+/*
+ This file is part of LilyPond, the GNU music typesetter.
+
+ Copyright (C) 2011 Mike Solomon <mike@apollinemike.com>
+
+
+ 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 "unpure-pure-container.hh"
+
+#include "grob.hh"
+
+static scm_t_bits unpure_pure_container_tag;
+
+bool
+is_unpure_pure_container (SCM s)
+{
+ return (SCM_NIMP (s) && SCM_CELL_TYPE (s) == unpure_pure_container_tag);
+}
+
+SCM
+unpure_pure_container_unpure_part (SCM smob)
+{
+ LY_ASSERT_TYPE (is_unpure_pure_container, smob, 1);
+ return (SCM) SCM_CELL_WORD_1 (smob);
+}
+
+SCM
+unpure_pure_container_pure_part (SCM smob)
+{
+ LY_ASSERT_TYPE (is_unpure_pure_container, smob, 1);
+ return (SCM) SCM_CELL_WORD_2 (smob);
+}
+
+LY_DEFINE (ly_unpure_pure_container_p, "ly:unpure-pure-container?",
+ 1, 0, 0, (SCM clos),
+ "Is @var{clos} an unpure pure container?")
+{
+ return scm_from_bool (is_unpure_pure_container (clos));
+}
+
+LY_DEFINE (ly_make_unpure_pure_container, "ly:make-unpure-pure-container",
+ 1, 1, 0, (SCM unpure, SCM pure),
+ "Make an unpure-pure container. @var{unpure} should be an unpure"
+ " expression, and @var{pure} should be a pure expression. If @var{pure}"
+ " is ommitted, the value of @var{unpure} will be used twice.")
+{
+ SCM z;
+
+ if (pure == SCM_UNDEFINED)
+ pure = unpure;
+
+ SCM_NEWSMOB2 (z, unpure_pure_container_tag, SCM_UNPACK (unpure), SCM_UNPACK (pure));
+ return z;
+}
+
+LY_DEFINE (ly_unpure_pure_container_unpure_part, "ly:unpure-pure-container-unpure-part",
+ 1, 0, 0, (SCM pc),
+ "Return the unpure part of @var{pc}.")
+{
+ LY_ASSERT_TYPE (is_unpure_pure_container, pc, 1);
+ return unpure_pure_container_unpure_part (pc);
+}
+
+LY_DEFINE (ly_unpure_pure_container_pure_part, "ly:unpure-pure-container-pure-part",
+ 1, 0, 0, (SCM pc),
+ "Return the pure part of @var{pc}.")
+{
+ LY_ASSERT_TYPE (is_unpure_pure_container, pc, 1);
+ return unpure_pure_container_pure_part (pc);
+}
+
+int
+print_unpure_pure_container (SCM s, SCM port, scm_print_state *)
+{
+ scm_puts ("#<unpure-pure-container ", port);
+ scm_display (unpure_pure_container_unpure_part (s), port);
+ scm_puts (" ", port);
+ scm_display (unpure_pure_container_pure_part (s), port);
+ scm_puts (" >", port);
+ return 1;
+}
+
+SCM
+pure_mark (SCM pure)
+{
+ scm_gc_mark (unpure_pure_container_unpure_part (pure));
+ scm_gc_mark (unpure_pure_container_pure_part (pure));
+ return pure;
+}
+
+void init_unpure_pure_container ()
+{
+ unpure_pure_container_tag = scm_make_smob_type ("unpure-pure-container", 0);
+ scm_set_smob_mark (unpure_pure_container_tag, pure_mark);
+ scm_set_smob_print (unpure_pure_container_tag, print_unpure_pure_container);
+};
+
+ADD_SCM_INIT_FUNC (unpure_pure_container, init_unpure_pure_container);
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