lily/folded-repeat-iterator.cc

   1 /*
   2      folded-repeat-iterator.cc --  implement Folded_repeat_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10
  11 /*
  12    Folded repeats are a stupid idea at this point, so we refrain from
  13    implementing get_pending_events () and skip ().
  14 */
  15
  16 #include "folded-repeat-iterator.hh"
  17 #include "repeated-music.hh"
  18 #include "music-list.hh"
  19 #include "simultaneous-music-iterator.hh"
  20 #include "translator-group.hh"
  21
  22 Folded_repeat_iterator::Folded_repeat_iterator ()
  23 {
  24   main_iter_ = 0;
  25   alternative_iter_ = 0;
  26 }
  27
  28 bool
  29 Folded_repeat_iterator::ok () const
  30 {
  31   return main_iter_ || alternative_iter_;
  32 }
  33 void
  34 Folded_repeat_iterator::do_quit()
  35 {
  36   if (main_iter_)main_iter_->quit();
  37   if (alternative_iter_)alternative_iter_->quit();
  38 }
  39
  40 Folded_repeat_iterator::Folded_repeat_iterator (Folded_repeat_iterator const &src)
  41   : Music_iterator (src)
  42 {
  43   main_iter_ = 0;
  44   alternative_iter_ = 0;
  45   main_length_mom_ = src.main_length_mom_;
  46
  47   if (src.alternative_iter_)
  48     alternative_iter_ = src.alternative_iter_->clone ();
  49   if (src.main_iter_)
  50     main_iter_ = src.main_iter_->clone ();
  51
  52   if (main_iter_)
  53     scm_gc_unprotect_object (main_iter_->self_scm());
  54   if (alternative_iter_)
  55     scm_gc_unprotect_object (alternative_iter_->self_scm());
  56 }
  57
  58 Moment
  59 Folded_repeat_iterator::pending_moment () const
  60 {
  61   if (main_iter_)
  62     {
  63       return main_iter_->pending_moment ();
  64     }
  65   else
  66     return main_length_mom_ + alternative_iter_->pending_moment ();
  67 }
  68
  69 void
  70 Folded_repeat_iterator::construct_children ()
  71 {
  72   Repeated_music  *  mus = dynamic_cast<Repeated_music*> (get_music ());
  73   main_iter_ = unsmob_iterator (get_iterator (mus->body ()));
  74   if (!main_iter_->ok ())
  75     {
  76       leave_body ();
  77       enter_alternative ();
  78     }
  79 }
  80
  81 void
  82 Folded_repeat_iterator::process (Moment m)
  83 {
  84   if (!m.to_bool () )
  85     {
  86       bool success = try_music (get_music ());
  87       if (!success)
  88         get_music ()->origin ()->warning (_ ("no one to print a repeat brace"));
  89     }
  90
  91   if (main_iter_)
  92     {
  93       main_iter_->process (m);
  94       if (!main_iter_->ok ())
  95         leave_body ();
  96     }
  97
  98   if (!main_iter_ && !alternative_iter_)
  99     {
 100       enter_alternative ();
 101     }
 102
 103   if (alternative_iter_)
 104     {
 105       alternative_iter_->process (m - main_length_mom_);
 106       if (!alternative_iter_->ok ())
 107         {
 108           alternative_iter_->quit();
 109           alternative_iter_ =0;
 110         }
 111     }
 112 }
 113
 114 void
 115 Folded_repeat_iterator::leave_body ()
 116 {
 117   Repeated_music *  mus = dynamic_cast<Repeated_music *> (get_music ());
 118
 119   main_iter_->quit ();
 120   main_iter_ = 0;
 121   main_length_mom_ +=  mus->body ()->length_mom ();
 122 }
 123
 124 void
 125 Folded_repeat_iterator::enter_alternative ()
 126 {
 127   Repeated_music *  mus = dynamic_cast<Repeated_music *> (get_music ());
 128   if (mus->alternatives ())
 129     {
 130   /*
 131     ugh.
 132    */
 133       Simultaneous_music_iterator * s = new Simultaneous_music_iterator;
 134       s->separate_contexts_b_ = true;
 135       s->init_translator (mus, report_to ());
 136
 137       alternative_iter_ = s;
 138       alternative_iter_->construct_children ();
 139
 140       scm_gc_unprotect_object (s->self_scm());
 141     }
 142 }
 143
 144
 145 Music_iterator*
 146 Folded_repeat_iterator::try_music_in_children (Music * m) const
 147 {
 148   if (main_iter_)
 149     {
 150       return main_iter_->try_music (m);
 151     }
 152   if (alternative_iter_)
 153     return alternative_iter_->try_music (m);
 154   return 0;
 155 }
 156 void
 157 Folded_repeat_iterator::derived_mark()const
 158 {
 159   if (main_iter_)
 160     scm_gc_mark (main_iter_->self_scm());
 161   if (alternative_iter_)
 162     scm_gc_mark (alternative_iter_->self_scm());
 163 }
 164 IMPLEMENT_CTOR_CALLBACK (Folded_repeat_iterator);