function _ckeditor5_theme_css

Retrieves the default theme's CKEditor 5 stylesheets.

Themes may specify CSS files for use within CKEditor 5 by including a "ckeditor5-stylesheets" key in their .info.yml file.

ckeditor5-stylesheets:
  - css/ckeditor.css

Return value

string[] A list of paths to CSS files.

File

core/modules/ckeditor5/ckeditor5.module, line 633

Code

function _ckeditor5_theme_css($theme = NULL) : array {
    $css = [];
    if (!isset($theme)) {
        $theme = \Drupal::config('system.theme')->get('default');
    }
    if (isset($theme) && ($theme_path = \Drupal::service('extension.list.theme')->getPath($theme))) {
        $info = \Drupal::service('extension.list.theme')->getExtensionInfo($theme);
        if (isset($info['ckeditor5-stylesheets']) && $info['ckeditor5-stylesheets'] !== FALSE) {
            $css = $info['ckeditor5-stylesheets'];
            foreach ($css as $key => $url) {
                // CSS url is external or relative to Drupal root.
                if (UrlHelper::isExternal($url) || $url[0] === '/') {
                    $css[$key] = $url;
                }
                else {
                    $css[$key] = '/' . $theme_path . '/' . $url;
                }
            }
        }
        if (isset($info['base theme'])) {
            $css = array_merge(_ckeditor5_theme_css($info['base theme']), $css);
        }
    }
    return $css;
}