FieldPluginBase.php

<?php

namespace Drupal\views\Plugin\views\field;

use Drupal\Component\Utility\Html;
use Drupal\Component\Render\MarkupInterface;
use Drupal\Component\Utility\Unicode;
use Drupal\Component\Utility\UrlHelper;
use Drupal\Component\Utility\Xss;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url as CoreUrl;
use Drupal\views\Plugin\views\HandlerBase;
use Drupal\views\Plugin\views\display\DisplayPluginBase;
use Drupal\views\Render\ViewsRenderPipelineMarkup;
use Drupal\views\ResultRow;
use Drupal\views\ViewExecutable;

/**
 * @defgroup views_field_handlers Views field handler plugins
 * @{
 * Handler plugins for Views fields.
 *
 * Field handlers handle both querying and display of fields in views.
 *
 * Field handler plugins extend
 * \Drupal\views\Plugin\views\field\FieldPluginBase. They must be
 * annotated with \Drupal\views\Annotation\ViewsField annotation, and they
 * must be in namespace directory Plugin\views\field.
 *
 * The following items can go into a hook_views_data() implementation in a
 * field section to affect how the field handler will behave:
 * - additional fields: An array of fields that should be added to the query.
 *   The array is in one of these forms:
 *   @code
 *   // Simple form, for fields within the same table.
 *   array('identifier' => fieldname)
 *   // Form for fields in a different table.
 *   array('identifier' => array('table' => tablename, 'field' => fieldname))
 *   @endcode
 *   As many fields as are necessary may be in this array.
 * - click sortable: If TRUE (default), this field may be click sorted.
 *
 * @ingroup views_plugins
 * @see plugin_api
 */

/**
 * Base class for views fields.
 *
 * @ingroup views_field_handlers
 */
abstract class FieldPluginBase extends HandlerBase implements FieldHandlerInterface {

  /**
   * Indicator of the renderText() method for rendering a single item.
   * (If no render_item() is present).
   */
  const RENDER_TEXT_PHASE_SINGLE_ITEM = 0;

  /**
   * Indicator of the renderText() method for rendering the whole element.
   * (if no render_item() method is available).
   */
  const RENDER_TEXT_PHASE_COMPLETELY = 1;

  /**
   * Indicator of the renderText() method for rendering the empty text.
   */
  const RENDER_TEXT_PHASE_EMPTY = 2;

  public $field_alias = 'unknown';
  public $aliases = [];

  /**
   * The field value prior to any rewriting.
   *
   * @var mixed
   */
  public $original_value = NULL;

  /**
   * Stores additional fields which get added to the query.
   *
   * The generated aliases are stored in $aliases.
   *
   * @var array
   */
  public $additional_fields = [];

  /**
   * The link generator.
   *
   * @var \Drupal\Core\Utility\LinkGeneratorInterface
   */
  protected $linkGenerator;

  /**
   * Stores the render API renderer.
   *
   * @var \Drupal\Core\Render\RendererInterface
   */
  protected $renderer;

  /**
   * Keeps track of the last render index.
   *
   * @var int|NULL
   */
  protected $lastRenderIndex;

  /**
   * {@inheritdoc}
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);

    $this->additional_fields = [];
    if (!empty($this->definition['additional fields'])) {
      $this->additional_fields = $this->definition['additional fields'];
    }

    if (!isset($this->options['exclude'])) {
      $this->options['exclude'] = '';
    }
  }

  /**
   * Determine if this field can allow advanced rendering.
   *
   * Fields can set this to FALSE if they do not wish to allow
   * token based rewriting or link-making.
   */
  protected function allowAdvancedRender() {
    return TRUE;
  }

  /**
   * Called to add the field to a query.
   */
  public function query() {
    $this->ensureMyTable();
    // Add the field.
    $params = $this->options['group_type'] != 'group' ? ['function' => $this->options['group_type']] : [];
    $this->field_alias = $this->query->addField($this->tableAlias, $this->realField, NULL, $params);

    $this->addAdditionalFields();
  }

  /**
   * Add 'additional' fields to the query.
   *
   * @param $fields
   *   An array of fields. The key is an identifier used to later find the
   *   field alias used. The value is either a string in which case it's
   *   assumed to be a field on this handler's table; or it's an array in the
   *   form of
   *   @code array('table' => $tablename, 'field' => $fieldname) @endcode
   */
  protected function addAdditionalFields($fields = NULL) {
    if (!isset($fields)) {
      // notice check
      if (empty($this->additional_fields)) {
        return;
      }
      $fields = $this->additional_fields;
    }

