% From the book
% PROLOG PROGRAMMING IN DEPTH
% by Michael A. Covington, Donald Nute, and Andre Vellino
% (Prentice Hall, 1997).
% Copyright 1997 Prentice-Hall, Inc.
% For educational use only
 
% File CAR.PL
% Simple automotive expert system
 
 
 
%
% Main control procedures
%
 %  write('This program diagnoses why a car won''t start.'),nl,
 %  write('Answer all questions with Y for yes or N for no.'),nl,
 
start :-
   clear_stored_answers,
   try_all_possibilities.
 
try_all_possibilities :-     % Backtrack through all possibilities...
   defect_may_be(D),
   explain(D),
   fail.
 
try_all_possibilities.       % ...then succeed with no further action.
 
 
%
% Diagnostic knowledge base
%   (conditions under which to give each diagnosis)
%
 
defect_may_be(drained_battery) :-
   user_says(starter_was_ok,yes),
   user_says(starter_is_ok,no).
 
defect_may_be(wrong_gear) :-
   user_says(starter_was_ok,no).
 
defect_may_be(starting_system) :-
   user_says(starter_was_ok,no).
 
defect_may_be(fuel_system) :-
   user_says(starter_was_ok,yes),
   user_says(fuel_is_ok,no).
 
defect_may_be(ignition_system) :-
   user_says(starter_was_ok,yes),
   user_says(fuel_is_ok,yes).
 
 
%
% Case knowledge base
%   (information supplied by the user during the consultation)
%
 
:- dynamic(stored_answer/2).
 
   % (Clauses get added as user answers questions.)
 
 
%
% Procedure to get rid of the stored answers
% without abolishing the dynamic declaration
%
 
clear_stored_answers :- retract(stored_answer(_,_)).
clear_stored_answers.
 
 
%
% Procedure to retrieve the user's answer to each question when needed,
% or ask the question if it has not already been asked
%
 
user_says(Q,A) :- stored_answer(Q,A).
 
user_says(Q,A) :- \+ stored_answer(Q,_),
                  ask_question(Q,Response),
		  		  asserta(stored_answer(Q,Response)),
                  Response = A.
 
% Texts of the questions
%
ask_question(starter_was_ok,Res) :-
	show_yes_no_dialog('When you first started trying to start the car\n did the starter crank the engine normally?',Res).
 
ask_question(starter_was_ok,Res) :-
	show_yes_no_dialog('Does the starter crank the engine normally now? ',Res).
 
ask_question(starter_was_ok,Res) :-
	show_yes_no_dialog('Look in the carburetor.  Can you see or smell gasoline?',Res).
 
 
show_yes_no_dialog(Tekst,Response) :- 
		jpl_call('dialog.MessageDialogs', 'showYesNoDialog', [Tekst], Response).
 
 
show_explain_dialog(Tekst) :-
		jpl_call('dialog.MessageDialogs', 'showInformation', [Tekst],_).
 
 
%
%  Explanations for the various diagnoses
%
 
explain(wrong_gear) :-
	show_explain_dialog('Check that the gearshift is set to Park or Neutral.Try jiggling the gearshift lever.').
 
explain(starting_system) :-
	show_explain_dialog('Check for a defective battery, voltage regulator, or alternator; if any of these is the problem, charging the battery or jump-starting may get the car going temporarily.Or the starter itself may be defective').
 
 
explain(drained_battery) :-
	show_explain_dialog('Your attempts to start the car have run down the battery.Recharging or jump-starting will be necessary.But there is probably nothing wrong with the battery itself.').
 
 
explain(fuel_system) :-
	 show_explain_dialog('Check whether there is fuel in the tank.If so, check for a clogged fuel line or filter or a defective fuel pump.').
 
explain(ignition_system) :-
	show_explain_dialog('Check the spark plugs, cables, distributor,coil, and other parts of the ignition system.If any of these are visibly defective or long overdue for replacement, replace them; if this does not solve the problem, consult a mechanic.').
pl/miw/miw08_ruleruntimeg_2/pliki/carjpl2.txt · ostatnio zmienione: 2019/06/27 15:50 (edycja zewnętrzna)
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