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print equations between variables (#228, #252)

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This commit is contained in:
Mark Thom
2019-12-06 10:30:16 -04:00
parent 018b076835
commit 90e1c990e5
1 changed files with 8 additions and 1 deletions
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9
src/prolog/toplevel.pl
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@@ -144,13 +144,20 @@
).
'$gather_query_vars'([], []).
'$is_a_different_variable'([Var = Binding | Pairs], Value) :-
( Value == Binding, !
; '$is_a_different_variable'(Pairs, Value)
).
'$gather_goals'([], VarList, Goals) :-
'$get_attr_var_queue_beyond'(0, AttrVars),
'$gather_query_vars'(VarList, QueryVars),
'$call_attribute_goals'(QueryVars, AttrVars),
'$fetch_attribute_goals'(Goals).
'$gather_goals'([Var = Value | Pairs], VarList, Goals) :-
( nonvar(Value) ->
( ( nonvar(Value)
; '$is_a_different_variable'(Pairs, Value)
) ->
Goals = [Var = Value | Goals0],
'$gather_goals'(Pairs, VarList, Goals0)
; '$gather_goals'(Pairs, VarList, Goals)