lily/lyric-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 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", scm_from_int (LEFT));
  77         }
  78       else
  79         text_ = make_item ("LyricText", event_->self_scm ());
  80     }
  81 }
  82
  83 Context *
  84 get_voice_to_lyrics (Context *lyrics)
  85 {
  86   SCM avc = lyrics->get_property ("associatedVoiceContext");
  87   if (Context *c = unsmob_context (avc))
  88     return c;
  89
  90   SCM voice_name = lyrics->get_property ("associatedVoice");
  91   string nm = lyrics->id_string ();
  92
  93   if (scm_is_string (voice_name))
  94     nm = ly_scm2string (voice_name);
  95   else if (nm == "")
  96     return 0;
  97   else
  98     {
  99       ssize idx = nm.rfind ('-');
 100       if (idx != NPOS)
 101         nm = nm.substr (0, idx);
 102     }
 103
 104   Context *parent = lyrics;
 105   Context *voice = 0;
 106   while (parent && !voice)
 107     {
 108       voice = find_context_below (parent, ly_symbol2scm ("Voice"), nm);
 109       parent = parent->get_parent_context ();
 110     }
 111
 112   if (voice)
 113     return voice;
 114
 115   parent = lyrics;
 116   voice = 0;
 117   while (parent && !voice)
 118     {
 119       voice = find_context_below (parent, ly_symbol2scm ("Voice"), "");
 120       parent = parent->get_parent_context ();
 121     }
 122
 123   return voice;
 124 }
 125
 126 Grob *
 127 get_current_note_head (Context *voice)
 128 {
 129   Moment now = voice->now_mom ();
 130   for (SCM s = voice->get_property ("busyGrobs");
 131        scm_is_pair (s); s = scm_cdr (s))
 132     {
 133       Grob *g = unsmob_grob (scm_cdar (s));;
 134       Moment *end_mom = unsmob_moment (scm_caar (s));
 135       if (!end_mom || !g)
 136         {
 137           programming_error ("busyGrobs invalid");
 138           continue;
 139         }
 140
 141       if (end_mom->main_part_ > now.main_part_
 142           && dynamic_cast<Item *> (g)
 143           && Note_head::has_interface (g))
 144         return g;
 145     }
 146
 147   return 0;
 148 }
 149
 150 void
 151 Lyric_engraver::stop_translation_timestep ()
 152 {
 153   if (text_)
 154     {
 155       Context *voice = get_voice_to_lyrics (context ());
 156
 157       if (voice)
 158         {
 159           Grob *head = get_current_note_head (voice);
 160
 161           if (head)
 162             {
 163               text_->set_parent (head, X_AXIS);
 164               if (melisma_busy (voice)
 165                   && !to_boolean (get_property ("ignoreMelismata")))
 166                 text_->set_property ("self-alignment-X",
 167                                      get_property ("lyricMelismaAlignment"));
 168             }
 169           else
 170             {
 171               text_->warning (_ ("Lyric syllable does not have note. Use \\lyricsto or associatedVoice."));
 172               text_->set_property ("X-offset", scm_from_int (0));
 173             }
 174         }
 175
 176       last_text_ = text_;
 177       text_ = 0;
 178     }
 179   event_ = 0;
 180 }
 181
 182 ADD_TRANSLATOR (Lyric_engraver,
 183                 /* doc */
 184                 "Engrave text for lyrics.",
 185
 186                 /* create */
 187                 "LyricText ",
 188
 189                 /* read */
 190                 "ignoreMelismata "
 191                 "lyricMelismaAlignment ",
 192
 193                 /* write */
 194                 ""
 195                 );