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tracer.pl
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tracer.pl
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:- use_module(utils).
:- use_module(parser).
:- use_module(tokenize).
:- dynamic fresh_vars/1.
:- dynamic verbose/0.
%%%%%%%%%%%%%%%%%%%%% tracer.pl %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
:- dynamic cl/3.
:- dynamic reading/3.
:- dynamic comment/1.
:- dynamic visible/1.
:- dynamic unsafe/1.
:- dynamic explanations/1.
:- dynamic filename/1.
:- dynamic query/1.
:- dynamic counter/1.
counter(0).
% empty set of preds: no renaming is required
pred_renaming([],Prob,Atom,[(Prob,Pred,N)],Atom) :- !,functor(Atom,Pred,N).
% a derived atom is renamed when it already belongs to Preds (duplication is not a problem)
pred_renaming(Preds,1,Atom,Preds,RAtom) :-
functor(Atom,Pred,N),
member((1,Pred,N),Preds),!,
counter(I),retractall(counter(I)),J is I+1,assertz(counter(J)),
Atom =.. [_|Args],
atom_concat(Pred,I,PredN),
RAtom =.. [PredN|Args].
% a probabilistic atom is renamed when the predicate belongs to Preds with a DIFFERENT probability
% (this is needed to avoid confusing the probabilities...)
pred_renaming(Preds,Prob,Atom,Preds,RAtom) :- %% no need to add the new one to Preds...
Prob < 1,
functor(Atom,Pred,N),
member((Prob2,Pred,N),Preds),
Prob \== Prob2,!,
counter(I),retractall(counter(I)),J is I+1,assertz(counter(J)),
Atom =.. [_|Args],
atom_concat(Pred,I,PredN),
RAtom =.. [PredN|Args].
% in the remaining cases, renaming is not needed...
% (note that we don't want to duplicate probabilistic predicates)
pred_renaming(Preds,Prob,Atom,[(Prob,Pred,N)|Preds],Atom) :-
functor(Atom,Pred,N).
load(File) :-
retractall(cl(_,_,_)),
retractall(reading(_,_,_)),
retractall(visible(_)),
retractall(unsafe(_)),
retractall(comment(_)),
retractall(query(_)),
retractall(filename(_)),
retractall(explanations(_)),
retractall(counter(_)),assertz(counter(0)),
read_problog_program(File,Program),
%print(Program),
file_base_name(File,FileNameExt),
string_concat(FileName,'.pl',FileNameExt),
assertz(filename(FileName)),
%nl,print(read_problog_program(File,Program)),nl,
replace_vars(Program,ProgramVars),
%nl,print(replace_vars(Program,ProgramVars)),nl,
assert_clauses(ProgramVars).
%query(Atom),
process_traces([],[]).
process_traces([T|R],[TT|RR]) :-
process_trace(T,TT),
process_traces(R,RR).
process_trace([],[]).
process_trace([call(N,A)|R],[call(N,A,S)|RT]) :-
(reading(A,String,Vars) -> format(string(S),String,Vars)
; term_string(A,S)),
process_trace(R,RT).
process_trace([not_call(N,A)|R],[not_call(N,A,S)|RT]) :-
(reading(not(A),String,Vars) -> format(string(S),String,Vars)
; term_string(A,AS), string_concat("not ",AS,S)),
process_trace(R,RT).
process_trace([failed_call(N,A)|R],[failed_call(N,A,S2)|RT]) :-
(reading(A,String,Vars) -> format(string(S),String,Vars)
; term_string(A,S)),
string_concat("(failed) ", S, S2),
process_trace(R,RT).
run(Q) :-
findall(Trace,eval(0,Q,Trace),Traces),
%print(Traces),nl,
process_traces(Traces,Traces2),
%print(Traces2),nl,
print_traces(Traces2),
write_traces(Traces2).
write_traces(Trace) :-
open('temp.txt',write,Stream),
set_prolog_IO(user_input,Stream,user_error),
print(Trace),
%print_traces(Trace),
close(Stream).
