Club Drupal

<?php

/**

 * @file

 * Enhances the token API in core: adds a browseable UI, missing tokens, etc.

 */

/**

 * The maximum depth for token tree recursion.

 */

define('TOKEN_MAX_DEPTH', 9);

/**

 * Implements hook_help().

 */

function token_help($path, $arg) {

  if ($path == 'admin/help#token') {

    if (current_path() != 'admin/help/token') {

      // Because system_modules() executes hook_help() for each module to 'test'

      // if they will return anything, but not actually display it, we want to

      // return a TRUE value if this is not actually the help page.

      return TRUE;

    }

    $output = '<dl>';

    $output .= '<dt>' . t('List of the currently available tokens on this site') . '</dt>';

    $output .= '<dd>' . theme('token_tree', array('token_types' => 'all', 'click_insert' => FALSE, 'show_restricted' => TRUE)) . '</dd>';

    $output .= '</dl>';

    return $output;

  }

}

/**

 * Implements hook_system_info_alter().

 *

 * Prevent the token_actions module from being enabled since updates may have

 * left the old module files still in the directory.

 */

function token_system_info_alter(&$info, $file, $type) {

  if ($type == 'module' && $file->name == 'token_actions') {

    $info['hidden'] = TRUE;

  }

}

/**

 * Return an array of the core modules supported by token.module.

 */

function _token_core_supported_modules() {

  return array('book', 'field', 'menu', 'profile');

}

/**

 * Implements hook_menu().

 */

function token_menu() {

  /*$items['token/autocomplete/all/%menu_tail'] = array(

    'page callback' => 'token_autocomplete',

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

    'file' => 'token.pages.inc',

  );*/

  $items['token/autocomplete/%token_type'] = array(

    'page callback' => 'token_autocomplete_token',

    'page arguments' => array(2),

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

    'file' => 'token.pages.inc',

  );

  /*$items['token/autocomplete/%token_type/%menu_tail'] = array(

    'page callback' => 'token_autocomplete_token',

    'page arguments' => array(2, 3),

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

    'file' => 'token.pages.inc',

  );*/

  $items['token/tree'] = array(

    'page callback' => 'token_page_output_tree',

    'access callback' => TRUE,

    'type' => MENU_CALLBACK,

    'file' => 'token.pages.inc',

    'theme callback' => 'ajax_base_page_theme',

  );

  // Devel token pages.

  if (module_exists('devel')) {

    $items['node/%node/devel/token'] = array(

      'title' => 'Tokens',

      'page callback' => 'token_devel_token_object',

      'page arguments' => array('node', 1),

      'access arguments' => array('access devel information'),

      'type' => MENU_LOCAL_TASK,

      'file' => 'token.pages.inc',

      'weight' => 5,

    );

    $items['comment/%comment/devel/token'] = array(

      'title' => 'Tokens',

      'page callback' => 'token_devel_token_object',

      'page arguments' => array('comment', 1),

      'access arguments' => array('access devel information'),

      'type' => MENU_LOCAL_TASK,

      'file' => 'token.pages.inc',

      'weight' => 5,

    );

    $items['taxonomy/term/%taxonomy_term/devel/token'] = array(

      'title' => 'Tokens',

      'page callback' => 'token_devel_token_object',

      'page arguments' => array('taxonomy_term', 2),

      'access arguments' => array('access devel information'),

      'type' => MENU_LOCAL_TASK,

      'file' => 'token.pages.inc',

      'weight' => 5,

    );

    $items['user/%user/devel/token'] = array(

      'title' => 'Tokens',

      'page callback' => 'token_devel_token_object',

      'page arguments' => array('user', 1),

      'access arguments' => array('access devel information'),

      'type' => MENU_LOCAL_TASK,

      'file' => 'token.pages.inc',

      'weight' => 5,

    );

  }

  // Admin menu callback to clear token caches.

  $items['token/flush-cache'] = array(

    'page callback' => 'token_flush_cache_callback',

    'access arguments' => array('flush caches'),

    'type' => MENU_CALLBACK,

    'file' => 'token.pages.inc',

  );

  return $items;

}

/**

 * Implements hook_admin_menu_output_alter().

 */

function token_admin_menu_output_alter(&$content) {

  $content['icon']['icon']['flush-cache']['token'] = array(

    '#title' => t('Token registry'),

    '#href' => 'token/flush-cache',

    '#options' => array(

      'query' => drupal_get_destination() + array('token' => drupal_get_token('token/flush-cache')),

    ),

  );

}

function token_type_load($token_type) {

  $info = token_get_info();

  return isset($info['types'][$token_type]) ? $info['types'][$token_type] : FALSE;

}

/**

 * Implements hook_theme().

