lily/quote-iterator.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2004--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-wrapper-iterator.hh"
  21
  22 #include "context.hh"
  23 #include "dispatcher.hh"
  24 #include "input.hh"
  25 #include "international.hh"
  26 #include "lily-guile.hh"
  27 #include "music-sequence.hh"
  28 #include "music.hh"
  29 #include "warn.hh"
  30
  31 class Quote_iterator : public Music_wrapper_iterator
  32 {
  33 public:
  34   Quote_iterator ();
  35   Moment vector_moment (int idx) const;
  36   Context_handle quote_outlet_;
  37
  38   Moment start_moment_;
  39   Moment stop_moment_;
  40   SCM event_vector_;
  41   int event_idx_;
  42   int end_idx_;
  43
  44   SCM transposed_musics_;
  45
  46   DECLARE_SCHEME_CALLBACK (constructor, ());
  47   bool quote_ok () const;
  48   bool accept_music_type (Stream_event *, bool is_cue = true) const;
  49
  50 protected:
  51   virtual void derived_mark () const;
  52   virtual void construct_children ();
  53   virtual Moment pending_moment () const;
  54   virtual void process (Moment);
  55   virtual void do_quit ();
  56   virtual bool ok () const;
  57 };
  58
  59 void
  60 Quote_iterator::do_quit ()
  61 {
  62   Music_wrapper_iterator::do_quit ();
  63   quote_outlet_.set_context (0);
  64 }
  65
  66 bool
  67 Quote_iterator::accept_music_type (Stream_event *ev, bool is_cue) const
  68 {
  69   SCM accept = SCM_EOL;
  70   // Cue notes use the quotedCueEventTypes property, otherwise (and as fallback
  71   // for cue notes if quotedCueEventTypes is not set) use quotedEventTypes
  72   if (is_cue)
  73     accept = get_outlet ()->get_property ("quotedCueEventTypes");
  74   if (accept == SCM_EOL)
  75     accept = get_outlet ()->get_property ("quotedEventTypes");
  76
  77   for (; scm_is_pair (accept); accept = scm_cdr (accept))
  78     {
  79       if (ev->internal_in_event_class (scm_car (accept)))
  80         return true;
  81     }
  82   return false;
  83 }
  84
  85 void
  86 Quote_iterator::derived_mark () const
  87 {
  88   Music_wrapper_iterator::derived_mark ();
  89   scm_gc_mark (transposed_musics_);
  90 }
  91
  92 Quote_iterator::Quote_iterator ()
  93 {
  94   transposed_musics_ = SCM_EOL;
  95   event_vector_ = SCM_EOL;
  96   event_idx_ = 0;
  97   end_idx_ = 0;
  98 }
  99
 100 int
 101 binsearch_scm_vector (SCM vec, SCM key, bool (*is_less) (SCM a, SCM b))
 102 {
 103   int lo = 0;
 104   int hi = scm_c_vector_length (vec);
 105
 106   /* binary search */
 107   do
 108     {
 109       int cmp = (lo + hi) / 2;
 110
 111       SCM when = scm_caar (scm_c_vector_ref (vec, cmp));
 112       bool result = (*is_less) (key, when);
 113       if (result)
 114         hi = cmp;
 115       else
 116         lo = cmp;
 117     }
 118   while (hi - lo > 1);
 119
 120   return lo;
 121 }
 122
 123 void
 124 Quote_iterator::construct_children ()
 125 {
 126   Music_wrapper_iterator::construct_children ();
 127
 128   SCM name = get_music ()->get_property ("quoted-context-type");
 129   SCM id = get_music ()->get_property ("quoted-context-id");
 130
 131   if (scm_is_string (id)
 132       && scm_is_symbol (name))
 133     {
 134       Context *cue_context = get_outlet ()->find_create_context (name,
 135                                                                  ly_scm2string (id), SCM_EOL);
 136       quote_outlet_.set_context (cue_context);
 137     }
 138   else
 139     quote_outlet_.set_context (get_outlet ());
 140
 141   event_vector_ = get_music ()->get_property ("quoted-events");
 142
 143   /*
 144     We have to delay initting event_idx_ , since we have to
 145     take starting grace notes into account. Those may offset
 146     event_idx_.
