lily/simultaneous-music-iterator.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 "simultaneous-music-iterator.hh"
  21 #include "music.hh"
  22 #include "context.hh"
  23 #include "warn.hh"
  24 #include "context-def.hh"
  25
  26 Simultaneous_music_iterator::Simultaneous_music_iterator ()
  27 {
  28   create_separate_contexts_ = false;
  29   children_list_ = SCM_EOL;
  30 }
  31
  32 void
  33 Simultaneous_music_iterator::derived_mark () const
  34 {
  35   scm_gc_mark (children_list_);
  36 }
  37
  38 void
  39 Simultaneous_music_iterator::derived_substitute (Context *f, Context *t)
  40 {
  41   for (SCM s = children_list_; scm_is_pair (s); s = scm_cdr (s))
  42     unsmob_iterator (scm_car (s))->substitute_outlet (f, t);
  43 }
  44
  45 void
  46 Simultaneous_music_iterator::construct_children ()
  47 {
  48   int j = 0;
  49
  50   SCM i = get_music ()->get_property ("elements");
  51
  52   children_list_ = SCM_EOL;
  53   SCM *tail = &children_list_;
  54   for (; scm_is_pair (i); i = scm_cdr (i), j++)
  55     {
  56       Music *mus = unsmob_music (scm_car (i));
  57
  58       SCM scm_iter = get_static_get_iterator (mus);
  59       Music_iterator *mi = unsmob_iterator (scm_iter);
  60
  61       /* if create_separate_contexts_ is set, create a new context with the
  62          number number as name */
  63
  64       SCM name = ly_symbol2scm (get_outlet ()->context_name ().c_str ());
  65       Context *c = (j && create_separate_contexts_)
  66         ? get_outlet ()->find_create_context (name, to_string (j), SCM_EOL)
  67         : get_outlet ();
  68
  69       if (!c)
  70         c = get_outlet ();
  71
  72       mi->init_context (mus, c);
  73       mi->construct_children ();
  74
  75       if (mi->ok ())
  76         {
  77           *tail = scm_cons (scm_iter, *tail);
  78           tail = SCM_CDRLOC (*tail);
  79         }
  80       else
  81         mi->quit ();
  82     }
  83 }
  84
  85 void
  86 Simultaneous_music_iterator::process (Moment until)
  87 {
  88   SCM *proc = &children_list_;
  89   while (scm_is_pair (*proc))
  90     {
  91       Music_iterator *i = unsmob_iterator (scm_car (*proc));
  92       if (i->run_always ()
  93           || i->pending_moment () == until)
  94         i->process (until);
  95       if (!i->ok ())
  96         {
  97           i->quit ();
  98           *proc = scm_cdr (*proc);
  99         }
 100       else
 101         proc = SCM_CDRLOC (*proc);
 102     }
 103 }
 104
 105 Moment
 106 Simultaneous_music_iterator::pending_moment () const
 107 {
 108   Moment next;
 109   next.set_infinite (1);
 110
 111   for (SCM s = children_list_; scm_is_pair (s); s = scm_cdr (s))
 112     {
 113       Music_iterator *it = unsmob_iterator (scm_car (s));
 114       next = min (next, it->pending_moment ());
 115     }
 116
 117   return next;
 118 }
 119
 120 bool
 121 Simultaneous_music_iterator::ok () const
 122 {
 123   bool run_always_ok = false;
 124   for (SCM s = children_list_; scm_is_pair (s); s = scm_cdr (s))
 125     {
 126       Music_iterator *it = unsmob_iterator (scm_car (s));
 127       if (!it->run_always ())
 128         return true;
 129       else
 130         run_always_ok = run_always_ok || it->ok ();
 131     }
 132   return run_always_ok;
 133 }
 134
 135 bool
 136 Simultaneous_music_iterator::run_always () const
 137 {
 138   for (SCM s = children_list_; scm_is_pair (s); s = scm_cdr (s))
 139     {
 140       Music_iterator *it = unsmob_iterator (scm_car (s));
 141       if (it->run_always ())
 142         return true;
 143     }
 144   return false;
 145 }
 146
 147 void
 148 Simultaneous_music_iterator::do_quit ()
 149 {
 150   for (SCM s = children_list_; scm_is_pair (s); s = scm_cdr (s))
 151     unsmob_iterator (scm_car (s))->quit ();
 152 }
 153
 154 IMPLEMENT_CTOR_CALLBACK (Simultaneous_music_iterator);