lily/stanza-number-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>, Glen Prideaux <glenprideaux@iname.com>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "engraver.hh"
  21 #include "side-position-interface.hh"
  22 #include "text-interface.hh"
  23 #include "item.hh"
  24
  25 class Stanza_number_engraver : public Engraver
  26 {
  27   Item *text_;
  28
  29   SCM last_stanza_;
  30 public:
  31   TRANSLATOR_DECLARATIONS (Stanza_number_engraver);
  32   void process_music ();
  33   virtual void derived_mark () const;
  34   void stop_translation_timestep ();
  35   DECLARE_ACKNOWLEDGER (lyric_syllable);
  36 };
  37
  38 void
  39 Stanza_number_engraver::derived_mark () const
  40 {
  41   scm_gc_mark (last_stanza_);
  42 }
  43
  44 /*
  45   TODO: should make engraver that collects all the stanzas on a higher
  46   level, and then groups them to the side. Stanza numbers should be
  47   all aligned.
  48 */
  49
  50 Stanza_number_engraver::Stanza_number_engraver ()
  51 {
  52   text_ = 0;
  53   last_stanza_ = SCM_EOL;
  54 }
  55
  56 void
  57 Stanza_number_engraver::process_music ()
  58 {
  59   SCM stanza = get_property ("stanza");
  60
  61   if (Text_interface::is_markup (stanza)
  62       && stanza != last_stanza_)
  63     {
  64       last_stanza_ = stanza;
  65
  66       text_ = make_item ("StanzaNumber", SCM_EOL);
  67       text_->set_property ("text", stanza);
  68     }
  69 }
  70
  71 void
  72 Stanza_number_engraver::acknowledge_lyric_syllable (Grob_info inf)
  73 {
  74   if (text_)
  75     Side_position_interface::add_support (text_, inf.grob ());
  76 }
  77
  78 void
  79 Stanza_number_engraver::stop_translation_timestep ()
  80 {
  81   text_ = 0;
  82 }
  83
  84 #include "translator.icc"
  85
  86 ADD_ACKNOWLEDGER (Stanza_number_engraver, lyric_syllable);
  87 ADD_TRANSLATOR (Stanza_number_engraver,
  88                 /* doc */
  89                 "Engrave stanza numbers.",
  90
  91                 /* create */
  92                 "StanzaNumber ",
  93
  94                 /* read */
  95                 "stanza ",
  96
  97                 /* write */
  98                 ""
  99                 );