Imported Upstream version 2.16.0

[lilypond.git] / lily / undead.cc

diff --git a/lily/undead.cc b/lily/undead.cc
new file mode 100644 (file)
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+++ b/lily/undead.cc
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+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2012 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 "smobs.hh"
+#include "ly-smobs.icc"
+
+class Undead
+{
+  DECLARE_SIMPLE_SMOBS (Undead);
+  SCM object_;
+public:
+  SCM object () { return object_; }
+  Undead (SCM object = SCM_UNDEFINED) : object_ (object) { };
+};
+
+SCM
+Undead::mark_smob (SCM s)
+{
+  bool saved = parsed_objects_should_be_dead;
+  parsed_objects_should_be_dead = false;
+  scm_gc_mark (Undead::unsmob (s)->object ());
+  parsed_objects_should_be_dead = saved;
+  return SCM_UNDEFINED;
+}
+
+int
+Undead::print_smob (SCM undead,
+                    SCM port,
+                    scm_print_state *)
+{
+  scm_puts ("#<Undead ", port);
+  scm_display (Undead::unsmob (undead)->object (), port);
+  scm_puts (" >", port);
+  return 1;
+}
+
+IMPLEMENT_SIMPLE_SMOBS (Undead);
+IMPLEMENT_DEFAULT_EQUAL_P (Undead);
+IMPLEMENT_TYPE_P (Undead, "ly:undead?")
+
+LY_DEFINE (ly_make_undead, "ly:make-undead",
+           1, 0, 0, (SCM object),
+           "This packages @var{object} in a manner that keeps it from"
+           " triggering \"Parsed object should be dead\" messages.")
+{
+  Undead undead (object);
+  return undead.smobbed_copy ();
+}
+
+LY_DEFINE (ly_get_undead, "ly:get-undead",
+           1, 0, 0, (SCM undead),
+           "Get back object from @var{undead}.")
+{
+  LY_ASSERT_SMOB (Undead, undead, 1);
+  return Undead::unsmob (undead)->object ();
+}
+
+// '
+// These are not protected since the means of protecting them would be
+// problematic to trigger during the mark pass where the array element
+// references get set.  However, they get set only when in the mark
+// pass when checking for parsed elements that should be dead, and we
+// query and clear them immediately afterwards.  So there should be no
+// way in which the references would have become unprotected in the
+// mean time.
+
+vector<parsed_dead *> parsed_dead::elements;
+
+SCM
+parsed_dead::readout ()
+{
+  SCM result = SCM_EOL;
+  for (vsize i = 0; i < elements.size (); i++)
+    {
+      SCM elt = elements[i]->readout_one ();
+      if (!SCM_UNBNDP (elt))
+        result = scm_cons (elt, result);
+    }
+  return result;
+}
+
+LY_DEFINE (ly_parsed_undead_list_x, "ly:parsed-undead-list!",
+           0, 0, 0, (),
+           "Return the list of objects that have been found live"
+           " that should have been dead, and clear that list.")
+{
+  return parsed_dead::readout ();
+}