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+<?php
+
+/**
+ * @file
+ * Common functions that many Drupal modules will need to reference.
+ *
+ * The functions that are critical and need to be available even when serving
+ * a cached page are instead located in bootstrap.inc.
+ */
+
+/**
+ * @defgroup php_wrappers PHP wrapper functions
+ * @{
+ * Functions that are wrappers or custom implementations of PHP functions.
+ *
+ * Certain PHP functions should not be used in Drupal. Instead, Drupal's
+ * replacement functions should be used.
+ *
+ * For example, for improved or more secure UTF8-handling, or RFC-compliant
+ * handling of URLs in Drupal.
+ *
+ * For ease of use and memorizing, all these wrapper functions use the same name
+ * as the original PHP function, but prefixed with "drupal_". Beware, however,
+ * that not all wrapper functions support the same arguments as the original
+ * functions.
+ *
+ * You should always use these wrapper functions in your code.
+ *
+ * Wrong:
+ * @code
+ * $my_substring = substr($original_string, 0, 5);
+ * @endcode
+ *
+ * Correct:
+ * @code
+ * $my_substring = drupal_substr($original_string, 0, 5);
+ * @endcode
+ *
+ * @}
+ */
+
+/**
+ * Return status for saving which involved creating a new item.
+ */
+define('SAVED_NEW', 1);
+
+/**
+ * Return status for saving which involved an update to an existing item.
+ */
+define('SAVED_UPDATED', 2);
+
+/**
+ * Return status for saving which deleted an existing item.
+ */
+define('SAVED_DELETED', 3);
+
+/**
+ * The default group for system CSS files added to the page.
+ */
+define('CSS_SYSTEM', -100);
+
+/**
+ * The default group for module CSS files added to the page.
+ */
+define('CSS_DEFAULT', 0);
+
+/**
+ * The default group for theme CSS files added to the page.
+ */
+define('CSS_THEME', 100);
+
+/**
+ * The default group for JavaScript and jQuery libraries added to the page.
+ */
+define('JS_LIBRARY', -100);
+
+/**
+ * The default group for module JavaScript code added to the page.
+ */
+define('JS_DEFAULT', 0);
+
+/**
+ * The default group for theme JavaScript code added to the page.
+ */
+define('JS_THEME', 100);
+
+/**
+ * Error code indicating that the request exceeded the specified timeout.
+ *
+ * @see drupal_http_request()
+ */
+define('HTTP_REQUEST_TIMEOUT', -1);
+
+/**
+ * @defgroup block_caching Block Caching
+ * @{
+ * Constants that define each block's caching state.
+ *
+ * Modules specify how their blocks can be cached in their hook_block_info()
+ * implementations. Caching can be turned off (DRUPAL_NO_CACHE), managed by the
+ * module declaring the block (DRUPAL_CACHE_CUSTOM), or managed by the core
+ * Block module. If the Block module is managing the cache, you can specify that
+ * the block is the same for every page and user (DRUPAL_CACHE_GLOBAL), or that
+ * it can change depending on the page (DRUPAL_CACHE_PER_PAGE) or by user
+ * (DRUPAL_CACHE_PER_ROLE or DRUPAL_CACHE_PER_USER). Page and user settings can
+ * be combined with a bitwise-binary or operator; for example,
+ * DRUPAL_CACHE_PER_ROLE | DRUPAL_CACHE_PER_PAGE means that the block can change
+ * depending on the user role or page it is on.
+ *
+ * The block cache is cleared in cache_clear_all(), and uses the same clearing
+ * policy than page cache (node, comment, user, taxonomy added or updated...).
+ * Blocks requiring more fine-grained clearing might consider disabling the
+ * built-in block cache (DRUPAL_NO_CACHE) and roll their own.
+ *
+ * Note that user 1 is excluded from block caching.
+ */
+
+/**
+ * The block should not get cached.
+ *
+ * This setting should be used:
+ * - For simple blocks (notably those that do not perform any db query), where
+ * querying the db cache would be more expensive than directly generating the
+ * content.
+ * - For blocks that change too frequently.
+ */
+define('DRUPAL_NO_CACHE', -1);
+
+/**
+ * The block is handling its own caching in its hook_block_view().
+ *
+ * This setting is useful when time based expiration is needed or a site uses a
+ * node access which invalidates standard block cache.
+ */
+define('DRUPAL_CACHE_CUSTOM', -2);
+
+/**
+ * The block or element can change depending on the user's roles.
+ *
+ * This is the default setting for blocks, used when the block does not specify
+ * anything.
+ */
+define('DRUPAL_CACHE_PER_ROLE', 0x0001);
+
+/**
+ * The block or element can change depending on the user.
+ *
+ * This setting can be resource-consuming for sites with large number of users,
+ * and thus should only be used when DRUPAL_CACHE_PER_ROLE is not sufficient.
+ */
+define('DRUPAL_CACHE_PER_USER', 0x0002);
+
+/**
+ * The block or element can change depending on the page being viewed.
+ */
+define('DRUPAL_CACHE_PER_PAGE', 0x0004);
+
+/**
+ * The block or element is the same for every user and page that it is visible.
+ */
+define('DRUPAL_CACHE_GLOBAL', 0x0008);
+
+/**
+ * @} End of "defgroup block_caching".
+ */
+
+/**
+ * Adds content to a specified region.
+ *
+ * @param $region
+ * Page region the content is added to.
+ * @param $data
+ * Content to be added.
+ */
+function drupal_add_region_content($region = NULL, $data = NULL) {
+ static $content = array();
+
+ if (isset($region) && isset($data)) {
+ $content[$region][] = $data;
+ }
+ return $content;
+}
+
+/**
+ * Gets assigned content for a given region.
+ *
+ * @param $region
+ * A specified region to fetch content for. If NULL, all regions will be
+ * returned.
+ * @param $delimiter
+ * Content to be inserted between imploded array elements.
+ */
+function drupal_get_region_content($region = NULL, $delimiter = ' ') {
+ $content = drupal_add_region_content();
+ if (isset($region)) {
+ if (isset($content[$region]) && is_array($content[$region])) {
+ return implode($delimiter, $content[$region]);
+ }
+ }
+ else {
+ foreach (array_keys($content) as $region) {
+ if (is_array($content[$region])) {
+ $content[$region] = implode($delimiter, $content[$region]);
+ }
+ }
+ return $content;
+ }
+}
+
+/**
+ * Gets the name of the currently active installation profile.
+ *
+ * When this function is called during Drupal's initial installation process,
+ * the name of the profile that's about to be installed is stored in the global
+ * installation state. At all other times, the standard Drupal systems variable
+ * table contains the name of the current profile, and we can call
+ * variable_get() to determine what one is active.
+ *
+ * @return $profile
+ * The name of the installation profile.
+ */
+function drupal_get_profile() {
+ global $install_state;
+
+ if (isset($install_state['parameters']['profile'])) {
+ $profile = $install_state['parameters']['profile'];
+ }
+ else {
+ $profile = variable_get('install_profile', 'standard');
+ }
+
+ return $profile;
+}
+
+
+/**
+ * Sets the breadcrumb trail for the current page.
+ *
+ * @param $breadcrumb
+ * Array of links, starting with "home" and proceeding up to but not including
+ * the current page.
+ */
+function drupal_set_breadcrumb($breadcrumb = NULL) {
+ $stored_breadcrumb = &drupal_static(__FUNCTION__);
+
+ if (isset($breadcrumb)) {
+ $stored_breadcrumb = $breadcrumb;
+ }
+ return $stored_breadcrumb;
+}
+
+/**
+ * Gets the breadcrumb trail for the current page.
+ */
+function drupal_get_breadcrumb() {
+ $breadcrumb = drupal_set_breadcrumb();
+
+ if (!isset($breadcrumb)) {
+ $breadcrumb = menu_get_active_breadcrumb();
+ }
+
+ return $breadcrumb;
+}
+
+/**
+ * Returns a string containing RDF namespace declarations for use in XML and
+ * XHTML output.
+ */
+function drupal_get_rdf_namespaces() {
+ $xml_rdf_namespaces = array();
+
+ // Serializes the RDF namespaces in XML namespace syntax.
+ if (function_exists('rdf_get_namespaces')) {
+ foreach (rdf_get_namespaces() as $prefix => $uri) {
+ $xml_rdf_namespaces[] = 'xmlns:' . $prefix . '="' . $uri . '"';
+ }
+ }
+ return count($xml_rdf_namespaces) ? "\n " . implode("\n ", $xml_rdf_namespaces) : '';
+}
+
+/**
+ * Adds output to the HEAD tag of the HTML page.
+ *
+ * This function can be called as long as the headers aren't sent. Pass no
+ * arguments (or NULL for both) to retrieve the currently stored elements.
+ *
+ * @param $data
+ * A renderable array. If the '#type' key is not set then 'html_tag' will be
+ * added as the default '#type'.
+ * @param $key
+ * A unique string key to allow implementations of hook_html_head_alter() to
+ * identify the element in $data. Required if $data is not NULL.
+ *
+ * @return
+ * An array of all stored HEAD elements.
+ *
+ * @see theme_html_tag()
+ */
+function drupal_add_html_head($data = NULL, $key = NULL) {
+ $stored_head = &drupal_static(__FUNCTION__);
+
+ if (!isset($stored_head)) {
+ // Make sure the defaults, including Content-Type, come first.
+ $stored_head = _drupal_default_html_head();
+ }
+
+ if (isset($data) && isset($key)) {
+ if (!isset($data['#type'])) {
+ $data['#type'] = 'html_tag';
+ }
+ $stored_head[$key] = $data;
+ }
+ return $stored_head;
+}
+
+/**
+ * Returns elements that are always displayed in the HEAD tag of the HTML page.
+ */
+function _drupal_default_html_head() {
+ // Add default elements. Make sure the Content-Type comes first because the
+ // IE browser may be vulnerable to XSS via encoding attacks from any content
+ // that comes before this META tag, such as a TITLE tag.
+ $elements['system_meta_content_type'] = array(
+ '#type' => 'html_tag',
+ '#tag' => 'meta',
+ '#attributes' => array(
+ 'http-equiv' => 'Content-Type',
+ 'content' => 'text/html; charset=utf-8',
+ ),
+ // Security: This always has to be output first.
+ '#weight' => -1000,
+ );
+ // Show Drupal and the major version number in the META GENERATOR tag.
+ // Get the major version.
+ list($version, ) = explode('.', VERSION);
+ $elements['system_meta_generator'] = array(
+ '#type' => 'html_tag',
+ '#tag' => 'meta',
+ '#attributes' => array(
+ 'name' => 'Generator',
+ 'content' => 'Drupal ' . $version . ' (http://drupal.org)',
+ ),
+ );
+ // Also send the generator in the HTTP header.
+ $elements['system_meta_generator']['#attached']['drupal_add_http_header'][] = array('X-Generator', $elements['system_meta_generator']['#attributes']['content']);
+ return $elements;
+}
+
+/**
+ * Retrieves output to be displayed in the HEAD tag of the HTML page.
+ */
+function drupal_get_html_head() {
+ $elements = drupal_add_html_head();
+ drupal_alter('html_head', $elements);
+ return drupal_render($elements);
+}
+
+/**
+ * Adds a feed URL for the current page.
+ *
+ * This function can be called as long the HTML header hasn't been sent.
+ *
+ * @param $url
+ * An internal system path or a fully qualified external URL of the feed.
+ * @param $title
+ * The title of the feed.
+ */
+function drupal_add_feed($url = NULL, $title = '') {
+ $stored_feed_links = &drupal_static(__FUNCTION__, array());
+
+ if (isset($url)) {
+ $stored_feed_links[$url] = theme('feed_icon', array('url' => $url, 'title' => $title));
+
+ drupal_add_html_head_link(array(
+ 'rel' => 'alternate',
+ 'type' => 'application/rss+xml',
+ 'title' => $title,
+ // Force the URL to be absolute, for consistency with other <link> tags
+ // output by Drupal.
+ 'href' => url($url, array('absolute' => TRUE)),
+ ));
+ }
+ return $stored_feed_links;
+}
+
+/**
+ * Gets the feed URLs for the current page.
+ *
+ * @param $delimiter
+ * A delimiter to split feeds by.
+ */
+function drupal_get_feeds($delimiter = "\n") {
+ $feeds = drupal_add_feed();
+ return implode($feeds, $delimiter);
+}
+
+/**
+ * @defgroup http_handling HTTP handling
+ * @{
+ * Functions to properly handle HTTP responses.
+ */
+
+/**
+ * Processes a URL query parameter array to remove unwanted elements.
+ *
+ * @param $query
+ * (optional) An array to be processed. Defaults to $_GET.
+ * @param $exclude
+ * (optional) A list of $query array keys to remove. Use "parent[child]" to
+ * exclude nested items. Defaults to array('q').
+ * @param $parent
+ * Internal use only. Used to build the $query array key for nested items.
+ *
+ * @return
+ * An array containing query parameters, which can be used for url().
+ */
+function drupal_get_query_parameters(array $query = NULL, array $exclude = array('q'), $parent = '') {
+ // Set defaults, if none given.
+ if (!isset($query)) {
+ $query = $_GET;
+ }
+ // If $exclude is empty, there is nothing to filter.
+ if (empty($exclude)) {
+ return $query;
+ }
+ elseif (!$parent) {
+ $exclude = array_flip($exclude);
+ }
+
+ $params = array();
+ foreach ($query as $key => $value) {
+ $string_key = ($parent ? $parent . '[' . $key . ']' : $key);
+ if (isset($exclude[$string_key])) {
+ continue;
+ }
+
+ if (is_array($value)) {
+ $params[$key] = drupal_get_query_parameters($value, $exclude, $string_key);
+ }
+ else {
+ $params[$key] = $value;
+ }
+ }
+
+ return $params;
+}
+
+/**
+ * Splits a URL-encoded query string into an array.
+ *
+ * @param $query
+ * The query string to split.
+ *
+ * @return
+ * An array of URL decoded couples $param_name => $value.
+ */
+function drupal_get_query_array($query) {
+ $result = array();
+ if (!empty($query)) {
+ foreach (explode('&', $query) as $param) {
+ $param = explode('=', $param);
+ $result[$param[0]] = isset($param[1]) ? rawurldecode($param[1]) : '';
+ }
+ }
+ return $result;
+}
+
+/**
+ * Parses an array into a valid, rawurlencoded query string.
+ *
+ * This differs from http_build_query() as we need to rawurlencode() (instead of
+ * urlencode()) all query parameters.
+ *
+ * @param $query
+ * The query parameter array to be processed, e.g. $_GET.
+ * @param $parent
+ * Internal use only. Used to build the $query array key for nested items.
+ *
+ * @return
+ * A rawurlencoded string which can be used as or appended to the URL query
+ * string.
+ *
+ * @see drupal_get_query_parameters()
+ * @ingroup php_wrappers
+ */
+function drupal_http_build_query(array $query, $parent = '') {
+ $params = array();
+
+ foreach ($query as $key => $value) {
+ $key = ($parent ? $parent . '[' . rawurlencode($key) . ']' : rawurlencode($key));
+
+ // Recurse into children.
+ if (is_array($value)) {
+ $params[] = drupal_http_build_query($value, $key);
+ }
+ // If a query parameter value is NULL, only append its key.
+ elseif (!isset($value)) {
+ $params[] = $key;
+ }
+ else {
+ // For better readability of paths in query strings, we decode slashes.
+ $params[] = $key . '=' . str_replace('%2F', '/', rawurlencode($value));
+ }
+ }
+
+ return implode('&', $params);
+}
+
+/**
+ * Prepares a 'destination' URL query parameter for use with drupal_goto().
+ *
+ * Used to direct the user back to the referring page after completing a form.
+ * By default the current URL is returned. If a destination exists in the
+ * previous request, that destination is returned. As such, a destination can
+ * persist across multiple pages.
+ *
+ * @return
+ * An associative array containing the key:
+ * - destination: The path provided via the destination query string or, if
+ * not available, the current path.
+ *
+ * @see current_path()
+ * @see drupal_goto()
+ */
+function drupal_get_destination() {
+ $destination = &drupal_static(__FUNCTION__);
+
+ if (isset($destination)) {
+ return $destination;
+ }
+
+ if (isset($_GET['destination'])) {
+ $destination = array('destination' => $_GET['destination']);
+ }
+ else {
+ $path = $_GET['q'];
+ $query = drupal_http_build_query(drupal_get_query_parameters());
+ if ($query != '') {
+ $path .= '?' . $query;
+ }
+ $destination = array('destination' => $path);
+ }
+ return $destination;
+}
+
+/**
+ * Parses a system URL string into an associative array suitable for url().
+ *
+ * This function should only be used for URLs that have been generated by the
+ * system, such as via url(). It should not be used for URLs that come from
+ * external sources, or URLs that link to external resources.
+ *
+ * The returned array contains a 'path' that may be passed separately to url().
+ * For example:
+ * @code
+ * $options = drupal_parse_url($_GET['destination']);
+ * $my_url = url($options['path'], $options);
+ * $my_link = l('Example link', $options['path'], $options);
+ * @endcode
+ *
+ * This is required, because url() does not support relative URLs containing a
+ * query string or fragment in its $path argument. Instead, any query string
+ * needs to be parsed into an associative query parameter array in
+ * $options['query'] and the fragment into $options['fragment'].
+ *
+ * @param $url
+ * The URL string to parse, f.e. $_GET['destination'].
+ *
+ * @return
+ * An associative array containing the keys:
+ * - 'path': The path of the URL. If the given $url is external, this includes
+ * the scheme and host.
+ * - 'query': An array of query parameters of $url, if existent.
+ * - 'fragment': The fragment of $url, if existent.
+ *
+ * @see url()
+ * @see drupal_goto()
+ * @ingroup php_wrappers
+ */
+function drupal_parse_url($url) {
+ $options = array(
+ 'path' => NULL,
+ 'query' => array(),
+ 'fragment' => '',
+ );
+
+ // External URLs: not using parse_url() here, so we do not have to rebuild
+ // the scheme, host, and path without having any use for it.
+ if (strpos($url, '://') !== FALSE) {
+ // Split off everything before the query string into 'path'.
+ $parts = explode('?', $url);
+ $options['path'] = $parts[0];
+ // If there is a query string, transform it into keyed query parameters.
+ if (isset($parts[1])) {
+ $query_parts = explode('#', $parts[1]);
+ parse_str($query_parts[0], $options['query']);
+ // Take over the fragment, if there is any.
+ if (isset($query_parts[1])) {
+ $options['fragment'] = $query_parts[1];
+ }
+ }
+ }
+ // Internal URLs.
+ else {
+ // parse_url() does not support relative URLs, so make it absolute. E.g. the
+ // relative URL "foo/bar:1" isn't properly parsed.
+ $parts = parse_url('http://example.com/' . $url);
+ // Strip the leading slash that was just added.
+ $options['path'] = substr($parts['path'], 1);
+ if (isset($parts['query'])) {
+ parse_str($parts['query'], $options['query']);
+ }
+ if (isset($parts['fragment'])) {
+ $options['fragment'] = $parts['fragment'];
+ }
+ }
+ // The 'q' parameter contains the path of the current page if clean URLs are
+ // disabled. It overrides the 'path' of the URL when present, even if clean
+ // URLs are enabled, due to how Apache rewriting rules work.
+ if (isset($options['query']['q'])) {
+ $options['path'] = $options['query']['q'];
+ unset($options['query']['q']);
+ }
+
+ return $options;
+}
+
+/**
+ * Encodes a Drupal path for use in a URL.
+ *
+ * For aesthetic reasons slashes are not escaped.
+ *
+ * Note that url() takes care of calling this function, so a path passed to that
+ * function should not be encoded in advance.
+ *
+ * @param $path
+ * The Drupal path to encode.
+ */
+function drupal_encode_path($path) {
+ return str_replace('%2F', '/', rawurlencode($path));
+}
+
+/**
+ * Sends the user to a different page.
+ *
+ * This issues an on-site HTTP redirect. The function makes sure the redirected
+ * URL is formatted correctly.
+ *
+ * Usually the redirected URL is constructed from this function's input
+ * parameters. However you may override that behavior by setting a
+ * destination in either the $_REQUEST-array (i.e. by using
+ * the query string of an URI) This is used to direct the user back to
+ * the proper page after completing a form. For example, after editing
+ * a post on the 'admin/content'-page or after having logged on using the
+ * 'user login'-block in a sidebar. The function drupal_get_destination()
+ * can be used to help set the destination URL.
+ *
+ * Drupal will ensure that messages set by drupal_set_message() and other
+ * session data are written to the database before the user is redirected.
+ *
+ * This function ends the request; use it instead of a return in your menu
+ * callback.
+ *
+ * @param $path
+ * (optional) A Drupal path or a full URL, which will be passed to url() to
+ * compute the redirect for the URL.
+ * @param $options
+ * (optional) An associative array of additional URL options to pass to url().
+ * @param $http_response_code
+ * (optional) The HTTP status code to use for the redirection, defaults to
+ * 302. The valid values for 3xx redirection status codes are defined in
+ * @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3 RFC 2616 @endlink
+ * and the
+ * @link http://tools.ietf.org/html/draft-reschke-http-status-308-07 draft for the new HTTP status codes: @endlink
+ * - 301: Moved Permanently (the recommended value for most redirects).
+ * - 302: Found (default in Drupal and PHP, sometimes used for spamming search
+ * engines).
+ * - 303: See Other.
+ * - 304: Not Modified.
+ * - 305: Use Proxy.
+ * - 307: Temporary Redirect.
+ *
+ * @see drupal_get_destination()
+ * @see url()
+ */
+function drupal_goto($path = '', array $options = array(), $http_response_code = 302) {
+ // A destination in $_GET always overrides the function arguments.
+ // We do not allow absolute URLs to be passed via $_GET, as this can be an attack vector.
+ if (isset($_GET['destination']) && !url_is_external($_GET['destination'])) {
+ $destination = drupal_parse_url($_GET['destination']);
+ $path = $destination['path'];
+ $options['query'] = $destination['query'];
+ $options['fragment'] = $destination['fragment'];
+ }
+
+ drupal_alter('drupal_goto', $path, $options, $http_response_code);
+
+ // The 'Location' HTTP header must be absolute.
+ $options['absolute'] = TRUE;
+
+ $url = url($path, $options);
+
+ header('Location: ' . $url, TRUE, $http_response_code);
+
+ // The "Location" header sends a redirect status code to the HTTP daemon. In
+ // some cases this can be wrong, so we make sure none of the code below the
+ // drupal_goto() call gets executed upon redirection.
+ drupal_exit($url);
+}
+
+/**
+ * Delivers a "site is under maintenance" message to the browser.
+ *
+ * Page callback functions wanting to report a "site offline" message should
+ * return MENU_SITE_OFFLINE instead of calling drupal_site_offline(). However,
+ * functions that are invoked in contexts where that return value might not
+ * bubble up to menu_execute_active_handler() should call drupal_site_offline().
+ */
+function drupal_site_offline() {
+ drupal_deliver_page(MENU_SITE_OFFLINE);
+}
+
+/**
+ * Delivers a "page not found" error to the browser.
+ *
+ * Page callback functions wanting to report a "page not found" message should
+ * return MENU_NOT_FOUND instead of calling drupal_not_found(). However,
+ * functions that are invoked in contexts where that return value might not
+ * bubble up to menu_execute_active_handler() should call drupal_not_found().
+ */
+function drupal_not_found() {
+ drupal_deliver_page(MENU_NOT_FOUND);
+}
+
+/**
+ * Delivers an "access denied" error to the browser.
+ *
+ * Page callback functions wanting to report an "access denied" message should
+ * return MENU_ACCESS_DENIED instead of calling drupal_access_denied(). However,
+ * functions that are invoked in contexts where that return value might not
+ * bubble up to menu_execute_active_handler() should call
+ * drupal_access_denied().
+ */
+function drupal_access_denied() {
+ drupal_deliver_page(MENU_ACCESS_DENIED);
+}
+
+/**
+ * Performs an HTTP request.
+ *
+ * This is a flexible and powerful HTTP client implementation. Correctly
+ * handles GET, POST, PUT or any other HTTP requests. Handles redirects.
+ *
+ * @param $url
+ * A string containing a fully qualified URI.
+ * @param array $options
+ * (optional) An array that can have one or more of the following elements:
+ * - headers: An array containing request headers to send as name/value pairs.
+ * - method: A string containing the request method. Defaults to 'GET'.
+ * - data: A string containing the request body, formatted as
+ * 'param=value&param=value&...'. Defaults to NULL.
+ * - max_redirects: An integer representing how many times a redirect
+ * may be followed. Defaults to 3.
+ * - timeout: A float representing the maximum number of seconds the function
+ * call may take. The default is 30 seconds. If a timeout occurs, the error
+ * code is set to the HTTP_REQUEST_TIMEOUT constant.
+ * - context: A context resource created with stream_context_create().
+ *
+ * @return object
+ * An object that can have one or more of the following components:
+ * - request: A string containing the request body that was sent.
+ * - code: An integer containing the response status code, or the error code
+ * if an error occurred.
+ * - protocol: The response protocol (e.g. HTTP/1.1 or HTTP/1.0).
+ * - status_message: The status message from the response, if a response was
+ * received.
+ * - redirect_code: If redirected, an integer containing the initial response
+ * status code.
+ * - redirect_url: If redirected, a string containing the URL of the redirect
+ * target.
+ * - error: If an error occurred, the error message. Otherwise not set.
+ * - headers: An array containing the response headers as name/value pairs.
+ * HTTP header names are case-insensitive (RFC 2616, section 4.2), so for
+ * easy access the array keys are returned in lower case.
+ * - data: A string containing the response body that was received.
+ */
+function drupal_http_request($url, array $options = array()) {
+ // Allow an alternate HTTP client library to replace Drupal's default
+ // implementation.
+ $override_function = variable_get('drupal_http_request_function', FALSE);
+ if (!empty($override_function) && function_exists($override_function)) {
+ return $override_function($url, $options);
+ }
+
+ $result = new stdClass();
+
+ // Parse the URL and make sure we can handle the schema.
+ $uri = @parse_url($url);
+
+ if ($uri == FALSE) {
+ $result->error = 'unable to parse URL';
+ $result->code = -1001;
+ return $result;
+ }
+
+ if (!isset($uri['scheme'])) {
+ $result->error = 'missing schema';
+ $result->code = -1002;
+ return $result;
+ }
+
+ timer_start(__FUNCTION__);
+
+ // Merge the default options.
+ $options += array(
+ 'headers' => array(),
+ 'method' => 'GET',
+ 'data' => NULL,
+ 'max_redirects' => 3,
+ 'timeout' => 30.0,
+ 'context' => NULL,
+ );
+
+ // Merge the default headers.
+ $options['headers'] += array(
+ 'User-Agent' => 'Drupal (+http://drupal.org/)',
+ );
+
+ // stream_socket_client() requires timeout to be a float.
+ $options['timeout'] = (float) $options['timeout'];
+
+ // Use a proxy if one is defined and the host is not on the excluded list.
+ $proxy_server = variable_get('proxy_server', '');
+ if ($proxy_server && _drupal_http_use_proxy($uri['host'])) {
+ // Set the scheme so we open a socket to the proxy server.
+ $uri['scheme'] = 'proxy';
+ // Set the path to be the full URL.
+ $uri['path'] = $url;
+ // Since the URL is passed as the path, we won't use the parsed query.
+ unset($uri['query']);
+
+ // Add in username and password to Proxy-Authorization header if needed.
+ if ($proxy_username = variable_get('proxy_username', '')) {
+ $proxy_password = variable_get('proxy_password', '');
+ $options['headers']['Proxy-Authorization'] = 'Basic ' . base64_encode($proxy_username . (!empty($proxy_password) ? ":" . $proxy_password : ''));
+ }
+ // Some proxies reject requests with any User-Agent headers, while others
+ // require a specific one.
+ $proxy_user_agent = variable_get('proxy_user_agent', '');
+ // The default value matches neither condition.
+ if ($proxy_user_agent === NULL) {
+ unset($options['headers']['User-Agent']);
+ }
+ elseif ($proxy_user_agent) {
+ $options['headers']['User-Agent'] = $proxy_user_agent;
+ }
+ }
+
+ switch ($uri['scheme']) {
+ case 'proxy':
+ // Make the socket connection to a proxy server.
+ $socket = 'tcp://' . $proxy_server . ':' . variable_get('proxy_port', 8080);
+ // The Host header still needs to match the real request.
+ $options['headers']['Host'] = $uri['host'];
+ $options['headers']['Host'] .= isset($uri['port']) && $uri['port'] != 80 ? ':' . $uri['port'] : '';
+ break;
+
+ case 'http':
+ case 'feed':
+ $port = isset($uri['port']) ? $uri['port'] : 80;
+ $socket = 'tcp://' . $uri['host'] . ':' . $port;
+ // RFC 2616: "non-standard ports MUST, default ports MAY be included".
+ // We don't add the standard port to prevent from breaking rewrite rules
+ // checking the host that do not take into account the port number.
+ $options['headers']['Host'] = $uri['host'] . ($port != 80 ? ':' . $port : '');
+ break;
+
+ case 'https':
+ // Note: Only works when PHP is compiled with OpenSSL support.
+ $port = isset($uri['port']) ? $uri['port'] : 443;
+ $socket = 'ssl://' . $uri['host'] . ':' . $port;
+ $options['headers']['Host'] = $uri['host'] . ($port != 443 ? ':' . $port : '');
+ break;
+
+ default:
+ $result->error = 'invalid schema ' . $uri['scheme'];
+ $result->code = -1003;
+ return $result;
+ }
+
+ if (empty($options['context'])) {
+ $fp = @stream_socket_client($socket, $errno, $errstr, $options['timeout']);
+ }
+ else {
+ // Create a stream with context. Allows verification of a SSL certificate.
+ $fp = @stream_socket_client($socket, $errno, $errstr, $options['timeout'], STREAM_CLIENT_CONNECT, $options['context']);
+ }
+
+ // Make sure the socket opened properly.
+ if (!$fp) {
+ // When a network error occurs, we use a negative number so it does not
+ // clash with the HTTP status codes.
+ $result->code = -$errno;
+ $result->error = trim($errstr) ? trim($errstr) : t('Error opening socket @socket', array('@socket' => $socket));
+
+ // Mark that this request failed. This will trigger a check of the web
+ // server's ability to make outgoing HTTP requests the next time that
+ // requirements checking is performed.
+ // See system_requirements().
+ variable_set('drupal_http_request_fails', TRUE);
+
+ return $result;
+ }
+
+ // Construct the path to act on.
+ $path = isset($uri['path']) ? $uri['path'] : '/';
+ if (isset($uri['query'])) {
+ $path .= '?' . $uri['query'];
+ }
+
+ // Only add Content-Length if we actually have any content or if it is a POST
+ // or PUT request. Some non-standard servers get confused by Content-Length in
+ // at least HEAD/GET requests, and Squid always requires Content-Length in
+ // POST/PUT requests.
+ $content_length = strlen($options['data']);
+ if ($content_length > 0 || $options['method'] == 'POST' || $options['method'] == 'PUT') {
+ $options['headers']['Content-Length'] = $content_length;
+ }
+
+ // If the server URL has a user then attempt to use basic authentication.
+ if (isset($uri['user'])) {
+ $options['headers']['Authorization'] = 'Basic ' . base64_encode($uri['user'] . (isset($uri['pass']) ? ':' . $uri['pass'] : ':'));
+ }
+
+ // If the database prefix is being used by SimpleTest to run the tests in a copied
+ // database then set the user-agent header to the database prefix so that any
+ // calls to other Drupal pages will run the SimpleTest prefixed database. The
+ // user-agent is used to ensure that multiple testing sessions running at the
+ // same time won't interfere with each other as they would if the database
+ // prefix were stored statically in a file or database variable.
+ $test_info = &$GLOBALS['drupal_test_info'];
+ if (!empty($test_info['test_run_id'])) {
+ $options['headers']['User-Agent'] = drupal_generate_test_ua($test_info['test_run_id']);
+ }
+
+ $request = $options['method'] . ' ' . $path . " HTTP/1.0\r\n";
+ foreach ($options['headers'] as $name => $value) {
+ $request .= $name . ': ' . trim($value) . "\r\n";
+ }
+ $request .= "\r\n" . $options['data'];
+ $result->request = $request;
+ // Calculate how much time is left of the original timeout value.
+ $timeout = $options['timeout'] - timer_read(__FUNCTION__) / 1000;
+ if ($timeout > 0) {
+ stream_set_timeout($fp, floor($timeout), floor(1000000 * fmod($timeout, 1)));
+ fwrite($fp, $request);
+ }
+
+ // Fetch response. Due to PHP bugs like http://bugs.php.net/bug.php?id=43782
+ // and http://bugs.php.net/bug.php?id=46049 we can't rely on feof(), but
+ // instead must invoke stream_get_meta_data() each iteration.
+ $info = stream_get_meta_data($fp);
+ $alive = !$info['eof'] && !$info['timed_out'];
+ $response = '';
+
+ while ($alive) {
+ // Calculate how much time is left of the original timeout value.
+ $timeout = $options['timeout'] - timer_read(__FUNCTION__) / 1000;
+ if ($timeout <= 0) {
+ $info['timed_out'] = TRUE;
+ break;
+ }
+ stream_set_timeout($fp, floor($timeout), floor(1000000 * fmod($timeout, 1)));
+ $chunk = fread($fp, 1024);
+ $response .= $chunk;
+ $info = stream_get_meta_data($fp);
+ $alive = !$info['eof'] && !$info['timed_out'] && $chunk;
+ }
+ fclose($fp);
+
+ if ($info['timed_out']) {
+ $result->code = HTTP_REQUEST_TIMEOUT;
+ $result->error = 'request timed out';
+ return $result;
+ }
+ // Parse response headers from the response body.
+ // Be tolerant of malformed HTTP responses that separate header and body with
+ // \n\n or \r\r instead of \r\n\r\n.
+ list($response, $result->data) = preg_split("/\r\n\r\n|\n\n|\r\r/", $response, 2);
+ $response = preg_split("/\r\n|\n|\r/", $response);
+
+ // Parse the response status line.
+ list($protocol, $code, $status_message) = explode(' ', trim(array_shift($response)), 3);
+ $result->protocol = $protocol;
+ $result->status_message = $status_message;
+
+ $result->headers = array();
+
+ // Parse the response headers.
+ while ($line = trim(array_shift($response))) {
+ list($name, $value) = explode(':', $line, 2);
+ $name = strtolower($name);
+ if (isset($result->headers[$name]) && $name == 'set-cookie') {
+ // RFC 2109: the Set-Cookie response header comprises the token Set-
+ // Cookie:, followed by a comma-separated list of one or more cookies.
+ $result->headers[$name] .= ',' . trim($value);
+ }
+ else {
+ $result->headers[$name] = trim($value);
+ }
+ }
+
+ $responses = array(
+ 100 => 'Continue',
+ 101 => 'Switching Protocols',
+ 200 => 'OK',
+ 201 => 'Created',
+ 202 => 'Accepted',
+ 203 => 'Non-Authoritative Information',
+ 204 => 'No Content',
+ 205 => 'Reset Content',
+ 206 => 'Partial Content',
+ 300 => 'Multiple Choices',
+ 301 => 'Moved Permanently',
+ 302 => 'Found',
+ 303 => 'See Other',
+ 304 => 'Not Modified',
+ 305 => 'Use Proxy',
+ 307 => 'Temporary Redirect',
+ 400 => 'Bad Request',
+ 401 => 'Unauthorized',
+ 402 => 'Payment Required',
+ 403 => 'Forbidden',
+ 404 => 'Not Found',
+ 405 => 'Method Not Allowed',
+ 406 => 'Not Acceptable',
+ 407 => 'Proxy Authentication Required',
+ 408 => 'Request Time-out',
+ 409 => 'Conflict',
+ 410 => 'Gone',
+ 411 => 'Length Required',
+ 412 => 'Precondition Failed',
+ 413 => 'Request Entity Too Large',
+ 414 => 'Request-URI Too Large',
+ 415 => 'Unsupported Media Type',
+ 416 => 'Requested range not satisfiable',
+ 417 => 'Expectation Failed',
+ 500 => 'Internal Server Error',
+ 501 => 'Not Implemented',
+ 502 => 'Bad Gateway',
+ 503 => 'Service Unavailable',
+ 504 => 'Gateway Time-out',
+ 505 => 'HTTP Version not supported',
+ );
+ // RFC 2616 states that all unknown HTTP codes must be treated the same as the
+ // base code in their class.
+ if (!isset($responses[$code])) {
+ $code = floor($code / 100) * 100;
+ }
+ $result->code = $code;
+
+ switch ($code) {
+ case 200: // OK
+ case 304: // Not modified
+ break;
+ case 301: // Moved permanently
+ case 302: // Moved temporarily
+ case 307: // Moved temporarily
+ $location = $result->headers['location'];
+ $options['timeout'] -= timer_read(__FUNCTION__) / 1000;
+ if ($options['timeout'] <= 0) {
+ $result->code = HTTP_REQUEST_TIMEOUT;
+ $result->error = 'request timed out';
+ }
+ elseif ($options['max_redirects']) {
+ // Redirect to the new location.
+ $options['max_redirects']--;
+ $result = drupal_http_request($location, $options);
+ $result->redirect_code = $code;
+ }
+ if (!isset($result->redirect_url)) {
+ $result->redirect_url = $location;
+ }
+ break;
+ default:
+ $result->error = $status_message;
+ }
+
+ return $result;
+}
+
+/**
+ * Helper function for determining hosts excluded from needing a proxy.
+ *
+ * @return
+ * TRUE if a proxy should be used for this host.