 */

function token_theme() {

  $info['tree_table'] = array(

    'variables' => array(

      'header' => array(),

      'rows' => array(),

      'attributes' => array(),

      'empty' => '',

      'caption' => '',

    ),

    'file' => 'token.pages.inc',

  );

  $info['token_tree'] = array(

    'variables' => array(

      'token_types' => array(),

      'global_types' => TRUE,

      'click_insert' => TRUE,

      'show_restricted' => FALSE,

      'recursion_limit' => 3,

      'dialog' => FALSE,

    ),

    'file' => 'token.pages.inc',

  );

  $info['token_tree_link'] = array(

    'variables' => array(

      'text' => NULL,

      'options' => array(),

      'dialog' => TRUE,

    ),

    'file' => 'token.pages.inc',

  );

  return $info;

}

/**

 * Implements hook_library().

 */

function token_library() {

  // jQuery treeTable plugin.

  $libraries['treeTable'] = array(

    'title' => 'jQuery treeTable',

    'website' => 'http://plugins.jquery.com/project/treetable',

    'version' => '2.3.0',

    'js' => array(

      drupal_get_path('module', 'token') . '/jquery.treeTable.js' => array(),

    ),

    'css' => array(

      drupal_get_path('module', 'token') . '/jquery.treeTable.css' => array(),

    ),

  );

  $libraries['dialog'] = array(

    'title' => 'Token dialog',

    'version' => '1.0',

    'js' => array(

      drupal_get_path('module', 'token') . '/token.js' => array(),

    ),

    'dependencies' => array(

      array('system', 'ui.dialog'),

    ),

  );

  return $libraries;

}

/**

 * Implements hook_form_alter().

 *

 * Adds a submit handler to forms which could affect the tokens available on

 * the site.

 */

function token_form_alter(&$form, $form_state, $form_id) {

  switch ($form_id) {

    // Profile field forms.

    case 'profile_field_form':

    case 'profile_field_delete':

    // User picture form.

    case 'user_admin_settings':

    // System date type form.

    // @todo Remove when http://drupal.org/node/1173706 is fixed.

    case 'system_add_date_format_type_form':

    case 'system_delete_date_format_type_form':

      $form += array('#submit' => array());

      array_unshift($form['#submit'], 'token_clear_cache');

      break;

  }

}

/**

 * Implements hook_block_view_alter().

 */

function token_block_view_alter(&$data, $block) {

  if (!empty($block->title) && $block->title != '<none>') {

    // Perform unsanitized token replacement since _block_render_blocks() will

    // call check_plain() on $block->title.

    $block->title = token_replace($block->title, array(), array('sanitize' => FALSE));

  }

}

/**

 * Implements hook_form_FORM_ID_alter().

 */

function token_form_block_add_block_form_alter(&$form, $form_state) {

  token_form_block_admin_configure_alter($form, $form_state);

}

/**

 * Implements hook_form_FORM_ID_alter().

 */

function token_form_block_admin_configure_alter(&$form, $form_state) {

  $form['settings']['title']['#description'] .= ' ' . t('This field supports tokens.');

  // @todo Figure out why this token validation does not seem to be working here.

  $form['settings']['title']['#element_validate'][] = 'token_element_validate';

  $form['settings']['title'] += array('#token_types' => array());

}

/**

 * Implements hook_widget_form_alter().

 */

function token_field_widget_form_alter(&$element, &$form_state, $context) {

  if (!empty($element['#description']) && is_string($element['#description'])) {

    $element['#description'] = filter_xss_admin(token_replace($element['#description']));

  }

}

/**

 * Implements hook_field_info_alter().

 */

function token_field_info_alter(&$info) {

  $defaults = array(

    'taxonomy_term_reference' => 'taxonomy_term_reference_plain',

    'number_integer' => 'number_unformatted',

    'number_decimal' => 'number_unformatted',

    'number_float' => 'number_unformatted',

    'file' => 'file_url_plain',

    'image' => 'file_url_plain',

    'text' => 'text_default',

    'text_long' => 'text_default',

    'text_with_summary' => 'text_default',

    'list_integer' => 'list_default',

    'list_float' => 'list_default',

    'list_text' => 'list_default',

    'list_boolean' => 'list_default',

  );

  foreach ($defaults as $field_type => $default_token_formatter) {

    if (isset($info[$field_type])) {

      $info[$field_type] += array('default_token_formatter' => $default_token_formatter);

    }

  }

}

/**

 * Implements hook_field_display_alter().

