495 lines
15 KiB
Scheme
495 lines
15 KiB
Scheme
;; utilities for servlet
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;; Copyright 2002, Andreas Bernauer
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(define (send-html/suspend html-tree-maker)
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(send/suspend
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(lambda (new-url)
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(make-usual-html-response
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(lambda (out options)
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(servlet-XML->HTML out (html-tree-maker new-url)))))))
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(define (send-html/finish html-tree)
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(do-sending send/finish html-tree))
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(define (send-html html-tree)
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(do-sending send html-tree))
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(define (do-sending send html-tree)
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(send (make-usual-html-response
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(lambda (out options)
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(servlet-XML->HTML out html-tree)))))
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(define (make-usual-html-response writer-proc)
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(make-response
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http-status/ok
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(status-code->text http-status/ok)
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(time)
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"text/html"
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'()
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(make-writer-body writer-proc)))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; from cgi-script:
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;;; Return the form data as an alist of decoded strings.
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;;; So a query string like "button=on&reply=Oh,%20yes" becomes alist
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;;; (("button" . "on") ("reply" . "Oh, yes"))
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;;; This only works for GET and POST methods.
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(define form-query parse-html-form-query)
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(define (get-bindings request)
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(form-query (http-url:search (request:url request))))
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(define (extract-bindings bindings key)
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(let ((key (if (symbol? key) (symbol->string key) key)))
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(filter (lambda (binding)
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(equal? (car binding) key))
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bindings)))
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(define (extract-single-binding bindings key)
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(let ((key-bindings (extract-bindings bindings key)))
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(if (= 1 (length key-bindings))
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(cdar key-bindings)
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(error "extract-one-binding: more than one or zero bindings found"
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(length key-bindings)
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key bindings))))
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;; adapted from Oleg's SXML-tree-trans.scm
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;; extended by port argument
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;; #t: current-output-port
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;; #f: string
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;; port: port
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;; else: error
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(define (formated-reply port . fragments)
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(cond
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((not port)
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(call-with-string-output-port
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(lambda (port)
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(real-formated-reply port fragments))))
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((eq? port #t)
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(real-formated-reply (current-output-port) fragments))
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((output-port? port)
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(real-formated-reply port fragments))
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(else
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(error "invalid port argument to FORMATED-REPLY" port))))
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(define (real-formated-reply port fragments)
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(let loop ((fragments fragments) (result #f))
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(cond
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((null? fragments) result)
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((not (car fragments)) (loop (cdr fragments) result))
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((null? (car fragments)) (loop (cdr fragments) result))
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((pair? (car fragments))
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(loop (cdr fragments) (loop (car fragments) result)))
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((procedure? (car fragments))
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((car fragments))
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(loop (cdr fragments) #t))
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(else
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(display (car fragments) port)
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(loop (cdr fragments) #t)))))
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;; adapted from Oleg's SXML-to-HTML.scm
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;; extended by additional port argument
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(define (servlet-XML->HTML out html-tree)
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(formated-reply out
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(reformat html-tree)))
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(define (reformat html-tree)
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(pre-post-order
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html-tree
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`(
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;; Universal transformation rules. Works for every HTML,
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;; present and future
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,@default-rules
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(input-field
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*preorder*
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. ,(lambda (trigger input-field)
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(reformat (input-field-HTML-tree input-field))))
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(servlet-form
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;; Must do something to prevent the callback-function string to
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;; be HTML escaped.
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*preorder*
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. ,(lambda (trigger call-back-function . elems)
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(if (and (pair? elems)
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(XML-attribute? (car elems)))
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(make-servlet-form call-back-function (cdar elems) (cdr elems))
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(make-servlet-form call-back-function'() elems)))))
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))
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(define (make-servlet-form call-back-function attributes elems)
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`("<form" ,@(map (lambda (attribute-value)
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((enattr (car attribute-value)) (cadr attribute-value)))
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`((method "GET")
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(action ,call-back-function)
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,@attributes))
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#\> #\newline
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,(reformat elems)
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"</form>"))
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(define (XML-attribute? thing)
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(and (pair? thing)
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(eq? '@ (car thing))))
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(define attribute-rule
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`(@ ; local override for attributes
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((*default*
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. ,(lambda (attr-key . value) ((enattr attr-key) value))))
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. ,(lambda (trigger . value) (list '@ value))))
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(define text-rule
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`(*text*
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. ,(lambda (trigger str)
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(if (string? str) (string->goodHTML str) str))))
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(define URL-rule
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(cons 'URL
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(lambda (tag URI . maybe-text) (list "<a href=\"" URI "\">"
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(if (pair? maybe-text)
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maybe-text
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URI)"</a>"))))
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(define default-rules
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`(,attribute-rule
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(*default*
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. ,(lambda (tag . elems) (apply (entag tag) elems)))
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,text-rule
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,URL-rule))
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(define (make-callback function)
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(call-with-current-continuation
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(lambda (exit)
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(let* ((req (send/suspend (lambda (new-url)
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(exit new-url)))))
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(function req)))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; outdater
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(define-record-type outdater :outdater
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(real-make-outdater outdated?)