+ */
+function _drupal_http_use_proxy($host) {
+ $proxy_exceptions = variable_get('proxy_exceptions', array('localhost', '127.0.0.1'));
+ return !in_array(strtolower($host), $proxy_exceptions, TRUE);
+}
+
+/**
+ * @} End of "HTTP handling".
+ */
+
+/**
+ * Strips slashes from a string or array of strings.
+ *
+ * Callback for array_walk() within fix_gpx_magic().
+ *
+ * @param $item
+ * An individual string or array of strings from superglobals.
+ */
+function _fix_gpc_magic(&$item) {
+ if (is_array($item)) {
+ array_walk($item, '_fix_gpc_magic');
+ }
+ else {
+ $item = stripslashes($item);
+ }
+}
+
+/**
+ * Strips slashes from $_FILES items.
+ *
+ * Callback for array_walk() within fix_gpc_magic().
+ *
+ * The tmp_name key is skipped keys since PHP generates single backslashes for
+ * file paths on Windows systems.
+ *
+ * @param $item
+ * An item from $_FILES.
+ * @param $key
+ * The key for the item within $_FILES.
+ *
+ * @see http://php.net/manual/features.file-upload.php#42280
+ */
+function _fix_gpc_magic_files(&$item, $key) {
+ if ($key != 'tmp_name') {
+ if (is_array($item)) {
+ array_walk($item, '_fix_gpc_magic_files');
+ }
+ else {
+ $item = stripslashes($item);
+ }
+ }
+}
+
+/**
+ * Fixes double-escaping caused by "magic quotes" in some PHP installations.
+ *
+ * @see _fix_gpc_magic()
+ * @see _fix_gpc_magic_files()
+ */
+function fix_gpc_magic() {
+ static $fixed = FALSE;
+ if (!$fixed && ini_get('magic_quotes_gpc')) {
+ array_walk($_GET, '_fix_gpc_magic');
+ array_walk($_POST, '_fix_gpc_magic');
+ array_walk($_COOKIE, '_fix_gpc_magic');
+ array_walk($_REQUEST, '_fix_gpc_magic');
+ array_walk($_FILES, '_fix_gpc_magic_files');
+ }
+ $fixed = TRUE;
+}
+
+/**
+ * @defgroup validation Input validation
+ * @{
+ * Functions to validate user input.
+ */
+
+/**
+ * Verifies the syntax of the given e-mail address.
+ *
+ * This uses the
+ * @link http://php.net/manual/filter.filters.validate.php PHP e-mail validation filter. @endlink
+ *
+ * @param $mail
+ * A string containing an e-mail address.
+ *
+ * @return
+ * TRUE if the address is in a valid format.
+ */
+function valid_email_address($mail) {
+ return (bool)filter_var($mail, FILTER_VALIDATE_EMAIL);
+}
+
+/**
+ * Verifies the syntax of the given URL.
+ *
+ * This function should only be used on actual URLs. It should not be used for
+ * Drupal menu paths, which can contain arbitrary characters.
+ * Valid values per RFC 3986.
+ * @param $url
+ * The URL to verify.
+ * @param $absolute
+ * Whether the URL is absolute (beginning with a scheme such as "http:").
+ *
+ * @return
+ * TRUE if the URL is in a valid format.
+ */
+function valid_url($url, $absolute = FALSE) {
+ if ($absolute) {
+ return (bool)preg_match("
+ /^ # Start at the beginning of the text
+ (?:ftp|https?|feed):\/\/ # Look for ftp, http, https or feed schemes
+ (?: # Userinfo (optional) which is typically
+ (?:(?:[\w\.\-\+!$&'\(\)*\+,;=]|%[0-9a-f]{2})+:)* # a username or a username and password
+ (?:[\w\.\-\+%!$&'\(\)*\+,;=]|%[0-9a-f]{2})+@ # combination
+ )?
+ (?:
+ (?:[a-z0-9\-\.]|%[0-9a-f]{2})+ # A domain name or a IPv4 address
+ |(?:\[(?:[0-9a-f]{0,4}:)*(?:[0-9a-f]{0,4})\]) # or a well formed IPv6 address
+ )
+ (?::[0-9]+)? # Server port number (optional)
+ (?:[\/|\?]
+ (?:[\w#!:\.\?\+=&@$'~*,;\/\(\)\[\]\-]|%[0-9a-f]{2}) # The path and query (optional)
+ *)?
+ $/xi", $url);
+ }
+ else {
+ return (bool)preg_match("/^(?:[\w#!:\.\?\+=&@$'~*,;\/\(\)\[\]\-]|%[0-9a-f]{2})+$/i", $url);
+ }
+}
+
+/**
+ * @} End of "defgroup validation".
+ */
+
+/**
+ * Registers an event for the current visitor to the flood control mechanism.
+ *
+ * @param $name
+ * The name of an event.
+ * @param $window
+ * Optional number of seconds before this event expires. Defaults to 3600 (1
+ * hour). Typically uses the same value as the flood_is_allowed() $window
+ * parameter. Expired events are purged on cron run to prevent the flood table
+ * from growing indefinitely.
+ * @param $identifier
+ * Optional identifier (defaults to the current user's IP address).
+ */
+function flood_register_event($name, $window = 3600, $identifier = NULL) {
+ if (!isset($identifier)) {
+ $identifier = ip_address();
+ }
+ db_insert('flood')
+ ->fields(array(
+ 'event' => $name,
+ 'identifier' => $identifier,
+ 'timestamp' => REQUEST_TIME,
+ 'expiration' => REQUEST_TIME + $window,
+ ))
+ ->execute();
+}
+
+/**
+ * Makes the flood control mechanism forget an event for the current visitor.
+ *
+ * @param $name
+ * The name of an event.
+ * @param $identifier
+ * Optional identifier (defaults to the current user's IP address).
+ */
+function flood_clear_event($name, $identifier = NULL) {
+ if (!isset($identifier)) {
+ $identifier = ip_address();
+ }
+ db_delete('flood')
+ ->condition('event', $name)
+ ->condition('identifier', $identifier)
+ ->execute();
+}
+
+/**
+ * Checks whether a user is allowed to proceed with the specified event.
+ *
+ * Events can have thresholds saying that each user can only do that event
+ * a certain number of times in a time window. This function verifies that the
+ * current user has not exceeded this threshold.
+ *
+ * @param $name
+ * The unique name of the event.
+ * @param $threshold
+ * The maximum number of times each user can do this event per time window.
+ * @param $window
+ * Number of seconds in the time window for this event (default is 3600
+ * seconds, or 1 hour).
+ * @param $identifier
+ * Unique identifier of the current user. Defaults to their IP address.
+ *
+ * @return
+ * TRUE if the user is allowed to proceed. FALSE if they have exceeded the
+ * threshold and should not be allowed to proceed.
+ */
+function flood_is_allowed($name, $threshold, $window = 3600, $identifier = NULL) {
+ if (!isset($identifier)) {
+ $identifier = ip_address();
+ }
+ $number = db_query("SELECT COUNT(*) FROM {flood} WHERE event = :event AND identifier = :identifier AND timestamp > :timestamp", array(
+ ':event' => $name,
+ ':identifier' => $identifier,
+ ':timestamp' => REQUEST_TIME - $window))
+ ->fetchField();
+ return ($number < $threshold);
+}
+
+/**
+ * @defgroup sanitization Sanitization functions
+ * @{
+ * Functions to sanitize values.
+ *
+ * See http://drupal.org/writing-secure-code for information
+ * on writing secure code.
+ */
+
+/**
+ * Strips dangerous protocols (e.g. 'javascript:') from a URI.
+ *
+ * This function must be called for all URIs within user-entered input prior
+ * to being output to an HTML attribute value. It is often called as part of
+ * check_url() or filter_xss(), but those functions return an HTML-encoded
+ * string, so this function can be called independently when the output needs to
+ * be a plain-text string for passing to t(), l(), drupal_attributes(), or
+ * another function that will call check_plain() separately.
+ *
+ * @param $uri
+ * A plain-text URI that might contain dangerous protocols.
+ *
+ * @return
+ * A plain-text URI stripped of dangerous protocols. As with all plain-text
+ * strings, this return value must not be output to an HTML page without
+ * check_plain() being called on it. However, it can be passed to functions
+ * expecting plain-text strings.
+ *
+ * @see check_url()
+ */
+function drupal_strip_dangerous_protocols($uri) {
+ static $allowed_protocols;
+
+ if (!isset($allowed_protocols)) {
+ $allowed_protocols = array_flip(variable_get('filter_allowed_protocols', array('ftp', 'http', 'https', 'irc', 'mailto', 'news', 'nntp', 'rtsp', 'sftp', 'ssh', 'tel', 'telnet', 'webcal')));
+ }
+
+ // Iteratively remove any invalid protocol found.
+ do {
+ $before = $uri;
+ $colonpos = strpos($uri, ':');
+ if ($colonpos > 0) {
+ // We found a colon, possibly a protocol. Verify.
+ $protocol = substr($uri, 0, $colonpos);
+ // If a colon is preceded by a slash, question mark or hash, it cannot
+ // possibly be part of the URL scheme. This must be a relative URL, which
+ // inherits the (safe) protocol of the base document.
+ if (preg_match('![/?#]!', $protocol)) {
+ break;
+ }
+ // Check if this is a disallowed protocol. Per RFC2616, section 3.2.3
+ // (URI Comparison) scheme comparison must be case-insensitive.
+ if (!isset($allowed_protocols[strtolower($protocol)])) {
+ $uri = substr($uri, $colonpos + 1);
+ }
+ }
+ } while ($before != $uri);
+
+ return $uri;
+}
+
+/**
+ * Strips dangerous protocols from a URI and encodes it for output to HTML.
+ *
+ * @param $uri
+ * A plain-text URI that might contain dangerous protocols.
+ *
+ * @return
+ * A URI stripped of dangerous protocols and encoded for output to an HTML
+ * attribute value. Because it is already encoded, it should not be set as a
+ * value within a $attributes array passed to drupal_attributes(), because
+ * drupal_attributes() expects those values to be plain-text strings. To pass
+ * a filtered URI to drupal_attributes(), call
+ * drupal_strip_dangerous_protocols() instead.
+ *
+ * @see drupal_strip_dangerous_protocols()
+ */
+function check_url($uri) {
+ return check_plain(drupal_strip_dangerous_protocols($uri));
+}
+
+/**
+ * Applies a very permissive XSS/HTML filter for admin-only use.
+ *
+ * Use only for fields where it is impractical to use the
+ * whole filter system, but where some (mainly inline) mark-up
+ * is desired (so check_plain() is not acceptable).
+ *
+ * Allows all tags that can be used inside an HTML body, save
+ * for scripts and styles.
+ */
+function filter_xss_admin($string) {
+ return filter_xss($string, array('a', 'abbr', 'acronym', 'address', 'article', 'aside', 'b', 'bdi', 'bdo', 'big', 'blockquote', 'br', 'caption', 'cite', 'code', 'col', 'colgroup', 'command', 'dd', 'del', 'details', 'dfn', 'div', 'dl', 'dt', 'em', 'figcaption', 'figure', 'footer', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'header', 'hgroup', 'hr', 'i', 'img', 'ins', 'kbd', 'li', 'mark', 'menu', 'meter', 'nav', 'ol', 'output', 'p', 'pre', 'progress', 'q', 'rp', 'rt', 'ruby', 's', 'samp', 'section', 'small', 'span', 'strong', 'sub', 'summary', 'sup', 'table', 'tbody', 'td', 'tfoot', 'th', 'thead', 'time', 'tr', 'tt', 'u', 'ul', 'var', 'wbr'));
+}
+
+/**
+ * Filters HTML to prevent cross-site-scripting (XSS) vulnerabilities.
+ *
+ * Based on kses by Ulf Harnhammar, see http://sourceforge.net/projects/kses.
+ * For examples of various XSS attacks, see: http://ha.ckers.org/xss.html.
+ *
+ * This code does four things:
+ * - Removes characters and constructs that can trick browsers.
+ * - Makes sure all HTML entities are well-formed.
+ * - Makes sure all HTML tags and attributes are well-formed.
+ * - Makes sure no HTML tags contain URLs with a disallowed protocol (e.g.
+ * javascript:).
+ *
+ * @param $string
+ * The string with raw HTML in it. It will be stripped of everything that can
+ * cause an XSS attack.
+ * @param $allowed_tags
+ * An array of allowed tags.
+ *
+ * @return
+ * An XSS safe version of $string, or an empty string if $string is not
+ * valid UTF-8.
+ *
+ * @see drupal_validate_utf8()
+ * @ingroup sanitization
+ */
+function filter_xss($string, $allowed_tags = array('a', 'em', 'strong', 'cite', 'blockquote', 'code', 'ul', 'ol', 'li', 'dl', 'dt', 'dd')) {
+ // Only operate on valid UTF-8 strings. This is necessary to prevent cross
+ // site scripting issues on Internet Explorer 6.
+ if (!drupal_validate_utf8($string)) {
+ return '';
+ }
+ // Store the text format.
+ _filter_xss_split($allowed_tags, TRUE);
+ // Remove NULL characters (ignored by some browsers).
+ $string = str_replace(chr(0), '', $string);
+ // Remove Netscape 4 JS entities.
+ $string = preg_replace('%&\s*\{[^}]*(\}\s*;?|$)%', '', $string);
+
+ // Defuse all HTML entities.
+ $string = str_replace('&', '&amp;', $string);
+ // Change back only well-formed entities in our whitelist:
+ // Decimal numeric entities.
+ $string = preg_replace('/&amp;#([0-9]+;)/', '&#\1', $string);
+ // Hexadecimal numeric entities.
+ $string = preg_replace('/&amp;#[Xx]0*((?:[0-9A-Fa-f]{2})+;)/', '&#x\1', $string);
+ // Named entities.
+ $string = preg_replace('/&amp;([A-Za-z][A-Za-z0-9]*;)/', '&\1', $string);
+
+ return preg_replace_callback('%
+ (
+ <(?=[^a-zA-Z!/]) # a lone <
+ | # or
+ <!--.*?--> # a comment
+ | # or
+ <[^>]*(>|$) # a string that starts with a <, up until the > or the end of the string
+ | # or
+ > # just a >
+ )%x', '_filter_xss_split', $string);
+}
+
+/**
+ * Processes an HTML tag.
+ *
+ * @param $m
+ * An array with various meaning depending on the value of $store.
+ * If $store is TRUE then the array contains the allowed tags.
+ * If $store is FALSE then the array has one element, the HTML tag to process.
+ * @param $store
+ * Whether to store $m.
+ *
+ * @return
+ * If the element isn't allowed, an empty string. Otherwise, the cleaned up
+ * version of the HTML element.
+ */
+function _filter_xss_split($m, $store = FALSE) {
+ static $allowed_html;
+
+ if ($store) {
+ $allowed_html = array_flip($m);
+ return;
+ }
+
+ $string = $m[1];
+
+ if (substr($string, 0, 1) != '<') {
+ // We matched a lone ">" character.
+ return '&gt;';
+ }
+ elseif (strlen($string) == 1) {
+ // We matched a lone "<" character.
+ return '&lt;';
+ }
+
+ if (!preg_match('%^<\s*(/\s*)?([a-zA-Z0-9]+)([^>]*)>?|(<!--.*?-->)$%', $string, $matches)) {
+ // Seriously malformed.
+ return '';
+ }
+
+ $slash = trim($matches[1]);
+ $elem = &$matches[2];
+ $attrlist = &$matches[3];
+ $comment = &$matches[4];
+
+ if ($comment) {
+ $elem = '!--';
+ }
+
+ if (!isset($allowed_html[strtolower($elem)])) {
+ // Disallowed HTML element.
+ return '';
+ }
+
+ if ($comment) {
+ return $comment;
+ }
+
+ if ($slash != '') {
+ return "</$elem>";
+ }
+
+ // Is there a closing XHTML slash at the end of the attributes?
+ $attrlist = preg_replace('%(\s?)/\s*$%', '\1', $attrlist, -1, $count);
+ $xhtml_slash = $count ? ' /' : '';
+
+ // Clean up attributes.
+ $attr2 = implode(' ', _filter_xss_attributes($attrlist));
+ $attr2 = preg_replace('/[<>]/', '', $attr2);
+ $attr2 = strlen($attr2) ? ' ' . $attr2 : '';
+
+ return "<$elem$attr2$xhtml_slash>";
+}
+
+/**
+ * Processes a string of HTML attributes.
+ *
+ * @return
+ * Cleaned up version of the HTML attributes.
+ */
+function _filter_xss_attributes($attr) {
+ $attrarr = array();
+ $mode = 0;
+ $attrname = '';
+
+ while (strlen($attr) != 0) {
+ // Was the last operation successful?
+ $working = 0;
+
+ switch ($mode) {
+ case 0:
+ // Attribute name, href for instance.
+ if (preg_match('/^([-a-zA-Z]+)/', $attr, $match)) {
+ $attrname = strtolower($match[1]);
+ $skip = ($attrname == 'style' || substr($attrname, 0, 2) == 'on');
+ $working = $mode = 1;
+ $attr = preg_replace('/^[-a-zA-Z]+/', '', $attr);
+ }
+ break;
+
+ case 1:
+ // Equals sign or valueless ("selected").
+ if (preg_match('/^\s*=\s*/', $attr)) {
+ $working = 1; $mode = 2;
+ $attr = preg_replace('/^\s*=\s*/', '', $attr);
+ break;
+ }
+
+ if (preg_match('/^\s+/', $attr)) {
+ $working = 1; $mode = 0;
+ if (!$skip) {
+ $attrarr[] = $attrname;
+ }
+ $attr = preg_replace('/^\s+/', '', $attr);
+ }
+ break;
+
+ case 2:
+ // Attribute value, a URL after href= for instance.
+ if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match)) {
+ $thisval = filter_xss_bad_protocol($match[1]);
+
+ if (!$skip) {
+ $attrarr[] = "$attrname=\"$thisval\"";
+ }
+ $working = 1;
+ $mode = 0;
+ $attr = preg_replace('/^"[^"]*"(\s+|$)/', '', $attr);
+ break;
+ }
+
+ if (preg_match("/^'([^']*)'(\s+|$)/", $attr, $match)) {
+ $thisval = filter_xss_bad_protocol($match[1]);
+
+ if (!$skip) {
+ $attrarr[] = "$attrname='$thisval'";
+ }
+ $working = 1; $mode = 0;
+ $attr = preg_replace("/^'[^']*'(\s+|$)/", '', $attr);
+ break;
+ }
+
+ if (preg_match("%^([^\s\"']+)(\s+|$)%", $attr, $match)) {
+ $thisval = filter_xss_bad_protocol($match[1]);
+
+ if (!$skip) {
+ $attrarr[] = "$attrname=\"$thisval\"";
+ }
+ $working = 1; $mode = 0;
+ $attr = preg_replace("%^[^\s\"']+(\s+|$)%", '', $attr);
+ }
+ break;
+ }
+
+ if ($working == 0) {
+ // Not well formed; remove and try again.
+ $attr = preg_replace('/
+ ^
+ (
+ "[^"]*("|$) # - a string that starts with a double quote, up until the next double quote or the end of the string
+ | # or
+ \'[^\']*(\'|$)| # - a string that starts with a quote, up until the next quote or the end of the string
+ | # or
+ \S # - a non-whitespace character
+ )* # any number of the above three
+ \s* # any number of whitespaces
+ /x', '', $attr);
+ $mode = 0;
+ }
+ }
+
+ // The attribute list ends with a valueless attribute like "selected".
+ if ($mode == 1 && !$skip) {
+ $attrarr[] = $attrname;
+ }
+ return $attrarr;
+}
+
+/**
+ * Processes an HTML attribute value and strips dangerous protocols from URLs.
+ *
+ * @param $string
+ * The string with the attribute value.
+ * @param $decode
+ * (deprecated) Whether to decode entities in the $string. Set to FALSE if the
+ * $string is in plain text, TRUE otherwise. Defaults to TRUE. This parameter
+ * is deprecated and will be removed in Drupal 8. To process a plain-text URI,
+ * call drupal_strip_dangerous_protocols() or check_url() instead.
+ *
+ * @return
+ * Cleaned up and HTML-escaped version of $string.
+ */
+function filter_xss_bad_protocol($string, $decode = TRUE) {
+ // Get the plain text representation of the attribute value (i.e. its meaning).
+ // @todo Remove the $decode parameter in Drupal 8, and always assume an HTML
+ // string that needs decoding.
+ if ($decode) {
+ if (!function_exists('decode_entities')) {
+ require_once DRUPAL_ROOT . '/includes/unicode.inc';
+ }
+
+ $string = decode_entities($string);
+ }
+ return check_plain(drupal_strip_dangerous_protocols($string));
+}
+
+/**
+ * @} End of "defgroup sanitization".
+ */
+
+/**
+ * @defgroup format Formatting
+ * @{
+ * Functions to format numbers, strings, dates, etc.
+ */
+
+/**
+ * Formats an RSS channel.
+ *
+ * Arbitrary elements may be added using the $args associative array.
+ */
+function format_rss_channel($title, $link, $description, $items, $langcode = NULL, $args = array()) {
+ global $language_content;
+ $langcode = $langcode ? $langcode : $language_content->language;
+
+ $output = "<channel>\n";
+ $output .= ' <title>' . check_plain($title) . "</title>\n";
+ $output .= ' <link>' . check_url($link) . "</link>\n";
+
+ // The RSS 2.0 "spec" doesn't indicate HTML can be used in the description.
+ // We strip all HTML tags, but need to prevent double encoding from properly
+ // escaped source data (such as &amp becoming &amp;amp;).
+ $output .= ' <description>' . check_plain(decode_entities(strip_tags($description))) . "</description>\n";
+ $output .= ' <language>' . check_plain($langcode) . "</language>\n";
+ $output .= format_xml_elements($args);
+ $output .= $items;
+ $output .= "</channel>\n";
+
+ return $output;
+}
+
+/**
+ * Formats a single RSS item.
+ *
+ * Arbitrary elements may be added using the $args associative array.
+ */
+function format_rss_item($title, $link, $description, $args = array()) {
+ $output = "<item>\n";
+ $output .= ' <title>' . check_plain($title) . "</title>\n";
+ $output .= ' <link>' . check_url($link) . "</link>\n";
+ $output .= ' <description>' . check_plain($description) . "</description>\n";
+ $output .= format_xml_elements($args);
+ $output .= "</item>\n";
+
+ return $output;
+}
+
+/**
+ * Formats XML elements.
+ *
+ * @param $array
+ * An array where each item represents an element and is either a:
+ * - (key => value) pair (<key>value</key>)
+ * - Associative array with fields:
+ * - 'key': element name
+ * - 'value': element contents
+ * - 'attributes': associative array of element attributes
+ *
+ * In both cases, 'value' can be a simple string, or it can be another array
+ * with the same format as $array itself for nesting.
+ */
+function format_xml_elements($array) {
+ $output = '';
+ foreach ($array as $key => $value) {
+ if (is_numeric($key)) {
+ if ($value['key']) {
+ $output .= ' <' . $value['key'];
+ if (isset($value['attributes']) && is_array($value['attributes'])) {
+ $output .= drupal_attributes($value['attributes']);
+ }
+
+ if (isset($value['value']) && $value['value'] != '') {
+ $output .= '>' . (is_array($value['value']) ? format_xml_elements($value['value']) : check_plain($value['value'])) . '</' . $value['key'] . ">\n";
+ }
+ else {
+ $output .= " />\n";
+ }
+ }
+ }
+ else {
+ $output .= ' <' . $key . '>' . (is_array($value) ? format_xml_elements($value) : check_plain($value)) . "</$key>\n";
+ }
+ }
+ return $output;
+}
+
+/**
+ * Formats a string containing a count of items.
+ *
+ * This function ensures that the string is pluralized correctly. Since t() is
+ * called by this function, make sure not to pass already-localized strings to
+ * it.
+ *
+ * For example:
+ * @code
+ * $output = format_plural($node->comment_count, '1 comment', '@count comments');
+ * @endcode
+ *
+ * Example with additional replacements:
+ * @code
+ * $output = format_plural($update_count,
+ * 'Changed the content type of 1 post from %old-type to %new-type.',
+ * 'Changed the content type of @count posts from %old-type to %new-type.',
+ * array('%old-type' => $info->old_type, '%new-type' => $info->new_type));
+ * @endcode
+ *
+ * @param $count
+ * The item count to display.
+ * @param $singular
+ * The string for the singular case. Make sure it is clear this is singular,
+ * to ease translation (e.g. use "1 new comment" instead of "1 new"). Do not
+ * use @count in the singular string.
+ * @param $plural
+ * The string for the plural case. Make sure it is clear this is plural, to
+ * ease translation. Use @count in place of the item count, as in
+ * "@count new comments".
+ * @param $args
+ * An associative array of replacements to make after translation. Instances
+ * of any key in this array are replaced with the corresponding value.
+ * Based on the first character of the key, the value is escaped and/or
+ * themed. See format_string(). Note that you do not need to include @count
+ * in this array; this replacement is done automatically for the plural case.
+ * @param $options
+ * An associative array of additional options. See t() for allowed keys.
+ *
+ * @return
+ * A translated string.
+ *
+ * @see t()
+ * @see format_string()
+ */
+function format_plural($count, $singular, $plural, array $args = array(), array $options = array()) {
+ $args['@count'] = $count;
+ if ($count == 1) {
+ return t($singular, $args, $options);
+ }
+
+ // Get the plural index through the gettext formula.
+ $index = (function_exists('locale_get_plural')) ? locale_get_plural($count, isset($options['langcode']) ? $options['langcode'] : NULL) : -1;
+ // If the index cannot be computed, use the plural as a fallback (which
+ // allows for most flexiblity with the replaceable @count value).
+ if ($index < 0) {
+ return t($plural, $args, $options);
+ }
+ else {
+ switch ($index) {
+ case "0":
+ return t($singular, $args, $options);
+ case "1":
+ return t($plural, $args, $options);
+ default:
+ unset($args['@count']);
+ $args['@count[' . $index . ']'] = $count;
+ return t(strtr($plural, array('@count' => '@count[' . $index . ']')), $args, $options);
+ }
+ }
+}
+
+/**
+ * Parses a given byte count.
+ *
+ * @param $size
+ * A size expressed as a number of bytes with optional SI or IEC binary unit
+ * prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8 bytes, 9mbytes).
+ *
+ * @return
+ * An integer representation of the size in bytes.
+ */
+function parse_size($size) {
+ $unit = preg_replace('/[^bkmgtpezy]/i', '', $size); // Remove the non-unit characters from the size.
+ $size = preg_replace('/[^0-9\.]/', '', $size); // Remove the non-numeric characters from the size.
+ if ($unit) {
+ // Find the position of the unit in the ordered string which is the power of magnitude to multiply a kilobyte by.
+ return round($size * pow(DRUPAL_KILOBYTE, stripos('bkmgtpezy', $unit[0])));
+ }
+ else {
+ return round($size);
+ }
+}
+
+/**
+ * Generates a string representation for the given byte count.
+ *
+ * @param $size
+ * A size in bytes.
+ * @param $langcode
+ * Optional language code to translate to a language other than what is used
+ * to display the page.
+ *
+ * @return
+ * A translated string representation of the size.
+ */
+function format_size($size, $langcode = NULL) {
+ if ($size < DRUPAL_KILOBYTE) {
+ return format_plural($size, '1 byte', '@count bytes', array(), array('langcode' => $langcode));
+ }
+ else {
+ $size = $size / DRUPAL_KILOBYTE; // Convert bytes to kilobytes.
+ $units = array(
+ t('@size KB', array(), array('langcode' => $langcode)),
+ t('@size MB', array(), array('langcode' => $langcode)),
+ t('@size GB', array(), array('langcode' => $langcode)),
+ t('@size TB', array(), array('langcode' => $langcode)),
+ t('@size PB', array(), array('langcode' => $langcode)),
+ t('@size EB', array(), array('langcode' => $langcode)),
+ t('@size ZB', array(), array('langcode' => $langcode)),
+ t('@size YB', array(), array('langcode' => $langcode)),
+ );
+ foreach ($units as $unit) {
+ if (round($size, 2) >= DRUPAL_KILOBYTE) {
+ $size = $size / DRUPAL_KILOBYTE;
+ }
+ else {
+ break;
+ }
+ }
+ return str_replace('@size', round($size, 2), $unit);
+ }
+}
+
+/**
+ * Formats a time interval with the requested granularity.
+ *
+ * @param $interval
+ * The length of the interval in seconds.
+ * @param $granularity
+ * How many different units to display in the string.
+ * @param $langcode
+ * Optional language code to translate to a language other than
+ * what is used to display the page.
+ *
+ * @return
+ * A translated string representation of the interval.
+ */
+function format_interval($interval, $granularity = 2, $langcode = NULL) {
+ $units = array(
+ '1 year|@count years' => 31536000,
+ '1 month|@count months' => 2592000,
+ '1 week|@count weeks' => 604800,
+ '1 day|@count days' => 86400,
+ '1 hour|@count hours' => 3600,
+ '1 min|@count min' => 60,
+ '1 sec|@count sec' => 1
+ );
+ $output = '';
+ foreach ($units as $key => $value) {
+ $key = explode('|', $key);
+ if ($interval >= $value) {
+ $output .= ($output ? ' ' : '') . format_plural(floor($interval / $value), $key[0], $key[1], array(), array('langcode' => $langcode));
+ $interval %= $value;
+ $granularity--;
+ }
+
+ if ($granularity == 0) {
+ break;
+ }
+ }
+ return $output ? $output : t('0 sec', array(), array('langcode' => $langcode));
+}
+
+/**
+ * Formats a date, using a date type or a custom date format string.
+ *
+ * @param $timestamp
+ * A UNIX timestamp to format.
+ * @param $type
+ * (optional) The format to use, one of:
+ * - 'short', 'medium', or 'long' (the corresponding built-in date formats).
+ * - The name of a date type defined by a module in hook_date_format_types(),
+ * if it's been assigned a format.
+ * - The machine name of an administrator-defined date format.
+ * - 'custom', to use $format.
+ * Defaults to 'medium'.
+ * @param $format
+ * (optional) If $type is 'custom', a PHP date format string suitable for
+ * input to date(). Use a backslash to escape ordinary text, so it does not
+ * get interpreted as date format characters.
+ * @param $timezone
+ * (optional) Time zone identifier, as described at
+ * http://php.net/manual/timezones.php Defaults to the time zone used to
+ * display the page.
+ * @param $langcode
+ * (optional) Language code to translate to. Defaults to the language used to
+ * display the page.
+ *
+ * @return
+ * A translated date string in the requested format.
+ */
+function format_date($timestamp, $type = 'medium', $format = '', $timezone = NULL, $langcode = NULL) {
+ // Use the advanced drupal_static() pattern, since this is called very often.
+ static $drupal_static_fast;
+ if (!isset($drupal_static_fast)) {
+ $drupal_static_fast['timezones'] = &drupal_static(__FUNCTION__);
+ }
+ $timezones = &$drupal_static_fast['timezones'];
+
+ if (!isset($timezone)) {
+ $timezone = date_default_timezone_get();
+ }
+ // Store DateTimeZone objects in an array rather than repeatedly
+ // constructing identical objects over the life of a request.
+ if (!isset($timezones[$timezone])) {
+ $timezones[$timezone] = timezone_open($timezone);
+ }
+
+ // Use the default langcode if none is set.
+ global $language;
+ if (empty($langcode)) {
+ $langcode = isset($language->language) ? $language->language : 'en';
+ }
+
+ switch ($type) {
+ case 'short':
+ $format = variable_get('date_format_short', 'm/d/Y - H:i');
+ break;
+
+ case 'long':
+ $format = variable_get('date_format_long', 'l, F j, Y - H:i');
+ break;
+
+ case 'custom':
+ // No change to format.
+ break;
+
+ case 'medium':
+ default:
+ // Retrieve the format of the custom $type passed.
+ if ($type != 'medium') {
+ $format = variable_get('date_format_' . $type, '');
+ }
+ // Fall back to 'medium'.
+ if ($format === '') {
+ $format = variable_get('date_format_medium', 'D, m/d/Y - H:i');
+ }
+ break;
+ }
+
+ // Create a DateTime object from the timestamp.
+ $date_time = date_create('@' . $timestamp);
+ // Set the time zone for the DateTime object.
+ date_timezone_set($date_time, $timezones[$timezone]);
+
+ // Encode markers that should be translated. 'A' becomes '\xEF\AA\xFF'.
+ // xEF and xFF are invalid UTF-8 sequences, and we assume they are not in the
+ // input string.
+ // Paired backslashes are isolated to prevent errors in read-ahead evaluation.
+ // The read-ahead expression ensures that A matches, but not \A.
+ $format = preg_replace(array('/\\\\\\\\/', '/(?<!\\\\)([AaeDlMTF])/'), array("\xEF\\\\\\\\\xFF", "\xEF\\\\\$1\$1\xFF"), $format);
+
+ // Call date_format().
+ $format = date_format($date_time, $format);
+
+ // Pass the langcode to _format_date_callback().
+ _format_date_callback(NULL, $langcode);
+
+ // Translate the marked sequences.
+ return preg_replace_callback('/\xEF([AaeDlMTF]?)(.*?)\xFF/', '_format_date_callback', $format);
+}
+
+/**
+ * Returns an ISO8601 formatted date based on the given date.
+ *
+ * Callback for use within hook_rdf_mapping() implementations.
+ *
+ * @param $date
+ * A UNIX timestamp.
+ *
+ * @return string
+ * An ISO8601 formatted date.
+ */
+function date_iso8601($date) {
+ // The DATE_ISO8601 constant cannot be used here because it does not match
+ // date('c') and produces invalid RDF markup.
+ return date('c', $date);
+}
+
+/**
+ * Translates a formatted date string.
+ *
+ * Callback for preg_replace_callback() within format_date().
+ */
+function _format_date_callback(array $matches = NULL, $new_langcode = NULL) {
+ // We cache translations to avoid redundant and rather costly calls to t().
+ static $cache, $langcode;
+
+ if (!isset($matches)) {
+ $langcode = $new_langcode;
+ return;
+ }
+
+ $code = $matches[1];
+ $string = $matches[2];
+
+ if (!isset($cache[$langcode][$code][$string])) {
+ $options = array(
+ 'langcode' => $langcode,
+ );
+
+ if ($code == 'F') {
+ $options['context'] = 'Long month name';
+ }
+
+ if ($code == '') {
+ $cache[$langcode][$code][$string] = $string;
+ }
+ else {
+ $cache[$langcode][$code][$string] = t($string, array(), $options);
+ }
+ }
+ return $cache[$langcode][$code][$string];
+}
+
+/**
+ * Format a username.
+ *
+ * This is also the label callback implementation of
+ * callback_entity_info_label() for user_entity_info().
+ *
+ * By default, the passed-in object's 'name' property is used if it exists, or
+ * else, the site-defined value for the 'anonymous' variable. However, a module
+ * may override this by implementing hook_username_alter(&$name, $account).
+ *
+ * @see hook_username_alter()
+ *
+ * @param $account
+ * The account object for the user whose name is to be formatted.
+ *
+ * @return
+ * An unsanitized string with the username to display. The code receiving
+ * this result must ensure that check_plain() is called on it before it is
+ * printed to the page.
+ */
+function format_username($account) {
+ $name = !empty($account->name) ? $account->name : variable_get('anonymous', t('Anonymous'));
+ drupal_alter('username', $name, $account);
+ return $name;
+}
+
+/**
+ * @} End of "defgroup format".
+ */
+
+/**
+ * Generates an internal or external URL.
+ *
+ * When creating links in modules, consider whether l() could be a better
+ * alternative than url().
+ *
+ * @param $path
+ * (optional) The internal path or external URL being linked to, such as
+ * "node/34" or "http://example.com/foo". The default value is equivalent to
+ * passing in '<front>'. A few notes:
+ * - If you provide a full URL, it will be considered an external URL.
+ * - If you provide only the path (e.g. "node/34"), it will be
+ * considered an internal link. In this case, it should be a system URL,
+ * and it will be replaced with the alias, if one exists. Additional query
+ * arguments for internal paths must be supplied in $options['query'], not
+ * included in $path.
+ * - If you provide an internal path and $options['alias'] is set to TRUE, the
+ * path is assumed already to be the correct path alias, and the alias is
+ * not looked up.
+ * - The special string '<front>' generates a link to the site's base URL.
+ * - If your external URL contains a query (e.g. http://example.com/foo?a=b),
+ * then you can either URL encode the query keys and values yourself and
+ * include them in $path, or use $options['query'] to let this function
+ * URL encode them.
+ * @param $options
+ * (optional) An associative array of additional options, with the following
+ * elements:
+ * - 'query': An array of query key/value-pairs (without any URL-encoding) to
+ * append to the URL.
+ * - 'fragment': A fragment identifier (named anchor) to append to the URL.
+ * Do not include the leading '#' character.
+ * - 'absolute': Defaults to FALSE. Whether to force the output to be an
+ * absolute link (beginning with http:). Useful for links that will be
+ * displayed outside the site, such as in an RSS feed.
+ * - 'alias': Defaults to FALSE. Whether the given path is a URL alias
+ * already.
+ * - 'external': Whether the given path is an external URL.
+ * - 'language': An optional language object. If the path being linked to is
+ * internal to the site, $options['language'] is used to look up the alias
+ * for the URL. If $options['language'] is omitted, the global $language_url
+ * will be used.
+ * - 'https': Whether this URL should point to a secure location. If not
+ * defined, the current scheme is used, so the user stays on HTTP or HTTPS
+ * respectively. TRUE enforces HTTPS and FALSE enforces HTTP, but HTTPS can
+ * only be enforced when the variable 'https' is set to TRUE.
