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deque-blog/dsl_arithmetic_2_prn.hs

Created January 20, 2017 20:18
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dsl_arithmetic_2_prn.hs
prn :: Expr -> String
prn = cata algebra where
algebra (Cst n) = show n
algebra (Var x) = x
algebra (Op Add xs) = "(+ " ++ unwords xs ++ ")"
algebra (Op Mul xs) = "(* " ++ unwords xs ++ ")"
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