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Drupal example source code file (token.module)

This example Drupal source code file (token.module) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

array, description, foreach, function, if, language, leading, php, return, the, token_prefix, tokens, translate, type

The token.module Drupal example source code

<?php
// $Id: token.module,v 1.7.4.38 2010/09/30 19:39:43 davereid Exp $

/**
 * @file
 * The Token API module.
 *
 * The Token module provides an API for providing tokens to other modules.
 * Tokens are small bits of text that can be placed into larger documents
 * via simple placeholders, like %site-name or [user].
 *
 * @ingroup token
 */

/**
 * The default token prefix string.
 */
define('TOKEN_PREFIX', '[');

/**
 * The default token suffix string.
 */
define('TOKEN_SUFFIX', ']');

/**
 * Implements hook_help().
 */
function token_help($path, $arg) {
  if ($path == 'admin/help#token') {
    $output = '<dl>';
    $output .= '<dt>' . t('List of the currently available tokens on this site') . '</dt>';
    $output .= '<dd>' . theme('token_tree', 'all', TRUE, FALSE) . '</dd>';
    $output .= '</dl>';
    return $output;
  }
}

/**
 * Return an array of the core modules supported by token.module.
 */
function _token_core_supported_modules() {
  return array('node', 'user', 'taxonomy', 'comment');
}

/**
 * Implements hook_menu().
 */
function token_menu() {
  $items = array();

  // 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['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,
    );
  }

  return $items;
}

/**
 * Implements hook_theme().
 */
function token_theme() {
  return array(
    'token_help' => array(
      'arguments' => array('type' => 'all', 'prefix' => TOKEN_PREFIX, 'suffix' => TOKEN_SUFFIX),
      'file' => 'token.pages.inc',
    ),
    'token_tree' => array(
      'arguments' => array('token_types' => array(), 'global_types' => TRUE , 'click_insert' => TRUE),
      'file' => 'token.pages.inc',
    ),
  );
}

/**
 * Implements hook_token_values().
 */
function token_token_values($type, $object = NULL) {
  global $user;
  $values = array();

  switch ($type) {
    case 'global':
      // Current user tokens.
      $values['user-name']    = $user->uid ? $user->name : variable_get('anonymous', t('Anonymous'));
      $values['user-id']      = $user->uid ? $user->uid : 0;
      $values['user-mail']    = $user->uid ? $user->mail : '';

      // Site information tokens.
      $values['site-url']     = url('<front>', array('absolute' => TRUE));
      $values['site-name']    = check_plain(variable_get('site_name', t('Drupal')));
      $values['site-slogan']  = check_plain(variable_get('site_slogan', ''));
      $values['site-mission'] = filter_xss_admin(variable_get('site_mission', ''));
      $values['site-mail']    = variable_get('site_mail', '');
      $values += token_get_date_token_values(NULL, 'site-date-');
      $values['site-date'] = $values['site-date-small'];

      // Current page tokens.
      $values['current-page-title'] = drupal_get_title();
      $alias = drupal_get_path_alias($_GET['q']);
      $values['current-page-path'] = $alias;
      $values['current-page-path-raw'] = check_plain($alias);
      $values['current-page-url'] = url($_GET['q'], array('absolute' => TRUE));

      $page = isset($_GET['page']) ? $_GET['page'] : '';
      $pager_page_array = explode(',', $page);
      $page = $pager_page_array[0];
      $values['current-page-number'] = (int) $page + 1;
      $values['page-number'] = $values['current-page-number'];

      break;
  }
  return $values;
}

/**
 * Implements hook_token_list().
 */
function token_token_list($type = 'all') {
  $tokens = array();

  if ($type == 'global' || $type == 'all') {
    // Current user tokens.
    $tokens['global']['user-name']    = t('The name of the currently logged in user.');
    $tokens['global']['user-id']      = t('The user ID of the currently logged in user.');
    $tokens['global']['user-mail']    = t('The email address of the currently logged in user.');

    // Site information tokens.
    $tokens['global']['site-url']     = t("The URL of the site's front page.");
    $tokens['global']['site-name']    = t('The name of the site.');
    $tokens['global']['site-slogan']  = t('The slogan of the site.');
    $tokens['global']['site-mission'] = t("The optional 'mission' of the site.");
    $tokens['global']['site-mail']    = t('The administrative email address for the site.');
    $tokens['global'] += token_get_date_token_info(t('The current'), 'site-date-');

