helm/software/matita/contribs/ng_assembly/common/string.ma

   1 (**************************************************************************)
   2 (*       ___                                                              *)
   3 (*      ||M||                                                             *)
   4 (*      ||A||       A project by Andrea Asperti                           *)
   5 (*      ||T||                                                             *)
   6 (*      ||I||       Developers:                                           *)
   7 (*      ||T||         The HELM team.                                      *)
   8 (*      ||A||         http://helm.cs.unibo.it                             *)
   9 (*      \   /                                                             *)
  10 (*       \ /        This file is distributed under the terms of the       *)
  11 (*        v         GNU General Public License Version 2                  *)
  12 (*                                                                        *)
  13 (**************************************************************************)
  14
  15 (* ********************************************************************** *)
  16 (*                          Progetto FreeScale                            *)
  17 (*                                                                        *)
  18 (*   Sviluppato da: Ing. Cosimo Oliboni, oliboni@cs.unibo.it              *)
  19 (*   Sviluppo: 2008-2010                                                  *)
  20 (*                                                                        *)
  21 (* ********************************************************************** *)
  22
  23 include "common/ascii.ma".
  24 include "common/list_utility.ma".
  25
  26 (* ************************ *)
  27 (* MANIPOLAZIONE DI STRINGA *)
  28 (* ************************ *)
  29
  30 (* tipo pubblico *)
  31 ndefinition aux_str_type ≝ list ascii.
  32
  33 (* strcmp *)
  34 ndefinition eq_str ≝
  35  bfold_right_list2 ascii (λx,y.eq_ascii x y).
  36
  37 (* ************ *)
  38 (* STRINGA + ID *)
  39 (* ************ *)
  40
  41 (* tipo pubblico *)
  42 nrecord strId : Type ≝
  43  {
  44  str_elem: aux_str_type;
  45  id_elem: nat
  46  }.
  47
  48 (* confronto *)
  49 ndefinition eq_strId ≝
  50 λsid,sid':strId.
  51  (eq_str (str_elem sid) (str_elem sid'))⊗
  52  (eq_nat (id_elem sid) (id_elem sid')).