+ * - 'base_url': Only used internally, to modify the base URL when a language
+ * dependent URL requires so.
+ * - 'prefix': Only used internally, to modify the path when a language
+ * dependent URL requires so.
+ * - 'script': The script filename in Drupal's root directory to use when
+ * clean URLs are disabled, such as 'index.php'. Defaults to an empty
+ * string, as most modern web servers automatically find 'index.php'. If
+ * clean URLs are disabled, the value of $path is appended as query
+ * parameter 'q' to $options['script'] in the returned URL. When deploying
+ * Drupal on a web server that cannot be configured to automatically find
+ * index.php, then hook_url_outbound_alter() can be implemented to force
+ * this value to 'index.php'.
+ * - 'entity_type': The entity type of the object that called url(). Only
+ * set if url() is invoked by entity_uri().
+ * - 'entity': The entity object (such as a node) for which the URL is being
+ * generated. Only set if url() is invoked by entity_uri().
+ *
+ * @return
+ * A string containing a URL to the given path.
+ */
+function url($path = NULL, array $options = array()) {
+ // Merge in defaults.
+ $options += array(
+ 'fragment' => '',
+ 'query' => array(),
+ 'absolute' => FALSE,
+ 'alias' => FALSE,
+ 'prefix' => ''
+ );
+
+ if (!isset($options['external'])) {
+ // Return an external link if $path contains an allowed absolute URL. Only
+ // call the slow drupal_strip_dangerous_protocols() if $path contains a ':'
+ // before any / ? or #. Note: we could use url_is_external($path) here, but
+ // that would require another function call, and performance inside url() is
+ // critical.
+ $colonpos = strpos($path, ':');
+ $options['external'] = ($colonpos !== FALSE && !preg_match('![/?#]!', substr($path, 0, $colonpos)) && drupal_strip_dangerous_protocols($path) == $path);
+ }
+
+ // Preserve the original path before altering or aliasing.
+ $original_path = $path;
+
+ // Allow other modules to alter the outbound URL and options.
+ drupal_alter('url_outbound', $path, $options, $original_path);
+
+ if (isset($options['fragment']) && $options['fragment'] !== '') {
+ $options['fragment'] = '#' . $options['fragment'];
+ }
+
+ if ($options['external']) {
+ // Split off the fragment.
+ if (strpos($path, '#') !== FALSE) {
+ list($path, $old_fragment) = explode('#', $path, 2);
+ // If $options contains no fragment, take it over from the path.
+ if (isset($old_fragment) && !$options['fragment']) {
+ $options['fragment'] = '#' . $old_fragment;
+ }
+ }
+ // Append the query.
+ if ($options['query']) {
+ $path .= (strpos($path, '?') !== FALSE ? '&' : '?') . drupal_http_build_query($options['query']);
+ }
+ if (isset($options['https']) && variable_get('https', FALSE)) {
+ if ($options['https'] === TRUE) {
+ $path = str_replace('http://', 'https://', $path);
+ }
+ elseif ($options['https'] === FALSE) {
+ $path = str_replace('https://', 'http://', $path);
+ }
+ }
+ // Reassemble.
+ return $path . $options['fragment'];
+ }
+
+ global $base_url, $base_secure_url, $base_insecure_url;
+
+ // The base_url might be rewritten from the language rewrite in domain mode.
+ if (!isset($options['base_url'])) {
+ if (isset($options['https']) && variable_get('https', FALSE)) {
+ if ($options['https'] === TRUE) {
+ $options['base_url'] = $base_secure_url;
+ $options['absolute'] = TRUE;
+ }
+ elseif ($options['https'] === FALSE) {
+ $options['base_url'] = $base_insecure_url;
+ $options['absolute'] = TRUE;
+ }
+ }
+ else {
+ $options['base_url'] = $base_url;
+ }
+ }
+
+ // The special path '<front>' links to the default front page.
+ if ($path == '<front>') {
+ $path = '';
+ }
+ elseif (!empty($path) && !$options['alias']) {
+ $language = isset($options['language']) && isset($options['language']->language) ? $options['language']->language : '';
+ $alias = drupal_get_path_alias($original_path, $language);
+ if ($alias != $original_path) {
+ $path = $alias;
+ }
+ }
+
+ $base = $options['absolute'] ? $options['base_url'] . '/' : base_path();
+ $prefix = empty($path) ? rtrim($options['prefix'], '/') : $options['prefix'];
+
+ // With Clean URLs.
+ if (!empty($GLOBALS['conf']['clean_url'])) {
+ $path = drupal_encode_path($prefix . $path);
+ if ($options['query']) {
+ return $base . $path . '?' . drupal_http_build_query($options['query']) . $options['fragment'];
+ }
+ else {
+ return $base . $path . $options['fragment'];
+ }
+ }
+ // Without Clean URLs.
+ else {
+ $path = $prefix . $path;
+ $query = array();
+ if (!empty($path)) {
+ $query['q'] = $path;
+ }
+ if ($options['query']) {
+ // We do not use array_merge() here to prevent overriding $path via query
+ // parameters.
+ $query += $options['query'];
+ }
+ $query = $query ? ('?' . drupal_http_build_query($query)) : '';
+ $script = isset($options['script']) ? $options['script'] : '';
+ return $base . $script . $query . $options['fragment'];
+ }
+}
+
+/**
+ * Returns TRUE if a path is external to Drupal (e.g. http://example.com).
+ *
+ * If a path cannot be assessed by Drupal's menu handler, then we must
+ * treat it as potentially insecure.
+ *
+ * @param $path
+ * The internal path or external URL being linked to, such as "node/34" or
+ * "http://example.com/foo".
+ *
+ * @return
+ * Boolean TRUE or FALSE, where TRUE indicates an external path.
+ */
+function url_is_external($path) {
+ $colonpos = strpos($path, ':');
+ // Avoid calling drupal_strip_dangerous_protocols() if there is any
+ // slash (/), hash (#) or question_mark (?) before the colon (:)
+ // occurrence - if any - as this would clearly mean it is not a URL.
+ return $colonpos !== FALSE && !preg_match('![/?#]!', substr($path, 0, $colonpos)) && drupal_strip_dangerous_protocols($path) == $path;
+}
+
+/**
+ * Formats an attribute string for an HTTP header.
+ *
+ * @param $attributes
+ * An associative array of attributes such as 'rel'.
+ *
+ * @return
+ * A ; separated string ready for insertion in a HTTP header. No escaping is
+ * performed for HTML entities, so this string is not safe to be printed.
+ *
+ * @see drupal_add_http_header()
+ */
+function drupal_http_header_attributes(array $attributes = array()) {
+ foreach ($attributes as $attribute => &$data) {
+ if (is_array($data)) {
+ $data = implode(' ', $data);
+ }
+ $data = $attribute . '="' . $data . '"';
+ }
+ return $attributes ? ' ' . implode('; ', $attributes) : '';
+}
+
+/**
+ * Converts an associative array to an XML/HTML tag attribute string.
+ *
+ * Each array key and its value will be formatted into an attribute string.
+ * If a value is itself an array, then its elements are concatenated to a single
+ * space-delimited string (for example, a class attribute with multiple values).
+ *
+ * Attribute values are sanitized by running them through check_plain().
+ * Attribute names are not automatically sanitized. When using user-supplied
+ * attribute names, it is strongly recommended to allow only white-listed names,
+ * since certain attributes carry security risks and can be abused.
+ *
+ * Examples of security aspects when using drupal_attributes:
+ * @code
+ * // By running the value in the following statement through check_plain,
+ * // the malicious script is neutralized.
+ * drupal_attributes(array('title' => t('<script>steal_cookie();</script>')));
+ *
+ * // The statement below demonstrates dangerous use of drupal_attributes, and
+ * // will return an onmouseout attribute with JavaScript code that, when used
+ * // as attribute in a tag, will cause users to be redirected to another site.
+ * //
+ * // In this case, the 'onmouseout' attribute should not be whitelisted --
+ * // you don't want users to have the ability to add this attribute or others
+ * // that take JavaScript commands.
+ * drupal_attributes(array('onmouseout' => 'window.location="http://malicious.com/";')));
+ * @endcode
+ *
+ * @param $attributes
+ * An associative array of key-value pairs to be converted to attributes.
+ *
+ * @return
+ * A string ready for insertion in a tag (starts with a space).
+ *
+ * @ingroup sanitization
+ */
+function drupal_attributes(array $attributes = array()) {
+ foreach ($attributes as $attribute => &$data) {
+ $data = implode(' ', (array) $data);
+ $data = $attribute . '="' . check_plain($data) . '"';
+ }
+ return $attributes ? ' ' . implode(' ', $attributes) : '';
+}
+
+/**
+ * Formats an internal or external URL link as an HTML anchor tag.
+ *
+ * This function correctly handles aliased paths and adds an 'active' class
+ * attribute to links that point to the current page (for theming), so all
+ * internal links output by modules should be generated by this function if
+ * possible.
+ *
+ * However, for links enclosed in translatable text you should use t() and
+ * embed the HTML anchor tag directly in the translated string. For example:
+ * @code
+ * t('Visit the <a href="@url">settings</a> page', array('@url' => url('admin')));
+ * @endcode
+ * This keeps the context of the link title ('settings' in the example) for
+ * translators.
+ *
+ * @param string $text
+ * The translated link text for the anchor tag.
+ * @param string $path
+ * The internal path or external URL being linked to, such as "node/34" or
+ * "http://example.com/foo". After the url() function is called to construct
+ * the URL from $path and $options, the resulting URL is passed through
+ * check_plain() before it is inserted into the HTML anchor tag, to ensure
+ * well-formed HTML. See url() for more information and notes.
+ * @param array $options
+ * An associative array of additional options. Defaults to an empty array. It
+ * may contain the following elements.
+ * - 'attributes': An associative array of HTML attributes to apply to the
+ * anchor tag. If element 'class' is included, it must be an array; 'title'
+ * must be a string; other elements are more flexible, as they just need
+ * to work in a call to drupal_attributes($options['attributes']).
+ * - 'html' (default FALSE): Whether $text is HTML or just plain-text. For
+ * example, to make an image tag into a link, this must be set to TRUE, or
+ * you will see the escaped HTML image tag. $text is not sanitized if
+ * 'html' is TRUE. The calling function must ensure that $text is already
+ * safe.
+ * - 'language': An optional language object. If the path being linked to is
+ * internal to the site, $options['language'] is used to determine whether
+ * the link is "active", or pointing to the current page (the language as
+ * well as the path must match). This element is also used by url().
+ * - Additional $options elements used by the url() function.
+ *
+ * @return string
+ * An HTML string containing a link to the given path.
+ *
+ * @see url()
+ */
+function l($text, $path, array $options = array()) {
+ global $language_url;
+ static $use_theme = NULL;
+
+ // Merge in defaults.
+ $options += array(
+ 'attributes' => array(),
+ 'html' => FALSE,
+ );
+
+ // Append active class.
+ if (($path == $_GET['q'] || ($path == '<front>' && drupal_is_front_page())) &&
+ (empty($options['language']) || $options['language']->language == $language_url->language)) {
+ $options['attributes']['class'][] = 'active';
+ }
+
+ // Remove all HTML and PHP tags from a tooltip. For best performance, we act only
+ // if a quick strpos() pre-check gave a suspicion (because strip_tags() is expensive).
+ if (isset($options['attributes']['title']) && strpos($options['attributes']['title'], '<') !== FALSE) {
+ $options['attributes']['title'] = strip_tags($options['attributes']['title']);
+ }
+
+ // Determine if rendering of the link is to be done with a theme function
+ // or the inline default. Inline is faster, but if the theme system has been
+ // loaded and a module or theme implements a preprocess or process function
+ // or overrides the theme_link() function, then invoke theme(). Preliminary
+ // benchmarks indicate that invoking theme() can slow down the l() function
+ // by 20% or more, and that some of the link-heavy Drupal pages spend more
+ // than 10% of the total page request time in the l() function.
+ if (!isset($use_theme) && function_exists('theme')) {
+ // Allow edge cases to prevent theme initialization and force inline link
+ // rendering.
+ if (variable_get('theme_link', TRUE)) {
+ drupal_theme_initialize();
+ $registry = theme_get_registry(FALSE);
+ // We don't want to duplicate functionality that's in theme(), so any
+ // hint of a module or theme doing anything at all special with the 'link'
+ // theme hook should simply result in theme() being called. This includes
+ // the overriding of theme_link() with an alternate function or template,
+ // the presence of preprocess or process functions, or the presence of
+ // include files.
+ $use_theme = !isset($registry['link']['function']) || ($registry['link']['function'] != 'theme_link');
+ $use_theme = $use_theme || !empty($registry['link']['preprocess functions']) || !empty($registry['link']['process functions']) || !empty($registry['link']['includes']);
+ }
+ else {
+ $use_theme = FALSE;
+ }
+ }
+ if ($use_theme) {
+ return theme('link', array('text' => $text, 'path' => $path, 'options' => $options));
+ }
+ // The result of url() is a plain-text URL. Because we are using it here
+ // in an HTML argument context, we need to encode it properly.
+ return '<a href="' . check_plain(url($path, $options)) . '"' . drupal_attributes($options['attributes']) . '>' . ($options['html'] ? $text : check_plain($text)) . '</a>';
+}
+
+/**
+ * Delivers a page callback result to the browser in the appropriate format.
+ *
+ * This function is most commonly called by menu_execute_active_handler(), but
+ * can also be called by error conditions such as drupal_not_found(),
+ * drupal_access_denied(), and drupal_site_offline().
+ *
+ * When a user requests a page, index.php calls menu_execute_active_handler(),
+ * which calls the 'page callback' function registered in hook_menu(). The page
+ * callback function can return one of:
+ * - NULL: to indicate no content.
+ * - An integer menu status constant: to indicate an error condition.
+ * - A string of HTML content.
+ * - A renderable array of content.
+ * Returning a renderable array rather than a string of HTML is preferred,
+ * because that provides modules with more flexibility in customizing the final
+ * result.
+ *
+ * When the page callback returns its constructed content to
+ * menu_execute_active_handler(), this function gets called. The purpose of
+ * this function is to determine the most appropriate 'delivery callback'
+ * function to route the content to. The delivery callback function then
+ * sends the content to the browser in the needed format. The default delivery
+ * callback is drupal_deliver_html_page(), which delivers the content as an HTML
+ * page, complete with blocks in addition to the content. This default can be
+ * overridden on a per menu router item basis by setting 'delivery callback' in
+ * hook_menu() or hook_menu_alter(), and can also be overridden on a per request
+ * basis in hook_page_delivery_callback_alter().
+ *
+ * For example, the same page callback function can be used for an HTML
+ * version of the page and an Ajax version of the page. The page callback
+ * function just needs to decide what content is to be returned and the
+ * delivery callback function will send it as an HTML page or an Ajax
+ * response, as appropriate.
+ *
+ * In order for page callbacks to be reusable in different delivery formats,
+ * they should not issue any "print" or "echo" statements, but instead just
+ * return content.
+ *
+ * Also note that this function does not perform access checks. The delivery
+ * callback function specified in hook_menu(), hook_menu_alter(), or
+ * hook_page_delivery_callback_alter() will be called even if the router item
+ * access checks fail. This is intentional (it is needed for JSON and other
+ * purposes), but it has security implications. Do not call this function
+ * directly unless you understand the security implications, and be careful in
+ * writing delivery callbacks, so that they do not violate security. See
+ * drupal_deliver_html_page() for an example of a delivery callback that
+ * respects security.
+ *
+ * @param $page_callback_result
+ * The result of a page callback. Can be one of:
+ * - NULL: to indicate no content.
+ * - An integer menu status constant: to indicate an error condition.
+ * - A string of HTML content.
+ * - A renderable array of content.
+ * @param $default_delivery_callback
+ * (Optional) If given, it is the name of a delivery function most likely
+ * to be appropriate for the page request as determined by the calling
+ * function (e.g., menu_execute_active_handler()). If not given, it is
+ * determined from the menu router information of the current page.
+ *
+ * @see menu_execute_active_handler()
+ * @see hook_menu()
+ * @see hook_menu_alter()
+ * @see hook_page_delivery_callback_alter()
+ */
+function drupal_deliver_page($page_callback_result, $default_delivery_callback = NULL) {
+ if (!isset($default_delivery_callback) && ($router_item = menu_get_item())) {
+ $default_delivery_callback = $router_item['delivery_callback'];
+ }
+ $delivery_callback = !empty($default_delivery_callback) ? $default_delivery_callback : 'drupal_deliver_html_page';
+ // Give modules a chance to alter the delivery callback used, based on
+ // request-time context (e.g., HTTP request headers).
+ drupal_alter('page_delivery_callback', $delivery_callback);
+ if (function_exists($delivery_callback)) {
+ $delivery_callback($page_callback_result);
+ }
+ else {
+ // If a delivery callback is specified, but doesn't exist as a function,
+ // something is wrong, but don't print anything, since it's not known
+ // what format the response needs to be in.
+ watchdog('delivery callback not found', 'callback %callback not found: %q.', array('%callback' => $delivery_callback, '%q' => $_GET['q']), WATCHDOG_ERROR);
+ }
+}
+
+/**
+ * Packages and sends the result of a page callback to the browser as HTML.
+ *
+ * @param $page_callback_result
+ * The result of a page callback. Can be one of:
+ * - NULL: to indicate no content.
+ * - An integer menu status constant: to indicate an error condition.
+ * - A string of HTML content.
+ * - A renderable array of content.
+ *
+ * @see drupal_deliver_page()
+ */
+function drupal_deliver_html_page($page_callback_result) {
+ // Emit the correct charset HTTP header, but not if the page callback
+ // result is NULL, since that likely indicates that it printed something
+ // in which case, no further headers may be sent, and not if code running
+ // for this page request has already set the content type header.
+ if (isset($page_callback_result) && is_null(drupal_get_http_header('Content-Type'))) {
+ drupal_add_http_header('Content-Type', 'text/html; charset=utf-8');
+ }
+
+ // Send appropriate HTTP-Header for browsers and search engines.
+ global $language;
+ drupal_add_http_header('Content-Language', $language->language);
+
+ // Menu status constants are integers; page content is a string or array.
+ if (is_int($page_callback_result)) {
+ // @todo: Break these up into separate functions?
+ switch ($page_callback_result) {
+ case MENU_NOT_FOUND:
+ // Print a 404 page.
+ drupal_add_http_header('Status', '404 Not Found');
+
+ watchdog('page not found', check_plain($_GET['q']), NULL, WATCHDOG_WARNING);
+
+ // Check for and return a fast 404 page if configured.
+ drupal_fast_404();
+
+ // Keep old path for reference, and to allow forms to redirect to it.
+ if (!isset($_GET['destination'])) {
+ $_GET['destination'] = $_GET['q'];
+ }
+
+ $path = drupal_get_normal_path(variable_get('site_404', ''));
+ if ($path && $path != $_GET['q']) {
+ // Custom 404 handler. Set the active item in case there are tabs to
+ // display, or other dependencies on the path.
+ menu_set_active_item($path);
+ $return = menu_execute_active_handler($path, FALSE);
+ }
+
+ if (empty($return) || $return == MENU_NOT_FOUND || $return == MENU_ACCESS_DENIED) {
+ // Standard 404 handler.
+ drupal_set_title(t('Page not found'));
+ $return = t('The requested page "@path" could not be found.', array('@path' => request_uri()));
+ }
+
+ drupal_set_page_content($return);
+ $page = element_info('page');
+ print drupal_render_page($page);
+ break;
+
+ case MENU_ACCESS_DENIED:
+ // Print a 403 page.
+ drupal_add_http_header('Status', '403 Forbidden');
+ watchdog('access denied', check_plain($_GET['q']), NULL, WATCHDOG_WARNING);
+
+ // Keep old path for reference, and to allow forms to redirect to it.
+ if (!isset($_GET['destination'])) {
+ $_GET['destination'] = $_GET['q'];
+ }
+
+ $path = drupal_get_normal_path(variable_get('site_403', ''));
+ if ($path && $path != $_GET['q']) {
+ // Custom 403 handler. Set the active item in case there are tabs to
+ // display or other dependencies on the path.
+ menu_set_active_item($path);
+ $return = menu_execute_active_handler($path, FALSE);
+ }
+
+ if (empty($return) || $return == MENU_NOT_FOUND || $return == MENU_ACCESS_DENIED) {
+ // Standard 403 handler.
+ drupal_set_title(t('Access denied'));
+ $return = t('You are not authorized to access this page.');
+ }
+
+ print drupal_render_page($return);
+ break;
+
+ case MENU_SITE_OFFLINE:
+ // Print a 503 page.
+ drupal_maintenance_theme();
+ drupal_add_http_header('Status', '503 Service unavailable');
+ drupal_set_title(t('Site under maintenance'));
+ print theme('maintenance_page', array('content' => filter_xss_admin(variable_get('maintenance_mode_message',
+ t('@site is currently under maintenance. We should be back shortly. Thank you for your patience.', array('@site' => variable_get('site_name', 'Drupal')))))));
+ break;
+ }
+ }
+ elseif (isset($page_callback_result)) {
+ // Print anything besides a menu constant, assuming it's not NULL or
+ // undefined.
+ print drupal_render_page($page_callback_result);
+ }
+
+ // Perform end-of-request tasks.
+ drupal_page_footer();
+}
+
+/**
+ * Performs end-of-request tasks.
+ *
+ * This function sets the page cache if appropriate, and allows modules to
+ * react to the closing of the page by calling hook_exit().
+ */
+function drupal_page_footer() {
+ global $user;
+
+ module_invoke_all('exit');
+
+ // Commit the user session, if needed.
+ drupal_session_commit();
+
+ if (variable_get('cache', 0) && ($cache = drupal_page_set_cache())) {
+ drupal_serve_page_from_cache($cache);
+ }
+ else {
+ ob_flush();
+ }
+
+ _registry_check_code(REGISTRY_WRITE_LOOKUP_CACHE);
+ drupal_cache_system_paths();
+ module_implements_write_cache();
+ system_run_automated_cron();
+}
+
+/**
+ * Performs end-of-request tasks.
+ *
+ * In some cases page requests need to end without calling drupal_page_footer().
+ * In these cases, call drupal_exit() instead. There should rarely be a reason
+ * to call exit instead of drupal_exit();
+ *
+ * @param $destination
+ * If this function is called from drupal_goto(), then this argument
+ * will be a fully-qualified URL that is the destination of the redirect.
+ * This should be passed along to hook_exit() implementations.
+ */
+function drupal_exit($destination = NULL) {
+ if (drupal_get_bootstrap_phase() == DRUPAL_BOOTSTRAP_FULL) {
+ if (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') {
+ module_invoke_all('exit', $destination);
+ }
+ drupal_session_commit();
+ }
+ exit;
+}
+
+/**
+ * Forms an associative array from a linear array.
+ *
+ * This function walks through the provided array and constructs an associative
+ * array out of it. The keys of the resulting array will be the values of the
+ * input array. The values will be the same as the keys unless a function is
+ * specified, in which case the output of the function is used for the values
+ * instead.
+ *
+ * @param $array
+ * A linear array.
+ * @param $function
+ * A name of a function to apply to all values before output.
+ *
+ * @return
+ * An associative array.
+ */
+function drupal_map_assoc($array, $function = NULL) {
+ // array_combine() fails with empty arrays:
+ // http://bugs.php.net/bug.php?id=34857.
+ $array = !empty($array) ? array_combine($array, $array) : array();
+ if (is_callable($function)) {
+ $array = array_map($function, $array);
+ }
+ return $array;
+}
+
+/**
+ * Attempts to set the PHP maximum execution time.
+ *
+ * This function is a wrapper around the PHP function set_time_limit().
+ * When called, set_time_limit() restarts the timeout counter from zero.
+ * In other words, if the timeout is the default 30 seconds, and 25 seconds
+ * into script execution a call such as set_time_limit(20) is made, the
+ * script will run for a total of 45 seconds before timing out.
+ *
+ * It also means that it is possible to decrease the total time limit if
+ * the sum of the new time limit and the current time spent running the
+ * script is inferior to the original time limit. It is inherent to the way
+ * set_time_limit() works, it should rather be called with an appropriate
+ * value every time you need to allocate a certain amount of time
+ * to execute a task than only once at the beginning of the script.
+ *
+ * Before calling set_time_limit(), we check if this function is available
+ * because it could be disabled by the server administrator. We also hide all
+ * the errors that could occur when calling set_time_limit(), because it is
+ * not possible to reliably ensure that PHP or a security extension will
+ * not issue a warning/error if they prevent the use of this function.
+ *
+ * @param $time_limit
+ * An integer specifying the new time limit, in seconds. A value of 0
+ * indicates unlimited execution time.
+ *
+ * @ingroup php_wrappers
+ */
+function drupal_set_time_limit($time_limit) {
+ if (function_exists('set_time_limit')) {
+ @set_time_limit($time_limit);
+ }
+}
+
+/**
+ * Returns the path to a system item (module, theme, etc.).
+ *
+ * @param $type
+ * The type of the item (i.e. theme, theme_engine, module, profile).
+ * @param $name
+ * The name of the item for which the path is requested.
+ *
+ * @return
+ * The path to the requested item or an empty string if the item is not found.
+ */
+function drupal_get_path($type, $name) {
+ return dirname(drupal_get_filename($type, $name));
+}
+
+/**
+ * Returns the base URL path (i.e., directory) of the Drupal installation.
+ *
+ * base_path() adds a "/" to the beginning and end of the returned path if the
+ * path is not empty. At the very least, this will return "/".
+ *
+ * Examples:
+ * - http://example.com returns "/" because the path is empty.
+ * - http://example.com/drupal/folder returns "/drupal/folder/".
+ */
+function base_path() {
+ return $GLOBALS['base_path'];
+}
+
+/**
+ * Adds a LINK tag with a distinct 'rel' attribute to the page's HEAD.
+ *
+ * This function can be called as long the HTML header hasn't been sent, which
+ * on normal pages is up through the preprocess step of theme('html'). Adding
+ * a link will overwrite a prior link with the exact same 'rel' and 'href'
+ * attributes.
+ *
+ * @param $attributes
+ * Associative array of element attributes including 'href' and 'rel'.
+ * @param $header
+ * Optional flag to determine if a HTTP 'Link:' header should be sent.
+ */
+function drupal_add_html_head_link($attributes, $header = FALSE) {
+ $element = array(
+ '#tag' => 'link',
+ '#attributes' => $attributes,
+ );
+ $href = $attributes['href'];
+
+ if ($header) {
+ // Also add a HTTP header "Link:".
+ $href = '<' . check_plain($attributes['href']) . '>;';
+ unset($attributes['href']);
+ $element['#attached']['drupal_add_http_header'][] = array('Link', $href . drupal_http_header_attributes($attributes), TRUE);
+ }
+
+ drupal_add_html_head($element, 'drupal_add_html_head_link:' . $attributes['rel'] . ':' . $href);
+}
+
+/**
+ * Adds a cascading stylesheet to the stylesheet queue.
+ *
+ * Calling drupal_static_reset('drupal_add_css') will clear all cascading
+ * stylesheets added so far.
+ *
+ * If CSS aggregation/compression is enabled, all cascading style sheets added
+ * with $options['preprocess'] set to TRUE will be merged into one aggregate
+ * file and compressed by removing all extraneous white space.
+ * Preprocessed inline stylesheets will not be aggregated into this single file;
+ * instead, they are just compressed upon output on the page. Externally hosted
+ * stylesheets are never aggregated or compressed.
+ *
+ * The reason for aggregating the files is outlined quite thoroughly here:
+ * http://www.die.net/musings/page_load_time/ "Load fewer external objects. Due
+ * to request overhead, one bigger file just loads faster than two smaller ones
+ * half its size."
+ *
+ * $options['preprocess'] should be only set to TRUE when a file is required for
+ * all typical visitors and most pages of a site. It is critical that all
+ * preprocessed files are added unconditionally on every page, even if the
+ * files do not happen to be needed on a page. This is normally done by calling
+ * drupal_add_css() in a hook_init() implementation.
+ *
+ * Non-preprocessed files should only be added to the page when they are
+ * actually needed.
+ *
+ * @param $data
+ * (optional) The stylesheet data to be added, depending on what is passed
+ * through to the $options['type'] parameter:
+ * - 'file': The path to the CSS file relative to the base_path(), or a
+ * stream wrapper URI. For example: "modules/devel/devel.css" or
+ * "public://generated_css/stylesheet_1.css". Note that Modules should
+ * always prefix the names of their CSS files with the module name; for
+ * example, system-menus.css rather than simply menus.css. Themes can
+ * override module-supplied CSS files based on their filenames, and this
+ * prefixing helps prevent confusing name collisions for theme developers.
+ * See drupal_get_css() where the overrides are performed. Also, if the
+ * direction of the current language is right-to-left (Hebrew, Arabic,
+ * etc.), the function will also look for an RTL CSS file and append it to
+ * the list. The name of this file should have an '-rtl.css' suffix. For
+ * example, a CSS file called 'mymodule-name.css' will have a
+ * 'mymodule-name-rtl.css' file added to the list, if exists in the same
+ * directory. This CSS file should contain overrides for properties which
+ * should be reversed or otherwise different in a right-to-left display.
+ * - 'inline': A string of CSS that should be placed in the given scope. Note
+ * that it is better practice to use 'file' stylesheets, rather than
+ * 'inline', as the CSS would then be aggregated and cached.
+ * - 'external': The absolute path to an external CSS file that is not hosted
+ * on the local server. These files will not be aggregated if CSS
+ * aggregation is enabled.
+ * @param $options
+ * (optional) A string defining the 'type' of CSS that is being added in the
+ * $data parameter ('file', 'inline', or 'external'), or an array which can
+ * have any or all of the following keys:
+ * - 'type': The type of stylesheet being added. Available options are 'file',
+ * 'inline' or 'external'. Defaults to 'file'.
+ * - 'basename': Force a basename for the file being added. Modules are
+ * expected to use stylesheets with unique filenames, but integration of
+ * external libraries may make this impossible. The basename of
+ * 'modules/node/node.css' is 'node.css'. If the external library "node.js"
+ * ships with a 'node.css', then a different, unique basename would be
+ * 'node.js.css'.
+ * - 'group': A number identifying the group in which to add the stylesheet.
+ * Available constants are:
+ * - CSS_SYSTEM: Any system-layer CSS.
+ * - CSS_DEFAULT: (default) Any module-layer CSS.
+ * - CSS_THEME: Any theme-layer CSS.
+ * The group number serves as a weight: the markup for loading a stylesheet
+ * within a lower weight group is output to the page before the markup for
+ * loading a stylesheet within a higher weight group, so CSS within higher
+ * weight groups take precendence over CSS within lower weight groups.
+ * - 'every_page': For optimal front-end performance when aggregation is
+ * enabled, this should be set to TRUE if the stylesheet is present on every
+ * page of the website for users for whom it is present at all. This
+ * defaults to FALSE. It is set to TRUE for stylesheets added via module and
+ * theme .info files. Modules that add stylesheets within hook_init()
+ * implementations, or from other code that ensures that the stylesheet is
+ * added to all website pages, should also set this flag to TRUE. All
+ * stylesheets within the same group that have the 'every_page' flag set to
+ * TRUE and do not have 'preprocess' set to FALSE are aggregated together
+ * into a single aggregate file, and that aggregate file can be reused
+ * across a user's entire site visit, leading to faster navigation between
+ * pages. However, stylesheets that are only needed on pages less frequently
+ * visited, can be added by code that only runs for those particular pages,
+ * and that code should not set the 'every_page' flag. This minimizes the
+ * size of the aggregate file that the user needs to download when first
+ * visiting the website. Stylesheets without the 'every_page' flag are
+ * aggregated into a separate aggregate file. This other aggregate file is
+ * likely to change from page to page, and each new aggregate file needs to
+ * be downloaded when first encountered, so it should be kept relatively
+ * small by ensuring that most commonly needed stylesheets are added to
+ * every page.
+ * - 'weight': The weight of the stylesheet specifies the order in which the
+ * CSS will appear relative to other stylesheets with the same group and
+ * 'every_page' flag. The exact ordering of stylesheets is as follows:
+ * - First by group.
+ * - Then by the 'every_page' flag, with TRUE coming before FALSE.
+ * - Then by weight.
+ * - Then by the order in which the CSS was added. For example, all else
+ * being the same, a stylesheet added by a call to drupal_add_css() that
+ * happened later in the page request gets added to the page after one for
+ * which drupal_add_css() happened earlier in the page request.
+ * - 'media': The media type for the stylesheet, e.g., all, print, screen.
+ * Defaults to 'all'.
+ * - 'preprocess': If TRUE and CSS aggregation/compression is enabled, the
+ * styles will be aggregated and compressed. Defaults to TRUE.
+ * - 'browsers': An array containing information specifying which browsers
+ * should load the CSS item. See drupal_pre_render_conditional_comments()
+ * for details.
+ *
+ * @return
+ * An array of queued cascading stylesheets.
+ *
+ * @see drupal_get_css()
+ */
+function drupal_add_css($data = NULL, $options = NULL) {
+ $css = &drupal_static(__FUNCTION__, array());
+
+ // Construct the options, taking the defaults into consideration.
+ if (isset($options)) {
+ if (!is_array($options)) {
+ $options = array('type' => $options);
+ }
+ }
+ else {
+ $options = array();
+ }
+
+ // Create an array of CSS files for each media type first, since each type needs to be served
+ // to the browser differently.
+ if (isset($data)) {
+ $options += array(
+ 'type' => 'file',
+ 'group' => CSS_DEFAULT,
+ 'weight' => 0,
+ 'every_page' => FALSE,
+ 'media' => 'all',
+ 'preprocess' => TRUE,
+ 'data' => $data,
+ 'browsers' => array(),
+ );
+ $options['browsers'] += array(
+ 'IE' => TRUE,
+ '!IE' => TRUE,
+ );
+
+ // Files with a query string cannot be preprocessed.
+ if ($options['type'] === 'file' && $options['preprocess'] && strpos($options['data'], '?') !== FALSE) {
+ $options['preprocess'] = FALSE;
+ }
+
+ // Always add a tiny value to the weight, to conserve the insertion order.
+ $options['weight'] += count($css) / 1000;
+
+ // Add the data to the CSS array depending on the type.
+ switch ($options['type']) {
+ case 'inline':
+ // For inline stylesheets, we don't want to use the $data as the array
+ // key as $data could be a very long string of CSS.
+ $css[] = $options;
+ break;
+ default:
+ // Local and external files must keep their name as the associative key
+ // so the same CSS file is not be added twice.
+ $css[$data] = $options;
+ }
+ }
+
+ return $css;
+}
+
+/**
+ * Returns a themed representation of all stylesheets to attach to the page.
+ *
+ * It loads the CSS in order, with 'module' first, then 'theme' afterwards.
+ * This ensures proper cascading of styles so themes can easily override
+ * module styles through CSS selectors.
+ *
+ * Themes may replace module-defined CSS files by adding a stylesheet with the
+ * same filename. For example, themes/bartik/system-menus.css would replace
+ * modules/system/system-menus.css. This allows themes to override complete
+ * CSS files, rather than specific selectors, when necessary.
+ *
+ * If the original CSS file is being overridden by a theme, the theme is
+ * responsible for supplying an accompanying RTL CSS file to replace the
+ * module's.
+ *
+ * @param $css
+ * (optional) An array of CSS files. If no array is provided, the default
+ * stylesheets array is used instead.
+ * @param $skip_alter
+ * (optional) If set to TRUE, this function skips calling drupal_alter() on
+ * $css, useful when the calling function passes a $css array that has already
+ * been altered.
+ *
+ * @return
+ * A string of XHTML CSS tags.
+ *
+ * @see drupal_add_css()
+ */
+function drupal_get_css($css = NULL, $skip_alter = FALSE) {
+ if (!isset($css)) {
+ $css = drupal_add_css();
+ }
+
+ // Allow modules and themes to alter the CSS items.
+ if (!$skip_alter) {
+ drupal_alter('css', $css);
+ }
+
+ // Sort CSS items, so that they appear in the correct order.
+ uasort($css, 'drupal_sort_css_js');
+
+ // Provide the page with information about the individual CSS files used,
+ // information not otherwise available when CSS aggregation is enabled. The
+ // setting is attached later in this function, but is set here, so that CSS
+ // files removed below are still considered "used" and prevented from being
+ // added in a later AJAX request.
+ // Skip if no files were added to the page or jQuery.extend() will overwrite
+ // the Drupal.settings.ajaxPageState.css object with an empty array.
+ if (!empty($css)) {
+ // Cast the array to an object to be on the safe side even if not empty.
+ $setting['ajaxPageState']['css'] = (object) array_fill_keys(array_keys($css), 1);
+ }
+
+ // Remove the overridden CSS files. Later CSS files override former ones.
+ $previous_item = array();
+ foreach ($css as $key => $item) {
+ if ($item['type'] == 'file') {
+ // If defined, force a unique basename for this file.
+ $basename = isset($item['basename']) ? $item['basename'] : drupal_basename($item['data']);
+ if (isset($previous_item[$basename])) {
+ // Remove the previous item that shared the same base name.
+ unset($css[$previous_item[$basename]]);
+ }
+ $previous_item[$basename] = $key;
+ }
+ }
+
+ // Render the HTML needed to load the CSS.
+ $styles = array(
+ '#type' => 'styles',
+ '#items' => $css,
+ );
+
+ if (!empty($setting)) {
+ $styles['#attached']['js'][] = array('type' => 'setting', 'data' => $setting);
+ }
+
+ return drupal_render($styles);
+}
+
+/**
+ * Sorts CSS and JavaScript resources.
