lily/hyphen-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1999--2010 Glen Prideaux <glenprideaux@iname.com>,
   5   Han-Wen Nienhuys <hanwen@xs4all.nl>,
   6   Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8   LilyPond is free software: you can redistribute it and/or modify
   9   it under the terms of the GNU General Public License as published by
  10   the Free Software Foundation, either version 3 of the License, or
  11   (at your option) any later version.
  12
  13   LilyPond is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include "engraver.hh"
  23 #include "international.hh"
  24 #include "item.hh"
  25 #include "pointer-group-interface.hh"
  26 #include "spanner.hh"
  27 #include "stream-event.hh"
  28 #include "warn.hh"
  29
  30 #include "translator.icc"
  31
  32 class Hyphen_engraver : public Engraver
  33 {
  34   Stream_event *ev_;
  35   Stream_event *finished_ev_;
  36
  37   Spanner *hyphen_;
  38   Spanner *finished_hyphen_;
  39
  40 public:
  41   TRANSLATOR_DECLARATIONS (Hyphen_engraver);
  42
  43 protected:
  44
  45   DECLARE_ACKNOWLEDGER (lyric_syllable);
  46   DECLARE_TRANSLATOR_LISTENER (hyphen);
  47
  48   virtual void finalize ();
  49
  50   void stop_translation_timestep ();
  51   void process_music ();
  52 };
  53
  54 Hyphen_engraver::Hyphen_engraver ()
  55 {
  56   hyphen_ = 0;
  57   finished_hyphen_ = 0;
  58   finished_ev_ = 0;
  59   ev_ = 0;
  60 }
  61
  62 void
  63 Hyphen_engraver::acknowledge_lyric_syllable (Grob_info i)
  64 {
  65   Item *item = i.item ();
  66
  67   if (!hyphen_)
  68     hyphen_ = make_spanner ("LyricSpace", item->self_scm ());
  69
  70   if (hyphen_)
  71     hyphen_->set_bound (LEFT, item);
  72
  73   if (finished_hyphen_)
  74     finished_hyphen_->set_bound (RIGHT, item);
  75 }
  76
  77 IMPLEMENT_TRANSLATOR_LISTENER (Hyphen_engraver, hyphen);
  78 void
  79 Hyphen_engraver::listen_hyphen (Stream_event *ev)
  80 {
  81   ASSIGN_EVENT_ONCE (ev_, ev);
  82 }
  83
  84 void
  85 completize_hyphen (Spanner *sp)
  86 {
  87   if (!sp->get_bound (RIGHT))
  88     {
  89       extract_item_set (sp, "heads", heads);
  90       if (heads.size ())
  91         sp->set_bound (RIGHT, heads.back ());
  92     }
  93 }
  94
  95 void
  96 Hyphen_engraver::finalize ()
  97 {
  98   if (hyphen_)
  99     {
 100       completize_hyphen (hyphen_);
 101
 102       if (!hyphen_->get_bound (RIGHT))
 103         {
 104           hyphen_->warning (_ ("removing unterminated hyphen"));
 105           hyphen_->suicide ();
 106         }
 107
 108       hyphen_ = 0;
 109     }
 110
 111   if (finished_hyphen_)
 112     {
 113       completize_hyphen (finished_hyphen_);
 114
 115       if (!finished_hyphen_->get_bound (RIGHT))
 116         {
 117           if (finished_ev_)
 118             finished_hyphen_->warning (_ ("unterminated hyphen; removing"));
 119           finished_hyphen_->suicide ();
 120         }
 121       finished_hyphen_ = 0;
 122     }
 123 }
 124
 125 void
 126 Hyphen_engraver::process_music ()
 127 {
 128   if (ev_)
 129     hyphen_ = make_spanner ("LyricHyphen", ev_->self_scm ());
 130 }
 131
 132 void
 133 Hyphen_engraver::stop_translation_timestep ()
 134 {
 135   if (finished_hyphen_ && finished_hyphen_->get_bound (RIGHT))
 136     {
 137       finished_hyphen_ = 0;
 138       finished_ev_ = 0;
 139     }
 140
 141   if (finished_hyphen_ && hyphen_)
 142     {
 143       programming_error ("hyphen not finished yet");
 144       finished_hyphen_ = 0;
 145       finished_ev_ = 0;
 146     }
 147
 148   if (hyphen_)
 149     {
 150       finished_hyphen_ = hyphen_;
 151       finished_ev_ = ev_;
 152     }
 153
 154   hyphen_ = 0;
 155   ev_ = 0;
 156 }
 157
 158 ADD_ACKNOWLEDGER (Hyphen_engraver, lyric_syllable);
 159
 160 ADD_TRANSLATOR (Hyphen_engraver,
 161                 /* doc */
 162                 "Create lyric hyphens and distance constraints between words.",
 163
 164                 /* create */
 165                 "LyricHyphen "
 166                 "LyricSpace ",
 167
 168                 /* read */
 169                 "",
 170
 171                 /* write */
 172                 ""
 173                 );