function _file_generic_settings_extensions

Element validate callback for the allowed file extensions field.

This doubles as a convenience clean-up function and a validation routine. Commas are allowed by the end-user, but ultimately the value will be stored as a space-separated list for compatibility with file_validate_extensions().

File

modules/file/file.field.inc, line 141

Code

function _file_generic_settings_extensions($element, &$form_state) {
    if (!empty($element['#value'])) {
        $extensions = preg_replace('/([, ]+\\.?)/', ' ', trim(strtolower($element['#value'])));
        $extensions = array_filter(explode(' ', $extensions));
        $extensions = implode(' ', array_unique($extensions));
        if (!preg_match('/^([a-z0-9]+([.][a-z0-9])* ?)+$/', $extensions)) {
            form_error($element, t('The list of allowed extensions is not valid, be sure to exclude leading dots and to separate extensions with a comma or space.'));
        }
        else {
            form_set_value($element, $extensions, $form_state);
        }
    }
}