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/**
* @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.
*/
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use Drupal\Component\Serialization\Json;
use Drupal\Component\Serialization\Yaml;
use Drupal\Component\Serialization\Exception\InvalidDataTypeException;
use Drupal\Component\Utility\Bytes;
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use Drupal\Component\Utility\Crypt;
use Drupal\Component\Utility\Html;
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use Drupal\Component\Utility\Number;
use Drupal\Component\Utility\SortArray;
use Drupal\Component\Utility\SafeMarkup;
use Drupal\Component\Utility\Tags;
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use Drupal\Component\Utility\UrlHelper;
use Drupal\Core\Asset\AttachedAssets;
use Drupal\Core\Cache\Cache;
use Drupal\Core\Language\LanguageInterface;
use Drupal\Core\Render\SafeString;
use Drupal\Core\Render\Renderer;
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use Drupal\Core\Site\Settings;
use Drupal\Core\StringTranslation\TranslatableString;
use Drupal\Core\Url;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Request;
use Drupal\Core\PhpStorage\PhpStorageFactory;
use Drupal\Component\Utility\NestedArray;
use Drupal\Core\Datetime\DrupalDateTime;
use Drupal\Core\Routing\GeneratorNotInitializedException;
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use Drupal\Core\Template\Attribute;
use Drupal\Core\Render\BubbleableMetadata;
use Drupal\Core\Render\Element;
use Drupal\Core\Session\AnonymousUserSession;
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/**
* @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
* $my_substring = Unicode::substr($original_string, 0, 5);
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* @endcode
*
* @}
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*/
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/**
* Return status for saving which involved creating a new item.
*/
const SAVED_NEW = 1;
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/**
* Return status for saving which involved an update to an existing item.
*/
const SAVED_UPDATED = 2;
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/**
* Return status for saving which deleted an existing item.
*/
const SAVED_DELETED = 3;
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/**
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* The default aggregation group for CSS files added to the page.
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*/
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const CSS_AGGREGATE_DEFAULT = 0;
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/**
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* The default aggregation group for theme CSS files added to the page.
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*/
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const CSS_AGGREGATE_THEME = 100;
/**
* The default weight for CSS rules that style HTML elements ("base" styles).
*/
const CSS_BASE = -200;
/**
* The default weight for CSS rules that layout a page.
*/
const CSS_LAYOUT = -100;
/**
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* The default weight for CSS rules that style design components (and their associated states and themes.)
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*/
const CSS_COMPONENT = 0;
/**
* The default weight for CSS rules that style states and are not included with components.
*/
const CSS_STATE = 100;
/**
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* The default weight for CSS rules that style themes and are not included with components.
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*/
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const CSS_THEME = 200;
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/**
* The default group for JavaScript settings added to the page.
*/
const JS_SETTING = -200;
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/**
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* The default group for JavaScript and jQuery libraries added to the page.
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*/
const JS_LIBRARY = -100;
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/**
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* The default group for module JavaScript code added to the page.
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*/
const JS_DEFAULT = 0;
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/**
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* The default group for theme JavaScript code added to the page.
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*/
const JS_THEME = 100;
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/**
* The delimiter used to split plural strings.
*
* This is the ETX (End of text) character and is used as a minimal means to
* separate singular and plural variants in source and translation text. It
* was found to be the most compatible delimiter for the supported databases.
*/
const LOCALE_PLURAL_DELIMITER = "\03";
/**
* Prepares a 'destination' URL query parameter for use with url().
* 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 array
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* An associative array containing the key:
* - destination: The value of the current request's 'destination' query
* parameter, if present. This can be either a relative or absolute URL.
* However, for security, redirection to external URLs is not performed.
* If the query parameter isn't present, then the URL of the current
* request is returned.
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*
* @see \Drupal\Core\EventSubscriber\RedirectResponseSubscriber::checkRedirectUrl()
* @ingroup form_api
*
* @deprecated in Drupal 8.0.x-dev, will be removed before Drupal 9.0.0.
* Use the redirect.destination service.
*/
function drupal_get_destination() {
return \Drupal::destination()->getAsArray();
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}
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/**
* Verifies the syntax of the given email address.
* @param string $mail
* A string containing an email address.
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*
* @return bool
*
* @deprecated in Drupal 8.0.x-dev, will be removed before Drupal 9.0.0.
* Use \Drupal::service('email.validator')->isValid().
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*/
return \Drupal::service('email.validator')->isValid($mail);
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}
/**
* @} End of "defgroup validation".
