lily/change-iterator.cc

   1 /*
   2   change-iterator.cc -- implement Change_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "change-iterator.hh"
  10 #include "translator-group.hh"
  11 #include "music.hh"
  12 #include "debug.hh"
  13
  14
  15 void
  16 Change_iterator::error (String reason)
  17 {
  18   String to_type = ly_scm2string (music_l_->get_mus_property ("change-to-type"));
  19   String to_id =  ly_scm2string (music_l_->get_mus_property ("change-to-id"));
  20
  21   String warn1 = _f ("can't change `%s' to `%s'", to_type, to_id)
  22     + ": " + reason;
  23   /*
  24     GUHG!
  25    */
  26   String warn2= "Change_iterator::process (): "
  27     + report_to_l ()->type_str_ + " = `"
  28     + report_to_l ()->id_str_ + "': ";
  29   warning (warn2);
  30   music_l_->origin ()->warning (warn1);
  31 }
  32
  33 /*
  34   move to construct_children ?
  35  */
  36 void
  37 Change_iterator::process (Moment m)
  38 {
  39   Translator_group * current = report_to_l ();
  40   Translator_group * last = 0;
  41
  42   String to_type = ly_scm2string (music_l_->get_mus_property ("change-to-type"));
  43   String to_id =  ly_scm2string (music_l_->get_mus_property ("change-to-id"));
  44
  45
  46   /* find the type  of translator that we're changing.
  47
  48      If \translator Staff = bass, then look for Staff = *
  49    */
  50   while (current && current->type_str_ != to_type)
  51     {
  52       last = current;
  53       current = current->daddy_trans_l_;
  54     }
  55
  56   if (current && current->id_str_ == to_id)
  57     {
  58       String msg;
  59       msg += _ ("Can't switch translators, I'm there already");
  60     }
  61
  62   if (current)
  63     if (last)
  64       {
  65         Translator_group * dest =
  66           report_to_l ()->find_create_translator_l (to_type, to_id);
  67         current->remove_translator_p (last);
  68         dest->add_group_translator (last);
  69       }
  70     else
  71       {
  72         /*
  73           We could change the current translator's id, but that would make
  74           errors hard to catch
  75
  76            last->translator_id_str_  = change_l ()->change_to_id_str_;
  77         */
  78         error (_ ("I'm one myself"));
  79       }
  80   else
  81     error (_ ("none of these in my family"));
  82   Simple_music_iterator::process (m);
  83 }
  84
  85
  86
  87 IMPLEMENT_CTOR_CALLBACK (Change_iterator);