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<?php
namespace Gt\Dom;
use Countable;
#[\AllowDynamicProperties]
class DOMStringMap implements Countable {
/** @var callable */
private $getterCallback;
/** @var callable */
private $setterCallback;
/**
* @param callable $getterCallback Returns an associative array of
* key-value-pairs, no parameters.
* @param callable $setterCallback Takes an associative array of
* key-value-pairs as the only parameter.
*/
public function __construct(
callable $getterCallback,
callable $setterCallback
) {
$this->getterCallback = $getterCallback;
$this->setterCallback = $setterCallback;
}
public function __get(string $name):?string {
$name = $this->correctCamelCase($name);
$keyValuePairs = call_user_func($this->getterCallback);
return $keyValuePairs[$name] ?? null;
}
public function __set(string $name, string $value):void {
$name = $this->correctCamelCase($name);
$keyValuePairs = call_user_func($this->getterCallback);
$keyValuePairs[$name] = $value;
call_user_func($this->setterCallback, $keyValuePairs);
}
public function get(string $name):?string {
return $this->__get($name);
}
public function set(string $name, string $value):void {
$this->__set($name, $value);
}
public function count():int {
$keyValuePairs = call_user_func($this->getterCallback);
return count($keyValuePairs);
}
private function correctCamelCase(string $name):string {
preg_match_all(
'/((?:^|[A-Z])[0-9a-z\-]+)/',
$name,
$matches
);
$wordArray = [];
foreach($matches[0] as $word) {
array_push($wordArray, strtolower($word));
}
return implode("-", $wordArray);
}
}