src/baseTypes.sml

   1 (* HCoop Domtool (http://hcoop.sourceforge.net/)
   2  * Copyright (c) 2006, Adam Chlipala
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17  *)
  18
  19 (* Add some base types *)
  20
  21 structure BaseTypes :> BASE_TYPES = struct
  22
  23 open Ast
  24
  25 val _ = Env.registerType ("even", fn (EInt n, _) => n mod 2 = 0
  26                                    | _ => false)
  27
  28 val _ = Env.registerType ("digits", fn (EString s, _) => CharVector.all Char.isDigit s
  29                                    | _ => false)
  30
  31 end