lily/slur-engraver.cc

   1 /*
   2   slur-engraver.cc -- implement Slur_engraver
   3
   4   (c)  1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   5 */
   6
   7 #include "event.hh"
   8 #include "slur.hh"
   9 #include "warn.hh"
  10 #include "note-column.hh"
  11 #include "translator-group.hh"
  12 #include "engraver.hh"
  13 #include "spanner.hh"
  14
  15 /*
  16   TODO: junk nested slur functionality.
  17  */
  18 class Slur_engraver : public Engraver
  19 {
  20   Link_array<Music> events_;
  21   Link_array<Music> new_slur_evs_;
  22   Link_array<Grob> slur_stack_;
  23   Link_array<Grob> end_slurs_;
  24   Moment last_start_;
  25
  26   void set_melisma (bool);
  27
  28 protected:
  29   virtual bool try_music (Music*);
  30   virtual void acknowledge_grob (Grob_info);
  31   virtual void stop_translation_timestep ();
  32   virtual void start_translation_timestep ();
  33   virtual void finalize ();
  34   virtual void process_acknowledged_grobs ();
  35
  36 public:
  37   TRANSLATOR_DECLARATIONS (Slur_engraver);
  38 };
  39
  40 Slur_engraver::Slur_engraver ()
  41 {
  42   last_start_ = Moment (-1);
  43 }
  44
  45 bool
  46 Slur_engraver::try_music (Music *ev)
  47 {
  48   if (ev->is_mus_type ("abort-event"))
  49     {
  50       for (int i = 0; i < slur_stack_.size (); i++)
  51         {
  52           slur_stack_[i]->suicide ();
  53         }
  54       slur_stack_.clear ();
  55       for (int i = 0; i < end_slurs_.size (); i++)
  56         {
  57           end_slurs_[i]->suicide ();
  58         }
  59       end_slurs_.clear ();
  60       events_.clear ();
  61       new_slur_evs_.clear ();
  62     }
  63   else if (ev->is_mus_type ("slur-event"))
  64     {
  65       /*
  66         Let's not start more than one slur per moment.
  67       */
  68       Direction d = to_dir (ev->get_mus_property ("span-direction"));
  69       if (d == START)
  70         {
  71           if (now_mom () > last_start_)
  72             {
  73               new_slur_evs_.push (ev);
  74               last_start_ = now_mom ();
  75             }
  76
  77           /*
  78             But we swallow other slur events.
  79           */
  80
  81           return true;
  82
  83         }
  84       else if (d == STOP)
  85         {
  86           /*
  87             Swallow other events.
  88           */
  89           for (int j = new_slur_evs_.size(); j--;)
  90             {
  91               Direction nd = to_dir (new_slur_evs_[j]->get_mus_property ("span-direction"));
  92
  93               if (nd == STOP)
  94                 return true;
  95             }
  96
  97           new_slur_evs_.push (ev);
  98           return true;
  99         }
 100     }
 101   return false;
 102 }
 103
 104 void
 105 Slur_engraver::set_melisma (bool m)
 106 {
 107   daddy_trans_->set_property ("slurMelismaBusy", m ? SCM_BOOL_T :SCM_BOOL_F);
 108 }
 109
 110 void
 111 Slur_engraver::acknowledge_grob (Grob_info info)
 112 {
 113   if (Note_column::has_interface (info.grob_))
 114     {
 115       Grob *e =info.grob_;
 116       for (int i = 0; i < slur_stack_.size (); i++)
 117         Slur::add_column (slur_stack_[i], e);
 118       for (int i = 0; i < end_slurs_.size (); i++)
 119         Slur::add_column (end_slurs_[i], e);
 120     }
 121 }
 122
 123 void
 124 Slur_engraver::finalize ()
 125 {
 126   for (int i = 0; i < slur_stack_.size (); i++)
 127     {
 128 #if 0
 129       typeset_grob (slur_stack_[i]);
 130 #else
 131       /*
 132         Let's not typeset unterminated stuff
 133        */
 134       slur_stack_[i]->suicide ();
 135 #endif
 136     }
 137   slur_stack_.clear ();
 138
 139   for (int i=0; i < events_.size (); i++)
 140       {
 141         events_[i]->origin ()->warning (_ ("unterminated slur"));
 142       }
 143 }
 144
 145 void
 146 Slur_engraver::process_acknowledged_grobs ()
 147 {
 148   Link_array<Grob> start_slurs;
 149   for (int i=0; i< new_slur_evs_.size (); i++)
 150     {
 151       Music* slur_ev = new_slur_evs_[i];
 152       // end slur: move the slur to other array
 153       Direction d = to_dir (slur_ev->get_mus_property ("span-direction"));
 154       if (d== STOP)
 155         {
 156           if (slur_stack_.empty ())
 157             /* How to shut up this warning, when Voice_devnull_engraver has
 158                eaten start event? */
 159             slur_ev->origin ()->warning (_f ("can't find start of slur"));
 160           else
 161             {
 162               Grob* slur = slur_stack_.pop ();
 163
 164               end_slurs_.push (slur);
 165               events_.pop ();
 166             }
 167         }
 168       else  if (d == START)
 169         {
 170           // push a new slur onto stack.
 171           // (use temp. array to wait for all slur STOPs)
 172           Grob* slur = new Spanner (get_property ("Slur"));
 173           Slur::set_interface (slur); // cannot remove yet!
 174
 175
 176           if (Direction updown = to_dir (slur_ev->get_mus_property ("direction")))
 177             {
 178               slur->set_grob_property ("direction", gh_int2scm (updown));
 179             }
 180
 181           start_slurs.push (slur);
 182           events_.push (slur_ev);
 183           announce_grob (slur, slur_ev->self_scm ());
 184         }
 185     }
 186   for (int i=0; i < start_slurs.size (); i++)
 187     slur_stack_.push (start_slurs[i]);
 188   new_slur_evs_.clear ();
 189 }
 190
 191 void
 192 Slur_engraver::stop_translation_timestep ()
 193 {
 194   for (int i = 0; i < end_slurs_.size (); i++)
 195     {
 196       typeset_grob (end_slurs_[i]);
 197     }
 198   end_slurs_.clear ();
 199 }
 200
 201 void
 202 Slur_engraver::start_translation_timestep ()
 203 {
 204   new_slur_evs_.clear ();
 205   SCM m = get_property ("automaticMelismata");
 206   if (to_boolean (m))
 207     {
 208       set_melisma (slur_stack_.size ());
 209     }
 210 }
 211
 212
 213
 214 ENTER_DESCRIPTION (Slur_engraver,
 215 /* descr */       "Build slurs from Slur_evs",
 216 /* creats*/       "Slur",
 217 /* accepts */     "slur-event",
 218 /* acks  */      "note-column-interface",
 219 /* reads */       "slurMelismaBusy",
 220 /* write */       "");