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