From: LeonardoBizzoni <leo2002714@gmail.com>
Date: Sun, 24 Dec 2023 10:20:25 +0000 (+0100)
Subject: La Mirko-alternativa
X-Git-Url: http://git.leonardobizzoni.com/?a=commitdiff_plain;h=cb2c01e841616250ef1dc4185009e4d4271fea2a;p=ObjectOriented-Prolog-Lisp

La Mirko-alternativa
---

diff --git a/Prolog/README.org b/Prolog/README.org
index b23a6f2..8b707bf 100644
--- a/Prolog/README.org
+++ b/Prolog/README.org
@@ -237,8 +237,10 @@ add_part(ClassName, [method(Name, ArgList, Body) | OtherParts]) :-
 
     asserta(is_member(method(Name, ArgList, Body), ClassName)),
 
-    Fn =.. [Name, Instance | ArgList],
-    asserta(Fn :- (call_method(Instance, ClassName, Body), !)),
+    Head =.. [Name, InstanceName | ArgList],
+    !,
+    edit_body(InstanceName, Body, NewBody),
+    asserta(Head :- (call_method(InstanceName, ClassName, NewBody))),
 
     add_part(ClassName, OtherParts).
 #+end_src
@@ -286,29 +288,43 @@ check_fields(InstanceName, [=(Field, Value) | Other]) :-
     check_fields(InstanceName, Other).
 #+end_src
 
-** define_this
-#+begin_src prolog :tangle oop.pl
-define_this(Instance) :-
-    \+ is_list(Instance),
-    !,
-    findall(Key = Value, field(Instance, Key, Value), List),
-    define_this(List).
-
-define_this([]) :- !.
-define_this([=(Key, Value) | Other]) :-
-    asserta(field(this, Key, Value)),
-    define_this(Other).
-#+end_src
-
 ** call_method
 #+begin_src prolog :tangle oop.pl
 call_method(Instance, ClassName, Body) :-
     is_instance(Instance, ClassName),
     asserta(is_instance(this, ClassName)),
-    define_this(Instance),
     call_cleanup(call(Body), (
-		     retractall(is_instance(this, ClassName)),
-		     retractall(field(this, _, _)))).
+		     retractall(is_instance(this, ClassName)))).
+#+end_src
+
+** edit_body
+#+begin_src prolog
+edit_body(InstanceName, OldBody, NewBody) :-
+    conjunction_to_list(OldBody, BodyList),
+    replace(field(this, Name, Value), field(InstanceName, Name, Value), BodyList, Result),
+    list_to_conjunction(Result, NewBody).
+    #+end_src
+
+** conjunction_to_list
+#+begin_src prolog
+conjunction_to_list(Body, [P | Ps]) :-
+    Body = (P, Conjuncts),
+    !,
+    conjunction_to_list(Conjuncts, Ps).
+conjunction_to_list(Predicate, [Predicate]) :- !.
+#+end_src
+
+** list_to_conjunction
+#+begin_src prolog
+list_to_conjunction([], true).
+list_to_conjunction([P|Ps], (P, Conjuncts)) :- list_to_conjunction(Ps, Conjuncts).
+#+end_src
+
+** replace
+#+begin_src prolog
+replace(_, _, [], []) :- !.
+replace(Old, New, [Old | L1], [New | L2]) :- !, replace(Old, New, L1, L2).
+replace(Old, New, [E | L1], [E | L2]) :- E \= Old, !, replace(Old, New, L1, L2).
 #+end_src
 
 ** check_value_type
diff --git a/Prolog/oop.pl b/Prolog/oop.pl
index 3ec30c9..d2f3ba4 100644
--- a/Prolog/oop.pl
+++ b/Prolog/oop.pl
@@ -95,7 +95,7 @@ fieldx(Instance, [FieldName], Res) :-
     !.
 fieldx(Instance, [FieldName | Others], Res) :-
     is_instance(Instance),
-    field(Instance, FieldName, Value),
+    field(Instance, FieldName, _Value),
     fieldx(Instance, Others, Res).
 
 :- dynamic is_class/1.
@@ -155,8 +155,10 @@ add_part(ClassName, [method(Name, ArgList, Body) | OtherParts]) :-
 
     asserta(is_member(method(Name, ArgList, Body), ClassName)),
 
-    Fn =.. [Name, Instance | ArgList],
-    asserta(Fn :- (call_method(Instance, ClassName, Body), !)),
+    Head =.. [Name, InstanceName | ArgList],
+    !,
+    edit_body(InstanceName, Body, NewBody),
+    asserta(Head :- (call_method(InstanceName, ClassName, NewBody))),
 
     add_part(ClassName, OtherParts).
 
@@ -194,24 +196,30 @@ check_fields(InstanceName, [=(Field, Value) | Other]) :-
     field(InstanceName, Field, Value),
     check_fields(InstanceName, Other).
 
-define_this(Instance) :-
-    \+ is_list(Instance),
-    !,
-    findall(Key = Value, field(Instance, Key, Value), List),
-    define_this(List).
-
-define_this([]) :- !.
-define_this([=(Key, Value) | Other]) :-
-    asserta(field(this, Key, Value)),
-    define_this(Other).
-
 call_method(Instance, ClassName, Body) :-
     is_instance(Instance, ClassName),
     asserta(is_instance(this, ClassName)),
-    define_this(Instance),
     call_cleanup(call(Body), (
-		     retractall(is_instance(this, ClassName)),
-		     retractall(field(this, _, _)))).
+		     retractall(is_instance(this, ClassName)))).
+
+edit_body(InstanceName, OldBody, NewBody) :-
+    conjunction_to_list(OldBody, BodyList),
+    replace(field(this, Name, Value), field(InstanceName, Name, Value), BodyList, Result),
+    list_to_conjunction(Result, NewBody).
+
+conjunction_to_list(Body, [P | Ps]) :-
+    Body = (P, Conjuncts),
+    !,
+    conjunction_to_list(Conjuncts, Ps).
+conjunction_to_list(Predicate, [Predicate]) :- !.
+
+list_to_conjunction([], true).
+list_to_conjunction([P|Ps], (P, Conjuncts)) :- list_to_conjunction(Ps, Conjuncts).
+
+replace(_, _, [], []) :- !.
+replace(Old, New, [Old | L1], [New | L2]) :- !, replace(Old, New, L1, L2).
+replace(Old, New, [E | L1], [E | L2]) :- E \= Old, !, replace(Old, New, L1, L2).
+
 
 check_value_type(nil, _X) :- !.
 check_value_type(var, X) :- var(X), !.