lily/accidental-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5   Modified 2001--2002 by Rune Zedeler <rz@daimi.au.dk>
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "accidental-placement.hh"
  22 #include "arpeggio.hh"
  23 #include "context.hh"
  24 #include "duration.hh"
  25 #include "engraver.hh"
  26 #include "international.hh"
  27 #include "item.hh"
  28 #include "pitch.hh"
  29 #include "protected-scm.hh"
  30 #include "rhythmic-head.hh"
  31 #include "separation-item.hh"
  32 #include "side-position-interface.hh"
  33 #include "spanner.hh"
  34 #include "stream-event.hh"
  35 #include "tie.hh"
  36 #include "warn.hh"
  37
  38 #include "translator.icc"
  39
  40 class Accidental_entry
  41 {
  42 public:
  43   bool done_;
  44   Stream_event *melodic_;
  45   Grob *accidental_;
  46   Context *origin_;
  47   Engraver *origin_engraver_;
  48   Grob *head_;
  49   bool tied_;
  50
  51   Accidental_entry ();
  52 };
  53
  54 Accidental_entry::Accidental_entry ()
  55 {
  56   tied_ = false;
  57   done_ = false;
  58   melodic_ = 0;
  59   accidental_ = 0;
  60   origin_ = 0;
  61   head_ = 0;
  62 }
  63
  64 class Accidental_engraver : public Engraver
  65 {
  66   void update_local_key_signature (SCM new_signature);
  67   void create_accidental (Accidental_entry *entry, bool, bool);
  68   Grob *make_standard_accidental (Stream_event *note, Grob *note_head, Engraver *trans, bool);
  69   Grob *make_suggested_accidental (Stream_event *note, Grob *note_head, Engraver *trans);
  70
  71 protected:
  72   TRANSLATOR_DECLARATIONS (Accidental_engraver);
  73   void process_music ();
  74
  75   void acknowledge_tie (Grob_info);
  76   void acknowledge_arpeggio (Grob_info);
  77   void acknowledge_rhythmic_head (Grob_info);
  78   void acknowledge_finger (Grob_info);
  79   void acknowledge_note_column (Grob_info);
  80
  81   void stop_translation_timestep ();
  82   void process_acknowledged ();
  83
  84   virtual void finalize ();
  85   virtual void derived_mark () const;
  86
  87 public:
  88   SCM last_keysig_;
  89
  90   vector<Grob*> left_objects_;
  91   vector<Grob*> right_objects_;
  92
  93   Grob *accidental_placement_;
  94
  95   vector<Accidental_entry> accidentals_;
  96   vector<Spanner*> ties_;
  97   vector<Grob*> note_columns_;
  98 };
  99
 100 /*
 101   localKeySignature is changed at runtime, which means that references
 102   in grobs should always store ly_deep_copy ()s of those.
 103 */
 104
 105
 106 Accidental_engraver::Accidental_engraver ()
 107 {
 108   accidental_placement_ = 0;
 109   last_keysig_ = SCM_EOL;
 110 }
 111
 112 void
 113 Accidental_engraver::derived_mark () const
 114 {
 115   scm_gc_mark (last_keysig_);
 116 }
 117
 118 void
 119 Accidental_engraver::update_local_key_signature (SCM new_sig)
 120 {
 121   last_keysig_ = new_sig;
 122   set_context_property_on_children (context (),
 123                                     ly_symbol2scm ("localKeySignature"),
 124                                     new_sig);
 125
 126   Context *trans = context ()->get_parent_context ();
 127
 128   /*
 129     Reset parent contexts so that e.g. piano-accidentals won't remember old
 130     cross-staff accidentals after key-sig-changes.
