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--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "engraver.hh"
  10
  11 #include "context.hh"
  12 #include "directional-element-interface.hh"
  13 #include "international.hh"
  14 #include "note-column.hh"
  15 #include "paper-column.hh"
  16 #include "rhythmic-head.hh"
  17 #include "script-interface.hh"
  18 #include "side-position-interface.hh"
  19 #include "slur.hh"
  20 #include "staff-symbol-referencer.hh"
  21 #include "stem.hh"
  22 #include "stream-event.hh"
  23 #include "warn.hh"
  24
  25 #include "translator.icc"
  26
  27 struct Script_tuple
  28 {
  29   Stream_event *event_;
  30   Grob *script_;
  31   Script_tuple ()
  32   {
  33     event_ = 0;
  34     script_ = 0;
  35   }
  36 };
  37
  38 class Script_engraver : public Engraver
  39 {
  40   vector<Script_tuple> scripts_;
  41
  42 protected:
  43   void stop_translation_timestep ();
  44   void process_music ();
  45
  46   DECLARE_TRANSLATOR_LISTENER (articulation);
  47   DECLARE_ACKNOWLEDGER (rhythmic_head);
  48   DECLARE_ACKNOWLEDGER (stem);
  49   DECLARE_ACKNOWLEDGER (stem_tremolo);
  50   DECLARE_ACKNOWLEDGER (note_column);
  51
  52 public:
  53   TRANSLATOR_DECLARATIONS (Script_engraver);
  54 };
  55
  56 Script_engraver::Script_engraver ()
  57 {
  58 }
  59
  60 IMPLEMENT_TRANSLATOR_LISTENER (Script_engraver, articulation);
  61 void
  62 Script_engraver::listen_articulation (Stream_event *ev)
  63 {
  64   /* Discard double articulations for part-combining.  */
  65   int script_count = scripts_.size ();
  66   for (int i = 0; i < script_count; i++)
  67     if (ly_is_equal (scripts_[i].event_
  68                      ->get_property ("articulation-type"),
  69                      ev->get_property ("articulation-type")))
  70       return;
  71
  72   Script_tuple t;
  73   t.event_ = ev;
  74   scripts_.push_back (t);
  75 }
  76
  77 void
  78 copy_property (Grob *g, SCM sym, SCM alist)
  79 {
  80   if (g->internal_get_property (sym) == SCM_EOL)
  81     {
  82       SCM entry = scm_assoc (sym, alist);
  83       if (scm_is_pair (entry))
  84         g->set_property (sym, scm_cdr (entry));
  85     }
  86 }
  87
  88 /* Add the properties, one by one for each Script.  A little memory
  89    could be saved by tacking the props onto the Script grob (i.e. make
  90    ScriptStaccato , ScriptMarcato, etc. ).
  91 */
  92 void
  93 make_script_from_event (Grob *p,  Context *tg,
  94                         SCM art_type, int index)
  95 {
  96   SCM alist = tg->get_property ("scriptDefinitions");
  97   SCM art = scm_assoc (art_type, alist);
  98
  99   if (art == SCM_BOOL_F)
 100     {
 101       /* FIXME: */
 102       warning (_ ("do not know how to interpret articulation: "));
 103       warning (_ ("scheme encoding: "));
 104       scm_write (art_type, scm_current_error_port ());
 105       message ("");
 106       return;
 107     }
 108
 109   art = scm_cdr (art);
 110
 111   bool priority_found = false;
 112
 113   for (SCM s = art; scm_is_pair (s); s = scm_cdr (s))
 114     {
 115       SCM sym = scm_caar (s);
 116       SCM type = scm_object_property (sym, ly_symbol2scm ("backend-type?"));
 117       if (!ly_is_procedure (type))
 118         continue;
 119
 120       SCM val = scm_cdar (s);
 121
 122       if (sym == ly_symbol2scm ("script-priority"))
 123         {
 124           priority_found = true;
 125           /* Make sure they're in order of user input by adding index i.