 */

function token_field_display_alter(&$display, $context) {

  if ($context['view_mode'] == 'token') {

    $view_mode_settings = field_view_mode_settings($context['instance']['entity_type'], $context['instance']['bundle']);

    // If the token view mode fell back to the 'default' view mode, then

    // use the default token formatter.

    if (empty($view_mode_settings[$context['view_mode']]['custom_settings'])) {

      $field_type_info = field_info_field_types($context['field']['type']);

      // If the field has specified a specific formatter to be used by default

      // with tokens, use that, otherwise use the default formatter.

      $formatter = !empty($field_type_info['default_token_formatter']) ? $field_type_info['default_token_formatter'] : $field_type_info['default_formatter'];

      // Now that we have a formatter, fill in all the settings.

      $display['type'] = $formatter;

      $formatter_info = field_info_formatter_types($formatter);

      $display['settings'] = isset($formatter_info['settings']) ? $formatter_info['settings'] : array();

      $display['settings']['label'] = 'hidden';

      $display['module'] = $formatter_info['module'];

    }

  }

}

/**

 * Implements hook_field_create_instance().

 */

function token_field_create_instance($instance) {

  token_clear_cache();

}

/**

 * Implements hook_field_update_instance().

 */

function token_field_update_instance($instance) {

  token_clear_cache();

}

/**

 * Implements hook_field_delete_instance().

 */

function token_field_delete_instance($instance) {

  token_clear_cache();

}

/**

 * Clear token caches and static variables.

 */

function token_clear_cache() {

  if (db_table_exists('cache_token')) {

    cache_clear_all('*', 'cache_token', TRUE);

  }

  drupal_static_reset('token_get_info');

  drupal_static_reset('token_get_global_token_types');

  drupal_static_reset('token_get_entity_mapping');

  drupal_static_reset('token_build_tree');

  drupal_static_reset('_token_profile_fields');

  drupal_static_reset('token_menu_link_load');

  drupal_static_reset('token_book_link_load');

  drupal_static_reset('token_node_menu_link_load');

  drupal_static_reset('_token_field_info');

}

/**

 * Return an array of entity type to token type mappings.

 *

 * Why do we need this? Because when the token API was moved to core we did not

 * re-use the entity type as the base name for taxonomy terms and vocabulary

 * tokens.

 *

 * @see token_entity_info_alter()

 * @see http://drupal.org/node/737726

 */

function token_get_entity_mapping($value_type = 'token', $value = NULL, $fallback = FALSE) {

  $mapping = &drupal_static(__FUNCTION__, array());

  if (empty($mapping)) {

    foreach (entity_get_info() as $entity_type => $info) {

      $mapping[$entity_type] = !empty($info['token type']) ? $info['token type'] : $entity_type;

    }

    // Allow modules to alter the mapping array.

    drupal_alter('token_entity_mapping', $mapping);

  }

  if (!isset($value)) {

    return $value_type == 'token' ? array_flip($mapping) : $mapping;

  }

  elseif ($value_type == 'token') {

    $return = array_search($value, $mapping);

    return $return !== FALSE ? $return : ($fallback ? $value : FALSE);

  }

  elseif ($value_type == 'entity') {

    return isset($mapping[$value]) ? $mapping[$value] : ($fallback ? $value : FALSE);

  }

}

/**

 * Implements hook_entity_info_alter().

 *

 * Because some token types to do not match their entity type names, we have to

 * map them to the proper type. This is purely for other modules' benefit.

 *

 * @see token_get_entity_mapping()

 * @see http://drupal.org/node/737726

 */

function token_entity_info_alter(&$info) {

  foreach (array_keys($info) as $entity_type) {

    // Add a token view mode if it does not already exist.

    if (!empty($info[$entity_type]['view modes']) && !isset($info[$entity_type]['view modes']['token'])) {

      $info[$entity_type]['view modes']['token'] = array(

        'label' => t('Tokens'),

        'custom settings' => FALSE,

      );

    }

    if (!empty($info[$entity_type]['token type'])) {

      // If the entity's token type is already defined, great!

      continue;

    }

    // Fill in default token types for entities.

    switch ($entity_type) {

      case 'taxonomy_term':

      case 'taxonomy_vocabulary':

        // Stupid taxonomy token types...

