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|
module GF.Command.TreeOperations (
treeOp,
allTreeOps
) where
import GF.Compile.TypeCheck
import PGF
import Data.List
type TreeOp = [Expr] -> [Expr]
treeOp :: PGF -> String -> Maybe TreeOp
treeOp pgf f = fmap snd $ lookup f $ allTreeOps pgf
allTreeOps :: PGF -> [(String,(String,TreeOp))]
allTreeOps pgf = [
("compute",("compute by using semantic definitions (def)",
map (compute pgf))),
("paraphrase",("paraphrase by using semantic definitions (def)",
map tree2expr . nub . concatMap (paraphrase pgf . expr2tree))),
("smallest",("sort trees from smallest to largest, in number of nodes",
smallest)),
("typecheck",("type check and solve metavariables; reject if incorrect",
concatMap (typecheck pgf)))
]
smallest :: [Expr] -> [Expr]
smallest = sortBy (\t u -> compare (size t) (size u)) where
size t = case t of
EAbs _ e -> size e + 1
EApp e1 e2 -> size e1 + size e2 + 1
_ -> 1
{-
toTree :: G.Term -> Tree
toTree t = case M.termForm t of
Ok (xx,f,aa) -> Abs xx (Fun f (map toTree aa))
fromTree :: Tree -> G.Term
fromTree t = case t of
Abs xx b -> M.mkAbs xx (fromTree b)
Var x -> M.vr x
Fun f ts -> M.mkApp f (map fromTree ts)
-}
{-
data Tree =
Abs [CId] Tree -- ^ lambda abstraction. The list of variables is non-empty
| Var CId -- ^ variable
| Fun CId [Tree] -- ^ function application
| Lit Literal -- ^ literal
| Meta Int -- ^ meta variable
data Literal =
LStr String -- ^ string constant
| LInt Integer -- ^ integer constant
| LFlt Double -- ^ floating point constant
mkType :: A.Type -> C.Type
mkType t = case GM.typeForm t of
Ok (hyps,(_,cat),args) -> C.DTyp (mkContext hyps) (i2i cat) (map mkExp args)
mkExp :: A.Term -> C.Expr
-}
|
