reformatting, lots of it
svn: r4929
This commit is contained in:
Eli Barzilay
parent
7746993512
commit
2a4c258bef
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@ -1,9 +1,5 @@
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(module cgi-unit mzscheme
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(require (lib "unitsig.ss")
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(lib "etc.ss"))
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(require "cgi-sig.ss")
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(require (lib "unitsig.ss") "cgi-sig.ss" (lib "etc.ss"))
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(provide net:cgi@)
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(define net:cgi@
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@ -30,8 +26,7 @@
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;; --------------------------------------------------------------------
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;; query-chars->string :
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;; list (char) -> string
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;; query-chars->string : list (char) -> string
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;; -- The input is the characters post-processed as per Web specs, which
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;; is as follows:
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@ -39,57 +34,53 @@
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;; where XX are hex digits, eg, %E7 for ~. The output is a regular
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;; Scheme string with all the characters converted back.
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(define query-chars->string
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(lambda (chars)
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(list->string
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(let loop ((chars chars))
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(if (null? chars) null
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(let ((first (car chars))
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(rest (cdr chars)))
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(let-values (((this rest)
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(cond
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((char=? first #\+)
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(values #\space rest))
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((char=? first #\%)
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(if (and (pair? rest)
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(pair? (cdr rest)))
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(values
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(integer->char
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(or (string->number
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(string
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(car rest) (cadr rest))
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16)
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(raise (make-invalid-%-suffix
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(if (string->number
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(string (car rest))
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16)
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(cadr rest)
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(car rest))))))
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(cddr rest))
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(raise
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(make-incomplete-%-suffix rest))))
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(else
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(values first rest)))))
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(cons this (loop rest)))))))))
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(define (query-chars->string chars)
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(list->string
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(let loop ([chars chars])
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(if (null? chars) null
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(let ([first (car chars)]
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[rest (cdr chars)])
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(let-values ([(this rest)
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(cond
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[(char=? first #\+)
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(values #\space rest)]
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[(char=? first #\%)
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(if (and (pair? rest)
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(pair? (cdr rest)))
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(values
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(integer->char
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(or (string->number
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(string
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(car rest) (cadr rest))
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16)
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(raise (make-invalid-%-suffix
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(if (string->number
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(string (car rest))
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16)
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(cadr rest)
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(car rest))))))
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(cddr rest))
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(raise
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(make-incomplete-%-suffix rest)))]
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[else
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(values first rest)])])
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(cons this (loop rest))))))))
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;; string->html :
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;; string -> string
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;; string->html : string -> string
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;; -- the input is raw text, the output is HTML appropriately quoted
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(define string->html
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(lambda (s)
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(apply string-append
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(map (lambda (c)
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(case c
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((#\<) "<")
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((#\>) ">")
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((#\&) "&")
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(else (string c))))
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(string->list s)))))
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(define (string->html s)
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(apply string-append (map (lambda (c)
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(case c
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[(#\<) "<"]
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[(#\>) ">"]
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[(#\&) "&"]
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[else (string c)]))
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(string->list s))))
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(define default-text-color "#000000")
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(define default-bg-color "#ffffff")
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(define default-link-color "#cc2200")
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(define default-text-color "#000000")
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(define default-bg-color "#ffffff")
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(define default-link-color "#cc2200")
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(define default-vlink-color "#882200")
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(define default-alink-color "#444444")
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@ -97,230 +88,156 @@
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;; html-string x list (html-string) x ... -> ()
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(define generate-html-output
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(opt-lambda (title body-lines
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(text-color default-text-color)
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(bg-color default-bg-color)
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(link-color default-link-color)
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(vlink-color default-vlink-color)
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(alink-color default-alink-color))
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(let ((sa string-append))
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(for-each
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(lambda (l)
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(display l) (newline))
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`("Content-type: text/html"
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""
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"<html>"
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"<!-- The form was processed, and this document was generated,"
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" using the CGI utilities for MzScheme. For more information"
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" on MzScheme, see"
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" http://www.plt-scheme.org/software/mzscheme/"
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" and for the CGI utilities, contact"
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" (sk@cs.brown.edu). -->"
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"<head>"
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,(sa "<title>" title "</title>")
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"</head>"
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""
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,(sa "<body bgcolor=\"" bg-color "\" text=\"" text-color "\"")
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,(sa " link=\"" link-color "\"")
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,(sa " vlink=\"" vlink-color "\" alink=\"" alink-color "\">")
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""
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,@body-lines
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""
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"</body>"
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"</html>")))))
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(opt-lambda (title body-lines
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[text-color default-text-color]
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[bg-color default-bg-color]
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[link-color default-link-color]
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[vlink-color default-vlink-color]
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[alink-color default-alink-color])
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(let ([sa string-append])
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(for-each
