lily/script-engraver.cc

   1 /*
   2   script-engraver.cc -- engrave Scripts: Articulations.
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "context.hh"
  10 #include "directional-element-interface.hh"
  11 #include "engraver.hh"
  12 #include "slur.hh"
  13 #include "note-column.hh"
  14 #include "paper-column.hh"
  15 #include "rhythmic-head.hh"
  16 #include "script-interface.hh"
  17 #include "side-position-interface.hh"
  18 #include "staff-symbol-referencer.hh"
  19 #include "stem.hh"
  20 #include "warn.hh"
  21
  22 struct Script_tuple
  23 {
  24   Music *event_;
  25   Grob *script_;
  26   bool follow_into_staff_;
  27   Script_tuple ()
  28   {
  29     follow_into_staff_ = false;
  30     event_ = 0;
  31     script_ = 0;
  32   }
  33 };
  34
  35 class Script_engraver : public Engraver
  36 {
  37   Array<Script_tuple> scripts_;
  38   Spanner *slur_;
  39
  40 protected:
  41   virtual bool try_music (Music *);
  42   virtual void stop_translation_timestep ();
  43   virtual void process_music ();
  44   virtual void acknowledge_grob (Grob_info);
  45
  46 public:
  47   TRANSLATOR_DECLARATIONS (Script_engraver);
  48 };
  49
  50 Script_engraver::Script_engraver ()
  51 {
  52   slur_ = 0;
  53 }
  54
  55 bool
  56 Script_engraver::try_music (Music *m)
  57 {
  58   if (m->is_mus_type ("articulation-event"))
  59     {
  60       /* Discard double articulations for part-combining.  */
  61       int script_count = scripts_.size ();
  62       for (int i = 0; i < script_count; i++)
  63         if (ly_c_equal_p (scripts_[i].event_
  64                           ->get_property ("articulation-type"),
  65                           m->get_property ("articulation-type")))
  66           return true;
  67
  68       Script_tuple t;
  69       t.event_ = m;
  70       scripts_.push (t);
  71       return true;
  72     }
  73   return false;
  74 }
  75
  76 void
  77 copy_property (Grob *g, SCM sym, SCM alist)
  78 {
  79   if (g->internal_get_property (sym) == SCM_EOL)
  80     {
  81       SCM entry = scm_assoc (sym, alist);
  82       if (scm_is_pair (entry))
  83         g->internal_set_property (sym, scm_cdr (entry));
  84     }
  85 }
  86
  87 /* Add the properties, one by one for each Script.  A little memory
  88    could be saved by tacking the props onto the Script grob (i.e. make
  89    ScriptStaccato , ScriptMarcato, etc. ).
  90 */
  91 void make_script_from_event (Grob *p, bool *follow, Context *tg,
  92                              SCM art_type, int index)
  93 {
  94   SCM alist = tg->get_property ("scriptDefinitions");
  95   SCM art = scm_assoc (art_type, alist);
  96
  97   if (art == SCM_BOOL_F)
  98     {
  99       /* FIXME: */
 100       warning (_ ("don't know how to interpret articulation: "));
 101       warning (_ ("scheme encoding: "));
 102       scm_write (art_type, scm_current_error_port ());
 103       message ("");
 104       return;
 105     }
 106
 107   art = scm_cdr (art);
 108
 109   SCM follow_scm = scm_assoc (ly_symbol2scm ("follow-into-staff"),
 110                               art);
 111
 112   *follow = scm_is_pair (follow_scm) && to_boolean (scm_cdr (follow_scm));
 113   bool priority_found = false;
 114
 115   for (SCM s = art; scm_is_pair (s); s = scm_cdr (s))
 116     {
 117       SCM sym = scm_caar (s);
 118       SCM type = scm_object_property (sym, ly_symbol2scm ("backend-type?"));
 119       if (!ly_c_procedure_p (type))
 120         continue;
 121
 122       SCM val = scm_cdar (s);
 123
 124       if (sym == ly_symbol2scm ("script-priority"))
 125         {
 126           priority_found = true;
 127           /* Make sure they're in order of user input by adding index i.
