diff core/lib/Drupal/Core/Template/AttributeBoolean.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/Template/AttributeBoolean.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,43 @@
+<?php
+
+namespace Drupal\Core\Template;
+
+use Drupal\Component\Utility\Html;
+
+/**
+ * A class that defines a type of boolean HTML attribute.
+ *
+ * Boolean HTML attributes are not attributes with values of TRUE/FALSE.
+ * They are attributes that if they exist in the tag, they are TRUE.
+ * Examples include selected, disabled, checked, readonly.
+ *
+ * To set a boolean attribute on the Attribute class, set it to TRUE.
+ * @code
+ *  $attributes = new Attribute();
+ *  $attributes['disabled'] = TRUE;
+ *  echo '<select' . $attributes . '/>';
+ *  // produces <select disabled>;
+ *  $attributes['disabled'] = FALSE;
+ *  echo '<select' . $attributes . '/>';
+ *  // produces <select>;
+ * @endcode
+ *
+ * @see \Drupal\Core\Template\Attribute
+ */
+class AttributeBoolean extends AttributeValueBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function render() {
+    return $this->__toString();
+  }
+
+  /**
+   * Implements the magic __toString() method.
+   */
+  public function __toString() {
+    return $this->value === FALSE ? '' : Html::escape($this->name);
+  }
+
+}