th c, b <- paraphrases th a]
Abs x b -> [Abs x d | d <- paraphrases th b]
c -> []
++ [t]
paraImmed :: [Definition] -> Term -> [Term]
paraImmed defs t =
[Q m f | ((m,f), u) <- defs, t == u] ++ --- eqTerm
case t of
---- Cn c -> [u | (f, u) <- defs, eqStrIdent f c]
_ -> []
{- ---
paraMatch :: [Definition] -> Trm -> [Trm]
paraMatch th@defs t =
[mkApp (Cn f) xx | (PC f zz, u) <- defs,
let (fs,sn) = fullApp u, fs == h, length sn == length zz] ++
case findAMatch defs t of
Ok (g,b) -> [substTerm [] g b]
_ -> []
where
(h,xx) = fullApp t
fullApp c = case c of
App f a -> (f', a' ++ [a]) where (f',a') = fullApp f
c -> (c,[])
-}
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