print_traces([]).
print_traces([Trace]) :-
!, print_trace(Trace).
print_traces([Trace|R]) :-
print_trace(Trace),
print(';'),nl,
print_traces(R).
print_trace([]).
print_trace([call(N,_A,S)|R]) :-
% tab(N*3),format("~p~n",[A]),
tab(N*3),format(S),nl,
print_trace(R).
print_trace([not_call(N,_A,S)|R]) :-
% tab(N*3),format("~p~n",[A]),
tab(N*3),format(S),nl,
print_trace(R).
print_trace([failed_call(N,_A,S)|R]) :-
% tab(N*3),format("~p~n",[A]),
tab(N*3),format(S),nl,
print_trace(R).
eval(_,[],[]).
eval(N,[ret|R],Trace) :-
M is N-1,
eval(M,R,Trace).
eval(N,[A|R],[call(N,A)|Trace]) :-
predicate_property(A,built_in),
\+ predicate_name(A,"not/1"),
!,
call(A),
eval(N,R,Trace).
eval(N,[not(A)|R],[not_call(N,A)|Trace]) :-
ground(A),
\+ cl(_,A,_Body),
eval(N,R,Trace).
eval(N,[not(A)|R],[not_call(N,A)|Trace]) :-
ground(A),
cl(_,A,Body),
M is N+1,
eval_not(M,Body,Trace1),
!,
eval(N,R,Trace2),
append(Trace1,Trace2,Trace).
eval(N,[A|R],[call(N,A)|Trace]) :-
cl(_,A,Body),
append(Body,[ret|R],RB),
M is N+1,
eval(M,RB,Trace).
eval_not(N,[ret|R],Trace) :-
M is N-1,
eval_not(M,R,Trace).
eval_not(N,[not(A)|_R],[call(N,A)|Trace]) :-
ground(A),
cl(_,A,Body),
M is N+1,
eval(M,Body,Trace).
eval_not(N,[not(A)|R],[not_call(N,A)|Trace]) :-
ground(A),
cl(_,A,Body),
M is N+1,
\+ eval(M,Body,_Trace),
eval_not(N,R,Trace).
eval_not(N,[A|_R],[failed_call(N,A)]) :-
\+ cl(_,A,_Body).
eval_not(N,[A|R],[call(N,A)|Trace]) :-
ground(A),
cl(_,A,Body),
M is N+1,
eval(M,Body,Trace1),!,
eval_not(N,R,Trace2),
append(Trace1,Trace2,Trace).
%% findall(SortedExplanation,
%% (cl(P,Atom,Body),
%% add_empty_ancestors(Body,BodyAn),
%% explanation([cl(P,Atom,[],[],BodyAn)],[],Explanation,[]),
%% sort(Explanation,SortedExplanation)
%% ),List),
%% %cl(Probability,Head,NotUnfoldable,Variants,Unfoldable)
%% %nl,print(Explanation),nl,
%% assertz(explanations(List)),
%% print_explanations(List),
%% format("Output files can be found in folder \"explanations\"."),!.
no_call([]).
no_call([res(_)|R]) :- no_call(R).
no_call([nounf(_)|R]) :- no_call(R).
remove_marks([],[]).
remove_marks([call(H,_)|R],[H|RR]) :- remove_marks(R,RR).
remove_marks([res(H)|R],[H|RR]) :- remove_marks(R,RR).
remove_marks([nounf(H)|R],[H|RR]) :- remove_marks(R,RR).
add_empty_ancestors([],[]).
add_empty_ancestors([H|R],[call(H,[])|RR]) :- add_empty_ancestors(R,RR).
add_ancestors([],_,[]).
add_ancestors([B|R],Ancestors,[call(B,Ancestors)|RA]) :-
add_ancestors(R,Ancestors,RA).
member_variant(H,[A|_]) :- variant(H,A),!.
member_variant(H,[_|R]) :- member_variant(H,R).