        $info[$entity_type]['token type'] = str_replace('taxonomy_', '', $entity_type);

        break;

      default:

        // By default the token type is the same as the entity type.

        $info[$entity_type]['token type'] = $entity_type;

        break;

    }

  }

}

/**

 * Implements hook_module_implements_alter().

 *

 * Adds missing token support for core modules.

 */

function token_module_implements_alter(&$implementations, $hook) {

  module_load_include('inc', 'token', 'token.tokens');

  if ($hook == 'tokens' || $hook == 'token_info' || $hook == 'token_info_alter' || $hook == 'tokens_alter') {

    foreach (_token_core_supported_modules() as $module) {

      if (module_exists($module) && function_exists($module . '_' . $hook)) {

        $implementations[$module] = FALSE;

      }

    }

    // Move token.module to get included first since it is responsible for

    // other modules.

    unset($implementations['token']);

    $implementations = array_merge(array('token' => 'tokens'), $implementations);

  }

}

/**

 * Implements hook_flush_caches().

 */

function token_flush_caches() {

  if (db_table_exists('cache_token')) {

    return array('cache_token');

  }

}

/**

 * Retrieve, sort, store token info from the cache.

 *

 * @param $token_type

 *   The optional token type that if specified will return

 *   $info['types'][$token_type].

 * @param $token

 *   The optional token name if specified will return

 *   $info['tokens'][$token_type][$token].

 *

 * @return

 *   An array of all token information from hook_token_info(), or the array

 *   of a token type or specific token.

 *

 * @see hook_token_info()

 * @see hook_token_info_alter()

 */

function token_get_info($token_type = NULL, $token = NULL) {

  global $language;

  // Use the advanced drupal_static() pattern, since this is called very often.

  static $drupal_static_fast;

  if (!isset($drupal_static_fast)) {

    $drupal_static_fast['token_info'] = &drupal_static(__FUNCTION__);

  }

  $token_info = &$drupal_static_fast['token_info'];

  if (empty($token_info)) {

    $cid = "info:{$language->language}";

    if ($cache = cache_get($cid, 'cache_token')) {

      $token_info = $cache->data;

    }

    else {

      $token_info = token_info();

      foreach (array_keys($token_info['types']) as $type_key) {

        if (isset($token_info['types'][$type_key]['type'])) {

          $base_type = $token_info['types'][$type_key]['type'];

          // If this token type extends another token type, then merge in

          // the base token type's tokens.

          if (isset($token_info['tokens'][$base_type])) {

            $token_info['tokens'] += array($type_key => array());

            $token_info['tokens'][$type_key] += $token_info['tokens'][$base_type];

          }

        }

        else {

          // Add a 'type' value to each token type so we can properly use

          // token_type_load().

          $token_info['types'][$type_key]['type'] = $type_key;

        }

      }

      // Pre-sort tokens.

      uasort($token_info['types'], 'token_asort_tokens');

      foreach (array_keys($token_info['tokens']) as $type) {

        uasort($token_info['tokens'][$type], 'token_asort_tokens');

      }

      // Store info in cache for future use.

      cache_set($cid, $token_info, 'cache_token');

    }

  }

  if (isset($token_type) && isset($token)) {

    return isset($token_info['tokens'][$token_type][$token]) ? $token_info['tokens'][$token_type][$token] : NULL;

  }

  elseif (isset($token_type)) {

    return isset($token_info['types'][$token_type]) ? $token_info['types'][$token_type] : NULL;

  }

  else {

    return $token_info;

  }

}

/**

 * Return the module responsible for a token.

 *

 * @param string $type

 *   The token type.

 * @param string $name

 *   The token name.

 *

 * @return mixed

 *   The value of $info['tokens'][$type][$name]['module'] from token_get_info(),

 *   or NULL if the value does not exist.

 */

function _token_module($type, $name) {

  $token_info = token_get_info($type, $name);

  return isset($token_info['module']) ? $token_info['module'] : NULL;

}

/**

 * uasort() callback to sort tokens by the 'name' property.

 */

function token_asort_tokens($token_a, $token_b) {

  return strnatcmp($token_a['name'], $token_b['name']);

}

/**

 * Get a list of token types that can be used without any context (global).

 *

 * @return

 *   An array of global token types.

