Move into nested docroot

web/core/modules/telephone/src/Plugin/Field/FieldFormatter/TelephoneLinkFormatter.php

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+<?php
+
+namespace Drupal\telephone\Plugin\Field\FieldFormatter;
+
+use Drupal\Core\Field\FormatterBase;
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Plugin implementation of the 'telephone_link' formatter.
+ *
+ * @FieldFormatter(
+ *   id = "telephone_link",
+ *   label = @Translation("Telephone link"),
+ *   field_types = {
+ *     "telephone"
+ *   }
+ * )
+ */
+class TelephoneLinkFormatter extends FormatterBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultSettings() {
+    return array(
+      'title' => '',
+    ) + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, FormStateInterface $form_state) {
+    $elements['title'] = array(
+      '#type' => 'textfield',
+      '#title' => t('Title to replace basic numeric telephone number display'),
+      '#default_value' => $this->getSetting('title'),
+    );
+
+    return $elements;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsSummary() {
+    $summary = array();
+    $settings = $this->getSettings();
+
+    if (!empty($settings['title'])) {
+      $summary[] = t('Link using text: @title', array('@title' => $settings['title']));
+    }
+    else {
+      $summary[] = t('Link using provided telephone number.');
+    }
+
+    return $summary;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function viewElements(FieldItemListInterface $items, $langcode) {
+    $element = array();
+    $title_setting = $this->getSetting('title');
+
+    foreach ($items as $delta => $item) {
+      // Render each element as link.
+      $element[$delta] = array(
+        '#type' => 'link',
+        // Use custom title if available, otherwise use the telephone number
+        // itself as title.
+        '#title' => $title_setting ?: $item->value,
+        // Prepend 'tel:' to the telephone number.
+        '#url' => Url::fromUri('tel:' . rawurlencode(preg_replace('/\s+/', '', $item->value))),
+        '#options' => array('external' => TRUE),
+      );
+
+      if (!empty($item->_attributes)) {
+        $element[$delta]['#options'] += array('attributes' => array());
+        $element[$delta]['#options']['attributes'] += $item->_attributes;
+        // Unset field item attributes since they have been included in the
+        // formatter output and should not be rendered in the field template.
+        unset($item->_attributes);
+      }
+    }
+
+    return $element;
+  }
+
+}

web/core/modules/telephone/src/Plugin/Field/FieldType/TelephoneItem.php

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+<?php
+
+namespace Drupal\telephone\Plugin\Field\FieldType;
+
+use Drupal\Core\Field\FieldDefinitionInterface;
+use Drupal\Core\Field\FieldItemBase;
+use Drupal\Core\Field\FieldStorageDefinitionInterface;
+use Drupal\Core\TypedData\DataDefinition;
+
+/**
+ * Plugin implementation of the 'telephone' field type.
+ *
+ * @FieldType(
+ *   id = "telephone",
+ *   label = @Translation("Telephone number"),
+ *   description = @Translation("This field stores a telephone number in the database."),
+ *   category = @Translation("Number"),
+ *   default_widget = "telephone_default",
+ *   default_formatter = "basic_string"
+ * )
+ */
+class TelephoneItem extends FieldItemBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function schema(FieldStorageDefinitionInterface $field_definition) {
+    return array(
+      'columns' => array(
+        'value' => array(
+          'type' => 'varchar',
+          'length' => 256,
+        ),
+      ),
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function propertyDefinitions(FieldStorageDefinitionInterface $field_definition) {
+    $properties['value'] = DataDefinition::create('string')
+      ->setLabel(t('Telephone number'))
+      ->setRequired(TRUE);
+
+    return $properties;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isEmpty() {
+    $value = $this->get('value')->getValue();
+    return $value === NULL || $value === '';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConstraints() {
+    $constraint_manager = \Drupal::typedDataManager()->getValidationConstraintManager();
+    $constraints = parent::getConstraints();
+
+    $max_length = 256;
+    $constraints[] = $constraint_manager->create('ComplexData', array(
+      'value' => array(
+        'Length' => array(
+          'max' => $max_length,
+          'maxMessage' => t('%name: the telephone number may not be longer than @max characters.', array('%name' => $this->getFieldDefinition()->getLabel(), '@max' => $max_length)),
+        )
+      ),
+    ));
+
+    return $constraints;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
+    $values['value'] = rand(pow(10, 8), pow(10, 9) - 1);
+    return $values;
+  }
+
+}

web/core/modules/telephone/src/Plugin/Field/FieldWidget/TelephoneDefaultWidget.php

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+<?php
+
+namespace Drupal\telephone\Plugin\Field\FieldWidget;
+
+use Drupal\Core\Field\FieldItemListInterface;
+use Drupal\Core\Field\WidgetBase;
+use Drupal\Core\Form\FormStateInterface;
+
+/**
+ * Plugin implementation of the 'telephone_default' widget.
+ *
+ * @FieldWidget(
+ *   id = "telephone_default",
+ *   label = @Translation("Telephone number"),
+ *   field_types = {
+ *     "telephone"
+ *   }
+ * )
+ */
+class TelephoneDefaultWidget extends WidgetBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultSettings() {
+    return array(
+      'placeholder' => '',
+    ) + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsForm(array $form, FormStateInterface $form_state) {
+    $element['placeholder'] = array(
+      '#type' => 'textfield',
+      '#title' => t('Placeholder'),
+      '#default_value' => $this->getSetting('placeholder'),
+      '#description' => t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
+    );
+    return $element;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function settingsSummary() {
+    $summary = array();
+
+    $placeholder = $this->getSetting('placeholder');
+    if (!empty($placeholder)) {
+      $summary[] = t('Placeholder: @placeholder', array('@placeholder' => $placeholder));
+    }
+    else {
+      $summary[] = t('No placeholder');
+    }
+
+    return $summary;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
+    $element['value'] = $element + array(
+      '#type' => 'tel',
+      '#default_value' => isset($items[$delta]->value) ? $items[$delta]->value : NULL,
+      '#placeholder' => $this->getSetting('placeholder'),
+    );
+    return $element;
+  }
+
+}