Include Paulo Moura's Logtalk OO LP system

git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@53 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

Logtalk/examples/lpa/NOTES

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+=================================================================
+Logtalk - Object oriented extension to Prolog
+Release 2.8.4
+
+Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
+=================================================================
+
+This example is an adaptation of a LPA Prolog++ example.
+
+To load all objects in this example consult the lpa.loader utility
+file.
+
+You will also need to consult the library/hierarchies.loader file.
+Note that the *.loader files are Prolog files.

Logtalk/examples/lpa/SCRIPT

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+=================================================================
+Logtalk - Object oriented extension to Prolog
+Release 2.8.4
+
+Copyright (c) 1998-2001 Paulo Moura.  All Rights Reserved.
+=================================================================
+
+
+| ?- fault::findall.
+
+Please answer all questions with yes or no.
+
+The starter turns but the engine doesnt fire?   no.
+The engine has difficulty starting?     yes.
+The engine cuts out shortly after starting?     yes.
+
+Location      : distributor
+Possible Fault: Worn distributor brushes
+
+No (more) explanations found.
+yes.

Logtalk/examples/lpa/cylinders.lgt

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+
+:- object(cylinders,
+	extends(engine)).
+
+
+:- end_object.

Logtalk/examples/lpa/distributor.lgt

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+
+:- object(distributor,
+	extends(sparking)).
+
+
+	fault(f1001, 'Condensation in the distributor cap').
+	fault(f1002, 'Faulty distributor arm').
+	fault(f1003, 'Worn distributor brushes').
+
+	symptom(s1001, 'The starter turns but the engine doesnt fire').
+	symptom(s1002, 'The engine has difficulty starting').
+	symptom(s1003, 'The engine cuts out shortly after starting').
+	symptom(s1004, 'The engine cuts out at speed').
+
+	effect(f1001, s1001).
+	effect(f1002, s1001).
+	effect(f1002, s1004).
+	effect(f1003, s1002).
+	effect(f1003, s1003).
+
+	contrary(s1002, s1001).
+	contrary(s1003, s1001).
+
+
+:- end_object.

Logtalk/examples/lpa/electrical.lgt

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+
+:- object(electrical,
+	extends(fault)).
+
+
+:- end_object.

Logtalk/examples/lpa/engine.lgt

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+
+:- object(engine,
+	extends(mechanical)).
+
+
+:- end_object.

Logtalk/examples/lpa/fault.lgt

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+
+:- object(fault,
+	imports(proto_hierarchy)).
+
+
+	:- info([
+		authors is 'Paulo Moura',
+		version is 1.0,
+		date is 2000/4/22,
+		comment is 'Expert system for automobile fault diagnosis.',
+		source is 'Example adopted from the LPA Prolog++ documentation.']).
+
+
+	:- public(findall/0).
+	:- mode(findall, one).
+
+	:- private(told_by_user_/2).
+	:- dynamic(told_by_user_/2).
+	:- mode(told_by_user_(?nonvar, ?nonvar), zero_or_more).
+
+	:- public(find/1).
+	:- mode(find(?nonvar), zero_or_more).
+
+	:- private(exhibited/1).
+	:- mode(exhibited(+nonvar), zero_or_one).
+
+	:- public(contrary/2).
+	:- mode(contrary(?nonvar, ?nonvar), zero_or_more).
+
+	:- public(fault/2).
+	:- mode(fault(?nonvar, ?nonvar), zero_or_more).
+
+	:- public(effect/2).
+	:- mode(effect(?nonvar, ?nonvar), zero_or_more).
+
+	:- public(symptom/2).
+	:- mode(symptom(?nonvar, ?nonvar), zero_or_more).
+
+
+	findall :-
+		retractall(told_by_user_(_, _)),
+		write('Please answer all questions with yes or no.'), nl, nl,
+		forall(
+ 			(::descendant(Where), Where::find(Description)),
+			(nl, write('Location      : '), write(Where), nl,
+			 write('Possible Fault: '), write(Description), nl)),
+		nl, write('No (more) explanations found.').
+
+
+	find(Description) :-
+		::fault(Fault, Description),
+		forall(::effect(Fault, Symptom), exhibited(Symptom)).
+
+
+	exhibited(Symptom) :-
+		told_by_user_(Symptom, Reply),
+		!,
+		Reply = yes.
+
+	exhibited(Symptom) :-
+		::symptom(Symptom, Description),
+		write(Description), write('? '),
+		read(Reply),
+		asserta(told_by_user_(Symptom, Reply)),
+		Reply = yes,
+		forall(
+			(::contrary(Symptom, Contrary);
+			 ::contrary(Contrary, Symptom)),
+			asserta(told_by_user_(Contrary, no))).
+
+
+:- end_object.

Logtalk/examples/lpa/fuel_system.lgt

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+
+:- object(fuel_system,
+	extends(fault)).
+
+
+:- end_object.

Logtalk/examples/lpa/lights.lgt

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+
+:- object(lights,
+	extends(electrical)).
+
+
+:- end_object.

Logtalk/examples/lpa/lpa.loader

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+
+:- initialization(
+	logtalk_load([
+		cylinders,
+		distributor,
+		electrical,
+		engine,
+		fault,
+		fuel_system,
+		lights,
+		mechanical,
+		plugs,
+		sparking,
+		starter_motor,
+		starting])).

Logtalk/examples/lpa/mechanical.lgt

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+
+:- object(mechanical,
+        extends(fault)).
+
+
+:- end_object.

Logtalk/examples/lpa/plugs.lgt

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+
+:- object(plugs,
+	extends(sparking)).
+
+
+:- end_object.

Logtalk/examples/lpa/sparking.lgt

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+
+:- object(sparking,
+	extends(starting)).
+
+
+:- end_object.

Logtalk/examples/lpa/starter_motor.lgt

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+
+:- object(starter_motor,
+	extends(starting)).
+
+
+:- end_object.

Logtalk/examples/lpa/starting.lgt

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+
+:- object(starting,
+	extends(electrical)).
+
+
+:- end_object.