 131   */
 132
 133   SCM val;
 134   while (trans && trans->where_defined (ly_symbol2scm ("localKeySignature"), &val) == trans)
 135     {
 136       trans->set_property ("localKeySignature", ly_deep_copy (last_keysig_));
 137       trans = trans->get_parent_context ();
 138     }
 139 }
 140
 141 struct Accidental_result
 142 {
 143   bool need_acc;
 144   bool need_restore;
 145
 146   Accidental_result ()
 147   {
 148     need_restore = need_acc = false;
 149   }
 150
 151   Accidental_result (bool restore, bool acc)
 152   {
 153     need_restore = restore;
 154     need_acc = acc;
 155   }
 156
 157   Accidental_result (SCM scm)
 158   {
 159     need_restore = to_boolean (scm_car (scm));
 160     need_acc = to_boolean (scm_cdr (scm));
 161   }
 162
 163   int score () const
 164   {
 165     return need_acc ? 1 : 0
 166       + need_restore ? 1 : 0;
 167   }
 168 };
 169
 170 static
 171 Accidental_result
 172 check_pitch_against_rules (Pitch const &pitch, Context *origin,
 173                            SCM rules, int bar_number, SCM measurepos)
 174 {
 175   Accidental_result result;
 176   SCM pitch_scm = pitch.smobbed_copy ();
 177   SCM barnum_scm = scm_from_int (bar_number);
 178
 179   if (scm_is_pair (rules) && !scm_is_symbol (scm_car (rules)))
 180     warning (_f ("accidental typesetting list must begin with context-name: %s",
 181                  ly_scm2string (scm_car (rules)).c_str ()));
 182
 183   for (; scm_is_pair (rules) && origin; rules = scm_cdr (rules))
 184     {
 185       SCM rule = scm_car (rules);
 186       if (ly_is_procedure (rule))
 187         {
 188           SCM rule_result_scm = scm_call_4 (rule, origin->self_scm (),
 189                                             pitch_scm, barnum_scm, measurepos);
 190           Accidental_result rule_result (rule_result_scm);
 191
 192           result.need_acc |= rule_result.need_acc;
 193           result.need_restore |= rule_result.need_restore;
 194         }
 195
 196       /*
 197         If symbol then it is a context name.  Scan parent contexts to
 198         find it.
 199       */
 200       else if (scm_is_symbol (rule))
 201         {
 202           Context *dad = origin;
 203           while (dad && !dad->is_alias (rule))
 204             dad = dad->get_parent_context ();
 205
 206           if (dad)
 207             origin = dad;
 208         }
 209       else
 210         warning (_f ("procedure or context-name expected for accidental rule, found %s",
 211                      print_scm_val (rule).c_str ()));
 212     }
 213
 214   return result;
 215 }
 216
 217 void
 218 Accidental_engraver::process_acknowledged ()
 219 {
 220   if (accidentals_.size () && !accidentals_.back ().done_)
 221     {
 222       SCM accidental_rules = get_property ("autoAccidentals");
 223       SCM cautionary_rules = get_property ("autoCautionaries");
 224       SCM measure_position = get_property ("measurePosition");
 225       int barnum = measure_number (context());
 226
 227       for (vsize i = 0; i < accidentals_.size (); i++)
 228         {
 229           if (accidentals_[i].done_)
 230             continue;
 231           accidentals_[i].done_ = true;
 232
 233           Stream_event *note = accidentals_[i].melodic_;
 234           Context *origin = accidentals_[i].origin_;
 235
 236           Pitch *pitch = unsmob_pitch (note->get_property ("pitch"));
 237           if (!pitch)
 238             continue;
 239
 240           Accidental_result acc = check_pitch_against_rules (*pitch, origin, accidental_rules,
 241                                                              barnum, measure_position);
 242           Accidental_result caut = check_pitch_against_rules (*pitch, origin, cautionary_rules,
 243                                                               barnum, measure_position);
 244
 245           bool cautionary = to_boolean (note->get_property ("cautionary"));
 246           if (caut.score () > acc.score ())
 247             {
 248               acc.need_acc |= caut.need_acc;
 249               acc.need_restore |= caut.need_restore;
 250
 251               cautionary = true;
 252             }
 253
 254           bool forced = to_boolean (note->get_property ("force-accidental"));
 255           if (!acc.need_acc && forced)
 256             acc.need_acc = true;
 257
 258           /*
 259             Cannot look for ties: it's not guaranteed that they reach
 260             us before the notes.
 261           */
 262           if (!note->in_event_class ("trill-span-event"))
 263             {
 264               if (acc.need_acc)
 265                 create_accidental (&accidentals_[i], acc.need_restore, cautionary);
 266
 267               if (forced || cautionary)
 268                 accidentals_[i].accidental_->set_property ("forced", SCM_BOOL_T);
 269             }
 270         }
 271     }
 272 }
 273
 274 void
 275 Accidental_engraver::create_accidental (Accidental_entry *entry,
 276                                         bool restore_natural,
 277                                         bool cautionary)
 278 {
 279   Stream_event *note = entry->melodic_;
 280   Grob *support = entry->head_;
 281   bool as_suggestion = to_boolean (entry->origin_->get_property ("suggestAccidentals"));
 282   Grob *a = 0;
 283   if (as_suggestion)
 284     a = make_suggested_accidental (note, support, entry->origin_engraver_);
 285   else
 286     a = make_standard_accidental (note, support, entry->origin_engraver_, cautionary);
 287
 288   if (restore_natural)
 289     {
 290       if (to_boolean (get_property ("extraNatural")))
 291         a->set_property ("restore-first", SCM_BOOL_T);
 292     }
 293
 294   entry->accidental_ = a;
 295 }
 296
 297 Grob *
 298 Accidental_engraver::make_standard_accidental (Stream_event * /* note */,
 299                                                Grob *note_head,
 300                                                Engraver *trans,
 301                                                bool cautionary)
