--- /dev/null
+<?php
+
+namespace Drupal\Core\Render\Element;
+
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Render\Element;
+
+/**
+ * Provides a one-line text field form element.
+ *
+ * Properties:
+ * - #maxlength: Maximum number of characters of input allowed.
+ * - #size: The size of the input element in characters.
+ * - #autocomplete_route_name: A route to be used as callback URL by the
+ * autocomplete JavaScript library.
+ * - #autocomplete_route_parameters: An array of parameters to be used in
+ * conjunction with the route name.
+ *
+ * Usage example:
+ * @code
+ * $form['title'] = array(
+ * '#type' => 'textfield',
+ * '#title' => $this->t('Subject'),
+ * '#default_value' => $node->title,
+ * '#size' => 60,
+ * '#maxlength' => 128,
+ * '#required' => TRUE,
+ * );
+ * @endcode
+ *
+ * @see \Drupal\Core\Render\Element\Color
+ * @see \Drupal\Core\Render\Element\Email
+ * @see \Drupal\Core\Render\Element\MachineName
+ * @see \Drupal\Core\Render\Element\Number
+ * @see \Drupal\Core\Render\Element\Password
+ * @see \Drupal\Core\Render\Element\PasswordConfirm
+ * @see \Drupal\Core\Render\Element\Range
+ * @see \Drupal\Core\Render\Element\Tel
+ * @see \Drupal\Core\Render\Element\Url
+ *
+ * @FormElement("textfield")
+ */
+class Textfield extends FormElement {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getInfo() {
+ $class = get_class($this);
+ return [
+ '#input' => TRUE,
+ '#size' => 60,
+ '#maxlength' => 128,
+ '#autocomplete_route_name' => FALSE,
+ '#process' => [
+ [$class, 'processAutocomplete'],
+ [$class, 'processAjaxForm'],
+ [$class, 'processPattern'],
+ [$class, 'processGroup'],
+ ],
+ '#pre_render' => [
+ [$class, 'preRenderTextfield'],
+ [$class, 'preRenderGroup'],
+ ],
+ '#theme' => 'input__textfield',
+ '#theme_wrappers' => ['form_element'],
+ ];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public static function valueCallback(&$element, $input, FormStateInterface $form_state) {
+ if ($input !== FALSE && $input !== NULL) {
+ // This should be a string, but allow other scalars since they might be
+ // valid input in programmatic form submissions.
+ if (!is_scalar($input)) {
+ $input = '';
+ }
+ return str_replace(["\r", "\n"], '', $input);
+ }
+ return NULL;
+ }
+
+ /**
+ * Prepares a #type 'textfield' render element for input.html.twig.
+ *
+ * @param array $element
+ * An associative array containing the properties of the element.
+ * Properties used: #title, #value, #description, #size, #maxlength,
+ * #placeholder, #required, #attributes.
+ *
+ * @return array
+ * The $element with prepared variables ready for input.html.twig.
+ */
+ public static function preRenderTextfield($element) {
+ $element['#attributes']['type'] = 'text';
+ Element::setAttributes($element, ['id', 'name', 'value', 'size', 'maxlength', 'placeholder']);
+ static::setAttributes($element, ['form-text']);
+
+ return $element;
+ }
+
+}