lily/music.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
   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 "music.hh"
  21
  22 #include "context.hh"
  23 #include "dispatcher.hh"
  24 #include "duration.hh"
  25 #include "input.hh"
  26 #include "international.hh"
  27 #include "ly-smobs.icc"
  28 #include "main.hh"
  29 #include "music-sequence.hh"
  30 #include "score.hh"
  31 #include "warn.hh"
  32
  33 /*
  34   Music is anything that has (possibly zero) duration and supports
  35   both time compression and transposition.
  36
  37   In Lily, everything that can be thought to have a length and a pitch
  38   (which has a duration which can be transposed) is considered "music".
  39 */
  40 bool
  41 Music::internal_is_music_type (SCM k) const
  42 {
  43   SCM ifs = get_property ("types");
  44
  45   return scm_c_memq (k, ifs) != SCM_BOOL_F;
  46 }
  47
  48 Music::Music (SCM init)
  49   : Prob (ly_symbol2scm ("Music"), init)
  50 {
  51   length_callback_ = SCM_EOL;
  52   start_callback_ = SCM_EOL;
  53
  54   length_callback_ = get_property ("length-callback");
  55   if (!ly_is_procedure (length_callback_))
  56     length_callback_ = duration_length_callback_proc;
  57
  58   start_callback_ = get_property ("start-callback");
  59 }
  60
  61 void
  62 Music::derived_mark () const
  63 {
  64   scm_gc_mark (length_callback_);
  65   scm_gc_mark (start_callback_);
  66 }
  67
  68 SCM
  69 Music::copy_mutable_properties () const
  70 {
  71   return ly_music_deep_copy (mutable_property_alist_);
  72 }
  73
  74 void
  75 Music::type_check_assignment (SCM s, SCM v) const
  76 {
  77   ::type_check_assignment (s, v, ly_symbol2scm ("music-type?"));
  78 }
  79
  80 Music::Music (Music const &m)
  81   : Prob (m)
  82 {
  83   length_callback_ = m.length_callback_;
  84   start_callback_ = m.start_callback_;
  85
  86   /// why?
  87   set_spot (*m.origin ());
  88 }
  89
  90 Moment
  91 Music::get_length () const
  92 {
  93   SCM lst = get_property ("length");
  94   if (unsmob_moment (lst))
  95     return *unsmob_moment (lst);
  96
  97   if (ly_is_procedure (length_callback_))
  98     {
  99       SCM res = scm_call_1 (length_callback_, self_scm ());
 100       return *unsmob_moment (res);
 101     }
 102
 103   return Moment (0);
 104 }
 105
 106 Moment
 107 Music::start_mom () const
 108 {
 109   SCM lst = start_callback_;
 110   if (ly_is_procedure (lst))
 111     {
 112       SCM res = scm_call_1 (lst, self_scm ());
 113       return *unsmob_moment (res);
 114     }
 115
 116   Moment m;
 117   return m;
 118 }
 119
 120 void
 121 print_alist (SCM a, SCM port)
 122 {
 123   /* SCM_EOL  -> catch malformed lists.  */
 124   for (SCM s = a; scm_is_pair (s); s = scm_cdr (s))
 125     {
 126       scm_display (scm_caar (s), port);
 127       scm_puts (" = ", port);
 128       scm_write (scm_cdar (s), port);
 129       scm_puts ("\n", port);
 130     }
 131 }
 132
 133
 134 Pitch
 135 Music::generic_to_relative_octave (Pitch last)
 136 {
 137   SCM elt = get_property ("element");
 138   Pitch *old_pit = unsmob_pitch (get_property ("pitch"));
 139   if (old_pit)
 140     {
 141       Pitch new_pit = *old_pit;
 142       new_pit = new_pit.to_relative_octave (last);
 143
 144       SCM check = get_property ("absolute-octave");
 145       if (scm_is_number (check)
 146           && new_pit.get_octave () != scm_to_int (check))
 147         {
 148           Pitch expected_pit (scm_to_int (check),
 149                               new_pit.get_notename (),
 150                               new_pit.get_alteration ());
 151           origin ()->warning (_f ("octave check failed; expected \"%s\", found: \"%s\"",
 152                                   expected_pit.to_string (),
 153                                   new_pit.to_string ()));
 154           new_pit = expected_pit;
 155         }
 156
 157       set_property ("pitch", new_pit.smobbed_copy ());
 158
 159       last = new_pit;
 160     }
 161
 162   if (Music *m = unsmob_music (elt))
 163     last = m->to_relative_octave (last);
 164
 165   last = music_list_to_relative (get_property ("elements"), last, false);
 166   return last;
 167 }
 168
 169 Pitch
 170 Music::to_relative_octave (Pitch last)
 171 {
 172   SCM callback = get_property ("to-relative-callback");
 173   if (ly_is_procedure (callback))
 174     {
 175       Pitch *p = unsmob_pitch (scm_call_2 (callback, self_scm (),
 176                                            last.smobbed_copy ()));
 177       return *p;
 178     }
 179
 180   return generic_to_relative_octave (last);
 181 }
 182
 183 void
 184 Music::compress (Moment factor)
 185 {
 186   SCM elt = get_property ("element");
 187
 188   if (Music *m = unsmob_music (elt))
 189     m->compress (factor);
 190
