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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))
]
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
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