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module TransferDef where
import PGF (Tree)
import Query -- generated from GF
transfer :: Tree -> Tree
transfer = gf . answer . fg
answer :: GQuestion -> GAnswer
answer p = case p of
GOdd x -> test odd x
GEven x -> test even x
GPrime x -> test prime x
value :: GObject -> Int
value e = case e of
GNumber (GInt i) -> fromInteger i
test :: (Int -> Bool) -> GObject -> GAnswer
test f x = if f (value x) then GYes else GNo
prime :: Int -> Bool
prime x = elem x primes where
primes = sieve [2 .. x]
sieve (p:xs) = p : sieve [ n | n <- xs, n `mod` p > 0 ]
sieve [] = []
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