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<?php
/**
* Copyright (c) 2013-2020 Nicolò Martini
*
* For the full copyright and license information, please view
* the LICENSE.md file that was distributed with this source code.
*
* @see https://github.com/nicmart/Tree
*/
namespace Tree\Builder;
use Tree\Node\Node;
use Tree\Node\NodeInterface;
/**
* Main implementation of the NodeBuilderInterface.
*/
class NodeBuilder implements NodeBuilderInterface
{
/**
* @var NodeInterface[]
*/
private $nodeStack = [];
public function __construct(?NodeInterface $node = null)
{
$this->setNode($node ?: $this->nodeInstanceByValue());
}
public function setNode(NodeInterface $node)
{
$this
->emptyStack()
->pushNode($node);
return $this;
}
public function getNode()
{
return $this->nodeStack[\count($this->nodeStack) - 1];
}
public function leaf($value = null)
{
$this->getNode()->addChild(
$this->nodeInstanceByValue($value)
);
return $this;
}
public function leafs($value1 /*, $value2, ... */)
{
foreach (\func_get_args() as $value) {
$this->leaf($value);
}
return $this;
}
public function tree($value = null)
{
$node = $this->nodeInstanceByValue($value);
$this->getNode()->addChild($node);
$this->pushNode($node);
return $this;
}
public function end()
{
$this->popNode();
return $this;
}
public function nodeInstanceByValue($value = null)
{
return new Node($value);
}
public function value($value)
{
$this->getNode()->setValue($value);
return $this;
}
private function emptyStack()
{
$this->nodeStack = [];
return $this;
}
private function pushNode(NodeInterface $node)
{
\array_push($this->nodeStack, $node);
return $this;
}
private function popNode()
{
return \array_pop($this->nodeStack);
}
}
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