+ feature: return-addresses; lets servlets give more than one possible
address for the next step + plain-html: leaves given text untouched, like quote in scheme don't call it quote, because it is too similar to the HTML's tag <q> (that stands for 'quote')
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@ -158,6 +158,9 @@
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make-image-button
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input-field-value
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input-field-binding
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make-address
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returned-via?
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make-callback))
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(define-structure servlets servlets-interface
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@ -149,12 +149,18 @@
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maybe-text
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URI)"</a>"))))
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(define plain-html-rule
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`(plain-html
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*preorder*
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. ,(lambda (tag . text) text)))
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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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,URL-rule
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,plain-html-rule))
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(define (make-callback function)
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(call-with-current-continuation
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@ -214,11 +220,12 @@
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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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(define generate-unique-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 generate-input-field-name generate-unique-name)
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(define identity (lambda (a) a))
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@ -486,4 +493,30 @@
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(assoc (input-field-name input-field) bindings))
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(define (input-field-binding input-field bindings)
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(real-input-field-binding (cadr input-field) bindings))
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(real-input-field-binding (cadr input-field) bindings))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; return address
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;; generates an unique return-addres
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;; may be used like
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;; (let ((address (make-address)))
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;; (send-html/suspend
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;; (lambda (new-url)
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;; ...
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;; (URL (address new-url) "Click here to get more")...)
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(define (make-address)
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(let ((name (generate-unique-name "return")))
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(lambda (message)
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(cond
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((string? message)
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(string-append message "?" name "="))
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((eq? message 'name)
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name)
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(else ;maybe we want more later...
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(error "unknown message" message name))))))
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(define (returned-via? return-address bindings)
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(assoc (return-address 'name) bindings))
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