    $group_params = [];
    if ($this->options['group_type'] != 'group') {
      $group_params = [
        'function' => $this->options['group_type'],
      ];
    }

    if (!empty($fields) && is_array($fields)) {
      foreach ($fields as $identifier => $info) {
        if (is_array($info)) {
          if (isset($info['table'])) {
            $table_alias = $this->query->ensureTable($info['table'], $this->relationship);
          }
          else {
            $table_alias = $this->tableAlias;
          }

          if (empty($table_alias)) {
            debug(t('Handler @handler tried to add additional_field @identifier but @table could not be added!', ['@handler' => $this->definition['id'], '@identifier' => $identifier, '@table' => $info['table']]));
            $this->aliases[$identifier] = 'broken';
            continue;
          }

          $params = [];
          if (!empty($info['params'])) {
            $params = $info['params'];
          }

          $params += $group_params;
          $this->aliases[$identifier] = $this->query->addField($table_alias, $info['field'], NULL, $params);
        }
        else {
          $this->aliases[$info] = $this->query->addField($this->tableAlias, $info, NULL, $group_params);
        }
      }
    }
  }

  /**
   * {@inheritdoc}
   */
  public function clickSort($order) {
    if (isset($this->field_alias)) {
      // Since fields should always have themselves already added, just
      // add a sort on the field.
      $params = $this->options['group_type'] != 'group' ? ['function' => $this->options['group_type']] : [];
      $this->query->addOrderBy(NULL, NULL, $order, $this->field_alias, $params);
    }
  }

  /**
   * {@inheritdoc}
   */
  public function clickSortable() {
    return isset($this->definition['click sortable']) ? $this->definition['click sortable'] : TRUE;
  }

  /**
   * {@inheritdoc}
   */
  public function label() {
    if (!isset($this->options['label'])) {
      return '';
    }
    return $this->options['label'];
  }

  /**
   * {@inheritdoc}
   */
  public function elementType($none_supported = FALSE, $default_empty = FALSE, $inline = FALSE) {
    if ($none_supported) {
      if ($this->options['element_type'] === '0') {
        return '';
      }
    }
    if ($this->options['element_type']) {
      return $this->options['element_type'];
    }

    if ($default_empty) {
      return '';
    }

    if ($inline) {
      return 'span';
    }

    if (isset($this->definition['element type'])) {
      return $this->definition['element type'];
    }

    return 'span';
  }

  /**
   * {@inheritdoc}
   */
  public function elementLabelType($none_supported = FALSE, $default_empty = FALSE) {
    if ($none_supported) {
      if ($this->options['element_label_type'] === '0') {
        return '';
      }
    }
    if ($this->options['element_label_type']) {
      return $this->options['element_label_type'];
    }

    if ($default_empty) {
      return '';
    }

    return 'span';
  }

  /**
   * {@inheritdoc}
   */
  public function elementWrapperType($none_supported = FALSE, $default_empty = FALSE) {
    if ($none_supported) {
      if ($this->options['element_wrapper_type'] === '0') {
        return 0;
      }
    }
    if ($this->options['element_wrapper_type']) {
      return $this->options['element_wrapper_type'];
    }

    if ($default_empty) {
      return '';
    }

    return 'div';
  }

  /**
   * {@inheritdoc}
   */
  public function getElements() {
    static $elements = NULL;
    if (!isset($elements)) {
      // @todo Add possible html5 elements.
      $elements = [
        '' => $this->t('- Use default -'),
        '0' => $this->t('- None -')
      ];
      $elements += \Drupal::config('views.settings')->get('field_rewrite_elements');
    }

    return $elements;
  }

  /**
   * {@inheritdoc}
   */
  public function elementClasses($row_index = NULL) {
    $classes = $this->tokenizeValue($this->options['element_class'], $row_index);
    $classes = explode(' ', $classes);
    foreach ($classes as &$class) {
      $class = Html::cleanCssIdentifier($class);
    }
    return implode(' ', $classes);
  }

