87 lines
3.0 KiB
Scheme
Executable File
87 lines
3.0 KiB
Scheme
Executable File
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#| http://tools.ietf.org/html/rfc3986
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query = *( pchar / "/" / "?" )
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pchar = unreserved / pct-encoded / sub-delims / ":" / "@"
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pct-encoded = "%" HEXDIG HEXDIG
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unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
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sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
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/ "*" / "+" / "," / ";" / "="
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|#
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(module cgi (params param)
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(define (parse-query-string str)
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; parse string as (key=value) separated by &s:
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(define (hex->integer c err)
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(let ([n (char->integer c)])
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(cond
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[(fx<= (char->integer #\0) n (char->integer #\9))
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(fx- n (char->integer #\0))]
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[(fx<= (char->integer #\A) n (char->integer #\F))
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(fx+ 10 (fx- n (char->integer #\A)))]
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[(fx<= (char->integer #\a) n (char->integer #\f))
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(fx+ 10 (fx- n (char->integer #\a)))]
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[else (err)])))
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(define (f str i n ac key err)
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(cond
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[(fx= i n)
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(if key
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(list (cons key (list->string (reverse ac))))
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(if (null? ac)
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'()
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(err)))]
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[else
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(let ([c (string-ref str i)])
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(cond
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[(char=? c #\&)
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(if key
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(cons (cons key (list->string (reverse ac)))
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(f str (fxadd1 i) n '() #f err))
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(if (null? ac)
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(f str (fxadd1 i) n '() #f err)
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(err)))]
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[(char=? c #\=)
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(if key
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(f str (fxadd1 i) n (cons c ac) key err)
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(f str (fxadd1 i) n '() (list->string (reverse ac)) err))]
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[(char=? c #\%)
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(if (fx< (fx+ i 2) n)
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(f str (fx+ i 3)
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(cons (integer->char
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(let ([n0 (hex->integer
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(string-ref str (fx+ i 1))
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err)]
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[n1 (hex->integer
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(string-ref str (fx+ i 2))
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err)])
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(fxlogor (fxsll n0 8) n1)))
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ac)
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n key err)
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(err))]
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[(char=? c #\+)
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(f str (fxadd1 i) n (cons #\space ac) key err)]
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[(or (char<=? #\a c #\z)
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(char<=? #\A c #\Z)
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(char<=? #\0 c #\9)
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(memq c '(#\- #\. #\_ #\~ #\! #\$ #\& #\'
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#\( #\) #\* #\, #\; #\= #\: #\@)))
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(f str (fx+ i 1) n (cons c ac) key err)]
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[else (err)]))]))
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(f str 0 (string-length str) '() #f
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(lambda ()
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(error 'parse-query-string "invalid query string ~s" str))))
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(define (params)
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(map car cgi-env))
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(define (param x)
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(cond
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[(assoc x cgi-env) => cdr]
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[else #f]))
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(define cgi-env
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(parse-query-string (env "QUERY_STRING")))
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#|cgi-module|#)
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