in the C function @code{sprintf}. For further restrictions on what
you can use, see the variable's documentation string.
@end defvar
+
+@defvar integer-output-format
+This variable specifies how to print integer numbers. The default is
+@code{nil}, meaning use the decimal format. When bound to @code{t},
+print integers as characters when an integer represents a character
+(@pxref{Basic Char Syntax}). When bound to the number @code{16},
+print non-negative integers in the hexadecimal format.
+@end defvar
\f
* Lisp Changes in Emacs 28.1
+** New variable 'integer-output-format' determines how to print integer values.
+When this variable is bound to the value 't', integers are printed by
+printing functions as characters when an integer represents a character.
+When bound to the number 16, non-negative integers are printed in the
+hexadecimal format.
+
+++
** 'define-globalized-minor-mode' now takes a :predicate parameter.
This can be used to control which major modes the minor mode should be
{
case_Lisp_Int:
{
- int len = sprintf (buf, "%"pI"d", XFIXNUM (obj));
- strout (buf, len, len, printcharfun);
+ int c;
+ intmax_t i;
+
+ if (EQ (Vinteger_output_format, Qt) && CHARACTERP (obj)
+ && (c = XFIXNUM (obj)))
+ {
+ printchar ('?', printcharfun);
+ if (escapeflag
+ && (c == ';' || c == '(' || c == ')' || c == '{' || c == '}'
+ || c == '[' || c == ']' || c == '\"' || c == '\'' || c == '\\'))
+ printchar ('\\', printcharfun);
+ printchar (c, printcharfun);
+ }
+ else if (INTEGERP (Vinteger_output_format)
+ && integer_to_intmax (Vinteger_output_format, &i)
+ && i == 16 && !NILP (Fnatnump (obj)))
+ {
+ int len = sprintf (buf, "#x%"pI"x", (EMACS_UINT) XFIXNUM (obj));
+ strout (buf, len, len, printcharfun);
+ }
+ else
+ {
+ int len = sprintf (buf, "%"pI"d", XFIXNUM (obj));
+ strout (buf, len, len, printcharfun);
+ }
}
break;
that represents the number without losing information. */);
Vfloat_output_format = Qnil;
+ DEFVAR_LISP ("integer-output-format", Vinteger_output_format,
+ doc: /* The format used to print integers.
+When t, print characters from integers that represent a character.
+When a number 16, print non-negative integers in the hexadecimal format.
+Otherwise, by default print integers in the decimal format. */);
+ Vinteger_output_format = Qnil;
+
DEFVAR_LISP ("print-length", Vprint_length,
doc: /* Maximum length of list to print before abbreviating.
A value of nil means no limit. See also `eval-expression-print-length'. */);
(let ((print-length 1))
(format "%S" h))))))
+(print-tests--deftest print-integer-output-format ()
+ ;; Bug#44155.
+ (let ((integer-output-format t)
+ (syms (list ?? ?\; ?\( ?\) ?\{ ?\} ?\[ ?\] ?\" ?\' ?\\ ?Á)))
+ (should (equal (read (print-tests--prin1-to-string syms)) syms))
+ (should (equal (print-tests--prin1-to-string syms)
+ (concat "(" (mapconcat #'prin1-char syms " ") ")"))))
+ (let ((integer-output-format t)
+ (syms (list -1 0 1 ?\120 4194175 4194176 (max-char) (1+ (max-char)))))
+ (should (equal (read (print-tests--prin1-to-string syms)) syms)))
+ (let ((integer-output-format 16)
+ (syms (list -1 0 1 most-positive-fixnum (1+ most-positive-fixnum))))
+ (should (equal (read (print-tests--prin1-to-string syms)) syms))
+ (should (equal (print-tests--prin1-to-string syms)
+ (concat "(" (mapconcat
+ (lambda (i)
+ (if (and (>= i 0) (<= i most-positive-fixnum))
+ (format "#x%x" i) (format "%d" i)))
+ syms " ") ")")))))
+
(provide 'print-tests)
;;; print-tests.el ends here