ANSI Common Lisp 22 Printer 22.4 Dictionary of Printer
- Value Type:
One of the symbols :upcase, :downcase, or :capitalize.
- Initial Value:
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-escape*
is false. *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|)))
;; 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
(test-print-case) ;Implementation B
- See Also:
read normally converts lowercase characters appearing
in symbols to corresponding uppercase characters,
so that internally print names normally contain only uppercase characters.
If *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 string-capitalize.
- Allegro CL Implementation Details: