/**
* Extend blueprint with another blueprint.
*
* @param Blueprint $extends
* @param bool $append
*/
public function extend(Blueprint $extends, $append = false)
{
$blueprints = $append ? $this->items : $extends->toArray();
$appended = $append ? $extends->toArray() : $this->items;
$bref_stack = array(&$blueprints);
$head_stack = array($appended);
do {
end($bref_stack);
$bref =& $bref_stack[key($bref_stack)];
$head = array_pop($head_stack);
unset($bref_stack[key($bref_stack)]);
foreach (array_keys($head) as $key) {
if (isset($key, $bref[$key]) && is_array($bref[$key]) && is_array($head[$key])) {
$bref_stack[] =& $bref[$key];
$head_stack[] = $head[$key];
} else {
$bref = array_merge($bref, array($key => $head[$key]));
}
}
} while (count($head_stack));
$this->items = $blueprints;
}
/**
* @return array
*/
public function toArray()
{
return $this->blueprints->toArray();
}