lily/stencil-expression.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--2011 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 "stencil.hh"
  21
  22 static SCM heads;
  23
  24 void register_stencil_head (SCM symbol)
  25 {
  26   if (!heads)
  27     heads = scm_permanent_object (scm_cons (SCM_EOL, SCM_EOL));
  28
  29   scm_set_object_property_x (symbol, ly_symbol2scm ("stencil-head?"), SCM_BOOL_T);
  30   scm_set_cdr_x (heads,  scm_cons (symbol, scm_cdr (heads)));
  31 }
  32
  33 bool
  34 is_stencil_head (SCM symbol)
  35 {
  36   return scm_object_property (symbol, ly_symbol2scm ("stencil-head?"))
  37     == SCM_BOOL_T;
  38 }
  39
  40 SCM
  41 all_stencil_heads ()
  42 {
  43   return scm_cdr (heads);
  44 }
  45