 191   compress_music_list (get_property ("elements"), factor);
 192   Duration *d = unsmob_duration (get_property ("duration"));
 193   if (d)
 194     set_property ("duration",
 195                   d->compressed (factor.main_part_).smobbed_copy ());
 196 }
 197
 198 /*
 199   This mutates alist.  Hence, make sure that it is not shared
 200 */
 201 void
 202 transpose_mutable (SCM alist, Pitch delta)
 203 {
 204   for (SCM s = alist; scm_is_pair (s); s = scm_cdr (s))
 205     {
 206       SCM entry = scm_car (s);
 207       SCM prop = scm_car (entry);
 208       SCM val = scm_cdr (entry);
 209       SCM new_val = val;
 210
 211       if (Pitch *p = unsmob_pitch (val))
 212         {
 213           Pitch transposed = p->transposed (delta);
 214           if (transposed.get_alteration ().abs () > Rational (1,1))
 215             {
 216               string delta_str;
 217               if (delta.get_alteration ().abs () > Rational (1, 1))
 218                 delta_str = (delta.normalized ().to_string ()
 219                              + " " + _ ("(normalized pitch)"));
 220               else
 221                 delta_str = delta.to_string ();
 222
 223               warning (_f ("Transposing %s by %s makes alteration larger than double",
 224                            p->to_string (),
 225                            delta_str));
 226               transposed = transposed.normalized ();
 227             }
 228
 229           new_val = transposed.smobbed_copy ();
 230         }
 231       else if (prop == ly_symbol2scm ("element"))
 232         {
 233           if (Music *m = unsmob_music (val))
 234             m->transpose (delta);
 235         }
 236       else if (prop == ly_symbol2scm ("elements"))
 237         transpose_music_list (val, delta);
 238       else if (prop == ly_symbol2scm ("pitch-alist") &&
 239                scm_is_pair (val))
 240         new_val = ly_transpose_key_alist (val, delta.smobbed_copy ());
 241
 242       if (val != new_val)
 243         scm_set_cdr_x (entry , new_val);
 244     }
 245 }
 246
 247 void
 248 Music::transpose (Pitch delta)
 249 {
 250   if (to_boolean (get_property ("untransposable")))
 251     return;
 252
 253   transpose_mutable (mutable_property_alist_, delta);
 254 }
 255
 256 void
 257 Music::set_spot (Input ip)
 258 {
 259   set_property ("origin", make_input (ip));
 260 }
 261
 262 Input *
 263 Music::origin () const
 264 {
 265   Input *ip = unsmob_input (get_property ("origin"));
 266   return ip ? ip : &dummy_input_global;
 267 }
 268
 269 /*
 270   ES TODO: This method should probably be reworked or junked.
 271 */
 272 Stream_event *
 273 Music::to_event () const
 274 {
 275   SCM class_name = ly_camel_case_2_lisp_identifier (get_property ("name"));
 276
 277   // catch programming mistakes.
 278   if (!internal_is_music_type (class_name))
 279     programming_error ("Not a music type");
 280
 281   Stream_event *e = new Stream_event (class_name, mutable_property_alist_);
 282   Moment length = get_length ();
 283   if (length.to_bool ())
 284     e->set_property ("length", length.smobbed_copy ());
 285
 286   // articulations as events.
 287   SCM art_mus = e->get_property ("articulations");
 288   if (scm_is_pair (art_mus))
 289     {
 290       SCM art_ev = SCM_EOL;
 291       for (; scm_is_pair (art_mus); art_mus = scm_cdr (art_mus))
 292         {
 293           Music *m = unsmob_music (scm_car (art_mus));
 294           SCM ev = m ? m->to_event ()->unprotect () : scm_car (art_mus);
 295           art_ev = scm_cons (ev, art_ev);
 296         }
 297       e->set_property ("articulations", scm_reverse_x (art_ev, SCM_EOL));
 298     }
 299
 300   /*
 301     ES TODO: This is a temporary fix. Stream_events should not be
 302     aware of music.
 303   */
 304   e->set_property ("music-cause", self_scm ());
 305
 306   return e;
 307 }
 308
 309 void
 310 Music::send_to_context (Context *c)
 311 {
 312   Stream_event *ev = to_event ();
 313   c->event_source ()->broadcast (ev);
 314   ev->unprotect ();
 315 }
 316
 317 Music *
 318 make_music_by_name (SCM sym)
 319 {
 320   SCM make_music_proc = ly_lily_module_constant ("make-music");
 321   SCM rv = scm_call_1 (make_music_proc, sym);
 322
 323   /* UGH. */
 324   Music *m = unsmob_music (rv);
 325   m->protect ();
 326   return m;
 327 }
 328
 329 MAKE_SCHEME_CALLBACK (Music, duration_length_callback, 1);
 330 SCM
 331 Music::duration_length_callback (SCM m)
 332 {
 333   Music *me = unsmob_music (m);
 334   Duration *d = unsmob_duration (me->get_property ("duration"));
 335
 336   Moment mom;
 337   if (d)
 338     mom = d->get_length ();
 339   return mom.smobbed_copy ();
 340 }
 341
 342 Music *
 343 unsmob_music (SCM m)
 344 {
 345   return dynamic_cast<Music *> (unsmob_prob (m));
 346 }