*/
/**
* @defgroup sanitization Sanitization functions
* @{
* Functions to sanitize values.
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*
* See https://www.drupal.org/writing-secure-code for information
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* on writing secure code.
/**
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* Strips dangerous protocols from a URI and encodes it for output to HTML.
*
* @param $uri
* A plain-text URI that might contain dangerous protocols.
*
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* @return string
* 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 $attributes array passed to Drupal\Core\Template\Attribute,
* because Drupal\Core\Template\Attribute expects those values to be
* plain-text strings. To pass a filtered URI to
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* Drupal\Core\Template\Attribute, call
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* \Drupal\Component\Utility\UrlHelper::stripDangerousProtocols() instead.
*
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* @see \Drupal\Component\Utility\UrlHelper::stripDangerousProtocols()
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* @see \Drupal\Component\Utility\UrlHelper::filterBadProtocol()
*
* @deprecated in Drupal 8.0.x-dev, will be removed before Drupal 9.0.0.
* Use UrlHelper::stripDangerousProtocols() or UrlHelper::filterBadProtocol()
* instead. UrlHelper::stripDangerousProtocols() can be used in conjunction
* with \Drupal\Component\Utility\SafeMarkup::format() and an @variable
* placeholder which will perform the necessary escaping.
* UrlHelper::filterBadProtocol() is functionality equivalent to check_url()
* apart from the fact it is protected from double escaping bugs. Note that
* this method no longer marks its output as safe.
*
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return Html::escape(UrlHelper::stripDangerousProtocols($uri));
/**
* @} End of "defgroup sanitization".
*/
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* Generates a string representation for the given byte count.
* A size in bytes.
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* @param $langcode
* Optional language code to translate to a language other than what is used
* to display the page.
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*
* @return \Drupal\Core\StringTranslation\TranslatableString
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function format_size($size, $langcode = NULL) {
if ($size < Bytes::KILOBYTE) {
return \Drupal::translation()->formatPlural($size, '1 byte', '@count bytes', array(), array('langcode' => $langcode));
$size = $size / Bytes::KILOBYTE; // Convert bytes to kilobytes.
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$units = ['KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
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foreach ($units as $unit) {
if (round($size, 2) >= Bytes::KILOBYTE) {
$size = $size / Bytes::KILOBYTE;
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}
else {
break;
}
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$args = ['@size' => round($size, 2)];
$options = ['langcode' => $langcode];
switch ($unit) {
case 'KB':
return new TranslatableString('@size KB', $args, $options);
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case 'MB':
return new TranslatableString('@size MB', $args, $options);
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case 'GB':
return new TranslatableString('@size GB', $args, $options);
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case 'TB':
return new TranslatableString('@size TB', $args, $options);
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case 'PB':
return new TranslatableString('@size PB', $args, $options);
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case 'EB':
return new TranslatableString('@size EB', $args, $options);
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case 'ZB':
return new TranslatableString('@size ZB', $args, $options);
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case 'YB':
return new TranslatableString('@size YB', $args, $options);
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}
* Formats a date, using a date type or a custom date format string.
* A UNIX timestamp to format.
* (optional) The format to use, one of:
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* - One of the built-in formats: 'short', 'medium',
* 'long', 'html_datetime', 'html_date', 'html_time',
* 'html_yearless_date', 'html_week', 'html_month', 'html_year'.
* - The name of a date type defined by a date format config entity.
* - The machine name of an administrator-defined date format.
* - 'custom', to use $format.
* Defaults to 'medium'.
* (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.
* (optional) Time zone identifier, as described at
* http://php.net/manual/timezones.php Defaults to the time zone used to
* display the page.
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* @param $langcode
* (optional) Language code to translate to. Defaults to the language used to
* display the page.
*
*
* @see \Drupal\Core\Datetime\DateFormatter::format()
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*
* @deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0.
* Use \Drupal::service('date.formatter')->format().
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function format_date($timestamp, $type = 'medium', $format = '', $timezone = NULL, $langcode = NULL) {
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return \Drupal::service('date.formatter')->format($timestamp, $type, $format, $timezone, $langcode);
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}
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/**
* Returns an ISO8601 formatted date based on the given date.
*
* @param $date
* A UNIX timestamp.
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*
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* @return string
* An ISO8601 formatted date.
*/
function date_iso8601($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);
}
/**
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* 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.
*/
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) : '';
}
/**
* 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.
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*
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* If the current time limit is not unlimited 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.
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*
* 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 $time_limit
* An integer specifying the new time limit, in seconds. A value of 0
* indicates unlimited execution time.
