lily/translator-ctors.cc

   1 /*
   2   translator-ctors.cc -- implement Translator construction
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "translator.hh"
  10
  11 #include "international.hh"
  12 #include "scm-hash.hh"
  13 #include "warn.hh"
  14
  15 /*
  16   should delete these after exit.
  17 */
  18
  19 Scheme_hash_table *global_translator_dict = 0;
  20
  21 LY_DEFINE (get_all_translators, "ly:get-all-translators", 0, 0, 0, (),
  22            "Return a list of all translator objects that may be"
  23            " instantiated.")
  24 {
  25   SCM l = global_translator_dict ? global_translator_dict->to_alist () : SCM_EOL;
  26
  27   for (SCM s = l; scm_is_pair (s); s = scm_cdr (s))
  28     scm_set_car_x (s, scm_cdar (s));
  29
  30   return l;
  31 }
  32
  33 void
  34 add_translator (Translator *t)
  35 {
  36   if (!global_translator_dict)
  37     global_translator_dict = new Scheme_hash_table;
  38
  39   SCM k = ly_symbol2scm (t->class_name ());
  40   global_translator_dict->set (k, t->self_scm ());
  41
  42   t->unprotect ();
  43 }
  44
  45 Translator *
  46 get_translator (SCM sym)
  47 {
  48   SCM v = SCM_BOOL_F;
  49   if (global_translator_dict)
  50     global_translator_dict->try_retrieve (sym, &v);
  51
  52   if (v == SCM_BOOL_F)
  53     error (_f ("unknown translator: `%s'", ly_symbol2string (sym).c_str ()));
  54
  55   return unsmob_translator (v);
  56 }
  57