/*
- stencil-expression.cc -- keep track of which expressions are valid
- stencil exps.
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 2005--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 2005--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stencil.hh"
+#include "protected-scm.hh"
-static SCM heads;
+static Protected_scm heads (SCM_EOL);
void register_stencil_head (SCM symbol)
{
- if (!heads)
- heads = scm_permanent_object (scm_cons (SCM_EOL, SCM_EOL));
-
scm_set_object_property_x (symbol, ly_symbol2scm ("stencil-head?"), SCM_BOOL_T);
- scm_set_cdr_x (heads, scm_cons (symbol, scm_cdr (heads)));
+ heads = scm_cons (symbol, heads);
}
bool
is_stencil_head (SCM symbol)
{
- return scm_object_property (symbol, ly_symbol2scm ("stencil-head?"))
- == SCM_BOOL_T;
+ return to_boolean (scm_object_property (symbol, ly_symbol2scm ("stencil-head?")));
}
SCM
all_stencil_heads ()
{
- return scm_cdr (heads);
+ return heads;
}
-