    // Current page tokens.
    $tokens['global']['current-page-title']    = t('The title of the current page.');
    $tokens['global']['current-page-path']     = t('The URL alias of the current page.');
    $tokens['global']['current-page-path-raw'] = t('The URL alias of the current page.');
    $tokens['global']['current-page-url']      = t('The URL of the current page.');
    $tokens['global']['current-page-number']   = t('The page number of the current page when viewing paged lists.');
  }

  return $tokens;
}

/**
 * General function to include the files that token relies on for the real work.
 */
function token_include() {
  static $run = FALSE;

  if (!$run) {
    $run = TRUE;
    $modules_enabled = array_keys(module_list());
    $modules = array_intersect(_token_core_supported_modules(), $modules_enabled);
    foreach ($modules as $module) {
      module_load_include('inc', 'token', "token_$module");
    }
  }
}

/**
 * Replace all tokens in a given string with appropriate values.
 *
 * @param $text
 *   A string potentially containing replaceable tokens.
 * @param $type
 *   (optional) A flag indicating the class of substitution tokens to use. If
 *   an object is passed in the second param, 'type' should contain the
 *   object's type. For example, 'node', 'comment', or 'user'. If no type is
 *   specified, only 'global' site-wide substitution tokens are built.
 * @param $object
 *   (optional) An object to use for building substitution values (e.g. a node
 *   comment, or user object).
 * @param $leading
 *   (optional) Character(s) to prepend to the token key before searching for
 *   matches. Defaults to TOKEN_PREFIX.
 * @param $trailing
 *   (optional) Character(s) to append to the token key before searching for
 *   matches. Defaults to TOKEN_SUFFIX.
 * @param $options
 *   (optional) A keyed array of settings and flags to control the token
 *   generation and replacement process.
 * @param $flush
 *   (optional) A flag indicating whether or not to flush the token cache.
 *   Useful for processes that need to slog through huge numbers of tokens
 *   in a single execution cycle. Flushing it will keep them from burning
 *   through memory. Defaults to FALSE.
 *
 * @return
 *   Text with tokens replaced.
 */
function token_replace($text, $type = 'global', $object = NULL, $leading = TOKEN_PREFIX, $trailing = TOKEN_SUFFIX, $options = array(), $flush = FALSE) {
  $full = token_get_values($type, $object, $flush, $options);
  $tokens = token_prepare_tokens($full->tokens, $leading, $trailing);
  return str_replace($tokens, $full->values, $text);
}

/**
 * Replace all tokens in a given string with appropriate values.
 *
 * Contrary to token_replace() this function supports replacing multiple types.
 *
 * @param $text
 *   A string potentially containing replaceable tokens.
 * @param $types
 *   (optional) An array of substitution classes and optional objects. The key
 *   is a flag indicating the class of substitution tokens to use. If an object
 *   is passed as value, the key should contain the object's type. For example,
 *   'node', 'comment', or 'user'. The object will be used for building
 *   substitution values. If no type is specified, only 'global' site-wide
 *   substitution tokens are built.
 * @param $leading
 *   (optional) Character(s) to prepend to the token key before searching for
 *   matches. Defaults to TOKEN_PREFIX.
 * @param $trailing
 *   (optional) Character(s) to append to the token key before searching for
 *   matches. Defaults to TOKEN_SUFFIX.
 * @param $options
 *   (optional) A keyed array of settings and flags to control the token
 *   generation and replacement process.
 * @param $flush
 *   (optional) A flag indicating whether or not to flush the token cache.
 *   Useful for processes that need to slog through huge numbers of tokens
 *   in a single execution cycle. Flushing it will keep them from burning
 *   through memory. Defaults to FALSE.
 *
 * @return
 *   Text with tokens replaced.
 */
function token_replace_multiple($text, $types = array(), $leading = TOKEN_PREFIX, $trailing = TOKEN_SUFFIX, $options = array(), $flush = FALSE) {
  $full = new stdClass();
  $full->tokens = $full->values = array();

  // Allow global token replacement by default.
  if (empty($types) || !is_array($types)) {
    $types = array('global' => NULL);
  }

  foreach ($types as $type => $object) {
    $temp = token_get_values($type, $object, $flush, $options);
    $full->tokens = array_merge($full->tokens, $temp->tokens);
    $full->values = array_merge($full->values, $temp->values);
  }

  $tokens = token_prepare_tokens($full->tokens, $leading, $trailing);
  return str_replace($tokens, $full->values, $text);
}

