lily/script-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "engraver.hh"
  21
  22 #include "context.hh"
  23 #include "directional-element-interface.hh"
  24 #include "international.hh"
  25 #include "note-column.hh"
  26 #include "paper-column.hh"
  27 #include "rhythmic-head.hh"
  28 #include "script-interface.hh"
  29 #include "side-position-interface.hh"
  30 #include "slur.hh"
  31 #include "staff-symbol-referencer.hh"
  32 #include "stem.hh"
  33 #include "stream-event.hh"
  34 #include "warn.hh"
  35
  36 #include "translator.icc"
  37
  38 struct Script_tuple
  39 {
  40   Stream_event *event_;
  41   Grob *script_;
  42   Script_tuple ()
  43   {
  44     event_ = 0;
  45     script_ = 0;
  46   }
  47 };
  48
  49 class Script_engraver : public Engraver
  50 {
  51   vector<Script_tuple> scripts_;
  52
  53 protected:
  54   void stop_translation_timestep ();
  55   void process_music ();
  56
  57   DECLARE_TRANSLATOR_LISTENER (articulation);
  58   DECLARE_ACKNOWLEDGER (rhythmic_head);
  59   DECLARE_ACKNOWLEDGER (stem);
  60   DECLARE_ACKNOWLEDGER (stem_tremolo);
  61   DECLARE_ACKNOWLEDGER (note_column);
  62
  63 public:
  64   TRANSLATOR_DECLARATIONS (Script_engraver);
  65 };
  66
  67 Script_engraver::Script_engraver ()
  68 {
  69 }
  70
  71 IMPLEMENT_TRANSLATOR_LISTENER (Script_engraver, articulation);
  72 void
  73 Script_engraver::listen_articulation (Stream_event *ev)
  74 {
  75   /* Discard double articulations for part-combining.  */
  76   int script_count = scripts_.size ();
  77   for (int i = 0; i < script_count; i++)
  78     if (ly_is_equal (scripts_[i].event_
  79                      ->get_property ("articulation-type"),
  80                      ev->get_property ("articulation-type")))
  81       return;
  82
  83   Script_tuple t;
  84   t.event_ = ev;
  85   scripts_.push_back (t);
  86 }
  87
  88 void
  89 copy_property (Grob *g, SCM sym, SCM alist)
  90 {
  91   if (g->internal_get_property (sym) == SCM_EOL)
  92     {
  93       SCM entry = scm_assoc (sym, alist);
  94       if (scm_is_pair (entry))
  95         g->set_property (sym, scm_cdr (entry));
  96     }
  97 }
  98
  99 /* Add the properties, one by one for each Script.  A little memory
 100    could be saved by tacking the props onto the Script grob (i.e. make
 101    ScriptStaccato , ScriptMarcato, etc. ).
 102 */
 103 void
 104 make_script_from_event (Grob *p,  Context *tg,
 105                         SCM art_type, int index)
 106 {
 107   SCM alist = tg->get_property ("scriptDefinitions");
 108   SCM art = scm_assoc (art_type, alist);
 109
 110   if (art == SCM_BOOL_F)
 111     {
 112       /* FIXME: */
 113       warning (_ ("do not know how to interpret articulation: "));
 114       warning (_ ("scheme encoding: "));
 115       scm_write (art_type, scm_current_error_port ());
 116       message ("");
 117       return;
 118     }
 119
 120   art = scm_cdr (art);
 121
 122   bool priority_found = false;
 123
 124   for (SCM s = art; scm_is_pair (s); s = scm_cdr (s))
 125     {
 126       SCM sym = scm_caar (s);
 127       SCM type = scm_object_property (sym, ly_symbol2scm ("backend-type?"));
 128       if (!ly_is_procedure (type))
 129         continue;
 130
 131       SCM val = scm_cdar (s);
 132
 133       if (sym == ly_symbol2scm ("script-priority"))
 134         {
 135           priority_found = true;
 136           /* Make sure they're in order of user input by adding index i.