  /**
   * {@inheritdoc}
   */
  public function tokenizeValue($value, $row_index = NULL) {
    if (strpos($value, '{{') !== FALSE) {
      $fake_item = [
        'alter_text' => TRUE,
        'text' => $value,
      ];

      // Use isset() because empty() will trigger on 0 and 0 is
      // the first row.
      if (isset($row_index) && isset($this->view->style_plugin->render_tokens[$row_index])) {
        $tokens = $this->view->style_plugin->render_tokens[$row_index];
      }
      else {
        // Get tokens from the last field.
        $last_field = end($this->view->field);
        if (isset($last_field->last_tokens)) {
          $tokens = $last_field->last_tokens;
        }
        else {
          $tokens = $last_field->getRenderTokens($fake_item);
        }
      }

      $value = strip_tags($this->renderAltered($fake_item, $tokens));
      if (!empty($this->options['alter']['trim_whitespace'])) {
        $value = trim($value);
      }
    }

    return $value;
  }

  /**
   * {@inheritdoc}
   */
  public function elementLabelClasses($row_index = NULL) {
    $classes = $this->tokenizeValue($this->options['element_label_class'], $row_index);
    $classes = explode(' ', $classes);
    foreach ($classes as &$class) {
      $class = Html::cleanCssIdentifier($class);
    }
    return implode(' ', $classes);
  }

  /**
   * {@inheritdoc}
   */
  public function elementWrapperClasses($row_index = NULL) {
    $classes = $this->tokenizeValue($this->options['element_wrapper_class'], $row_index);
    $classes = explode(' ', $classes);
    foreach ($classes as &$class) {
      $class = Html::cleanCssIdentifier($class);
    }
    return implode(' ', $classes);
  }

  /**
   * {@inheritdoc}
   */
  public function getEntity(ResultRow $values) {
    $relationship_id = $this->options['relationship'];
    if ($relationship_id == 'none') {
      return $values->_entity;
    }
    elseif (isset($values->_relationship_entities[$relationship_id])) {
      return $values->_relationship_entities[$relationship_id];
    }
  }

  /**
   * {@inheritdoc}
   */
  public function getValue(ResultRow $values, $field = NULL) {
    $alias = isset($field) ? $this->aliases[$field] : $this->field_alias;
    if (isset($values->{$alias})) {
      return $values->{$alias};
    }
  }

  /**
   * {@inheritdoc}
   */
  public function useStringGroupBy() {
    return TRUE;
  }

  protected function defineOptions() {
    $options = parent::defineOptions();

    $options['label'] = ['default' => ''];
    // Some styles (for example table) should have labels enabled by default.
    $style = $this->view->getStyle();
    if (isset($style) && $style->defaultFieldLabels()) {
      $options['label']['default'] = $this->definition['title'];
    }

    $options['exclude'] = ['default' => FALSE];
    $options['alter'] = [
      'contains' => [
        'alter_text' => ['default' => FALSE],
        'text' => ['default' => ''],
        'make_link' => ['default' => FALSE],
        'path' => ['default' => ''],
        'absolute' => ['default' => FALSE],
        'external' => ['default' => FALSE],
        'replace_spaces' => ['default' => FALSE],
        'path_case' => ['default' => 'none'],
        'trim_whitespace' => ['default' => FALSE],
        'alt' => ['default' => ''],
        'rel' => ['default' => ''],
        'link_class' => ['default' => ''],
        'prefix' => ['default' => ''],
        'suffix' => ['default' => ''],
        'target' => ['default' => ''],
        'nl2br' => ['default' => FALSE],
        'max_length' => ['default' => 0],
        'word_boundary' => ['default' => TRUE],
        'ellipsis' => ['default' => TRUE],
        'more_link' => ['default' => FALSE],
        'more_link_text' => ['default' => ''],
        'more_link_path' => ['default' => ''],
        'strip_tags' => ['default' => FALSE],
        'trim' => ['default' => FALSE],
        'preserve_tags' => ['default' => ''],
        'html' => ['default' => FALSE],
      ],
    ];
    $options['element_type'] = ['default' => ''];
    $options['element_class'] = ['default' => ''];

    $options['element_label_type'] = ['default' => ''];
    $options['element_label_class'] = ['default' => ''];
    $options['element_label_colon'] = ['default' => TRUE];

    $options['element_wrapper_type'] = ['default' => ''];
    $options['element_wrapper_class'] = ['default' => ''];

