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fixed check, if 0 constructors then no List.nth is allowed
[helm.git] / helm / software / components / cic_disambiguation / number_notation.ml
1 (* Copyright (C) 2004, HELM Team.
2  * 
3  * This file is part of HELM, an Hypertextual, Electronic
4  * Library of Mathematics, developed at the Computer Science
5  * Department, University of Bologna, Italy.
6  * 
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8  * modify it under the terms of the GNU General Public License
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10  * of the License, or (at your option) any later version.
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25
26 (* $Id$ *)
27
28 let _ =
29   DisambiguateChoices.add_num_choice
30     ("natural number",
31       (fun _ num _ -> LibraryObjects.build_nat (int_of_string num)));
32   DisambiguateChoices.add_num_choice
33     ("Coq natural number",
34       (fun _ num _ -> HelmLibraryObjects.build_nat (int_of_string num)));
35   DisambiguateChoices.add_num_choice
36     ("real number",
37       (fun _ num _ -> HelmLibraryObjects.build_real (int_of_string num)));
38   DisambiguateChoices.add_num_choice
39     ("binary positive number",
40       (fun _ num _ ->
41         let num = int_of_string num in
42         if num = 0 then
43           raise (DisambiguateTypes.Invalid_choice (None, lazy "0 is not a valid positive number"))
44         else
45           HelmLibraryObjects.build_bin_pos num));
46   DisambiguateChoices.add_num_choice
47     ("binary integer number",
48       (fun _ num _ ->
49         let num = int_of_string num in
50         if num = 0 then
51           HelmLibraryObjects.BinInt.z0
52         else if num > 0 then
53           Cic.Appl [
54             HelmLibraryObjects.BinInt.zpos;
55             HelmLibraryObjects.build_bin_pos num ]
56         else
57           assert false))