lily/music-iterator.cc

   1 /*
   2   music-iterator.cc -- implement Music_iterator
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 /*
  10   UGH. too many includes.
  11  */
  12 #include "warn.hh"
  13 #include "music-iterator.hh"
  14 #include "translator-group.hh"
  15 #include "music-wrapper.hh"
  16 #include "music-wrapper-iterator.hh"
  17 #include "simple-music-iterator.hh"
  18 #include "ly-smobs.icc"
  19
  20 #include "ly-smobs.icc"
  21
  22 Music_iterator::Music_iterator ()
  23 {
  24   music_ = 0;
  25   smobify_self ();
  26 }
  27
  28 Music_iterator::Music_iterator (Music_iterator const& src)
  29 {
  30   handle_ = *src.handle_.clone ();
  31   music_ = src.music_;
  32   music_length_ = src.music_length_;
  33   start_mom_ = src.start_mom_;
  34   smobify_self ();
  35 }
  36
  37 Music_iterator::~Music_iterator ()
  38 {
  39 }
  40
  41 Translator_group*
  42 Music_iterator::report_to () const
  43 {
  44   return handle_.report_to ();
  45 }
  46
  47 void
  48 Music_iterator::set_translator (Translator_group *trans)
  49 {
  50   handle_.set_translator (trans);
  51 }
  52
  53 void
  54 Music_iterator::construct_children ()
  55 {
  56 }
  57
  58 Moment
  59 Music_iterator::pending_moment () const
  60 {
  61   return 0;
  62 }
  63
  64 void
  65 Music_iterator::process (Moment)
  66 {
  67 }
  68
  69 bool
  70 Music_iterator::ok () const
  71 {
  72   return false;
  73 }
  74
  75 void
  76 Music_iterator::skip (Moment)
  77 {
  78 }
  79
  80 SCM
  81 Music_iterator::get_pending_events (Moment)const
  82 {
  83   return SCM_EOL;
  84 }
  85
  86 SCM
  87 Music_iterator::get_static_get_iterator (Music *m)
  88 {
  89   Music_iterator * p =0;
  90
  91   SCM ctor = m->get_mus_property ("iterator-ctor") ;
  92   SCM iter = SCM_EOL;
  93   if (gh_procedure_p (ctor))
  94     {
  95       iter = gh_call0 (ctor);
  96       p = unsmob_iterator (iter);
  97     }
  98   else
  99     {
 100       if (dynamic_cast<Music_wrapper *> (m))
 101         p = new Music_wrapper_iterator;
 102       else
 103         p = new Simple_music_iterator;
 104
 105       iter = p->self_scm();
 106       scm_gc_unprotect_object (iter);
 107     }
 108
 109   p->music_ = m;
 110   assert (m);
 111   p->music_length_ = m->get_length ();
 112   p->start_mom_ = m->start_mom ();
 113   return iter;
 114 }
 115
 116
 117 Moment
 118 Music_iterator::music_get_length () const
 119 {
 120   return music_length_;
 121 }
 122
 123 Moment
 124 Music_iterator::music_start_mom ()const
 125 {
 126   return start_mom_;
 127 }
 128
 129 void
 130 Music_iterator::init_translator (Music *m, Translator_group *report)
 131 {
 132   music_ = m;
 133   assert (m);
 134   if (! report_to ())
 135     set_translator (report);
 136 }
 137
 138
 139 SCM
 140 Music_iterator::get_iterator (Music *m) const
 141 {
 142   SCM ip = get_static_get_iterator (m);
 143   Music_iterator*p = unsmob_iterator (ip);
 144
 145   p->init_translator (m, report_to ());
 146
 147   p->construct_children ();
 148   return ip;
 149 }
 150
 151 /*
 152   TODO: rename to prevent confusion between Translator::try_music and
 153   Iterator::try_music
 154
 155  */
 156 Music_iterator*
 157 Music_iterator::try_music (Music *m) const
 158 {
 159   bool b = report_to ()->try_music ((Music*)m); // ugh
 160   Music_iterator * it = b ? (Music_iterator*) this : 0; // ugh
 161   if (!it)
 162     it = try_music_in_children (m);
 163   return it;
 164 }
 165
 166 Music_iterator*
 167 Music_iterator::try_music_in_children (Music *) const
 168 {
 169   return 0;
 170 }
 171
 172 IMPLEMENT_CTOR_CALLBACK (Music_iterator);
 173
 174 Music *
 175 Music_iterator::get_music () const
 176 {
 177   return music_;
 178 }
 179
 180 /****************************************************************/
 181
 182 IMPLEMENT_TYPE_P (Music_iterator, "ly:iterator?");
 183 IMPLEMENT_SMOBS(Music_iterator);
 184 IMPLEMENT_DEFAULT_EQUAL_P(Music_iterator);
 185
 186 SCM
 187 Music_iterator::mark_smob (SCM smob)
 188 {
 189   Music_iterator * mus = (Music_iterator *)SCM_CELL_WORD_1 (smob);
 190
 191   mus->derived_mark ();
 192   /*
 193     Careful with GC, although we intend the following as pointers
 194     only, we _must_ mark them.
 195    */
 196   if (mus->report_to())
 197     scm_gc_mark (mus->report_to()->self_scm());
 198   if (mus->music_)
 199     scm_gc_mark (mus->music_->self_scm());
 200
 201
 202   return SCM_EOL;
 203 }
 204
 205 int
 206 Music_iterator::print_smob (SCM , SCM port, scm_print_state*)
 207 {
 208   scm_puts ("#<Music iterator>", port);
 209   return 1;
 210 }
 211
 212 void
 213 Music_iterator::derived_mark()const
 214 {
 215 }
 216
 217 void
 218 Music_iterator::quit ()
 219 {
 220   do_quit ();
 221   handle_.quit ();
 222 }
 223
 224 void
 225 Music_iterator::do_quit()
 226 {
 227 }