lily/lyric-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5   Jan Nieuwenhuizen <janneke@gnu.org>
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "context.hh"
  22 #include "engraver.hh"
  23 #include "item.hh"
  24 #include "note-head.hh"
  25 #include "stream-event.hh"
  26 #include "international.hh"
  27
  28 #include "translator.icc"
  29
  30 /**
  31    Generate texts for lyric syllables.  We only do one lyric at a time.
  32    Multiple copies of this engraver should be used to do multiple voices.
  33 */
  34 class Lyric_engraver : public Engraver
  35 {
  36 protected:
  37   void stop_translation_timestep ();
  38   void process_music ();
  39   DECLARE_TRANSLATOR_LISTENER (lyric);
  40
  41 public:
  42   TRANSLATOR_DECLARATIONS (Lyric_engraver);
  43
  44 private:
  45   Stream_event *event_;
  46   Item *text_;
  47   Item *last_text_;
  48
  49   Context *get_voice_context ();
  50 };
  51
  52 Lyric_engraver::Lyric_engraver ()
  53 {
  54   text_ = 0;
  55   last_text_ = 0;
  56   event_ = 0;
  57 }
  58
  59 IMPLEMENT_TRANSLATOR_LISTENER (Lyric_engraver, lyric);
  60 void
  61 Lyric_engraver::listen_lyric (Stream_event *ev)
  62 {
  63   ASSIGN_EVENT_ONCE (event_, ev);
  64 }
  65
  66 void
  67 Lyric_engraver::process_music ()
  68 {
  69   if (event_)
  70     {
  71       SCM text = event_->get_property ("text");
  72
  73       if (ly_is_equal (text, scm_from_locale_string (" ")))
  74         {
  75           if (last_text_)
  76             last_text_->set_property ("self-alignment-X",
  77                                       get_property ("lyricMelismaAlignment"));
  78         }
  79       else
  80         text_ = make_item ("LyricText", event_->self_scm ());
  81     }
  82 }
  83
  84 Context *
  85 get_voice_to_lyrics (Context *lyrics)
  86 {
  87   SCM avc = lyrics->get_property ("associatedVoiceContext");
  88   if (Context *c = unsmob_context (avc))
  89     return c;
  90
  91   SCM voice_name = lyrics->get_property ("associatedVoice");
  92   string nm = lyrics->id_string ();
  93
  94   if (scm_is_string (voice_name))
  95     nm = ly_scm2string (voice_name);
  96   else if (nm == "")
  97     return 0;
  98   else
  99     {
 100       ssize idx = nm.rfind ('-');
 101       if (idx != NPOS)
 102         nm = nm.substr (0, idx);
 103     }
 104
 105   Context *parent = lyrics;
 106   Context *voice = 0;
 107   while (parent && !voice)
 108     {
 109       voice = find_context_below (parent, ly_symbol2scm ("Voice"), nm);
 110       parent = parent->get_parent_context ();
 111     }
 112
 113   if (voice)
 114     return voice;
 115
 116   parent = lyrics;
 117   voice = 0;
 118   while (parent && !voice)
 119     {
 120       voice = find_context_below (parent, ly_symbol2scm ("Voice"), "");
 121       parent = parent->get_parent_context ();
 122     }
 123
 124   return voice;
 125 }
 126
 127 Grob *
 128 get_current_note_head (Context *voice, bool include_grace_notes)
 129 {
 130   Moment now = voice->now_mom ();
 131   for (SCM s = voice->get_property ("busyGrobs");
 132        scm_is_pair (s); s = scm_cdr (s))
 133     {
 134       Grob *g = unsmob_grob (scm_cdar (s));;
 135       Moment *end_mom = unsmob_moment (scm_caar (s));
 136       if (!end_mom || !g)
 137         {
 138           programming_error ("busyGrobs invalid");
 139           continue;
 140         }
 141
 142       if (((end_mom->main_part_ > now.main_part_) ||
 143            (include_grace_notes && end_mom->grace_part_ > now.grace_part_))
 144           && dynamic_cast<Item *> (g)
 145           && Note_head::has_interface (g))
 146         {
 147           return g;
 148         }
 149     }
 150
 151   return 0;
 152 }
 153
 154 void
 155 Lyric_engraver::stop_translation_timestep ()
 156 {
 157   if (text_)
 158     {
 159       Context *voice = get_voice_to_lyrics (context ());
 160
 161       if (voice)
 162         {
 163           bool include_grace_notes = to_boolean (get_property ("includeGraceNotes"));
 164           Grob *head = get_current_note_head (voice, include_grace_notes);
 165
 166           if (head)
 167             {
 168               text_->set_parent (head, X_AXIS);
 169               if (melisma_busy (voice)
 170                   && !to_boolean (get_property ("ignoreMelismata")))
 171                 text_->set_property ("self-alignment-X",
 172                                      get_property ("lyricMelismaAlignment"));
 173             }
 174           else
 175             {
 176               text_->warning (_ ("Lyric syllable does not have note. Use \\lyricsto or associatedVoice."));
 177               text_->set_property ("X-offset", scm_from_int (0));
 178             }
 179         }
 180
 181       last_text_ = text_;
 182       text_ = 0;
 183     }
 184   event_ = 0;
 185 }
 186
 187 ADD_TRANSLATOR (Lyric_engraver,
 188                 /* doc */
 189                 "Engrave text for lyrics.",
 190
 191                 /* create */
 192                 "LyricText ",
 193
 194                 /* read */
 195                 "ignoreMelismata "
 196                 "includeGraceNotes "
 197                 "lyricMelismaAlignment ",
 198
 199                 /* write */
 200                 ""
 201                 );