--- /dev/null
+;;; -*-lisp-*-
+;;;
+;;; Class finalization protocol
+;;;
+;;; (c) 2009 Straylight/Edgeware
+;;;
+
+;;;----- Licensing notice ---------------------------------------------------
+;;;
+;;; This file is part of the Sensble Object Design, an object system for C.
+;;;
+;;; SOD 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 2 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; SOD 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 SOD; if not, write to the Free Software Foundation,
+;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+(cl:in-package #:sod)
+
+;;;--------------------------------------------------------------------------
+;;; Protocol definition.
+
+(defgeneric compute-cpl (class)
+ (:documentation
+ "Returns the class precedence list for CLASS."))
+
+(defgeneric compute-chains (class)
+ (:documentation
+ "Compute the layout chains for CLASS.
+
+ Returns the following three values.
+
+ * the head of the class's primary chain;
+
+ * the class's primary chain as a list, most- to least-specific; and
+
+ * the complete collection of chains, as a list of lists, each most- to
+ least-specific, with the primary chain first.
+
+ These values will be stored in the CHAIN-HEAD, CHAIN and CHAINS slots.
+
+ If the chains are ill-formed (i.e., not distinct) then an error is
+ signalled."))
+
+(defgeneric check-sod-class (class)
+ (:documentation
+ "Check the CLASS for validity.
+
+ This is done as part of class finalization. The checks performed are as
+ follows.
+
+ * The class name and nickname, and the names of messages, obey the
+ rules (see VALID-NAME-P).
+
+ * The messages and slots have distinct names.
+
+ * The classes in the class-precedence-list have distinct nicknames.
+
+ * The chain-link is actually a proper (though not necessarily direct)
+ superclass.
+
+ * The chosen metaclass is actually a subclass of all of the
+ superclasses' metaclasses.
+
+ Returns true if all is well; false (and signals errors) if anything was
+ wrong."))
+
+(defgeneric finalize-sod-class (class)
+ (:documentation
+ "Computes all of the gory details about a class.
+
+ Once one has stopped inserting methods and slots and so on into a class,
+ one needs to finalize it to determine the layout structure and the class
+ precedence list and so on. More precisely that gets done is this:
+
+ * Related classes (i.e., direct superclasses and the metaclass) are
+ finalized if they haven't been already.
+
+ * If you've been naughty and failed to store a list of slots or
+ whatever, then an empty list is inserted.
+
+ * The class precedence list is computed and stored.
+
+ * The class is checked for compiance with the well-formedness rules.
+
+ * The layout chains are computed."))
+
+;;;----- That's all, folks --------------------------------------------------