+(* Copyright (C) 2004, HELM Team.
+ *
+ * This file is part of HELM, an Hypertextual, Electronic
+ * Library of Mathematics, developed at the Computer Science
+ * Department, University of Bologna, Italy.
+ *
+ * HELM is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * HELM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HELM; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ *
+ * For details, see the HELM World-Wide-Web page,
+ * http://helm.cs.unibo.it/
+ *)
+
open Ast
open Parser
EXTEND
term: LEVEL "add"
[
- [ t1 = term; SYMBOL "∨"; t2 = term ->
- return_term loc (Appl [Ident ("or", []); t1; t2])
+ [ t1 = term; SYMBOL <:unicode<lor>> (* ∨ *); t2 = term ->
+ return_term loc (Appl_symbol ("or", 0, [t1; t2]))
]
];
term: LEVEL "mult"
[
- [ t1 = term; SYMBOL "∧"; t2 = term ->
- return_term loc (Appl [Ident ("and", []); t1; t2])
+ [ t1 = term; SYMBOL <:unicode<land>> (* ∧ *); t2 = term ->
+ return_term loc (Appl_symbol ("and", 0, [t1; t2]))
]
];
term: LEVEL "inv"
[
- [ SYMBOL "¬"; t = term ->
- return_term loc (Appl [Ident ("not", []); t])
- ]
+ [ SYMBOL <:unicode<lnot>> (* ¬ *); t = term ->
+ return_term loc (Appl_symbol ("not", 0, [t])) ]
];
END
+
+let _ =
+ Disambiguate.add_symbol_choice "eq"
+ ("leibnitz's equality",
+ (fun interp _ args ->
+ let t1, t2 =
+ match args with
+ | [t1; t2] -> t1, t2
+ | _ -> raise Disambiguate.Invalid_choice
+ in
+ Cic.Appl [
+ Cic.MutInd (HelmLibraryObjects.Logic.eq_URI, 0, []);
+ Cic.Implicit; t1; t2
+ ]))
+