;;; ****************************************************************
 ;;; VPS2 -- Interpreter for OPS5 ***********************************
 ;;; ****************************************************************
 ;;;
 ;;; Ops5 is a programming language for production systems.
 ;;;
 ;;; This Common Lisp version of OPS5 is in the public domain.  It is based
 ;;; in part on based on a Franz Lisp implementation done by Charles L. Forgy
 ;;; at Carnegie-Mellon University, which was placed in the public domain by
 ;;; the author in accordance with CMU policies.  Ported to Common Lisp by 
 ;;; George Wood and Jim Kowalski. CMU Common Lisp modifications by
 ;;; Dario Guise, Skef Wholey, Michael Parzen, and Dan Kuokka. 
 ;;; Modified to work in CLtL1, CLtL2 and X3J13 compatible lisps by 
 ;;; Mark Kantrowitz on 14-OCT-92. The auto.ops and reactor.ops demo files

 ;;; were provided by Michael Mauldin.  In year 2013, ported to modern Common
 ;;; Lisp implementations and added support for quicklisp by Xiaofeng Yang.

 ;;; 
 ;;; This code is made available is, and without warranty of any kind by the
 ;;; authors or by Carnegie-Mellon University.
 ;;;

 ;;; This code has been tested in Clozure CL v1.9, SBCL v1.0.57, CLISP v2.49,

 ;;; ECL v12.12.1, ABCL v1.1.1, Lispworks v6.1, MKCL v1.1.3, and Allegro CL v8.2.

 ;;;
 ;;; Source code:
 ;;;    ops.lisp, ops-globals.lisp, ops-backup.lisp, ops-compile.lisp, 
 ;;;    ops-init.lisp, ops-io.lisp, ops-main.lisp, ops-match.lisp, 
 ;;;    ops-rhs.lisp, ops-util.lisp
 ;;;
 ;;; Demo Files: 
 ;;;    ops-demo-mab.lisp and ops-demo-ttt.lisp
 ;;;    auto.ops and reactor.ops
 ;;;
 ;;; Documentation for OPS may be found in the OPS5 User's Manual, July 1981,
 ;;; by Forgy, CMU CSD.
 ;;;
 ;;; This version of OPS5 was obtained by anonymous ftp from 
 ;;;    ftp.cs.cmu.edu:/user/ai/areas/expert/systems/ops5/ops5_cl.tgz
 
 ;;; ********************************
 ;;; Usage **************************
 ;;; ********************************
 ;;; 
 ;;; To use:

 ;;;    1. Clone this project and put into the local-projects directory of quicklisp (e.g. "~/quicklisp/local-projects").
 ;;;    2. Use quicklisp to load this project:
 ;;;          (ql:quickload "ops5")

 ;;; Now you can load your OPS5 code or start typing in productions.
 ;;; If you want to load in a new set of productions, call (reset-ops)
 ;;; between rule sets. For a nice REP Loop, run (ops).
 ;;;
 ;;; Demos:
 ;;;
 ;;; There are two demos
 ;;;    interactive tic-tac-toe 
 ;;;    the monkey and banana problem
 ;;; To run the former, just load it and call (run). For the latter,
 ;;; load it, enter (make start 1) and then call (run).
 
 ;;; ********************************
 ;;; Known Bugs *********************
 ;;; ********************************
 ;;;
 ;;; Loading new rule-sets clobbers the state of the interpreter. To use
 ;;; a new rule-set, exit lisp and restart OPS.
 ;;;
 ;;; Although this implementation has been put into its own package, only
 ;;; a few interfaces have been exported. You must run in the OPS package.
 
 ;;; ********************************
 ;;; Sample Run *********************
 ;;; ********************************

 CL-USER> (ql:quickload "ops5")
 To load "ops5":
   Load 1 ASDF system:
     ops5
 ; Loading "ops5"
 .........................
 ("ops5")
 CL-USER> (in-package "OPS")
 #<Package "OPS">
 OPS> (load (merge-pathnames "../demo/auto.ops" *ops-code-directory*))
 Resetting OPS5 interpreter: 
              
    deleting productions, working memory, etc.
 Common Lisp OPS5 interpreter, version 19-OCT-92.

 ******************

 #P"/home/nakrakiiya/quicklisp/local-projects/ops5/demo/auto.ops"
 OPS> (make ready)

 NIL

 OPS> (run)

 
 
 Automobile Diagnosis 
 
 
 Is this true: key is off [no]  y
 
 Concluding you must turn the key to start the car 
 *End of diagnosis* 
 
 
 Is this true: key is off [no]  
 
 Is this true: engine is turning [no]  yes
 
 Concluding problem is in fuel or ignition system 
 
 Is this true: headlights are dim or dead [no]  q
 
 end -- explicit halt
  18 productions (108 // 200 nodes)
  19 firings (42 rhs actions)
   5 mean working memory size (8 maximum)
   4 mean conflict set size (7 maximum)
  10 mean token memory size (17 maximum)
 NIL

 OPS> 

 ;;; *EOF*