lily/translator-ctors.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "translator.hh"
  21
  22 #include "international.hh"
  23 #include "scm-hash.hh"
  24 #include "warn.hh"
  25
  26 /*
  27   should delete these after exit.
  28 */
  29
  30 Scheme_hash_table *global_translator_dict = 0;
  31
  32 LY_DEFINE (get_all_translators, "ly:get-all-translators", 0, 0, 0, (),
  33            "Return a list of all translator objects that may be"
  34            " instantiated.")
  35 {
  36   SCM l = global_translator_dict ? global_translator_dict->to_alist () : SCM_EOL;
  37
  38   for (SCM s = l; scm_is_pair (s); s = scm_cdr (s))
  39     scm_set_car_x (s, scm_cdar (s));
  40
  41   return l;
  42 }
  43
  44 void
  45 add_translator (Translator *t)
  46 {
  47   if (!global_translator_dict)
  48     global_translator_dict = new Scheme_hash_table;
  49
  50   SCM k = ly_symbol2scm (t->class_name ());
  51   global_translator_dict->set (k, t->self_scm ());
  52
  53   t->unprotect ();
  54 }
  55
  56 Translator *
  57 get_translator (SCM sym)
  58 {
  59   SCM v = SCM_BOOL_F;
  60   if (global_translator_dict)
  61     global_translator_dict->try_retrieve (sym, &v);
  62
  63   if (v == SCM_BOOL_F)
  64     {
  65       warning (_f ("unknown translator: `%s'", ly_symbol2string (sym).c_str ()));
  66       return 0;
  67     }
  68
  69   return unsmob_translator (v);
  70 }
  71