/**
 * Return a list of valid substitution tokens and their values for
 * the specified type.
 *
 * @param $type
 *   (optional) A flag indicating the class of substitution tokens to use. If an
 *   object is passed in the second param, 'type' should contain the
 *   object's type. For example, 'node', 'comment', or 'user'. If no
 *   type is specified, only 'global' site-wide substitution tokens are
 *   built.
 * @param $object
 *   (optional) An object to use for building substitution values (e.g. a node
 *   comment, or user object).
 * @param $flush
 *   (optional) A flag indicating whether or not to flush the token cache.
 *   Useful for processes that need to slog through huge numbers of tokens
 *   in a single execution cycle. Flushing it will keep them from burning
 *   through memory. Defaults to FALSE.
 * @param $options
 *   (optional) A keyed array of settings and flags to control the token
 *   generation process.
 *
 * @return
 *   An object with two properties:
 *   - tokens: All the possible tokens names generated.
 *   - values: The corresponding values for the tokens.
 *
 * Note that before performing actual token replacement that the token names
 * should be run through token_prepare_tokens().
 */
function token_get_values($type = 'global', $object = NULL, $flush = FALSE, $options = array()) {
  static $tokens;
  static $running;

  // Flush the static token cache. Useful for processes that need to slog through
  // huge numbers of tokens in a single execution cycle. Flushing it will keep
  // them from burning through memory.
  if ($flush || !isset($tokens)) {
    $tokens = array();
  }

  // Since objects in PHP5 are always passed by reference, we ensure we're
  // working on a copy of the object.
  if (is_object($object)) {
    $object = drupal_clone($object);
  }

  // Simple recursion check. This is to avoid content_view()'s potential
  // for endless looping when a filter uses tokens, which load the content
  // view, which calls the filter, which uses tokens, which...
  if ($running) {
    // We'll allow things to get two levels deep, but bail out after that
    // without performing any substitutions.
    $result = new stdClass();
    $result->tokens = array();
    $result->values = array();
    return $result;
  }

  $running = TRUE;

  token_include();

  $id = _token_get_id($type, $object);
  if ($id && isset($tokens[$type][$id])) {
    $tmp_tokens = $tokens[$type][$id];
  }
  else {
    $tmp_tokens = module_invoke_all('token_values', $type, $object, $options);
    $tokens[$type][$id] = $tmp_tokens;
  }

  // Special-case global tokens, as we always want to be able to process
  // those substitutions.
  if (!isset($tokens['global']['default'])) {
    $tokens['global']['default'] = module_invoke_all('token_values', 'global');
  }

  $all = array_merge($tokens['global']['default'], $tokens[$type][$id]);

  $result = new stdClass();
  $result->tokens = array_keys($all);
  $result->values = array_values($all);

  $running = FALSE;

  return $result;
}

/**
 * A helper function that retrieves all currently exposed tokens,
 * and merges them recursively. This is only necessary when building
 * the token listing -- during actual value replacement, only tokens
 * in a particular domain are requested and a normal array_marge() is
 * sufficient.
 *
 * @param $types
 *   A flag indicating the class of substitution tokens to use. If an
 *   object is passed in the second param, 'types' should contain the
 *   object's type. For example, 'node', 'comment', or 'user'. 'types'
 *   may also be an array of types of the form array('node','user'). If no
 *   type is specified, only 'global' site-wide substitution tokens are
 *   built.
 *
 * @return
 *   The array of usable tokens and their descriptions, organized by
 *   token type.
 */
function token_get_list($types = 'all') {
  token_include();
  $return = array();
  settype($types, 'array');
  foreach (module_implements('token_list') as $module) {
    foreach ($types as $type) {
      $module_token_list = module_invoke($module, 'token_list', $type);
      if (isset($module_token_list) && is_array($module_token_list)) {
        foreach ($module_token_list as $category => $tokens) {
          foreach ($tokens as $token => $title) {
            // Automatically append a raw token warning.
            if (substr($token, -4) === '-raw' && strpos($title, t('raw user input')) === FALSE && strpos($title, '1269441371') === FALSE) {
              $title .= ' <em>' . t('Warning: Token value contains raw user input.') . '</em>';
            }
            $return[$category][$token] = $title;
          }
        }
      }
    }
  }
  return $return;
}

