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Service.php
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Service.php
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<?php
namespace Sabre\Xml;
/**
* XML parsing and writing service.
*
* You are encouraged to make a instance of this for your application and
* potentially extend it, as a central API point for dealing with xml and
* configuring the reader and writer.
*
* @copyright Copyright (C) 2009-2015 fruux GmbH (https://fruux.com/).
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
class Service {
/**
* This is the element map. It contains a list of XML elements (in clark
* notation) as keys and PHP class names as values.
*
* The PHP class names must implement Sabre\Xml\Element.
*
* Values may also be a callable. In that case the function will be called
* directly.
*
* @var array
*/
public $elementMap = [];
/**
* This is a list of namespaces that you want to give default prefixes.
*
* You must make sure you create this entire list before starting to write.
* They should be registered on the root element.
*
* @var array
*/
public $namespaceMap = [];
/**
* Returns a fresh XML Reader
*
* @return Reader
*/
function getReader() {
$r = new Reader();
$r->elementMap = $this->elementMap;
return $r;
}
/**
* Returns a fresh xml writer
*
* @return Writer
*/
function getWriter() {
$w = new Writer();
$w->namespaceMap = $this->namespaceMap;
return $w;
}
/**
* Parses a document in full.
*
* Input may be specified as a string or readable stream resource.
* The returned value is the value of the root document.
*
* Specifying the $contextUri allows the parser to figure out what the URI
* of the document was. This allows relative URIs within the document to be
* expanded easily.
*
* The $rootElementName is specified by reference and will be populated
* with the root element name of the document.
*
* @param string|resource $input
* @param string|null $contextUri
* @param string|null $rootElementName
* @throws ParseException
* @return array|object|string
*/
function parse($input, $contextUri = null, &$rootElementName = null) {
if (is_resource($input)) {
// Unfortunately the XMLReader doesn't support streams. When it
// does, we can optimize this.
$input = stream_get_contents($input);
}
$r = $this->getReader();
$r->contextUri = $contextUri;
$r->xml($input);
$result = $r->parse();
$rootElementName = $result['name'];
return $result['value'];
}
/**
* Parses a document in full, and specify what the expected root element
* name is.
*
* This function works similar to parse, but the difference is that the
* user can specify what the expected name of the root element should be,
* in clark notation.
*
* This is useful in cases where you expected a specific document to be
* passed, and reduces the amount of if statements.
*
* @param string $rootElementName
* @param string|resource $input
* @param string|null $contextUri
* @return void
*/
function expect($rootElementName, $input, $contextUri = null) {
if (is_resource($input)) {
// Unfortunately the XMLReader doesn't support streams. When it
// does, we can optimize this.
$input = stream_get_contents($input);
}
$r = $this->getReader();
$r->contextUri = $contextUri;
$r->xml($input);
$result = $r->parse();
if ($rootElementName !== $result['name']) {
throw new ParseException('Expected ' . $rootElementName . ' but received ' . $result['name'] . ' as the root element');
}
return $result['value'];
}
/**
* Generates an XML document in one go.
*
* The $rootElement must be specified in clark notation.
* The value must be a string, an array or an object implementing
* XmlSerializable. Basically, anything that's supported by the Writer
* object.
*
* $contextUri can be used to specify a sort of 'root' of the PHP application,
* in case the xml document is used as a http response.
*
* This allows an implementor to easily create URI's relative to the root
* of the domain.
*
* @param string $rootElementName
* @param string|array|XmlSerializable $value
* @param string|null $contextUri
*/
function write($rootElementName, $value, $contextUri = null) {
$w = $this->getWriter();
$w->openMemory();
$w->contextUri = $contextUri;
$w->setIndent(true);
$w->startDocument();
$w->writeElement($rootElementName, $value);
return $w->outputMemory();
}
/**
* Parses a clark-notation string, and returns the namespace and element
* name components.
*
* If the string was invalid, it will throw an InvalidArgumentException.
*
* @param string $str
* @throws InvalidArgumentException
* @return array
*/
static function parseClarkNotation($str) {
if (!preg_match('/^{([^}]*)}(.*)$/', $str, $matches)) {
throw new \InvalidArgumentException('\'' . $str . '\' is not a valid clark-notation formatted string');
}
return [
$matches[1],
$matches[2]
];
}
}

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