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outdater?
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(outdated? outdater-outdated? set-outdater-outdated?!))
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(define (make-outdater)
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(real-make-outdater #f))
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(define-syntax if-outdated
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(syntax-rules ()
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((if-outdated outdater consequence alternative)
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(if (outdater-outdated? outdater)
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consequence
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(begin
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(set-outdater-outdated?! outdater #t)
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alternative)))))
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(define (show-outdated url)
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(send-html
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`(html (title "Outdated Data")
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(body (h1 "Outdated Data")
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(p "The page or action you requested relies on outdated data")
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(p "Try to "
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(URL ,url "reload")
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" the page to get current data.")))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; input-fields
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;;; defines input-fields for servlets
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(define-record-type input-field :input-field
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(real-make-input-field name transformer HTML-tree get-bindings?)
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input-field?
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(name input-field-name)
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(transformer input-field-transformer)
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(attributes input-field-attributes)
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(HTML-tree input-field-HTML-tree)
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(get-bindings? input-field-get-bindings?))
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(define-record-discloser :input-field
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(lambda (input-field)
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(list 'input-field
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(input-field-name input-field))))
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;; FIXME: consider creating small names
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(define generate-input-field-name
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(let ((id 0))
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(lambda (type-string)
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(set! id (+ 1 id))
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(string-append type-string (number->string id)))))
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(define identity (lambda (a) a))
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(define (make-input-field name transformer HTML-tree)
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(list 'input-field (real-make-input-field name transformer HTML-tree #f)))
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(define (make-upper-input-field transformer HTML-tree)
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(list 'input-field (real-make-input-field #f transformer HTML-tree #t)))
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;; PRED-LIST contains list of predicates that recognizes optional
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;; leading parameters. FURTHER-ATTRIBUTES is the optional parameter
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;; list as got by procedure call. PREFIX-OPTIONALS returns two values:
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;; a list of the same length as PRED-LIST and a list containing the
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;; left arguments that did not fit the predicates.
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;;
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;; With the help of PREFIX-OPTIONALS you can define a function
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;; like `make-submit-button [string] [further-attributes]' this way:
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;; (define (make-submit-button . args)
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;; (receive (params rest-args)
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;; (prefix-optionals (list string? XML-attribute?) args)
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;; (if (pair? rest-args)
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;; (error "too many arguments to make-submit-button))
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;; (let ((value (first params))
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;; (attributes (second params)))
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;; ...))))
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;;
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(define (typed-optionals pred-list args)
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(let loop ((results '())
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(pred-list pred-list)
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(args args))
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(cond
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((null? pred-list)
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(values (reverse results) args))
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((null? args)
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(values (rev-append results (make-list (length pred-list) #f)) '()))
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(((car pred-list) (car args))
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(loop (cons (car args) results)
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(cdr pred-list)
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(cdr args)))
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(else
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(loop (cons #f results)
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(cdr pred-list)
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args)))))
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(define-syntax optionals
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(lambda (exp rename compare)
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(let ((%receive (rename 'receive))
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(%typed-optionals (rename 'typed-optionals))
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(%list (rename 'list))
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(%if (rename 'if))
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(%pair? (rename 'pair?))
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(%error (rename 'error))
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(%let (rename 'let))
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(%list-ref (rename 'list-ref))
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(args (cadr exp))
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(var-list (caddr exp))
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(body (cadddr exp)))
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`(,%receive (params rest-args)
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(,%typed-optionals (,%list ,@(map cadr var-list)) ,args)
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(,%if (pair? rest-args)
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(,%error "optionals: too many arguments and/or argument type mismatch")
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(,%let (,@(let loop ((counter 0)
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(var-list var-list))
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(if (null? var-list)
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'()
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(cons (cons (caar var-list) `((,%list-ref params ,counter)))
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(loop (+ 1 counter)
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(cdr var-list))))))
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,body))))))
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;; from uri.scm
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(define (rev-append a b) ; (append (reverse a) b)
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(let rev-app ((a a) (b b)) ; Should be defined in a list-proc
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(if (pair? a) ; package, not here.
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(rev-app (cdr a) (cons (car a) b))
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b)))
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(define (make-text-input-field . maybe-further-attributes)
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(let ((name (generate-input-field-name "text")))
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(optionals maybe-further-attributes
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((default-text string?)
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(attributes XML-attribute?))
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(make-input-field name
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identity
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`(input (@ (type "text")
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(name ,name)
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,(and default-text `(value ,default-text))
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;; this will insert a list, but
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;; XML->HTML doesn't care about it
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,(and attributes (cdr attributes))
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))))))
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(define make-number-input-field
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(let ((number-input-field-transformer
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(lambda (string)
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(or (string->number string)
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(error "wrong type")))
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))
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(lambda maybe-further-attributes)
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(let ((name (generate-input-field-name "number")))
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(optionals maybe-further-attributes
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((attributes XML-attribute?))
