protected function pushBlock($selectors, $pos = 0)
{
list($line, $column) = $this->getSourcePosition($pos);
$b = new Block();
$b->sourceLine = $line;
$b->sourceColumn = $column;
$b->sourceIndex = $this->sourceIndex;
$b->selectors = $selectors;
$b->comments = [];
$b->parent = $this->env;
if (!$this->env) {
$b->children = [];
} elseif (empty($this->env->children)) {
$this->env->children = $this->env->comments;
$b->children = [];
$this->env->comments = [];
} else {
$b->children = $this->env->comments;
$this->env->comments = [];
}
$this->env = $b;
return $b;
}