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<?php
namespace Gt\Dom;
/**
* Represents a set of space-separated tokens. Such a set is returned by
* Element::$classList, HTMLLinkElement::$relList, HTMLAnchorElement::$relList
* or HTMLAreaElement::$relList.
*
* It is indexed beginning with 0 as with arrays.
*
* DOMTokenList is always case-sensitive.
* @property-read int $length
*/
class TokenList {
use LiveProperty;
private $element;
private $attributeName;
private $tokenArray;
public function __construct(Element $element, string $attributeName) {
$this->element = $element;
$this->attributeName = $attributeName;
}
/**
* Tokenises the internal element's named attribute to $this->tokenArray.
*/
private function tok():void {
$attributeValue = $this->element->getAttribute($this->attributeName);
$this->tokenArray = array_filter(
explode(" ", $attributeValue)
);
}
/**
* Untokenises $this->tokenArray to the internal element's named attribute.
*/
private function untok():void {
$attributeValue = implode(" ", $this->tokenArray);
$this->element->setAttribute($this->attributeName, trim($attributeValue));
}
protected function prop_get_length() {
$this->tok();
return count($this->tokenArray);
}
/**
* Returns an item in the list by its index (or null if the number is
* greater than or equal to the length of the list).
* @param int $index
* @return string|null
*/
public function item(int $index) {
$this->tok();
return $this->tokenArray[$index] ?? null;
}
/**
* Returns true if the underlying string contains $token, otherwise false.
* @param string $token
* @return bool
*/
public function contains(string $token) {
$this->tok();
return in_array($token, $this->tokenArray);
}
/**
* Adds $token to the underlying attribute value.
* @param string $token
* @return void
*/
public function add(string $token):void {
if($this->contains($token)) {
return;
}
$this->tokenArray [] = $token;
$this->untok();
}
/**
* Removes $token from the underlying attribute value.
* @param string $token
* @return null
*/
public function remove(string $token):void {
if(!$this->contains($token)) {
return;
}
$index = array_search($token, $this->tokenArray);
unset($this->tokenArray[$index]);
$this->untok();
}
/**
* Removes $token from the underlying attribute value and returns false. If
* $token doesn't exist, it's added and the function returns true.
* @param string $token
* @return bool true if token is added, false if token is removed.
*/
public function toggle(string $token):bool {
if($this->contains($token)) {
$this->remove($token);
return false;
}
$this->add($token);
return true;
}
public function __toString() {
return join(" ", $this->tokenArray);
}
}