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2
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1 :- multifile tclause/2.
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2
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3 % Basic Composite
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4 % fact is not allowed. use a:-true form.
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5 % commented out one is defined internally for efficiency
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6 % @(A) :- more,next(A).
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7 % #(A) :- A,next(#(A)).
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8 % [](A) :- A,next([](A)).
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9 % (A && B) :- (A,more) & B.
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10 % (A &@ B) :- A & @B.
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11 % keep(A) :- next(keep(A)),ifMore(A).
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12 % fin(A) :- next(fin(A)),ifEmpty(A).
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13 % gets(A,B) :- keep(@A = B).
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14 % (A<-B) :- A=B,stable(C),fin(A=C).
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15 (A<-B) :- C<--B,fin(A=C).
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16 skip :- @empty.
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17 <>(A) :- true & A.
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18 halt(A) :- A,!,empty.
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19 halt(A) :- @(halt(A)).
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20 stable(A) :- gets(A,A).
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21 % Framing
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22 % A <= B :- more, <>(A:=B).
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23 A // B :- process(A),process(B).
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24 frame(A,B) :- frame(A), B.
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25 frames([H|T],B) :- frame(H),frames(T,B).
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26 frames([],B) :- B.
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27 readonlys([H|T],B) :- readonly(H),readonlys(T,B).
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28 readonlys([],B) :- B.
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29 % A:=B :- forall_parent(flag(A,assign)),@A=B.
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30 % readonly(A) :- flag(A,stay).
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31 % Closures
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32 *(_) :- empty.
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33 *(A) :- more,A & *(A).
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34 % These are very slow in interpreter
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35 while(A,B) :- (A,!,more,B) & while(A,B).
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36 while(_,_) :- empty.
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37 (if A then B else _) :- A,!,B.
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38 (if _ then _ else C) :- C.
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39 (_ else _) :- fail.
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40 (if A then B) :- A,!,B.
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41 (if _ then _) :- true.
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42 % end
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