lily/engraver-group.cc

   1 /*
   2   engraver-group.cc -- implement Engraver_group
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "context.hh"
  10 #include "dispatcher.hh"
  11 #include "engraver-group.hh"
  12 #include "grob.hh"
  13 #include "paper-score.hh"
  14 #include "translator-dispatch-list.hh"
  15 #include "warn.hh"
  16
  17 IMPLEMENT_LISTENER (Engraver_group, override);
  18 void
  19 Engraver_group::override (SCM sev)
  20 {
  21   Stream_event *ev = unsmob_stream_event (sev);
  22
  23   sloppy_general_pushpop_property (context (),
  24                                    ev->get_property ("symbol"),
  25                                    ev->get_property ("property-path"),
  26                                    ev->get_property ("value"));
  27 }
  28
  29 IMPLEMENT_LISTENER (Engraver_group, revert);
  30 void
  31 Engraver_group::revert (SCM sev)
  32 {
  33   Stream_event *ev = unsmob_stream_event (sev);
  34
  35   sloppy_general_pushpop_property (context (),
  36                                    ev->get_property ("symbol"),
  37                                    ev->get_property ("property-path"),
  38                                    SCM_UNDEFINED);
  39 }
  40
  41 void
  42 Engraver_group::connect_to_context (Context *c)
  43 {
  44   Translator_group::connect_to_context (c);
  45   c->event_source ()->add_listener (GET_LISTENER (override), ly_symbol2scm ("Override"));
  46   c->event_source ()->add_listener (GET_LISTENER (revert), ly_symbol2scm ("Revert"));
  47 }
  48
  49 void
  50 Engraver_group::disconnect_from_context ()
  51 {
  52   context ()->event_source ()->remove_listener (GET_LISTENER (override), ly_symbol2scm ("Override"));
  53   context ()->event_source ()->remove_listener (GET_LISTENER (revert), ly_symbol2scm ("Revert"));
  54   Translator_group::disconnect_from_context ();
  55 }
  56
  57 void
  58 Engraver_group::announce_grob (Grob_info info)
  59 {
  60   announce_infos_.push_back (info);
  61
  62   Engraver_group *dad_eng
  63     = context_->get_parent_context ()
  64     ? dynamic_cast<Engraver_group *> (context_->get_parent_context ()->implementation ())
  65     : 0;
  66
  67   if (dad_eng)
  68     dad_eng->announce_grob (info);
  69 }
  70
  71 void
  72 Engraver_group::acknowledge_grobs ()
  73 {
  74   if (!announce_infos_.size ())
  75     return;
  76
  77   SCM name_sym = ly_symbol2scm ("name");
  78   SCM meta_sym = ly_symbol2scm ("meta");
  79
  80   for (vsize j = 0; j < announce_infos_.size (); j++)
  81     {
  82       Grob_info info = announce_infos_[j];
  83
  84       SCM meta = info.grob ()->internal_get_property (meta_sym);
  85       SCM nm = scm_assoc (name_sym, meta);
  86       if (scm_is_pair (nm))
  87         nm = scm_cdr (nm);
  88       else
  89         continue;
  90
  91       SCM acklist = scm_hashq_ref (acknowledge_hash_table_drul_[info.start_end ()],
  92                                    nm, SCM_BOOL_F);
  93
  94       Engraver_dispatch_list *dispatch
  95         = Engraver_dispatch_list::unsmob (acklist);
  96
  97       if (acklist == SCM_BOOL_F)
  98         {
  99           SCM ifaces
 100             = scm_cdr (scm_assoc (ly_symbol2scm ("interfaces"), meta));
 101           acklist = Engraver_dispatch_list::create (get_simple_trans_list (),
 102                                                     ifaces, info.start_end ());
 103
 104           dispatch
 105             = Engraver_dispatch_list::unsmob (acklist);
 106
 107           scm_hashq_set_x (acknowledge_hash_table_drul_[info.start_end ()], nm, acklist);
 108         }
 109
 110       if (dispatch)
 111         dispatch->apply (info);
 112     }
 113 }
 114
 115 /*
 116   Ugh. This is slightly expensive. We could/should cache the value of
 117   the group count?
 118 */
 119 int
 120 Engraver_group::pending_grob_count () const
 121 {
 122   int count = announce_infos_.size ();
 123   for (SCM s = context_->children_contexts ();
 124        scm_is_pair (s); s = scm_cdr (s))
 125     {
 126       Context *c = unsmob_context (scm_car (s));
 127       Engraver_group *group
 128         = dynamic_cast<Engraver_group *> (c->implementation ());
 129
 130       if (group)
 131         count += group->pending_grob_count ();
 132     }
 133   return count;
 134 }
 135
 136 void
 137 Engraver_group::do_announces ()
 138 {
 139   do
 140     {
 141       /*
 142         DOCME: why is this inside the loop?
 143        */
 144       for (SCM s = context ()->children_contexts ();
 145            scm_is_pair (s); s = scm_cdr (s))
 146         {
 147           Context *c = unsmob_context (scm_car (s));
 148           Engraver_group *group
 149             = dynamic_cast<Engraver_group *> (c->implementation ());
 150           if (group)
 151             group->do_announces ();
 152         }
 153
 154
 155       while (1)
 156         {
 157           precomputed_translator_foreach (PROCESS_ACKNOWLEDGED);
 158           if (announce_infos_.size () == 0)
 159             break;
 160
 161           acknowledge_grobs ();
 162           announce_infos_.clear ();
 163         }
 164     }
 165   while (pending_grob_count () > 0);
 166 }
 167
 168 Engraver_group::Engraver_group ()
 169 {
 170   acknowledge_hash_table_drul_[LEFT]
 171     = acknowledge_hash_table_drul_[RIGHT]
 172     = SCM_EOL;
 173
 174   acknowledge_hash_table_drul_[LEFT] = scm_c_make_hash_table (61);
 175   acknowledge_hash_table_drul_[RIGHT] = scm_c_make_hash_table (61);
 176 }
 177
 178 #include "translator.icc"
 179
 180 ADD_TRANSLATOR_GROUP (Engraver_group,
 181                       /* doc */
 182                       "A group of engravers taken together.",
 183
 184                       /* create */
 185                       "",
 186
 187                       /* read */
 188                       "",
 189
 190                       /* write */
 191                       ""
 192                       );
 193
 194 void
 195 Engraver_group::derived_mark () const
 196 {
 197   scm_gc_mark (acknowledge_hash_table_drul_[LEFT]);
 198   scm_gc_mark (acknowledge_hash_table_drul_[RIGHT]);
 199 }