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<?php
declare(strict_types=1);
namespace Sabre\Xml\Element;
use Sabre\Xml\Element;
use Sabre\Xml\Reader;
use Sabre\Xml\Writer;
/**
* The XmlFragment element allows you to extract a portion of your xml tree,
* and get a well-formed xml string.
*
* This goes a bit beyond `innerXml` and friends, as we'll also match all the
* correct namespaces.
*
* Please note that the XML fragment:
*
* 1. Will not have an <?xml declaration.
* 2. Or a DTD
* 3. It will have all the relevant xmlns attributes.
* 4. It may not have a root element.
*/
class XmlFragment implements Element
{
/**
* The inner XML value.
*
* @var string
*/
protected $xml;
/**
* Constructor.
*/
public function __construct(string $xml)
{
$this->xml = $xml;
}
/**
* Returns the inner XML document.
*/
public function getXml(): string
{
return $this->xml;
}
/**
* The xmlSerialize metod is called during xml writing.
*
* Use the $writer argument to write its own xml serialization.
*
* An important note: do _not_ create a parent element. Any element
* implementing XmlSerializble should only ever write what's considered
* its 'inner xml'.
*
* The parent of the current element is responsible for writing a
* containing element.
*
* This allows serializers to be re-used for different element names.
*
* If you are opening new elements, you must also close them again.
*/
public function xmlSerialize(Writer $writer)
{
$reader = new Reader();
// Wrapping the xml in a container, so root-less values can still be
// parsed.
$xml = <<<XML
<?xml version="1.0"?>
<xml-fragment xmlns="http://sabre.io/ns">{$this->getXml()}</xml-fragment>
XML;
$reader->xml($xml);
while ($reader->read()) {
if ($reader->depth < 1) {
// Skipping the root node.
continue;
}
switch ($reader->nodeType) {
case Reader::ELEMENT:
$writer->startElement(
$reader->getClark()
);
$empty = $reader->isEmptyElement;
while ($reader->moveToNextAttribute()) {
switch ($reader->namespaceURI) {
case '':
$writer->writeAttribute($reader->localName, $reader->value);
break;
case 'http://www.w3.org/2000/xmlns/':
// Skip namespace declarations
break;
default:
$writer->writeAttribute($reader->getClark(), $reader->value);
break;
}
}
if ($empty) {
$writer->endElement();
}
break;
case Reader::CDATA:
case Reader::TEXT:
$writer->text(
$reader->value
);
break;
case Reader::END_ELEMENT:
$writer->endElement();
break;
}
}
}
/**
* The deserialize method is called during xml parsing.
*
* This method is called statictly, this is because in theory this method
* may be used as a type of constructor, or factory method.
*
* Often you want to return an instance of the current class, but you are
* free to return other data as well.
*
* You are responsible for advancing the reader to the next element. Not
* doing anything will result in a never-ending loop.
*
* If you just want to skip parsing for this element altogether, you can
* just call $reader->next();
*
* $reader->parseInnerTree() will parse the entire sub-tree, and advance to
* the next element.
*
* @return mixed
*/
public static function xmlDeserialize(Reader $reader)
{
$result = new self($reader->readInnerXml());
$reader->next();
return $result;
}
}
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