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--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "engraver-group.hh"
  10
  11 #include "warn.hh"
  12 #include "paper-score.hh"
  13 #include "grob.hh"
  14 #include "context.hh"
  15 #include "translator-dispatch-list.hh"
  16
  17 void
  18 Engraver_group::announce_grob (Grob_info info)
  19 {
  20   announce_infos_.push_back (info);
  21
  22   Engraver_group *dad_eng
  23     = context_->get_parent_context ()
  24     ? dynamic_cast<Engraver_group *> (context_->get_parent_context ()->implementation ())
  25     : 0;
  26
  27   if (dad_eng)
  28     dad_eng->announce_grob (info);
  29 }
  30
  31 void
  32 Engraver_group::acknowledge_grobs ()
  33 {
  34   if (!announce_infos_.size ())
  35     return;
  36
  37   SCM name_sym = ly_symbol2scm ("name");
  38   SCM meta_sym = ly_symbol2scm ("meta");
  39
  40   for (vsize j = 0; j < announce_infos_.size (); j++)
  41     {
  42       Grob_info info = announce_infos_[j];
  43
  44       SCM meta = info.grob ()->internal_get_property (meta_sym);
  45       SCM nm = scm_assoc (name_sym, meta);
  46       if (scm_is_pair (nm))
  47         nm = scm_cdr (nm);
  48       else
  49         continue;
  50
  51       SCM acklist = scm_hashq_ref (acknowledge_hash_table_drul_[info.start_end()],
  52                                    nm, SCM_BOOL_F);
  53
  54       Engraver_dispatch_list *dispatch
  55         = Engraver_dispatch_list::unsmob (acklist);
  56
  57       if (acklist == SCM_BOOL_F)
  58         {
  59           SCM ifaces
  60             = scm_cdr (scm_assoc (ly_symbol2scm ("interfaces"), meta));
  61           acklist = Engraver_dispatch_list::create (get_simple_trans_list (),
  62                                                     ifaces, info.start_end ());
  63
  64           dispatch
  65             = Engraver_dispatch_list::unsmob (acklist);
  66
  67           scm_hashq_set_x (acknowledge_hash_table_drul_[info.start_end ()], nm, acklist);
  68         }
  69
  70       if (dispatch)
  71         dispatch->apply (info);
  72     }
  73 }
  74
  75 /*
  76   Ugh. This is slightly expensive. We could/should cache the value of
  77   the group count?
  78 */
  79 int
  80 Engraver_group::pending_grob_count () const
  81 {
  82   int count = announce_infos_.size ();
  83   for (SCM s = context_->children_contexts ();
  84        scm_is_pair (s); s = scm_cdr (s))
  85     {
  86       Context *c = unsmob_context (scm_car (s));
  87       Engraver_group *group
  88         = dynamic_cast<Engraver_group *> (c->implementation ());
  89
  90       if (group)
  91         count += group->pending_grob_count ();
  92     }
  93   return count;
  94 }
  95
  96 void
  97 Engraver_group::do_announces ()
  98 {
  99   do
 100     {
 101       /*
 102         DOCME: why is this inside the loop?
 103        */
 104       for (SCM s = context ()->children_contexts ();
 105            scm_is_pair (s); s = scm_cdr (s))
 106         {
 107           Context *c = unsmob_context (scm_car (s));
 108           Engraver_group *group
 109             = dynamic_cast<Engraver_group *> (c->implementation ());
 110           if (group)
 111             group->do_announces ();
 112         }
 113
 114
 115       while (1)
 116         {
 117           precomputed_translator_foreach (PROCESS_ACKNOWLEDGED);
 118           if (announce_infos_.size () == 0)
 119             break;
 120
 121           acknowledge_grobs ();
 122           announce_infos_.clear ();
 123         }
 124     }
 125   while (pending_grob_count () > 0);
 126 }
 127
 128 Engraver_group::Engraver_group ()
 129 {
 130   acknowledge_hash_table_drul_[LEFT]
 131     = acknowledge_hash_table_drul_[RIGHT]
 132     = SCM_EOL;
 133
 134   acknowledge_hash_table_drul_[LEFT] = scm_c_make_hash_table (61);
 135   acknowledge_hash_table_drul_[RIGHT] = scm_c_make_hash_table (61);
 136 }
 137
 138 #include "translator.icc"
 139
 140 ADD_TRANSLATOR_GROUP (Engraver_group,
 141                       /* doc */ "A group of engravers taken together",
 142                       /* create */ "",
 143                       /* accept */ "",
 144                       /* read */ "",
 145                       /* write */ "");
 146
 147 void
 148 Engraver_group::derived_mark () const
 149 {
 150   scm_gc_mark (acknowledge_hash_table_drul_[LEFT]);
 151   scm_gc_mark (acknowledge_hash_table_drul_[RIGHT]);
 152 }