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.

@todo The purpose of drupal_get_*() is completely different to other page requisite API functions; find and use a different name.

Parameters

$module: The name of a module that registered a library.

$name: (optional) The name of a registered library to retrieve. By default, all libraries registered by $module are returned.

Return value

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 also

drupal_add_library()

hook_library()

hook_library_alter()

5 calls to drupal_get_library()

drupal_add_library in includes/common.inc

Adds multiple JavaScript or CSS files at the same time.

JavaScriptTestCase::testGetLibrary in modules/simpletest/tests/common.test

Tests retrieval of libraries via drupal_get_library().

JavaScriptTestCase::testLibraryAlter in modules/simpletest/tests/common.test

Adds a JavaScript library to the page and alters it.

JavaScriptTestCase::testLibraryNameConflicts in modules/simpletest/tests/common.test

Tests that multiple modules can implement the same library.

JavaScriptTestCase::testLibraryUnknown in modules/simpletest/tests/common.test

Tests non-existing libraries.

2 string references to 'drupal_get_library'

JavaScriptTestCase::resetStaticVariables in modules/simpletest/tests/common.test

Resets static variables related to adding JavaScript to a page.

JavaScriptTestCase::testLibraryUnknown in modules/simpletest/tests/common.test

Tests non-existing libraries.

File

includes/common.inc, line 5022

Code

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];
}

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