 147   */
 148   event_idx_ = -1;
 149 }
 150
 151 bool
 152 Quote_iterator::ok () const
 153 {
 154   return
 155     Music_wrapper_iterator::ok ()
 156     || quote_ok ();
 157 }
 158
 159 bool
 160 Quote_iterator::quote_ok () const
 161 {
 162   return (event_idx_ >= 0
 163           && scm_is_vector (event_vector_)
 164           && event_idx_ <= end_idx_
 165
 166           /*
 167             Don't quote the grace notes leading to an unquoted note.
 168           */
 169           && vector_moment (event_idx_).main_part_ < stop_moment_.main_part_);
 170 }
 171
 172 Moment
 173 Quote_iterator::pending_moment () const
 174 {
 175   Rational infty;
 176   infty.set_infinite (1);
 177   Moment m (infty);
 178
 179   if (Music_wrapper_iterator::ok ())
 180     m = min (m, Music_wrapper_iterator::pending_moment ());
 181
 182   /*
 183     In case event_idx_ < 0, we're not initted yet, and the wrapped
 184     music expression determines the starting moment.
 185   */
 186   if (quote_ok ())
 187     m = min (m, vector_moment (event_idx_) - start_moment_);
 188
 189   return m;
 190 }
 191
 192 Moment
 193 Quote_iterator::vector_moment (int idx) const
 194 {
 195   SCM entry = scm_c_vector_ref (event_vector_, idx);
 196   return *unsmob_moment (scm_caar (entry));
 197 }
 198
 199 void
 200 Quote_iterator::process (Moment m)
 201 {
 202   if (Music_wrapper_iterator::ok ())
 203     Music_wrapper_iterator::process (m);
 204
 205   if (!scm_is_vector (event_vector_))
 206     return;
 207
 208   if (event_idx_ < 0)
 209     {
 210       event_idx_ = binsearch_scm_vector (event_vector_,
 211                                          get_outlet ()->now_mom ().smobbed_copy (),
 212                                          &moment_less);
 213       start_moment_ = get_outlet ()->now_mom () - music_start_mom ();
 214       stop_moment_ = start_moment_ + get_music ()->get_length ();
 215
 216       end_idx_ = binsearch_scm_vector (event_vector_,
 217                                        stop_moment_.smobbed_copy (),
 218                                        &moment_less);
 219     }
 220
 221   m += start_moment_;
 222   while (event_idx_ <= end_idx_)
 223     {
 224       Moment em = vector_moment (event_idx_);
 225       if (em > m)
 226         return;
 227
 228       if (em == m)
 229         break;
 230
 231       event_idx_++;
 232     }
 233
 234   if (quote_ok ())
 235     {
 236       SCM entry = scm_c_vector_ref (event_vector_, event_idx_);
 237       Pitch *quote_pitch = unsmob_pitch (scm_cdar (entry));
 238
 239       /*
 240         The pitch that sounds like central C
 241       */
 242       Pitch *me_pitch = unsmob_pitch (get_music ()->get_property ("quoted-transposition"));
 243       if (!me_pitch)
 244         me_pitch = unsmob_pitch (get_outlet ()->get_property ("instrumentTransposition"));
 245       SCM cid = get_music ()->get_property ("quoted-context-id");
 246       bool is_cue = scm_is_string (cid) && (ly_scm2string (cid) == "cue");
 247
 248       for (SCM s = scm_cdr (entry); scm_is_pair (s); s = scm_cdr (s))
 249         {
 250           SCM ev_acc = scm_car (s);
 251
 252           Stream_event *ev = unsmob_stream_event (scm_car (ev_acc));
 253           if (!ev)
 254             programming_error ("no music found in quote");
 255           else if (accept_music_type (ev, is_cue))
 256             {
 257               /* create a transposed copy if necessary */
 258               if (quote_pitch || me_pitch)
 259                 {
 260                   Pitch qp, mp;
 261                   if (quote_pitch)
 262                     qp = *quote_pitch;
 263                   if (me_pitch)
 264                     mp = *me_pitch;
 265
 266                   Pitch diff = pitch_interval (qp, mp);
 267                   ev = ev->clone ();
 268
 269                   transpose_mutable (ev->get_property_alist (true), diff);
 270                   transposed_musics_ = scm_cons (ev->unprotect (), transposed_musics_);
 271                 }
 272               quote_outlet_.get_outlet ()->event_source ()->broadcast (ev);
 273             }
 274         }
 275
 276       event_idx_++;
 277     }
 278 }
 279
 280 IMPLEMENT_CTOR_CALLBACK (Quote_iterator);