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*
* @ingroup php_wrappers
*/
function drupal_set_time_limit($time_limit) {
if (function_exists('set_time_limit')) {
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$current = ini_get('max_execution_time');
// Do not set time limit if it is currently unlimited.
if ($current != 0) {
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@set_time_limit($time_limit);
}
}
}
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* Returns the base URL path (i.e., directory) of the Drupal installation.
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*
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* 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 "/".
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*
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* Examples:
* - http://example.com returns "/" because the path is empty.
* - http://example.com/drupal/folder returns "/drupal/folder/".
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return $GLOBALS['base_path'];
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/**
* Deletes old cached CSS files.
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*
* @deprecated in Drupal 8.x, will be removed before Drupal 9.0.
* Use \Drupal\Core\Asset\AssetCollectionOptimizerInterface::deleteAll().
*/
function drupal_clear_css_cache() {
\Drupal::service('asset.css.collection_optimizer')->deleteAll();
}
* Constructs an array of the defaults that are used for JavaScript assets.
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*
* @param $data
* (optional) The default data parameter for the JavaScript asset array.
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*
* @see hook_js_alter()
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*/
function drupal_js_defaults($data = NULL) {
return array(
'type' => 'file',
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'group' => JS_DEFAULT,
'weight' => 0,
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'scope' => 'header',
'cache' => TRUE,
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'preprocess' => TRUE,
'attributes' => array(),
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'version' => NULL,
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'data' => $data,
'browsers' => array(),
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);
}
/**
* Processes non-asset attachments in a render() structure.
* Libraries, JavaScript settings, feeds, HTML <head> tags and HTML <head> links
* are attached to elements using the #attached property. The #attached property
* is an associative array, where the keys are the attachment types and the
* values are the attached data. For example:
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*
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* @code
* $build['#attached'] = [
* 'library' => ['core/jquery']
* ];
* $build['#attached']['http_header'] = [
* ['Content-Type', 'application/rss+xml; charset=utf-8'],
* ];
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* @endcode
*
* The available keys are:
* - 'library' (asset libraries)
* - 'drupalSettings' (JavaScript settings)
* - 'feed' (RSS feeds)
* - 'html_head' (tags in HTML <head>)
* - 'html_head_link' (<link> tags in HTML <head>)
* - 'http_header' (HTTP headers)
*
* This function processes all non-asset attachments, to apply them to the
* current response (that means all keys except 'library' and 'drupalSettings').
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*
* @param array $elements
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* The structured array describing the data being rendered.
*
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* @see drupal_render()
* @see hook_html_head_alter()
* @see \Drupal\Core\Asset\AssetResolver
* @see \Drupal\Core\EventSubscriber\FinishResponseSubscriber
* @see \Symfony\Component\HttpKernel\KernelEvents::RESPONSE
*
* @throws LogicException
* When attaching something of a non-existing attachment type.
*
* @deprecated Will be removed before Drupal 8.0.0. Specify attached elements in
* the render array from a controller, using ['#attached']. They will be
* rendered into the response towards the end of the render process. For
* example:
* @code
* $build['#attached'] = [
* 'library' => ['core/jquery']
* ];
* $build['#attached']['http_header'] = [
* ['Content-Type', 'application/rss+xml; charset=utf-8'],
* ];
* return $build;
* @endcode
* For manipulating attached renderable items in non-controller applications,
* there are three options:
* - Use hook_page_attachments() and/or hook_page_attachments_alter() to
* change attachments.
* - Set up an event subscriber for the
* Symfony\Component\HttpKernel\KernelEvents::RESPONSE event. See
* Drupal\Core\EventSubscriber\FinishResponseSubscriber for an example.
* - Specify $variables['#attached'] in theme preprocess functions.
* To render attachments without a controller, use the
* 'bare_html_page_renderer' service.
*/
function drupal_process_attached(array $elements) {
$build['#attached'] = $elements['#attached'];
\Drupal::service('renderer')->render($build);
}
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/**
* Adds JavaScript to change the state of an element based on another element.
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*
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* 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),
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* ),
* ),
* );
* @endcode
*
* The following states may be applied to an element:
* - enabled
* - disabled
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* - required
* - optional
* - visible
* - invisible
* - checked
* - unchecked
* - expanded
* - collapsed
*
* The following states may be used in remote conditions:
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* - empty
* - filled
* - checked
* - unchecked
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* - expanded
* - collapsed
* - value
*
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* 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 $elements
* A renderable array element having a #states property as described above.