/**
 * A helper function to prepare raw tokens for replacement.
 *
 * @param $tokens
 *   The array of tokens names with no delimiting characters.
 * @param $leading
 *   String to prepend to the token. Default is TOKEN_PREFIX.
 * @param $trailing
 *   String to append to the token. Default is TOKEN_SUFFIX.
 *
 * @return
 *   An array of the formatted tokens.
 */
function token_prepare_tokens($tokens = array(), $leading = TOKEN_PREFIX, $trailing = TOKEN_SUFFIX) {
  foreach ($tokens as $key => $value) {
    $tokens[$key] = $leading . $value . $trailing;
  }
  return $tokens;
}

/**
 * A helper function to return an object's ID for use in static caching.
 */
function _token_get_id($type = 'global', $object = NULL) {
  if (!isset($object)) {
    return "default";
  }
  switch ($type) {
    case 'node':
      return isset($object->nid) ? $object->nid : 0;
    case 'comment':
      return isset($object->cid) ? $object->cid : 0;
    case 'user':
      return isset($object->uid) ? $object->uid : 0;
    case 'taxonomy':
      return isset($object->tid) ? $object->tid : 0;
    default:
      return crc32(serialize($object));
  }
}

/**
 * Build a list of common date tokens for use in hook_token_list().
 *
 * @param $description
 */
function token_get_date_token_info($description, $token_prefix = '') {
  $tokens[$token_prefix . 'small']  = t("!description date in 'small' format. <em>(06/07/2010 - 23:28)</em>", array('!description' => $description));
  $tokens[$token_prefix . 'yyyy']   = t("!description year (four digit)", array('!description' => $description));
  $tokens[$token_prefix . 'yy']     = t("!description year (two digit)", array('!description' => $description));
  $tokens[$token_prefix . 'month']  = t("!description month (full word)", array('!description' => $description));
  $tokens[$token_prefix . 'mon']    = t("!description month (abbreviated)", array('!description' => $description));
  $tokens[$token_prefix . 'mm']     = t("!description month (two digits with leading zeros)", array('!description' => $description));
  $tokens[$token_prefix . 'm']      = t("!description month (one or two digits without leading zeros)", array('!description' => $description));
  $tokens[$token_prefix . 'ww']     = t("!description week (two digits with leading zeros)", array('!description' => $description));
  if (version_compare(PHP_VERSION, '5.1.0', '>=')) {
    $tokens[$token_prefix . 'date'] = t("!description date (numeric representation of the day of the week)", array('!description' => $description));
  }
  $tokens[$token_prefix . 'day']    = t("!description day (full word)", array('!description' => $description));
  $tokens[$token_prefix . 'ddd']    = t("!description day (abbreviation)", array('!description' => $description));
  $tokens[$token_prefix . 'dd']     = t("!description day (two digits with leading zeros)", array('!description' => $description));
  $tokens[$token_prefix . 'd']      = t("!description day (one or two digits without leading zeros)", array('!description' => $description));
  $tokens[$token_prefix . 'raw']    = t("!description in UNIX timestamp format (1269441371)", array('!description' => $description));
  $tokens[$token_prefix . 'since']  = t("!description in 'time-since' format. (40 years 3 months)", array('!description' => $description));
  return $tokens;
}

/**
 * Build a list of common date tokens for use in hook_token_values().
 *
 * @param $description
 */
function token_get_date_token_values($timestamp = NULL, $token_prefix = '') {
  $tokens = array();
  $time = time();
  if (!isset($timestamp)) {
    $timestamp = $time;
  }
  $timezone = variable_get('date_default_timezone', 0);

  $formats = array(
    'yyyy' => 'Y',
    'yy' => 'y',
    'month' => 'F',
    'mon' => 'M',
    'mm' => 'm',
    'm' => 'n',
    'ww' => 'W',
    //'date' => 'N', // Provided later since it is PHP 5.1 only.
    'day' => 'l',
    'ddd' => 'D',
    'dd' => 'd',
    'd' => 'j',
  );
  foreach ($formats as $token => $format) {
    $tokens[$token_prefix . $token] = format_date($timestamp, 'custom', $format, $timezone);
  }

  $tokens[$token_prefix . 'small'] = format_date($timestamp, 'small', '', $timezone);
  $tokens[$token_prefix . 'raw'] = $timestamp;
  $tokens[$token_prefix . 'since'] = format_interval($time - $timestamp);