+ *
+ * Callback for uasort() within:
+ * - drupal_get_css()
+ * - drupal_get_js()
+ *
+ * This sort order helps optimize front-end performance while providing modules
+ * and themes with the necessary control for ordering the CSS and JavaScript
+ * appearing on a page.
+ *
+ * @param $a
+ * First item for comparison. The compared items should be associative arrays
+ * of member items from drupal_add_css() or drupal_add_js().
+ * @param $b
+ * Second item for comparison.
+ *
+ * @see drupal_add_css()
+ * @see drupal_add_js()
+ */
+function drupal_sort_css_js($a, $b) {
+ // First order by group, so that, for example, all items in the CSS_SYSTEM
+ // group appear before items in the CSS_DEFAULT group, which appear before
+ // all items in the CSS_THEME group. Modules may create additional groups by
+ // defining their own constants.
+ if ($a['group'] < $b['group']) {
+ return -1;
+ }
+ elseif ($a['group'] > $b['group']) {
+ return 1;
+ }
+ // Within a group, order all infrequently needed, page-specific files after
+ // common files needed throughout the website. Separating this way allows for
+ // the aggregate file generated for all of the common files to be reused
+ // across a site visit without being cut by a page using a less common file.
+ elseif ($a['every_page'] && !$b['every_page']) {
+ return -1;
+ }
+ elseif (!$a['every_page'] && $b['every_page']) {
+ return 1;
+ }
+ // Finally, order by weight.
+ elseif ($a['weight'] < $b['weight']) {
+ return -1;
+ }
+ elseif ($a['weight'] > $b['weight']) {
+ return 1;
+ }
+ else {
+ return 0;
+ }
+}
+
+/**
+ * Default callback to group CSS items.
+ *
+ * This function arranges the CSS items that are in the #items property of the
+ * styles element into groups. Arranging the CSS items into groups serves two
+ * purposes. When aggregation is enabled, files within a group are aggregated
+ * into a single file, significantly improving page loading performance by
+ * minimizing network traffic overhead. When aggregation is disabled, grouping
+ * allows multiple files to be loaded from a single STYLE tag, enabling sites
+ * with many modules enabled or a complex theme being used to stay within IE's
+ * 31 CSS inclusion tag limit: http://drupal.org/node/228818.
+ *
+ * This function puts multiple items into the same group if they are groupable
+ * and if they are for the same 'media' and 'browsers'. Items of the 'file' type
+ * are groupable if their 'preprocess' flag is TRUE, items of the 'inline' type
+ * are always groupable, and items of the 'external' type are never groupable.
+ * This function also ensures that the process of grouping items does not change
+ * their relative order. This requirement may result in multiple groups for the
+ * same type, media, and browsers, if needed to accommodate other items in
+ * between.
+ *
+ * @param $css
+ * An array of CSS items, as returned by drupal_add_css(), but after
+ * alteration performed by drupal_get_css().
+ *
+ * @return
+ * An array of CSS groups. Each group contains the same keys (e.g., 'media',
+ * 'data', etc.) as a CSS item from the $css parameter, with the value of
+ * each key applying to the group as a whole. Each group also contains an
+ * 'items' key, which is the subset of items from $css that are in the group.
+ *
+ * @see drupal_pre_render_styles()
+ * @see system_element_info()
+ */
+function drupal_group_css($css) {
+ $groups = array();
+ // If a group can contain multiple items, we track the information that must
+ // be the same for each item in the group, so that when we iterate the next
+ // item, we can determine if it can be put into the current group, or if a
+ // new group needs to be made for it.
+ $current_group_keys = NULL;
+ // When creating a new group, we pre-increment $i, so by initializing it to
+ // -1, the first group will have index 0.
+ $i = -1;
+ foreach ($css as $item) {
+ // The browsers for which the CSS item needs to be loaded is part of the
+ // information that determines when a new group is needed, but the order of
+ // keys in the array doesn't matter, and we don't want a new group if all
+ // that's different is that order.
+ ksort($item['browsers']);
+
+ // If the item can be grouped with other items, set $group_keys to an array
+ // of information that must be the same for all items in its group. If the
+ // item can't be grouped with other items, set $group_keys to FALSE. We
+ // put items into a group that can be aggregated together: whether they will
+ // be aggregated is up to the _drupal_css_aggregate() function or an
+ // override of that function specified in hook_css_alter(), but regardless
+ // of the details of that function, a group represents items that can be
+ // aggregated. Since a group may be rendered with a single HTML tag, all
+ // items in the group must share the same information that would need to be
+ // part of that HTML tag.
+ switch ($item['type']) {
+ case 'file':
+ // Group file items if their 'preprocess' flag is TRUE.
+ // Help ensure maximum reuse of aggregate files by only grouping
+ // together items that share the same 'group' value and 'every_page'
+ // flag. See drupal_add_css() for details about that.
+ $group_keys = $item['preprocess'] ? array($item['type'], $item['group'], $item['every_page'], $item['media'], $item['browsers']) : FALSE;
+ break;
+ case 'inline':
+ // Always group inline items.
+ $group_keys = array($item['type'], $item['media'], $item['browsers']);
+ break;
+ case 'external':
+ // Do not group external items.
+ $group_keys = FALSE;
+ break;
+ }
+
+ // If the group keys don't match the most recent group we're working with,
+ // then a new group must be made.
+ if ($group_keys !== $current_group_keys) {
+ $i++;
+ // Initialize the new group with the same properties as the first item
+ // being placed into it. The item's 'data' and 'weight' properties are
+ // unique to the item and should not be carried over to the group.
+ $groups[$i] = $item;
+ unset($groups[$i]['data'], $groups[$i]['weight']);
+ $groups[$i]['items'] = array();
+ $current_group_keys = $group_keys ? $group_keys : NULL;
+ }
+
+ // Add the item to the current group.
+ $groups[$i]['items'][] = $item;
+ }
+ return $groups;
+}
+
+/**
+ * Default callback to aggregate CSS files and inline content.
+ *
+ * Having the browser load fewer CSS files results in much faster page loads
+ * than when it loads many small files. This function aggregates files within
+ * the same group into a single file unless the site-wide setting to do so is
+ * disabled (commonly the case during site development). To optimize download,
+ * it also compresses the aggregate files by removing comments, whitespace, and
+ * other unnecessary content. Additionally, this functions aggregates inline
+ * content together, regardless of the site-wide aggregation setting.
+ *
+ * @param $css_groups
+ * An array of CSS groups as returned by drupal_group_css(). This function
+ * modifies the group's 'data' property for each group that is aggregated.
+ *
+ * @see drupal_group_css()
+ * @see drupal_pre_render_styles()
+ * @see system_element_info()
+ */
+function drupal_aggregate_css(&$css_groups) {
+ $preprocess_css = (variable_get('preprocess_css', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
+
+ // For each group that needs aggregation, aggregate its items.
+ foreach ($css_groups as $key => $group) {
+ switch ($group['type']) {
+ // If a file group can be aggregated into a single file, do so, and set
+ // the group's data property to the file path of the aggregate file.
+ case 'file':
+ if ($group['preprocess'] && $preprocess_css) {
+ $css_groups[$key]['data'] = drupal_build_css_cache($group['items']);
+ }
+ break;
+ // Aggregate all inline CSS content into the group's data property.
+ case 'inline':
+ $css_groups[$key]['data'] = '';
+ foreach ($group['items'] as $item) {
+ $css_groups[$key]['data'] .= drupal_load_stylesheet_content($item['data'], $item['preprocess']);
+ }
+ break;
+ }
+ }
+}
+
+/**
+ * #pre_render callback to add the elements needed for CSS tags to be rendered.
+ *
+ * For production websites, LINK tags are preferable to STYLE tags with @import
+ * statements, because:
+ * - They are the standard tag intended for linking to a resource.
+ * - On Firefox 2 and perhaps other browsers, CSS files included with @import
+ * statements don't get saved when saving the complete web page for offline
+ * use: http://drupal.org/node/145218.
+ * - On IE, if only LINK tags and no @import statements are used, all the CSS
+ * files are downloaded in parallel, resulting in faster page load, but if
+ * @import statements are used and span across multiple STYLE tags, all the
+ * ones from one STYLE tag must be downloaded before downloading begins for
+ * the next STYLE tag. Furthermore, IE7 does not support media declaration on
+ * the @import statement, so multiple STYLE tags must be used when different
+ * files are for different media types. Non-IE browsers always download in
+ * parallel, so this is an IE-specific performance quirk:
+ * http://www.stevesouders.com/blog/2009/04/09/dont-use-import/.
+ *
+ * However, IE has an annoying limit of 31 total CSS inclusion tags
+ * (http://drupal.org/node/228818) and LINK tags are limited to one file per
+ * tag, whereas STYLE tags can contain multiple @import statements allowing
+ * multiple files to be loaded per tag. When CSS aggregation is disabled, a
+ * Drupal site can easily have more than 31 CSS files that need to be loaded, so
+ * using LINK tags exclusively would result in a site that would display
+ * incorrectly in IE. Depending on different needs, different strategies can be
+ * employed to decide when to use LINK tags and when to use STYLE tags.
+ *
+ * The strategy employed by this function is to use LINK tags for all aggregate
+ * files and for all files that cannot be aggregated (e.g., if 'preprocess' is
+ * set to FALSE or the type is 'external'), and to use STYLE tags for groups
+ * of files that could be aggregated together but aren't (e.g., if the site-wide
+ * aggregation setting is disabled). This results in all LINK tags when
+ * aggregation is enabled, a guarantee that as many or only slightly more tags
+ * are used with aggregation disabled than enabled (so that if the limit were to
+ * be crossed with aggregation enabled, the site developer would also notice the
+ * problem while aggregation is disabled), and an easy way for a developer to
+ * view HTML source while aggregation is disabled and know what files will be
+ * aggregated together when aggregation becomes enabled.
+ *
+ * This function evaluates the aggregation enabled/disabled condition on a group
+ * by group basis by testing whether an aggregate file has been made for the
+ * group rather than by testing the site-wide aggregation setting. This allows
+ * this function to work correctly even if modules have implemented custom
+ * logic for grouping and aggregating files.
+ *
+ * @param $element
+ * A render array containing:
+ * - '#items': The CSS items as returned by drupal_add_css() and altered by
+ * drupal_get_css().
+ * - '#group_callback': A function to call to group #items to enable the use
+ * of fewer tags by aggregating files and/or using multiple @import
+ * statements within a single tag.
+ * - '#aggregate_callback': A function to call to aggregate the items within
+ * the groups arranged by the #group_callback function.
+ *
+ * @return
+ * A render array that will render to a string of XHTML CSS tags.
+ *
+ * @see drupal_get_css()
+ */
+function drupal_pre_render_styles($elements) {
+ // Group and aggregate the items.
+ if (isset($elements['#group_callback'])) {
+ $elements['#groups'] = $elements['#group_callback']($elements['#items']);
+ }
+ if (isset($elements['#aggregate_callback'])) {
+ $elements['#aggregate_callback']($elements['#groups']);
+ }
+
+ // A dummy query-string is added to filenames, to gain control over
+ // browser-caching. The string changes on every update or full cache
+ // flush, forcing browsers to load a new copy of the files, as the
+ // URL changed.
+ $query_string = variable_get('css_js_query_string', '0');
+
+ // For inline CSS to validate as XHTML, all CSS containing XHTML needs to be
+ // wrapped in CDATA. To make that backwards compatible with HTML 4, we need to
+ // comment out the CDATA-tag.
+ $embed_prefix = "\n<!--/*--><![CDATA[/*><!--*/\n";
+ $embed_suffix = "\n/*]]>*/-->\n";
+
+ // Defaults for LINK and STYLE elements.
+ $link_element_defaults = array(
+ '#type' => 'html_tag',
+ '#tag' => 'link',
+ '#attributes' => array(
+ 'type' => 'text/css',
+ 'rel' => 'stylesheet',
+ ),
+ );
+ $style_element_defaults = array(
+ '#type' => 'html_tag',
+ '#tag' => 'style',
+ '#attributes' => array(
+ 'type' => 'text/css',
+ ),
+ );
+
+ // Loop through each group.
+ foreach ($elements['#groups'] as $group) {
+ switch ($group['type']) {
+ // For file items, there are three possibilites.
+ // - The group has been aggregated: in this case, output a LINK tag for
+ // the aggregate file.
+ // - The group can be aggregated but has not been (most likely because
+ // the site administrator disabled the site-wide setting): in this case,
+ // output as few STYLE tags for the group as possible, using @import
+ // statement for each file in the group. This enables us to stay within
+ // IE's limit of 31 total CSS inclusion tags.
+ // - The group contains items not eligible for aggregation (their
+ // 'preprocess' flag has been set to FALSE): in this case, output a LINK
+ // tag for each file.
+ case 'file':
+ // The group has been aggregated into a single file: output a LINK tag
+ // for the aggregate file.
+ if (isset($group['data'])) {
+ $element = $link_element_defaults;
+ $element['#attributes']['href'] = file_create_url($group['data']);
+ $element['#attributes']['media'] = $group['media'];
+ $element['#browsers'] = $group['browsers'];
+ $elements[] = $element;
+ }
+ // The group can be aggregated, but hasn't been: combine multiple items
+ // into as few STYLE tags as possible.
+ elseif ($group['preprocess']) {
+ $import = array();
+ foreach ($group['items'] as $item) {
+ // A theme's .info file may have an entry for a file that doesn't
+ // exist as a way of overriding a module or base theme CSS file from
+ // being added to the page. Normally, file_exists() calls that need
+ // to run for every page request should be minimized, but this one
+ // is okay, because it only runs when CSS aggregation is disabled.
+ // On a server under heavy enough load that file_exists() calls need
+ // to be minimized, CSS aggregation should be enabled, in which case
+ // this code is not run. When aggregation is enabled,
+ // drupal_load_stylesheet() checks file_exists(), but only when
+ // building the aggregate file, which is then reused for many page
+ // requests.
+ if (file_exists($item['data'])) {
+ // The dummy query string needs to be added to the URL to control
+ // browser-caching. IE7 does not support a media type on the
+ // @import statement, so we instead specify the media for the
+ // group on the STYLE tag.
+ $import[] = '@import url("' . check_plain(file_create_url($item['data']) . '?' . $query_string) . '");';
+ }
+ }
+ // In addition to IE's limit of 31 total CSS inclusion tags, it also
+ // has a limit of 31 @import statements per STYLE tag.
+ while (!empty($import)) {
+ $import_batch = array_slice($import, 0, 31);
+ $import = array_slice($import, 31);
+ $element = $style_element_defaults;
+ $element['#value'] = implode("\n", $import_batch);
+ $element['#attributes']['media'] = $group['media'];
+ $element['#browsers'] = $group['browsers'];
+ $elements[] = $element;
+ }
+ }
+ // The group contains items ineligible for aggregation: output a LINK
+ // tag for each file.
+ else {
+ foreach ($group['items'] as $item) {
+ $element = $link_element_defaults;
+ // We do not check file_exists() here, because this code runs for
+ // files whose 'preprocess' is set to FALSE, and therefore, even
+ // when aggregation is enabled, and we want to avoid needlessly
+ // taxing a server that may be under heavy load. The file_exists()
+ // performed above for files whose 'preprocess' is TRUE is done for
+ // the benefit of theme .info files, but code that deals with files
+ // whose 'preprocess' is FALSE is responsible for ensuring the file
+ // exists.
+ // The dummy query string needs to be added to the URL to control
+ // browser-caching.
+ $query_string_separator = (strpos($item['data'], '?') !== FALSE) ? '&' : '?';
+ $element['#attributes']['href'] = file_create_url($item['data']) . $query_string_separator . $query_string;
+ $element['#attributes']['media'] = $item['media'];
+ $element['#browsers'] = $group['browsers'];
+ $elements[] = $element;
+ }
+ }
+ break;
+ // For inline content, the 'data' property contains the CSS content. If
+ // the group's 'data' property is set, then output it in a single STYLE
+ // tag. Otherwise, output a separate STYLE tag for each item.
+ case 'inline':
+ if (isset($group['data'])) {
+ $element = $style_element_defaults;
+ $element['#value'] = $group['data'];
+ $element['#value_prefix'] = $embed_prefix;
+ $element['#value_suffix'] = $embed_suffix;
+ $element['#attributes']['media'] = $group['media'];
+ $element['#browsers'] = $group['browsers'];
+ $elements[] = $element;
+ }
+ else {
+ foreach ($group['items'] as $item) {
+ $element = $style_element_defaults;
+ $element['#value'] = $item['data'];
+ $element['#value_prefix'] = $embed_prefix;
+ $element['#value_suffix'] = $embed_suffix;
+ $element['#attributes']['media'] = $item['media'];
+ $element['#browsers'] = $group['browsers'];
+ $elements[] = $element;
+ }
+ }
+ break;
+ // Output a LINK tag for each external item. The item's 'data' property
+ // contains the full URL.
+ case 'external':
+ foreach ($group['items'] as $item) {
+ $element = $link_element_defaults;
+ $element['#attributes']['href'] = $item['data'];
+ $element['#attributes']['media'] = $item['media'];
+ $element['#browsers'] = $group['browsers'];
+ $elements[] = $element;
+ }
+ break;
+ }
+ }
+
+ return $elements;
+}
+
+/**
+ * Aggregates and optimizes CSS files into a cache file in the files directory.
+ *
+ * The file name for the CSS cache file is generated from the hash of the
+ * aggregated contents of the files in $css. This forces proxies and browsers
+ * to download new CSS when the CSS changes.
+ *
+ * The cache file name is retrieved on a page load via a lookup variable that
+ * contains an associative array. The array key is the hash of the file names
+ * in $css while the value is the cache file name. The cache file is generated
+ * in two cases. First, if there is no file name value for the key, which will
+ * happen if a new file name has been added to $css or after the lookup
+ * variable is emptied to force a rebuild of the cache. Second, the cache file
+ * is generated if it is missing on disk. Old cache files are not deleted
+ * immediately when the lookup variable is emptied, but are deleted after a set
+ * period by drupal_delete_file_if_stale(). This ensures that files referenced
+ * by a cached page will still be available.
+ *
+ * @param $css
+ * An array of CSS files to aggregate and compress into one file.
+ *
+ * @return
+ * The URI of the CSS cache file, or FALSE if the file could not be saved.
+ */
+function drupal_build_css_cache($css) {
+ $data = '';
+ $uri = '';
+ $map = variable_get('drupal_css_cache_files', array());
+ // Create a new array so that only the file names are used to create the hash.
+ // This prevents new aggregates from being created unnecessarily.
+ $css_data = array();
+ foreach ($css as $css_file) {
+ $css_data[] = $css_file['data'];
+ }
+ $key = hash('sha256', serialize($css_data));
+ if (isset($map[$key])) {
+ $uri = $map[$key];
+ }
+
+ if (empty($uri) || !file_exists($uri)) {
+ // Build aggregate CSS file.
+ foreach ($css as $stylesheet) {
+ // Only 'file' stylesheets can be aggregated.
+ if ($stylesheet['type'] == 'file') {
+ $contents = drupal_load_stylesheet($stylesheet['data'], TRUE);
+
+ // Build the base URL of this CSS file: start with the full URL.
+ $css_base_url = file_create_url($stylesheet['data']);
+ // Move to the parent.
+ $css_base_url = substr($css_base_url, 0, strrpos($css_base_url, '/'));
+ // Simplify to a relative URL if the stylesheet URL starts with the
+ // base URL of the website.
+ if (substr($css_base_url, 0, strlen($GLOBALS['base_root'])) == $GLOBALS['base_root']) {
+ $css_base_url = substr($css_base_url, strlen($GLOBALS['base_root']));
+ }
+
+ _drupal_build_css_path(NULL, $css_base_url . '/');
+ // Anchor all paths in the CSS with its base URL, ignoring external and absolute paths.
+ $data .= preg_replace_callback('/url\(\s*[\'"]?(?![a-z]+:|\/+)([^\'")]+)[\'"]?\s*\)/i', '_drupal_build_css_path', $contents);
+ }
+ }
+
+ // Per the W3C specification at http://www.w3.org/TR/REC-CSS2/cascade.html#at-import,
+ // @import rules must proceed any other style, so we move those to the top.
+ $regexp = '/@import[^;]+;/i';
+ preg_match_all($regexp, $data, $matches);
+ $data = preg_replace($regexp, '', $data);
+ $data = implode('', $matches[0]) . $data;
+
+ // Prefix filename to prevent blocking by firewalls which reject files
+ // starting with "ad*".
+ $filename = 'css_' . drupal_hash_base64($data) . '.css';
+ // Create the css/ within the files folder.
+ $csspath = 'public://css';
+ $uri = $csspath . '/' . $filename;
+ // Create the CSS file.
+ file_prepare_directory($csspath, FILE_CREATE_DIRECTORY);
+ if (!file_exists($uri) && !file_unmanaged_save_data($data, $uri, FILE_EXISTS_REPLACE)) {
+ return FALSE;
+ }
+ // If CSS gzip compression is enabled, clean URLs are enabled (which means
+ // that rewrite rules are working) and the zlib extension is available then
+ // create a gzipped version of this file. This file is served conditionally
+ // to browsers that accept gzip using .htaccess rules.
+ if (variable_get('css_gzip_compression', TRUE) && variable_get('clean_url', 0) && extension_loaded('zlib')) {
+ if (!file_exists($uri . '.gz') && !file_unmanaged_save_data(gzencode($data, 9, FORCE_GZIP), $uri . '.gz', FILE_EXISTS_REPLACE)) {
+ return FALSE;
+ }
+ }
+ // Save the updated map.
+ $map[$key] = $uri;
+ variable_set('drupal_css_cache_files', $map);
+ }
+ return $uri;
+}
+
+/**
+ * Prefixes all paths within a CSS file for drupal_build_css_cache().
+ */
+function _drupal_build_css_path($matches, $base = NULL) {
+ $_base = &drupal_static(__FUNCTION__);
+ // Store base path for preg_replace_callback.
+ if (isset($base)) {
+ $_base = $base;
+ }
+
+ // Prefix with base and remove '../' segments where possible.
+ $path = $_base . $matches[1];
+ $last = '';
+ while ($path != $last) {
+ $last = $path;
+ $path = preg_replace('`(^|/)(?!\.\./)([^/]+)/\.\./`', '$1', $path);
+ }
+ return 'url(' . $path . ')';
+}
+
+/**
+ * Loads the stylesheet and resolves all @import commands.
+ *
+ * Loads a stylesheet and replaces @import commands with the contents of the
+ * imported file. Use this instead of file_get_contents when processing
+ * stylesheets.
+ *
+ * The returned contents are compressed removing white space and comments only
+ * when CSS aggregation is enabled. This optimization will not apply for
+ * color.module enabled themes with CSS aggregation turned off.
+ *
+ * @param $file
+ * Name of the stylesheet to be processed.
+ * @param $optimize
+ * Defines if CSS contents should be compressed or not.
+ * @param $reset_basepath
+ * Used internally to facilitate recursive resolution of @import commands.
+ *
+ * @return
+ * Contents of the stylesheet, including any resolved @import commands.
+ */
+function drupal_load_stylesheet($file, $optimize = NULL, $reset_basepath = TRUE) {
+ // These statics are not cache variables, so we don't use drupal_static().
+ static $_optimize, $basepath;
+ if ($reset_basepath) {
+ $basepath = '';
+ }
+ // Store the value of $optimize for preg_replace_callback with nested
+ // @import loops.
+ if (isset($optimize)) {
+ $_optimize = $optimize;
+ }
+
+ // Stylesheets are relative one to each other. Start by adding a base path
+ // prefix provided by the parent stylesheet (if necessary).
+ if ($basepath && !file_uri_scheme($file)) {
+ $file = $basepath . '/' . $file;
+ }
+ // Store the parent base path to restore it later.
+ $parent_base_path = $basepath;
+ // Set the current base path to process possible child imports.
+ $basepath = dirname($file);
+
+ // Load the CSS stylesheet. We suppress errors because themes may specify
+ // stylesheets in their .info file that don't exist in the theme's path,
+ // but are merely there to disable certain module CSS files.
+ $content = '';
+ if ($contents = @file_get_contents($file)) {
+ // Return the processed stylesheet.
+ $content = drupal_load_stylesheet_content($contents, $_optimize);
+ }
+
+ // Restore the parent base path as the file and its childen are processed.
+ $basepath = $parent_base_path;
+ return $content;
+}
+
+/**
+ * Processes the contents of a stylesheet for aggregation.
+ *
+ * @param $contents
+ * The contents of the stylesheet.
+ * @param $optimize
+ * (optional) Boolean whether CSS contents should be minified. Defaults to
+ * FALSE.
+ *
+ * @return
+ * Contents of the stylesheet including the imported stylesheets.
+ */
+function drupal_load_stylesheet_content($contents, $optimize = FALSE) {
+ // Remove multiple charset declarations for standards compliance (and fixing Safari problems).
+ $contents = preg_replace('/^@charset\s+[\'"](\S*?)\b[\'"];/i', '', $contents);
+
+ if ($optimize) {
+ // Perform some safe CSS optimizations.
+ // Regexp to match comment blocks.
+ $comment = '/\*[^*]*\*+(?:[^/*][^*]*\*+)*/';
+ // Regexp to match double quoted strings.
+ $double_quot = '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"';
+ // Regexp to match single quoted strings.
+ $single_quot = "'[^'\\\\]*(?:\\\\.[^'\\\\]*)*'";
+ // Strip all comment blocks, but keep double/single quoted strings.
+ $contents = preg_replace(
+ "<($double_quot|$single_quot)|$comment>Ss",
+ "$1",
+ $contents
+ );
+ // Remove certain whitespace.
+ // There are different conditions for removing leading and trailing
+ // whitespace.
+ // @see http://php.net/manual/regexp.reference.subpatterns.php
+ $contents = preg_replace('<
+ # Strip leading and trailing whitespace.
+ \s*([@{};,])\s*
+ # Strip only leading whitespace from:
+ # - Closing parenthesis: Retain "@media (bar) and foo".
+ | \s+([\)])
+ # Strip only trailing whitespace from:
+ # - Opening parenthesis: Retain "@media (bar) and foo".
+ # - Colon: Retain :pseudo-selectors.
+ | ([\(:])\s+
+ >xS',
+ // Only one of the three capturing groups will match, so its reference
+ // will contain the wanted value and the references for the
+ // two non-matching groups will be replaced with empty strings.
+ '$1$2$3',
+ $contents
+ );
+ // End the file with a new line.
+ $contents = trim($contents);
+ $contents .= "\n";
+ }
+
+ // Replaces @import commands with the actual stylesheet content.
+ // This happens recursively but omits external files.
+ $contents = preg_replace_callback('/@import\s*(?:url\(\s*)?[\'"]?(?![a-z]+:)([^\'"\()]+)[\'"]?\s*\)?\s*;/', '_drupal_load_stylesheet', $contents);
+ return $contents;
+}
+
+/**
+ * Loads stylesheets recursively and returns contents with corrected paths.
+ *
+ * This function is used for recursive loading of stylesheets and
+ * returns the stylesheet content with all url() paths corrected.
+ */
+function _drupal_load_stylesheet($matches) {
+ $filename = $matches[1];
+ // Load the imported stylesheet and replace @import commands in there as well.
+ $file = drupal_load_stylesheet($filename, NULL, FALSE);
+
+ // Determine the file's directory.
+ $directory = dirname($filename);
+ // If the file is in the current directory, make sure '.' doesn't appear in
+ // the url() path.
+ $directory = $directory == '.' ? '' : $directory .'/';
+
+ // Alter all internal url() paths. Leave external paths alone. We don't need
+ // to normalize absolute paths here (i.e. remove folder/... segments) because
+ // that will be done later.
+ return preg_replace('/url\(\s*([\'"]?)(?![a-z]+:|\/+)/i', 'url(\1'. $directory, $file);
+}
+
+/**
+ * Deletes old cached CSS files.
+ */
+function drupal_clear_css_cache() {
+ variable_del('drupal_css_cache_files');
+ file_scan_directory('public://css', '/.*/', array('callback' => 'drupal_delete_file_if_stale'));
+}
+
+/**
+ * Callback to delete files modified more than a set time ago.
+ */
+function drupal_delete_file_if_stale($uri) {
+ // Default stale file threshold is 30 days.
+ if (REQUEST_TIME - filemtime($uri) > variable_get('drupal_stale_file_threshold', 2592000)) {
+ file_unmanaged_delete($uri);
+ }
+}
+
+/**
+ * Prepares a string for use as a CSS identifier (element, class, or ID name).
+ *
+ * http://www.w3.org/TR/CSS21/syndata.html#characters shows the syntax for valid
+ * CSS identifiers (including element names, classes, and IDs in selectors.)
+ *
+ * @param $identifier
+ * The identifier to clean.
+ * @param $filter
+ * An array of string replacements to use on the identifier.
+ *
+ * @return
+ * The cleaned identifier.
+ */
+function drupal_clean_css_identifier($identifier, $filter = array(' ' => '-', '_' => '-', '/' => '-', '[' => '-', ']' => '')) {
+ // By default, we filter using Drupal's coding standards.
+ $identifier = strtr($identifier, $filter);
+
+ // Valid characters in a CSS identifier are:
+ // - the hyphen (U+002D)
+ // - a-z (U+0030 - U+0039)
+ // - A-Z (U+0041 - U+005A)
+ // - the underscore (U+005F)
+ // - 0-9 (U+0061 - U+007A)
+ // - ISO 10646 characters U+00A1 and higher
+ // We strip out any character not in the above list.
+ $identifier = preg_replace('/[^\x{002D}\x{0030}-\x{0039}\x{0041}-\x{005A}\x{005F}\x{0061}-\x{007A}\x{00A1}-\x{FFFF}]/u', '', $identifier);
+
+ return $identifier;
+}
+
+/**
+ * Prepares a string for use as a valid class name.
+ *
+ * Do not pass one string containing multiple classes as they will be
+ * incorrectly concatenated with dashes, i.e. "one two" will become "one-two".
+ *
+ * @param $class
+ * The class name to clean.
+ *
+ * @return
+ * The cleaned class name.
+ */
+function drupal_html_class($class) {
+ // The output of this function will never change, so this uses a normal
+ // static instead of drupal_static().
+ static $classes = array();
+
+ if (!isset($classes[$class])) {
+ $classes[$class] = drupal_clean_css_identifier(drupal_strtolower($class));
+ }
+ return $classes[$class];
+}
+
+/**
+ * Prepares a string for use as a valid HTML ID and guarantees uniqueness.
+ *
+ * This function ensures that each passed HTML ID value only exists once on the
+ * page. By tracking the already returned ids, this function enables forms,
+ * blocks, and other content to be output multiple times on the same page,
+ * without breaking (X)HTML validation.
+ *
+ * For already existing IDs, a counter is appended to the ID string. Therefore,
+ * JavaScript and CSS code should not rely on any value that was generated by
+ * this function and instead should rely on manually added CSS classes or
+ * similarly reliable constructs.
+ *
+ * Two consecutive hyphens separate the counter from the original ID. To manage
+ * uniqueness across multiple Ajax requests on the same page, Ajax requests
+ * POST an array of all IDs currently present on the page, which are used to
+ * prime this function's cache upon first invocation.
+ *
+ * To allow reverse-parsing of IDs submitted via Ajax, any multiple consecutive
+ * hyphens in the originally passed $id are replaced with a single hyphen.
+ *
+ * @param $id
+ * The ID to clean.
+ *
+ * @return
+ * The cleaned ID.
+ */
+function drupal_html_id($id) {
+ // If this is an Ajax request, then content returned by this page request will
+ // be merged with content already on the base page. The HTML IDs must be
+ // unique for the fully merged content. Therefore, initialize $seen_ids to
+ // take into account IDs that are already in use on the base page.
+ $seen_ids_init = &drupal_static(__FUNCTION__ . ':init');
+ if (!isset($seen_ids_init)) {
+ // Ideally, Drupal would provide an API to persist state information about
+ // prior page requests in the database, and we'd be able to add this
+ // function's $seen_ids static variable to that state information in order
+ // to have it properly initialized for this page request. However, no such
+ // page state API exists, so instead, ajax.js adds all of the in-use HTML
+ // IDs to the POST data of Ajax submissions. Direct use of $_POST is
+ // normally not recommended as it could open up security risks, but because
+ // the raw POST data is cast to a number before being returned by this
+ // function, this usage is safe.
+ if (empty($_POST['ajax_html_ids'])) {
+ $seen_ids_init = array();
+ }
+ else {
+ // This function ensures uniqueness by appending a counter to the base id
+ // requested by the calling function after the first occurrence of that
+ // requested id. $_POST['ajax_html_ids'] contains the ids as they were
+ // returned by this function, potentially with the appended counter, so
+ // we parse that to reconstruct the $seen_ids array.
+ if (isset($_POST['ajax_html_ids'][0]) && strpos($_POST['ajax_html_ids'][0], ',') === FALSE) {
+ $ajax_html_ids = $_POST['ajax_html_ids'];
+ }
+ else {
+ // jquery.form.js may send the server a comma-separated string as the
+ // first element of an array (see http://drupal.org/node/1575060), so
+ // we need to convert it to an array in that case.
+ $ajax_html_ids = explode(',', $_POST['ajax_html_ids'][0]);
+ }
+ foreach ($ajax_html_ids as $seen_id) {
+ // We rely on '--' being used solely for separating a base id from the
+ // counter, which this function ensures when returning an id.
+ $parts = explode('--', $seen_id, 2);
+ if (!empty($parts[1]) && is_numeric($parts[1])) {
+ list($seen_id, $i) = $parts;
+ }
+ else {
+ $i = 1;
+ }
+ if (!isset($seen_ids_init[$seen_id]) || ($i > $seen_ids_init[$seen_id])) {
+ $seen_ids_init[$seen_id] = $i;
+ }
+ }
+ }
+ }
+ $seen_ids = &drupal_static(__FUNCTION__, $seen_ids_init);
+
+ $id = strtr(drupal_strtolower($id), array(' ' => '-', '_' => '-', '[' => '-', ']' => ''));
+
+ // As defined in http://www.w3.org/TR/html4/types.html#type-name, HTML IDs can
+ // only contain letters, digits ([0-9]), hyphens ("-"), underscores ("_"),
+ // colons (":"), and periods ("."). We strip out any character not in that
+ // list. Note that the CSS spec doesn't allow colons or periods in identifiers
+ // (http://www.w3.org/TR/CSS21/syndata.html#characters), so we strip those two
+ // characters as well.
+ $id = preg_replace('/[^A-Za-z0-9\-_]/', '', $id);
+
+ // Removing multiple consecutive hyphens.
+ $id = preg_replace('/\-+/', '-', $id);
+ // Ensure IDs are unique by appending a counter after the first occurrence.
+ // The counter needs to be appended with a delimiter that does not exist in
+ // the base ID. Requiring a unique delimiter helps ensure that we really do
+ // return unique IDs and also helps us re-create the $seen_ids array during
+ // Ajax requests.
+ if (isset($seen_ids[$id])) {
+ $id = $id . '--' . ++$seen_ids[$id];
+ }
+ else {
+ $seen_ids[$id] = 1;
+ }
+
+ return $id;
+}
+
+/**
+ * Provides a standard HTML class name that identifies a page region.
+ *
+ * It is recommended that template preprocess functions apply this class to any
+ * page region that is output by the theme (Drupal core already handles this in
+ * the standard template preprocess implementation). Standardizing the class
+ * names in this way allows modules to implement certain features, such as
+ * drag-and-drop or dynamic Ajax loading, in a theme-independent way.
+ *
+ * @param $region
+ * The name of the page region (for example, 'page_top' or 'content').
+ *
+ * @return
+ * An HTML class that identifies the region (for example, 'region-page-top'
+ * or 'region-content').
+ *
+ * @see template_preprocess_region()
+ */
+function drupal_region_class($region) {
+ return drupal_html_class("region-$region");
+}
+
+/**
+ * Adds a JavaScript file, setting, or inline code to the page.
+ *
+ * The behavior of this function depends on the parameters it is called with.
+ * Generally, it handles the addition of JavaScript to the page, either as
+ * reference to an existing file or as inline code. The following actions can be
+ * performed using this function:
+ * - Add a file ('file'): Adds a reference to a JavaScript file to the page.
+ * - Add inline JavaScript code ('inline'): Executes a piece of JavaScript code
+ * on the current page by placing the code directly in the page (for example,
+ * to tell the user that a new message arrived, by opening a pop up, alert
+ * box, etc.). This should only be used for JavaScript that cannot be executed
+ * from a file. When adding inline code, make sure that you are not relying on
+ * $() being the jQuery function. Wrap your code in
+ * @code (function ($) {... })(jQuery); @endcode
+ * or use jQuery() instead of $().
+ * - Add external JavaScript ('external'): Allows the inclusion of external
+ * JavaScript files that are not hosted on the local server. Note that these
+ * external JavaScript references do not get aggregated when preprocessing is
+ * on.
+ * - Add settings ('setting'): Adds settings to Drupal's global storage of
+ * JavaScript settings. Per-page settings are required by some modules to
+ * function properly. All settings will be accessible at Drupal.settings.
+ *
+ * Examples:
+ * @code
+ * drupal_add_js('misc/collapse.js');
+ * drupal_add_js('misc/collapse.js', 'file');
+ * drupal_add_js('jQuery(document).ready(function () { alert("Hello!"); });', 'inline');
+ * drupal_add_js('jQuery(document).ready(function () { alert("Hello!"); });',
+ * array('type' => 'inline', 'scope' => 'footer', 'weight' => 5)
+ * );
+ * drupal_add_js('http://example.com/example.js', 'external');
+ * drupal_add_js(array('myModule' => array('key' => 'value')), 'setting');
+ * @endcode
+ *
+ * Calling drupal_static_reset('drupal_add_js') will clear all JavaScript added
+ * so far.