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(make-input-field
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name
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number-input-field-transformer
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`(input (@ (type "text")
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(name ,name)
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,(and attributes (cdr attributes))))))))
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(define (make-password-input-field . maybe-further-attributes)
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(let ((name (generate-input-field-name "password")))
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(optionals maybe-further-attributes
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((attributes XML-attribute?))
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(make-input-field
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name
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identity
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`(input (@ (type "password")
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(name ,name)
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,@(and attributes (cdr attributes))))))))
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(define (make-textarea-input-field . maybe-further-attributes)
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(let ((name (generate-input-field-name "textarea")))
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(optionals maybe-further-attributes
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((default-text string?)
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(attributes XML-attribute?))
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(make-input-field
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name
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identity
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`(textarea (@ (type "textarea")
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(name ,name)
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,(and attributes (cdr attributes)))
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,(and default-text))))))
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;(make-select-input-fields '("this" "that" "those") '(@ ((id "sushi"))))
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;(make-select-input-fields '("this" ("that" '(@ (selected))) "those"))
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;; dropdown: (size 1)
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;; multiple choice: (multiple)
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;; preselected option: (selected)
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;; changed return value: (value new-value)
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;; returns a select input field with several options
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(define (make-select-input-field options . maybe-further-attributes)
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(let ((name (generate-input-field-name "select")))
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(optionals maybe-further-attributes
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((attributes XML-attribute?))
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(make-input-field
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name
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identity ;FIXME[extension] refer to list elements
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`(select (@ ((name ,name)
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,(and attributes (cdr attributes))))
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#\newline
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,@(map (lambda (option)
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(cond
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((string? option)
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(list 'option option))
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((list? option)
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(cond
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((null? (cdr option))
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`(option ,option))
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((XML-attribute? (cadr option)) ; with attributes?
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`(option ,(cadr option) ,(car option)))
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(else
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(error "not an attribute" (cdr option)))))
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(else
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(error "not an option" option))))
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options))))))
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;; returns a *list* of radio buttons
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(define (make-radio-input-fields values . maybe-further-attributes)
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(let ((name (generate-input-field-name "radio")))
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(optionals maybe-further-attributes
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((attributes XML-attribute?))
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(map (lambda (value)
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(let ((value-value (if (pair? value) (car value) value))
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(value-attributes (if (pair? value)
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(if (XML-attribute? (cadr value))
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(cdadr value)
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(error "not an attribute" cadr value))
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#f)))
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(make-input-field
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name
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(lambda (select)
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select) ;FIXME refer to list elements
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`(input (@ ((type "radio")
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(name ,name)
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(value ,value-value)
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,(and value-attributes)
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,(and attributes (cdr attributes))))))))
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values))))
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;; returns a checkbox input field
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(define (make-checkbox-input-field . maybe-further-attributes)
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(let* ((name (generate-input-field-name "checkbox")))
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(optionals maybe-further-attributes
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((value (lambda (a) (or (string? a)
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(number? a)
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(symbol? a))))
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(attributes XML-attribute?))
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(make-input-field
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name
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identity
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`(input (@ ((type "checkbox")
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(name ,name)
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,(if value `(value ,value) '())
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,(and attributes (cdr attributes)))))))))
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(define (make-hidden-input-field value . maybe-further-attributes)
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(let ((name (generate-input-field-name "hidden")))
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(optionals maybe-further-attributes
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((attributes XML-attribute?))
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(make-input-field name
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identity
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`(input (@ (type "hidden")
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(name ,name)
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(value ,value)
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,(and attributes (cdr attributes))))))))
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(define (make-button type button-caption attributes)
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`(input (@ (type ,type)
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,(and button-caption `(value ,button-caption))
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,(and attributes (cdr attributes)))))
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(define (string-or-symbol? a)
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(or (string? a)
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(symbol? a)))
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(define (make-submit-button . maybe-further-attributes)
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(optionals maybe-further-attributes
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((button-caption string-or-symbol?)
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(attributes XML-attribute?))
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(make-button "submit" button-caption attributes)))
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(define (make-reset-button . maybe-further-attributes)
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(optionals maybe-further-attributes
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((button-caption string-or-symbol?)
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(attributes XML-attribute?))
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(make-button "reset" button-caption attributes)))
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(define (make-image-button image-source . maybe-further-attributes)
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(optionals maybe-further-attributes
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((attributes XML-attribute?))
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(make-button "image" #f `(@ (src ,image-source)
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,@(if attributes (cdr attributes) '())))))
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(define (input-field-value input-field bindings)
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(let ((input-field (cadr input-field)))
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(cond
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((input-field-get-bindings? input-field)
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((input-field-transformer input-field) bindings))
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((assoc (input-field-name input-field) bindings) =>
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(lambda (binding)
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((input-field-transformer input-field) (cdr binding))))
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(else
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(error "no such input-field" input-field bindings)))))
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;;; tests
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(define number-input-field (make-number-input-field))
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(define test
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`(html
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(title "My Title")
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(body
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(p (URL "reset" "click here to reset"))
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(p (form "return-URI" (table (tr (td "Enter a number ") (td ,number-input-field )))
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,(make-submit-button))))))
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