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Missing space in portray_clause/2 #2713

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notoria opened this issue Dec 17, 2024 · 0 comments
Open

Missing space in portray_clause/2 #2713

notoria opened this issue Dec 17, 2024 · 0 comments

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@notoria
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notoria commented Dec 17, 2024

I tried this:

?- portray_clause(user_output, X= @).
A= @.
   true.
?-

Expected: A= @ .
triska added a commit to triska/scryer-prolog that referenced this issue Dec 17, 2024
@triska
introduce and use literal_//2 to prevent accidental amalgamation of g…
67503de 
…raphic chars

This addresses mthom#2713. Many thanks to @notoria for reporting this
excellent case!

Example:

    ?- portray_clause(A = @).
    A= @ .
       true.

At other positions the now inserted space is unnecessary, as in:

    ?- portray_clause((head:- @,b)).
    head :-
       @ ,
       b.
       true.

The toplevel has a similar issue:

    ?- C = # ; false.
       C = # |<-- cursor is here; redundant space after #

There may be a way to solve this issue for all cases like this.
triska added a commit to triska/scryer-prolog that referenced this issue Dec 17, 2024
@triska
prevent accidental amalgamation of graphic token chars in output
6175e33 
This addresses mthom#2713. Many thanks to @notoria for reporting this
excellent case!

Example:

    ?- portray_clause(A = @).
    A= @ .
       true.

At other positions the now inserted space is unnecessary, as in:

    ?- portray_clause((head:- @,b)).
    head :-
       @ ,
       b.
       true.

The toplevel has a similar issue:

    ?- C = # ; false.
       C = # |<-- cursor is here; redundant space after #

There may be a way to solve this issue for all cases like this.
@triska triska mentioned this issue Dec 17, 2024
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@notoria