+ *
+ * If JavaScript aggregation is enabled, all JavaScript files added with
+ * $options['preprocess'] set to TRUE will be merged into one aggregate file.
+ * Preprocessed inline JavaScript will not be aggregated into this single file.
+ * Externally hosted JavaScripts are never aggregated.
+ *
+ * The reason for aggregating the files is outlined quite thoroughly here:
+ * http://www.die.net/musings/page_load_time/ "Load fewer external objects. Due
+ * to request overhead, one bigger file just loads faster than two smaller ones
+ * half its size."
+ *
+ * $options['preprocess'] should be only set to TRUE when a file is required for
+ * all typical visitors and most pages of a site. It is critical that all
+ * preprocessed files are added unconditionally on every page, even if the
+ * files are not needed on a page. This is normally done by calling
+ * drupal_add_js() in a hook_init() implementation.
+ *
+ * Non-preprocessed files should only be added to the page when they are
+ * actually needed.
+ *
+ * @param $data
+ * (optional) If given, the value depends on the $options parameter, or
+ * $options['type'] if $options is passed as an associative array:
+ * - 'file': Path to the file relative to base_path().
+ * - 'inline': The JavaScript code that should be placed in the given scope.
+ * - 'external': The absolute path to an external JavaScript file that is not
+ * hosted on the local server. These files will not be aggregated if
+ * JavaScript aggregation is enabled.
+ * - 'setting': An associative array with configuration options. The array is
+ * merged directly into Drupal.settings. All modules should wrap their
+ * actual configuration settings in another variable to prevent conflicts in
+ * the Drupal.settings namespace. Items added with a string key will replace
+ * existing settings with that key; items with numeric array keys will be
+ * added to the existing settings array.
+ * @param $options
+ * (optional) A string defining the type of JavaScript that is being added in
+ * the $data parameter ('file'/'setting'/'inline'/'external'), or an
+ * associative array. JavaScript settings should always pass the string
+ * 'setting' only. Other types can have the following elements in the array:
+ * - type: The type of JavaScript that is to be added to the page. Allowed
+ * values are 'file', 'inline', 'external' or 'setting'. Defaults
+ * to 'file'.
+ * - scope: The location in which you want to place the script. Possible
+ * values are 'header' or 'footer'. If your theme implements different
+ * regions, you can also use these. Defaults to 'header'.
+ * - group: A number identifying the group in which to add the JavaScript.
+ * Available constants are:
+ * - JS_LIBRARY: Any libraries, settings, or jQuery plugins.
+ * - JS_DEFAULT: Any module-layer JavaScript.
+ * - JS_THEME: Any theme-layer JavaScript.
+ * The group number serves as a weight: JavaScript within a lower weight
+ * group is presented on the page before JavaScript within a higher weight
+ * group.
+ * - every_page: For optimal front-end performance when aggregation is
+ * enabled, this should be set to TRUE if the JavaScript is present on every
+ * page of the website for users for whom it is present at all. This
+ * defaults to FALSE. It is set to TRUE for JavaScript files that are added
+ * via module and theme .info files. Modules that add JavaScript within
+ * hook_init() implementations, or from other code that ensures that the
+ * JavaScript is added to all website pages, should also set this flag to
+ * TRUE. All JavaScript files within the same group and that have the
+ * 'every_page' flag set to TRUE and do not have 'preprocess' set to FALSE
+ * are aggregated together into a single aggregate file, and that aggregate
+ * file can be reused across a user's entire site visit, leading to faster
+ * navigation between pages. However, JavaScript that is only needed on
+ * pages less frequently visited, can be added by code that only runs for
+ * those particular pages, and that code should not set the 'every_page'
+ * flag. This minimizes the size of the aggregate file that the user needs
+ * to download when first visiting the website. JavaScript without the
+ * 'every_page' flag is aggregated into a separate aggregate file. This
+ * other aggregate file is likely to change from page to page, and each new
+ * aggregate file needs to be downloaded when first encountered, so it
+ * should be kept relatively small by ensuring that most commonly needed
+ * JavaScript is added to every page.
+ * - weight: A number defining the order in which the JavaScript is added to
+ * the page relative to other JavaScript with the same 'scope', 'group',
+ * and 'every_page' value. In some cases, the order in which the JavaScript
+ * is presented on the page is very important. jQuery, for example, must be
+ * added to the page before any jQuery code is run, so jquery.js uses the
+ * JS_LIBRARY group and a weight of -20, jquery.once.js (a library drupal.js
+ * depends on) uses the JS_LIBRARY group and a weight of -19, drupal.js uses
+ * the JS_LIBRARY group and a weight of -1, other libraries use the
+ * JS_LIBRARY group and a weight of 0 or higher, and all other scripts use
+ * one of the other group constants. The exact ordering of JavaScript is as
+ * follows:
+ * - First by scope, with 'header' first, 'footer' last, and any other
+ * scopes provided by a custom theme coming in between, as determined by
+ * the theme.
+ * - Then by group.
+ * - Then by the 'every_page' flag, with TRUE coming before FALSE.
+ * - Then by weight.
+ * - Then by the order in which the JavaScript was added. For example, all
+ * else being the same, JavaScript added by a call to drupal_add_js() that
+ * happened later in the page request gets added to the page after one for
+ * which drupal_add_js() happened earlier in the page request.
+ * - defer: If set to TRUE, the defer attribute is set on the <script>
+ * tag. Defaults to FALSE.
+ * - cache: If set to FALSE, the JavaScript file is loaded anew on every page
+ * call; in other words, it is not cached. Used only when 'type' references
+ * a JavaScript file. Defaults to TRUE.
+ * - preprocess: If TRUE and JavaScript aggregation is enabled, the script
+ * file will be aggregated. Defaults to TRUE.
+ *
+ * @return
+ * The current array of JavaScript files, settings, and in-line code,
+ * including Drupal defaults, anything previously added with calls to
+ * drupal_add_js(), and this function call's additions.
+ *
+ * @see drupal_get_js()
+ */
+function drupal_add_js($data = NULL, $options = NULL) {
+ $javascript = &drupal_static(__FUNCTION__, array());
+
+ // Construct the options, taking the defaults into consideration.
+ if (isset($options)) {
+ if (!is_array($options)) {
+ $options = array('type' => $options);
+ }
+ }
+ else {
+ $options = array();
+ }
+ $options += drupal_js_defaults($data);
+
+ // Preprocess can only be set if caching is enabled.
+ $options['preprocess'] = $options['cache'] ? $options['preprocess'] : FALSE;
+
+ // Tweak the weight so that files of the same weight are included in the
+ // order of the calls to drupal_add_js().
+ $options['weight'] += count($javascript) / 1000;
+
+ if (isset($data)) {
+ // Add jquery.js and drupal.js, as well as the basePath setting, the
+ // first time a JavaScript file is added.
+ if (empty($javascript)) {
+ // url() generates the prefix using hook_url_outbound_alter(). Instead of
+ // running the hook_url_outbound_alter() again here, extract the prefix
+ // from url().
+ url('', array('prefix' => &$prefix));
+ $javascript = array(
+ 'settings' => array(
+ 'data' => array(
+ array('basePath' => base_path()),
+ array('pathPrefix' => empty($prefix) ? '' : $prefix),
+ ),
+ 'type' => 'setting',
+ 'scope' => 'header',
+ 'group' => JS_LIBRARY,
+ 'every_page' => TRUE,
+ 'weight' => 0,
+ ),
+ 'misc/drupal.js' => array(
+ 'data' => 'misc/drupal.js',
+ 'type' => 'file',
+ 'scope' => 'header',
+ 'group' => JS_LIBRARY,
+ 'every_page' => TRUE,
+ 'weight' => -1,
+ 'preprocess' => TRUE,
+ 'cache' => TRUE,
+ 'defer' => FALSE,
+ ),
+ );
+ // Register all required libraries.
+ drupal_add_library('system', 'jquery', TRUE);
+ drupal_add_library('system', 'jquery.once', TRUE);
+ }
+
+ switch ($options['type']) {
+ case 'setting':
+ // All JavaScript settings are placed in the header of the page with
+ // the library weight so that inline scripts appear afterwards.
+ $javascript['settings']['data'][] = $data;
+ break;
+
+ case 'inline':
+ $javascript[] = $options;
+ break;
+
+ default: // 'file' and 'external'
+ // Local and external files must keep their name as the associative key
+ // so the same JavaScript file is not added twice.
+ $javascript[$options['data']] = $options;
+ }
+ }
+ return $javascript;
+}
+
+/**
+ * Constructs an array of the defaults that are used for JavaScript items.
+ *
+ * @param $data
+ * (optional) The default data parameter for the JavaScript item array.
+ *
+ * @see drupal_get_js()
+ * @see drupal_add_js()
+ */
+function drupal_js_defaults($data = NULL) {
+ return array(
+ 'type' => 'file',
+ 'group' => JS_DEFAULT,
+ 'every_page' => FALSE,
+ 'weight' => 0,
+ 'scope' => 'header',
+ 'cache' => TRUE,
+ 'defer' => FALSE,
+ 'preprocess' => TRUE,
+ 'version' => NULL,
+ 'data' => $data,
+ );
+}
+
+/**
+ * Returns a themed presentation of all JavaScript code for the current page.
+ *
+ * References to JavaScript files are placed in a certain order: first, all
+ * 'core' files, then all 'module' and finally all 'theme' JavaScript files
+ * are added to the page. Then, all settings are output, followed by 'inline'
+ * JavaScript code. If running update.php, all preprocessing is disabled.
+ *
+ * Note that hook_js_alter(&$javascript) is called during this function call
+ * to allow alterations of the JavaScript during its presentation. Calls to
+ * drupal_add_js() from hook_js_alter() will not be added to the output
+ * presentation. The correct way to add JavaScript during hook_js_alter()
+ * is to add another element to the $javascript array, deriving from
+ * drupal_js_defaults(). See locale_js_alter() for an example of this.
+ *
+ * @param $scope
+ * (optional) The scope for which the JavaScript rules should be returned.
+ * Defaults to 'header'.
+ * @param $javascript
+ * (optional) An array with all JavaScript code. Defaults to the default
+ * JavaScript array for the given scope.
+ * @param $skip_alter
+ * (optional) If set to TRUE, this function skips calling drupal_alter() on
+ * $javascript, useful when the calling function passes a $javascript array
+ * that has already been altered.
+ *
+ * @return
+ * All JavaScript code segments and includes for the scope as HTML tags.
+ *
+ * @see drupal_add_js()
+ * @see locale_js_alter()
+ * @see drupal_js_defaults()
+ */
+function drupal_get_js($scope = 'header', $javascript = NULL, $skip_alter = FALSE) {
+ if (!isset($javascript)) {
+ $javascript = drupal_add_js();
+ }
+ if (empty($javascript)) {
+ return '';
+ }
+
+ // Allow modules to alter the JavaScript.
+ if (!$skip_alter) {
+ drupal_alter('js', $javascript);
+ }
+
+ // Filter out elements of the given scope.
+ $items = array();
+ foreach ($javascript as $key => $item) {
+ if ($item['scope'] == $scope) {
+ $items[$key] = $item;
+ }
+ }
+
+ $output = '';
+ // The index counter is used to keep aggregated and non-aggregated files in
+ // order by weight.
+ $index = 1;
+ $processed = array();
+ $files = array();
+ $preprocess_js = (variable_get('preprocess_js', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
+
+ // A dummy query-string is added to filenames, to gain control over
+ // browser-caching. The string changes on every update or full cache
+ // flush, forcing browsers to load a new copy of the files, as the
+ // URL changed. Files that should not be cached (see drupal_add_js())
+ // get REQUEST_TIME as query-string instead, to enforce reload on every
+ // page request.
+ $default_query_string = variable_get('css_js_query_string', '0');
+
+ // For inline JavaScript to validate as XHTML, all JavaScript containing
+ // XHTML needs to be wrapped in CDATA. To make that backwards compatible
+ // with HTML 4, we need to comment out the CDATA-tag.
+ $embed_prefix = "\n<!--//--><![CDATA[//><!--\n";
+ $embed_suffix = "\n//--><!]]>\n";
+
+ // Since JavaScript may look for arguments in the URL and act on them, some
+ // third-party code might require the use of a different query string.
+ $js_version_string = variable_get('drupal_js_version_query_string', 'v=');
+
+ // Sort the JavaScript so that it appears in the correct order.
+ uasort($items, 'drupal_sort_css_js');
+
+ // Provide the page with information about the individual JavaScript files
+ // used, information not otherwise available when aggregation is enabled.
+ $setting['ajaxPageState']['js'] = array_fill_keys(array_keys($items), 1);
+ unset($setting['ajaxPageState']['js']['settings']);
+ drupal_add_js($setting, 'setting');
+
+ // If we're outputting the header scope, then this might be the final time
+ // that drupal_get_js() is running, so add the setting to this output as well
+ // as to the drupal_add_js() cache. If $items['settings'] doesn't exist, it's
+ // because drupal_get_js() was intentionally passed a $javascript argument
+ // stripped off settings, potentially in order to override how settings get
+ // output, so in this case, do not add the setting to this output.
+ if ($scope == 'header' && isset($items['settings'])) {
+ $items['settings']['data'][] = $setting;
+ }
+
+ // Loop through the JavaScript to construct the rendered output.
+ $element = array(
+ '#tag' => 'script',
+ '#value' => '',
+ '#attributes' => array(
+ 'type' => 'text/javascript',
+ ),
+ );
+ foreach ($items as $item) {
+ $query_string = empty($item['version']) ? $default_query_string : $js_version_string . $item['version'];
+
+ switch ($item['type']) {
+ case 'setting':
+ $js_element = $element;
+ $js_element['#value_prefix'] = $embed_prefix;
+ $js_element['#value'] = 'jQuery.extend(Drupal.settings, ' . drupal_json_encode(drupal_array_merge_deep_array($item['data'])) . ");";
+ $js_element['#value_suffix'] = $embed_suffix;
+ $output .= theme('html_tag', array('element' => $js_element));
+ break;
+
+ case 'inline':
+ $js_element = $element;
+ if ($item['defer']) {
+ $js_element['#attributes']['defer'] = 'defer';
+ }
+ $js_element['#value_prefix'] = $embed_prefix;
+ $js_element['#value'] = $item['data'];
+ $js_element['#value_suffix'] = $embed_suffix;
+ $processed[$index++] = theme('html_tag', array('element' => $js_element));
+ break;
+
+ case 'file':
+ $js_element = $element;
+ if (!$item['preprocess'] || !$preprocess_js) {
+ if ($item['defer']) {
+ $js_element['#attributes']['defer'] = 'defer';
+ }
+ $query_string_separator = (strpos($item['data'], '?') !== FALSE) ? '&' : '?';
+ $js_element['#attributes']['src'] = file_create_url($item['data']) . $query_string_separator . ($item['cache'] ? $query_string : REQUEST_TIME);
+ $processed[$index++] = theme('html_tag', array('element' => $js_element));
+ }
+ else {
+ // By increasing the index for each aggregated file, we maintain
+ // the relative ordering of JS by weight. We also set the key such
+ // that groups are split by items sharing the same 'group' value and
+ // 'every_page' flag. While this potentially results in more aggregate
+ // files, it helps make each one more reusable across a site visit,
+ // leading to better front-end performance of a website as a whole.
+ // See drupal_add_js() for details.
+ $key = 'aggregate_' . $item['group'] . '_' . $item['every_page'] . '_' . $index;
+ $processed[$key] = '';
+ $files[$key][$item['data']] = $item;
+ }
+ break;
+
+ case 'external':
+ $js_element = $element;
+ // Preprocessing for external JavaScript files is ignored.
+ if ($item['defer']) {
+ $js_element['#attributes']['defer'] = 'defer';
+ }
+ $js_element['#attributes']['src'] = $item['data'];
+ $processed[$index++] = theme('html_tag', array('element' => $js_element));
+ break;
+ }
+ }
+
+ // Aggregate any remaining JS files that haven't already been output.
+ if ($preprocess_js && count($files) > 0) {
+ foreach ($files as $key => $file_set) {
+ $uri = drupal_build_js_cache($file_set);
+ // Only include the file if was written successfully. Errors are logged
+ // using watchdog.
+ if ($uri) {
+ $preprocess_file = file_create_url($uri);
+ $js_element = $element;
+ $js_element['#attributes']['src'] = $preprocess_file;
+ $processed[$key] = theme('html_tag', array('element' => $js_element));
+ }
+ }
+ }
+
+ // Keep the order of JS files consistent as some are preprocessed and others are not.
+ // Make sure any inline or JS setting variables appear last after libraries have loaded.
+ return implode('', $processed) . $output;
+}
+
+/**
+ * Adds attachments to a render() structure.
+ *
+ * Libraries, JavaScript, CSS and other types of custom structures are attached
+ * to elements using the #attached property. The #attached property is an
+ * associative array, where the keys are the the attachment types and the values
+ * are the attached data. For example:
+ * @code
+ * $build['#attached'] = array(
+ * 'js' => array(drupal_get_path('module', 'taxonomy') . '/taxonomy.js'),
+ * 'css' => array(drupal_get_path('module', 'taxonomy') . '/taxonomy.css'),
+ * );
+ * @endcode
+ *
+ * 'js', 'css', and 'library' are types that get special handling. For any
+ * other kind of attached data, the array key must be the full name of the
+ * callback function and each value an array of arguments. For example:
+ * @code
+ * $build['#attached']['drupal_add_http_header'] = array(
+ * array('Content-Type', 'application/rss+xml; charset=utf-8'),
+ * );
+ * @endcode
+ *
+ * External 'js' and 'css' files can also be loaded. For example:
+ * @code
+ * $build['#attached']['js'] = array(
+ * 'http://code.jquery.com/jquery-1.4.2.min.js' => array(
+ * 'type' => 'external',
+ * ),
+ * );
+ * @endcode
+ *
+ * @param $elements
+ * The structured array describing the data being rendered.
+ * @param $group
+ * The default group of JavaScript and CSS being added. This is only applied
+ * to the stylesheets and JavaScript items that don't have an explicit group
+ * assigned to them.
+ * @param $dependency_check
+ * When TRUE, will exit if a given library's dependencies are missing. When
+ * set to FALSE, will continue to add the libraries, even though one or more
+ * dependencies are missing. Defaults to FALSE.
+ * @param $every_page
+ * Set to TRUE to indicate that the attachments are added to every page on the
+ * site. Only attachments with the every_page flag set to TRUE can participate
+ * in JavaScript/CSS aggregation.
+ *
+ * @return
+ * FALSE if there were any missing library dependencies; TRUE if all library
+ * dependencies were met.
+ *
+ * @see drupal_add_library()
+ * @see drupal_add_js()
+ * @see drupal_add_css()
+ * @see drupal_render()
+ */
+function drupal_process_attached($elements, $group = JS_DEFAULT, $dependency_check = FALSE, $every_page = NULL) {
+ // Add defaults to the special attached structures that should be processed differently.
+ $elements['#attached'] += array(
+ 'library' => array(),
+ 'js' => array(),
+ 'css' => array(),
+ );
+
+ // Add the libraries first.
+ $success = TRUE;
+ foreach ($elements['#attached']['library'] as $library) {
+ if (drupal_add_library($library[0], $library[1], $every_page) === FALSE) {
+ $success = FALSE;
+ // Exit if the dependency is missing.
+ if ($dependency_check) {
+ return $success;
+ }
+ }
+ }
+ unset($elements['#attached']['library']);
+
+ // Add both the JavaScript and the CSS.
+ // The parameters for drupal_add_js() and drupal_add_css() require special
+ // handling.
+ foreach (array('js', 'css') as $type) {
+ foreach ($elements['#attached'][$type] as $data => $options) {
+ // If the value is not an array, it's a filename and passed as first
+ // (and only) argument.
+ if (!is_array($options)) {
+ $data = $options;
+ $options = NULL;
+ }
+ // In some cases, the first parameter ($data) is an array. Arrays can't be
+ // passed as keys in PHP, so we have to get $data from the value array.
+ if (is_numeric($data)) {
+ $data = $options['data'];
+ unset($options['data']);
+ }
+ // Apply the default group if it isn't explicitly given.
+ if (!isset($options['group'])) {
+ $options['group'] = $group;
+ }
+ // Set the every_page flag if one was passed.
+ if (isset($every_page)) {
+ $options['every_page'] = $every_page;
+ }
+ call_user_func('drupal_add_' . $type, $data, $options);
+ }
+ unset($elements['#attached'][$type]);
+ }
+
+ // Add additional types of attachments specified in the render() structure.
+ // Libraries, JavaScript and CSS have been added already, as they require
+ // special handling.
+ foreach ($elements['#attached'] as $callback => $options) {
+ if (function_exists($callback)) {
+ foreach ($elements['#attached'][$callback] as $args) {
+ call_user_func_array($callback, $args);
+ }
+ }
+ }
+
+ return $success;
+}
+
+/**
+ * Adds JavaScript to change the state of an element based on another element.
+ *
+ * A "state" means a certain property on a DOM element, such as "visible" or
+ * "checked". A state can be applied to an element, depending on the state of
+ * another element on the page. In general, states depend on HTML attributes and
+ * DOM element properties, which change due to user interaction.
+ *
+ * Since states are driven by JavaScript only, it is important to understand
+ * that all states are applied on presentation only, none of the states force
+ * any server-side logic, and that they will not be applied for site visitors
+ * without JavaScript support. All modules implementing states have to make
+ * sure that the intended logic also works without JavaScript being enabled.
+ *
+ * #states is an associative array in the form of:
+ * @code
+ * array(
+ * STATE1 => CONDITIONS_ARRAY1,
+ * STATE2 => CONDITIONS_ARRAY2,
+ * ...
+ * )
+ * @endcode
+ * Each key is the name of a state to apply to the element, such as 'visible'.
+ * Each value is a list of conditions that denote when the state should be
+ * applied.
+ *
+ * Multiple different states may be specified to act on complex conditions:
+ * @code
+ * array(
+ * 'visible' => CONDITIONS,
+ * 'checked' => OTHER_CONDITIONS,
+ * )
+ * @endcode
+ *
+ * Every condition is a key/value pair, whose key is a jQuery selector that
+ * denotes another element on the page, and whose value is an array of
+ * conditions, which must bet met on that element:
+ * @code
+ * array(
+ * 'visible' => array(
+ * JQUERY_SELECTOR => REMOTE_CONDITIONS,
+ * JQUERY_SELECTOR => REMOTE_CONDITIONS,
+ * ...
+ * ),
+ * )
+ * @endcode
+ * All conditions must be met for the state to be applied.
+ *
+ * Each remote condition is a key/value pair specifying conditions on the other
+ * element that need to be met to apply the state to the element:
+ * @code
+ * array(
+ * 'visible' => array(
+ * ':input[name="remote_checkbox"]' => array('checked' => TRUE),
+ * ),
+ * )
+ * @endcode
+ *
+ * For example, to show a textfield only when a checkbox is checked:
+ * @code
+ * $form['toggle_me'] = array(
+ * '#type' => 'checkbox',
+ * '#title' => t('Tick this box to type'),
+ * );
+ * $form['settings'] = array(
+ * '#type' => 'textfield',
+ * '#states' => array(
+ * // Only show this field when the 'toggle_me' checkbox is enabled.
+ * 'visible' => array(
+ * ':input[name="toggle_me"]' => array('checked' => TRUE),
+ * ),
+ * ),
+ * );
+ * @endcode
+ *
+ * The following states may be applied to an element:
+ * - enabled
+ * - disabled
+ * - required
+ * - optional
+ * - visible
+ * - invisible
+ * - checked
+ * - unchecked
+ * - expanded
+ * - collapsed
+ *
+ * The following states may be used in remote conditions:
+ * - empty
+ * - filled
+ * - checked
+ * - unchecked
+ * - expanded
+ * - collapsed
+ * - value
+ *
+ * The following states exist for both elements and remote conditions, but are
+ * not fully implemented and may not change anything on the element:
+ * - relevant
+ * - irrelevant
+ * - valid
+ * - invalid
+ * - touched
+ * - untouched
+ * - readwrite
+ * - readonly
+ *
+ * When referencing select lists and radio buttons in remote conditions, a
+ * 'value' condition must be used:
+ * @code
+ * '#states' => array(
+ * // Show the settings if 'bar' has been selected for 'foo'.
+ * 'visible' => array(
+ * ':input[name="foo"]' => array('value' => 'bar'),
+ * ),
+ * ),
+ * @endcode
+ *
+ * @param $elements
+ * A renderable array element having a #states property as described above.
+ *
+ * @see form_example_states_form()
+ */
+function drupal_process_states(&$elements) {
+ $elements['#attached']['library'][] = array('system', 'drupal.states');
+ $elements['#attached']['js'][] = array(
+ 'type' => 'setting',
+ 'data' => array('states' => array('#' . $elements['#id'] => $elements['#states'])),
+ );
+}
+
+/**
+ * Adds multiple JavaScript or CSS files at the same time.
+ *
+ * A library defines a set of JavaScript and/or CSS files, optionally using
+ * settings, and optionally requiring another library. For example, a library
+ * can be a jQuery plugin, a JavaScript framework, or a CSS framework. This
+ * function allows modules to load a library defined/shipped by itself or a
+ * depending module, without having to add all files of the library separately.
+ * Each library is only loaded once.
+ *
+ * @param $module
+ * The name of the module that registered the library.
+ * @param $name
+ * The name of the library to add.
+ * @param $every_page
+ * Set to TRUE if this library is added to every page on the site. Only items
+ * with the every_page flag set to TRUE can participate in aggregation.
+ *
+ * @return
+ * TRUE if the library was successfully added; FALSE if the library or one of
+ * its dependencies could not be added.
+ *
+ * @see drupal_get_library()
+ * @see hook_library()
+ * @see hook_library_alter()
+ */
+function drupal_add_library($module, $name, $every_page = NULL) {
+ $added = &drupal_static(__FUNCTION__, array());
+
+ // Only process the library if it exists and it was not added already.
+ if (!isset($added[$module][$name])) {
+ if ($library = drupal_get_library($module, $name)) {
+ // Add all components within the library.
+ $elements['#attached'] = array(
+ 'library' => $library['dependencies'],
+ 'js' => $library['js'],
+ 'css' => $library['css'],
+ );
+ $added[$module][$name] = drupal_process_attached($elements, JS_LIBRARY, TRUE, $every_page);
+ }
+ else {
+ // Requested library does not exist.
+ $added[$module][$name] = FALSE;
+ }
+ }
+
+ return $added[$module][$name];
+}
+
+/**
+ * Retrieves information for a JavaScript/CSS library.
+ *
+ * Library information is statically cached. Libraries are keyed by module for
+ * several reasons:
+ * - Libraries are not unique. Multiple modules might ship with the same library
+ * in a different version or variant. This registry cannot (and does not
+ * attempt to) prevent library conflicts.
+ * - Modules implementing and thereby depending on a library that is registered
+ * by another module can only rely on that module's library.
+ * - Two (or more) modules can still register the same library and use it
+ * without conflicts in case the libraries are loaded on certain pages only.
+ *
+ * @param $module
+ * The name of a module that registered a library.
+ * @param $name
+ * (optional) The name of a registered library to retrieve. By default, all
+ * libraries registered by $module are returned.
+ *
+ * @return
+ * The definition of the requested library, if $name was passed and it exists,
+ * or FALSE if it does not exist. If no $name was passed, an associative array
+ * of libraries registered by $module is returned (which may be empty).
+ *
+ * @see drupal_add_library()
+ * @see hook_library()
+ * @see hook_library_alter()
+ *
+ * @todo The purpose of drupal_get_*() is completely different to other page
+ * requisite API functions; find and use a different name.
+ */
+function drupal_get_library($module, $name = NULL) {
+ $libraries = &drupal_static(__FUNCTION__, array());
+
+ if (!isset($libraries[$module])) {
+ // Retrieve all libraries associated with the module.
+ $module_libraries = module_invoke($module, 'library');
+ if (empty($module_libraries)) {
+ $module_libraries = array();
+ }
+ // Allow modules to alter the module's registered libraries.
+ drupal_alter('library', $module_libraries, $module);
+
+ foreach ($module_libraries as $key => $data) {
+ if (is_array($data)) {
+ // Add default elements to allow for easier processing.
+ $module_libraries[$key] += array('dependencies' => array(), 'js' => array(), 'css' => array());
+ foreach ($module_libraries[$key]['js'] as $file => $options) {
+ $module_libraries[$key]['js'][$file]['version'] = $module_libraries[$key]['version'];
+ }
+ }
+ }
+ $libraries[$module] = $module_libraries;
+ }
+ if (isset($name)) {
+ if (!isset($libraries[$module][$name])) {
+ $libraries[$module][$name] = FALSE;
+ }
+ return $libraries[$module][$name];
+ }
+ return $libraries[$module];
+}
+
+/**
+ * Assists in adding the tableDrag JavaScript behavior to a themed table.
+ *
+ * Draggable tables should be used wherever an outline or list of sortable items
+ * needs to be arranged by an end-user. Draggable tables are very flexible and
+ * can manipulate the value of form elements placed within individual columns.
+ *
+ * To set up a table to use drag and drop in place of weight select-lists or in
+ * place of a form that contains parent relationships, the form must be themed
+ * into a table. The table must have an ID attribute set. If using
+ * theme_table(), the ID may be set as follows:
+ * @code
+ * $output = theme('table', array('header' => $header, 'rows' => $rows, 'attributes' => array('id' => 'my-module-table')));
+ * return $output;
+ * @endcode
+ *
+ * In the theme function for the form, a special class must be added to each
+ * form element within the same column, "grouping" them together.
+ *
+ * In a situation where a single weight column is being sorted in the table, the
+ * classes could be added like this (in the theme function):
+ * @code
+ * $form['my_elements'][$delta]['weight']['#attributes']['class'] = array('my-elements-weight');
+ * @endcode
+ *
+ * Each row of the table must also have a class of "draggable" in order to
+ * enable the drag handles:
+ * @code
+ * $row = array(...);
+ * $rows[] = array(
+ * 'data' => $row,
+ * 'class' => array('draggable'),
+ * );
+ * @endcode
+ *
+ * When tree relationships are present, the two additional classes
+ * 'tabledrag-leaf' and 'tabledrag-root' can be used to refine the behavior:
+ * - Rows with the 'tabledrag-leaf' class cannot have child rows.
+ * - Rows with the 'tabledrag-root' class cannot be nested under a parent row.
+ *
+ * Calling drupal_add_tabledrag() would then be written as such:
+ * @code
+ * drupal_add_tabledrag('my-module-table', 'order', 'sibling', 'my-elements-weight');
+ * @endcode
+ *
+ * In a more complex case where there are several groups in one column (such as
+ * the block regions on the admin/structure/block page), a separate subgroup
+ * class must also be added to differentiate the groups.
+ * @code
+ * $form['my_elements'][$region][$delta]['weight']['#attributes']['class'] = array('my-elements-weight', 'my-elements-weight-' . $region);
+ * @endcode
+ *
+ * $group is still 'my-element-weight', and the additional $subgroup variable
+ * will be passed in as 'my-elements-weight-' . $region. This also means that
+ * you'll need to call drupal_add_tabledrag() once for every region added.
+ *
+ * @code
+ * foreach ($regions as $region) {
+ * drupal_add_tabledrag('my-module-table', 'order', 'sibling', 'my-elements-weight', 'my-elements-weight-' . $region);
+ * }
+ * @endcode
+ *
+ * In a situation where tree relationships are present, adding multiple
+ * subgroups is not necessary, because the table will contain indentations that
+ * provide enough information about the sibling and parent relationships. See
+ * theme_menu_overview_form() for an example creating a table containing parent
+ * relationships.
+ *
+ * Note that this function should be called from the theme layer, such as in a
+ * .tpl.php file, theme_ function, or in a template_preprocess function, not in
+ * a form declaration. Though the same JavaScript could be added to the page
+ * using drupal_add_js() directly, this function helps keep template files
+ * clean and readable. It also prevents tabledrag.js from being added twice
+ * accidentally.
+ *
+ * @param $table_id
+ * String containing the target table's id attribute. If the table does not
+ * have an id, one will need to be set, such as <table id="my-module-table">.
+ * @param $action
+ * String describing the action to be done on the form item. Either 'match'
+ * 'depth', or 'order'. Match is typically used for parent relationships.
+ * Order is typically used to set weights on other form elements with the same
+ * group. Depth updates the target element with the current indentation.
+ * @param $relationship
+ * String describing where the $action variable should be performed. Either
+ * 'parent', 'sibling', 'group', or 'self'. Parent will only look for fields
+ * up the tree. Sibling will look for fields in the same group in rows above
+ * and below it. Self affects the dragged row itself. Group affects the
+ * dragged row, plus any children below it (the entire dragged group).
+ * @param $group
+ * A class name applied on all related form elements for this action.
+ * @param $subgroup
+ * (optional) If the group has several subgroups within it, this string should
+ * contain the class name identifying fields in the same subgroup.
+ * @param $source
+ * (optional) If the $action is 'match', this string should contain the class
+ * name identifying what field will be used as the source value when matching
+ * the value in $subgroup.
+ * @param $hidden
+ * (optional) The column containing the field elements may be entirely hidden
+ * from view dynamically when the JavaScript is loaded. Set to FALSE if the
+ * column should not be hidden.
+ * @param $limit
+ * (optional) Limit the maximum amount of parenting in this table.
+ * @see block-admin-display-form.tpl.php
+ * @see theme_menu_overview_form()
+ */
+function drupal_add_tabledrag($table_id, $action, $relationship, $group, $subgroup = NULL, $source = NULL, $hidden = TRUE, $limit = 0) {
+ $js_added = &drupal_static(__FUNCTION__, FALSE);
+ if (!$js_added) {
+ // Add the table drag JavaScript to the page before the module JavaScript
+ // to ensure that table drag behaviors are registered before any module
+ // uses it.
+ drupal_add_library('system', 'jquery.cookie');
+ drupal_add_js('misc/tabledrag.js', array('weight' => -1));
+ $js_added = TRUE;
+ }
+
+ // If a subgroup or source isn't set, assume it is the same as the group.
+ $target = isset($subgroup) ? $subgroup : $group;
+ $source = isset($source) ? $source : $target;
+ $settings['tableDrag'][$table_id][$group][] = array(
+ 'target' => $target,
+ 'source' => $source,
+ 'relationship' => $relationship,
+ 'action' => $action,
+ 'hidden' => $hidden,
+ 'limit' => $limit,
+ );
+ drupal_add_js($settings, 'setting');
+}
+
+/**
+ * Aggregates JavaScript files into a cache file in the files directory.
+ *
+ * The file name for the JavaScript cache file is generated from the hash of
+ * the aggregated contents of the files in $files. This forces proxies and
+ * browsers to download new JavaScript when the JavaScript changes.
+ *
+ * The cache file name is retrieved on a page load via a lookup variable that
+ * contains an associative array. The array key is the hash of the names in
+ * $files while the value is the cache file name. The cache file is generated
+ * in two cases. First, if there is no file name value for the key, which will
+ * happen if a new file name has been added to $files or after the lookup
+ * variable is emptied to force a rebuild of the cache. Second, the cache file
+ * is generated if it is missing on disk. Old cache files are not deleted
+ * immediately when the lookup variable is emptied, but are deleted after a set
+ * period by drupal_delete_file_if_stale(). This ensures that files referenced
+ * by a cached page will still be available.
+ *
+ * @param $files
+ * An array of JavaScript files to aggregate and compress into one file.
+ *
+ * @return
+ * The URI of the cache file, or FALSE if the file could not be saved.
+ */
+function drupal_build_js_cache($files) {
+ $contents = '';
+ $uri = '';
+ $map = variable_get('drupal_js_cache_files', array());
+ // Create a new array so that only the file names are used to create the hash.
+ // This prevents new aggregates from being created unnecessarily.
+ $js_data = array();
+ foreach ($files as $file) {
+ $js_data[] = $file['data'];
+ }
+ $key = hash('sha256', serialize($js_data));
+ if (isset($map[$key])) {
+ $uri = $map[$key];
+ }
+
+ if (empty($uri) || !file_exists($uri)) {
+ // Build aggregate JS file.
+ foreach ($files as $path => $info) {
+ if ($info['preprocess']) {
+ // Append a ';' and a newline after each JS file to prevent them from running together.
+ $contents .= file_get_contents($path) . ";\n";
+ }
+ }
+ // Prefix filename to prevent blocking by firewalls which reject files
+ // starting with "ad*".
+ $filename = 'js_' . drupal_hash_base64($contents) . '.js';
+ // Create the js/ within the files folder.
+ $jspath = 'public://js';
+ $uri = $jspath . '/' . $filename;
+ // Create the JS file.
+ file_prepare_directory($jspath, FILE_CREATE_DIRECTORY);
+ if (!file_exists($uri) && !file_unmanaged_save_data($contents, $uri, FILE_EXISTS_REPLACE)) {
+ return FALSE;
+ }
+ // If JS gzip compression is enabled, clean URLs are enabled (which means
+ // that rewrite rules are working) and the zlib extension is available then
+ // create a gzipped version of this file. This file is served conditionally
+ // to browsers that accept gzip using .htaccess rules.
