/*
- change-iterator.cc -- implement Change_iterator
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "change-iterator.hh"
+
#include "context.hh"
+#include "input.hh"
+#include "international.hh"
#include "music.hh"
#include "warn.hh"
-#include "input.hh"
-
void
-Change_iterator::error (String reason)
+Change_iterator::error (const string &reason)
{
- String to_type = ly_symbol2string (get_music ()->get_property ("change-to-type"));
- String to_id = ly_scm2string (get_music ()->get_property ("change-to-id"));
+ string to_type = ly_symbol2string (get_music ()->get_property ("change-to-type"));
+ string to_id = ly_scm2string (get_music ()->get_property ("change-to-id"));
- String warn1 = _f ("can't change `%s' to `%s'", to_type, to_id)
- + ": " + reason;
+ string warn1 = _f ("cannot change `%s' to `%s'", to_type, to_id)
+ + ": " + reason;
/*
GUHG!
- */
- String warn2= "Change_iterator::process (): "
- + get_outlet ()->context_name () + " = `"
- + get_outlet ()->id_string_ + "': ";
+ */
+ string warn2 = "Change_iterator::process (): "
+ + get_outlet ()->context_name () + " = `"
+ + get_outlet ()->id_string () + "': ";
warning (warn2);
get_music ()->origin ()->warning (warn1);
}
-/*
- move to construct_children ?
- */
-void
-Change_iterator::process (Moment m)
+string
+Change_iterator::change_to (Music_iterator &it,
+ SCM to_type,
+ const string &to_id)
{
- Context * current = get_outlet ();
- Context * last = 0;
-
- SCM to_type = get_music ()->get_property ("change-to-type");
- String to_id = ly_scm2string (get_music ()->get_property ("change-to-id"));
-
+ string result; // error message
- /* find the type of translator that we're changing.
-
- If \translator Staff = bass, then look for Staff = *
- */
- while (current && !current->is_alias (to_type))
+ // Find the context that should have its parent changed.
+ Context *last = find_context_above_by_parent_type (it.get_outlet (), to_type);
+ if (last)
{
- last = current;
- current = current->daddy_context_;
+ // Find the new parent.
+ Context *dest = find_context_near (it.get_outlet (), to_type, to_id);
+ if (dest)
+ {
+ send_stream_event (last, "ChangeParent", it.get_music ()->origin (),
+ ly_symbol2scm ("context"), dest->self_scm ());
+ }
+ else
+ /* FIXME: constant error message. */
+ it.get_music ()->origin ()->warning (_ ("cannot find context to switch to"));
}
-
- if (current && current->id_string_ == to_id)
+ else if (it.get_outlet ()->is_alias (to_type))
{
- String msg;
- msg += _ ("Can't switch translators, I'm there already");
+ // No enclosing context was found because the iterator's immediate
+ // context is the kind that was sought.
+ /* We could change the current translator's id, but that would make
+ errors hard to catch.
+
+ last->translator_id_string () = get_change
+ ()->change_to_id_string (); */
+ result = _f ("not changing to same context type: %s", ly_symbol2string (to_type).c_str ());
}
-
- if (current)
- if (last)
- {
- Context * dest =
- get_outlet ()->find_create_context (to_type, to_id, SCM_EOL);
- current->remove_context (last);
- dest->add_context (last);
- }
- else
- {
- /*
- We could change the current translator's id, but that would make
- errors hard to catch
-
- last->translator_id_string_ = get_change ()->change_to_id_string_;
- */
- error (_ ("I'm one myself"));
- }
else
- error (_ ("none of these in my family"));
+ /* FIXME: incomprehensible message */
+ result = _ ("none of these in my family");
- Simple_music_iterator::process (m);
+ return result;
}
+/*
+ move to construct_children ?
+*/
+void
+Change_iterator::process (Moment m)
+{
+ SCM to_type = get_music ()->get_property ("change-to-type");
+ string to_id = ly_scm2string (get_music ()->get_property ("change-to-id"));
+
+ string msg = change_to (*this, to_type, to_id);
+ if (!msg.empty ())
+ error (msg);
+ Simple_music_iterator::process (m);
+}
IMPLEMENT_CTOR_CALLBACK (Change_iterator);