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Simplify decoding code into one `cond'.

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(It's likely to get written in some better way, for example, avoid the
extra work for simple strings.)
(cherry picked from commit 210c71d91c)
This commit is contained in:
Eli Barzilay 2013-07-05 18:07:07 -04:00 committed by Ryan Culpepper
parent eb9b3e109a
commit cc655dc13b
1 changed files with 10 additions and 10 deletions
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18
collects/net/uri-codec.rkt
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@ -172,16 +172,16 @@ See more in PR8831.
(if (null? l) '()
(let* ([c (car l)] [l (cdr l)]
[hex (and (equal? #\% c) (pair? l) (pair? (cdr l))
(string->number (string (car l) (cadr l)) 16))])
(if hex
(cons hex (internal-decode (cddr l)))
(append (if (char<? c max-ascii)
(list (vector-ref table (char->integer c)))
(string->number (string (car l) (cadr l)) 16))]
[rest (internal-decode (if hex (cddr l) l))])
(cond [hex (cons hex rest)]
[(char<? c max-ascii) (cons (vector-ref table (char->integer c))
rest)]
;; This should probably error, but strings to be decoded
;; might come from misbehaving sources; maybe it's better
;; to add some parameter for a permissive mode
(bytes->list (string->bytes/utf-8 (string c))))
(internal-decode l))))))
;; might come from misbehaving sources; maybe it's
;; better to add some parameter for a permissive mode
[else (append (bytes->list (string->bytes/utf-8 (string c)))
(internal-decode l))]))))
(bytes->string/utf-8 (apply bytes (internal-decode (string->list str)))))
;; Utility for defining codecs