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--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "folded-repeat-iterator.hh"
  10
  11 #include "input.hh"
  12 #include "repeated-music.hh"
  13 #include "simultaneous-music-iterator.hh"
  14 #include "context.hh"
  15
  16 Folded_repeat_iterator::Folded_repeat_iterator ()
  17 {
  18   main_iter_ = 0;
  19   alternative_iter_ = 0;
  20 }
  21
  22 bool
  23 Folded_repeat_iterator::ok () const
  24 {
  25   return main_iter_ || alternative_iter_;
  26 }
  27 void
  28 Folded_repeat_iterator::do_quit ()
  29 {
  30   if (main_iter_)main_iter_->quit ();
  31   if (alternative_iter_)alternative_iter_->quit ();
  32 }
  33
  34 Moment
  35 Folded_repeat_iterator::pending_moment () const
  36 {
  37   if (main_iter_)
  38     return main_iter_->pending_moment ();
  39   else
  40     return main_length_mom_ + alternative_iter_->pending_moment ();
  41 }
  42
  43 void
  44 Folded_repeat_iterator::construct_children ()
  45 {
  46   Music *mus = get_music ();
  47   main_iter_ = unsmob_iterator (get_iterator (Repeated_music::body (mus)));
  48   if (!main_iter_->ok ())
  49     {
  50       leave_body ();
  51       enter_alternative ();
  52     }
  53 }
  54
  55 void
  56 Folded_repeat_iterator::process (Moment m)
  57 {
  58   if (!m.to_bool ())
  59     {
  60       bool success = try_music (get_music ());
  61       if (!success)
  62         get_music ()->origin ()->warning (_ ("no one to print a repeat brace"));
  63     }
  64
  65   if (main_iter_)
  66     {
  67       main_iter_->process (m);
  68       if (!main_iter_->ok ())
  69         leave_body ();
  70     }
  71
  72   if (!main_iter_ && !alternative_iter_)
  73     enter_alternative ();
  74
  75   if (alternative_iter_)
  76     {
  77       alternative_iter_->process (m - main_length_mom_);
  78       if (!alternative_iter_->ok ())
  79         {
  80           alternative_iter_->quit ();
  81           alternative_iter_ = 0;
  82         }
  83     }
  84 }
  85
  86 void
  87 Folded_repeat_iterator::leave_body ()
  88 {
  89   Music *mus = get_music ();
  90
  91   main_iter_->quit ();
  92   main_iter_ = 0;
  93   main_length_mom_ += Repeated_music::body (mus)->get_length ();
  94 }
  95
  96 void
  97 Folded_repeat_iterator::enter_alternative ()
  98 {
  99   Music *mus = get_music ();
 100   if (scm_is_pair (Repeated_music::alternatives (mus)))
 101     {
 102       /*
 103         ugh.
 104       */
 105       Simultaneous_music_iterator *s = new Simultaneous_music_iterator;
 106       s->create_separate_contexts_ = true;
 107       s->init_translator (mus, get_outlet ());
 108
 109       alternative_iter_ = s;
 110       alternative_iter_->construct_children ();
 111
 112       s->unprotect ();
 113     }
 114 }
 115
 116 Music_iterator *
 117 Folded_repeat_iterator::try_music_in_children (Music *m) const
 118 {
 119   if (main_iter_)
 120     return main_iter_->try_music (m);
 121   if (alternative_iter_)
 122     return alternative_iter_->try_music (m);
 123   return 0;
 124 }
 125 void
 126 Folded_repeat_iterator::derived_mark () const
 127 {
 128   if (main_iter_)
 129     scm_gc_mark (main_iter_->self_scm ());
 130   if (alternative_iter_)
 131     scm_gc_mark (alternative_iter_->self_scm ());
 132 }
 133
 134 void
 135 Folded_repeat_iterator::derived_substitute (Context *f, Context *t)
 136 {
 137   if (main_iter_)
 138     main_iter_->substitute_outlet (f, t);
 139   if (alternative_iter_)
 140     alternative_iter_->substitute_outlet (f, t);
 141 }
 142
 143 IMPLEMENT_CTOR_CALLBACK (Folded_repeat_iterator);