User Tools

Variable *PRINT-CASE*

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).


Although the choice of which characters to escape is specified by *print-case*, the choice of how to escape those haracters (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.

(defun test-print-case () (dolist (*print-case* '(:upcase :downcase :capitalize)) (format t "~&~S ~S~%" 'this-and-that '|And-something-elSE|))) → TEST-PC (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

; Implementation B THIS-AND-THAT |And-something-elSE| this-and-that a|nd-something-el|se This-And-That A|nd-something-el|se


Affected By


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.