%% read_problog_program(file,program)
%% reads and processes the structure of the ProBlog program from a given file:
%% * extracts the list of tokens (Tokens) from the file
%% (with help from tokenizer.pl)
%% * removes unwanted tokens from Tokens (CleanTokens)
%% * generates the data structure CleanProg by parsing (phrase)
%% the list of tokens with the DCG specified in parser.pl
%% * performs a post-processing ...
read_problog_program(File,Program) :-
tokenize_file(File,Tokens,[cased(true),spaces(false),to(strings)]),
%lists:subtract(Tokens,[cntrl("\n")],CleanTokens),
%print(Tokens),nl,
phrase(program(Program),Tokens),
%nl,print(Program),nl,
%vars_ctrs(CleanCtrs,Vars),
%funs_ctrs(CleanCtrs,Funs),
%post(CleanCtrs,Vars,Funs,PostCtrs),
!.
assert_clauses([]).
assert_clauses([visible(Preds)|R]) :-
!,assert_visible_preds(Preds),
assert_clauses(R).
assert_clauses([unsafe(Preds)|R]) :-
!,assert_unsafe_preds(Preds),
assert_clauses(R).
assert_clauses([Cl|R]) :-
assertz(Cl),
assert_clauses(R).
assert_visible_preds([]).
assert_visible_preds([(Pred,N)|R]) :-
functor(Atom,Pred,N),
assertz(visible(Atom)),
assert_visible_preds(R).
assert_unsafe_preds([]).
assert_unsafe_preds([(Pred,N)|R]) :-
functor(Atom,Pred,N),
assertz(unsafe(Atom)),
assert_unsafe_preds(R).
replace_vars([],[]).
replace_vars([visible(L)|R],[visible(L)|RT]) :-
replace_vars(R,RT).
replace_vars([unsafe(L)|R],[unsafe(L)|RT]) :-
replace_vars(R,RT).
replace_vars([reading(Q,String,Vars)|R],[reading(Q3,String,V4)|RT]) :-
V =.. [foo|Vars],
rvars([Q,V],[Q2,V2],[],-1),
varnumbers([Q2,V2],[Q3,V3]),
V3 =.. [_|V4],
replace_vars(R,RT).
replace_vars([comment(C)|R],[comment(C)|RT]) :-
replace_vars(R,RT).
replace_vars([query(Q)|R],[query(Q3)|RT]) :-
rvars([Q],[Q2],[],-1),
varnumbers([Q2],[Q3]),
replace_vars(R,RT).
replace_vars([cl(Prob,Head,Body)|R],[cl(Prob,Head3,Body3)|RT]) :-
rvars([Head|Body],[Head2|Body2],[],-1),
varnumbers([Head2|Body2],[Head3|Body3]),
replace_vars(R,RT).
rvars([],[],_,_).
rvars([not(Atom)|R],[not(NAtom)|RR],VarList,N) :-
!,
Atom=..[Pred|Args],
rvars_args(Args,VarList,N,ArgsVars,NVarList,NN),
NAtom =.. [Pred|ArgsVars],
rvars(R,RR,NVarList,NN).
rvars([Atom|R],[NAtom|RR],VarList,N) :-
Atom=..[Pred|Args],
rvars_args(Args,VarList,N,ArgsVars,NVarList,NN),
NAtom =.. [Pred|ArgsVars],
rvars(R,RR,NVarList,NN).
rvars_args([],VarList,N,[],VarList,N).
rvars_args([var(X)|R],VarList,N,['$VAR'(Num)|RR],NVarList,NN) :-
member((X,Num),VarList),!,
rvars_args(R,VarList,N,RR,NVarList,NN).
rvars_args([var(X)|R],VarList,N,['$VAR'(M)|RR],NVarList,NN) :-
!, M is N+1,
rvars_args(R,[(X,M)|VarList],M,RR,NVarList,NN).
rvars_args([T|R],VarList,N,[T|RR],NVarList,NN) :-
rvars_args(R,VarList,N,RR,NVarList,NN).