lily/unfolded-repeat-iterator.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--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 #include "sequential-iterator.hh"
  22 #include "context.hh"
  23
  24 class Unfolded_repeat_iterator : public Sequential_iterator
  25 {
  26 public:
  27   DECLARE_SCHEME_CALLBACK (constructor, ());
  28 protected:
  29   virtual SCM get_music_list () const;
  30 };
  31
  32 SCM
  33 Unfolded_repeat_iterator::get_music_list () const
  34 {
  35   SCM l = SCM_EOL;
  36   SCM *tail = &l;
  37
  38   SCM body = get_music ()->get_property ("element");
  39   SCM alts = get_music ()->get_property ("elements");
  40   int alt_count = scm_ilength (alts);
  41   int rep_count = scm_to_int (get_music ()->get_property ("repeat-count"));
  42
  43   for (int i = 0; i < rep_count; i++)
  44     {
  45       if (unsmob_music (body))
  46         *tail = scm_cons (body, SCM_EOL);
  47
  48       tail = SCM_CDRLOC (*tail);
  49
  50       if (alt_count)
  51         {
  52           *tail = scm_cons (scm_car (alts), SCM_EOL);
  53           tail = SCM_CDRLOC (*tail);
  54           if (i >= rep_count - alt_count)
  55
  56             alts = scm_cdr (alts);
  57         }
  58     }
  59
  60   return l;
  61 }
  62
  63 IMPLEMENT_CTOR_CALLBACK (Unfolded_repeat_iterator);