lily/engraver-group-engraver.cc

   1 /*
   2   engraver-group-engraver.cc -- implement Engraver_group_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "flower-proto.hh"
  10 #include "engraver-group-engraver.hh"
  11 #include "engraver.hh"
  12 #include "warn.hh"
  13 #include "paper-score.hh"
  14 #include "grob.hh"
  15 #include "context.hh"
  16
  17
  18
  19 void
  20 Engraver_group_engraver::announce_grob (Grob_info info)
  21 {
  22   announce_infos_.push (info);
  23   get_daddy_engraver ()->announce_grob (info);
  24 }
  25
  26
  27 SCM find_acknowledge_engravers (SCM gravlist, SCM meta);
  28 SCM find_accept_engravers (SCM gravlist, SCM music_descr);
  29
  30 void
  31 Engraver_group_engraver::acknowledge_grobs ()
  32 {
  33   if (!announce_infos_.size ())
  34     return ;
  35
  36   SCM tab = get_property ("acknowledgeHashTable");
  37   SCM name_sym = ly_symbol2scm ("name");
  38   SCM meta_sym = ly_symbol2scm ("meta");
  39
  40
  41   for (int j =0; j < announce_infos_.size (); j++)
  42     {
  43       Grob_info info = announce_infos_[j];
  44
  45       SCM meta = info.grob_->internal_get_property (meta_sym);
  46       SCM nm = scm_assoc (name_sym, meta);
  47       if (ly_c_pair_p (nm))
  48         nm = ly_cdr (nm);
  49       else
  50         {
  51           /*
  52             it's tempting to put an assert for
  53             immutable_property_alist_ == '(), but in fact, some
  54             engravers (clef-engraver) add some more information to the
  55             immutable_property_alist_ (after it has been '()-ed).
  56
  57             We ignore the grob anyway. He who has no name, shall not
  58             be helped.  */
  59
  60           continue;
  61         }
  62
  63       SCM acklist = scm_hashq_ref (tab, nm, SCM_UNDEFINED);
  64       if (acklist == SCM_BOOL_F)
  65         {
  66           acklist = find_acknowledge_engravers (scm_cons (self_scm (), get_simple_trans_list ()), meta);
  67           scm_hashq_set_x (tab, nm, acklist);
  68         }
  69
  70       for (SCM p = acklist; ly_c_pair_p (p); p = ly_cdr (p))
  71         {
  72           Translator * t = unsmob_translator (ly_car (p));
  73           Engraver * eng = dynamic_cast<Engraver*> (t);
  74           if (eng && eng != info.origin_trans_)
  75             eng->acknowledge_grob (info);
  76         }
  77     }
  78 }
  79
  80
  81 void
  82 Engraver_group_engraver::do_announces ()
  83 {
  84   do
  85     {
  86       engraver_each (get_simple_trans_list (),
  87                      &Engraver::process_acknowledged_grobs);
  88
  89       if (!announce_infos_.size ())
  90         break;
  91
  92       acknowledge_grobs ();
  93       announce_infos_.clear ();
  94     }
  95   while (1);
  96 }
  97
  98
  99
 100 void
 101 Engraver_group_engraver::initialize ()
 102 {
 103   SCM tab = scm_make_vector (scm_int2num (61), SCM_BOOL_F);
 104   context ()->set_property ("acknowledgeHashTable", tab);
 105
 106   Translator_group::initialize ();
 107 }
 108
 109 Engraver_group_engraver::Engraver_group_engraver () {}
 110
 111 ENTER_DESCRIPTION (Engraver_group_engraver,
 112 /* descr */       "A group of engravers taken together",
 113 /* creats*/       "",
 114 /* accepts */     "",
 115 /* acks  */      "",
 116 /* reads */       "",
 117 /* write */       "");
 118
 119
 120
 121 /*****************/
 122
 123
 124 bool
 125 engraver_valid (Translator*tr, SCM ifaces)
 126 {
 127   SCM ack_ifs = scm_assoc (ly_symbol2scm ("interfaces-acked"), tr->translator_description ());
 128   ack_ifs = ly_cdr (ack_ifs);
 129   for (SCM s = ifaces; ly_c_pair_p (s); s = ly_cdr (s))
 130     if (scm_c_memq (ly_car (s), ack_ifs) != SCM_BOOL_F)
 131       return true;
 132   return false;
 133 }
 134
 135
 136
 137 SCM
 138 find_acknowledge_engravers (SCM gravlist, SCM meta_alist)
 139 {
 140   SCM ifaces = ly_cdr (scm_assoc (ly_symbol2scm ("interfaces"), meta_alist));
 141
 142   SCM l = SCM_EOL;
 143   for (SCM s = gravlist; ly_c_pair_p (s);  s = ly_cdr (s))
 144     {
 145       Translator* tr = unsmob_translator (ly_car (s));
 146       if (engraver_valid (tr, ifaces))
 147         l = scm_cons (tr->self_scm (), l);
 148     }
 149   l = scm_reverse_x (l, SCM_EOL);
 150
 151   return l;
 152 }
 153
 154
 155 /* c&p engraver-group.cc */
 156 void
 157 recurse_down_engravers (Context * c, Engraver_method ptr, bool context_first)
 158 {
 159   Engraver_group_engraver * tg
 160     = dynamic_cast<Engraver_group_engraver*> (c->implementation ());
 161
 162
 163   if (!context_first)
 164     {
 165       engraver_each (tg->get_simple_trans_list (),
 166                      ptr);
 167
 168       (tg->*ptr) ();
 169     }
 170
 171   for (SCM s = c->children_contexts () ; ly_c_pair_p (s);
 172        s =ly_cdr (s))
 173     {
 174       recurse_down_engravers (unsmob_context (ly_car (s)), ptr, context_first);
 175     }
 176
 177   if (context_first)
 178     {
 179       engraver_each (tg->get_simple_trans_list (),
 180                      ptr);
 181       (tg->*ptr) ();
 182     }
 183 }
 184
 185
 186 void
 187 engraver_each (SCM list, Engraver_method method)
 188 {
 189   for (SCM p = list; ly_c_pair_p (p); p = ly_cdr (p))
 190     {
 191       Engraver * e = dynamic_cast<Engraver*>(unsmob_translator (ly_car (p)));
 192       if (e)
 193         (e->*method) ();
 194     }
 195 }