 */

function token_get_global_token_types() {

  $global_types = &drupal_static(__FUNCTION__, array());

  if (empty($global_types)) {

    $token_info = token_get_info();

    foreach ($token_info['types'] as $type => $type_info) {

      // If the token types has not specified that 'needs-data' => TRUE, then

      // it is a global token type that will always be replaced in any context.

      if (empty($type_info['needs-data'])) {

        $global_types[] = $type;

      }

    }

  }

  return $global_types;

}

/**

 * Validate an tokens in raw text based on possible contexts.

 *

 * @param $value

 *   A string with the raw text containing the raw tokens, or an array of

 *   tokens from token_scan().

 * @param $tokens

 *   An array of token types that will be used when token replacement is

 *   performed.

 * @return

 *   An array with the invalid tokens in their original raw forms.

 */

function token_get_invalid_tokens_by_context($value, $valid_types = array()) {

  if (in_array('all', $valid_types)) {

    $info = token_get_info();

    $valid_types = array_keys($info['types']);

  }

  else {

    // Add the token types that are always valid in global context.

    $valid_types = array_merge($valid_types, token_get_global_token_types());

  }

  $invalid_tokens = array();

  $value_tokens = is_string($value) ? token_scan($value) : $value;

  foreach ($value_tokens as $type => $tokens) {

    if (!in_array($type, $valid_types)) {

      // If the token type is not a valid context, its tokens are invalid.

      $invalid_tokens = array_merge($invalid_tokens, array_values($tokens));

    }

    else {

      // Check each individual token for validity.

      $invalid_tokens = array_merge($invalid_tokens, token_get_invalid_tokens($type, $tokens));

    }

  }

  array_unique($invalid_tokens);

  return $invalid_tokens;

}

/**

 * Validate an array of tokens based on their token type.

 *

 * @param $type

 *   The type of tokens to validate (e.g. 'node', etc.)

 * @param $tokens

 *   A keyed array of tokens, and their original raw form in the source text.

 * @return

 *   An array with the invalid tokens in their original raw forms.

 */

function token_get_invalid_tokens($type, $tokens) {

  $token_info = token_get_info();

  $invalid_tokens = array();

  foreach ($tokens as $token => $full_token) {

    // Split token up if it has chains.

    $parts = explode(':', $token, 2);

    if (!isset($token_info['tokens'][$type][$parts[0]])) {

      // This is an invalid token (not defined).

      $invalid_tokens[] = $full_token;

    }

    elseif (count($parts) == 2) {

      $sub_token_info = $token_info['tokens'][$type][$parts[0]];

      if (!empty($sub_token_info['dynamic'])) {

        // If this token has been flagged as a dynamic token, skip it.

        continue;

      }

      elseif (empty($sub_token_info['type'])) {

        // If the token has chains, but does not support it, it is invalid.

        $invalid_tokens[] = $full_token;

      }

      else {

        // Resursively check the chained tokens.

        $sub_tokens = token_find_with_prefix(array($token => $full_token), $parts[0]);

        $invalid_tokens = array_merge($invalid_tokens, token_get_invalid_tokens($sub_token_info['type'], $sub_tokens));

      }

    }

  }

  return $invalid_tokens;

}

/**

 * Validate a form element that should have tokens in it.

 *

 * Form elements that want to add this validation should have the #token_types

 * parameter defined.

 *

 * For example:

 * @code

 * $form['my_node_text_element'] = array(

 *   '#type' => 'textfield',

 *   '#title' => t('Some text to token-ize that has a node context.'),

 *   '#default_value' => 'The title of this node is [node:title].',

 *   '#element_validate' => array('token_element_validate'),

 *   '#token_types' => array('node'),

 *   '#min_tokens' => 1,

 *   '#max_tokens' => 10,

 * );

 * @endcode

 */

function token_element_validate(&$element, &$form_state) {

  $value = isset($element['#value']) ? $element['#value'] : $element['#default_value'];

  if (!drupal_strlen($value)) {

    // Empty value needs no further validation since the element should depend

    // on using the '#required' FAPI property.

    return $element;

  }

  $tokens = token_scan($value);

  $title = empty($element['#title']) ? $element['#parents'][0] : $element['#title'];

  // @todo Find old Drupal 6 style tokens and add them to invalid tokens.

  // Validate if an element must have a minimum number of tokens.

  if (isset($element['#min_tokens']) && count($tokens) < $element['#min_tokens']) {

    // @todo Change this error message to include the minimum number.

    $error = format_plural($element['#min_tokens'], 'The %element-title cannot contain fewer than one token.', 'The %element-title must contain at least @count tokens.', array('%element-title' => $title));

    form_error($element, $error);

  }

  // Validate if an element must have a maximum number of tokens.

  if (isset($element['#max_tokens']) && count($tokens) > $element['#max_tokens']) {

    // @todo Change this error message to include the maximum number.

