Element.php

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<?php
namespace Magento\Framework\Simplexml;

class Element extends \SimpleXMLElement
{
    protected $_parent = null;

    public function setParent($element)
    {
        //$this->_parent = $element;
    }

    public function getParent()
    {
        if (!empty($this->_parent)) {
            $parent = $this->_parent;
        } else {
            $arr = $this->xpath('..');
            if (!isset($arr[0])) {
                throw new \InvalidArgumentException('Root node could not be unset.');
            }
            $parent = $arr[0];
        }
        return $parent;
    }

    public function hasChildren()
    {
        if (!$this->children()) {
            return false;
        }

        // simplexml bug: @attributes is in children() but invisible in foreach
        foreach ($this->children() as $k => $child) {
            return true;
        }
        return false;
    }

    public function getAttribute($name)
    {
        $attrs = $this->attributes();
        return isset($attrs[$name]) ? (string)$attrs[$name] : null;
    }

    public function descend($path)
    {
        # $node = $this->xpath($path);
        # return $node[0];
        if (is_array($path)) {
            $pathArr = $path;
        } else {
            // Simple exploding by / does not suffice,
            // as an attribute value may contain a / inside
            // Note that there are three matches for different kinds of attribute values specification
            if (strpos($path, "@") === false) {
                $pathArr = explode('/', $path);
            } else {
                $regex = "#([^@/\\\"]+(?:@[^=/]+=(?:\\\"[^\\\"]*\\\"|[^/]*))?)/?#";
                $pathArr = $pathMatches = [];
                if (preg_match_all($regex, $path, $pathMatches)) {
                    $pathArr = $pathMatches[1];
                }
            }
        }
        $desc = $this;
        foreach ($pathArr as $nodeName) {
            if (strpos($nodeName, '@') !== false) {
                $a = explode('@', $nodeName);
                $b = explode('=', $a[1]);
                $nodeName = $a[0];
                $attributeName = $b[0];
                $attributeValue = $b[1];
                //
                // Does a very simplistic trimming of attribute value.
                //
                $attributeValue = trim($attributeValue, '"');
                $found = false;
                foreach ($desc->{$nodeName} as $subdesc) {
                    if ((string)$subdesc[$attributeName] === $attributeValue) {
                        $found = true;
                        $desc = $subdesc;
                        break;
                    }
                }
                if (!$found) {
                    $desc = false;
                }
            } else {
                $desc = $desc->{$nodeName};
            }
            if (!$desc) {
                return false;
            }
        }
        return $desc;
    }

    public function setAttribute($name, $value)
    {
        if (!isset($this->attributes()[$name])) {
            $this->addAttribute($name, $value);
        }

        $this->attributes()[$name] = $value;
    }

    public function asArray()
    {
        return $this->_asArray();
    }

    public function asCanonicalArray()
    {
        return $this->_asArray(true);
    }

    protected function _asArray($isCanonical = false)
    {
        $result = [];
        if (!$isCanonical) {
            // add attributes
            foreach ($this->attributes() as $attributeName => $attribute) {
                if ($attribute) {
                    $result['@'][$attributeName] = (string)$attribute;
                }
            }
        }
        // add children values
        if ($this->hasChildren()) {
            foreach ($this->children() as $childName => $child) {
                $result[$childName] = $child->_asArray($isCanonical);
            }
        } else {
            if (empty($result)) {
                // return as string, if nothing was found
                $result = (string)$this;
            } else {
                // value has zero key element
                $result[0] = (string)$this;
            }
        }
        return $result;
    }

    public function asNiceXml($filename = '', $level = 0)
    {
        if (is_numeric($level)) {
            $pad = str_pad('', $level * 3, ' ', STR_PAD_LEFT);
            $nl = "\n";
        } else {
            $pad = '';
            $nl = '';
        }

        $out = $pad . '<' . $this->getName();

        $attributes = $this->attributes();
        if ($attributes) {
            foreach ($attributes as $key => $value) {
                $out .= ' ' . $key . '="' . str_replace('"', '\"', (string)$value) . '"';
            }
        }

