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<?php |
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/** |
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* Nucleus - XMPP Library for PHP |
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* |
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* Copyright (C) 2016, Some rights 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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use Kadet\Xmpp\Utils\BetterEmitter; |
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use Kadet\Xmpp\Utils\BetterEmitterInterface; |
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/** |
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* Class XmlParser |
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* @package Kadet\Xmpp\Xml |
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* |
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* @event element |
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*/ |
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class XmlParser implements BetterEmitterInterface |
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{ |
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use BetterEmitter; |
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/** |
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* Factory used for XML element creation |
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* |
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* @var XmlElementFactory |
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*/ |
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public $factory; |
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/** |
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* XML element stack. |
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* |
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* @var XmlElement[] |
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*/ |
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private $_stack = []; |
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/** |
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* XML parser resource |
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* |
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* @var resource |
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*/ |
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private $_parser; |
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/** |
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* XmlParser constructor. |
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* |
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* @param XmlElementFactory $factory Factory used for XML element creation |
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*/ |
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public function __construct(XmlElementFactory $factory) |
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{ |
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$this->factory = $factory; |
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$this->reset(); |
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} |
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/** |
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* Resets state of xml parser. |
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*/ |
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public function reset() |
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{ |
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$this->_parser = xml_parser_create(); |
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xml_parser_set_option($this->_parser, XML_OPTION_SKIP_WHITE, 1); |
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xml_parser_set_option($this->_parser, XML_OPTION_CASE_FOLDING, 0); |
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xml_set_element_handler($this->_parser, function ($parser, $name, $attrs) { |
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$this->handleElementStart($name, $attrs); |
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}, function () { |
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$this->handleElementEnd(); |
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}); |
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xml_set_character_data_handler($this->_parser, function ($parser, $data) { |
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$this->handleTextData($data); |
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}); |
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$this->_stack = []; |
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} |
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public function parse($data) |
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{ |
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xml_parse($this->_parser, $data); |
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} |
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private function _attributes($attrs) |
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{ |
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$attributes = []; |
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$namespaces = []; |
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foreach ($attrs as $attr => $value) { |
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if (strpos($attr, 'xmlns') === 0) { |
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$namespaces[substr($attr, 6) ?: null] = $value; |
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} else { |
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$attributes[$attr] = $value; |
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} |
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} |
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return [$attributes, $namespaces]; |
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} |
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private function _lookup($prefix, $namespaces) |
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{ |
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if ($prefix === 'xmlns') { |
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return 'http://www.w3.org/2000/xmlns/'; |
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} |
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if (isset($namespaces[ $prefix ])) { |
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return $namespaces[ $prefix ]; |
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} |
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return !empty($this->_stack) ? end($this->_stack)->lookupUri($prefix) : null; |
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} |
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private function _element($name, $attrs) |
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{ |
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list($attributes, $namespaces) = $this->_attributes($attrs); |
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list($tag, $prefix) = XmlElement::resolve($name); |
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$uri = $this->_lookup($prefix, $namespaces); |
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/** @var XmlElement $element */ |
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$element = $this->factory->create($uri, $tag, [ $name, $uri ], $this->_getCollocations()); |
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foreach ($namespaces as $prefix => $uri) { |
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$element->setNamespace($uri, $prefix); |
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} |
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foreach ($attributes as $name => $value) { |
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$element->setAttribute($name, $value); |
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} |
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return $element; |
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} |
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private function _getCollocations() |
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{ |
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if(empty($this->_stack)) { |
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return []; |
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} |
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$top = end($this->_stack); |
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return array_reduce($top->parents, function($additional, $current) { |
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return $current instanceof XmlFactoryCollocations |
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? array_merge($additional, $current->getXmlCollocations()) |
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: $additional; |
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}, $top instanceof XmlFactoryCollocations ? $top->getXmlCollocations() : []); |
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} |
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private function handleElementStart($name, $attrs) |
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{ |
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$element = $this->_element($name, $attrs); |
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if (count($this->_stack) > 1) { |
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end($this->_stack)->append($element); |
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} |
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$this->emit('parse.begin', [ $element ]); |
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$this->_stack[] = $element; |
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} |
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private function handleElementEnd() |
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{ |
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if (empty($this->_stack) === null) { |
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return; |
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} |
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$element = array_pop($this->_stack); |
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if (count($this->_stack) == 1) { |
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$this->emit('element', [ $element ]); |
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} |
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$this->emit('parse.end', [ $element ]); |
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} |
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private function handleTextData($data) |
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{ |
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if (trim($data)) { |
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end($this->_stack)->append($data); |
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} |
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} |
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} |
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kadet1090 /
nucleus