    $options['element_default_classes'] = ['default' => TRUE];

    $options['empty'] = ['default' => ''];
    $options['hide_empty'] = ['default' => FALSE];
    $options['empty_zero'] = ['default' => FALSE];
    $options['hide_alter_empty'] = ['default' => TRUE];

    return $options;
  }

  /**
   * Performs some cleanup tasks on the options array before saving it.
   */
  public function submitOptionsForm(&$form, FormStateInterface $form_state) {
    $options = &$form_state->getValue('options');
    $types = ['element_type', 'element_label_type', 'element_wrapper_type'];
    $classes = array_combine(['element_class', 'element_label_class', 'element_wrapper_class'], $types);

    foreach ($types as $type) {
      if (!$options[$type . '_enable']) {
        $options[$type] = '';
      }
    }

    foreach ($classes as $class => $type) {
      if (!$options[$class . '_enable'] || !$options[$type . '_enable']) {
        $options[$class] = '';
      }
    }

    if (empty($options['custom_label'])) {
      $options['label'] = '';
      $options['element_label_colon'] = FALSE;
    }
  }

  /**
   * Default options form that provides the label widget that all fields
   * should have.
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    parent::buildOptionsForm($form, $form_state);

    $label = $this->label();
    $form['custom_label'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Create a label'),
      '#default_value' => $label !== '',
      '#weight' => -103,
    ];
    $form['label'] = [
      '#type' => 'textfield',
      '#title' => $this->t('Label'),
      '#default_value' => $label,
      '#states' => [
        'visible' => [
          ':input[name="options[custom_label]"]' => ['checked' => TRUE],
        ],
      ],
      '#weight' => -102,
    ];
    $form['element_label_colon'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Place a colon after the label'),
      '#default_value' => $this->options['element_label_colon'],
      '#states' => [
        'visible' => [
          ':input[name="options[custom_label]"]' => ['checked' => TRUE],
        ],
      ],
      '#weight' => -101,
    ];

    $form['exclude'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Exclude from display'),
      '#default_value' => $this->options['exclude'],
      '#description' => $this->t('Enable to load this field as hidden. Often used to group fields, or to use as token in another field.'),
      '#weight' => -100,
    ];

    $form['style_settings'] = [
      '#type' => 'details',
      '#title' => $this->t('Style settings'),
      '#weight' => 99,
    ];

    $form['element_type_enable'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Customize field HTML'),
      '#default_value' => !empty($this->options['element_type']) || (string) $this->options['element_type'] == '0' || !empty($this->options['element_class']) || (string) $this->options['element_class'] == '0',
      '#fieldset' => 'style_settings',
    ];
    $form['element_type'] = [
      '#title' => $this->t('HTML element'),
      '#options' => $this->getElements(),
      '#type' => 'select',
      '#default_value' => $this->options['element_type'],
      '#description' => $this->t('Choose the HTML element to wrap around this field, e.g. H1, H2, etc.'),
      '#states' => [
        'visible' => [
          ':input[name="options[element_type_enable]"]' => ['checked' => TRUE],
        ],
      ],
      '#fieldset' => 'style_settings',
    ];

    $form['element_class_enable'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Create a CSS class'),
      '#states' => [
        'visible' => [
          ':input[name="options[element_type_enable]"]' => ['checked' => TRUE],
        ],
      ],
      '#default_value' => !empty($this->options['element_class']) || (string) $this->options['element_class'] == '0',
      '#fieldset' => 'style_settings',
    ];
    $form['element_class'] = [
      '#title' => $this->t('CSS class'),
      '#description' => $this->t('You may use token substitutions from the rewriting section in this class.'),
      '#type' => 'textfield',
      '#default_value' => $this->options['element_class'],
      '#states' => [
        'visible' => [
          ':input[name="options[element_type_enable]"]' => ['checked' => TRUE],
          ':input[name="options[element_class_enable]"]' => ['checked' => TRUE],
        ],
      ],
      '#fieldset' => 'style_settings',
    ];