 128              Don't use the direction in this priority. Smaller means closer
 129              to the head.  */
 130           int prio = scm_to_int (val) + index;
 131
 132           val = scm_int2num (prio);
 133         }
 134       if (p->internal_get_property (sym) == SCM_EOL)
 135         p->internal_set_property (sym, val);
 136     }
 137
 138   if (!priority_found)
 139     {
 140       p->set_property ("script-priority",
 141                        scm_int2num (index));
 142     }
 143
 144   Side_position_interface::set_axis (p, Y_AXIS);
 145 }
 146
 147 void
 148 Script_engraver::process_music ()
 149 {
 150   int script_count = scripts_.size ();
 151   for (int i = 0; i < script_count; i++)
 152     {
 153       Music *m = scripts_[i].event_;
 154
 155       Grob *p = make_item ("Script", m->self_scm ());
 156
 157       make_script_from_event (p, &scripts_[i].follow_into_staff_, context (),
 158                               m->get_property ("articulation-type"),
 159                               i);
 160
 161       scripts_[i].script_ = p;
 162
 163       SCM force_dir = m->get_property ("direction");
 164       if (is_direction (force_dir) && to_dir (force_dir))
 165         p->set_property ("direction", force_dir);
 166     }
 167 }
 168
 169 void
 170 Script_engraver::acknowledge_grob (Grob_info info)
 171 {
 172   int script_count = scripts_.size ();
 173   if (Stem::has_interface (info.grob ()))
 174     {
 175       for (int i = 0; i < script_count; i++)
 176         {
 177           Grob *e = scripts_[i].script_;
 178
 179           if (to_dir (e->get_property ("side-relative-direction")))
 180             e->set_property ("direction-source", info.grob ()->self_scm ());
 181
 182           /* FIXME: add dependency */
 183           e->add_dependency (info.grob ());
 184           Side_position_interface::add_support (e, info.grob ());
 185         }
 186     }
 187   else if (Rhythmic_head::has_interface (info.grob ())
 188            && info.music_cause ())
 189     {
 190       for (int i = 0; i < script_count; i++)
 191         {
 192           Grob *e = scripts_[i].script_;
 193
 194           if (Side_position_interface::get_axis (e) == X_AXIS
 195               && !e->get_parent (Y_AXIS))
 196             {
 197               e->set_parent (info.grob (), Y_AXIS);
 198               e->add_dependency (info.grob ());
 199             }
 200           Side_position_interface::add_support (e, info.grob ());
 201         }
 202     }
 203   else if (Note_column::has_interface (info.grob ()))
 204     {
 205       /* Make note column the parent of the script.  That is not
 206          correct, but due to seconds in a chord, noteheads may be
 207          swapped around horizontally.
 208
 209          As the note head to put it on is not known now, postpone this
 210          decision to Script_interface::before_line_breaking ().  */
 211       for (int i = 0; i < script_count; i++)
 212         {
 213           Grob *e = scripts_[i].script_;
 214
 215           if (!e->get_parent (X_AXIS)
 216               && Side_position_interface::get_axis (e) == Y_AXIS)
 217             e->set_parent (info.grob (), X_AXIS);
 218         }
 219     }
 220   else if (Slur::has_interface (info.grob ()))
 221     slur_ = dynamic_cast<Spanner *> (info.grob ());
 222 }
 223
 224 void
 225 Script_engraver::stop_translation_timestep ()
 226 {
 227   int script_count = scripts_.size ();
 228   for (int i = 0; i < script_count; i++)
 229     if (scripts_[i].follow_into_staff_)
 230       {
 231         Grob *sc = scripts_[i].script_;
 232         sc->add_offset_callback (Side_position_interface
 233                                  ::quantised_position_proc, Y_AXIS);
 234         sc->set_property ("staff-padding", SCM_EOL);
 235       }
 236
 237   scripts_.clear ();
 238 }
 239
 240 ADD_TRANSLATOR (Script_engraver,
 241                 /* descr */ "Handles note scripted articulations.",
 242                 /* creats*/ "Script",
 243                 /* accepts */ "script-event articulation-event",
 244                 /* acks  */ "stem-interface rhythmic-head-interface "
 245                 "slur-interface note-column-interface",
 246                 /* reads */ "scriptDefinitions",
 247                 /* write */ "");