    $error = format_plural($element['#max_tokens'], 'The %element-title must contain as most one token.', 'The %element-title must contain at most @count tokens.', array('%element-title' => $title));

    form_error($element, $error);

  }

  // Check if the field defines specific token types.

  if (isset($element['#token_types'])) {

    $invalid_tokens = token_get_invalid_tokens_by_context($tokens, $element['#token_types']);

    if ($invalid_tokens) {

      form_error($element, t('The %element-title is using the following invalid tokens: @invalid-tokens.', array('%element-title' => $title, '@invalid-tokens' => implode(', ', $invalid_tokens))));

    }

  }

  return $element;

}

/**

 * Deprecated. Use token_element_validate() instead.

 */

function token_element_validate_token_context(&$element, &$form_state) {

  return token_element_validate($element, $form_state);

}

/**

 * Implements hook_form_FORM_ID_alter().

 */

function token_form_field_ui_field_edit_form_alter(&$form, $form_state) {

  if (!isset($form['instance']) || !empty($form['#field']['locked'])) {

    return;

  }

  if (($form['#field']['type'] == 'file' || $form['#field']['type'] == 'image') && isset($form['instance']['settings']['file_directory']) && !module_exists('filefield_paths')) {

    // GAH! We can only support global tokens in the upload file directory path.

    $form['instance']['settings']['file_directory']['#element_validate'][] = 'token_element_validate';

    $form['instance']['settings']['file_directory'] += array('#token_types' => array());

    $form['instance']['settings']['file_directory']['#description'] .= ' ' . t('This field supports tokens.');

  }

  // Note that the description is tokenized via token_field_widget_form_alter().

  $form['instance']['description']['#description'] .= '<br />' . t('This field supports tokens.');

  $form['instance']['description']['#element_validate'][] = 'token_element_validate';

  $form['instance']['description'] += array('#token_types' => array());

  $form['instance']['settings']['token_tree'] = array(

    '#theme' => 'token_tree',

    '#token_types' => array(),

    '#dialog' => TRUE,

    '#weight' => $form['instance']['description']['#weight'] + 0.5,

  );

}

/**

 * Implements hook_form_FORM_ID_alter().

 *

 * Alters the configure action form to add token context validation and

 * adds the token tree for a better token UI and selection.

 */

function token_form_system_actions_configure_alter(&$form, $form_state) {

  $action = actions_function_lookup($form['actions_action']['#value']);

  switch ($action) {

    case 'system_message_action':

    case 'system_send_email_action':

    case 'system_goto_action':

      $form['token_tree'] = array(

        '#theme' => 'token_tree',

        '#token_types' => 'all',

        '#dialog' => TRUE,

        '#weight' => 100,

      );

      // @todo Add token validation to the action fields that can use tokens.

      break;

  }

}

/**

 * Implements hook_form_FORM_ID_alter().

 *

 * Alters the user e-mail fields to add token context validation and

 * adds the token tree for a better token UI and selection.

 */

function token_form_user_admin_settings_alter(&$form, &$form_state) {

  $email_token_help = t('Available variables are: [site:name], [site:url], [user:name], [user:mail], [site:login-url], [site:url-brief], [user:edit-url], [user:one-time-login-url], [user:cancel-url].');

  foreach (element_children($form) as $key) {

    $element = &$form[$key];

    // Remove the crummy default token help text.

    if (!empty($element['#description'])) {

      $element['#description'] = trim(str_replace($email_token_help, t('The list of available tokens that can be used in e-mails is provided below.'), $element['#description']));

    }

    switch ($key) {

      case 'email_admin_created':

      case 'email_pending_approval':

      case 'email_no_approval_required':

      case 'email_password_reset':

      case 'email_cancel_confirm':

        // Do nothing, but allow execution to continue.

        break;

      case 'email_activated':

      case 'email_blocked':

      case 'email_canceled':

        // These fieldsets have their e-mail elements inside a 'settings'

        // sub-element, so switch to that element instead.

        $element = &$form[$key]['settings'];

        break;

      default:

        continue 2;

    }

    foreach (element_children($element) as $sub_key) {

      if (!isset($element[$sub_key]['#type'])) {

        continue;

      }

      elseif ($element[$sub_key]['#type'] == 'textfield' && substr($sub_key, -8) === '_subject') {

        // Add validation to subject textfields.