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(lambda (l) (display l) (newline))
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`("Content-type: text/html"
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""
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"<html>"
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"<!-- The form was processed, and this document was generated,"
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" using the CGI utilities for MzScheme. For more information"
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" on MzScheme, see"
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" http://www.plt-scheme.org/software/mzscheme/"
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" and for the CGI utilities, contact"
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" (sk@cs.brown.edu). -->"
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"<head>"
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,(sa "<title>" title "</title>")
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"</head>"
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""
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,(sa "<body bgcolor=\"" bg-color "\" text=\"" text-color "\"")
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,(sa " link=\"" link-color "\"")
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,(sa " vlink=\"" vlink-color "\" alink=\"" alink-color "\">")
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""
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,@body-lines
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""
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"</body>"
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"</html>")))))
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;; output-http-headers : -> void
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(define (output-http-headers)
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(printf "Content-type: text/html~a~n~a~n" #\return #\return))
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(printf "Content-type: text/html\r\n\r\n"))
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;; read-until-char :
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;; iport x char -> list (char) x bool
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;; read-until-char : iport x char -> list (char) x bool
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;; -- operates on the default input port; the second value indicates
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;; whether reading stopped because an EOF was hit (as opposed to the
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;; delimiter being seen); the delimiter is not part of the result
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(define (read-until-char ip delimiter)
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(let loop ([chars '()])
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(let ([c (read-char ip)])
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(cond [(eof-object? c) (values (reverse chars) #t)]
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[(char=? c delimiter) (values (reverse chars) #f)]
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[else (loop (cons c chars))]))))
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(define read-until-char
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(lambda (ip delimiter)
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(let loop ((chars '()))
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(let ((c (read-char ip)))
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(cond
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((eof-object? c)
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(values (reverse chars) #t))
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((char=? c delimiter)
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(values (reverse chars) #f))
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(else
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(loop (cons c chars))))))))
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;; read-name+value :
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;; iport -> (symbol + bool) x (string + bool) x bool
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;; read-name+value : iport -> (symbol + bool) x (string + bool) x bool
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;; -- If the first value is false, so is the second, and the third is
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;; true, indicating EOF was reached without any input seen. Otherwise,
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;; the first and second values contain strings and the third is either
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;; true or false depending on whether the EOF has been reached. The
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;; strings are processed to remove the CGI spec "escape"s.
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;; This code is _slightly_ lax: it allows an input to end in `&'. It's
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;; not clear this is legal by the CGI spec, which suggests that the last
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;; value binding must end in an EOF. It doesn't look like this matters.
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;; It would also introduce needless modality and reduce flexibility.
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(define (read-name+value ip)
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(let-values ([(name eof?) (read-until-char ip #\=)])
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(cond [(and eof? (null? name)) (values #f #f #t)]
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[eof?
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(generate-error-output
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(list "Server generated malformed input for POST method:"
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(string-append
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"No binding for `" (list->string name) "' field.")))]
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[else (let-values ([(value eof?) (read-until-char ip #\&)])
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(values (string->symbol (query-chars->string name))
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(query-chars->string value)
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eof?))])))
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(define read-name+value
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(lambda (ip)
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(let-values
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(((name eof?)
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(read-until-char ip #\=)))
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(cond
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((and eof? (null? name))
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(values #f #f #t))
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(eof?
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(generate-error-output
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(list "Server generated malformed input for POST method:"
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(string-append
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"No binding for `" (list->string name) "' field."))))
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(else
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(let-values (((value eof?)
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(read-until-char ip #\&)))
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(values (string->symbol (query-chars->string name))
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(query-chars->string value)
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eof?)))))))
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;; get-bindings/post : () -> bindings
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(define (get-bindings/post)
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(let-values ([(name value eof?) (read-name+value (current-input-port))])
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(cond [(and eof? (not name)) null]
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[(and eof? name) (list (cons name value))]
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[else (cons (cons name value) (get-bindings/post))])))
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;; get-bindings/post :
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;; () -> bindings
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;; get-bindings/get : () -> bindings
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(define (get-bindings/get)
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(let ([p (open-input-string (getenv "QUERY_STRING"))])
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(let loop ()
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(let-values ([(name value eof?) (read-name+value p)])
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(cond [(and eof? (not name)) null]
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[(and eof? name) (list (cons name value))]
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[else (cons (cons name value) (loop))])))))
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(define get-bindings/post
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(lambda ()
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(let-values (((name value eof?)
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(read-name+value
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(current-input-port))))
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(cond
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((and eof? (not name))
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null)
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((and eof? name)
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(list (cons name value)))
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(else
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(cons (cons name value)
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(get-bindings/post)))))))
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;; get-bindings : () -> bindings
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(define (get-bindings)
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(if (string=? (get-cgi-method) "POST")
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(get-bindings/post)
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(get-bindings/get)))
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;; get-bindings/get :
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;; () -> bindings
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;; generate-error-output : list (html-string) -> <exit>
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(define (generate-error-output error-message-lines)
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(generate-html-output "Internal Error" error-message-lines)
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(exit))
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(define get-bindings/get
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(lambda ()
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(let ((p (open-input-string
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(getenv "QUERY_STRING"))))
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(let loop ()
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(let-values (((name value eof?)
