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<?php
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/**
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* @file
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* Provide diff functions for the node module.
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*/
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/**
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* Implements hook_entity_diff().
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*
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* This function compares core node properties. This is currently limited to:
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* - title: The title of the node.
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*
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* @param object $old_node
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* The older node revision.
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* @param object $new_node
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* The newer node revision.
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* @param array $context
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* An associative array containing:
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* - entity_type: The entity type; e.g., 'node' or 'user'.
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* - old_entity: The older entity.
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* - new_entity: The newer entity.
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* - view_mode: The view mode to use. Defaults to FALSE. If no view mode is
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* given, the recommended fallback view mode is 'default'.
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* - states: An array of view states. These could be one of:
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* - raw: The raw value of the diff, the classic 7.x-2.x view.
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* - rendered: The rendered HTML as determined by the view mode. Only
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* return markup for this state if the value is normally shown
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* by this view mode. The user will most likely be able to see
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* the raw or raw_plain state, so this is optional.
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*
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* The rendering state is a work in progress.
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*
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* Conditionally, you can get these states, but setting these will override
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* the user selectable markdown method.
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*
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* - raw_plain: As raw, but text should be markdowned.
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* - rendered_plain: As rendered, but text should be markdowned.
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*
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* @return array
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* An associative array of values keyed by the entity property.
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*
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* This is effectively an unnested Form API-like structure.
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*
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* States are returned as follows:
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*
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* $results['line'] = array(
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* '#name' => t('Line'),
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* '#states' => array(
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* 'raw' => array(
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* '#old' => '<p class="line">This was the old line number [tag].</p>',
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* '#new' => '<p class="line">This is the new line [tag].</p>',
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* ),
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* 'rendered' => array(
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* '#old' => '<p class="line">This was the old line number <span class="line-number">57</span>.</p>',
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* '#new' => '<p class="line">This is the new line <span class="line-number">57</span>.</p>',
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* ),
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* ),
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* );
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*
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* For backwards compatability, no changes are required to support states,
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* but it is recommended to provide a better UI for end users.
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*
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* For example, the following example is equivalent to returning the raw
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* state from the example above.
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*
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* $results['line'] = array(
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* '#name' => t('Line'),
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* '#old' => '<p class="line">This was the old line number [tag].</p>',
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* '#new' => '<p class="line">This is the new line [tag].</p>',
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* );
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*/
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function node_entity_diff($old_node, $new_node, $context) {
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$result = array();
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if ($context['entity_type'] == 'node') {
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$type = node_type_get_type($new_node);
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$result['title'] = array(
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'#name' => $type->title_label,
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'#states' => array(),
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'#weight' => -5,
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'#settings' => array(
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// Global setting - 'diff_show_header_' . $entity_type
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'show_header' => variable_get('diff_show_header_node', 1),
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),
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);
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foreach ($context['states'] as $state) {
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switch ($state) {
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case 'rendered':
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$result['title']['#states'][$state] = array(
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'#old' => l($old_node->title, 'node/' . $old_node->title),
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'#new' => l($new_node->title, 'node/' . $new_node->title),
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);
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break;
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// We specify a default so that the title is allows compared.
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case 'raw':
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default:
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$result['title']['#states'][$state] = array(
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'#old' => array($old_node->title),
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'#new' => array($new_node->title),
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);
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break;
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}
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}
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}
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return $result;
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}
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