sunet/scheme/httpd/surflets/utilities.scm

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;; utilities for plugin (servlets)
;; Copyright 2002, Andreas Bernauer
(define (send-html/suspend html-tree-maker)
(send/suspend
(lambda (new-url)
(make-usual-html-response
(lambda (out options)
(with-current-output-port* ; FIXME: will change in further revision
out
(lambda () (SXML->HTML (html-tree-maker new-url)))))))))
(define (send-html/finish html-tree)
(do-sending send/finish html-tree))
(define (send-html html-tree)
(do-sending send html-tree))
(define (do-sending sending-version html-tree)
(sending-version
(make-usual-html-response
(lambda (out options)
(with-current-output-port* ; FIXME: will change in further revision
out
(lambda () (SXML->HTML html-tree)))))))
(
(define (make-usual-html-response writer-proc)
(make-response
http-status/ok
(status-code->text http-status/ok)
(time)
"text/html"
'()
(make-writer-body writer-proc)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;; from cgi-script:
;;; Return the form data as an alist of decoded strings.
;;; So a query string like "button=on&reply=Oh,%20yes" becomes alist
;;; (("button" . "on") ("reply" . "Oh, yes"))
;;; This only works for GET and POST methods.
(define form-query parse-html-form-query)
(define (extract-bindings bindings key)
(let ((key (if (symbol? key) (symbol->string key) key)))
(filter (lambda (binding)
(equal? (car binding) key))
bindings)))
(define (extract-single-binding bindings key)
(let ((key-bindings (extract-bindings bindings key)))
(if (= 1 (length key-bindings))
(cdar key-bindings)
(error "extract-one-binding: more than one or zero bindings found"
(length key-bindings)
key bindings))))