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deque-blog/arithmetic_prn_infix_bad.hs

Last active February 16, 2017 19:50
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arithmetic_prn_infix_bad.hs
prnInfix :: Expr -> String
prnInfix = cata infixAlg where
infixAlg (Op Add xs) = concat (intersperse " + " xs)
infixAlg (Op Mul xs) = concat (intersperse " * " (map parens xs))
infixAlg (Cst n) = show n
infixAlg (Var v) = v
parens x = "(" ++ x ++ ")"
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