* VERSION (MY_PATCH_LEVEL): make 1.7.0

[lilypond.git] / lily / auto-change-iterator.cc

diff --git a/lily/auto-change-iterator.cc b/lily/auto-change-iterator.cc
index 7b4b7b1450181cec69dc4cad18591e24c553a840..74d345ee1470cbab47e9da292a9ce1d3eb855dfb 100644 (file)
--- a/lily/auto-change-iterator.cc
+++ b/lily/auto-change-iterator.cc
@@ -3,11 +3,11 @@
 
   source file of the GNU LilyPond music typesetter
   
-  (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1999--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   
  */
 
-#include "auto-change-music.hh"
+#include "music.hh"
 #include "auto-change-iterator.hh"
 #include "translator-group.hh"
 #include "musical-request.hh"
@@ -18,7 +18,7 @@ void
 Auto_change_iterator::change_to (Music_iterator *it, String to_type,
                                 String to_id)
 {
-  Translator_group * current = it->report_to_l ();
+  Translator_group * current = it->report_to ();
   Translator_group * last = 0;
 
   /*
@@ -31,13 +31,13 @@ Auto_change_iterator::change_to (Music_iterator *it, String to_type,
      
      If \translator Staff = bass, then look for Staff = *
    */
-  while  (current && current->type_str_ != to_type)
+  while (current && current->type_string_ != to_type)
     {
       last = current;
-      current = current->daddy_trans_l_;
+      current = current->daddy_trans_;
     }
 
-  if (current && current->id_str_ == to_id)
+  if (current && current->id_string_ == to_id)
     {
       String msg;
       msg += _ ("Can't switch translators, I'm there already");
@@ -47,9 +47,9 @@ Auto_change_iterator::change_to (Music_iterator *it, String to_type,
     if (last)
       {
        Translator_group * dest = 
-         it->report_to_l ()->find_create_translator_l (to_type, to_id);
-       current->remove_translator_p (last);
-       dest->add_translator (last);
+         it->report_to ()->find_create_translator (to_type, to_id);
+       current->remove_translator (last);
+       dest->add_used_group_translator (last);
       }
     else
       {
@@ -57,7 +57,7 @@ Auto_change_iterator::change_to (Music_iterator *it, String to_type,
          We could change the current translator's id, but that would make 
          errors hard to catch
          
-          last->translator_id_str_  = change_l ()->change_to_id_str_;
+          last->translator_id_string_  = get_change ()->change_to_id_string_;
        */
        //      error (_ ("I'm one myself"));
       }
@@ -66,30 +66,80 @@ Auto_change_iterator::change_to (Music_iterator *it, String to_type,
 
 }
 
-void
-Auto_change_iterator::do_process_and_next (Moment m)
+/*
+  Look ahead to find first pitches to determine staff position.
+  WARNING: this means that
+
+  \autochange Staff \notes { .... \context Staff = otherstaff { .. } .. }
+
+  will confuse the autochanger, since it will not notice that the
+  music for OTHERSTAFF is not his.
+
+  PRECONDITION: this->ok () holds.
+*/
+Array<Pitch>
+Auto_change_iterator::pending_pitch (Moment m) const
 {
-  Music_wrapper_iterator::do_process_and_next (m);
-  Pitch_interrogate_req spanish_inquisition; // nobody expects it
+  Music_iterator * iter = child_iter_ ->clone ();
+  Array<Pitch> ps;
+  while (1)
+    {
+      SCM muses = iter->get_pending_events (m);
+      for (SCM s = muses; gh_pair_p (s); s=ly_cdr (s))
+       if (Note_req* nr = dynamic_cast<Note_req*> (unsmob_music (ly_car (s))))
+         {
+           ps.push (*unsmob_pitch (nr->get_mus_property ("pitch")));
+         }
+
+      if (ps.size ())
+       break;
+
+      iter->skip (m);
+      if (!iter->ok ())
+       break;
+      
+      m = iter->pending_moment ();
+    }
+
+  scm_gc_unprotect_object (iter->self_scm());
 
-  Music_iterator *it = try_music (&spanish_inquisition);
+  return ps;
+}
+
+void
+Auto_change_iterator::process (Moment m)
+{
+  /*
+    first we get the pitches, then we do the real work.
+    Music_wrapper_iterator::process () might process (and throw away)
+    pitches we need.  */
+  Array<Pitch> ps = pending_pitch (m);
 
-  if (it && spanish_inquisition.pitch_arr_.size ())
+  Music_wrapper_iterator::process (m);
+  if (ps.size ())
     {
-      Musical_pitch p = spanish_inquisition.pitch_arr_[0];
-      Direction s = Direction (sign(p.steps ()));
-      if (s != where_dir_)
+      Pitch p = ps[0];
+      Direction s = Direction (sign (p.steps ()));
+      /*
+       Don't change for central C.
+
+       TODO: make this tunable somehow. Sometimes, you'd want to
+       switch for C.C. as well.
+
+      */
+      if (s && s != where_dir_)
        {
          where_dir_ = s;
-         String to_id =  (s >= 0) ?  "up" : "down";
-         Auto_change_music const * auto_mus = dynamic_cast<Auto_change_music const* > (music_l_);
-
-         change_to (it, auto_mus->what_str_, to_id);     
+         String to_id = (s >= 0) ?  "up" : "down";
+         String wh = ly_scm2string (get_music ()->get_mus_property ("what"));
+         change_to (child_iter_, wh, to_id);     
        }
     }
 }
 
-Auto_change_iterator::Auto_change_iterator( )
+Auto_change_iterator::Auto_change_iterator ()
 {
   where_dir_ = CENTER;
 }
+
+IMPLEMENT_CTOR_CALLBACK (Auto_change_iterator);