 302 {
 303   /*
 304     We construct the accidentals at the originating Voice
 305     level, so that we get the property settings for
 306     Accidental from the respective Voice.
 307   */
 308   Grob *a = 0;
 309   if (cautionary)
 310     a = trans->make_item ("AccidentalCautionary", note_head->self_scm ());
 311   else
 312     a = trans->make_item ("Accidental", note_head->self_scm ());
 313
 314   /*
 315     We add the accidentals to the support of the arpeggio,
 316     so it is put left of the accidentals.
 317   */
 318   for (vsize i = 0; i < left_objects_.size (); i++)
 319     {
 320       if (left_objects_[i]->get_property ("side-axis") == scm_from_int (X_AXIS))
 321         Side_position_interface::add_support (left_objects_[i], a);
 322     }
 323
 324   for (vsize i = 0; i < right_objects_.size (); i++)
 325     Side_position_interface::add_support (a, right_objects_[i]);
 326
 327   a->set_parent (note_head, Y_AXIS);
 328
 329   if (!accidental_placement_)
 330     accidental_placement_ = make_item ("AccidentalPlacement",
 331                                        a->self_scm ());
 332   Accidental_placement::add_accidental (accidental_placement_, a);
 333
 334   note_head->set_object ("accidental-grob", a->self_scm ());
 335
 336   return a;
 337 }
 338
 339 Grob *
 340 Accidental_engraver::make_suggested_accidental (Stream_event * /* note */,
 341                                                 Grob *note_head,
 342                                                 Engraver *trans)
 343 {
 344   Grob *a = trans->make_item ("AccidentalSuggestion", note_head->self_scm ());
 345
 346   Side_position_interface::add_support (a, note_head);
 347   if (Grob *stem = unsmob_grob (a->get_object ("stem")))
 348     Side_position_interface::add_support (a, stem);
 349
 350   a->set_parent (note_head, X_AXIS);
 351   return a;
 352 }
 353
 354 void
 355 Accidental_engraver::finalize ()
 356 {
 357   last_keysig_ = SCM_EOL;
 358 }
 359
 360 void
 361 Accidental_engraver::stop_translation_timestep ()
 362 {
 363   for (vsize j = ties_.size (); j--;)
 364     {
 365       Grob *r = Tie::head (ties_[j], RIGHT);
 366       for (vsize i = accidentals_.size (); i--;)
 367         if (accidentals_[i].head_ == r)
 368           {
 369             if (Grob *g = accidentals_[i].accidental_)
 370               {
 371                 g->set_object ("tie", ties_[j]->self_scm ());
 372                 accidentals_[i].tied_ = true;
 373               }
 374             ties_.erase (ties_.begin () + j);
 375             break;
 376           }
 377     }
 378
 379   for (vsize i = accidentals_.size (); i--;)
 380     {
 381       Stream_event *note = accidentals_[i].melodic_;
 382       Context *origin = accidentals_[i].origin_;
 383
 384       int barnum = measure_number (origin);
 385
 386       Pitch *pitch = unsmob_pitch (note->get_property ("pitch"));
 387       if (!pitch)
 388         continue;
 389
 390       int n = pitch->get_notename ();
 391       int o = pitch->get_octave ();
 392       Rational a = pitch->get_alteration ();
 393       SCM key = scm_cons (scm_from_int (o), scm_from_int (n));
 394
 395       Moment end_mp = measure_position (context (),
 396                                         unsmob_duration (note->get_property ("duration")));
 397       SCM position = scm_cons (scm_from_int (barnum), end_mp.smobbed_copy ());
 398
 399       SCM localsig = SCM_EOL;
 400       while (origin
 401              && origin->where_defined (ly_symbol2scm ("localKeySignature"), &localsig))
 402         {
 403           bool change = false;
 404           if (accidentals_[i].tied_
 405               && !(to_boolean (accidentals_[i].accidental_->get_property ("forced"))))
 406             {
 407               /*
 408                 Remember an alteration that is different both from
 409                 that of the tied note and of the key signature.
