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<?php | |
namespace SDom\Node; | |
/** | |
* Node representing an HTML comment. | |
* | |
* Class Comment | |
* @package SDom\Node | |
*/ | |
class Comment implements NodeInterface | |
{ | |
/** | |
* @var string | |
*/ | |
protected $content; | |
/** | |
* @var Element | |
*/ | |
protected $parent; | |
/** | |
* Comment constructor. | |
* | |
* @param string $content | |
*/ | |
public function __construct(string $content) | |
{ | |
$this->content = $content; | |
} | |
/** | |
* @inheritDoc | |
*/ | |
public function __toString(): string | |
{ | |
return '<!--' . $this->content . '-->'; | |
} | |
/** | |
* @inheritDoc | |
*/ | |
public function __clone() | |
{ | |
throw new \BadMethodCallException('Native cloning is not allowed, use clone() instead.'); | |
} | |
/** | |
* @inheritDoc | |
*/ | |
public function parent(): ?NodeInterface | |
{ | |
return $this->parent; | |
} | |
/** | |
* @inheritDoc | |
*/ | |
public function attach(NodeInterface $parent): NodeInterface | |
{ | |
if (!$parent instanceof Element) { | |
throw new \InvalidArgumentException(sprintf( | |
'Only node of type %s can be parent to a %s node.', | |
Element::class, | |
self::class | |
)); | |
} | |
if ($parent->isVoid()) { | |
throw new \InvalidArgumentException(sprintf( | |
'Node of type %s (void) cannot be parent to a %s node.', | |
Element::class, | |
self::class | |
)); | |
} | |
if (isset($this->parent)) { | |
$this->parent->removeChild($this); | |
} | |
$this->parent = $parent; | |
return $this; | |
} | |
/** | |
* @inheritDoc | |
*/ | |
public function detach(): NodeInterface | |
{ | |
if (isset($this->parent)) { | |
$parent = $this->parent; | |
$this->parent = null; | |
// if detach() is called from a removeChild(), then isChild will fail - disregarding it will cause recursion | |
if ($parent->isChild($this)) { | |
$parent->removeChild($this); | |
} | |
} | |
return $this; | |
} | |
/** | |
* @inheritDoc | |
*/ | |
public function clone(): NodeInterface | |
{ | |
return new static($this->content); | |
} | |
} |