lily/grace-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2004--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   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 "context.hh"
  22 #include "warn.hh"
  23
  24 class Grace_engraver : public Engraver
  25 {
  26   void consider_change_grace_settings ();
  27 protected:
  28   void start_translation_timestep ();
  29   virtual void derived_mark () const;
  30   virtual void initialize ();
  31
  32   TRANSLATOR_DECLARATIONS (Grace_engraver);
  33   Moment last_moment_;
  34   SCM grace_settings_;
  35 public:
  36 };
  37
  38 Grace_engraver::Grace_engraver ()
  39 {
  40   grace_settings_ = SCM_EOL;
  41   last_moment_ = Moment (Rational (-1, 1));
  42 }
  43
  44 void
  45 Grace_engraver::initialize ()
  46 {
  47   consider_change_grace_settings ();
  48 }
  49
  50 void
  51 Grace_engraver::consider_change_grace_settings ()
  52 {
  53   Moment now = now_mom ();
  54   if (last_moment_.grace_part_ && !now.grace_part_)
  55     {
  56       for (SCM s = grace_settings_; scm_is_pair (s); s = scm_cdr (s))
  57         {
  58           SCM context = scm_caar (s);
  59           SCM entry = scm_cdar (s);
  60           SCM grob = scm_cadr (entry);
  61           SCM sym = scm_caddr (entry);
  62
  63           execute_pushpop_property (unsmob_context (context),
  64                                     grob, sym, SCM_UNDEFINED);
  65         }
  66
  67       grace_settings_ = SCM_EOL;
  68     }
  69   else if (!last_moment_.grace_part_ && now.grace_part_)
  70     {
  71       SCM settings = get_property ("graceSettings");
  72
  73       grace_settings_ = SCM_EOL;
  74       for (SCM s = settings; scm_is_pair (s); s = scm_cdr (s))
  75         {
  76           SCM entry = scm_car (s);
  77           SCM context_name = scm_car (entry);
  78           SCM grob = scm_cadr (entry);
  79           SCM sym = scm_caddr (entry);
  80           SCM val = scm_cadr (scm_cddr (entry));
  81
  82           Context *c = context ();
  83           while (c && !c->is_alias (context_name))
  84             c = c->get_parent_context ();
  85
  86           if (c)
  87             {
  88               execute_pushpop_property (c,
  89                                         grob, sym, val);
  90               grace_settings_
  91                 = scm_cons (scm_cons (c->self_scm (), entry), grace_settings_);
  92             }
  93           else
  94               programming_error ("cannot find context from graceSettings: "
  95                                  + ly_symbol2string (context_name));
  96         }
  97     }
  98
  99   last_moment_ = now_mom ();
 100 }
 101
 102 void
 103 Grace_engraver::derived_mark () const
 104 {
 105   scm_gc_mark (grace_settings_);
 106   Engraver::derived_mark ();
 107 }
 108
 109 void
 110 Grace_engraver::start_translation_timestep ()
 111 {
 112   consider_change_grace_settings ();
 113 }
 114
 115 #include "translator.icc"
 116
 117 ADD_TRANSLATOR (Grace_engraver,
 118                 /* doc */
 119                 "Set font size and other properties for grace notes.",
 120
 121                 /* create */
 122                 "",
 123
 124                 /* read */
 125                 "graceSettings ",
 126
 127                 /* write */
 128                 ""
 129                 );