Imported Upstream version 2.14.2

[lilypond.git] / lily / episema-engraver.cc

diff --git a/lily/episema-engraver.cc b/lily/episema-engraver.cc
new file mode 100644 (file)
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+++ b/lily/episema-engraver.cc
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+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2010--2011 Neil Puttock <n.puttock@gmail.com>
+
+  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"
+#include "international.hh"
+#include "note-column.hh"
+#include "pointer-group-interface.hh"
+#include "side-position-interface.hh"
+#include "spanner.hh"
+#include "stream-event.hh"
+
+#include "translator.icc"
+
+class Episema_engraver : public Engraver
+{
+public:
+  TRANSLATOR_DECLARATIONS (Episema_engraver);
+protected:
+  virtual void finalize ();
+  DECLARE_TRANSLATOR_LISTENER (episema);
+  DECLARE_ACKNOWLEDGER (note_column);
+  DECLARE_ACKNOWLEDGER (note_head);
+  void stop_translation_timestep ();
+  void process_music ();
+
+private:
+  Spanner *span_;
+  Spanner *finished_;
+  Stream_event *current_event_;
+  Drul_array<Stream_event *> event_drul_;
+  vector<Grob *> note_columns_;
+  void typeset_all ();
+};
+
+Episema_engraver::Episema_engraver ()
+{
+  finished_ = 0;
+  current_event_ = 0;
+  span_ = 0;
+  event_drul_.set (0, 0);
+}
+
+IMPLEMENT_TRANSLATOR_LISTENER (Episema_engraver, episema);
+void
+Episema_engraver::listen_episema (Stream_event *ev)
+{
+  Direction d = to_dir (ev->get_property ("span-direction"));
+  // Must not ASSIGN_EVENT_ONCE here, since episema
+  // can be typeset over a single neume
+  event_drul_[d] = ev;
+}
+
+void
+Episema_engraver::process_music ()
+{
+  if (event_drul_[START])
+    {
+      if (current_event_)
+       event_drul_[START]->origin ()->warning (_ ("already have an episema"));
+      else
+       {
+         current_event_ = event_drul_[START];
+         span_ = make_spanner ("Episema", event_drul_[START]->self_scm ());
+
+         event_drul_[START] = 0;
+       }
+    }
+  if (event_drul_[STOP])
+    {
+      if (!span_)
+       event_drul_[STOP]
+         ->origin ()->warning (_ ("cannot find start of episema"));
+      else
+       {
+         finished_ = span_;
+         announce_end_grob (finished_, SCM_EOL);
+         span_ = 0;
+         current_event_ = 0;
+         note_columns_.clear ();
+       }
+    }
+}
+
+void
+Episema_engraver::typeset_all ()
+{
+  if (finished_)
+    {
+      if (!finished_->get_bound (RIGHT))
+       {
+         Grob *col = (note_columns_.size ()
+                      ? note_columns_.back ()
+                      : unsmob_grob (get_property ("currentMusicalColumn")));
+         finished_->set_bound (RIGHT, col);
+       }
+      finished_ = 0;
+    }
+}
+
+void
+Episema_engraver::stop_translation_timestep ()
+{
+  if (span_ && !span_->get_bound (LEFT))
+    {
+      Grob *col = (note_columns_.size ()
+                  ? note_columns_.front ()
+                  : unsmob_grob (get_property ("currentMusicalColumn")));
+      span_->set_bound (LEFT, col);
+    }
+
+  typeset_all ();
+  event_drul_.set (0, 0);
+}
+
+void
+Episema_engraver::finalize ()
+{
+  typeset_all ();
+  if (span_)
+    {
+      current_event_->origin ()->warning (_ ("unterminated episema"));
+      span_->suicide ();
+      span_ = 0;
+    }
+}
+
+void
+Episema_engraver::acknowledge_note_column (Grob_info info)
+{
+  note_columns_.push_back (info.grob ());
+}
+
+void
+Episema_engraver::acknowledge_note_head (Grob_info info)
+{
+  if (span_)
+    {
+      Side_position_interface::add_support (span_, info.grob ());
+      add_bound_item (span_, info.grob ());
+    }
+  else if (finished_)
+    {
+      Side_position_interface::add_support (finished_, info.grob ());
+      add_bound_item (finished_, info.grob ());
+    }
+}
+
+ADD_ACKNOWLEDGER (Episema_engraver, note_column);
+ADD_ACKNOWLEDGER (Episema_engraver, note_head);
+
+ADD_TRANSLATOR (Episema_engraver,
+               /* doc */
+               "Create an @emph{Editio Vaticana}-style episema line.",
+
+               /* create */
+               "Episema ",
+
+               /* read */
+               "",
+
+               /* write */
+               ""
+               );