lily/folded-repeat-iterator.cc

   1 /*
   2   repeated-music-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
  34 Folded_repeat_iterator::~Folded_repeat_iterator ()
  35 {
  36   delete main_iter_;
  37   delete alternative_iter_;
  38 }
  39
  40 Folded_repeat_iterator::Folded_repeat_iterator (Folded_repeat_iterator const &src)
  41   : Music_iterator (src)
  42 {
  43   main_iter_ = src.main_iter_ ? src.main_iter_->clone () : 0;
  44   alternative_iter_ = src.alternative_iter_ ? src.alternative_iter_->clone () : 0;
  45   main_length_mom_ = src.main_length_mom_;
  46 }
  47
  48 Moment
  49 Folded_repeat_iterator::pending_moment () const
  50 {
  51   if (main_iter_)
  52     {
  53       return main_iter_->pending_moment ();
  54     }
  55   else
  56     return main_length_mom_ + alternative_iter_->pending_moment ();
  57 }
  58
  59 void
  60 Folded_repeat_iterator::construct_children ()
  61 {
  62   Repeated_music  *  mus = dynamic_cast<Repeated_music*> (get_music ());
  63   main_iter_ = get_iterator (mus->body ());
  64   if (!main_iter_->ok ())
  65     {
  66      leave_body ();
  67       enter_alternative ();
  68     }
  69 }
  70
  71 void
  72 Folded_repeat_iterator::process (Moment m)
  73 {
  74   if (!m.to_bool () )
  75     {
  76       bool success = try_music (get_music ());
  77       if (!success)
  78         get_music ()->origin ()->warning (_ ("no one to print a repeat brace"));
  79     }
  80
  81   if (main_iter_)
  82     {
  83       main_iter_->process (m);
  84       if (!main_iter_->ok ())
  85         leave_body ();
  86     }
  87
  88   if (!main_iter_ && !alternative_iter_)
  89     {
  90       enter_alternative ();
  91     }
  92
  93   if (alternative_iter_)
  94     {
  95       alternative_iter_->process (m - main_length_mom_);
  96       if (!alternative_iter_->ok ())
  97         {
  98           delete alternative_iter_;
  99           alternative_iter_ =0;
 100         }
 101     }
 102 }
 103
 104 void
 105 Folded_repeat_iterator::leave_body ()
 106 {
 107   Repeated_music *  mus = dynamic_cast<Repeated_music *> (get_music ());
 108   delete main_iter_;
 109   main_iter_ = 0;
 110   main_length_mom_ +=  mus->body ()->length_mom ();
 111 }
 112
 113 void
 114 Folded_repeat_iterator::enter_alternative ()
 115 {
 116   Repeated_music *  mus = dynamic_cast<Repeated_music *> (get_music ());
 117   if (mus->alternatives ())
 118     {
 119       Simultaneous_music_iterator * s = new Simultaneous_music_iterator;
 120       s->separate_contexts_b_ = true;
 121       s->init_translator (mus, report_to ());
 122
 123       alternative_iter_ = s;
 124       alternative_iter_->construct_children ();
 125     }
 126 }
 127
 128
 129 Music_iterator*
 130 Folded_repeat_iterator::try_music_in_children (Music * m) const
 131 {
 132   if (main_iter_)
 133     {
 134       return main_iter_->try_music (m);
 135     }
 136   if (alternative_iter_)
 137     return alternative_iter_->try_music (m);
 138   return 0;
 139 }
 140
 141 IMPLEMENT_CTOR_CALLBACK (Folded_repeat_iterator);