((( [logo]Racket )))Need Help?
AboutDownloadDocumentationPLaneTCommunityLearning

[plt-scheme] Beautify (auto-)generated HTML-Code of servlets

From: Jens Axel Søgaard (jensaxel at soegaard.net)
Date: Wed Jan 3 18:44:07 EST 2007		 
Stefan Fehrenbach skrev:
> Danny Yoo wrote:

> I thought I could make the server use the library you pointed to or 
> something in this direction.
> 
>> we can do the conversion ourselves, and then pass that back as the 
>> response.
> 
> I'll think of this, would allow me to print the <!DOCTYPE...> too.

The normal xml-library provides pretty printing:

(require (lib "xml.ss" "xml"))

(define (xexpr->pretty-string xexpr)
   (let ([os (open-output-string)])
     (display-xml/content
        (xexpr->xml xexpr) os)
     (get-output-string os)))

 > (display (xexpr->pretty-string
             '(html (head (title "A title"))
                    (body "Foo"))))

<html>
   <head>
     <title>
       A title
     </title>
   </head>
   <body>
     Foo
   </body>
</html>


Generating a response can be done in many ways, for example
in the following non-standard way:

(require (planet "web.scm" ("soegaard" "web.plt" 1 0))
          (lib "xml.ss" "xml"))

(define (xexpr->pretty-string xexpr)
   (let ([os (open-output-string)])
     (display-xml/content
      (xexpr->xml xexpr)
      os)
     (get-output-string os)))

(make-response
  (xexpr->pretty-string
   '(html (head (title "A title"))
          (body "Foo"))))


See

<http://ja.soegaard.net/planet/html/soegaard/web.plt/current/doc.txt>

for more on make-response.

-- 
Jens Axel Søgaard
<http://www.scheme.dk/blog/>
Posted on the users mailing list.