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<?php
// $Id: path.inc,v 1.19 2007/11/04 16:42:45 goba Exp $
/**
* @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 one of its aliases if such a one exists. Otherwise,
* return FALSE.
*
* @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.
* @param $path_language
* Optional language code to search the path with. Defaults to the page language.
* If there's no path defined for that language it will search paths without
* language.
*
* @return
* Either a Drupal system path, an aliased path, or FALSE if no path was
* found.
*/
function drupal_lookup_path($action, $path = '', $path_language = '') {
global $language;
// $map is an array with language keys, holding arrays of Drupal paths to alias relations
static $map = array(), $no_src = array(), $count;
$path_language = $path_language ? $path_language : $language->language;
// Use $count to avoid looking up paths in subsequent calls if there simply are no aliases
if (!isset($count)) {
$count = db_result(db_query('SELECT COUNT(pid) FROM {url_alias}'));
}
if ($action == 'wipe') {
$map = array();
$no_src = array();
}
elseif ($count > 0 && $path != '') {
if ($action == 'alias') {
if (isset($map[$path_language][$path])) {
return $map[$path_language][$path];
}
// Get the most fitting result falling back with alias without language
$alias = db_result(db_query("SELECT dst FROM {url_alias} WHERE src = '%s' AND language IN('%s', '') ORDER BY language DESC", $path, $path_language));
$map[$path_language][$path] = $alias;
return $alias;
}
// Check $no_src for this $path in case we've already determined that there
// isn't a path that has this alias
elseif ($action == 'source' && !isset($no_src[$path_language][$path])) {
// Look for the value $path within the cached $map
$src = '';
if (!isset($map[$path_language]) || !($src = array_search($path, $map[$path_language]))) {
// Get the most fitting result falling back with alias without language
if ($src = db_result(db_query("SELECT src FROM {url_alias} WHERE dst = '%s' AND language IN('%s', '') ORDER BY language DESC", $path, $path_language))) {
$map[$path_language][$src] = $path;
}
else {
// We can't record anything into $map because we do not have a valid
// index and there is no need because we have not learned anything
// about any Drupal path. Thus cache to $no_src.
$no_src[$path_language][$path] = TRUE;
}
}
return $src;
}
}
return FALSE;
}
/**
* Given an internal Drupal path, return the alias set by the administrator.
*
* @param $path
* An internal Drupal path.
* @param $path_language
* An optional language code to look up the path in.
*
* @return
* An aliased path if one was found, or the original path if no alias was
* found.
*/
function drupal_get_path_alias($path, $path_language = '') {
$result = $path;
if ($alias = drupal_lookup_path('alias', $path, $path_language)) {
$result = $alias;
}
return $result;
}
/**
* Given a path alias, return the internal path it represents.
*
* @param $path
* A Drupal path alias.
* @param $path_language
* An optional language code to look up the path in.
*
* @return
* The internal path represented by the alias, or the original alias if no
* internal path was found.
*/
function drupal_get_normal_path($path, $path_language = '') {
$result = $path;
if ($src = drupal_lookup_path('source', $path, $path_language)) {
$result = $src;
}
if (function_exists('custom_url_rewrite_inbound')) {
// Modules may alter the inbound request path by reference.
custom_url_rewrite_inbound($result, $path, $path_language);
}
return $result;
}
/**
* Return a component of the current Drupal path.
*
* When viewing a page at the path "admin/content/types", for example, arg(0)
* would return "admin", arg(1) would return "content", and arg(2) would return
* "types".
*
* 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 $index, or NULL if the specified component was
* not found.
*/
function arg($index = NULL, $path = NULL) {
static $arguments;
if (!isset($path)) {
$path = $_GET['q'];
}
if (!isset($arguments[$path])) {
$arguments[$path] = explode('/', $path);
}
if (!isset($index)) {
return $arguments[$path];
}
if (isset($arguments[$path][$index])) {
return $arguments[$path][$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;
}
/**
* Check if the current page is the front page.
*
* @return
* Boolean value: TRUE if the current page is the front page; FALSE if otherwise.
*/
function drupal_is_front_page() {
// As drupal_init_path updates $_GET['q'] with the 'site_frontpage' path,
// we can check it against the 'site_frontpage' variable.
return $_GET['q'] == drupal_get_normal_path(variable_get('site_frontpage', 'node'));
}
/**
* Check if a path matches any pattern in a set of patterns.
*
* @param $path
* The path to match.
* @param $patterns
* String containing a set of patterns separated by \n, \r or \r\n.
*
* @return
* Boolean value: TRUE if the path matches a pattern, FALSE otherwise.
*/
function drupal_match_path($path, $patterns) {
static $regexps;
if (!isset($regexps[$patterns])) {
$regexps[$patterns] = '/^('. preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/', '/(^|\|)\\\\<front\\\\>($|\|)/'), array('|', '.*', '\1'. preg_quote(variable_get('site_frontpage', 'node'), '/') .'\2'), preg_quote($patterns, '/')) .')$/';
}
return preg_match($regexps[$patterns], $path);
}
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