2 change-iterator.cc -- implement Change_iterator
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "change-iterator.hh"
17 Change_iterator::error (String reason)
19 String to_type = ly_symbol2string (get_music ()->get_property ("change-to-type"));
20 String to_id = ly_scm2string (get_music ()->get_property ("change-to-id"));
22 String warn1 = _f ("can't change `%s' to `%s'", to_type, to_id)
28 String warn2= "Change_iterator::process (): "
29 + get_outlet ()->context_name () + " = `"
30 + get_outlet ()->id_string () + "': ";
32 get_music ()->origin ()->warning (warn1);
36 move to construct_children ?
39 Change_iterator::process (Moment m)
41 Context * current = get_outlet ();
44 SCM to_type = get_music ()->get_property ("change-to-type");
45 String to_id = ly_scm2string (get_music ()->get_property ("change-to-id"));
48 /* find the type of translator that we're changing.
50 If \translator Staff = bass, then look for Staff = *
52 while (current && !current->is_alias (to_type))
55 current = current->get_parent_context ();
58 if (current && current->id_string () == to_id)
61 msg += _ ("Can't switch translators, I'm there already");
68 Context * where = get_outlet ();
69 while (!dest && where)
71 dest = find_context_below (where, to_type, to_id);
72 where = where->get_parent_context ();
77 current->remove_context (last);
78 dest->add_context (last);
82 get_music ()->origin ()->warning ("could not find context to switch to.");
88 We could change the current translator's id, but that would make
91 last->translator_id_string () = get_change ()->change_to_id_string ();
93 error (_ ("I'm one myself"));
96 error (_ ("none of these in my family"));
98 Simple_music_iterator::process (m);
103 IMPLEMENT_CTOR_CALLBACK (Change_iterator);