lily/context-specced-music-iterator.cc

   1 /*
   2   context-specced-music-iterator.cc -- implement
   3   Context_specced_music_iterator
   4
   5   source file of the GNU LilyPond music typesetter
   6
   7   (c) 2002--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   8 */
   9
  10 #include "music-wrapper-iterator.hh"
  11 #include "context.hh"
  12 #include "music.hh"
  13
  14
  15 class Context_specced_music_iterator : public Music_wrapper_iterator
  16 {
  17 public:
  18   DECLARE_SCHEME_CALLBACK (constructor, ());
  19   virtual void construct_children ();
  20 };
  21
  22 void
  23 Context_specced_music_iterator::construct_children ()
  24 {
  25   SCM ct = get_music ()->get_property ("context-type");
  26
  27   string c_id;
  28   SCM ci = get_music ()->get_property ("context-id");
  29   if (scm_is_string (ci))
  30     c_id = ly_scm2string (ci);
  31   SCM ops = get_music ()->get_property ("property-operations");
  32
  33   Context *a = 0;
  34
  35   if (to_boolean (get_music ()->get_property ("create-new")))
  36     a = get_outlet ()->create_unique_context (ct, c_id, ops);
  37   else
  38     a = get_outlet ()->find_create_context (ct, c_id, ops);
  39
  40   if (a
  41       && to_boolean (get_music ()->get_property ("descend-only"))
  42       && !is_child_context (get_outlet (), a))
  43     a = 0;
  44
  45   if (a)
  46     set_context (a);
  47
  48   Music_wrapper_iterator::construct_children ();
  49 }
  50
  51 IMPLEMENT_CTOR_CALLBACK (Context_specced_music_iterator);