File: rules.lisp

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;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name:          rules.lisp
;;;; Purpose:       Slot and Class rules
;;;; Programmer:    Kevin M. Rosenberg
;;;; Date Started:  Apr 2000
;;;;
;;;; $Id: rules.lisp 8099 2003-11-05 22:55:12Z kevin $
;;;;
;;;; This file is Copyright (c) 2000-2003 by Kevin M. Rosenberg
;;;; *************************************************************************
 
(in-package #:hyperobject)

;;; Slot accessor and class rules

(defclass rule ()
  ((name :initarg :name :initform nil :accessor name)
   (dependants :initarg :dependants :initform nil :accessor dependants)
   (volatile :initarg :volatile :initform nil :accessor volatile)
   (access-slots :initarg :access-slots :initform nil :accessor access-slots)
   (source-code :initarg :source-code :initform nil :accessor source-code)
   (func :initform nil :initarg :func :accessor func)))

(defun compile-rule (source-code dependants volatile cl)
  (declare (ignore cl))
  (let ((access (appendnew dependants volatile)))
    (compile nil
	     (eval
	      `(lambda (obj)
		 (when (every #'(lambda (x) (slot-boundp obj x))
			      (quote ,dependants))
		   (with-slots ,access obj
		     ,@source-code)))))))
  
(defun finalize-rules (cl)
  (setf (rules cl)
    (loop for rule in (direct-rules cl)
	collect 
	  (destructuring-bind (name (&key dependants volatile) &rest source-code)
	      rule
	    (setf dependants (mklist dependants)
		  volatile (mklist volatile))
	    (make-instance 'rule :name name :dependants dependants
			   :volatile volatile :source-code source-code
			   :access-slots (appendnew dependants volatile)
			   :func (compile-rule
				  source-code dependants volatile cl))))))


(defun fire-class-rules (cl obj slot)
  "Fire all class rules. Called after a slot is modified."
  (let ((name (slot-definition-name slot)))
    (dolist (rule (rules cl))
      (when (find name (dependants rule))
	(cmsg-c :debug "firing rule: ~W" (source-code rule))
	(funcall (func rule) obj)))))


#+ho-svuc
(defmethod (setf slot-value-using-class) :around
    (new-value (cl hyperobject-class) obj (slot hyperobject-esd))

  #+ignore
  (cmsg-c :verbose "Setf slot value: class: ~s, obj: ~s, slot: ~s, value: ~s" cl (class-of obj) slot new-value)
  
  (let ((func (esd-value-constraint slot)))
    (cond
      ((and func (not (funcall func new-value)))
       (warn "Rejected change to value of slot ~a of object ~a"
	     (slot-definition-name slot) obj)
       (slot-value obj (slot-definition-name slot)))
      (t
       (prog1
	   (call-next-method)
	 (when (direct-rules cl)
	   (fire-class-rules cl obj slot)))))))