  $timestamp += $timezone;
  if (version_compare(PHP_VERSION, '5.1.0', '>=')) {
    $tokens[$token_prefix . 'date'] = gmdate('N', $timestamp);
  }

  return $tokens;
}

/**
 * Validate an tokens in raw text based on possible contexts.
 *
 * @param $text
 *   A string with the raw text containing the raw tokens.
 * @param $valid_types
 *   An array of token types to validage against.
 * @param $leading
 *   Character(s) to prepend to the token key before searching for
 *   matches. Defaults to TOKEN_PREFIX.
 * @param $trailing
 *   Character(s) to append to the token key before searching for
 *   matches. Defaults to TOKEN_SUFFIX.
 *
 * @return
 *   An array with the invalid tokens in their original raw forms.
 */
function token_get_invalid_tokens_by_context($text, $valid_types = array(), $leading = TOKEN_PREFIX, $trailing = TOKEN_SUFFIX) {
  // Add the token types that are always valid in global context.
  $valid_types[] = 'global';

  $invalid_tokens = array();
  $valid_tokens = token_get_list($valid_types);
  foreach (token_scan($text, $leading, $trailing) as $token) {
    $found = FALSE;
    foreach ($valid_tokens as $category => $tokens) {
      if (isset($tokens[$token])) {
        $found = TRUE;
        break;
      }
      elseif (preg_match('/^(.*[_-])\d+$/', $token, $result)) {
        // Some modules use a 'wildcard' token, e.g. Location.module defines
        // [location-country_N] but users actually use [location-country_0].
        // If the token has a digit on the end and there is a 'wildcard'
        // token definition, we should allow it.
        if (isset($tokens[$result[1] . 'N']) || isset($tokens[$result[1] . '?'])) {
          $found = TRUE;
          break;
        }
      }
    }
    if (!$found) {
      $invalid_tokens[] = $token;
    }
  }

  array_unique($invalid_tokens);
  $invalid_tokens = token_prepare_tokens($invalid_tokens, $leading, $trailing);
  return $invalid_tokens;
}

/**
 * Build a list of all token-like patterns that appear in the text.
 *
 * @param $text
 *   The text to be scanned for possible tokens.
 * @param $leading
 *   Character(s) to prepend to the token key before searching for
 *   matches. Defaults to TOKEN_PREFIX.
 * @param $trailing
 *   Character(s) to append to the token key before searching for
 *   matches. Defaults to TOKEN_SUFFIX.
 *
 * @return
 *   An array of discovered tokens.
 */
function token_scan($text, $leading = TOKEN_PREFIX, $trailing = TOKEN_SUFFIX) {
  // Matches tokens with the following pattern: [$token]
  $leading = preg_quote($leading, '/');
  $trailing = preg_quote($trailing, '/');
  preg_match_all("/{$leading}([^\s]+?){$trailing}/", $text, $matches);
  return $matches[1];
}

/**
 * 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
 * $form['my_node_text_element'] = array(
 *   '#type' => 'textfield',
 *   '#title' => t('Some text to token-ize that has a node context.'),
 *   '#default_value' => 'The title of this node is [node:title].',
 *   '#element_validate' => array('token_element_validate_token_context'),
 *   '#token_types' => array('node'),
 * );
 * @endcode
 */
function token_element_validate_token_context(&$element, &$form_state) {
  $value = isset($element['#value']) ? $element['#value'] : $element['#default_value'];
  $invalid_tokens = token_get_invalid_tokens_by_context($value, $element['#token_types']);
  if ($invalid_tokens) {
    form_error($element, t('The %element-title is using the following invalid tokens: @invalid-tokens.', array('%element-title' => $element['#title'], '@invalid-tokens' => implode(', ', $invalid_tokens))));
  }
  return $element;
}

/**
 * Find tokens that have been declared twice by different modules.
 */
function token_find_duplicate_tokens() {
  token_include();
  $all_tokens = array();

  foreach (module_implements('token_list') as $module) {
    $module_token_list = module_invoke($module, 'token_list', 'all');
    if (!isset($module_token_list) || !is_array($module_token_list)) {
      // Skip modules that do not return an array as that is a valid return
      // value.
      continue;
    }
    if (in_array($module, _token_core_supported_modules())) {
      $module = 'token';
    }
    foreach ($module_token_list as $type => $tokens) {
      foreach (array_keys($tokens) as $token) {
        $all_tokens[$type . ':' . $token][] = $module;
      }
    }
  }

  foreach ($all_tokens as $token => $modules) {
    if (count($modules) < 2) {
      unset($all_tokens[$token]);
    }
  }

  return $all_tokens;
}

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