One of the symbols :upcase, :downcase, or :capitalize.
The symbol :upcase.
The value of
*print-case* controls the case (upper, lower, or mixed) in
which to print any uppercase characters in the names of symbols
when vertical-bar syntax is not used.
*print-case* has an effect at all times when the value of
*print-case* also has an effect when
the value of
*print-escape* is true unless inside an escape context
(i.e., unless between vertical-bars or after a slash).
(defun test-print-case () (dolist (*print-case* '(:upcase :downcase :capitalize)) (format t "~&~S ~S~%" 'this-and-that '|And-something-elSE|))) → TEST-PC ;; Although the choice of which characters to escape is specified by ;; *PRINT-CASE*, the choice of how to escape those characters ;; (i.e., whether single escapes or multiple escapes are used) ;; is implementation-dependent. The examples here show two of the ;; many valid ways in which escaping might appear. (test-print-case) ;Implementation A ▷ THIS-AND-THAT |And-something-elSE| ▷ this-and-that a\n\d-\s\o\m\e\t\h\i\n\g-\e\lse ▷ This-And-That A\n\d-\s\o\m\e\t\h\i\n\g-\e\lse → NIL (test-print-case) ;Implementation B ▷ THIS-AND-THAT |And-something-elSE| ▷ this-and-that a|nd-something-el|se ▷ This-And-That A|nd-something-el|se → NIL
read normally converts lowercase characters appearing
in symbols to corresponding uppercase characters,
so that internally print names normally contain only uppercase characters.
*print-escape* is true,
lowercase characters in the name of a symbol
are always printed in lowercase, and
are preceded by a single escape character
or enclosed by multiple escape characters;
uppercase characters in the name of a symbol
are printed in upper case, in lower case, or in mixed case
so as to capitalize words, according to the value of
*print-case*. The convention for what constitutes
a “word” is the same as for