+ if (variable_get('js_gzip_compression', TRUE) && variable_get('clean_url', 0) && extension_loaded('zlib')) {
+ if (!file_exists($uri . '.gz') && !file_unmanaged_save_data(gzencode($contents, 9, FORCE_GZIP), $uri . '.gz', FILE_EXISTS_REPLACE)) {
+ return FALSE;
+ }
+ }
+ $map[$key] = $uri;
+ variable_set('drupal_js_cache_files', $map);
+ }
+ return $uri;
+}
+
+/**
+ * Deletes old cached JavaScript files and variables.
+ */
+function drupal_clear_js_cache() {
+ variable_del('javascript_parsed');
+ variable_del('drupal_js_cache_files');
+ file_scan_directory('public://js', '/.*/', array('callback' => 'drupal_delete_file_if_stale'));
+}
+
+/**
+ * Converts a PHP variable into its JavaScript equivalent.
+ *
+ * We use HTML-safe strings, with several characters escaped.
+ *
+ * @see drupal_json_decode()
+ * @see drupal_json_encode_helper()
+ * @ingroup php_wrappers
+ */
+function drupal_json_encode($var) {
+ // The PHP version cannot change within a request.
+ static $php530;
+
+ if (!isset($php530)) {
+ $php530 = version_compare(PHP_VERSION, '5.3.0', '>=');
+ }
+
+ if ($php530) {
+ // Encode <, >, ', &, and " using the json_encode() options parameter.
+ return json_encode($var, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT);
+ }
+
+ // json_encode() escapes <, >, ', &, and " using its options parameter, but
+ // does not support this parameter prior to PHP 5.3.0. Use a helper instead.
+ include_once DRUPAL_ROOT . '/includes/json-encode.inc';
+ return drupal_json_encode_helper($var);
+}
+
+/**
+ * Converts an HTML-safe JSON string into its PHP equivalent.
+ *
+ * @see drupal_json_encode()
+ * @ingroup php_wrappers
+ */
+function drupal_json_decode($var) {
+ return json_decode($var, TRUE);
+}
+
+/**
+ * Returns data in JSON format.
+ *
+ * This function should be used for JavaScript callback functions returning
+ * data in JSON format. It sets the header for JavaScript output.
+ *
+ * @param $var
+ * (optional) If set, the variable will be converted to JSON and output.
+ */
+function drupal_json_output($var = NULL) {
+ // We are returning JSON, so tell the browser.
+ drupal_add_http_header('Content-Type', 'application/json');
+
+ if (isset($var)) {
+ echo drupal_json_encode($var);
+ }
+}
+
+/**
+ * Ensures the private key variable used to generate tokens is set.
+ *
+ * @return
+ * The private key.
+ */
+function drupal_get_private_key() {
+ if (!($key = variable_get('drupal_private_key', 0))) {
+ $key = drupal_random_key();
+ variable_set('drupal_private_key', $key);
+ }
+ return $key;
+}
+
+/**
+ * Generates a token based on $value, the user session, and the private key.
+ *
+ * @param $value
+ * An additional value to base the token on.
+ *
+ * @return string
+ * A 43-character URL-safe token for validation, based on the user session ID,
+ * the hash salt provided from drupal_get_hash_salt(), and the
+ * 'drupal_private_key' configuration variable.
+ *
+ * @see drupal_get_hash_salt()
+ */
+function drupal_get_token($value = '') {
+ return drupal_hmac_base64($value, session_id() . drupal_get_private_key() . drupal_get_hash_salt());
+}
+
+/**
+ * Validates a token based on $value, the user session, and the private key.
+ *
+ * @param $token
+ * The token to be validated.
+ * @param $value
+ * An additional value to base the token on.
+ * @param $skip_anonymous
+ * Set to true to skip token validation for anonymous users.
+ *
+ * @return
+ * True for a valid token, false for an invalid token. When $skip_anonymous
+ * is true, the return value will always be true for anonymous users.
+ */
+function drupal_valid_token($token, $value = '', $skip_anonymous = FALSE) {
+ global $user;
+ return (($skip_anonymous && $user->uid == 0) || ($token === drupal_get_token($value)));
+}
+
+function _drupal_bootstrap_full() {
+ static $called = FALSE;
+
+ if ($called) {
+ return;
+ }
+ $called = TRUE;
+ require_once DRUPAL_ROOT . '/' . variable_get('path_inc', 'includes/path.inc');
+ require_once DRUPAL_ROOT . '/includes/theme.inc';
+ require_once DRUPAL_ROOT . '/includes/pager.inc';
+ require_once DRUPAL_ROOT . '/' . variable_get('menu_inc', 'includes/menu.inc');
+ require_once DRUPAL_ROOT . '/includes/tablesort.inc';
+ require_once DRUPAL_ROOT . '/includes/file.inc';
+ require_once DRUPAL_ROOT . '/includes/unicode.inc';
+ require_once DRUPAL_ROOT . '/includes/image.inc';
+ require_once DRUPAL_ROOT . '/includes/form.inc';
+ require_once DRUPAL_ROOT . '/includes/mail.inc';
+ require_once DRUPAL_ROOT . '/includes/actions.inc';
+ require_once DRUPAL_ROOT . '/includes/ajax.inc';
+ require_once DRUPAL_ROOT . '/includes/token.inc';
+ require_once DRUPAL_ROOT . '/includes/errors.inc';
+
+ // Detect string handling method
+ unicode_check();
+ // Undo magic quotes
+ fix_gpc_magic();
+ // Load all enabled modules
+ module_load_all();
+ // Make sure all stream wrappers are registered.
+ file_get_stream_wrappers();
+ // Ensure mt_rand is reseeded, to prevent random values from one page load
+ // being exploited to predict random values in subsequent page loads.
+ $seed = unpack("L", drupal_random_bytes(4));
+ mt_srand($seed[1]);
+
+ $test_info = &$GLOBALS['drupal_test_info'];
+ if (!empty($test_info['in_child_site'])) {
+ // Running inside the simpletest child site, log fatal errors to test
+ // specific file directory.
+ ini_set('log_errors', 1);
+ ini_set('error_log', 'public://error.log');
+ }
+
+ // Initialize $_GET['q'] prior to invoking hook_init().
+ drupal_path_initialize();
+
+ // Let all modules take action before the menu system handles the request.
+ // We do not want this while running update.php.
+ if (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') {
+ // Prior to invoking hook_init(), initialize the theme (potentially a custom
+ // one for this page), so that:
+ // - Modules with hook_init() implementations that call theme() or
+ // theme_get_registry() don't initialize the incorrect theme.
+ // - The theme can have hook_*_alter() implementations affect page building
+ // (e.g., hook_form_alter(), hook_node_view_alter(), hook_page_alter()),
+ // ahead of when rendering starts.
+ menu_set_custom_theme();
+ drupal_theme_initialize();
+ module_invoke_all('init');
+ }
+}
+
+/**
+ * Stores the current page in the cache.
+ *
+ * If page_compression is enabled, a gzipped version of the page is stored in
+ * the cache to avoid compressing the output on each request. The cache entry
+ * is unzipped in the relatively rare event that the page is requested by a
+ * client without gzip support.
+ *
+ * Page compression requires the PHP zlib extension
+ * (http://php.net/manual/ref.zlib.php).
+ *
+ * @see drupal_page_header()
+ */
+function drupal_page_set_cache() {
+ global $base_root;
+
+ if (drupal_page_is_cacheable()) {
+
+ // Check whether the current page might be compressed.
+ $page_compressed = variable_get('page_compression', TRUE) && extension_loaded('zlib');
+
+ $cache = (object) array(
+ 'cid' => $base_root . request_uri(),
+ 'data' => array(
+ 'path' => $_GET['q'],
+ 'body' => ob_get_clean(),
+ 'title' => drupal_get_title(),
+ 'headers' => array(),
+ // We need to store whether page was compressed or not,
+ // because by the time it is read, the configuration might change.
+ 'page_compressed' => $page_compressed,
+ ),
+ 'expire' => CACHE_TEMPORARY,
+ 'created' => REQUEST_TIME,
+ );
+
+ // Restore preferred header names based on the lower-case names returned
+ // by drupal_get_http_header().
+ $header_names = _drupal_set_preferred_header_name();
+ foreach (drupal_get_http_header() as $name_lower => $value) {
+ $cache->data['headers'][$header_names[$name_lower]] = $value;
+ if ($name_lower == 'expires') {
+ // Use the actual timestamp from an Expires header if available.
+ $cache->expire = strtotime($value);
+ }
+ }
+
+ if ($cache->data['body']) {
+ if ($page_compressed) {
+ $cache->data['body'] = gzencode($cache->data['body'], 9, FORCE_GZIP);
+ }
+ cache_set($cache->cid, $cache->data, 'cache_page', $cache->expire);
+ }
+ return $cache;
+ }
+}
+
+/**
+ * Executes a cron run when called.
+ *
+ * Do not call this function from a test. Use $this->cronRun() instead.
+ *
+ * @return
+ * TRUE if cron ran successfully.
+ */
+function drupal_cron_run() {
+ // Allow execution to continue even if the request gets canceled.
+ @ignore_user_abort(TRUE);
+
+ // Prevent session information from being saved while cron is running.
+ $original_session_saving = drupal_save_session();
+ drupal_save_session(FALSE);
+
+ // Force the current user to anonymous to ensure consistent permissions on
+ // cron runs.
+ $original_user = $GLOBALS['user'];
+ $GLOBALS['user'] = drupal_anonymous_user();
+
+ // Try to allocate enough time to run all the hook_cron implementations.
+ drupal_set_time_limit(240);
+
+ $return = FALSE;
+ // Grab the defined cron queues.
+ $queues = module_invoke_all('cron_queue_info');
+ drupal_alter('cron_queue_info', $queues);
+
+ // Try to acquire cron lock.
+ if (!lock_acquire('cron', 240.0)) {
+ // Cron is still running normally.
+ watchdog('cron', 'Attempting to re-run cron while it is already running.', array(), WATCHDOG_WARNING);
+ }
+ else {
+ // Make sure every queue exists. There is no harm in trying to recreate an
+ // existing queue.
+ foreach ($queues as $queue_name => $info) {
+ DrupalQueue::get($queue_name)->createQueue();
+ }
+ // Register shutdown callback.
+ drupal_register_shutdown_function('drupal_cron_cleanup');
+
+ // Iterate through the modules calling their cron handlers (if any):
+ foreach (module_implements('cron') as $module) {
+ // Do not let an exception thrown by one module disturb another.
+ try {
+ module_invoke($module, 'cron');
+ }
+ catch (Exception $e) {
+ watchdog_exception('cron', $e);
+ }
+ }
+
+ // Record cron time.
+ variable_set('cron_last', REQUEST_TIME);
+ watchdog('cron', 'Cron run completed.', array(), WATCHDOG_NOTICE);
+
+ // Release cron lock.
+ lock_release('cron');
+
+ // Return TRUE so other functions can check if it did run successfully
+ $return = TRUE;
+ }
+
+ foreach ($queues as $queue_name => $info) {
+ if (!empty($info['skip on cron'])) {
+ // Do not run if queue wants to skip.
+ continue;
+ }
+ $function = $info['worker callback'];
+ $end = time() + (isset($info['time']) ? $info['time'] : 15);
+ $queue = DrupalQueue::get($queue_name);
+ while (time() < $end && ($item = $queue->claimItem())) {
+ $function($item->data);
+ $queue->deleteItem($item);
+ }
+ }
+ // Restore the user.
+ $GLOBALS['user'] = $original_user;
+ drupal_save_session($original_session_saving);
+
+ return $return;
+}
+
+/**
+ * Shutdown function: Performs cron cleanup.
+ *
+ * @see drupal_cron_run()
+ * @see drupal_register_shutdown_function()
+ */
+function drupal_cron_cleanup() {
+ // See if the semaphore is still locked.
+ if (variable_get('cron_semaphore', FALSE)) {
+ watchdog('cron', 'Cron run exceeded the time limit and was aborted.', array(), WATCHDOG_WARNING);
+
+ // Release cron semaphore.
+ variable_del('cron_semaphore');
+ }
+}
+
+/**
+ * Returns information about system object files (modules, themes, etc.).
+ *
+ * This function is used to find all or some system object files (module files,
+ * theme files, etc.) that exist on the site. It searches in several locations,
+ * depending on what type of object you are looking for. For instance, if you
+ * are looking for modules and call:
+ * @code
+ * drupal_system_listing("/\.module$/", "modules", 'name', 0);
+ * @endcode
+ * this function will search the site-wide modules directory (i.e., /modules/),
+ * your installation profile's directory (i.e.,
+ * /profiles/your_site_profile/modules/), the all-sites directory (i.e.,
+ * /sites/all/modules/), and your site-specific directory (i.e.,
+ * /sites/your_site_dir/modules/), in that order, and return information about
+ * all of the files ending in .module in those directories.
+ *
+ * The information is returned in an associative array, which can be keyed on
+ * the file name ($key = 'filename'), the file name without the extension ($key
+ * = 'name'), or the full file stream URI ($key = 'uri'). If you use a key of
+ * 'filename' or 'name', files found later in the search will take precedence
+ * over files found earlier (unless they belong to a module or theme not
+ * compatible with Drupal core); if you choose a key of 'uri', you will get all
+ * files found.
+ *
+ * @param string $mask
+ * The preg_match() regular expression for the files to find.
+ * @param string $directory
+ * The subdirectory name in which the files are found. For example,
+ * 'modules' will search in sub-directories of the top-level /modules
+ * directory, sub-directories of /sites/all/modules/, etc.
+ * @param string $key
+ * The key to be used for the associative array returned. Possible values are
+ * 'uri', for the file's URI; 'filename', for the basename of the file; and
+ * 'name' for the name of the file without the extension. If you choose 'name'
+ * or 'filename', only the highest-precedence file will be returned.
+ * @param int $min_depth
+ * Minimum depth of directories to return files from, relative to each
+ * directory searched. For instance, a minimum depth of 2 would find modules
+ * inside /modules/node/tests, but not modules directly in /modules/node.
+ *
+ * @return array
+ * An associative array of file objects, keyed on the chosen key. Each element
+ * in the array is an object containing file information, with properties:
+ * - 'uri': Full URI of the file.
+ * - 'filename': File name.
+ * - 'name': Name of file without the extension.
+ */
+function drupal_system_listing($mask, $directory, $key = 'name', $min_depth = 1) {
+ $config = conf_path();
+
+ $searchdir = array($directory);
+ $files = array();
+
+ // The 'profiles' directory contains pristine collections of modules and
+ // themes as organized by a distribution. It is pristine in the same way
+ // that /modules is pristine for core; users should avoid changing anything
+ // there in favor of sites/all or sites/<domain> directories.
+ $profiles = array();
+ $profile = drupal_get_profile();
+ // For SimpleTest to be able to test modules packaged together with a
+ // distribution we need to include the profile of the parent site (in which
+ // test runs are triggered).
+ if (drupal_valid_test_ua()) {
+ $testing_profile = variable_get('simpletest_parent_profile', FALSE);
+ if ($testing_profile && $testing_profile != $profile) {
+ $profiles[] = $testing_profile;
+ }
+ }
+ // In case both profile directories contain the same extension, the actual
+ // profile always has precedence.
+ $profiles[] = $profile;
+ foreach ($profiles as $profile) {
+ if (file_exists("profiles/$profile/$directory")) {
+ $searchdir[] = "profiles/$profile/$directory";
+ }
+ }
+
+ // Always search sites/all/* as well as the global directories.
+ $searchdir[] = 'sites/all/' . $directory;
+
+ if (file_exists("$config/$directory")) {
+ $searchdir[] = "$config/$directory";
+ }
+
+ // Get current list of items.
+ if (!function_exists('file_scan_directory')) {
+ require_once DRUPAL_ROOT . '/includes/file.inc';
+ }
+ foreach ($searchdir as $dir) {
+ $files_to_add = file_scan_directory($dir, $mask, array('key' => $key, 'min_depth' => $min_depth));
+
+ // Duplicate files found in later search directories take precedence over
+ // earlier ones, so we want them to overwrite keys in our resulting
+ // $files array.
+ // The exception to this is if the later file is from a module or theme not
+ // compatible with Drupal core. This may occur during upgrades of Drupal
+ // core when new modules exist in core while older contrib modules with the
+ // same name exist in a directory such as sites/all/modules/.
+ foreach (array_intersect_key($files_to_add, $files) as $file_key => $file) {
+ // If it has no info file, then we just behave liberally and accept the
+ // new resource on the list for merging.
+ if (file_exists($info_file = dirname($file->uri) . '/' . $file->name . '.info')) {
+ // Get the .info file for the module or theme this file belongs to.
+ $info = drupal_parse_info_file($info_file);
+
+ // If the module or theme is incompatible with Drupal core, remove it
+ // from the array for the current search directory, so it is not
+ // overwritten when merged with the $files array.
+ if (isset($info['core']) && $info['core'] != DRUPAL_CORE_COMPATIBILITY) {
+ unset($files_to_add[$file_key]);
+ }
+ }
+ }
+ $files = array_merge($files, $files_to_add);
+ }
+
+ return $files;
+}
+
+/**
+ * Sets the main page content value for later use.
+ *
+ * Given the nature of the Drupal page handling, this will be called once with
+ * a string or array. We store that and return it later as the block is being
+ * displayed.
+ *
+ * @param $content
+ * A string or renderable array representing the body of the page.
+ *
+ * @return
+ * If called without $content, a renderable array representing the body of
+ * the page.
+ */
+function drupal_set_page_content($content = NULL) {
+ $content_block = &drupal_static(__FUNCTION__, NULL);
+ $main_content_display = &drupal_static('system_main_content_added', FALSE);
+
+ if (!empty($content)) {
+ $content_block = (is_array($content) ? $content : array('main' => array('#markup' => $content)));
+ }
+ else {
+ // Indicate that the main content has been requested. We assume that
+ // the module requesting the content will be adding it to the page.
+ // A module can indicate that it does not handle the content by setting
+ // the static variable back to FALSE after calling this function.
+ $main_content_display = TRUE;
+ return $content_block;
+ }
+}
+
+/**
+ * #pre_render callback to render #browsers into #prefix and #suffix.
+ *
+ * @param $elements
+ * A render array with a '#browsers' property. The '#browsers' property can
+ * contain any or all of the following keys:
+ * - 'IE': If FALSE, the element is not rendered by Internet Explorer. If
+ * TRUE, the element is rendered by Internet Explorer. Can also be a string
+ * containing an expression for Internet Explorer to evaluate as part of a
+ * conditional comment. For example, this can be set to 'lt IE 7' for the
+ * element to be rendered in Internet Explorer 6, but not in Internet
+ * Explorer 7 or higher. Defaults to TRUE.
+ * - '!IE': If FALSE, the element is not rendered by browsers other than
+ * Internet Explorer. If TRUE, the element is rendered by those browsers.
+ * Defaults to TRUE.
+ * Examples:
+ * - To render an element in all browsers, '#browsers' can be left out or set
+ * to array('IE' => TRUE, '!IE' => TRUE).
+ * - To render an element in Internet Explorer only, '#browsers' can be set
+ * to array('!IE' => FALSE).
+ * - To render an element in Internet Explorer 6 only, '#browsers' can be set
+ * to array('IE' => 'lt IE 7', '!IE' => FALSE).
+ * - To render an element in Internet Explorer 8 and higher and in all other
+ * browsers, '#browsers' can be set to array('IE' => 'gte IE 8').
+ *
+ * @return
+ * The passed-in element with markup for conditional comments potentially
+ * added to '#prefix' and '#suffix'.
+ */
+function drupal_pre_render_conditional_comments($elements) {
+ $browsers = isset($elements['#browsers']) ? $elements['#browsers'] : array();
+ $browsers += array(
+ 'IE' => TRUE,
+ '!IE' => TRUE,
+ );
+
+ // If rendering in all browsers, no need for conditional comments.
+ if ($browsers['IE'] === TRUE && $browsers['!IE']) {
+ return $elements;
+ }
+
+ // Determine the conditional comment expression for Internet Explorer to
+ // evaluate.
+ if ($browsers['IE'] === TRUE) {
+ $expression = 'IE';
+ }
+ elseif ($browsers['IE'] === FALSE) {
+ $expression = '!IE';
+ }
+ else {
+ $expression = $browsers['IE'];
+ }
+
+ // Wrap the element's potentially existing #prefix and #suffix properties with
+ // conditional comment markup. The conditional comment expression is evaluated
+ // by Internet Explorer only. To control the rendering by other browsers,
+ // either the "downlevel-hidden" or "downlevel-revealed" technique must be
+ // used. See http://en.wikipedia.org/wiki/Conditional_comment for details.
+ $elements += array(
+ '#prefix' => '',
+ '#suffix' => '',
+ );
+ if (!$browsers['!IE']) {
+ // "downlevel-hidden".
+ $elements['#prefix'] = "\n<!--[if $expression]>\n" . $elements['#prefix'];
+ $elements['#suffix'] .= "<![endif]-->\n";
+ }
+ else {
+ // "downlevel-revealed".
+ $elements['#prefix'] = "\n<!--[if $expression]><!-->\n" . $elements['#prefix'];
+ $elements['#suffix'] .= "<!--<![endif]-->\n";
+ }
+
+ return $elements;
+}
+
+/**
+ * #pre_render callback to render a link into #markup.
+ *
+ * Doing so during pre_render gives modules a chance to alter the link parts.
+ *
+ * @param $elements
+ * A structured array whose keys form the arguments to l():
+ * - #title: The link text to pass as argument to l().
+ * - #href: The URL path component to pass as argument to l().
+ * - #options: (optional) An array of options to pass to l().
+ *
+ * @return
+ * The passed-in elements containing a rendered link in '#markup'.
+ */
+function drupal_pre_render_link($element) {
+ // By default, link options to pass to l() are normally set in #options.
+ $element += array('#options' => array());
+ // However, within the scope of renderable elements, #attributes is a valid
+ // way to specify attributes, too. Take them into account, but do not override
+ // attributes from #options.
+ if (isset($element['#attributes'])) {
+ $element['#options'] += array('attributes' => array());
+ $element['#options']['attributes'] += $element['#attributes'];
+ }
+
+ // This #pre_render callback can be invoked from inside or outside of a Form
+ // API context, and depending on that, a HTML ID may be already set in
+ // different locations. #options should have precedence over Form API's #id.
+ // #attributes have been taken over into #options above already.
+ if (isset($element['#options']['attributes']['id'])) {
+ $element['#id'] = $element['#options']['attributes']['id'];
+ }
+ elseif (isset($element['#id'])) {
+ $element['#options']['attributes']['id'] = $element['#id'];
+ }
+
+ // Conditionally invoke ajax_pre_render_element(), if #ajax is set.
+ if (isset($element['#ajax']) && !isset($element['#ajax_processed'])) {
+ // If no HTML ID was found above, automatically create one.
+ if (!isset($element['#id'])) {
+ $element['#id'] = $element['#options']['attributes']['id'] = drupal_html_id('ajax-link');
+ }
+ // If #ajax['path] was not specified, use the href as Ajax request URL.
+ if (!isset($element['#ajax']['path'])) {
+ $element['#ajax']['path'] = $element['#href'];
+ $element['#ajax']['options'] = $element['#options'];
+ }
+ $element = ajax_pre_render_element($element);
+ }
+
+ $element['#markup'] = l($element['#title'], $element['#href'], $element['#options']);
+ return $element;
+}
+
+/**
+ * #pre_render callback that collects child links into a single array.
+ *
+ * This function can be added as a pre_render callback for a renderable array,
+ * usually one which will be themed by theme_links(). It iterates through all
+ * unrendered children of the element, collects any #links properties it finds,
+ * merges them into the parent element's #links array, and prevents those
+ * children from being rendered separately.
+ *
+ * The purpose of this is to allow links to be logically grouped into related
+ * categories, so that each child group can be rendered as its own list of
+ * links if drupal_render() is called on it, but calling drupal_render() on the
+ * parent element will still produce a single list containing all the remaining
+ * links, regardless of what group they were in.
+ *
+ * A typical example comes from node links, which are stored in a renderable
+ * array similar to this:
+ * @code
+ * $node->content['links'] = array(
+ * '#theme' => 'links__node',
+ * '#pre_render' => array('drupal_pre_render_links'),
+ * 'comment' => array(
+ * '#theme' => 'links__node__comment',
+ * '#links' => array(
+ * // An array of links associated with node comments, suitable for
+ * // passing in to theme_links().
+ * ),
+ * ),
+ * 'statistics' => array(
+ * '#theme' => 'links__node__statistics',
+ * '#links' => array(
+ * // An array of links associated with node statistics, suitable for
+ * // passing in to theme_links().
+ * ),
+ * ),
+ * 'translation' => array(
+ * '#theme' => 'links__node__translation',
+ * '#links' => array(
+ * // An array of links associated with node translation, suitable for
+ * // passing in to theme_links().
+ * ),
+ * ),
+ * );
+ * @endcode
+ *
+ * In this example, the links are grouped by functionality, which can be
+ * helpful to themers who want to display certain kinds of links independently.
+ * For example, adding this code to node.tpl.php will result in the comment
+ * links being rendered as a single list:
+ * @code
+ * print render($content['links']['comment']);
+ * @endcode
+ *
+ * (where $node->content has been transformed into $content before handing
+ * control to the node.tpl.php template).
+ *
+ * The pre_render function defined here allows the above flexibility, but also
+ * allows the following code to be used to render all remaining links into a
+ * single list, regardless of their group:
+ * @code
+ * print render($content['links']);
+ * @endcode
+ *
+ * In the above example, this will result in the statistics and translation
+ * links being rendered together in a single list (but not the comment links,
+ * which were rendered previously on their own).
+ *
+ * Because of the way this function works, the individual properties of each
+ * group (for example, a group-specific #theme property such as
+ * 'links__node__comment' in the example above, or any other property such as
+ * #attributes or #pre_render that is attached to it) are only used when that
+ * group is rendered on its own. When the group is rendered together with other
+ * children, these child-specific properties are ignored, and only the overall
+ * properties of the parent are used.
+ */
+function drupal_pre_render_links($element) {
+ $element += array('#links' => array());
+ foreach (element_children($element) as $key) {
+ $child = &$element[$key];
+ // If the child has links which have not been printed yet and the user has
+ // access to it, merge its links in to the parent.
+ if (isset($child['#links']) && empty($child['#printed']) && (!isset($child['#access']) || $child['#access'])) {
+ $element['#links'] += $child['#links'];
+ // Mark the child as having been printed already (so that its links
+ // cannot be mistakenly rendered twice).
+ $child['#printed'] = TRUE;
+ }
+ }
+ return $element;
+}
+
+/**
+ * #pre_render callback to append contents in #markup to #children.
+ *
+ * This needs to be a #pre_render callback, because eventually assigned
+ * #theme_wrappers will expect the element's rendered content in #children.
+ * Note that if also a #theme is defined for the element, then the result of
+ * the theme callback will override #children.
+ *
+ * @param $elements
+ * A structured array using the #markup key.
+ *
+ * @return
+ * The passed-in elements, but #markup appended to #children.
+ *
+ * @see drupal_render()
+ */
+function drupal_pre_render_markup($elements) {
+ $elements['#children'] = $elements['#markup'];
+ return $elements;
+}
+
+/**
+ * Renders the page, including all theming.
+ *
+ * @param $page
+ * A string or array representing the content of a page. The array consists of
+ * the following keys:
+ * - #type: Value is always 'page'. This pushes the theming through
+ * page.tpl.php (required).
+ * - #show_messages: Suppress drupal_get_message() items. Used by Batch
+ * API (optional).
+ *
+ * @see hook_page_alter()
+ * @see element_info()
+ */
+function drupal_render_page($page) {
+ $main_content_display = &drupal_static('system_main_content_added', FALSE);
+
+ // Allow menu callbacks to return strings or arbitrary arrays to render.
+ // If the array returned is not of #type page directly, we need to fill
+ // in the page with defaults.
+ if (is_string($page) || (is_array($page) && (!isset($page['#type']) || ($page['#type'] != 'page')))) {
+ drupal_set_page_content($page);
+ $page = element_info('page');
+ }
+
+ // Modules can add elements to $page as needed in hook_page_build().
+ foreach (module_implements('page_build') as $module) {
+ $function = $module . '_page_build';
+ $function($page);
+ }
+ // Modules alter the $page as needed. Blocks are populated into regions like
+ // 'sidebar_first', 'footer', etc.
+ drupal_alter('page', $page);
+
+ // If no module has taken care of the main content, add it to the page now.
+ // This allows the site to still be usable even if no modules that
+ // control page regions (for example, the Block module) are enabled.
+ if (!$main_content_display) {
+ $page['content']['system_main'] = drupal_set_page_content();
+ }
+
+ return drupal_render($page);
+}
+
+/**
+ * Renders HTML given a structured array tree.
+ *
+ * Recursively iterates over each of the array elements, generating HTML code.
+ *
+ * Renderable arrays have two kinds of key/value pairs: properties and
+ * children. Properties have keys starting with '#' and their values influence
+ * how the array will be rendered. Children are all elements whose keys do not
+ * start with a '#'. Their values should be renderable arrays themselves,
+ * which will be rendered during the rendering of the parent array. The markup
+ * provided by the children is typically inserted into the markup generated by
+ * the parent array.
+ *
+ * HTML generation for a renderable array, and the treatment of any children,
+ * is controlled by two properties containing theme functions, #theme and
+ * #theme_wrappers.
+ *
+ * #theme is the theme function called first. If it is set and the element has
+ * any children, it is the responsibility of the theme function to render
+ * these children. For elements that are not allowed to have any children,
+ * e.g. buttons or textfields, the theme function can be used to render the
+ * element itself. If #theme is not present and the element has children, each
+ * child is itself rendered by a call to drupal_render(), and the results are
+ * concatenated.
+ *
+ * The #theme_wrappers property contains an array of theme functions which will
+ * be called, in order, after #theme has run. These can be used to add further
+ * markup around the rendered children; e.g., fieldsets add the required markup
+ * for a fieldset around their rendered child elements. All wrapper theme
+ * functions have to include the element's #children property in their output,
+ * as it contains the output of the previous theme functions and the rendered
+ * children.
+ *
+ * For example, for the form element type, by default only the #theme_wrappers
+ * property is set, which adds the form markup around the rendered child
+ * elements of the form. This allows you to set the #theme property on a
+ * specific form to a custom theme function, giving you complete control over
+ * the placement of the form's children while not at all having to deal with
+ * the form markup itself.
+ *
+ * drupal_render() can optionally cache the rendered output of elements to
+ * improve performance. To use drupal_render() caching, set the element's #cache
+ * property to an associative array with one or several of the following keys:
+ * - 'keys': An array of one or more keys that identify the element. If 'keys'
+ * is set, the cache ID is created automatically from these keys. See
+ * drupal_render_cid_create().
+ * - 'granularity' (optional): Define the cache granularity using binary
+ * combinations of the cache granularity constants, e.g.
+ * DRUPAL_CACHE_PER_USER to cache for each user separately or
+ * DRUPAL_CACHE_PER_PAGE | DRUPAL_CACHE_PER_ROLE to cache separately for each
+ * page and role. If not specified the element is cached globally for each
+ * theme and language.
+ * - 'cid': Specify the cache ID directly. Either 'keys' or 'cid' is required.
+ * If 'cid' is set, 'keys' and 'granularity' are ignored. Use only if you
+ * have special requirements.
+ * - 'expire': Set to one of the cache lifetime constants.
+ * - 'bin': Specify a cache bin to cache the element in. Defaults to 'cache'.
+ *
+ * This function is usually called from within another function, like
+ * drupal_get_form() or a theme function. Elements are sorted internally
+ * using uasort(). Since this is expensive, when passing already sorted
+ * elements to drupal_render(), for example from a database query, set
+ * $elements['#sorted'] = TRUE to avoid sorting them a second time.
+ *
+ * drupal_render() flags each element with a '#printed' status to indicate that
+ * the element has been rendered, which allows individual elements of a given
+ * array to be rendered independently and prevents them from being rendered
+ * more than once on subsequent calls to drupal_render() (e.g., as part of a
+ * larger array). If the same array or array element is passed more than once
+ * to drupal_render(), it simply returns an empty string.
+ *
+ * @param array $elements
+ * The structured array describing the data to be rendered.
+ *
+ * @return string
+ * The rendered HTML.
+ */
+function drupal_render(&$elements) {
+ // Early-return nothing if user does not have access.
+ if (empty($elements) || (isset($elements['#access']) && !$elements['#access'])) {
+ return '';
+ }
+
+ // Do not print elements twice.
+ if (!empty($elements['#printed'])) {
+ return '';
+ }
+
+ // Try to fetch the element's markup from cache and return.
+ if (isset($elements['#cache'])) {
+ $cached_output = drupal_render_cache_get($elements);
+ if ($cached_output !== FALSE) {
+ return $cached_output;
+ }
+ }
+
+ // If #markup is set, ensure #type is set. This allows to specify just #markup
+ // on an element without setting #type.
+ if (isset($elements['#markup']) && !isset($elements['#type'])) {
+ $elements['#type'] = 'markup';
+ }
+
+ // If the default values for this element have not been loaded yet, populate
+ // them.
+ if (isset($elements['#type']) && empty($elements['#defaults_loaded'])) {
+ $elements += element_info($elements['#type']);
+ }
+
+ // Make any final changes to the element before it is rendered. This means
+ // that the $element or the children can be altered or corrected before the
+ // element is rendered into the final text.
+ if (isset($elements['#pre_render'])) {
+ foreach ($elements['#pre_render'] as $function) {
+ if (function_exists($function)) {
+ $elements = $function($elements);
+ }
+ }
+ }
+
+ // Allow #pre_render to abort rendering.
+ if (!empty($elements['#printed'])) {
+ return '';
+ }
+
+ // Get the children of the element, sorted by weight.
+ $children = element_children($elements, TRUE);
+
+ // Initialize this element's #children, unless a #pre_render callback already
+ // preset #children.
+ if (!isset($elements['#children'])) {
+ $elements['#children'] = '';
+ }
+ // Call the element's #theme function if it is set. Then any children of the
+ // element have to be rendered there.
+ if (isset($elements['#theme'])) {
+ $elements['#children'] = theme($elements['#theme'], $elements);
+ }
+ // If #theme was not set and the element has children, render them now.
+ // This is the same process as drupal_render_children() but is inlined
+ // for speed.
+ if ($elements['#children'] == '') {
+ foreach ($children as $key) {
+ $elements['#children'] .= drupal_render($elements[$key]);
+ }
+ }
+
+ // Let the theme functions in #theme_wrappers add markup around the rendered
+ // children.
+ if (isset($elements['#theme_wrappers'])) {
+ foreach ($elements['#theme_wrappers'] as $theme_wrapper) {
+ $elements['#children'] = theme($theme_wrapper, $elements);
+ }
+ }
+
+ // Filter the outputted content and make any last changes before the
+ // content is sent to the browser. The changes are made on $content
+ // which allows the output'ed text to be filtered.
+ if (isset($elements['#post_render'])) {
+ foreach ($elements['#post_render'] as $function) {
+ if (function_exists($function)) {
+ $elements['#children'] = $function($elements['#children'], $elements);
+ }
+ }
+ }
+
+ // Add any JavaScript state information associated with the element.
+ if (!empty($elements['#states'])) {
+ drupal_process_states($elements);
+ }
+
+ // Add additional libraries, CSS, JavaScript an other custom
+ // attached data associated with this element.
+ if (!empty($elements['#attached'])) {
+ drupal_process_attached($elements);
+ }
+
+ $prefix = isset($elements['#prefix']) ? $elements['#prefix'] : '';
+ $suffix = isset($elements['#suffix']) ? $elements['#suffix'] : '';
+ $output = $prefix . $elements['#children'] . $suffix;
+
+ // Cache the processed element if #cache is set.
+ if (isset($elements['#cache'])) {
+ drupal_render_cache_set($output, $elements);
+ }
+
+ $elements['#printed'] = TRUE;
+ return $output;
+}
+
+/**
+ * Renders children of an element and concatenates them.
+ *
+ * This renders all children of an element using drupal_render() and then
+ * joins them together into a single string.
+ *
+ * @param $element
+ * The structured array whose children shall be rendered.
+ * @param $children_keys
+ * If the keys of the element's children are already known, they can be passed
+ * in to save another run of element_children().
+ */
+function drupal_render_children(&$element, $children_keys = NULL) {
+ if ($children_keys === NULL) {
+ $children_keys = element_children($element);
+ }
+ $output = '';
+ foreach ($children_keys as $key) {
+ if (!empty($element[$key])) {
+ $output .= drupal_render($element[$key]);
+ }
+ }
+ return $output;
+}
+
+/**
+ * Renders an element.
+ *
+ * This function renders an element using drupal_render(). The top level
+ * element is shown with show() before rendering, so it will always be rendered
+ * even if hide() had been previously used on it.
+ *
+ * @param $element
+ * The element to be rendered.
+ *
+ * @return
+ * The rendered element.
+ *
+ * @see drupal_render()
+ * @see show()
+ * @see hide()
+ */
+function render(&$element) {
+ if (is_array($element)) {
+ show($element);
+ return drupal_render($element);
+ }
+ else {
+ // Safe-guard for inappropriate use of render() on flat variables: return
+ // the variable as-is.
+ return $element;
+ }
+}
+
+/**
+ * Hides an element from later rendering.
+ *
+ * The first time render() or drupal_render() is called on an element tree,
+ * as each element in the tree is rendered, it is marked with a #printed flag
+ * and the rendered children of the element are cached. Subsequent calls to
+ * render() or drupal_render() will not traverse the child tree of this element
+ * again: they will just use the cached children. So if you want to hide an
+ * element, be sure to call hide() on the element before its parent tree is
+ * rendered for the first time, as it will have no effect on subsequent
+ * renderings of the parent tree.