        $attributes = $this->attributes('xsi', true);
        if ($attributes) {
            foreach ($attributes as $key => $value) {
                $out .= ' xsi:' . $key . '="' . str_replace('"', '\"', (string)$value) . '"';
            }
        }

        if ($this->hasChildren()) {
            $out .= '>';
            $value = trim((string)$this);
            if (strlen($value)) {
                $out .= $this->xmlentities($value);
            }
            $out .= $nl;
            foreach ($this->children() as $child) {
                $out .= $child->asNiceXml('', is_numeric($level) ? $level + 1 : true);
            }
            $out .= $pad . '</' . $this->getName() . '>' . $nl;
        } else {
            $value = (string)$this;
            if (strlen($value)) {
                $out .= '>' . $this->xmlentities($value) . '</' . $this->getName() . '>' . $nl;
            } else {
                $out .= '/>' . $nl;
            }
        }

        if ((0 === $level || false === $level) && !empty($filename)) {
            file_put_contents($filename, $out);
        }

        return $out;
    }

    public function innerXml($level = 0)
    {
        $out = '';
        foreach ($this->children() as $child) {
            $out .= $child->asNiceXml($level);
        }
        return $out;
    }

    public function xmlentities($value = null)
    {
        if ($value === null) {
            $value = $this;
        }
        $value = (string)$value;

        $value = str_replace(
            ['&', '"', "'", '<', '>'],
            ['&amp;', '&quot;', '&apos;', '&lt;', '&gt;'],
            $value
        );

        return $value;
    }

    public function appendChild($source)
    {
        if ($source->count()) {
            $child = $this->addChild($source->getName());
        } else {
            $child = $this->addChild($source->getName(), $this->xmlentities($source));
        }
        $child->setParent($this);

        $attributes = $source->attributes();
        foreach ($attributes as $key => $value) {
            $child->addAttribute($key, $this->xmlentities($value));
        }

        foreach ($source->children() as $sourceChild) {
            $child->appendChild($sourceChild);
        }
        return $this;
    }

    public function extend($source, $overwrite = false)
    {
        if (!$source instanceof \Magento\Framework\Simplexml\Element) {
            return $this;
        }

        foreach ($source->children() as $child) {
            $this->extendChild($child, $overwrite);
        }

        return $this;
    }

    public function extendChild($source, $overwrite = false)
    {
        // this will be our new target node
        $targetChild = null;

        // name of the source node
        $sourceName = $source->getName();

        // here we have children of our source node
        $sourceChildren = $source->children();

        if (!$source->hasChildren()) {
            // handle string node
            if (isset($this->{$sourceName})) {
                // if target already has children return without regard
                if ($this->{$sourceName}->hasChildren()) {
                    return $this;
                }
                if ($overwrite) {
                    unset($this->{$sourceName});
                } else {
                    return $this;
                }
            }

            $targetChild = $this->addChild($sourceName, $source->xmlentities());
            $targetChild->setParent($this);
            foreach ($source->attributes() as $key => $value) {
                $targetChild->addAttribute($key, $this->xmlentities($value));
            }
            return $this;
        }

        if (isset($this->{$sourceName})) {
            $targetChild = $this->{$sourceName};
        }

        if ($targetChild === null) {
            // if child target is not found create new and descend
            $targetChild = $this->addChild($sourceName);
            $targetChild->setParent($this);
            foreach ($source->attributes() as $key => $value) {
                $targetChild->addAttribute($key, $this->xmlentities($value));
            }
        }

        // finally add our source node children to resulting new target node
        foreach ($sourceChildren as $childKey => $childNode) {
            $targetChild->extendChild($childNode, $overwrite);
        }

        return $this;
    }

    public function setNode($path, $value, $overwrite = true)
    {
        $arr1 = explode('/', $path);
        $arr = [];
        foreach ($arr1 as $v) {
            if (!empty($v)) {
                $arr[] = $v;
            }
        }
        $last = sizeof($arr) - 1;
        $node = $this;
        foreach ($arr as $i => $nodeName) {
            if ($last === $i) {
                if (!isset($node->{$nodeName}) || $overwrite) {
                    $node->{$nodeName} = $value;
                }
            } else {
                if (!isset($node->{$nodeName})) {
                    $node = $node->addChild($nodeName);
                } else {
                    $node = $node->{$nodeName};
                }
            }
        }
        return $this;
    }

    public function unsetSelf()
    {
        $uniqueId = uniqid();
        $this['_unique_id'] = $uniqueId;
        $children = $this->getParent()->xpath('*');
        for ($i = count($children); $i > 0; $i--) {
            if ($children[$i - 1][0]['_unique_id'] == $uniqueId) {
                unset($children[$i - 1][0]);
                return;
            }
        }
    }
}