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ADDED: New Prolog flag, answer_write_options.

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This lets us specify additional write options used by the top level
for writing answers.
This commit is contained in:
Markus Triska
2023-09-03 09:33:16 +02:00
parent 66f6399b8a
commit c934e06171
2 changed files with 31 additions and 8 deletions
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17
src/toplevel.pl
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@@ -235,8 +235,12 @@ double_quotes_option(DQ) :-
; DQ = false
).
answer_write_options(Os) :-
current_prolog_flag(answer_write_options, Os).
write_goal(G, VarList, MaxDepth) :-
double_quotes_option(DQ),
answer_write_options(Os),
( G = (Var = Value) ->
( var(Value) ->
select((Var = _), VarList, NewVarList)
@@ -246,17 +250,18 @@ write_goal(G, VarList, MaxDepth) :-
write(' = '),
( needs_bracketing(Value, =) ->
write('('),
write_term(Value, [quoted(true), variable_names(NewVarList), max_depth(MaxDepth), double_quotes(DQ)]),
write_term(Value, [quoted(true), variable_names(NewVarList), max_depth(MaxDepth), double_quotes(DQ)|Os]),
write(')')
; write_term(Value, [quoted(true), variable_names(NewVarList), max_depth(MaxDepth), double_quotes(DQ)])
; write_term(Value, [quoted(true), variable_names(NewVarList), max_depth(MaxDepth), double_quotes(DQ)|Os])
)
; G == [] ->
write('true')
; write_term(G, [quoted(true), variable_names(VarList), max_depth(MaxDepth), double_quotes(DQ)])
; write_term(G, [quoted(true), variable_names(VarList), max_depth(MaxDepth), double_quotes(DQ)|Os])
).
write_last_goal(G, VarList, MaxDepth) :-
double_quotes_option(DQ),
answer_write_options(Os),
( G = (Var = Value) ->
( var(Value) ->
select((Var = _), VarList, NewVarList)
@@ -266,9 +271,9 @@ write_last_goal(G, VarList, MaxDepth) :-
write(' = '),
( needs_bracketing(Value, =) ->
write('('),
write_term(Value, [quoted(true), variable_names(NewVarList), max_depth(MaxDepth), double_quotes(DQ)]),
write_term(Value, [quoted(true), variable_names(NewVarList), max_depth(MaxDepth), double_quotes(DQ)|Os]),
write(')')
; write_term(Value, [quoted(true), variable_names(NewVarList), max_depth(MaxDepth), double_quotes(DQ)]),
; write_term(Value, [quoted(true), variable_names(NewVarList), max_depth(MaxDepth), double_quotes(DQ)|Os]),
( trailing_period_is_ambiguous(Value) ->
write(' ')
; true
@@ -276,7 +281,7 @@ write_last_goal(G, VarList, MaxDepth) :-
)
; G == [] ->
write('true')
; write_term(G, [quoted(true), variable_names(VarList), max_depth(MaxDepth), double_quotes(DQ)])
; write_term(G, [quoted(true), variable_names(VarList), max_depth(MaxDepth), double_quotes(DQ)|Os])
).
write_eq((G1, G2), VarList, MaxDepth) :-