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<?php |
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/** |
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* XMPP Library |
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* |
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* Copyright (C) 2016, Some right reserved. |
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* |
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* @author Kacper "Kadet" Donat <[email protected]> |
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* |
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* Contact with author: |
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* Xmpp: [email protected] |
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* E-mail: [email protected] |
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* |
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* From Kadet with love. |
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*/ |
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namespace Kadet\Xmpp\Xml; |
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class XPathQuery |
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{ |
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private $_query; |
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/** @var \DOMXPath */ |
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private $_xpath; |
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private $_context; |
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public function with(string $prefix, string $namespace) |
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{ |
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$this->_xpath->registerNamespace($prefix, $namespace); |
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return $this; |
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} |
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public function query(string $query = null) |
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{ |
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/** @var \DOMNode $element */ |
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foreach($this->_xpath->query($query ?: $this->_query) as $element) { |
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yield $this->getElementFromPath($element->getNodePath()); |
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} |
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} |
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public function evaluate(string $query = null) |
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{ |
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return $this->_xpath->evaluate($query ?: $this->_query); |
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} |
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public function __construct(string $query, XmlElement $context) |
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{ |
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$document = new \DOMDocument(); |
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$document->loadXML($context->xml(false)); |
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$this->_xpath = new \DOMXPath($document); |
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$this->with('php', 'http://php.net/xpath'); |
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$this->_query = $query; |
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$this->_context = $context; |
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} |
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/** |
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* Hack for supporting XPath outside of standard XML implementation. |
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* Why? Becuase simplexml sucks so much. |
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* DOM suck even more, and I'm better with writing one hack for xpath |
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* than with writing hack for almost everyfuckingthing™. |
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* |
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* @param $path |
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* @return false|XmlElement |
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*/ |
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private function getElementFromPath($path) |
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{ |
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// Split path into pieces and remove the first one (it's current node) |
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$path = explode('/', trim($path, '/')); |
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array_shift($path); |
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$current = $this->_context; |
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foreach($path as $chunk) { |
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// Chunk is in format node-name[index], parse it with regex |
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preg_match('/([\w\*]+)(?:\[([0-9]+)\])?/', $chunk, $matches); |
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$name = $matches[1]; |
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$index = isset($matches[2]) ? $matches[2] - 1 : 0; |
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if($name == '*') { |
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// Path returns * if namespace occurs so we need to obtain index-th child |
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$current = $current->children[$index]; |
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} else { |
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// We need to obtain index-th child with $name name |
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$current = $current->element($name, null, $index); |
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} |
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} |
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return $current; |
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} |
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} |
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kadet1090 /
nucleus
