Chris@0: <?php
Chris@0: 
Chris@0: namespace Drupal\Core\Template;
Chris@0: 
Chris@0: use Drupal\Component\Utility\Html;
Chris@0: 
Chris@0: /**
Chris@0:  * A class that defines a type of boolean HTML attribute.
Chris@0:  *
Chris@0:  * Boolean HTML attributes are not attributes with values of TRUE/FALSE.
Chris@0:  * They are attributes that if they exist in the tag, they are TRUE.
Chris@0:  * Examples include selected, disabled, checked, readonly.
Chris@0:  *
Chris@0:  * To set a boolean attribute on the Attribute class, set it to TRUE.
Chris@0:  * @code
Chris@0:  *  $attributes = new Attribute();
Chris@0:  *  $attributes['disabled'] = TRUE;
Chris@0:  *  echo '<select' . $attributes . '/>';
Chris@0:  *  // produces <select disabled>;
Chris@0:  *  $attributes['disabled'] = FALSE;
Chris@0:  *  echo '<select' . $attributes . '/>';
Chris@0:  *  // produces <select>;
Chris@0:  * @endcode
Chris@0:  *
Chris@0:  * @see \Drupal\Core\Template\Attribute
Chris@0:  */
Chris@0: class AttributeBoolean extends AttributeValueBase {
Chris@0: 
Chris@0:   /**
Chris@0:    * {@inheritdoc}
Chris@0:    */
Chris@0:   public function render() {
Chris@0:     return $this->__toString();
Chris@0:   }
Chris@0: 
Chris@0:   /**
Chris@0:    * Implements the magic __toString() method.
Chris@0:    */
Chris@0:   public function __toString() {
Chris@0:     return $this->value === FALSE ? '' : Html::escape($this->name);
Chris@0:   }
Chris@0: 
Chris@0: }