+ *
+ * @param $element
+ * The element to be hidden.
+ *
+ * @return
+ * The element.
+ *
+ * @see render()
+ * @see show()
+ */
+function hide(&$element) {
+ $element['#printed'] = TRUE;
+ return $element;
+}
+
+/**
+ * Shows a hidden element for later rendering.
+ *
+ * You can also use render($element), which shows the element while rendering
+ * it.
+ *
+ * The first time render() or drupal_render() is called on an element tree,
+ * as each element in the tree is rendered, it is marked with a #printed flag
+ * and the rendered children of the element are cached. Subsequent calls to
+ * render() or drupal_render() will not traverse the child tree of this element
+ * again: they will just use the cached children. So if you want to show an
+ * element, be sure to call show() on the element before its parent tree is
+ * rendered for the first time, as it will have no effect on subsequent
+ * renderings of the parent tree.
+ *
+ * @param $element
+ * The element to be shown.
+ *
+ * @return
+ * The element.
+ *
+ * @see render()
+ * @see hide()
+ */
+function show(&$element) {
+ $element['#printed'] = FALSE;
+ return $element;
+}
+
+/**
+ * Gets the rendered output of a renderable element from the cache.
+ *
+ * @param $elements
+ * A renderable array.
+ *
+ * @return
+ * A markup string containing the rendered content of the element, or FALSE
+ * if no cached copy of the element is available.
+ *
+ * @see drupal_render()
+ * @see drupal_render_cache_set()
+ */
+function drupal_render_cache_get($elements) {
+ if (!in_array($_SERVER['REQUEST_METHOD'], array('GET', 'HEAD')) || !$cid = drupal_render_cid_create($elements)) {
+ return FALSE;
+ }
+ $bin = isset($elements['#cache']['bin']) ? $elements['#cache']['bin'] : 'cache';
+
+ if (!empty($cid) && $cache = cache_get($cid, $bin)) {
+ // Add additional libraries, JavaScript, CSS and other data attached
+ // to this element.
+ if (isset($cache->data['#attached'])) {
+ drupal_process_attached($cache->data);
+ }
+ // Return the rendered output.
+ return $cache->data['#markup'];
+ }
+ return FALSE;
+}
+
+/**
+ * Caches the rendered output of a renderable element.
+ *
+ * This is called by drupal_render() if the #cache property is set on an
+ * element.
+ *
+ * @param $markup
+ * The rendered output string of $elements.
+ * @param $elements
+ * A renderable array.
+ *
+ * @see drupal_render_cache_get()
+ */
+function drupal_render_cache_set(&$markup, $elements) {
+ // Create the cache ID for the element.
+ if (!in_array($_SERVER['REQUEST_METHOD'], array('GET', 'HEAD')) || !$cid = drupal_render_cid_create($elements)) {
+ return FALSE;
+ }
+
+ // Cache implementations are allowed to modify the markup, to support
+ // replacing markup with edge-side include commands. The supporting cache
+ // backend will store the markup in some other key (like
+ // $data['#real-value']) and return an include command instead. When the
+ // ESI command is executed by the content accelerator, the real value can
+ // be retrieved and used.
+ $data['#markup'] = &$markup;
+ // Persist attached data associated with this element.
+ $attached = drupal_render_collect_attached($elements, TRUE);
+ if ($attached) {
+ $data['#attached'] = $attached;
+ }
+ $bin = isset($elements['#cache']['bin']) ? $elements['#cache']['bin'] : 'cache';
+ $expire = isset($elements['#cache']['expire']) ? $elements['#cache']['expire'] : CACHE_PERMANENT;
+ cache_set($cid, $data, $bin, $expire);
+}
+
+/**
+ * Collects #attached for an element and its children into a single array.
+ *
+ * When caching elements, it is necessary to collect all libraries, JavaScript
+ * and CSS into a single array, from both the element itself and all child
+ * elements. This allows drupal_render() to add these back to the page when the
+ * element is returned from cache.
+ *
+ * @param $elements
+ * The element to collect #attached from.
+ * @param $return
+ * Whether to return the attached elements and reset the internal static.
+ *
+ * @return
+ * The #attached array for this element and its descendants.
+ */
+function drupal_render_collect_attached($elements, $return = FALSE) {
+ $attached = &drupal_static(__FUNCTION__, array());
+
+ // Collect all #attached for this element.
+ if (isset($elements['#attached'])) {
+ foreach ($elements['#attached'] as $key => $value) {
+ if (!isset($attached[$key])) {
+ $attached[$key] = array();
+ }
+ $attached[$key] = array_merge($attached[$key], $value);
+ }
+ }
+ if ($children = element_children($elements)) {
+ foreach ($children as $child) {
+ drupal_render_collect_attached($elements[$child]);
+ }
+ }
+
+ // If this was the first call to the function, return all attached elements
+ // and reset the static cache.
+ if ($return) {
+ $return = $attached;
+ $attached = array();
+ return $return;
+ }
+}
+
+/**
+ * Prepares an element for caching based on a query.
+ *
+ * This smart caching strategy saves Drupal from querying and rendering to HTML
+ * when the underlying query is unchanged.
+ *
+ * Expensive queries should use the query builder to create the query and then
+ * call this function. Executing the query and formatting results should happen
+ * in a #pre_render callback.
+ *
+ * @param $query
+ * A select query object as returned by db_select().
+ * @param $function
+ * The name of the function doing this caching. A _pre_render suffix will be
+ * added to this string and is also part of the cache key in
+ * drupal_render_cache_set() and drupal_render_cache_get().
+ * @param $expire
+ * The cache expire time, passed eventually to cache_set().
+ * @param $granularity
+ * One or more granularity constants passed to drupal_render_cid_parts().
+ *
+ * @return
+ * A renderable array with the following keys and values:
+ * - #query: The passed-in $query.
+ * - #pre_render: $function with a _pre_render suffix.
+ * - #cache: An associative array prepared for drupal_render_cache_set().
+ */
+function drupal_render_cache_by_query($query, $function, $expire = CACHE_TEMPORARY, $granularity = NULL) {
+ $cache_keys = array_merge(array($function), drupal_render_cid_parts($granularity));
+ $query->preExecute();
+ $cache_keys[] = hash('sha256', serialize(array((string) $query, $query->getArguments())));
+ return array(
+ '#query' => $query,
+ '#pre_render' => array($function . '_pre_render'),
+ '#cache' => array(
+ 'keys' => $cache_keys,
+ 'expire' => $expire,
+ ),
+ );
+}
+
+/**
+ * Returns cache ID parts for building a cache ID.
+ *
+ * @param $granularity
+ * One or more cache granularity constants. For example, to cache separately
+ * for each user, use DRUPAL_CACHE_PER_USER. To cache separately for each
+ * page and role, use the expression:
+ * @code
+ * DRUPAL_CACHE_PER_PAGE | DRUPAL_CACHE_PER_ROLE
+ * @endcode
+ *
+ * @return
+ * An array of cache ID parts, always containing the active theme. If the
+ * locale module is enabled it also contains the active language. If
+ * $granularity was passed in, more parts are added.
+ */
+function drupal_render_cid_parts($granularity = NULL) {
+ global $theme, $base_root, $user;
+
+ $cid_parts[] = $theme;
+ // If Locale is enabled but we have only one language we do not need it as cid
+ // part.
+ if (drupal_multilingual()) {
+ foreach (language_types_configurable() as $language_type) {
+ $cid_parts[] = $GLOBALS[$language_type]->language;
+ }
+ }
+
+ if (!empty($granularity)) {
+ // 'PER_ROLE' and 'PER_USER' are mutually exclusive. 'PER_USER' can be a
+ // resource drag for sites with many users, so when a module is being
+ // equivocal, we favor the less expensive 'PER_ROLE' pattern.
+ if ($granularity & DRUPAL_CACHE_PER_ROLE) {
+ $cid_parts[] = 'r.' . implode(',', array_keys($user->roles));
+ }
+ elseif ($granularity & DRUPAL_CACHE_PER_USER) {
+ $cid_parts[] = "u.$user->uid";
+ }
+
+ if ($granularity & DRUPAL_CACHE_PER_PAGE) {
+ $cid_parts[] = $base_root . request_uri();
+ }
+ }
+
+ return $cid_parts;
+}
+
+/**
+ * Creates the cache ID for a renderable element.
+ *
+ * This creates the cache ID string, either by returning the #cache['cid']
+ * property if present or by building the cache ID out of the #cache['keys']
+ * and, optionally, the #cache['granularity'] properties.
+ *
+ * @param $elements
+ * A renderable array.
+ *
+ * @return
+ * The cache ID string, or FALSE if the element may not be cached.
+ */
+function drupal_render_cid_create($elements) {
+ if (isset($elements['#cache']['cid'])) {
+ return $elements['#cache']['cid'];
+ }
+ elseif (isset($elements['#cache']['keys'])) {
+ $granularity = isset($elements['#cache']['granularity']) ? $elements['#cache']['granularity'] : NULL;
+ // Merge in additional cache ID parts based provided by drupal_render_cid_parts().
+ $cid_parts = array_merge($elements['#cache']['keys'], drupal_render_cid_parts($granularity));
+ return implode(':', $cid_parts);
+ }
+ return FALSE;
+}
+
+/**
+ * Function used by uasort to sort structured arrays by weight.
+ */
+function element_sort($a, $b) {
+ $a_weight = (is_array($a) && isset($a['#weight'])) ? $a['#weight'] : 0;
+ $b_weight = (is_array($b) && isset($b['#weight'])) ? $b['#weight'] : 0;
+ if ($a_weight == $b_weight) {
+ return 0;
+ }
+ return ($a_weight < $b_weight) ? -1 : 1;
+}
+
+/**
+ * Array sorting callback; sorts elements by title.
+ */
+function element_sort_by_title($a, $b) {
+ $a_title = (is_array($a) && isset($a['#title'])) ? $a['#title'] : '';
+ $b_title = (is_array($b) && isset($b['#title'])) ? $b['#title'] : '';
+ return strnatcasecmp($a_title, $b_title);
+}
+
+/**
+ * Retrieves the default properties for the defined element type.
+ *
+ * @param $type
+ * An element type as defined by hook_element_info().
+ */
+function element_info($type) {
+ // Use the advanced drupal_static() pattern, since this is called very often.
+ static $drupal_static_fast;
+ if (!isset($drupal_static_fast)) {
+ $drupal_static_fast['cache'] = &drupal_static(__FUNCTION__);
+ }
+ $cache = &$drupal_static_fast['cache'];
+
+ if (!isset($cache)) {
+ $cache = module_invoke_all('element_info');
+ foreach ($cache as $element_type => $info) {
+ $cache[$element_type]['#type'] = $element_type;
+ }
+ // Allow modules to alter the element type defaults.
+ drupal_alter('element_info', $cache);
+ }
+
+ return isset($cache[$type]) ? $cache[$type] : array();
+}
+
+/**
+ * Retrieves a single property for the defined element type.
+ *
+ * @param $type
+ * An element type as defined by hook_element_info().
+ * @param $property_name
+ * The property within the element type that should be returned.
+ * @param $default
+ * (Optional) The value to return if the element type does not specify a
+ * value for the property. Defaults to NULL.
+ */
+function element_info_property($type, $property_name, $default = NULL) {
+ return (($info = element_info($type)) && array_key_exists($property_name, $info)) ? $info[$property_name] : $default;
+}
+
+/**
+ * Sorts a structured array by the 'weight' element.
+ *
+ * Note that the sorting is by the 'weight' array element, not by the render
+ * element property '#weight'.
+ *
+ * Callback for uasort() used in various functions.
+ *
+ * @param $a
+ * First item for comparison. The compared items should be associative arrays
+ * that optionally include a 'weight' element. For items without a 'weight'
+ * element, a default value of 0 will be used.
+ * @param $b
+ * Second item for comparison.
+ */
+function drupal_sort_weight($a, $b) {
+ $a_weight = (is_array($a) && isset($a['weight'])) ? $a['weight'] : 0;
+ $b_weight = (is_array($b) && isset($b['weight'])) ? $b['weight'] : 0;
+ if ($a_weight == $b_weight) {
+ return 0;
+ }
+ return ($a_weight < $b_weight) ? -1 : 1;
+}
+
+/**
+ * Array sorting callback; sorts elements by 'title' key.
+ */
+function drupal_sort_title($a, $b) {
+ if (!isset($b['title'])) {
+ return -1;
+ }
+ if (!isset($a['title'])) {
+ return 1;
+ }
+ return strcasecmp($a['title'], $b['title']);
+}
+
+/**
+ * Checks if the key is a property.
+ */
+function element_property($key) {
+ return $key[0] == '#';
+}
+
+/**
+ * Gets properties of a structured array element (keys beginning with '#').
+ */
+function element_properties($element) {
+ return array_filter(array_keys((array) $element), 'element_property');
+}
+
+/**
+ * Checks if the key is a child.
+ */
+function element_child($key) {
+ return !isset($key[0]) || $key[0] != '#';
+}
+
+/**
+ * Identifies the children of an element array, optionally sorted by weight.
+ *
+ * The children of a element array are those key/value pairs whose key does
+ * not start with a '#'. See drupal_render() for details.
+ *
+ * @param $elements
+ * The element array whose children are to be identified.
+ * @param $sort
+ * Boolean to indicate whether the children should be sorted by weight.
+ *
+ * @return
+ * The array keys of the element's children.
+ */
+function element_children(&$elements, $sort = FALSE) {
+ // Do not attempt to sort elements which have already been sorted.
+ $sort = isset($elements['#sorted']) ? !$elements['#sorted'] : $sort;
+
+ // Filter out properties from the element, leaving only children.
+ $children = array();
+ $sortable = FALSE;
+ foreach ($elements as $key => $value) {
+ if ($key === '' || $key[0] !== '#') {
+ $children[$key] = $value;
+ if (is_array($value) && isset($value['#weight'])) {
+ $sortable = TRUE;
+ }
+ }
+ }
+ // Sort the children if necessary.
+ if ($sort && $sortable) {
+ uasort($children, 'element_sort');
+ // Put the sorted children back into $elements in the correct order, to
+ // preserve sorting if the same element is passed through
+ // element_children() twice.
+ foreach ($children as $key => $child) {
+ unset($elements[$key]);
+ $elements[$key] = $child;
+ }
+ $elements['#sorted'] = TRUE;
+ }
+
+ return array_keys($children);
+}
+
+/**
+ * Returns the visible children of an element.
+ *
+ * @param $elements
+ * The parent element.
+ *
+ * @return
+ * The array keys of the element's visible children.
+ */
+function element_get_visible_children(array $elements) {
+ $visible_children = array();
+
+ foreach (element_children($elements) as $key) {
+ $child = $elements[$key];
+
+ // Skip un-accessible children.
+ if (isset($child['#access']) && !$child['#access']) {
+ continue;
+ }
+
+ // Skip value and hidden elements, since they are not rendered.
+ if (isset($child['#type']) && in_array($child['#type'], array('value', 'hidden'))) {
+ continue;
+ }
+
+ $visible_children[$key] = $child;
+ }
+
+ return array_keys($visible_children);
+}
+
+/**
+ * Sets HTML attributes based on element properties.
+ *
+ * @param $element
+ * The renderable element to process.
+ * @param $map
+ * An associative array whose keys are element property names and whose values
+ * are the HTML attribute names to set for corresponding the property; e.g.,
+ * array('#propertyname' => 'attributename'). If both names are identical
+ * except for the leading '#', then an attribute name value is sufficient and
+ * no property name needs to be specified.
+ */
+function element_set_attributes(array &$element, array $map) {
+ foreach ($map as $property => $attribute) {
+ // If the key is numeric, the attribute name needs to be taken over.
+ if (is_int($property)) {
+ $property = '#' . $attribute;
+ }
+ // Do not overwrite already existing attributes.
+ if (isset($element[$property]) && !isset($element['#attributes'][$attribute])) {
+ $element['#attributes'][$attribute] = $element[$property];
+ }
+ }
+}
+
+/**
+ * Recursively computes the difference of arrays with additional index check.
+ *
+ * This is a version of array_diff_assoc() that supports multidimensional
+ * arrays.
+ *
+ * @param array $array1
+ * The array to compare from.
+ * @param array $array2
+ * The array to compare to.
+ *
+ * @return array
+ * Returns an array containing all the values from array1 that are not present
+ * in array2.
+ */
+function drupal_array_diff_assoc_recursive($array1, $array2) {
+ $difference = array();
+
+ foreach ($array1 as $key => $value) {
+ if (is_array($value)) {
+ if (!array_key_exists($key, $array2) || !is_array($array2[$key])) {
+ $difference[$key] = $value;
+ }
+ else {
+ $new_diff = drupal_array_diff_assoc_recursive($value, $array2[$key]);
+ if (!empty($new_diff)) {
+ $difference[$key] = $new_diff;
+ }
+ }
+ }
+ elseif (!array_key_exists($key, $array2) || $array2[$key] !== $value) {
+ $difference[$key] = $value;
+ }
+ }
+
+ return $difference;
+}
+
+/**
+ * Sets a value in a nested array with variable depth.
+ *
+ * This helper function should be used when the depth of the array element you
+ * are changing may vary (that is, the number of parent keys is variable). It
+ * is primarily used for form structures and renderable arrays.
+ *
+ * Example:
+ * @code
+ * // Assume you have a 'signature' element somewhere in a form. It might be:
+ * $form['signature_settings']['signature'] = array(
+ * '#type' => 'text_format',
+ * '#title' => t('Signature'),
+ * );
+ * // Or, it might be further nested:
+ * $form['signature_settings']['user']['signature'] = array(
+ * '#type' => 'text_format',
+ * '#title' => t('Signature'),
+ * );
+ * @endcode
+ *
+ * To deal with the situation, the code needs to figure out the route to the
+ * element, given an array of parents that is either
+ * @code array('signature_settings', 'signature') @endcode in the first case or
+ * @code array('signature_settings', 'user', 'signature') @endcode in the second
+ * case.
+ *
+ * Without this helper function the only way to set the signature element in one
+ * line would be using eval(), which should be avoided:
+ * @code
+ * // Do not do this! Avoid eval().
+ * eval('$form[\'' . implode("']['", $parents) . '\'] = $element;');
+ * @endcode
+ *
+ * Instead, use this helper function:
+ * @code
+ * drupal_array_set_nested_value($form, $parents, $element);
+ * @endcode
+ *
+ * However if the number of array parent keys is static, the value should always
+ * be set directly rather than calling this function. For instance, for the
+ * first example we could just do:
+ * @code
+ * $form['signature_settings']['signature'] = $element;
+ * @endcode
+ *
+ * @param $array
+ * A reference to the array to modify.
+ * @param $parents
+ * An array of parent keys, starting with the outermost key.
+ * @param $value
+ * The value to set.
+ * @param $force
+ * (Optional) If TRUE, the value is forced into the structure even if it
+ * requires the deletion of an already existing non-array parent value. If
+ * FALSE, PHP throws an error if trying to add into a value that is not an
+ * array. Defaults to FALSE.
+ *
+ * @see drupal_array_get_nested_value()
+ */
+function drupal_array_set_nested_value(array &$array, array $parents, $value, $force = FALSE) {
+ $ref = &$array;
+ foreach ($parents as $parent) {
+ // PHP auto-creates container arrays and NULL entries without error if $ref
+ // is NULL, but throws an error if $ref is set, but not an array.
+ if ($force && isset($ref) && !is_array($ref)) {
+ $ref = array();
+ }
+ $ref = &$ref[$parent];
+ }
+ $ref = $value;
+}
+
+/**
+ * Retrieves a value from a nested array with variable depth.
+ *
+ * This helper function should be used when the depth of the array element being
+ * retrieved may vary (that is, the number of parent keys is variable). It is
+ * primarily used for form structures and renderable arrays.
+ *
+ * Without this helper function the only way to get a nested array value with
+ * variable depth in one line would be using eval(), which should be avoided:
+ * @code
+ * // Do not do this! Avoid eval().
+ * // May also throw a PHP notice, if the variable array keys do not exist.
+ * eval('$value = $array[\'' . implode("']['", $parents) . "'];");
+ * @endcode
+ *
+ * Instead, use this helper function:
+ * @code
+ * $value = drupal_array_get_nested_value($form, $parents);
+ * @endcode
+ *
+ * The return value will be NULL, regardless of whether the actual value is NULL
+ * or whether the requested key does not exist. If it is required to know
+ * whether the nested array key actually exists, pass a third argument that is
+ * altered by reference:
+ * @code
+ * $key_exists = NULL;
+ * $value = drupal_array_get_nested_value($form, $parents, $key_exists);
+ * if ($key_exists) {
+ * // ... do something with $value ...
+ * }
+ * @endcode
+ *
+ * However if the number of array parent keys is static, the value should always
+ * be retrieved directly rather than calling this function. For instance:
+ * @code
+ * $value = $form['signature_settings']['signature'];
+ * @endcode
+ *
+ * @param $array
+ * The array from which to get the value.
+ * @param $parents
+ * An array of parent keys of the value, starting with the outermost key.
+ * @param $key_exists
+ * (optional) If given, an already defined variable that is altered by
+ * reference.
+ *
+ * @return
+ * The requested nested value. Possibly NULL if the value is NULL or not all
+ * nested parent keys exist. $key_exists is altered by reference and is a
+ * Boolean that indicates whether all nested parent keys exist (TRUE) or not
+ * (FALSE). This allows to distinguish between the two possibilities when NULL
+ * is returned.
+ *
+ * @see drupal_array_set_nested_value()
+ */
+function &drupal_array_get_nested_value(array &$array, array $parents, &$key_exists = NULL) {
+ $ref = &$array;
+ foreach ($parents as $parent) {
+ if (is_array($ref) && array_key_exists($parent, $ref)) {
+ $ref = &$ref[$parent];
+ }
+ else {
+ $key_exists = FALSE;
+ $null = NULL;
+ return $null;
+ }
+ }
+ $key_exists = TRUE;
+ return $ref;
+}
+
+/**
+ * Determines whether a nested array contains the requested keys.
+ *
+ * This helper function should be used when the depth of the array element to be
+ * checked may vary (that is, the number of parent keys is variable). See
+ * drupal_array_set_nested_value() for details. It is primarily used for form
+ * structures and renderable arrays.
+ *
+ * If it is required to also get the value of the checked nested key, use
+ * drupal_array_get_nested_value() instead.
+ *
+ * If the number of array parent keys is static, this helper function is
+ * unnecessary and the following code can be used instead:
+ * @code
+ * $value_exists = isset($form['signature_settings']['signature']);
+ * $key_exists = array_key_exists('signature', $form['signature_settings']);
+ * @endcode
+ *
+ * @param $array
+ * The array with the value to check for.
+ * @param $parents
+ * An array of parent keys of the value, starting with the outermost key.
+ *
+ * @return
+ * TRUE if all the parent keys exist, FALSE otherwise.
+ *
+ * @see drupal_array_get_nested_value()
+ */
+function drupal_array_nested_key_exists(array $array, array $parents) {
+ // Although this function is similar to PHP's array_key_exists(), its
+ // arguments should be consistent with drupal_array_get_nested_value().
+ $key_exists = NULL;
+ drupal_array_get_nested_value($array, $parents, $key_exists);
+ return $key_exists;
+}
+
+/**
+ * Provides theme registration for themes across .inc files.
+ */
+function drupal_common_theme() {
+ return array(
+ // From theme.inc.
+ 'html' => array(
+ 'render element' => 'page',
+ 'template' => 'html',
+ ),
+ 'page' => array(
+ 'render element' => 'page',
+ 'template' => 'page',
+ ),
+ 'region' => array(
+ 'render element' => 'elements',
+ 'template' => 'region',
+ ),
+ 'status_messages' => array(
+ 'variables' => array('display' => NULL),
+ ),
+ 'link' => array(
+ 'variables' => array('text' => NULL, 'path' => NULL, 'options' => array()),
+ ),
+ 'links' => array(
+ 'variables' => array('links' => NULL, 'attributes' => array('class' => array('links')), 'heading' => array()),
+ ),
+ 'image' => array(
+ // HTML 4 and XHTML 1.0 always require an alt attribute. The HTML 5 draft
+ // allows the alt attribute to be omitted in some cases. Therefore,
+ // default the alt attribute to an empty string, but allow code calling
+ // theme('image') to pass explicit NULL for it to be omitted. Usually,
+ // neither omission nor an empty string satisfies accessibility
+ // requirements, so it is strongly encouraged for code calling
+ // theme('image') to pass a meaningful value for the alt variable.
+ // - http://www.w3.org/TR/REC-html40/struct/objects.html#h-13.8
+ // - http://www.w3.org/TR/xhtml1/dtds.html
+ // - http://dev.w3.org/html5/spec/Overview.html#alt
+ // The title attribute is optional in all cases, so it is omitted by
+ // default.
+ 'variables' => array('path' => NULL, 'width' => NULL, 'height' => NULL, 'alt' => '', 'title' => NULL, 'attributes' => array()),
+ ),
+ 'breadcrumb' => array(
+ 'variables' => array('breadcrumb' => NULL),
+ ),
+ 'help' => array(
+ 'variables' => array(),
+ ),
+ 'table' => array(
+ 'variables' => array('header' => NULL, 'rows' => NULL, 'attributes' => array(), 'caption' => NULL, 'colgroups' => array(), 'sticky' => TRUE, 'empty' => ''),
+ ),
+ 'tablesort_indicator' => array(
+ 'variables' => array('style' => NULL),
+ ),
+ 'mark' => array(
+ 'variables' => array('type' => MARK_NEW),
+ ),
+ 'item_list' => array(
+ 'variables' => array('items' => array(), 'title' => NULL, 'type' => 'ul', 'attributes' => array()),
+ ),
+ 'more_help_link' => array(
+ 'variables' => array('url' => NULL),
+ ),
+ 'feed_icon' => array(
+ 'variables' => array('url' => NULL, 'title' => NULL),
+ ),
+ 'more_link' => array(
+ 'variables' => array('url' => NULL, 'title' => NULL)
+ ),
+ 'username' => array(
+ 'variables' => array('account' => NULL),
+ ),
+ 'progress_bar' => array(
+ 'variables' => array('percent' => NULL, 'message' => NULL),
+ ),
+ 'indentation' => array(
+ 'variables' => array('size' => 1),
+ ),
+ 'html_tag' => array(
+ 'render element' => 'element',
+ ),
+ // From theme.maintenance.inc.
+ 'maintenance_page' => array(
+ 'variables' => array('content' => NULL, 'show_messages' => TRUE),
+ 'template' => 'maintenance-page',
+ ),
+ 'update_page' => array(
+ 'variables' => array('content' => NULL, 'show_messages' => TRUE),
+ ),
+ 'install_page' => array(
+ 'variables' => array('content' => NULL),
+ ),
+ 'task_list' => array(
+ 'variables' => array('items' => NULL, 'active' => NULL),
+ ),
+ 'authorize_message' => array(
+ 'variables' => array('message' => NULL, 'success' => TRUE),
+ ),
+ 'authorize_report' => array(
+ 'variables' => array('messages' => array()),
+ ),
+ // From pager.inc.
+ 'pager' => array(
+ 'variables' => array('tags' => array(), 'element' => 0, 'parameters' => array(), 'quantity' => 9),
+ ),
+ 'pager_first' => array(
+ 'variables' => array('text' => NULL, 'element' => 0, 'parameters' => array()),
+ ),
+ 'pager_previous' => array(
+ 'variables' => array('text' => NULL, 'element' => 0, 'interval' => 1, 'parameters' => array()),
+ ),
+ 'pager_next' => array(
+ 'variables' => array('text' => NULL, 'element' => 0, 'interval' => 1, 'parameters' => array()),
+ ),
+ 'pager_last' => array(
+ 'variables' => array('text' => NULL, 'element' => 0, 'parameters' => array()),
+ ),
+ 'pager_link' => array(
+ 'variables' => array('text' => NULL, 'page_new' => NULL, 'element' => NULL, 'parameters' => array(), 'attributes' => array()),
+ ),
+ // From menu.inc.
+ 'menu_link' => array(
+ 'render element' => 'element',
+ ),
+ 'menu_tree' => array(
+ 'render element' => 'tree',
+ ),
+ 'menu_local_task' => array(
+ 'render element' => 'element',
+ ),
+ 'menu_local_action' => array(
+ 'render element' => 'element',
+ ),
+ 'menu_local_tasks' => array(
+ 'variables' => array('primary' => array(), 'secondary' => array()),
+ ),
+ // From form.inc.
+ 'select' => array(
+ 'render element' => 'element',
+ ),
+ 'fieldset' => array(
+ 'render element' => 'element',
+ ),
+ 'radio' => array(
+ 'render element' => 'element',
+ ),
+ 'radios' => array(
+ 'render element' => 'element',
+ ),
+ 'date' => array(
+ 'render element' => 'element',
+ ),
+ 'exposed_filters' => array(
+ 'render element' => 'form',
+ ),
+ 'checkbox' => array(
+ 'render element' => 'element',
+ ),
+ 'checkboxes' => array(
+ 'render element' => 'element',
+ ),
+ 'button' => array(
+ 'render element' => 'element',
+ ),
+ 'image_button' => array(
+ 'render element' => 'element',
+ ),
+ 'hidden' => array(
+ 'render element' => 'element',
+ ),
+ 'textfield' => array(
+ 'render element' => 'element',
+ ),
+ 'form' => array(
+ 'render element' => 'element',
+ ),
+ 'textarea' => array(
+ 'render element' => 'element',
+ ),
+ 'password' => array(
+ 'render element' => 'element',
+ ),
+ 'file' => array(
+ 'render element' => 'element',
+ ),
+ 'tableselect' => array(
+ 'render element' => 'element',
+ ),
+ 'form_element' => array(
+ 'render element' => 'element',
+ ),
+ 'form_required_marker' => array(
+ 'render element' => 'element',
+ ),
+ 'form_element_label' => array(
+ 'render element' => 'element',
+ ),
+ 'vertical_tabs' => array(
+ 'render element' => 'element',
+ ),
+ 'container' => array(
+ 'render element' => 'element',
+ ),
+ );
+}
+
+/**
+ * @addtogroup schemaapi
+ * @{
+ */
+
+/**
+ * Creates all tables defined in a module's hook_schema().
+ *
+ * Note: This function does not pass the module's schema through
+ * hook_schema_alter(). The module's tables will be created exactly as the
+ * module defines them.
+ *
+ * @param $module
+ * The module for which the tables will be created.
+ */
+function drupal_install_schema($module) {
+ $schema = drupal_get_schema_unprocessed($module);
+ _drupal_schema_initialize($schema, $module, FALSE);
+
+ foreach ($schema as $name => $table) {
+ db_create_table($name, $table);
+ }
+}
+
+/**
+ * Removes all tables defined in a module's hook_schema().
+ *
+ * Note: This function does not pass the module's schema through
+ * hook_schema_alter(). The module's tables will be created exactly as the
+ * module defines them.
+ *
+ * @param $module
+ * The module for which the tables will be removed.
+ *
+ * @return
+ * An array of arrays with the following key/value pairs:
+ * - success: a boolean indicating whether the query succeeded.
+ * - query: the SQL query(s) executed, passed through check_plain().
+ */
+function drupal_uninstall_schema($module) {
+ $schema = drupal_get_schema_unprocessed($module);
+ _drupal_schema_initialize($schema, $module, FALSE);
+
+ foreach ($schema as $table) {
+ if (db_table_exists($table['name'])) {
+ db_drop_table($table['name']);
+ }
+ }
+}
+
+/**
+ * Returns the unprocessed and unaltered version of a module's schema.
+ *
+ * Use this function only if you explicitly need the original
+ * specification of a schema, as it was defined in a module's
+ * hook_schema(). No additional default values will be set,
+ * hook_schema_alter() is not invoked and these unprocessed
+ * definitions won't be cached.
+ *
+ * This function can be used to retrieve a schema specification in
+ * hook_schema(), so it allows you to derive your tables from existing
+ * specifications.
+ *
+ * It is also used by drupal_install_schema() and
+ * drupal_uninstall_schema() to ensure that a module's tables are
+ * created exactly as specified without any changes introduced by a
+ * module that implements hook_schema_alter().
+ *
+ * @param $module
+ * The module to which the table belongs.
+ * @param $table
+ * The name of the table. If not given, the module's complete schema
+ * is returned.
+ */
+function drupal_get_schema_unprocessed($module, $table = NULL) {
+ // Load the .install file to get hook_schema.
+ module_load_install($module);
+ $schema = module_invoke($module, 'schema');
+
+ if (isset($table) && isset($schema[$table])) {
+ return $schema[$table];
+ }
+ elseif (!empty($schema)) {
+ return $schema;
+ }
+ return array();
+}
+
+/**
+ * Fills in required default values for table definitions from hook_schema().
+ *
+ * @param $schema
+ * The schema definition array as it was returned by the module's
+ * hook_schema().
+ * @param $module
+ * The module for which hook_schema() was invoked.
+ * @param $remove_descriptions
+ * (optional) Whether to additionally remove 'description' keys of all tables
+ * and fields to improve performance of serialize() and unserialize().
+ * Defaults to TRUE.
+ */
+function _drupal_schema_initialize(&$schema, $module, $remove_descriptions = TRUE) {
+ // Set the name and module key for all tables.
+ foreach ($schema as $name => &$table) {
+ if (empty($table['module'])) {
+ $table['module'] = $module;
+ }
+ if (!isset($table['name'])) {
+ $table['name'] = $name;
+ }
+ if ($remove_descriptions) {
+ unset($table['description']);
+ foreach ($table['fields'] as &$field) {
+ unset($field['description']);
+ }
+ }
+ }
+}
+
+/**
+ * Retrieves a list of fields from a table schema.
+ *
+ * The returned list is suitable for use in an SQL query.
+ *
+ * @param $table
+ * The name of the table from which to retrieve fields.
+ * @param
+ * An optional prefix to to all fields.
+ *
+ * @return An array of fields.
+ */
+function drupal_schema_fields_sql($table, $prefix = NULL) {
+ $schema = drupal_get_schema($table);
+ $fields = array_keys($schema['fields']);
+ if ($prefix) {
+ $columns = array();
+ foreach ($fields as $field) {
+ $columns[] = "$prefix.$field";
+ }
+ return $columns;
+ }
+ else {
+ return $fields;
+ }
+}
+
+/**
+ * Saves (inserts or updates) a record to the database based upon the schema.
+ *
+ * Do not use drupal_write_record() within hook_update_N() functions, since the
+ * database schema cannot be relied upon when a user is running a series of
+ * updates. Instead, use db_insert() or db_update() to save the record.
+ *
+ * @param $table
+ * The name of the table; this must be defined by a hook_schema()
+ * implementation.
+ * @param $record
+ * An object or array representing the record to write, passed in by
+ * reference. If inserting a new record, values not provided in $record will
+ * be populated in $record and in the database with the default values from
+ * the schema, as well as a single serial (auto-increment) field (if present).
+ * If updating an existing record, only provided values are updated in the
+ * database, and $record is not modified.
+ * @param $primary_keys
+ * To indicate that this is a new record to be inserted, omit this argument.
+ * If this is an update, this argument specifies the primary keys' field
+ * names. If there is only 1 field in the key, you may pass in a string; if
+ * there are multiple fields in the key, pass in an array.
+ *
+ * @return
+ * If the record insert or update failed, returns FALSE. If it succeeded,
+ * returns SAVED_NEW or SAVED_UPDATED, depending on the operation performed.
+ */
+function drupal_write_record($table, &$record, $primary_keys = array()) {
+ // Standardize $primary_keys to an array.
+ if (is_string($primary_keys)) {
+ $primary_keys = array($primary_keys);
+ }
+
+ $schema = drupal_get_schema($table);
+ if (empty($schema)) {
+ return FALSE;
+ }
+
+ $object = (object) $record;
+ $fields = array();
+
+ // Go through the schema to determine fields to write.
+ foreach ($schema['fields'] as $field => $info) {
+ if ($info['type'] == 'serial') {
+ // Skip serial types if we are updating.
+ if (!empty($primary_keys)) {
+ continue;
+ }
+ // Track serial field so we can helpfully populate them after the query.
+ // NOTE: Each table should come with one serial field only.
+ $serial = $field;
+ }
+
+ // Skip field if it is in $primary_keys as it is unnecessary to update a
+ // field to the value it is already set to.
+ if (in_array($field, $primary_keys)) {
+ continue;
+ }
+
+ if (!property_exists($object, $field)) {
+ // Skip fields that are not provided, default values are already known
+ // by the database.
+ continue;
+ }
+
+ // Build array of fields to update or insert.
+ if (empty($info['serialize'])) {
+ $fields[$field] = $object->$field;
+ }
+ else {
+ $fields[$field] = serialize($object->$field);
+ }
+
+ // Type cast to proper datatype, except when the value is NULL and the
+ // column allows this.
+ //
+ // MySQL PDO silently casts e.g. FALSE and '' to 0 when inserting the value
+ // into an integer column, but PostgreSQL PDO does not. Also type cast NULL
+ // when the column does not allow this.
+ if (isset($object->$field) || !empty($info['not null'])) {
+ if ($info['type'] == 'int' || $info['type'] == 'serial') {
+ $fields[$field] = (int) $fields[$field];
+ }
+ elseif ($info['type'] == 'float') {
+ $fields[$field] = (float) $fields[$field];
+ }
+ else {
+ $fields[$field] = (string) $fields[$field];
+ }
+ }
+ }
+
+ if (empty($fields)) {
+ return;
+ }
+
+ // Build the SQL.