 126              Don't use the direction in this priority. Smaller means closer
 127              to the head.  */
 128           int prio = scm_to_int (val) + index;
 129
 130           val = scm_from_int (prio);
 131         }
 132
 133       SCM preset = p->get_property_data (sym);
 134       if (val == SCM_EOL
 135           || scm_call_1 (type, preset) == SCM_BOOL_F)
 136         p->set_property (sym, val);
 137     }
 138
 139   if (!priority_found)
 140     {
 141       p->set_property ("script-priority",
 142                        scm_from_int (index));
 143     }
 144 }
 145
 146 void
 147 Script_engraver::process_music ()
 148 {
 149   for (vsize i = 0; i < scripts_.size (); i++)
 150     {
 151       Stream_event *ev = scripts_[i].event_;
 152
 153       Grob *p = make_item ("Script", ev->self_scm ());
 154
 155       make_script_from_event (p, context (),
 156                               ev->get_property ("articulation-type"),
 157                               i);
 158
 159       scripts_[i].script_ = p;
 160
 161       SCM force_dir = ev->get_property ("direction");
 162       if (is_direction (force_dir) && to_dir (force_dir))
 163         p->set_property ("direction", force_dir);
 164     }
 165 }
 166
 167 void
 168 Script_engraver::acknowledge_stem (Grob_info info)
 169 {
 170   int script_count = scripts_.size ();
 171   for (int i = 0; i < script_count; i++)
 172     {
 173       Grob *e = scripts_[i].script_;
 174
 175       if (to_dir (e->get_property ("side-relative-direction")))
 176         e->set_object ("direction-source", info.grob ()->self_scm ());
 177
 178       Side_position_interface::add_support (e, info.grob ());
 179     }
 180 }
 181
 182 void
 183 Script_engraver::acknowledge_stem_tremolo (Grob_info info)
 184 {
 185   int script_count = scripts_.size ();
 186   for (int i = 0; i < script_count; i++)
 187     {
 188       Grob *e = scripts_[i].script_;
 189       Side_position_interface::add_support (e, info.grob ());
 190     }
 191 }
 192
 193
 194 void
 195 Script_engraver::acknowledge_rhythmic_head (Grob_info info)
 196 {
 197   if (info.event_cause ())
 198     {
 199       for (vsize i = 0; i < scripts_.size (); i++)
 200         {
 201           Grob *e = scripts_[i].script_;
 202
 203           if (Side_position_interface::get_axis (e) == X_AXIS
 204               && !e->get_parent (Y_AXIS))
 205             {
 206               e->set_parent (info.grob (), Y_AXIS);
 207             }
 208           Side_position_interface::add_support (e, info.grob ());
 209         }
 210     }
 211 }
 212
 213 void
 214 Script_engraver::acknowledge_note_column (Grob_info info)
 215 {
 216   /* Make note column the parent of the script.  That is not
 217      correct, but due to seconds in a chord, noteheads may be
 218      swapped around horizontally.
 219
 220      As the note head to put it on is not known now, postpone this
 221      decision to Script_interface::calc_direction ().  */
 222   for (vsize i = 0; i < scripts_.size (); i++)
 223     {
 224       Grob *e = scripts_[i].script_;
 225
 226       if (!e->get_parent (X_AXIS)
 227           && Side_position_interface::get_axis (e) == Y_AXIS)
 228         e->set_parent (info.grob (), X_AXIS);
 229     }
 230 }
 231
 232 void
 233 Script_engraver::stop_translation_timestep ()
 234 {
 235   scripts_.clear ();
 236 }
 237
 238 ADD_ACKNOWLEDGER (Script_engraver, rhythmic_head);
 239 ADD_ACKNOWLEDGER (Script_engraver, stem);
 240 ADD_ACKNOWLEDGER (Script_engraver, note_column);
 241 ADD_ACKNOWLEDGER (Script_engraver, stem_tremolo);
 242
 243 ADD_TRANSLATOR (Script_engraver,
 244                 /* doc */ "Handles note scripted articulations.",
 245                 /* create */ "Script",
 246                 /* read */ "scriptDefinitions",
 247                 /* write */ "");