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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\Node;
use Tree\Visitor\Visitor;
trait NodeTrait
{
/**
* @var mixed
*/
private $value;
/**
* parent.
*
* @var NodeInterface
*/
private $parent;
/**
* @var NodeInterface[]
*/
private $children = [];
public function setValue($value)
{
$this->value = $value;
return $this;
}
public function getValue()
{
return $this->value;
}
public function addChild(NodeInterface $child)
{
$child->setParent($this);
$this->children[] = $child;
return $this;
}
public function removeChild(NodeInterface $child)
{
foreach ($this->children as $key => $myChild) {
if ($child === $myChild) {
unset($this->children[$key]);
}
}
$this->children = \array_values($this->children);
$child->setParent(null);
return $this;
}
public function removeAllChildren()
{
$this->setChildren([]);
return $this;
}
public function getChildren()
{
return $this->children;
}
public function setChildren(array $children)
{
$this->removeParentFromChildren();
$this->children = [];
foreach ($children as $child) {
$this->addChild($child);
}
return $this;
}
public function setParent(?NodeInterface $parent = null)
{
$this->parent = $parent;
}
public function getParent()
{
return $this->parent;
}
public function getAncestors()
{
$parents = [];
$node = $this;
while ($parent = $node->getParent()) {
\array_unshift($parents, $parent);
$node = $parent;
}
return $parents;
}
public function getAncestorsAndSelf()
{
return \array_merge($this->getAncestors(), [$this]);
}
public function getNeighbors()
{
$neighbors = $this->getParent()->getChildren();
$current = $this;
return \array_values(
\array_filter(
$neighbors,
static function ($item) use ($current) {
return $item !== $current;
}
)
);
}
public function getNeighborsAndSelf()
{
return $this->getParent()->getChildren();
}
public function isLeaf()
{
return 0 === \count($this->children);
}
/**
* @return bool
*/
public function isRoot()
{
return null === $this->getParent();
}
public function isChild()
{
return null !== $this->getParent();
}
/**
* Find the root of the node.
*
* @return NodeInterface
*/
public function root()
{
$node = $this;
while ($parent = $node->getParent()) {
$node = $parent;
}
return $node;
}
/**
* Return the distance from the current node to the root.
*
* Warning, can be expensive, since each descendant is visited
*
* @return int
*/
public function getDepth()
{
if ($this->isRoot()) {
return 0;
}
return $this->getParent()->getDepth() + 1;
}
/**
* Return the height of the tree whose root is this node.
*
* @return int
*/
public function getHeight()
{
if ($this->isLeaf()) {
return 0;
}
$heights = [];
foreach ($this->getChildren() as $child) {
$heights[] = $child->getHeight();
}
return \max($heights) + 1;
}
/**
* Return the number of nodes in a tree.
*
* @return int
*/
public function getSize()
{
$size = 1;
foreach ($this->getChildren() as $child) {
$size += $child->getSize();
}
return $size;
}
public function accept(Visitor $visitor)
{
return $visitor->visit($this);
}
private function removeParentFromChildren()
{
foreach ($this->getChildren() as $child) {
$child->setParent(null);
}
}
}
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