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| ANSI Common Lisp 22 Printer 22.4 Dictionary of Printer
22.4.18 *print-case* | Variable
  Value Type: One of the symbols `:upcase`, `:downcase`, or `:capitalize`. Initial Value: The symbol `:upcase`. Description: 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). Examples:
       (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
See Also: write Notes: 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: None.

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