shoutbox_tags.module in Shoutbox 7

File

shoutbox_tags/shoutbox_tags.module

<?php

/**
 * Implements hook_menu().
 */
function shoutbox_tags_menu() {
  return array(
    'shoutbox/tag/%/js/view' => array(
      'title' => 'Shout tag',
      'page callback' => 'shoutbox_tags_js_view',
      'page arguments' => array(
        2,
      ),
      'access arguments' => array(
        'view shouts',
      ),
      'description' => 'Javascript callback for viewing shout tags',
      'type' => MENU_CALLBACK,
    ),
  );
}

/**
 * Implements hook_shoutbox().
 */
function shoutbox_tags_shoutbox($op, &$shout, &$a1 = NULL, $form_state = NULL) {
  switch ($op) {
    case 'insert':

      // Extract the tags
      if ($tags = shoutbox_tags_extract($shout)) {

        // Save the tags
        shoutbox_tags_save($shout, $tags);
      }
      break;
    case 'edit':

      // Delete any tags from the shout
      shoutbox_tags_shoutbox('delete', $shout);

      // Redetect any tags from the shout
      shoutbox_tags_shoutbox('insert', $shout);
      break;
    case 'delete':

      // Remove any tag references to this shout
      db_delete('shoutbox_tags')
        ->condition('shout_id', $shout->shout_id)
        ->execute();
      break;
    case 'view':

      // Replace tags with links
      shoutbox_tags_to_links($shout);
      break;
    case 'context':

      // If we're viewing a tag, only returned shouts that have the tag
      if ($tag = shoutbox_tags_is_page()) {
        $a1['shoutbox_tags'] = $tag;
      }
      break;
    case 'js path':

      // Alter the js update path so only shouts with the given
      // tag are shown
      if ($tag = shoutbox_tags_is_page()) {
        $a1 = "shoutbox/tag/{$tag}/js/view/";
      }
      break;
    case 'form':

      // Remove the shout form if we're viewing a tag
      if (shoutbox_tags_is_page()) {
        $a1 = array();
      }
      break;
  }
}

/**
 * Implements hook_query_TAG_alter().
 */
function shoutbox_tags_query_shouts_alter(QueryAlterableInterface $query) {
  $tag = $query
    ->getMetaData('shoutbox_tags');
  if ($query
    ->hasTag('shouts') && NULL != $tag) {
    $query
      ->join('shoutbox_tags', 't', 's.shout_id = t.shout_id');
    $query
      ->condition('t.tag', $tag, '=');
  }
}

/**
 * Determine if we're viewing a shout tag page
 *
 * @return
 *   The tag, otherwise FALSE is we're not viewing a tag page
 */
function shoutbox_tags_is_page() {
  if (arg(0) == 'shoutbox' && arg(1) == 'tag' && ($tag = filter_xss(arg(2)))) {
    return $tag;
  }
  return FALSE;
}

/**
 * Replace tags with links inside a shout
 *
 * @param &$shout
 *   A shout object
 */
function shoutbox_tags_to_links(&$shout) {

  // Extract the tags
  $tags = shoutbox_tags_extract($shout);

  // Replace the links with tags
  foreach ($tags as $tag) {
    $shout->shout = str_replace('#' . $tag, l('#' . $tag, 'shoutbox/tag/' . strtolower($tag)), $shout->shout);
  }
}

/**
 * Extract tags from a shout
 *
 * @param $shout
 *   A shout object
 * @return
 *   An array of unique tags
 */
function shoutbox_tags_extract($shout) {
  $tags = array();

  // Break down the shout by word
  $words = explode(' ', $shout->shout);
  foreach ($words as $word) {

    // See if the word begins with a #
    if (substr($word, 0, 1) == '#') {

      // Remove the #
      $word = str_replace('#', '', $word);

      // Remove a trailing non alphanumeric
      if (preg_match('/\\W/', substr($word, strlen($word) - 1))) {
        $word = substr($word, 0, strlen($word) - 1);
      }

      // Store the tag
      $tags[] = $word;
    }
  }

  // Remove duplicates and return
  return array_unique($tags);
}

/**
 * Save a tag or tags for a given shout
 *
 * @param $shout
 *   A shout object
 * @param $tags
 *   A single tag or array of tags. This function will not
 *   check for duplicate entries for the given shout.
 */
function shoutbox_tags_save($shout, $tags) {

  // If a single tag is given, place it in an array
  if (!is_array($tags)) {
    $tags = array(
      $tags,
    );
  }

  // Save each tag
  foreach ($tags as $tag) {
    $record = new stdClass();
    $record->shout_id = $shout->shout_id;
    $record->tag = strtolower($tag);
    drupal_write_record('shoutbox_tags', $record);
  }
}

/**
 * Javascript callback for viewing shouts for a given tag
 */
function shoutbox_tags_js_view($tag) {

  // This callback is only needed to keep the
  // URL like shoutbox/tag/%tag so the query gets altered
  shoutbox_js_view();
}

Functions

Name	Description
shoutbox_tags_extract	Extract tags from a shout
shoutbox_tags_is_page	Determine if we're viewing a shout tag page
shoutbox_tags_js_view	Javascript callback for viewing shouts for a given tag
shoutbox_tags_menu	Implements hook_menu().
shoutbox_tags_query_shouts_alter	Implements hook_query_TAG_alter().
shoutbox_tags_save	Save a tag or tags for a given shout
shoutbox_tags_shoutbox	Implements hook_shoutbox().
shoutbox_tags_to_links	Replace tags with links inside a shout