function _file_generic_settings_extensions

Render API callback: Validates the allowed file extensions field.

This function is assigned as an #element_validate callback in file_field_instance_settings_form().

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

core/modules/file/file.field.inc, line 154

Field module functionality for the File module.

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);
    }
  }
}