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(read-name+value p)))
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(cond
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((and eof? (not name))
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null)
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((and eof? name)
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(list (cons name value)))
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(else
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(cons (cons name value)
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(loop)))))))))
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;; get-bindings :
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;; () -> bindings
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(define get-bindings
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(lambda ()
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(if (string=? (get-cgi-method) "POST")
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(get-bindings/post)
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(get-bindings/get))))
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;; generate-error-output :
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;; list (html-string) -> <exit>
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(define generate-error-output
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(lambda (error-message-lines)
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(generate-html-output "Internal Error"
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error-message-lines)
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(exit)))
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;; bindings-as-html :
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;; bindings -> list (html-string)
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;; bindings-as-html : bindings -> list (html-string)
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;; -- formats name-value bindings as HTML appropriate for displaying
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(define (bindings-as-html bindings)
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`("<code>"
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,@(map (lambda (bind)
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(string-append (symbol->string (car bind))
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" --> "
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(cdr bind)
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"<br>"))
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bindings)
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"</code>"))
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(define bindings-as-html
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(lambda (bindings)
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`("<code>"
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,@(map
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(lambda (bind)
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(string-append
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(symbol->string (car bind))
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" --> "
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(cdr bind)
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"<br>"))
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bindings)
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"</code>")))
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;; extract-bindings :
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;; (string + symbol) x bindings -> list (string)
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;; extract-bindings : (string + symbol) x bindings -> list (string)
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;; -- Extracts the bindings associated with a given name. The semantics
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;; of forms states that a CHECKBOX may use the same NAME field multiple
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;; times. Hence, a list of strings is returned. Note that the result
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;; may be the empty list.
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(define (extract-bindings field-name bindings)
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(let ([field-name (if (symbol? field-name)
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field-name (string->symbol field-name))])
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(let loop ([found null] [bindings bindings])
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(if (null? bindings)
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found
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(if (equal? field-name (caar bindings))
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(loop (cons (cdar bindings) found) (cdr bindings))
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(loop found (cdr bindings)))))))
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(define extract-bindings
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(lambda (field-name bindings)
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(let ((field-name (if (symbol? field-name) field-name
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(string->symbol field-name))))
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(let loop ((found null) (bindings bindings))
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(if (null? bindings)
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found
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(if (equal? field-name (caar bindings))
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(loop (cons (cdar bindings) found) (cdr bindings))
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(loop found (cdr bindings))))))))
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;; extract-binding/single :
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;; (string + symbol) x bindings -> string
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;; extract-binding/single : (string + symbol) x bindings -> string
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;; -- used in cases where only one binding is supposed to occur
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(define (extract-binding/single field-name bindings)
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(let* ([field-name (if (symbol? field-name)
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field-name (string->symbol field-name))]
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[result (extract-bindings field-name bindings)])
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(cond
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[(null? result)
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(generate-error-output
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(cons (format "No binding for field `~a':<br>" field-name)
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(bindings-as-html bindings)))]
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[(null? (cdr result))
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(car result)]
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[else
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(generate-error-output
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(cons (format "Multiple bindings for field `~a' where one expected:<br>"
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field-name)
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(bindings-as-html bindings)))])))
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(define extract-binding/single
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(lambda (field-name bindings)
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(let ((field-name (if (symbol? field-name) field-name
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(string->symbol field-name))))
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(let ((result (extract-bindings field-name bindings)))
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(cond
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((null? result)
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(generate-error-output
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`(,(string-append "No binding for field `"
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(if (symbol? field-name)
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(symbol->string field-name)
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field-name)
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"' in <p>")
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,@(bindings-as-html bindings))))
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((null? (cdr result))
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(car result))
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(else
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(generate-error-output
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`(,(string-append "Multiple bindings for field `"
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(if (symbol? field-name)
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(symbol->string field-name)
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field-name)
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"' where only one was expected in <p>")
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,@(bindings-as-html bindings)))))))))
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;; get-cgi-method :
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;; () -> string
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;; get-cgi-method : () -> string
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;; -- string is either GET or POST (though future extension is possible)
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(define (get-cgi-method)
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(getenv "REQUEST_METHOD"))
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(define get-cgi-method
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(lambda ()
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(getenv "REQUEST_METHOD")))
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;; generate-link-text :
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;; string x html-string -> html-string
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(define generate-link-text
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(lambda (url anchor-text)
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(string-append "<a href=\"" url "\">" anchor-text "</a>")))
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;; ====================================================================
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;; generate-link-text : string x html-string -> html-string
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(define (generate-link-text url anchor-text)
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(string-append "<a href=\"" url "\">" anchor-text "</a>"))
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)))
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