 410               */
 411               localsig = ly_assoc_prepend_x (localsig, key,scm_cons (ly_symbol2scm ("tied"),
 412                                                                      position));
 413               change = true;
 414             }
 415           else
 416             {
 417               /*
 418                 not really correct if there is more than one
 419                 note head with the same notename.
 420               */
 421               localsig = ly_assoc_prepend_x (localsig, key,
 422                                              scm_cons (ly_rational2scm (a),
 423                                                        position));
 424               change = true;
 425             }
 426
 427           if (change)
 428             origin->set_property ("localKeySignature", localsig);
 429
 430           origin = origin->get_parent_context ();
 431         }
 432     }
 433
 434   if (accidental_placement_)
 435     for (vsize i = 0; i < note_columns_.size (); i++)
 436       Separation_item::add_conditional_item (note_columns_[i], accidental_placement_);
 437
 438   accidental_placement_ = 0;
 439   accidentals_.clear ();
 440   note_columns_.clear ();
 441   left_objects_.clear ();
 442   right_objects_.clear ();
 443 }
 444
 445 void
 446 Accidental_engraver::acknowledge_rhythmic_head (Grob_info info)
 447 {
 448   Stream_event *note = info.event_cause ();
 449   if (note
 450       && (note->in_event_class ("note-event")
 451           || note->in_event_class ("trill-span-event")))
 452     {
 453       /*
 454         string harmonics usually don't have accidentals.
 455       */
 456       if (info.grob ()->get_property ("style") != ly_symbol2scm ("harmonic")
 457           || to_boolean (get_property ("harmonicAccidentals")))
 458         {
 459           Accidental_entry entry;
 460           entry.head_ = info.grob ();
 461           entry.origin_engraver_ = dynamic_cast<Engraver *> (info.origin_translator ());
 462           entry.origin_ = entry.origin_engraver_->context ();
 463           entry.melodic_ = note;
 464
 465           accidentals_.push_back (entry);
 466         }
 467     }
 468 }
 469
 470 void
 471 Accidental_engraver::acknowledge_tie (Grob_info info)
 472 {
 473   ties_.push_back (dynamic_cast<Spanner *> (info.grob ()));
 474 }
 475
 476 void
 477 Accidental_engraver::acknowledge_note_column (Grob_info info)
 478 {
 479   note_columns_.push_back (info.grob ());
 480 }
 481
 482 void
 483 Accidental_engraver::acknowledge_arpeggio (Grob_info info)
 484 {
 485   left_objects_.push_back (info.grob ());
 486 }
 487
 488 void
 489 Accidental_engraver::acknowledge_finger (Grob_info info)
 490 {
 491   left_objects_.push_back (info.grob ());
 492 }
 493
 494 void
 495 Accidental_engraver::process_music ()
 496 {
 497   SCM sig = get_property ("keySignature");
 498   if (last_keysig_ != sig)
 499     update_local_key_signature (sig);
 500 }
 501
 502 ADD_ACKNOWLEDGER (Accidental_engraver, arpeggio);
 503 ADD_ACKNOWLEDGER (Accidental_engraver, finger);
 504 ADD_ACKNOWLEDGER (Accidental_engraver, rhythmic_head);
 505 ADD_ACKNOWLEDGER (Accidental_engraver, tie);
 506 ADD_ACKNOWLEDGER (Accidental_engraver, note_column);
 507
 508 ADD_TRANSLATOR (Accidental_engraver,
 509                 /* doc */
 510                 "Make accidentals."
 511                 "  Catch note heads, ties and notices key-change events."
 512                 "  This engraver usually lives at Staff level, but"
 513                 " reads the settings for Accidental at @code{Voice} level,"
 514                 " so you can @code{\\override} them at @code{Voice}.",
 515
 516                 /* create */
 517                 "Accidental "
 518                 "AccidentalCautionary "
 519                 "AccidentalPlacement "
 520                 "AccidentalSuggestion ",
 521
 522                 /* read */
 523                 "autoAccidentals "
 524                 "autoCautionaries "
 525                 "internalBarNumber "
 526                 "extraNatural "
 527                 "harmonicAccidentals "
 528                 "keySignature "
 529                 "localKeySignature ",
 530
 531                 /* write */
 532                 "localKeySignature "
 533                 );