+ if (empty($primary_keys)) {
+ // We are doing an insert.
+ $options = array('return' => Database::RETURN_INSERT_ID);
+ if (isset($serial) && isset($fields[$serial])) {
+ // If the serial column has been explicitly set with an ID, then we don't
+ // require the database to return the last insert id.
+ if ($fields[$serial]) {
+ $options['return'] = Database::RETURN_AFFECTED;
+ }
+ // If a serial column does exist with no value (i.e. 0) then remove it as
+ // the database will insert the correct value for us.
+ else {
+ unset($fields[$serial]);
+ }
+ }
+ $query = db_insert($table, $options)->fields($fields);
+ $return = SAVED_NEW;
+ }
+ else {
+ $query = db_update($table)->fields($fields);
+ foreach ($primary_keys as $key) {
+ $query->condition($key, $object->$key);
+ }
+ $return = SAVED_UPDATED;
+ }
+
+ // Execute the SQL.
+ if ($query_return = $query->execute()) {
+ if (isset($serial)) {
+ // If the database was not told to return the last insert id, it will be
+ // because we already know it.
+ if (isset($options) && $options['return'] != Database::RETURN_INSERT_ID) {
+ $object->$serial = $fields[$serial];
+ }
+ else {
+ $object->$serial = $query_return;
+ }
+ }
+ }
+ // If we have a single-field primary key but got no insert ID, the
+ // query failed. Note that we explicitly check for FALSE, because
+ // a valid update query which doesn't change any values will return
+ // zero (0) affected rows.
+ elseif ($query_return === FALSE && count($primary_keys) == 1) {
+ $return = FALSE;
+ }
+
+ // If we are inserting, populate empty fields with default values.
+ if (empty($primary_keys)) {
+ foreach ($schema['fields'] as $field => $info) {
+ if (isset($info['default']) && !property_exists($object, $field)) {
+ $object->$field = $info['default'];
+ }
+ }
+ }
+
+ // If we began with an array, convert back.
+ if (is_array($record)) {
+ $record = (array) $object;
+ }
+
+ return $return;
+}
+
+/**
+ * @} End of "addtogroup schemaapi".
+ */
+
+/**
+ * Parses Drupal module and theme .info files.
+ *
+ * Info files are NOT for placing arbitrary theme and module-specific settings.
+ * Use variable_get() and variable_set() for that.
+ *
+ * Information stored in a module .info file:
+ * - name: The real name of the module for display purposes.
+ * - description: A brief description of the module.
+ * - dependencies: An array of shortnames of other modules this module requires.
+ * - package: The name of the package of modules this module belongs to.
+ *
+ * See forum.info for an example of a module .info file.
+ *
+ * Information stored in a theme .info file:
+ * - name: The real name of the theme for display purposes.
+ * - description: Brief description.
+ * - screenshot: Path to screenshot relative to the theme's .info file.
+ * - engine: Theme engine; typically phptemplate.
+ * - base: Name of a base theme, if applicable; e.g., base = zen.
+ * - regions: Listed regions; e.g., region[left] = Left sidebar.
+ * - features: Features available; e.g., features[] = logo.
+ * - stylesheets: Theme stylesheets; e.g., stylesheets[all][] = my-style.css.
+ * - scripts: Theme scripts; e.g., scripts[] = my-script.js.
+ *
+ * See bartik.info for an example of a theme .info file.
+ *
+ * @param $filename
+ * The file we are parsing. Accepts file with relative or absolute path.
+ *
+ * @return
+ * The info array.
+ *
+ * @see drupal_parse_info_format()
+ */
+function drupal_parse_info_file($filename) {
+ $info = &drupal_static(__FUNCTION__, array());
+
+ if (!isset($info[$filename])) {
+ if (!file_exists($filename)) {
+ $info[$filename] = array();
+ }
+ else {
+ $data = file_get_contents($filename);
+ $info[$filename] = drupal_parse_info_format($data);
+ }
+ }
+ return $info[$filename];
+}
+
+/**
+ * Parses data in Drupal's .info format.
+ *
+ * Data should be in an .ini-like format to specify values. White-space
+ * generally doesn't matter, except inside values:
+ * @code
+ * key = value
+ * key = "value"
+ * key = 'value'
+ * key = "multi-line
+ * value"
+ * key = 'multi-line
+ * value'
+ * key
+ * =
+ * 'value'
+ * @endcode
+ *
+ * Arrays are created using a HTTP GET alike syntax:
+ * @code
+ * key[] = "numeric array"
+ * key[index] = "associative array"
+ * key[index][] = "nested numeric array"
+ * key[index][index] = "nested associative array"
+ * @endcode
+ *
+ * PHP constants are substituted in, but only when used as the entire value.
+ * Comments should start with a semi-colon at the beginning of a line.
+ *
+ * @param $data
+ * A string to parse.
+ *
+ * @return
+ * The info array.
+ *
+ * @see drupal_parse_info_file()
+ */
+function drupal_parse_info_format($data) {
+ $info = array();
+ $constants = get_defined_constants();
+
+ if (preg_match_all('
+ @^\s* # Start at the beginning of a line, ignoring leading whitespace
+ ((?:
+ [^=;\[\]]| # Key names cannot contain equal signs, semi-colons or square brackets,
+ \[[^\[\]]*\] # unless they are balanced and not nested
+ )+?)
+ \s*=\s* # Key/value pairs are separated by equal signs (ignoring white-space)
+ (?:
+ ("(?:[^"]|(?<=\\\\)")*")| # Double-quoted string, which may contain slash-escaped quotes/slashes
+ (\'(?:[^\']|(?<=\\\\)\')*\')| # Single-quoted string, which may contain slash-escaped quotes/slashes
+ ([^\r\n]*?) # Non-quoted string
+ )\s*$ # Stop at the next end of a line, ignoring trailing whitespace
+ @msx', $data, $matches, PREG_SET_ORDER)) {
+ foreach ($matches as $match) {
+ // Fetch the key and value string.
+ $i = 0;
+ foreach (array('key', 'value1', 'value2', 'value3') as $var) {
+ $$var = isset($match[++$i]) ? $match[$i] : '';
+ }
+ $value = stripslashes(substr($value1, 1, -1)) . stripslashes(substr($value2, 1, -1)) . $value3;
+
+ // Parse array syntax.
+ $keys = preg_split('/\]?\[/', rtrim($key, ']'));
+ $last = array_pop($keys);
+ $parent = &$info;
+
+ // Create nested arrays.
+ foreach ($keys as $key) {
+ if ($key == '') {
+ $key = count($parent);
+ }
+ if (!isset($parent[$key]) || !is_array($parent[$key])) {
+ $parent[$key] = array();
+ }
+ $parent = &$parent[$key];
+ }
+
+ // Handle PHP constants.
+ if (isset($constants[$value])) {
+ $value = $constants[$value];
+ }
+
+ // Insert actual value.
+ if ($last == '') {
+ $last = count($parent);
+ }
+ $parent[$last] = $value;
+ }
+ }
+
+ return $info;
+}
+
+/**
+ * Returns a list of severity levels, as defined in RFC 3164.
+ *
+ * @return
+ * Array of the possible severity levels for log messages.
+ *
+ * @see http://www.ietf.org/rfc/rfc3164.txt
+ * @see watchdog()
+ * @ingroup logging_severity_levels
+ */
+function watchdog_severity_levels() {
+ return array(
+ WATCHDOG_EMERGENCY => t('emergency'),
+ WATCHDOG_ALERT => t('alert'),
+ WATCHDOG_CRITICAL => t('critical'),
+ WATCHDOG_ERROR => t('error'),
+ WATCHDOG_WARNING => t('warning'),
+ WATCHDOG_NOTICE => t('notice'),
+ WATCHDOG_INFO => t('info'),
+ WATCHDOG_DEBUG => t('debug'),
+ );
+}
+
+
+/**
+ * Explodes a string of tags into an array.
+ *
+ * @see drupal_implode_tags()
+ */
+function drupal_explode_tags($tags) {
+ // This regexp allows the following types of user input:
+ // this, "somecompany, llc", "and ""this"" w,o.rks", foo bar
+ $regexp = '%(?:^|,\ *)("(?>[^"]*)(?>""[^"]* )*"|(?: [^",]*))%x';
+ preg_match_all($regexp, $tags, $matches);
+ $typed_tags = array_unique($matches[1]);
+
+ $tags = array();
+ foreach ($typed_tags as $tag) {
+ // If a user has escaped a term (to demonstrate that it is a group,
+ // or includes a comma or quote character), we remove the escape
+ // formatting so to save the term into the database as the user intends.
+ $tag = trim(str_replace('""', '"', preg_replace('/^"(.*)"$/', '\1', $tag)));
+ if ($tag != "") {
+ $tags[] = $tag;
+ }
+ }
+
+ return $tags;
+}
+
+/**
+ * Implodes an array of tags into a string.
+ *
+ * @see drupal_explode_tags()
+ */
+function drupal_implode_tags($tags) {
+ $encoded_tags = array();
+ foreach ($tags as $tag) {
+ // Commas and quotes in tag names are special cases, so encode them.
+ if (strpos($tag, ',') !== FALSE || strpos($tag, '"') !== FALSE) {
+ $tag = '"' . str_replace('"', '""', $tag) . '"';
+ }
+
+ $encoded_tags[] = $tag;
+ }
+ return implode(', ', $encoded_tags);
+}
+
+/**
+ * Flushes all cached data on the site.
+ *
+ * Empties cache tables, rebuilds the menu cache and theme registries, and
+ * invokes a hook so that other modules' cache data can be cleared as well.
+ */
+function drupal_flush_all_caches() {
+ // Change query-strings on css/js files to enforce reload for all users.
+ _drupal_flush_css_js();
+
+ registry_rebuild();
+ drupal_clear_css_cache();
+ drupal_clear_js_cache();
+
+ // Rebuild the theme data. Note that the module data is rebuilt above, as
+ // part of registry_rebuild().
+ system_rebuild_theme_data();
+ drupal_theme_rebuild();
+
+ entity_info_cache_clear();
+ node_types_rebuild();
+ // node_menu() defines menu items based on node types so it needs to come
+ // after node types are rebuilt.
+ menu_rebuild();
+
+ // Synchronize to catch any actions that were added or removed.
+ actions_synchronize();
+
+ // Don't clear cache_form - in-progress form submissions may break.
+ // Ordered so clearing the page cache will always be the last action.
+ $core = array('cache', 'cache_path', 'cache_filter', 'cache_bootstrap', 'cache_page');
+ $cache_tables = array_merge(module_invoke_all('flush_caches'), $core);
+ foreach ($cache_tables as $table) {
+ cache_clear_all('*', $table, TRUE);
+ }
+
+ // Rebuild the bootstrap module list. We do this here so that developers
+ // can get new hook_boot() implementations registered without having to
+ // write a hook_update_N() function.
+ _system_update_bootstrap_status();
+}
+
+/**
+ * Changes the dummy query string added to all CSS and JavaScript files.
+ *
+ * Changing the dummy query string appended to CSS and JavaScript files forces
+ * all browsers to reload fresh files.
+ */
+function _drupal_flush_css_js() {
+ // The timestamp is converted to base 36 in order to make it more compact.
+ variable_set('css_js_query_string', base_convert(REQUEST_TIME, 10, 36));
+}
+
+/**
+ * Outputs debug information.
+ *
+ * The debug information is passed on to trigger_error() after being converted
+ * to a string using _drupal_debug_message().
+ *
+ * @param $data
+ * Data to be output.
+ * @param $label
+ * Label to prefix the data.
+ * @param $print_r
+ * Flag to switch between print_r() and var_export() for data conversion to
+ * string. Set $print_r to TRUE when dealing with a recursive data structure
+ * as var_export() will generate an error.
+ */
+function debug($data, $label = NULL, $print_r = FALSE) {
+ // Print $data contents to string.
+ $string = check_plain($print_r ? print_r($data, TRUE) : var_export($data, TRUE));
+
+ // Display values with pre-formatting to increase readability.
+ $string = '<pre>' . $string . '</pre>';
+
+ trigger_error(trim($label ? "$label: $string" : $string));
+}
+
+/**
+ * Parses a dependency for comparison by drupal_check_incompatibility().
+ *
+ * @param $dependency
+ * A dependency string, for example 'foo (>=7.x-4.5-beta5, 3.x)'.
+ *
+ * @return
+ * An associative array with three keys:
+ * - 'name' includes the name of the thing to depend on (e.g. 'foo').
+ * - 'original_version' contains the original version string (which can be
+ * used in the UI for reporting incompatibilities).
+ * - 'versions' is a list of associative arrays, each containing the keys
+ * 'op' and 'version'. 'op' can be one of: '=', '==', '!=', '<>', '<',
+ * '<=', '>', or '>='. 'version' is one piece like '4.5-beta3'.
+ * Callers should pass this structure to drupal_check_incompatibility().
+ *
+ * @see drupal_check_incompatibility()
+ */
+function drupal_parse_dependency($dependency) {
+ // We use named subpatterns and support every op that version_compare
+ // supports. Also, op is optional and defaults to equals.
+ $p_op = '(?P<operation>!=|==|=|<|<=|>|>=|<>)?';
+ // Core version is always optional: 7.x-2.x and 2.x is treated the same.
+ $p_core = '(?:' . preg_quote(DRUPAL_CORE_COMPATIBILITY) . '-)?';
+ $p_major = '(?P<major>\d+)';
+ // By setting the minor version to x, branches can be matched.
+ $p_minor = '(?P<minor>(?:\d+|x)(?:-[A-Za-z]+\d+)?)';
+ $value = array();
+ $parts = explode('(', $dependency, 2);
+ $value['name'] = trim($parts[0]);
+ if (isset($parts[1])) {
+ $value['original_version'] = ' (' . $parts[1];
+ foreach (explode(',', $parts[1]) as $version) {
+ if (preg_match("/^\s*$p_op\s*$p_core$p_major\.$p_minor/", $version, $matches)) {
+ $op = !empty($matches['operation']) ? $matches['operation'] : '=';
+ if ($matches['minor'] == 'x') {
+ // Drupal considers "2.x" to mean any version that begins with
+ // "2" (e.g. 2.0, 2.9 are all "2.x"). PHP's version_compare(),
+ // on the other hand, treats "x" as a string; so to
+ // version_compare(), "2.x" is considered less than 2.0. This
+ // means that >=2.x and <2.x are handled by version_compare()
+ // as we need, but > and <= are not.
+ if ($op == '>' || $op == '<=') {
+ $matches['major']++;
+ }
+ // Equivalence can be checked by adding two restrictions.
+ if ($op == '=' || $op == '==') {
+ $value['versions'][] = array('op' => '<', 'version' => ($matches['major'] + 1) . '.x');
+ $op = '>=';
+ }
+ }
+ $value['versions'][] = array('op' => $op, 'version' => $matches['major'] . '.' . $matches['minor']);
+ }
+ }
+ }
+ return $value;
+}
+
+/**
+ * Checks whether a version is compatible with a given dependency.
+ *
+ * @param $v
+ * The parsed dependency structure from drupal_parse_dependency().
+ * @param $current_version
+ * The version to check against (like 4.2).
+ *
+ * @return
+ * NULL if compatible, otherwise the original dependency version string that
+ * caused the incompatibility.
+ *
+ * @see drupal_parse_dependency()
+ */
+function drupal_check_incompatibility($v, $current_version) {
+ if (!empty($v['versions'])) {
+ foreach ($v['versions'] as $required_version) {
+ if ((isset($required_version['op']) && !version_compare($current_version, $required_version['version'], $required_version['op']))) {
+ return $v['original_version'];
+ }
+ }
+ }
+}
+
+/**
+ * Get the entity info array of an entity type.
+ *
+ * @param $entity_type
+ * The entity type, e.g. node, for which the info shall be returned, or NULL
+ * to return an array with info about all types.
+ *
+ * @see hook_entity_info()
+ * @see hook_entity_info_alter()
+ */
+function entity_get_info($entity_type = 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['entity_info'] = &drupal_static(__FUNCTION__);
+ }
+ $entity_info = &$drupal_static_fast['entity_info'];
+
+ // hook_entity_info() includes translated strings, so each language is cached
+ // separately.
+ $langcode = $language->language;
+
+ if (empty($entity_info)) {
+ if ($cache = cache_get("entity_info:$langcode")) {
+ $entity_info = $cache->data;
+ }
+ else {
+ $entity_info = module_invoke_all('entity_info');
+ // Merge in default values.
+ foreach ($entity_info as $name => $data) {
+ $entity_info[$name] += array(
+ 'fieldable' => FALSE,
+ 'controller class' => 'DrupalDefaultEntityController',
+ 'static cache' => TRUE,
+ 'field cache' => TRUE,
+ 'load hook' => $name . '_load',
+ 'bundles' => array(),
+ 'view modes' => array(),
+ 'entity keys' => array(),
+ 'translation' => array(),
+ );
+ $entity_info[$name]['entity keys'] += array(
+ 'revision' => '',
+ 'bundle' => '',
+ );
+ foreach ($entity_info[$name]['view modes'] as $view_mode => $view_mode_info) {
+ $entity_info[$name]['view modes'][$view_mode] += array(
+ 'custom settings' => FALSE,
+ );
+ }
+ // If no bundle key is provided, assume a single bundle, named after
+ // the entity type.
+ if (empty($entity_info[$name]['entity keys']['bundle']) && empty($entity_info[$name]['bundles'])) {
+ $entity_info[$name]['bundles'] = array($name => array('label' => $entity_info[$name]['label']));
+ }
+ // Prepare entity schema fields SQL info for
+ // DrupalEntityControllerInterface::buildQuery().
+ if (isset($entity_info[$name]['base table'])) {
+ $entity_info[$name]['schema_fields_sql']['base table'] = drupal_schema_fields_sql($entity_info[$name]['base table']);
+ if (isset($entity_info[$name]['revision table'])) {
+ $entity_info[$name]['schema_fields_sql']['revision table'] = drupal_schema_fields_sql($entity_info[$name]['revision table']);
+ }
+ }
+ }
+ // Let other modules alter the entity info.
+ drupal_alter('entity_info', $entity_info);
+ cache_set("entity_info:$langcode", $entity_info);
+ }
+ }
+
+ if (empty($entity_type)) {
+ return $entity_info;
+ }
+ elseif (isset($entity_info[$entity_type])) {
+ return $entity_info[$entity_type];
+ }
+}
+
+/**
+ * Resets the cached information about entity types.
+ */
+function entity_info_cache_clear() {
+ drupal_static_reset('entity_get_info');
+ // Clear all languages.
+ cache_clear_all('entity_info:', 'cache', TRUE);
+}
+
+/**
+ * Helper function to extract id, vid, and bundle name from an entity.
+ *
+ * @param $entity_type
+ * The entity type; e.g. 'node' or 'user'.
+ * @param $entity
+ * The entity from which to extract values.
+ *
+ * @return
+ * A numerically indexed array (not a hash table) containing these
+ * elements:
+ * - 0: Primary ID of the entity.
+ * - 1: Revision ID of the entity, or NULL if $entity_type is not versioned.
+ * - 2: Bundle name of the entity, or NULL if $entity_type has no bundles.
+ */
+function entity_extract_ids($entity_type, $entity) {
+ $info = entity_get_info($entity_type);
+
+ // Objects being created might not have id/vid yet.
+ $id = isset($entity->{$info['entity keys']['id']}) ? $entity->{$info['entity keys']['id']} : NULL;
+ $vid = ($info['entity keys']['revision'] && isset($entity->{$info['entity keys']['revision']})) ? $entity->{$info['entity keys']['revision']} : NULL;
+
+ if (!empty($info['entity keys']['bundle'])) {
+ // Explicitly fail for malformed entities missing the bundle property.
+ if (!isset($entity->{$info['entity keys']['bundle']}) || $entity->{$info['entity keys']['bundle']} === '') {
+ throw new EntityMalformedException(t('Missing bundle property on entity of type @entity_type.', array('@entity_type' => $entity_type)));
+ }
+ $bundle = $entity->{$info['entity keys']['bundle']};
+ }
+ else {
+ // The entity type provides no bundle key: assume a single bundle, named
+ // after the entity type.
+ $bundle = $entity_type;
+ }
+
+ return array($id, $vid, $bundle);
+}
+
+/**
+ * Helper function to assemble an object structure with initial ids.
+ *
+ * This function can be seen as reciprocal to entity_extract_ids().
+ *
+ * @param $entity_type
+ * The entity type; e.g. 'node' or 'user'.
+ * @param $ids
+ * A numerically indexed array, as returned by entity_extract_ids().
+ *
+ * @return
+ * An entity structure, initialized with the ids provided.
+ *
+ * @see entity_extract_ids()
+ */
+function entity_create_stub_entity($entity_type, $ids) {
+ $entity = new stdClass();
+ $info = entity_get_info($entity_type);
+ $entity->{$info['entity keys']['id']} = $ids[0];
+ if (!empty($info['entity keys']['revision']) && isset($ids[1])) {
+ $entity->{$info['entity keys']['revision']} = $ids[1];
+ }
+ if (!empty($info['entity keys']['bundle']) && isset($ids[2])) {
+ $entity->{$info['entity keys']['bundle']} = $ids[2];
+ }
+ return $entity;
+}
+
+/**
+ * Load entities from the database.
+ *
+ * The entities are stored in a static memory cache, and will not require
+ * database access if loaded again during the same page request.
+ *
+ * The actual loading is done through a class that has to implement the
+ * DrupalEntityControllerInterface interface. By default,
+ * DrupalDefaultEntityController is used. Entity types can specify that a
+ * different class should be used by setting the 'controller class' key in
+ * hook_entity_info(). These classes can either implement the
+ * DrupalEntityControllerInterface interface, or, most commonly, extend the
+ * DrupalDefaultEntityController class. See node_entity_info() and the
+ * NodeController in node.module as an example.
+ *
+ * @param $entity_type
+ * The entity type to load, e.g. node or user.
+ * @param $ids
+ * An array of entity IDs, or FALSE to load all entities.
+ * @param $conditions
+ * (deprecated) An associative array of conditions on the base table, where
+ * the keys are the database fields and the values are the values those
+ * fields must have. Instead, it is preferable to use EntityFieldQuery to
+ * retrieve a list of entity IDs loadable by this function.
+ * @param $reset
+ * Whether to reset the internal cache for the requested entity type.
+ *
+ * @return
+ * An array of entity objects indexed by their ids. When no results are
+ * found, an empty array is returned.
+ *
+ * @todo Remove $conditions in Drupal 8.
+ *
+ * @see hook_entity_info()
+ * @see DrupalEntityControllerInterface
+ * @see DrupalDefaultEntityController
+ * @see EntityFieldQuery
+ */
+function entity_load($entity_type, $ids = FALSE, $conditions = array(), $reset = FALSE) {
+ if ($reset) {
+ entity_get_controller($entity_type)->resetCache();
+ }
+ return entity_get_controller($entity_type)->load($ids, $conditions);
+}
+
+/**
+ * Loads the unchanged, i.e. not modified, entity from the database.
+ *
+ * Unlike entity_load() this function ensures the entity is directly loaded from
+ * the database, thus bypassing any static cache. In particular, this function
+ * is useful to determine changes by comparing the entity being saved to the
+ * stored entity.
+ *
+ * @param $entity_type
+ * The entity type to load, e.g. node or user.
+ * @param $id
+ * The ID of the entity to load.
+ *
+ * @return
+ * The unchanged entity, or FALSE if the entity cannot be loaded.
+ */
+function entity_load_unchanged($entity_type, $id) {
+ entity_get_controller($entity_type)->resetCache(array($id));
+ $result = entity_get_controller($entity_type)->load(array($id));
+ return reset($result);
+}
+
+/**
+ * Get the entity controller class for an entity type.
+ */
+function entity_get_controller($entity_type) {
+ $controllers = &drupal_static(__FUNCTION__, array());
+ if (!isset($controllers[$entity_type])) {
+ $type_info = entity_get_info($entity_type);
+ $class = $type_info['controller class'];
+ $controllers[$entity_type] = new $class($entity_type);
+ }
+ return $controllers[$entity_type];
+}
+
+/**
+ * Invoke hook_entity_prepare_view().
+ *
+ * If adding a new entity similar to nodes, comments or users, you should
+ * invoke this function during the ENTITY_build_content() or
+ * ENTITY_view_multiple() phases of rendering to allow other modules to alter
+ * the objects during this phase. This is needed for situations where
+ * information needs to be loaded outside of ENTITY_load() - particularly
+ * when loading entities into one another - i.e. a user object into a node, due
+ * to the potential for unwanted side-effects such as caching and infinite
+ * recursion. By convention, entity_prepare_view() is called after
+ * field_attach_prepare_view() to allow entity level hooks to act on content
+ * loaded by field API.
+ *
+ * @param $entity_type
+ * The type of entity, i.e. 'node', 'user'.
+ * @param $entities
+ * The entity objects which are being prepared for view, keyed by object ID.
+ * @param $langcode
+ * (optional) A language code to be used for rendering. Defaults to the global
+ * content language of the current request.
+ *
+ * @see hook_entity_prepare_view()
+ */
+function entity_prepare_view($entity_type, $entities, $langcode = NULL) {
+ if (!isset($langcode)) {
+ $langcode = $GLOBALS['language_content']->language;
+ }
+
+ // To ensure hooks are only run once per entity, check for an
+ // entity_view_prepared flag and only process items without it.
+ // @todo: resolve this more generally for both entity and field level hooks.
+ $prepare = array();
+ foreach ($entities as $id => $entity) {
+ if (empty($entity->entity_view_prepared)) {
+ // Add this entity to the items to be prepared.
+ $prepare[$id] = $entity;
+
+ // Mark this item as prepared.
+ $entity->entity_view_prepared = TRUE;
+ }
+ }
+
+ if (!empty($prepare)) {
+ module_invoke_all('entity_prepare_view', $prepare, $entity_type, $langcode);
+ }
+}
+
+/**
+ * Returns the URI elements of an entity.
+ *
+ * @param $entity_type
+ * The entity type; e.g. 'node' or 'user'.
+ * @param $entity
+ * The entity for which to generate a path.
+ * @return
+ * An array containing the 'path' and 'options' keys used to build the URI of
+ * the entity, and matching the signature of url(). NULL if the entity has no
+ * URI of its own.
+ */
+function entity_uri($entity_type, $entity) {
+ $info = entity_get_info($entity_type);
+ list($id, $vid, $bundle) = entity_extract_ids($entity_type, $entity);
+
+ // A bundle-specific callback takes precedence over the generic one for the
+ // entity type.
+ if (isset($info['bundles'][$bundle]['uri callback'])) {
+ $uri_callback = $info['bundles'][$bundle]['uri callback'];
+ }
+ elseif (isset($info['uri callback'])) {
+ $uri_callback = $info['uri callback'];
+ }
+ else {
+ return NULL;
+ }
+
+ // Invoke the callback to get the URI. If there is no callback, return NULL.
+ if (isset($uri_callback) && function_exists($uri_callback)) {
+ $uri = $uri_callback($entity);
+ // Pass the entity data to url() so that alter functions do not need to
+ // lookup this entity again.
+ $uri['options']['entity_type'] = $entity_type;
+ $uri['options']['entity'] = $entity;
+ return $uri;
+ }
+}
+
+/**
+ * Returns the label of an entity.
+ *
+ * See the 'label callback' component of the hook_entity_info() return value
+ * for more information.
+ *
+ * @param $entity_type
+ * The entity type; e.g., 'node' or 'user'.
+ * @param $entity
+ * The entity for which to generate the label.
+ *
+ * @return
+ * The entity label, or FALSE if not found.
+ */
+function entity_label($entity_type, $entity) {
+ $label = FALSE;
+ $info = entity_get_info($entity_type);
+ if (isset($info['label callback']) && function_exists($info['label callback'])) {
+ $label = $info['label callback']($entity, $entity_type);
+ }
+ elseif (!empty($info['entity keys']['label']) && isset($entity->{$info['entity keys']['label']})) {
+ $label = $entity->{$info['entity keys']['label']};
+ }
+
+ return $label;
+}
+
+/**
+ * Returns the language of an entity.
+ *
+ * @param $entity_type
+ * The entity type; e.g., 'node' or 'user'.
+ * @param $entity
+ * The entity for which to get the language.
+ *
+ * @return
+ * A valid language code or NULL if the entity has no language support.
+ */
+function entity_language($entity_type, $entity) {
+ $info = entity_get_info($entity_type);
+
+ // Invoke the callback to get the language. If there is no callback, try to
+ // get it from a property of the entity, otherwise NULL.
+ if (isset($info['language callback']) && function_exists($info['language callback'])) {
+ $langcode = $info['language callback']($entity_type, $entity);
+ }
+ elseif (!empty($info['entity keys']['language']) && isset($entity->{$info['entity keys']['language']})) {
+ $langcode = $entity->{$info['entity keys']['language']};
+ }
+ else {
+ // The value returned in D8 would be LANGUAGE_NONE, we cannot use it here to
+ // preserve backward compatibility. In fact this function has been
+ // introduced very late in the D7 life cycle, mainly as the proper default
+ // for field_attach_form(). By returning LANGUAGE_NONE when no language
+ // information is available, we would introduce a potentially BC-breaking
+ // API change, since field_attach_form() defaults to the default language
+ // instead of LANGUAGE_NONE. Moreover this allows us to distinguish between
+ // entities that have no language specified from ones that do not have
+ // language support at all.
+ $langcode = NULL;
+ }
+
+ return $langcode;
+}
+
+/**
+ * Attaches field API validation to entity forms.
+ */
+function entity_form_field_validate($entity_type, $form, &$form_state) {
+ // All field attach API functions act on an entity object, but during form
+ // validation, we don't have one. $form_state contains the entity as it was
+ // prior to processing the current form submission, and we must not update it
+ // until we have fully validated the submitted input. Therefore, for
+ // validation, act on a pseudo entity created out of the form values.
+ $pseudo_entity = (object) $form_state['values'];
+ field_attach_form_validate($entity_type, $pseudo_entity, $form, $form_state);
+}
+
+/**
+ * Copies submitted values to entity properties for simple entity forms.
+ *
+ * During the submission handling of an entity form's "Save", "Preview", and
+ * possibly other buttons, the form state's entity needs to be updated with the
+ * submitted form values. Each entity form implements its own builder function
+ * for doing this, appropriate for the particular entity and form, whereas
+ * modules may specify additional builder functions in $form['#entity_builders']
+ * for copying the form values of added form elements to entity properties.
+ * Many of the main entity builder functions can call this helper function to
+ * re-use its logic of copying $form_state['values'][PROPERTY] values to
+ * $entity->PROPERTY for all entries in $form_state['values'] that are not field
+ * data, and calling field_attach_submit() to copy field data. Apart from that
+ * this helper invokes any additional builder functions that have been specified
+ * in $form['#entity_builders'].
+ *
+ * For some entity forms (e.g., forms with complex non-field data and forms that
+ * simultaneously edit multiple entities), this behavior may be inappropriate,
+ * so the builder function for such forms needs to implement the required
+ * functionality instead of calling this function.
+ */
+function entity_form_submit_build_entity($entity_type, $entity, $form, &$form_state) {
+ $info = entity_get_info($entity_type);
+ list(, , $bundle) = entity_extract_ids($entity_type, $entity);
+
+ // Copy top-level form values that are not for fields to entity properties,
+ // without changing existing entity properties that are not being edited by
+ // this form. Copying field values must be done using field_attach_submit().
+ $values_excluding_fields = $info['fieldable'] ? array_diff_key($form_state['values'], field_info_instances($entity_type, $bundle)) : $form_state['values'];
+ foreach ($values_excluding_fields as $key => $value) {
+ $entity->$key = $value;
+ }
+
+ // Invoke all specified builders for copying form values to entity properties.
+ if (isset($form['#entity_builders'])) {
+ foreach ($form['#entity_builders'] as $function) {
+ $function($entity_type, $entity, $form, $form_state);
+ }
+ }
+
+ // Copy field values to the entity.
+ if ($info['fieldable']) {
+ field_attach_submit($entity_type, $entity, $form, $form_state);
+ }
+}
+
+/**
+ * Performs one or more XML-RPC request(s).
+ *
+ * Usage example:
+ * @code
+ * $result = xmlrpc('http://example.com/xmlrpc.php', array(
+ * 'service.methodName' => array($parameter, $second, $third),
+ * ));
+ * @endcode
+ *
+ * @param $url
+ * An absolute URL of the XML-RPC endpoint.
+ * @param $args
+ * An associative array whose keys are the methods to call and whose values
+ * are the arguments to pass to the respective method. If multiple methods
+ * are specified, a system.multicall is performed.
+ * @param $options
+ * (optional) An array of options to pass along to drupal_http_request().
+ *
+ * @return
+ * For one request:
+ * Either the return value of the method on success, or FALSE.
+ * If FALSE is returned, see xmlrpc_errno() and xmlrpc_error_msg().
+ * For multiple requests:
+ * An array of results. Each result will either be the result
+ * returned by the method called, or an xmlrpc_error object if the call
+ * failed. See xmlrpc_error().
+ */
+function xmlrpc($url, $args, $options = array()) {
+ require_once DRUPAL_ROOT . '/includes/xmlrpc.inc';
+ return _xmlrpc($url, $args, $options);
+}
+
+/**
+ * Retrieves a list of all available archivers.
+ *
+ * @see hook_archiver_info()
+ * @see hook_archiver_info_alter()
+ */
+function archiver_get_info() {
+ $archiver_info = &drupal_static(__FUNCTION__, array());
+
+ if (empty($archiver_info)) {
+ $cache = cache_get('archiver_info');
+ if ($cache === FALSE) {
+ // Rebuild the cache and save it.
+ $archiver_info = module_invoke_all('archiver_info');
+ drupal_alter('archiver_info', $archiver_info);
+ uasort($archiver_info, 'drupal_sort_weight');
+ cache_set('archiver_info', $archiver_info);
+ }
+ else {
+ $archiver_info = $cache->data;
+ }
+ }
+
+ return $archiver_info;
+}
+
+/**
+ * Returns a string of supported archive extensions.
+ *
+ * @return
+ * A space-separated string of extensions suitable for use by the file
+ * validation system.
+ */
+function archiver_get_extensions() {
+ $valid_extensions = array();
+ foreach (archiver_get_info() as $archive) {
+ foreach ($archive['extensions'] as $extension) {
+ foreach (explode('.', $extension) as $part) {
+ if (!in_array($part, $valid_extensions)) {
+ $valid_extensions[] = $part;
+ }
+ }
+ }
+ }
+ return implode(' ', $valid_extensions);
+}
+
+/**
+ * Creates the appropriate archiver for the specified file.
+ *
+ * @param $file
+ * The full path of the archive file. Note that stream wrapper paths are
+ * supported, but not remote ones.
+ *
+ * @return
+ * A newly created instance of the archiver class appropriate
+ * for the specified file, already bound to that file.
+ * If no appropriate archiver class was found, will return FALSE.
+ */
+function archiver_get_archiver($file) {
+ // Archivers can only work on local paths
+ $filepath = drupal_realpath($file);
+ if (!is_file($filepath)) {
+ throw new Exception(t('Archivers can only operate on local files: %file not supported', array('%file' => $file)));
+ }
+ $archiver_info = archiver_get_info();
+
+ foreach ($archiver_info as $implementation) {
+ foreach ($implementation['extensions'] as $extension) {
+ // Because extensions may be multi-part, such as .tar.gz,
+ // we cannot use simpler approaches like substr() or pathinfo().
+ // This method isn't quite as clean but gets the job done.
+ // Also note that the file may not yet exist, so we cannot rely
+ // on fileinfo() or other disk-level utilities.
+ if (strrpos($filepath, '.' . $extension) === strlen($filepath) - strlen('.' . $extension)) {
+ return new $implementation['class']($filepath);
+ }
+ }
+ }
+}
+
+/**
+ * Assembles the Drupal Updater registry.
+ *
+ * An Updater is a class that knows how to update various parts of the Drupal
+ * file system, for example to update modules that have newer releases, or to
+ * install a new theme.
+ *
+ * @return
+ * The Drupal Updater class registry.
+ *
+ * @see hook_updater_info()
+ * @see hook_updater_info_alter()
+ */
+function drupal_get_updaters() {
+ $updaters = &drupal_static(__FUNCTION__);
+ if (!isset($updaters)) {
+ $updaters = module_invoke_all('updater_info');
+ drupal_alter('updater_info', $updaters);
+ uasort($updaters, 'drupal_sort_weight');
+ }
+ return $updaters;
+}
+
+/**
+ * Assembles the Drupal FileTransfer registry.
+ *
+ * @return
+ * The Drupal FileTransfer class registry.
+ *
+ * @see FileTransfer
+ * @see hook_filetransfer_info()
+ * @see hook_filetransfer_info_alter()
+ */
+function drupal_get_filetransfer_info() {
+ $info = &drupal_static(__FUNCTION__);
+ if (!isset($info)) {
+ // Since we have to manually set the 'file path' default for each
+ // module separately, we can't use module_invoke_all().
+ $info = array();
+ foreach (module_implements('filetransfer_info') as $module) {
+ $function = $module . '_filetransfer_info';
+ if (function_exists($function)) {
+ $result = $function();
+ if (isset($result) && is_array($result)) {
+ foreach ($result as &$values) {
+ if (empty($values['file path'])) {
+ $values['file path'] = drupal_get_path('module', $module);
+ }
+ }
+ $info = array_merge_recursive($info, $result);
+ }
+ }
+ }
+ drupal_alter('filetransfer_info', $info);
+ uasort($info, 'drupal_sort_weight');
+ }
+ return $info;
+}