protected function get_source_files()
{
$filenames = explode_whitespace($this->entity->reference_implementation());
$files = array();
foreach ($filenames as $name) {
$full_path = $this->entity->data_path() . $name;
if (!file_exists($full_path)) {
throw new Exception("Reference implementation not found: {$name}");
}
$contents = file_get_contents($full_path);
$files[$name] = $contents;
}
return $files;
}
function writable_files()
{
$files = $this->attribute('writable files');
return $files ? explode_whitespace($files) : array();
}