Doc-es: various updates.

[lilypond.git] / lily / completion-note-heads-engraver.cc

diff --git a/lily/completion-note-heads-engraver.cc b/lily/completion-note-heads-engraver.cc
index 5775ef188a17e8bbd2cd3ab45c001115a1782d77..18b51cd4ec9440217301156565d22dc11addf128 100644 (file)
--- a/lily/completion-note-heads-engraver.cc
+++ b/lily/completion-note-heads-engraver.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1997--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1997--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
@@ -59,7 +59,7 @@ class Completion_heads_engraver : public Engraver
   vector<Item *> notes_;
   vector<Item *> prev_notes_;
   // Must remember notes for explicit ties.
-  vector<Grob *> ties_;
+  vector<Spanner *> ties_;
   vector<Stream_event *> note_events_;
   Spanner *tie_column_;
   Moment note_end_mom_;
@@ -80,7 +80,7 @@ protected:
   void start_translation_timestep ();
   void process_music ();
   void stop_translation_timestep ();
-  DECLARE_TRANSLATOR_LISTENER (note);
+  void listen_note (Stream_event *);
 };
 
 void
@@ -89,7 +89,6 @@ Completion_heads_engraver::initialize ()
   is_first_ = false;
 }
 
-IMPLEMENT_TRANSLATOR_LISTENER (Completion_heads_engraver, note);
 void
 Completion_heads_engraver::listen_note (Stream_event *ev)
 {
@@ -109,15 +108,21 @@ Completion_heads_engraver::listen_note (Stream_event *ev)
 Moment
 Completion_heads_engraver::next_moment (Rational const &note_len)
 {
-  Moment *e = unsmob_moment (get_property ("measurePosition"));
-  Moment *l = unsmob_moment (get_property ("measureLength"));
+  Moment *e = unsmob<Moment> (get_property ("measurePosition"));
+  Moment *l = unsmob<Moment> (get_property ("measureLength"));
   if (!e || !l || !to_boolean (get_property ("timing")))
     {
       return Moment (0, 0);
     }
 
   Moment result = *l - *e;
-  Moment const *unit = unsmob_moment (get_property ("completionUnit"));
+  if (result < 0)
+    {
+      programming_error ("invalid measure position: "
+                         + e->to_string () + " of " + l->to_string ());
+      return 0;
+    }
+  Moment const *unit = unsmob<Moment> (get_property ("completionUnit"));
 
   if (unit)
     {
@@ -156,9 +161,9 @@ Item *
 Completion_heads_engraver::make_note_head (Stream_event *ev)
 {
   Item *note = make_item ("NoteHead", ev->self_scm ());
-  Pitch *pit = unsmob_pitch (ev->get_property ("pitch"));
+  Pitch *pit = unsmob<Pitch> (ev->get_property ("pitch"));
 
-  int pos = pit->steps ();
+  int pos = pit ? pit->steps () : 0;
   SCM c0 = get_property ("middleCPosition");
   if (scm_is_number (c0))
     pos += scm_to_int (c0);
@@ -192,7 +197,7 @@ Completion_heads_engraver::process_music ()
     }
   else
     {
-      orig = unsmob_duration (note_events_[0]->get_property ("duration"));
+      orig = unsmob<Duration> (note_events_[0]->get_property ("duration"));
       note_dur = *orig;
       SCM factor = get_property ("completionFactor");
       if (ly_is_procedure (factor))
@@ -265,7 +270,7 @@ Completion_heads_engraver::process_music ()
 void
 Completion_heads_engraver::make_tie (Grob *left, Grob *right)
 {
-  Grob *p = make_spanner ("Tie", SCM_EOL);
+  Spanner *p = make_spanner ("Tie", SCM_EOL);
   Tie::set_head (p, LEFT, left);
   Tie::set_head (p, RIGHT, right);
   announce_end_grob (p, SCM_EOL);
@@ -296,11 +301,18 @@ Completion_heads_engraver::start_translation_timestep ()
                             ly_bool2scm (note_events_.size ()));
 }
 
-Completion_heads_engraver::Completion_heads_engraver ()
+Completion_heads_engraver::Completion_heads_engraver (Context *c)
+  : Engraver (c)
 {
   tie_column_ = 0;
 }
 
+void
+Completion_heads_engraver::boot ()
+{
+  ADD_LISTENER (Completion_heads_engraver, note);
+}
+
 ADD_TRANSLATOR (Completion_heads_engraver,
                 /* doc */
                 "This engraver replaces @code{Note_heads_engraver}.  It plays"