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use select/3 in gather_equations for detecting whether variables are distinct.

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This commit is contained in:
Mark Thom
2020-05-03 20:31:12 -06:00
parent e2a3db1b82
commit e5903d8d6e
2 changed files with 17 additions and 15 deletions
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15
src/prolog/toplevel.pl
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@@ -235,7 +235,7 @@ write_eqs_and_read_input(B, VarList) :-
append([Vars0, AttrVars, AttrGoalVars], Vars),
charsio:extend_var_list(Vars, VarList, NewVarList, fabricated),
'$get_b_value'(B0),
gather_equations(NewVarList, Goals, AttrGoals),
gather_equations(NewVarList, NewVarList, Goals, AttrGoals),
( bb_get('$first_answer', true) ->
write(' '),
bb_put('$first_answer', false)
@@ -294,17 +294,18 @@ gather_query_vars([], []).
is_a_different_variable([_ = Binding | Pairs], Value) :-
( Value == Binding, !
; is_a_different_variable(Pairs, Value)
; is_a_different_variable(Pairs, Var)
).
gather_equations([], Goals, Goals).
gather_equations([Var = Value | Pairs], Goals, Goals1) :-
gather_equations([], MasterList, Goals, Goals).
gather_equations([Var = Value | Pairs], MasterList, Goals, Goals1) :-
select((Var = _), MasterList, MasterPairs),
( ( nonvar(Value)
; is_a_different_variable(Pairs, Value)
; is_a_different_variable(MasterPairs, Value)
) ->
Goals = [Var = Value | Goals0],
gather_equations(Pairs, Goals0, Goals1)
; gather_equations(Pairs, Goals, Goals1)
gather_equations(Pairs, MasterList, Goals0, Goals1)
; gather_equations(Pairs, MasterList, Goals, Goals1)
).
print_exception(E) :-