*
* @see form_example_states_form()
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*/
function drupal_process_states(&$elements) {
$elements['#attached']['library'][] = 'core/drupal.states';
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// Elements of '#type' => 'item' are not actual form input elements, but we
// still want to be able to show/hide them. Since there's no actual HTML input
// element available, setting #attributes does not make sense, but a wrapper
// is available, so setting #wrapper_attributes makes it work.
$key = ($elements['#type'] == 'item') ? '#wrapper_attributes' : '#attributes';
$elements[$key]['data-drupal-states'] = JSON::encode($elements['#states']);
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}
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/**
* Assists in attaching the tableDrag JavaScript behavior to a themed table.
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*
* 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.
*
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* 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 and it
* may be set as follows:
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* @code
* $table = array(
* '#type' => 'table',
* '#header' => $header,
* '#rows' => $rows,
* '#attributes' => array(
* 'id' => 'my-module-table',
* ),
* );
* return drupal_render($table);
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* @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');
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* @endcode
*
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* Each row of the table must also have a class of "draggable" in order to
* enable the drag handles:
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* @code
* $row = array(...);
* $rows[] = array(
* 'data' => $row,
* 'class' => array('draggable'),
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* );
* @endcode
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* 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_attach_tabledrag() would then be written as such:
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* @code
* drupal_attach_tabledrag('my-module-table', array(
* 'action' => 'order',
* 'relationship' => 'sibling',
* 'group' => 'my-elements-weight',
* );
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* @endcode
*
* In a more complex case where there are several groups in one column (such as
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* the block regions on the admin/structure/block page), a separate subgroup
* class must also be added to differentiate the groups.
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* @code
* $form['my_elements'][$region][$delta]['weight']['#attributes']['class'] = array('my-elements-weight', 'my-elements-weight-' . $region);
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* @endcode
*
* The 'group' option is still 'my-element-weight', and the additional
* 'subgroup' option will be passed in as 'my-elements-weight-' . $region. This
* also means that you'll need to call drupal_attach_tabledrag() once for every
* region added.
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*
* @code
* foreach ($regions as $region) {
* drupal_attach_tabledrag('my-module-table', array(
* 'action' => 'order',
* 'relationship' => 'sibling',
* 'group' => 'my-elements-weight',
* 'subgroup' => 'my-elements-weight-' . $region,
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* }
* @endcode
*
* In a situation where tree relationships are present, adding multiple
* subgroups is not necessary, because the table will contain indentations that
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* provide enough information about the sibling and parent relationships. See
* MenuForm::BuildOverviewForm for an example creating a table
* containing parent relationships.
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*
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* @param $element
* A form element to attach the tableDrag behavior to.
* @param array $options
* These options are used to generate JavaScript settings necessary to
* configure the tableDrag behavior appropriately for this particular table.
* An associative array containing the following keys:
* - '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">.
* - '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.
* - 'relationship': String describing where the "action" option
* 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).
* - 'group': A class name applied on all related form elements for this action.
* - 'subgroup': (optional) If the group has several subgroups within it, this
* string should contain the class name identifying fields in the same
* subgroup.
* - 'source': (optional) If the $action is 'match', this string should contain
* the classname identifying what field will be used as the source value
* when matching the value in $subgroup.
* - 'hidden': (optional) The column containing the field elements may be
* entirely hidden from view dynamically when the JavaScript is loaded. Set
* to FALSE if the column should not be hidden.
* - 'limit': (optional) Limit the maximum amount of parenting in this table.
*
* @see MenuForm::BuildOverviewForm()
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*/
function drupal_attach_tabledrag(&$element, array $options) {
// Add default values to elements.
$options = $options + array(
'subgroup' => NULL,
'source' => NULL,
'hidden' => TRUE,
'limit' => 0
);
$group = $options['group'];
$tabledrag_id = &drupal_static(__FUNCTION__);
$tabledrag_id = (!isset($tabledrag_id)) ? 0 : $tabledrag_id + 1;
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// If a subgroup or source isn't set, assume it is the same as the group.
$target = isset($options['subgroup']) ? $options['subgroup'] : $group;
$source = isset($options['source']) ? $options['source'] : $target;
$element['#attached']['drupalSettings']['tableDrag'][$options['table_id']][$group][$tabledrag_id] = array(
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'target' => $target,
'source' => $source,
'relationship' => $options['relationship'],
'action' => $options['action'],
'hidden' => $options['hidden'],
'limit' => $options['limit'],
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);
$element['#attached']['library'][] = 'core/drupal.tabledrag';
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}
* Deletes old cached JavaScript files and variables.