 137              Don't use the direction in this priority. Smaller means closer
 138              to the head.  */
 139           int prio = scm_to_int (val) + index;
 140
 141           val = scm_from_int (prio);
 142         }
 143
 144       SCM preset = p->get_property_data (sym);
 145       if (val == SCM_EOL
 146           || scm_call_1 (type, preset) == SCM_BOOL_F)
 147         p->set_property (sym, val);
 148     }
 149
 150   if (!priority_found)
 151     {
 152       p->set_property ("script-priority",
 153                        scm_from_int (index));
 154     }
 155 }
 156
 157 void
 158 Script_engraver::process_music ()
 159 {
 160   for (vsize i = 0; i < scripts_.size (); i++)
 161     {
 162       Stream_event *ev = scripts_[i].event_;
 163
 164       Grob *p = make_item ("Script", ev->self_scm ());
 165
 166       make_script_from_event (p, context (),
 167                               ev->get_property ("articulation-type"),
 168                               i);
 169
 170       scripts_[i].script_ = p;
 171
 172       SCM force_dir = ev->get_property ("direction");
 173       if (is_direction (force_dir) && to_dir (force_dir))
 174         p->set_property ("direction", force_dir);
 175     }
 176 }
 177
 178 void
 179 Script_engraver::acknowledge_stem (Grob_info info)
 180 {
 181   int script_count = scripts_.size ();
 182   for (int i = 0; i < script_count; i++)
 183     {
 184       Grob *e = scripts_[i].script_;
 185
 186       if (to_dir (e->get_property ("side-relative-direction")))
 187         e->set_object ("direction-source", info.grob ()->self_scm ());
 188
 189       Side_position_interface::add_support (e, info.grob ());
 190     }
 191 }
 192
 193 void
 194 Script_engraver::acknowledge_stem_tremolo (Grob_info info)
 195 {
 196   int script_count = scripts_.size ();
 197   for (int i = 0; i < script_count; i++)
 198     {
 199       Grob *e = scripts_[i].script_;
 200       Side_position_interface::add_support (e, info.grob ());
 201     }
 202 }
 203
 204
 205 void
 206 Script_engraver::acknowledge_rhythmic_head (Grob_info info)
 207 {
 208   if (info.event_cause ())
 209     {
 210       for (vsize i = 0; i < scripts_.size (); i++)
 211         {
 212           Grob *e = scripts_[i].script_;
 213
 214           if (Side_position_interface::get_axis (e) == X_AXIS
 215               && !e->get_parent (Y_AXIS))
 216             {
 217               e->set_parent (info.grob (), Y_AXIS);
 218             }
 219           Side_position_interface::add_support (e, info.grob ());
 220         }
 221     }
 222 }
 223
 224 void
 225 Script_engraver::acknowledge_note_column (Grob_info info)
 226 {
 227   /* Make note column the parent of the script.  That is not
 228      correct, but due to seconds in a chord, noteheads may be
 229      swapped around horizontally.
 230
 231      As the note head to put it on is not known now, postpone this
 232      decision to Script_interface::calc_direction ().  */
 233   for (vsize i = 0; i < scripts_.size (); i++)
 234     {
 235       Grob *e = scripts_[i].script_;
 236
 237       if (!e->get_parent (X_AXIS)
 238           && Side_position_interface::get_axis (e) == Y_AXIS)
 239         e->set_parent (info.grob (), X_AXIS);
 240     }
 241 }
 242
 243 void
 244 Script_engraver::stop_translation_timestep ()
 245 {
 246   scripts_.clear ();
 247 }
 248
 249 ADD_ACKNOWLEDGER (Script_engraver, rhythmic_head);
 250 ADD_ACKNOWLEDGER (Script_engraver, stem);
 251 ADD_ACKNOWLEDGER (Script_engraver, note_column);
 252 ADD_ACKNOWLEDGER (Script_engraver, stem_tremolo);
 253
 254 ADD_TRANSLATOR (Script_engraver,
 255                 /* doc */
 256                 "Handle note scripted articulations.",
 257
 258                 /* create */
 259                 "Script ",
 260
 261                 /* read */
 262                 "scriptDefinitions ",
 263
 264                 /* write */
 265                 ""
 266                 );