    $form['element_label_type_enable'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Customize label HTML'),
      '#default_value' => !empty($this->options['element_label_type']) || (string) $this->options['element_label_type'] == '0' || !empty($this->options['element_label_class']) || (string) $this->options['element_label_class'] == '0',
      '#fieldset' => 'style_settings',
    ];
    $form['element_label_type'] = [
      '#title' => $this->t('Label HTML element'),
      '#options' => $this->getElements(FALSE),
      '#type' => 'select',
      '#default_value' => $this->options['element_label_type'],
      '#description' => $this->t('Choose the HTML element to wrap around this label, e.g. H1, H2, etc.'),
      '#states' => [
        'visible' => [
          ':input[name="options[element_label_type_enable]"]' => ['checked' => TRUE],
        ],
      ],
      '#fieldset' => 'style_settings',
    ];
    $form['element_label_class_enable'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Create a CSS class'),
      '#states' => [
        'visible' => [
          ':input[name="options[element_label_type_enable]"]' => ['checked' => TRUE],
        ],
      ],
      '#default_value' => !empty($this->options['element_label_class']) || (string) $this->options['element_label_class'] == '0',
      '#fieldset' => 'style_settings',
    ];
    $form['element_label_class'] = [
      '#title' => $this->t('CSS class'),
      '#description' => $this->t('You may use token substitutions from the rewriting section in this class.'),
      '#type' => 'textfield',
      '#default_value' => $this->options['element_label_class'],
      '#states' => [
        'visible' => [
          ':input[name="options[element_label_type_enable]"]' => ['checked' => TRUE],
          ':input[name="options[element_label_class_enable]"]' => ['checked' => TRUE],
        ],
      ],
      '#fieldset' => 'style_settings',
    ];

    $form['element_wrapper_type_enable'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Customize field and label wrapper HTML'),
      '#default_value' => !empty($this->options['element_wrapper_type']) || (string) $this->options['element_wrapper_type'] == '0' || !empty($this->options['element_wrapper_class']) || (string) $this->options['element_wrapper_class'] == '0',
      '#fieldset' => 'style_settings',
    ];
    $form['element_wrapper_type'] = [
      '#title' => $this->t('Wrapper HTML element'),
      '#options' => $this->getElements(FALSE),
      '#type' => 'select',
      '#default_value' => $this->options['element_wrapper_type'],
      '#description' => $this->t('Choose the HTML element to wrap around this field and label, e.g. H1, H2, etc. This may not be used if the field and label are not rendered together, such as with a table.'),
      '#states' => [
        'visible' => [
          ':input[name="options[element_wrapper_type_enable]"]' => ['checked' => TRUE],
        ],
      ],
      '#fieldset' => 'style_settings',
    ];

    $form['element_wrapper_class_enable'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Create a CSS class'),
      '#states' => [
        'visible' => [
          ':input[name="options[element_wrapper_type_enable]"]' => ['checked' => TRUE],
        ],
      ],
      '#default_value' => !empty($this->options['element_wrapper_class']) || (string) $this->options['element_wrapper_class'] == '0',
      '#fieldset' => 'style_settings',
    ];
    $form['element_wrapper_class'] = [
      '#title' => $this->t('CSS class'),
      '#description' => $this->t('You may use token substitutions from the rewriting section in this class.'),
      '#type' => 'textfield',
      '#default_value' => $this->options['element_wrapper_class'],
      '#states' => [
        'visible' => [
          ':input[name="options[element_wrapper_class_enable]"]' => ['checked' => TRUE],
          ':input[name="options[element_wrapper_type_enable]"]' => ['checked' => TRUE],
        ],
      ],
      '#fieldset' => 'style_settings',
    ];

    $form['element_default_classes'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Add default classes'),
      '#default_value' => $this->options['element_default_classes'],
      '#description' => $this->t('Use default Views classes to identify the field, field label and field content.'),
      '#fieldset' => 'style_settings',
    ];

    $form['alter'] = [
      '#title' => $this->t('Rewrite results'),
      '#type' => 'details',
      '#weight' => 100,
    ];

    if ($this->allowAdvancedRender()) {
      $form['alter']['#tree'] = TRUE;
      $form['alter']['alter_text'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('Override the output of this field with custom text'),
        '#default_value' => $this->options['alter']['alter_text'],
      ];

      $form['alter']['text'] = [
        '#title' => $this->t('Text'),
        '#type' => 'textarea',
        '#default_value' => $this->options['alter']['text'],
        '#description' => $this->t('The text to display for this field. You may include HTML or <a href=":url">Twig</a>. You may enter data from this view as per the "Replacement patterns" below.', [':url' => CoreUrl::fromUri('http://twig.sensiolabs.org/documentation')->toString()]),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][alter_text]"]' => ['checked' => TRUE],
          ],
        ],
      ];

