protected function extractInterpolation($list)
{
$items = $list[2];
foreach ($items as $i => $item) {
if ($item[0] === Type::T_INTERPOLATE) {
$before = [Type::T_LIST, $list[1], array_slice($items, 0, $i)];
$after = [Type::T_LIST, $list[1], array_slice($items, $i + 1)];
return [Type::T_INTERPOLATED, $item, $before, $after];
}
}
return $list;
}