implementation module ast

import StdEnv
import Text

instance toString Function where
	toString (Function i a e) = concat [toString i, " ", join " " (map toString a), " = ", toString e]

instance toString Expression where
	toString (Lit v) = toString v
	toString (Var s) = toString s
	toString (App l r) = concat ["(", toString l, " ", toString r, ")"]
	toString (Lambda a e) = concat ["(\\", toString a, ".", toString e, ")"]
	toString (Builtin v as) = concat ["'", toString v, "'", join " " (map toString as)]
	toString (Let i b r) = concat [toString i, " = ", toString b, "\n", toString r]
	toString _ = abort "toString Expression not implemented"

instance toString Value where
	toString (Int i) = toString i
	toString (Bool b) = toString b
	toString (Func a as _) = concat ["Function arity ", toString a, " curried ", join "," (map toString as)]