*template-chars*

The value of this variable is an association list describing how various characters in a template-string are to be interpreted. Each entry in the list consists of:

1. a template-character,
2. a predicate function that determines which characters may be typed by the user at positions where that template character is specified (this predicate should take one argument, which should be a character, and return non-nil if the character passed to it is allowed), and
3. a character to initially display in the component at the positions of that template character (these are all #\space by default).

The initial value of this list is:

(
    
 ;; A space character allows the user to type any graphical
 ;; character, and initially prints a space.
 (#\space graphic-char-p #\space)
 
 ;; A "c" allows any letter or numeral to be typed, while
 ;; an "a" allows only letters.
 (#\c alphanumericp #\space)
 (#\a alpha-char-p #\space)
 
 ;; A zero requires a numeral to be typed and also displays
 ;; a zero initially.
 (#\0 digit-char-p #\0)
 
 ;; A 9 allows only a numeral, even though it initially
 ;; displays a space (which makes it clear that nothing
 ;; has been entered there yet).
 (#\9 digit-char-p #\space)
 
 ;; These two both allow either a numeral or a space,
 ;; but differ in the initially-printed character.
 (#\8 digit-char-or-space-p #\0) 
 (#\7 digit-char-or-space-p #\space) 
 
 )

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Created 2010.1.21.