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lisp-html's Introduction

lisp-html

Introduzione

lisp-html genera codice html a partire da codice lisp data la similitudine tra l’html e il codice lisp, almeno in quanto alberi, la struttura dell’html è la stessa del codice lisp che lo genera, ad esempio

(with-tags (h1 "hello")
  (ul
   (li "here")
   (li "is")
   (li "a little")
   (li "list")))

si traudce banalmente in

<h1>hello</h1>
<ul>
  <li>here</li>
  <li>is</li>
  <li>a little</li>
  <li>list</li>
</ul>

Codice arbitrario

lisp-html permette di avere codice arbitrario all’interno delle tag, e mira al separare il meno possibile la logica di esecuzione di lisp dalla logica di scrittura dell’html. questo permette di avere cose quali

(defun fizzbuzz (x)
  (cond ((= (mod x 15) 0) "FizzBuzz")
        ((= (mod x 3) 0) "Fizz")
        ((= (mod x 5) 0) "Buzz")))

(with-tags
  (ul
   (dotimes (x 20)
     (li x " : " (fizzbuzz x)))))

che generano effettivamente

<ul>
  <li>0 : FizzBuzz</li>
  <li>1 : 1</li>
  <li>2 : 2</li>
  <li>3 : Fizz</li>
  <li>4 : 4</li>
  <li>5 : Buzz</li>
  <li>6 : Fizz</li>
  <li>7 : 7</li>
  <li>8 : 8</li>
  <li>9 : Fizz</li>
  <li>10 : Buzz</li>
  <li>11 : 11</li>
  ...
</ul>

il dotimes all’interno del codice in questione non è un costrutto di lisp-html, ed è invece un normalissimo dotimes di common lisp, che ha ciclato i numeri da 0..20 e ha generato (li x " : " (fizzbuzz x)) per ognuno di questi

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