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Added (char-downcase)

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Justin Ethier 2015-03-26 13:13:32 -04:00
parent 11d861a97c
commit bc151ed781
1 changed files with 10 additions and 1 deletions
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11
trans.scm
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@ -72,13 +72,22 @@
(define (char>? c1 c2 . cs) (Cyc-bin-op-char > c1 (cons c2 cs)))
(define (char<=? c1 c2 . cs) (Cyc-bin-op-char <= c1 (cons c2 cs)))
(define (char>=? c1 c2 . cs) (Cyc-bin-op-char >= c1 (cons c2 cs)))
(define (char-upcase c)
; TODO: char-ci predicates
(define (char-upcase c) ;; ASCII-only
(if (char-lower-case? c)
(integer->char
(- (char->integer c)
(- (char->integer #\a)
(char->integer #\A))))
c))
(define (char-downcase c) ;; ASCII-only
(if (char-upper-case? c)
(integer->char
(+ (char->integer c)
(- (char->integer #\a)
(char->integer #\A))))
c))
; TODO: char-foldcase
(define (char-alphabetic? c) (and (char>=? c #\A) (char<=? c #\z))) ;; ASCII-only
(define (char-upper-case? c) (and (char>=? c #\A) (char<=? c #\Z))) ;; ASCII-only
(define (char-lower-case? c) (and (char>=? c #\a) (char<=? c #\z))) ;; ASCII-only