Club Drupal

<?php

/**

 * @file

 * Provide diff functions for the node module.

 */

/**

 * Implements hook_entity_diff().

 *

 * This function compares core node properties. This is currently limited to:

 *   - title: The title of the node.

 *

 * @param object $old_node

 *   The older node revision.

 * @param object $new_node

 *   The newer node revision.

 * @param array $context

 *   An associative array containing:

 *   - entity_type: The entity type; e.g., 'node' or 'user'.

 *   - old_entity: The older entity.

 *   - new_entity: The newer entity.

 *   - view_mode: The view mode to use. Defaults to FALSE. If no view mode is

 *                given, the recommended fallback view mode is 'default'.

 *   - states: An array of view states. These could be one of:

 *     - raw: The raw value of the diff, the classic 7.x-2.x view.

 *     - rendered: The rendered HTML as determined by the view mode. Only

 *                 return markup for this state if the value is normally shown

 *                 by this view mode. The user will most likely be able to see

 *                 the raw or raw_plain state, so this is optional.

 *

 *                 The rendering state is a work in progress.

 *

 *     Conditionally, you can get these states, but setting these will override

 *     the user selectable markdown method.

 *

 *     - raw_plain: As raw, but text should be markdowned.

 *     - rendered_plain: As rendered, but text should be markdowned.

 *

 * @return array

 *   An associative array of values keyed by the entity property.

 *

 *   This is effectively an unnested Form API-like structure.

 *

 *   States are returned as follows:

 *

 *   $results['line'] = array(

 *     '#name' => t('Line'),

 *     '#states' => array(

 *       'raw' => array(

 *         '#old' => '<p class="line">This was the old line number [tag].</p>',

 *         '#new' => '<p class="line">This is the new line [tag].</p>',

 *       ),

 *       'rendered' => array(

 *         '#old' => '<p class="line">This was the old line number <span class="line-number">57</span>.</p>',

 *         '#new' => '<p class="line">This is the new line <span class="line-number">57</span>.</p>',

 *       ),

 *     ),

 *   );

 *

 *   For backwards compatability, no changes are required to support states,

 *   but it is recommended to provide a better UI for end users.

 *

 *   For example, the following example is equivalent to returning the raw

 *   state from the example above.

 *

 *   $results['line'] = array(

 *     '#name' => t('Line'),

 *     '#old' => '<p class="line">This was the old line number [tag].</p>',

 *     '#new' => '<p class="line">This is the new line [tag].</p>',

 *   );

 */

function node_entity_diff($old_node, $new_node, $context) {

  $result = array();

  if ($context['entity_type'] == 'node') {

    $type = node_type_get_type($new_node);

    $result['title'] = array(

      '#name' => $type->title_label,

      '#states' => array(),

      '#weight' => -5,

      '#settings' => array(

        // Global setting - 'diff_show_header_' . $entity_type

        'show_header' => variable_get('diff_show_header_node', 1),

      ),

    );

    foreach ($context['states'] as $state) {

      switch ($state) {

        case 'rendered':

          $result['title']['#states'][$state] = array(

            '#old' => l($old_node->title, 'node/' . $old_node->title),

            '#new' => l($new_node->title, 'node/' . $new_node->title),

          );

          break;

        // We specify a default so that the title is allows compared.

        case 'raw':

        default:

          $result['title']['#states'][$state] = array(

            '#old' => array($old_node->title),

            '#new' => array($new_node->title),

          );

          break;

      }

    }

  }

  return $result;

}