*
* @deprecated in Drupal 8.x, will be removed before Drupal 9.0.
* Use \Drupal\Core\Asset\AssetCollectionOptimizerInterface::deleteAll().
*/
function drupal_clear_js_cache() {
\Drupal::service('asset.js.collection_optimizer')->deleteAll();
/**
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* Pre-render callback: Renders a link into #markup.
*
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* @deprecated in Drupal 8.x, will be removed before Drupal 9.0.
* Use \Drupal\Core\Render\Element\Link::preRenderLink().
*/
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function drupal_pre_render_link($element) {
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return Element\Link::preRenderLink($element);
}
/**
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* Pre-render callback: 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 links.html.twig. 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
* $build['links'] = array(
* '#theme' => 'links__node',
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* '#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 links.html.twig.
* ),
* ),
* 'statistics' => array(
* '#theme' => 'links__node__statistics',
* '#links' => array(
* // An array of links associated with node statistics, suitable for
* // passing in to links.html.twig.
* ),
* ),
* 'translation' => array(
* '#theme' => 'links__node__translation',
* '#links' => array(
* // An array of links associated with node translation, suitable for
* // passing in to links.html.twig.
* ),
* ),
* );
* @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.
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* For example, adding this code to node.html.twig will result in the comment
* links being rendered as a single list:
* @code
* {{ content.links.comment }}
* @endcode
*
* (where a node's content has been transformed into $content before handing
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* control to the node.html.twig template).
*
* The pre_render function defined here allows the above flexibility, but also
* allows the following code to be used to render all remaining links into a
* single list, regardless of their group:
* @code
* {{ content.links }}
* @endcode
*
* In the above example, this will result in the statistics and translation
* links being rendered together in a single list (but not the comment links,
* which were rendered previously on their own).
*
* Because of the way this function works, the individual properties of each
* group (for example, a group-specific #theme property such as
* 'links__node__comment' in the example above, or any other property such as
* #attributes or #pre_render that is attached to it) are only used when that
* group is rendered on its own. When the group is rendered together with other
* children, these child-specific properties are ignored, and only the overall
* properties of the parent are used.
*/
function drupal_pre_render_links($element) {
$element += array('#links' => array(), '#attached' => array());
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foreach (Element::children($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($child['#printed']) && Element::isVisibleElement($child)) {
$element['#links'] += $child['#links'];
// Mark the child as having been printed already (so that its links
// cannot be mistakenly rendered twice).
$child['#printed'] = TRUE;
}
// Merge attachments.
if (isset($child['#attached'])) {
$element['#attached'] = BubbleableMetadata::mergeAttachments($element['#attached'], $child['#attached']);
}
}
return $element;
}
/**
* Renders final HTML given a structured array tree.
*
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* @deprecated as of Drupal 8.0.x, will be removed before Drupal 9.0.0. Use the
* 'renderer' service instead.
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* @see \Drupal\Core\Render\RendererInterface::renderRoot()
*/
function drupal_render_root(&$elements) {
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return \Drupal::service('renderer')->renderRoot($elements);
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/**
* Renders HTML given a structured array tree.
*
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* @deprecated as of Drupal 8.0.x, will be removed before Drupal 9.0.0. Use the
* 'renderer' service instead.
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*
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* @see \Drupal\Core\Render\RendererInterface::render()
*/
function drupal_render(&$elements, $is_recursive_call = FALSE) {
return \Drupal::service('renderer')->render($elements, $is_recursive_call);
}
/**
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* Renders children of an element and concatenates them.
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* @param array $element
* The structured array whose children shall be rendered.
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* @param array $children_keys
* (optional) If the keys of the element's children are already known, they
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* can be passed in to save another run of
* \Drupal\Core\Render\Element::children().
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*
* @return string|\Drupal\Component\Utility\SafeStringInterface
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* The rendered HTML of all children of the element.
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* @see drupal_render()
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function drupal_render_children(&$element, $children_keys = NULL) {
if ($children_keys === NULL) {
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$children_keys = Element::children($element);
}
$output = '';
foreach ($children_keys as $key) {
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if (!empty($element[$key])) {
$output .= drupal_render($element[$key]);
}
return SafeString::create($output);
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}
/**
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* Renders an element.
*
* This function renders an element. 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.
*
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* @param $element
* The element to be rendered.
*
* @return
* The rendered element.
*
* @see \Drupal\Core\Render\RendererInterface