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;;;======================================================
;;; Rock, Paper, & Scissors Game
;;;
;;; Plays a children's game in which
;;; Rock smashes scissors,
;;; Scissors cut paper, and
;;; Paper covers rock.
;;; Demonstrates a use for the random
;;; conflict resolution strategy.
;;;
;;; CLIPS Version 6.0 Example
;;;
;;; To execute, merely load, reset and run.
;;;======================================================
;;;****************
;;;* DEFFUNCTIONS *
;;;****************
(deffunction yes-or-no-p (?question)
(bind ?x bogus)
(while (and (neq ?x yes) (neq ?x y) (neq ?x no) (neq ?x n))
(format t "%s(Yes or No) " ?question)
(bind ?x (lowcase (sym-cat (read)))))
(if (or (eq ?x yes) (eq ?x y)) then TRUE else FALSE))
;;;*************
;;;* TEMPLATES *
;;;*************
(deftemplate win-totals
(slot human (type INTEGER) (default 0))
(slot computer (type INTEGER) (default 0))
(slot ties (type INTEGER) (default 0)))
(deftemplate results
(slot winner (type SYMBOL) (allowed-symbols rock paper scissors))
(slot loser (type SYMBOL) (allowed-symbols rock paper scissors))
(slot why (type STRING)))
;;;*****************
;;;* INITIAL STATE *
;;;*****************
(deffacts information
(results (winner rock) (loser scissors) (why "Rock smashes scissors"))
(results (winner scissors) (loser paper) (why "Scissors cut paper"))
(results (winner paper) (loser rock) (why "Paper covers rock"))
(valid-answer rock r rock)
(valid-answer paper p paper)
(valid-answer scissors s scissors))
;;;****************
;;;* STARTUP RULE *
;;;****************
(defrule startup
=>
(printout t "Lets play a game!" crlf crlf)
(printout t "You choose rock, paper, or scissors," crlf)
(printout t "and I'll do the same." crlf crlf)
(printout t "Rock smashes scissors!" crlf)
(printout t "Paper covers rock!" crlf)
(printout t "Scissors cut paper!" crlf crlf)
(set-strategy random)
(assert (win-totals))
(assert (get-human-move)))
;;;********************
;;;* HUMAN MOVE RULES *
;;;********************
(defrule get-human-move
(get-human-move)
=>
(printout t "Rock (R), Paper (P), or Scissors (S) ? ")
(assert (human-choice (read))))
(defrule good-human-move
?f1 <- (human-choice ?choice)
(valid-answer ?answer $? =(lowcase ?choice) $?)
?f2 <- (get-human-move)
=>
(retract ?f1 ?f2)
(assert (human-choice ?answer))
(assert (get-computer-move)))
(defrule bad-human-move
?f1 <- (human-choice ?choice)
(not (valid-answer ?answer $? =(lowcase ?choice) $?))
?f2 <- (get-human-move)
=>
(retract ?f1 ?f2)
(assert (get-human-move)))
;;;***********************
;;;* COMPUTER MOVE RULES *
;;;***********************
(defrule computer-picks-rock
?f1 <- (get-computer-move)
=>
(printout t "Computer chooses rock" crlf)
(retract ?f1)
(assert (computer-choice rock))
(assert (determine-results)))
(defrule computer-picks-paper
?f1 <- (get-computer-move)
=>
(printout t "Computer chooses paper" crlf)
(retract ?f1)
(assert (computer-choice paper))
(assert (determine-results)))
(defrule computer-picks-scissors
?f1 <- (get-computer-move)
=>
(printout t "Computer chooses scissors" crlf)
(retract ?f1)
(assert (computer-choice scissors))
(assert (determine-results)))
(defrule computer-wins
?f1 <- (determine-results)
?f2 <- (computer-choice ?cc)
?f3 <- (human-choice ?hc)
?w <- (win-totals (computer ?cw))
(results (winner ?cc) (loser ?hc) (why ?explanation))
=>
(retract ?f1 ?f2 ?f3)
(modify ?w (computer (+ ?cw 1)))
(format t "%s%n" ?explanation)
(printout t "Computer wins!" t)
(assert (determine-play-again)))
;;;***************************
;;;* WIN DETERMINATION RULES *
;;;***************************
(defrule human-wins
?f1 <- (determine-results)
?f2 <- (computer-choice ?cc)
?f3 <- (human-choice ?hc)
?w <- (win-totals (human ?hw))
(results (winner ?hc) (loser ?cc) (why ?explanation))
=>
(retract ?f1 ?f2 ?f3)
(modify ?w (human (+ ?hw 1)))
(format t "%s%n" ?explanation)
(printout t "You win!" t)
(assert (determine-play-again)))
(defrule tie
?f1 <- (determine-results)
?f2 <- (computer-choice ?cc)
?f3 <- (human-choice ?cc)
?w <- (win-totals (ties ?nt))
=>
(retract ?f1 ?f2 ?f3)
(modify ?w (ties (+ ?nt 1)))
(printout t "We tie." t)
(assert (determine-play-again)))
;;;*******************
;;;* PLAY AGAIN RULE *
;;;*******************
(defrule play-again
?f1 <- (determine-play-again)
(win-totals (computer ?ct) (human ?ht) (ties ?tt))
=>
(retract ?f1)
(assert (get-human-move))
(if (not (yes-or-no-p "Play again? "))
then
(printout t crlf "You won " ?ht " game(s)." t)
(printout t "Computer won " ?ct " game(s)." t)
(printout t "We tied " ?ct " game(s)." t t)
(halt)))
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