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abstract class AttributeValueBase in Drupal 9

Same name and namespace in other branches
  1. 8 core/lib/Drupal/Core/Template/AttributeValueBase.php \Drupal\Core\Template\AttributeValueBase
  2. 10 core/lib/Drupal/Core/Template/AttributeValueBase.php \Drupal\Core\Template\AttributeValueBase

Defines the base class for an attribute type.

Hierarchy

Expanded class hierarchy of AttributeValueBase

See also

\Drupal\Core\Template\Attribute

File

core/lib/Drupal/Core/Template/AttributeValueBase.php, line 12

Namespace

Drupal\Core\Template
View source
abstract class AttributeValueBase {

  /**
   * Renders '$name=""' if $value is an empty string.
   *
   * @see \Drupal\Core\Template\AttributeValueBase::render()
   */
  const RENDER_EMPTY_ATTRIBUTE = TRUE;

  /**
   * The value itself.
   *
   * @var mixed
   */
  protected $value;

  /**
   * The name of the value.
   *
   * @var mixed
   */
  protected $name;

  /**
   * Constructs a \Drupal\Core\Template\AttributeValueBase object.
   */
  public function __construct($name, $value) {
    $this->name = $name;
    $this->value = $value;
  }

  /**
   * Returns a string representation of the attribute.
   *
   * While __toString only returns the value in a string form, render()
   * contains the name of the attribute as well.
   *
   * @return string
   *   The string representation of the attribute.
   */
  public function render() {
    $value = (string) $this;
    if (isset($this->value) && static::RENDER_EMPTY_ATTRIBUTE || !empty($value)) {
      return Html::escape($this->name) . '="' . $value . '"';
    }
  }

  /**
   * Returns the raw value.
   */
  public function value() {
    return $this->value;
  }

  /**
   * Implements the magic __toString() method.
   */
  public abstract function __toString();

}

Members

Namesort descending Modifiers Type Description Overrides
AttributeValueBase::$name protected property The name of the value.
AttributeValueBase::$value protected property The value itself.
AttributeValueBase::render public function Returns a string representation of the attribute. 1
AttributeValueBase::RENDER_EMPTY_ATTRIBUTE constant Renders '$name=""' if $value is an empty string. 1
AttributeValueBase::value public function Returns the raw value.
AttributeValueBase::__construct public function Constructs a \Drupal\Core\Template\AttributeValueBase object.
AttributeValueBase::__toString abstract public function Implements the magic __toString() method. 3