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<?php
// $Id$
/**
* @file
* Functions to handle paths in Drupal, including path aliasing.
*
* These functions are not loaded for cached pages, but modules that need
* to use them in hook_init() or hook exit() can make them available, by
* executing "drupal_bootstrap(DRUPAL_BOOTSTRAP_PATH);".
*/
/**
* Initialize the $_GET['q'] variable to the proper normal path.
*/
function drupal_init_path() {
if (!empty($_GET['q'])) {
$_GET['q'] = drupal_get_normal_path(trim($_GET['q'], '/'));
}
else {
$_GET['q'] = drupal_get_normal_path(variable_get('site_frontpage', 'node'));
}
}
/**
* Given an alias, return its Drupal system URL if one exists. Given a Drupal
* system URL return its alias if one exists.
*
* @param $action
* One of the following values:
* - wipe: delete the alias cache.
* - alias: return an alias for a given Drupal system path (if one exists).
* - source: return the Drupal system URL for a path alias (if one exists).
* @param $path
* The path to investigate for corresponding aliases or system URLs.
*
* @return
* Either a Drupal system path, an aliased path, or FALSE if no path was
* found.
*/
function drupal_lookup_path($action, $path = '') {
static $map = array();
static $count = NULL;
if ($count === NULL) {
$count = db_result(db_query('SELECT COUNT(pid) FROM {url_alias}'));
}
if ($action == 'wipe') {
$map = array();
}
elseif ($count > 0 && $path != '') {
if ($action == 'alias') {
if (isset($map[$path])) {
return $map[$path];
}
if ($alias = db_result(db_query("SELECT dst FROM {url_alias} WHERE src = '%s'", $path))) {
$map[$path] = $alias;
return $alias;
}
else {
$map[$path] = $path;
}
}
elseif ($action == 'source') {
if ($alias = array_search($path, $map)) {
return $alias;
}
if (!isset($map[$path])) {
if ($src = db_result(db_query("SELECT src FROM {url_alias} WHERE dst = '%s'", $path))) {
$map[$src] = $path;
return $src;
}
}
}
}
return FALSE;
}
/**
* Given an internal Drupal path, return the alias set by the administrator.
*
* @param $path
* An internal Drupal path.
*
* @return
* An aliased path if one was found, or the original path if no alias was
* found.
*/
function drupal_get_path_alias($path) {
$result = $path;
if ($alias = drupal_lookup_path('alias', $path)) {
$result = $alias;
}
if (function_exists('custom_url_rewrite')) {
$result = custom_url_rewrite('alias', $result, $path);
}
return $result;
}
/**
* Given a path alias, return the internal path it represents.
*
* @param $path
* A Drupal path alias.
*
* @return
* The internal path represented by the alias, or the original alias if no
* internal path was found.
*/
function drupal_get_normal_path($path) {
$result = $path;
if ($src = drupal_lookup_path('source', $path)) {
$result = $src;
}
if (function_exists('custom_url_rewrite')) {
$result = custom_url_rewrite('source', $result, $path);
}
return $result;
}
/**
* Return a component of the current Drupal path.
*
* When viewing a page at the path "admin/node/configure", for example, arg(0)
* would return "admin", arg(1) would return "node", and arg(2) would return
* "configure".
*
* Avoid use of this function where possible, as resulting code is hard to read.
* Instead, attempt to use named arguments in menu callback functions. See the
* explanation in menu.inc for how to construct callbacks that take arguments.
*
* @param $index
* The index of the component, where each component is separated by a '/'
* (forward-slash), and where the first component has an index of 0 (zero).
*
* @return
* The component specified by $index, or FALSE if the specified component was
* not found.
*/
function arg($index) {
static $arguments, $q;
if (empty($arguments) || $q != $_GET['q']) {
$arguments = explode('/', $_GET['q']);
$q = $_GET['q'];
}
if (isset($arguments[$index])) {
return $arguments[$index];
}
}
/**
* Get the title of the current page, for display on the page and in the title bar.
*
* @return
* The current page's title.
*/
function drupal_get_title() {
$title = drupal_set_title();
// during a bootstrap, menu.inc is not included and thus we cannot provide a title
if (!isset($title) && function_exists('menu_get_active_title')) {
$title = check_plain(menu_get_active_title());
}
return $title;
}
/**
* Set the title of the current page, for display on the page and in the title bar.
*
* @param $title
* Optional string value to assign to the page title; or if set to NULL
* (default), leaves the current title unchanged.
*
* @return
* The updated title of the current page.
*/
function drupal_set_title($title = NULL) {
static $stored_title;
if (isset($title)) {
$stored_title = $title;
}
return $stored_title;
}
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