      $form['alter']['make_link'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('Output this field as a custom link'),
        '#default_value' => $this->options['alter']['make_link'],
      ];
      $form['alter']['path'] = [
        '#title' => $this->t('Link path'),
        '#type' => 'textfield',
        '#default_value' => $this->options['alter']['path'],
        '#description' => $this->t('The Drupal path or absolute URL for this link. You may enter data from this view as per the "Replacement patterns" below.'),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
        '#maxlength' => 255,
      ];
      $form['alter']['absolute'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('Use absolute path'),
        '#default_value' => $this->options['alter']['absolute'],
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];
      $form['alter']['replace_spaces'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('Replace spaces with dashes'),
        '#default_value' => $this->options['alter']['replace_spaces'],
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];
      $form['alter']['external'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('External server URL'),
        '#default_value' => $this->options['alter']['external'],
        '#description' => $this->t("Links to an external server using a full URL: e.g. 'http://www.example.com' or 'www.example.com'."),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];
      $form['alter']['path_case'] = [
        '#type' => 'select',
        '#title' => $this->t('Transform the case'),
        '#description' => $this->t('When printing URL paths, how to transform the case of the filter value.'),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
        '#options' => [
          'none' => $this->t('No transform'),
          'upper' => $this->t('Upper case'),
          'lower' => $this->t('Lower case'),
          'ucfirst' => $this->t('Capitalize first letter'),
          'ucwords' => $this->t('Capitalize each word'),
        ],
        '#default_value' => $this->options['alter']['path_case'],
      ];
      $form['alter']['link_class'] = [
        '#title' => $this->t('Link class'),
        '#type' => 'textfield',
        '#default_value' => $this->options['alter']['link_class'],
        '#description' => $this->t('The CSS class to apply to the link.'),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];
      $form['alter']['alt'] = [
        '#title' => $this->t('Title text'),
        '#type' => 'textfield',
        '#default_value' => $this->options['alter']['alt'],
        '#description' => $this->t('Text to place as "title" text which most browsers display as a tooltip when hovering over the link.'),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];
      $form['alter']['rel'] = [
        '#title' => $this->t('Rel Text'),
        '#type' => 'textfield',
        '#default_value' => $this->options['alter']['rel'],
        '#description' => $this->t('Include Rel attribute for use in lightbox2 or other javascript utility.'),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];
      $form['alter']['prefix'] = [
        '#title' => $this->t('Prefix text'),
        '#type' => 'textfield',
        '#default_value' => $this->options['alter']['prefix'],
        '#description' => $this->t('Any text to display before this link. You may include HTML.'),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];
      $form['alter']['suffix'] = [
        '#title' => $this->t('Suffix text'),
        '#type' => 'textfield',
        '#default_value' => $this->options['alter']['suffix'],
        '#description' => $this->t('Any text to display after this link. You may include HTML.'),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];
      $form['alter']['target'] = [
        '#title' => $this->t('Target'),
        '#type' => 'textfield',
        '#default_value' => $this->options['alter']['target'],
        '#description' => $this->t("Target of the link, such as _blank, _parent or an iframe's name. This field is rarely used."),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];

      // Get a list of the available fields and arguments for token replacement.

      // Setup the tokens for fields.
      $previous = $this->getPreviousFieldLabels();
      $optgroup_arguments = (string) t('Arguments');
      $optgroup_fields = (string) t('Fields');
      foreach ($previous as $id => $label) {
        $options[$optgroup_fields]["{{ $id }}"] = substr(strrchr($label, ":"), 2);
      }
      // Add the field to the list of options.
      $options[$optgroup_fields]["{{ {$this->options['id']} }}"] = substr(strrchr($this->adminLabel(), ":"), 2);

      foreach ($this->view->display_handler->getHandlers('argument') as $arg => $handler) {
        $options[$optgroup_arguments]["{{ arguments.$arg }}"] = $this->t('@argument title', ['@argument' => $handler->adminLabel()]);
        $options[$optgroup_arguments]["{{ raw_arguments.$arg }}"] = $this->t('@argument input', ['@argument' => $handler->adminLabel()]);
      }

      $this->documentSelfTokens($options[$optgroup_fields]);

      // Default text.