        $element[$sub_key]['#element_validate'][] = 'token_element_validate';

        $element[$sub_key] += array('#token_types' => array('user'));

      }

      elseif ($element[$sub_key]['#type'] == 'textarea' && substr($sub_key, -5) === '_body') {

        // Add validation to body textareas.

        $element[$sub_key]['#element_validate'][] = 'token_element_validate';

        $element[$sub_key] += array('#token_types' => array('user'));

      }

    }

  }

  // Add the token tree UI.

  $form['email']['token_tree'] = array(

    '#theme' => 'token_tree',

    '#token_types' => array('user'),

    '#show_restricted' => TRUE,

    '#dialog' => TRUE,

    '#weight' => 90,

  );

}

/**

 * Build a tree array of tokens used for themeing or information.

 *

 * @param $token_type

 *   The token type.

 * @param $flat_tree

 *   A boolean if TRUE will only make a flat array of tokens, otherwise

 *   child tokens will be inside the 'children' parameter of a token.

 * @param $show_restricted

 *   A boolean if TRUE will show restricted tokens. Otherwise they will be

 *   hidden. Default is FALSE.

 * @param $recursion_limit

 *   An integer with the maximum number of token levels to recurse.

 * @param $parents

 *   An optional array with the current parents of the tokens.

 */

function token_build_tree($token_type, array $options = array()) {

  global $language;

  // Static cache of already built token trees.

  $trees = &drupal_static(__FUNCTION__, array());

  $options += array(

    'restricted' => FALSE,

    'depth' => 4,

    'data' => array(),

    'values' => FALSE,

    'flat' => FALSE,

  );

  // Do not allow past the maximum token information depth.

  $options['depth'] = min($options['depth'], TOKEN_MAX_DEPTH);

  // If $token_type is an entity, make sure we are using the actual token type.

  if ($entity_token_type = token_get_entity_mapping('entity', $token_type)) {

    $token_type = $entity_token_type;

  }

  $tree_cid = "tree:{$token_type}:{$language->language}:{$options['depth']}";

  // If we do not have this base tree in the static cache, check {cache_token}

  // otherwise generate and store it in the cache.

  if (!isset($trees[$tree_cid])) {

    if ($cache = cache_get($tree_cid, 'cache_token')) {

      $trees[$tree_cid] = $cache->data;

    }

    else {

      $options['parents'] = array();

      $trees[$tree_cid] = _token_build_tree($token_type, $options);

      cache_set($tree_cid, $trees[$tree_cid], 'cache_token');

    }

  }

  $tree = $trees[$tree_cid];

  // If the user has requested a flat tree, convert it.

  if (!empty($options['flat'])) {

    $tree = token_flatten_tree($tree);

  }

  // Fill in token values.

  if (!empty($options['values'])) {

    $token_values = array();

    foreach ($tree as $token => $token_info) {

      if (!empty($token_info['dynamic']) || !empty($token_info['restricted'])) {

        continue;

      }

      elseif (!isset($token_info['value'])) {

        $token_values[$token_info['token']] = $token;

      }

    }

    if (!empty($token_values)) {

      $token_values = token_generate($token_type, $token_values, $options['data']);

      foreach ($token_values as $token => $replacement) {

        $tree[$token]['value'] = $replacement;

      }

    }

  }

  return $tree;

}

/**

 * Flatten a token tree.

 */

function token_flatten_tree($tree) {

  $result = array();

  foreach ($tree as $token => $token_info) {

    $result[$token] = $token_info;

    if (isset($token_info['children']) && is_array($token_info['children'])) {

      $result += token_flatten_tree($token_info['children']);

      // unset($result[$token]['children']);

    }

  }

  return $result;

}

/**

 * Generate a token tree.

 */

function _token_build_tree($token_type, array $options) {

  $options += array(

    'parents' => array(),

  );

  $info = token_get_info();

  if ($options['depth'] <= 0 || !isset($info['types'][$token_type]) || !isset($info['tokens'][$token_type])) {

    return array();

  }

  $tree = array();

  foreach ($info['tokens'][$token_type] as $token => $token_info) {

    // Build the raw token string.

    $token_parents = $options['parents'];

    if (empty($token_parents)) {

      // If the parents array is currently empty, assume the token type is its

      // parent.

