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 (Let i b r) = concat [toString i, " = ", toString b, "\n", toString r]
  17         toString _ = abort "toString Expression not implemented"
  18
  19 instance toString Value where
  20         toString (Int i) = toString i
  21         toString (Bool b) = toString b
  22         toString (Func a) = concat ["Function "]