1:  2:  3:  4:  5:  6:  7:  8:  9: 10: 11: 12: 13: 14: 15: 16: 17: 18: 19: 20: 21: 22: 23: 24: 25: 26: 27: 28: 29: 30: 31: 32: 33: 34: 35: 36: 37: 38: 39: 40: 41: 42: 43: 44: 45: 46: 47: 48: 49: 50: 51: 52: 53: 54: 55: 56: 57: 58: 59: 60: 61: 62: 63: 64: 65: 66: 67: 68: 69: 70: 71: 72: 73: 74: 75: 76: 77: 78: 79: 80: 81: 82: 83: 
<?php

namespace SDom\Node;

/**
 * Node representing an HTML document's DocType declaration.
 *
 * Class DocType
 * @package SDom\Node
 */
class DocType implements NodeInterface
{
    /**
     * @var string
     */
    protected $content;

    /**
     * DocType constructor.
     *
     * @param string $content
     */
    public function __construct(string $content)
    {
        $this->content = $content;
    }

    /**
     * @inheritdoc
     */
    public function __toString(): string
    {
        return '<!DOCTYPE ' . $this->content . '>';
    }

    /**
     * @inheritDoc
     */
    public function __clone()
    {
        throw new \BadMethodCallException('Native cloning is not allowed, use clone() instead.');
    }

    /**
     * @inheritDoc
     */
    public function parent(): ?NodeInterface
    {
        return null;
    }

    /**
     * @inheritDoc
     */
    public function attach(NodeInterface $parent): NodeInterface
    {
        throw new \BadMethodCallException(sprintf(
            'Node of type %s cannot be part of a hierarchy, invoking %s has no effect.',
            get_class($this),
            explode('::', __METHOD__)[1]
        ));
    }

    /**
     * @inheritDoc
     */
    public function detach(): NodeInterface
    {
        throw new \BadMethodCallException(sprintf(
            'Node of type %s cannot be part of a hierarchy, invoking %s has no effect.',
            get_class($this),
            explode('::', __METHOD__)[1]
        ));
    }

    /**
     * @inheritDoc
     */
    public function clone(): NodeInterface
    {
        return new static($this->content);
    }
}