Web-ja: update introduction

[lilypond.git] / lily / staff-symbol-engraver.cc

diff --git a/lily/staff-symbol-engraver.cc b/lily/staff-symbol-engraver.cc
index 0b0d212a90502006e121fca8c19d0b66d60002c5..fad9f0437900d5765301d6eb82376b9ce714d38e 100644 (file)
--- a/lily/staff-symbol-engraver.cc
+++ b/lily/staff-symbol-engraver.cc
@@ -1,9 +1,20 @@
 /*
-  staff-symbol-engraver.cc -- implement Staff_symbol_engraver
+  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--2007 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
+  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 "engraver.hh"
@@ -31,27 +42,41 @@ protected:
 
   void stop_translation_timestep ();
   virtual ~Staff_symbol_engraver ();
-  DECLARE_ACKNOWLEDGER (grob);
-  DECLARE_TRANSLATOR_LISTENER (staff_span);
+  void acknowledge_grob (Grob_info);
+  void listen_staff_span (Stream_event *);
   virtual void finalize ();
   void process_music ();
+  virtual void derived_mark () const;
 };
 
+void
+Staff_symbol_engraver::derived_mark () const
+{
+  for (LEFT_and_RIGHT (d))
+    {
+      if (span_events_[d])
+        scm_gc_mark (span_events_[d]->self_scm ());
+    }
+}
+
 Staff_symbol_engraver::~Staff_symbol_engraver ()
 {
-  assert (!span_);
+  if (span_)
+    {
+      // Somehow finalize() was not called?
+      programming_error ("Have a pending spanner in destructor.");
+    }
 }
 
-Staff_symbol_engraver::Staff_symbol_engraver ()
+Staff_symbol_engraver::Staff_symbol_engraver (Context *c)
+  : Engraver (c)
 {
   finished_span_ = 0;
   first_start_ = true;
   span_ = 0;
-  span_events_[LEFT] = 0;
-  span_events_[RIGHT] = 0;
+  span_events_.set (0, 0);
 }
 
-IMPLEMENT_TRANSLATOR_LISTENER (Staff_symbol_engraver, staff_span);
 void
 Staff_symbol_engraver::listen_staff_span (Stream_event *ev)
 {
@@ -59,7 +84,7 @@ Staff_symbol_engraver::listen_staff_span (Stream_event *ev)
   if (d)
     ASSIGN_EVENT_ONCE (span_events_[d], ev);
   else
-    programming_error (_ ("staff-span event has no direction"));
+    programming_error ("staff-span event has no direction");
 }
 
 void
@@ -70,7 +95,7 @@ Staff_symbol_engraver::process_music ()
       finished_span_ = span_;
       span_ = 0;
       if (first_start_)
-       first_start_ = false;
+        first_start_ = false;
     }
 
   if (span_events_[START]
@@ -85,7 +110,7 @@ Staff_symbol_engraver::start_spanner ()
     {
       span_ = make_spanner ("StaffSymbol", SCM_EOL);
       span_->set_bound (LEFT,
-                       unsmob_grob (get_property ("currentCommandColumn")));
+                        unsmob<Grob> (get_property ("currentCommandColumn")));
     }
 }
 
@@ -96,13 +121,13 @@ Staff_symbol_engraver::stop_spanner ()
     return;
 
   if (!finished_span_->get_bound (RIGHT))
-    finished_span_->set_bound (RIGHT, unsmob_grob (get_property ("currentCommandColumn")));
-  
+    finished_span_->set_bound (RIGHT, unsmob<Grob> (get_property ("currentCommandColumn")));
+
   announce_end_grob (finished_span_,
-                    span_events_[STOP]
-                    ? span_events_[STOP]->self_scm ()
-                    : SCM_EOL);
-  
+                     span_events_[STOP]
+                     ? span_events_[STOP]->self_scm ()
+                     : SCM_EOL);
+
   finished_span_ = 0;
 }
 
@@ -111,12 +136,9 @@ Staff_symbol_engraver::stop_translation_timestep ()
 {
   if ((span_events_[START] || first_start_)
       && span_)
-    {
-      first_start_ = false;
-    }
+    first_start_ = false;
 
-  span_events_[START] = 0;
-  span_events_[STOP] = 0;
+  span_events_.set (0, 0);
   stop_spanner ();
 }
 
@@ -134,10 +156,6 @@ Staff_symbol_engraver::finalize ()
 void
 Staff_symbol_engraver::acknowledge_grob (Grob_info s)
 {
-  /*
-    Perhaps should try to take SeparationItem as bound of the staff
-    symbol?
-  */
   if (span_ || finished_span_)
     {
       Spanner *my = span_ ? span_ : finished_span_;
@@ -145,11 +163,24 @@ Staff_symbol_engraver::acknowledge_grob (Grob_info s)
     }
 }
 
-ADD_ACKNOWLEDGER (Staff_symbol_engraver, grob);
+
+void
+Staff_symbol_engraver::boot ()
+{
+  ADD_LISTENER (Staff_symbol_engraver, staff_span);
+  ADD_ACKNOWLEDGER (Staff_symbol_engraver, grob);
+}
 
 ADD_TRANSLATOR (Staff_symbol_engraver,
-               /* doc */ "Create the constellation of five (default) "
-               "staff lines.",
-               /* create */ "StaffSymbol",
-               /* read */ "",
-               /* write */ "");
+                /* doc */
+                "Create the constellation of five (default) staff lines.",
+
+                /* create */
+                "StaffSymbol ",
+
+                /* read */
+                "",
+
+                /* write */
+                ""
+               );