viewfield.module

<?php

use \Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;

/**
 * @file
 * Defines a field type to display a view.
 */

/**
 * Implements hook_theme().
 */
function viewfield_theme() {
  return array(
    'viewfield_formatter_default' => array(
      'render element' => 'element',
    ),
  );
}

/**
 * Implements hook_preprocess_HOOK().
 */
function viewfield_preprocess_viewfield_formatter_default(&$variables) {
  $element = $variables['element'];
  $view_el = $element['#view']->preview($element['#view_display'], array($element['#view_arguments']));
  $output = render ($view_el);
  $variables['output'] = $output;
}

/**
 * Implements hook_element_info().
 */
function viewfield_element_info() {
  $types['viewfield'] = array(
    '#pre_render' => array('viewfield_pre_render'),
    '#theme' => 'viewfield_formatter_default',
    '#post_render' => array('viewfield_post_render'),
  );
  return $types;
}

/**
 * #pre_render callback for a viewfield field.
 *
 * @see viewfield_post_render()
 */
function viewfield_pre_render($element) {
  $stack = &drupal_static('viewfield_stack', array());

  // Abort rendering in case the view could not be loaded.
  if (empty($element['#view'])) {
    // @todo Output an error message?
    $element['#printed'] = TRUE;
  }
  // Abort rendering in case of recursion.
  elseif (isset($stack[$element['#entity_type']][$element['#entity_id']])) {
    $element['#printed'] = TRUE;
  }
  // Otherwise, add the rendered entity to the stack to prevent recursion.
  else {
    $stack[$element['#entity_type']][$element['#entity_id']] = TRUE;

    // Override the view's path to the current path. Otherwise, exposed
    // views filters would submit to the front page.
    $url = Url::fromRoute('<current>');
    $current_path = $url->toString();
    $element['#view']->override_path = $current_path;

    // @todo Store views arguments serialized.
    $element['#view_arguments'] = _viewfield_get_view_args($element['#view_arguments'], $element['#entity_type'], $element['#entity']);
  }
  return $element;
}

/**
 * #post_render callback for a viewfield field.
 *
 * @see viewfield_pre_render()
 */
function viewfield_post_render($content, $element) {
  $stack = &drupal_static('viewfield_stack', array());
  unset($stack[$element['#entity_type']][$element['#entity_id']]);
  return $content;
}


/**
 * Perform argument replacement
 */
function _viewfield_get_view_args($vargs, $entity_type, $entity) {
  $args = array();

  if (!empty($vargs)) {
    $pos = 0;
    while ($pos < strlen($vargs)) {
      $found = FALSE;
      // If string starts with a quote, start after quote and get everything
      // before next quote.
      if (strpos($vargs, '"', $pos) === $pos) {
        if (($quote = strpos($vargs, '"', ++$pos)) !== FALSE) {
          // Skip pairs of quotes.
          while (!(($ql = strspn($vargs, '"', $quote)) & 1)) {
            $quote = strpos($vargs, '"', $quote + $ql);
          }
          $args[] = str_replace('""', '"', substr($vargs, $pos, $quote + $ql - $pos - 1));
          $pos = $quote + $ql + 1;
          $found = TRUE;
        }
      }
      elseif (($comma = strpos($vargs, ',', $pos)) !== FALSE) {
        // Otherwise, get everything before next comma.
        $args[] = substr($vargs, $pos, $comma - $pos);
        // Skip to after comma and repeat
        $pos = $comma + 1;
        $found = TRUE;
      }
      if (!$found) {
        $args[] = substr($vargs, $pos);
        $pos = strlen($vargs);
      }
    }

    list($entity_id) = $entity->id();
    $entity = entity_load($entity_type, $entity_id);
    $token_data = array($entity_type => $entity);

    $token = Drupal::token();
    foreach ($args as $key => $value) {
      $args[$key] = $token->replace($value, $token_data);
    }
  }

  return $args;
}