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 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include "change-iterator.hh"
  10 #include "translator-group.hh"
  11 #include "change-translator.hh"
  12 #include "debug.hh"
  13
  14 Change_iterator::Change_iterator (Change_translator *change_l)
  15 {
  16   change_l_ = change_l;
  17 }
  18
  19 void
  20 Change_iterator::error (String reason)
  21 {
  22   String to_type = change_l_->change_to_type_str_;
  23   String to_id =  change_l_->change_to_id_str_;
  24
  25   String warn1 =
  26     _ ("Can't change ") + to_type
  27     + _(" to ") + "`" + to_id + "\': " + reason;
  28   String warn2= "Change_iterator::process_and_next (): " + report_to_l ()->type_str_ + " = `"
  29     + report_to_l ()->id_str_ + "\': ";
  30   warning (warn2);
  31   change_l_->warning (warn1);
  32 }
  33
  34 /*
  35   move to construct_children ?
  36  */
  37 void
  38 Change_iterator::process_and_next (Moment m)
  39 {
  40   Translator_group * current = report_to_l ();
  41   Translator_group * last = 0;
  42
  43   String to_type = change_l_->change_to_type_str_;
  44   String to_id =  change_l_->change_to_id_str_;
  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
  57   if (current)
  58     if (last)
  59       {
  60         Translator_group * dest =
  61           report_to_l ()->find_create_translator_l (to_type, to_id);
  62         current->remove_translator_p (last);
  63         dest->add (last);
  64       }
  65     else
  66       {
  67
  68         /*
  69           We could change the current translator's id, but that would make
  70           errors hard to catch
  71
  72            last->translator_id_str_  = change_l_->change_to_id_str_;
  73         */
  74         error ("I'm one myself");
  75       }
  76   else
  77     error ("None of these in my family.");
  78   Music_iterator::process_and_next (m);
  79 }
  80
  81 IMPLEMENT_IS_TYPE_B1 (Change_iterator, Music_iterator);