      $output = [];
      $output[] = [
        '#markup' => '<p>' . $this->t('You must add some additional fields to this display before using this field. These fields may be marked as <em>Exclude from display</em> if you prefer. Note that due to rendering order, you cannot use fields that come after this field; if you need a field not listed here, rearrange your fields.') . '</p>',
      ];
      // We have some options, so make a list.
      if (!empty($options)) {
        $output[] = [
          '#markup' => '<p>' . $this->t("The following replacement tokens are available for this field. Note that due to rendering order, you cannot use fields that come after this field; if you need a field not listed here, rearrange your fields.") . '</p>',
        ];
        foreach (array_keys($options) as $type) {
          if (!empty($options[$type])) {
            $items = [];
            foreach ($options[$type] as $key => $value) {
              $items[] = $key . ' == ' . $value;
            }
            $item_list = [
              '#theme' => 'item_list',
              '#items' => $items,
            ];
            $output[] = $item_list;
          }
        }
      }
      // This construct uses 'hidden' and not markup because process doesn't
      // run. It also has an extra div because the dependency wants to hide
      // the parent in situations like this, so we need a second div to
      // make this work.
      $form['alter']['help'] = [
        '#type' => 'details',
        '#title' => $this->t('Replacement patterns'),
        '#value' => $output,
        '#states' => [
          'visible' => [
            [
              ':input[name="options[alter][make_link]"]' => ['checked' => TRUE],
            ],
            [
              ':input[name="options[alter][alter_text]"]' => ['checked' => TRUE],
            ],
            [
              ':input[name="options[alter][more_link]"]' => ['checked' => TRUE],
            ],
          ],
        ],
      ];

      $form['alter']['trim'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('Trim this field to a maximum number of characters'),
        '#default_value' => $this->options['alter']['trim'],
      ];

      $form['alter']['max_length'] = [
        '#title' => $this->t('Maximum number of characters'),
        '#type' => 'textfield',
        '#default_value' => $this->options['alter']['max_length'],
        '#states' => [
          'visible' => [
            ':input[name="options[alter][trim]"]' => ['checked' => TRUE],
          ],
        ],
      ];

      $form['alter']['word_boundary'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('Trim only on a word boundary'),
        '#description' => $this->t('If checked, this field be trimmed only on a word boundary. This is guaranteed to be the maximum characters stated or less. If there are no word boundaries this could trim a field to nothing.'),
        '#default_value' => $this->options['alter']['word_boundary'],
        '#states' => [
          'visible' => [
            ':input[name="options[alter][trim]"]' => ['checked' => TRUE],
          ],
        ],
      ];

      $form['alter']['ellipsis'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('Add "…" at the end of trimmed text'),
        '#default_value' => $this->options['alter']['ellipsis'],
        '#states' => [
          'visible' => [
            ':input[name="options[alter][trim]"]' => ['checked' => TRUE],
          ],
        ],
      ];

      $form['alter']['more_link'] = [
        '#type' => 'checkbox',
        '#title' => $this->t('Add a read-more link if output is trimmed'),
        '#default_value' => $this->options['alter']['more_link'],
        '#states' => [
          'visible' => [
            ':input[name="options[alter][trim]"]' => ['checked' => TRUE],
          ],
        ],
      ];

      $form['alter']['more_link_text'] = [
        '#type' => 'textfield',
        '#title' => $this->t('More link label'),
        '#default_value' => $this->options['alter']['more_link_text'],
        '#description' => $this->t('You may use the "Replacement patterns" above.'),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][trim]"]' => ['checked' => TRUE],
            ':input[name="options[alter][more_link]"]' => ['checked' => TRUE],
          ],
        ],
      ];
      $form['alter']['more_link_path'] = [
        '#type' => 'textfield',
        '#title' => $this->t('More link path'),
        '#default_value' => $this->options['alter']['more_link_path'],
        '#description' => $this->t('This can be an internal Drupal path such as node/add or an external URL such as "https://www.drupal.org". You may use the "Replacement patterns" above.'),
        '#states' => [
          'visible' => [
            ':input[name="options[alter][trim]"]' => ['checked' => TRUE],
            ':input[name="options[alter][more_link]"]' => ['checked' => TRUE],
          ],
        ],