ast.icl

   1 implementation module ast
   2
   3 import StdEnv
   4 import Data.Either
   5 import Text
   6 import int
   7
   8 instance toString Function where
   9         toString (Function i a e) = concat [toString i, " ", join " " (map toString a), " = ", toString e]
  10
  11 instance toString Expression where
  12         toString (Lit v) = toString v
  13         toString (Var s) = toString s
  14         toString (App l r) = concat ["(", toString l, " ", toString r, ")"]
  15         toString (Lambda a e) = concat ["(\\", toString a, ". ", toString e, ")"]
  16         toString (Tuple a b) = concat ["(", toString a, ", ", toString b, ")"]
  17         toString (Let ns r) = concat
  18                 [ "let ", concat [concat ["\t", toString n, " = ", toString v, "\n"]\\(n, v)<-ns]
  19                 , "in\n", toString r]
  20         toString _ = abort "toString Expression not implemented"
  21
  22 instance toString Value where
  23         toString (Int i) = toString i
  24         toString (Bool b) = toString b
  25         toString (a ** b) = toString (Tuple a b)
  26         toString (Lambda` v a) = toString (Lambda v a)
  27         toString (Builtin a) = "builtin"