function ThemeManager::alterForTheme

@todo Should we cache some of these information?

File

core/lib/Drupal/Core/Theme/ThemeManager.php, line 423

Class

ThemeManager

Provides the default implementation of a theme manager.

Namespace

Code

public function alterForTheme(ActiveTheme $theme, $type, &$data, &$context1 = NULL, &$context2 = NULL) {
    // Most of the time, $type is passed as a string, so for performance,
    // normalize it to that. When passed as an array, usually the first item in
    // the array is a generic type, and additional items in the array are more
    // specific variants of it, as in the case of array('form', 'form_FORM_ID').
    if (is_array($type)) {
        $extra_types = $type;
        $type = array_shift($extra_types);
        // Allow if statements in this function to use the faster isset() rather
        // than !empty() both when $type is passed as a string, or as an array with
        // one item.
        if (empty($extra_types)) {
            unset($extra_types);
        }
    }
    $theme_keys = array_reverse(array_keys($theme->getBaseThemeExtensions()));
    $theme_keys[] = $theme->getName();
    $functions = [];
    foreach ($theme_keys as $theme_key) {
        $function = $theme_key . '_' . $type . '_alter';
        if (function_exists($function)) {
            $functions[] = $function;
        }
        if (isset($extra_types)) {
            foreach ($extra_types as $extra_type) {
                $function = $theme_key . '_' . $extra_type . '_alter';
                if (function_exists($function)) {
                    $functions[] = $function;
                }
            }
        }
    }
    foreach ($functions as $function) {
        $function($data, $context1, $context2);
    }
}