counting.laml - Element counting.

Slide 22 : 26 Program 3

(load (string-append laml-dir "laml.scm"))
(laml-style "simple-xhtml1.0-transitional-validating")
(lib-load "xhtml1.0-convenience.scm")
(set-xml-accept-extended-contents-in 'xhtml10-transitional #t)

(define meta-props 
 (list 'http-equiv "Content-Type" 'content "text/html; charset=iso-8859-1"))

; Return a meta text keywords from the emphasized words in the entire document.
(define (count-elements el-name)
  (lambda (root-ast parent-ast)
    (length (match-ast root-ast (location-step 'descendant "p")))))

(define keyword 
  (xml-in-laml-abstraction 
    (lambda (c a) (span 'class "keyword" c a))))

(write-html '(pp prolog)
 (html 
  (head 
   (meta meta-props) 
   (title "Demo of simple document reflection"))
  (body 
    (h1 "Illustration of element counting")

    (p "This document has" (count-elements "p") "paragraphs.")

    (p "This is a demo of simple document introspection aided by" 
       (keyword "delayed procedural content items")_ "." )

    (p "A delayed procedural content item is a" (keyword "closure") 
       "which is evaluated at" (keyword "documentation expansion time") _ "." )

    (p "We show how to extract" (keyword "meta keywords") 
       "from designated and marked up keywords in the text. Notice that the keyword
        element mirror function is produced by an XML-in-LAML abstraction." )

    (when-generated))))

(end-laml)