--- /dev/null
+/*
+ This file is part of LilyPond, the GNU music typesetter.
+
+ Copyright (C) 2014 David Kastrup <dak@gnu.org>
+
+ 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/>.
+*/
+
+// This module is concerned with managing grob-properties (more
+// exactly, grob property templates, as they are not yet part of a
+// grob) inside of context properties, in a context-hierarchical
+// manner, with one stack for properties and subproperties per
+// context.
+
+#ifndef GROB_PROPERTIES_HH
+#define GROB_PROPERTIES_HH
+
+#include "lily-proto.hh"
+
+// Several algorithms on Grob_properties need self-identifying
+// information to work properly, but there is no point in storing them
+// in the Grob_properties data structure itself. Instead we create a
+// reflective data structure containing all necessary information for
+// the algorithms processing Grob_properties.
+
+class Grob_property_info {
+ Context * const context_;
+ SCM const symbol_;
+ Grob_properties *props_;
+public:
+ Grob_property_info (Context *context, SCM symbol, Grob_properties *props = 0)
+ : context_ (context), symbol_ (symbol), props_ (props)
+ { }
+ operator bool () { return props_; }
+ Grob_property_info find ();
+ bool check ();
+ bool create ();
+ SCM updated ();
+ void push (SCM path, SCM value);
+ void pop (SCM path);
+ void pushpop (SCM path, SCM value)
+ {
+ if (SCM_UNBNDP (value))
+ return pop (path);
+ push (path, value);
+ }
+};
+#endif