/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 1999--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 1999--2015 Han-Wen Nienhuys <hanwen@xs4all.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
along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
-#include "context.hh"
-#include "direction.hh"
-#include "international.hh"
-#include "music.hh"
-#include "music-wrapper-iterator.hh"
+#include "change-iterator.hh"
+#include "change-sequence-iterator.hh"
-class Auto_change_iterator : public Music_wrapper_iterator
+class Auto_change_iterator : public Change_sequence_iterator
{
public:
DECLARE_SCHEME_CALLBACK (constructor, ());
+ Auto_change_iterator () {}
- Auto_change_iterator ();
-
-protected:
- virtual void do_quit ();
- virtual void construct_children ();
- virtual void process (Moment);
- vector<Pitch> pending_pitch (Moment) const;
private:
- SCM split_list_;
- Direction where_dir_;
- void change_to (Music_iterator *, SCM, string);
- Moment start_moment_;
-
- Context_handle up_;
- Context_handle down_;
+ virtual void change_to (const string &id);
};
void
-Auto_change_iterator::change_to (Music_iterator *it, SCM to_type_sym,
- string to_id)
-{
- Context *current = it->get_outlet ();
- Context *last = 0;
-
- /*
- Cut & Paste from Change_iterator (ugh).
-
- TODO: abstract this function
- */
-
- /* find the type of translator that we're changing.
-
- If \translator Staff = bass, then look for Staff = *
- */
- while (current && !current->is_alias (to_type_sym))
- {
- last = current;
- current = current->get_parent_context ();
- }
-
- if (current && current->id_string () == to_id)
- {
- string msg;
- msg += _f ("cannot change, already in translator: %s", to_id);
- }
-
- if (current)
- {
- if (last)
- {
- Context *dest
- = it->get_outlet ()->find_create_context (to_type_sym, to_id, SCM_EOL);
-
- send_stream_event (last, "ChangeParent", get_music ()->origin (),
- ly_symbol2scm ("context"), dest->self_scm ());
- }
- else
- {
- /*
- We could change the current translator's id, but that would make
- errors hard to catch
-
- */
- ;
- }
- }
-}
-
-void
-Auto_change_iterator::process (Moment m)
-{
- Music_wrapper_iterator::process (m);
-
- Moment now = get_outlet ()->now_mom ();
- Moment *splitm = 0;
- if (start_moment_.main_part_.is_infinity () && start_moment_ < 0)
- start_moment_ = now;
-
- for (; scm_is_pair (split_list_); split_list_ = scm_cdr (split_list_))
- {
- splitm = unsmob_moment (scm_caar (split_list_));
- if ((*splitm + start_moment_) > now)
- break;
-
- SCM tag = scm_cdar (split_list_);
- Direction d = to_dir (tag);
-
- if (d && d != where_dir_)
- {
- where_dir_ = d;
- string to_id = (d >= 0) ? "up" : "down";
- change_to (child_iter_,
- ly_symbol2scm ("Staff"),
- to_id);
- }
- }
-}
-
-Auto_change_iterator::Auto_change_iterator ()
-{
- where_dir_ = CENTER;
- split_list_ = SCM_EOL;
-}
-
-void
-Auto_change_iterator::construct_children ()
-{
- split_list_ = get_music ()->get_property ("split-list");
- start_moment_ = get_outlet ()->now_mom ();
-
- SCM props = get_outlet ()->get_property ("trebleStaffProperties");
- Context *up = get_outlet ()->find_create_context (ly_symbol2scm ("Staff"),
- "up", props);
-
- props = get_outlet ()->get_property ("bassStaffProperties");
- Context *down = get_outlet ()->find_create_context (ly_symbol2scm ("Staff"),
- "down", props);
-
- up_.set_context (up);
- down_.set_context (down);
-
- Context *voice = up->find_create_context (ly_symbol2scm ("Voice"),
- "", SCM_EOL);
- set_context (voice);
- Music_wrapper_iterator::construct_children ();
-}
-
-void
-Auto_change_iterator::do_quit ()
+Auto_change_iterator::change_to (const string &id)
{
- up_.set_context (0);
- down_.set_context (0);
+ // N.B. change_to() returns an error message. Silence is the legacy
+ // behavior here, but maybe that should be changed.
+ Change_iterator::change_to (*child_iter_, ly_symbol2scm ("Staff"), id);
}
IMPLEMENT_CTOR_CALLBACK (Auto_change_iterator);