      $token_parents[] = $token_type;

    }

    elseif (in_array($token, array_slice($token_parents, 1))) {

      // Prevent duplicate recursive tokens. For example, this will prevent

      // the tree from generating the following tokens or deeper:

      // [comment:parent:parent]

      // [comment:parent:root:parent]

      continue;

    }

    $token_parents[] = $token;

    if (!empty($token_info['dynamic'])) {

      $token_parents[] = '?';

    }

    $raw_token = '[' . implode(':', $token_parents) . ']';

    $tree[$raw_token] = $token_info;

    $tree[$raw_token]['raw token'] = $raw_token;

    // Add the token's real name (leave out the base token type).

    $tree[$raw_token]['token'] = implode(':', array_slice($token_parents, 1));

    // Add the token's parent as its raw token value.

    if (!empty($options['parents'])) {

      $tree[$raw_token]['parent'] = '[' . implode(':', $options['parents']) . ']';

    }

    // Fetch the child tokens.

    if (!empty($token_info['type'])) {

      $child_options = $options;

      $child_options['depth']--;

      $child_options['parents'] = $token_parents;

      $tree[$raw_token]['children'] = _token_build_tree($token_info['type'], $child_options);

    }

  }

  return $tree;

}

/**

 * Get a translated menu link by its mlid, without access checking.

 *

 * This function is a copy of menu_link_load() but with its own cache and a

 * simpler query to load the link. This also skips normal menu link access

 * checking by using _token_menu_link_translate().

 *

 * @param $mlid

 *   The mlid of the menu item.

 *

 * @return

 *   A menu link translated for rendering.

 *

 * @see menu_link_load()

 * @see _token_menu_link_translate()

 */

function token_menu_link_load($mlid) {

  $cache = &drupal_static(__FUNCTION__, array());

  if (!is_numeric($mlid)) {

    return FALSE;

  }

  if (!isset($cache[$mlid])) {

    $item = db_query("SELECT * FROM {menu_links} ml LEFT JOIN {menu_router} m ON m.path = ml.router_path WHERE ml.mlid = :mlid", array(':mlid' => $mlid))->fetchAssoc();

    if (!empty($item)) {

      _token_menu_link_translate($item);

    }

    $cache[$mlid] = $item;

  }

  return $cache[$mlid];

}

/**

 * Get a translated book menu link by its mlid, without access checking.

 *

 * This function is a copy of book_link_load() but with its own cache and a

 * simpler query to load the link. This also skips normal menu link access

 * checking by using _token_menu_link_translate().

 *

 * @param $mlid

 *   The mlid of the book menu item.

 *

 * @return

 *   A book menu link translated for rendering.

 *

 * @see book_link_load()

 * @see _token_menu_link_translate()

 */

function token_book_link_load($mlid) {

  $cache = &drupal_static(__FUNCTION__, array());

  if (!is_numeric($mlid)) {

    return FALSE;

  }

  if (!isset($cache[$mlid])) {

    $item = db_query("SELECT * FROM {menu_links} ml INNER JOIN {book} b ON b.mlid = ml.mlid LEFT JOIN {menu_router} m ON m.path = ml.router_path WHERE ml.mlid = :mlid", array(':mlid' => $mlid))->fetchAssoc();

    if (!empty($item)) {

      _token_menu_link_translate($item);

    }

    $cache[$mlid] = $item;

  }

  return $cache[$mlid];

}

function _token_menu_link_translate(&$item) {

  $map = array();

  if (!is_array($item['options'])) {

    $item['options'] = unserialize($item['options']);

  }

  if ($item['external']) {

    $item['access'] = 1;

    $item['href'] = $item['link_path'];

    $item['title'] = $item['link_title'];

    $item['localized_options'] = $item['options'];

  }

  else {

    // Complete the path of the menu link with elements from the current path,

    // if it contains dynamic placeholders (%).

    $map = explode('/', $item['link_path']);

    if (strpos($item['link_path'], '%') !== FALSE) {

      // Invoke registered to_arg callbacks.

      if (!empty($item['to_arg_functions'])) {

        _menu_link_map_translate($map, $item['to_arg_functions']);

      }

    }

    $item['href'] = implode('/', $map);

    // Skip links containing untranslated arguments.

    if (strpos($item['href'], '%') !== FALSE) {

      $item['access'] = FALSE;

      return FALSE;

    }

    $item['access'] = TRUE;

    _menu_item_localize($item, $map, TRUE);

  }

  // Allow other customizations - e.g. adding a page-specific query string to the

  // options array. For performance reasons we only invoke this hook if the link

  // has the 'alter' flag set in the options array.

  if (!empty($item['options']['alter'])) {

    drupal_alter('translated_menu_link', $item, $map);

  }

  return $map;

}