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module Operators (
primitives
) where
import Parser
primitives :: [(String, [Expr] -> Expr)]
primitives =
[
("+", arithmetic (+))
, ("-", arithmetic (-))
, ("*", arithmetic (*))
, ("/", arithmetic div)
]
arithmetic :: (Integer -> Integer -> Integer) -> [Expr] -> Expr
arithmetic op args = IntLiteral $ foldl1 op $ map unwrapNum args
unwrapNum :: Expr -> Integer
unwrapNum (IntLiteral n) = n
unwrapNum _ = undefined
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