<?php

/**

 * SimplePie

 *

 * A PHP-Based RSS and Atom Feed Framework.

 * Takes the hard work out of managing a complete RSS/Atom solution.

 *

 * Copyright (c) 2004-2016, Ryan Parman, Sam Sneddon, Ryan McCue, and contributors

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification, are

 * permitted provided that the following conditions are met:

 *

 * 	* Redistributions of source code must retain the above copyright notice, this list of

 * 	  conditions and the following disclaimer.

 *

 * 	* Redistributions in binary form must reproduce the above copyright notice, this list

 * 	  of conditions and the following disclaimer in the documentation and/or other materials

 * 	  provided with the distribution.

 *

 * 	* Neither the name of the SimplePie Team nor the names of its contributors may be used

 * 	  to endorse or promote products derived from this software without specific prior

 * 	  written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY

 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS

 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * @package SimplePie

 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue

 * @author Ryan Parman

 * @author Sam Sneddon

 * @author Ryan McCue

 * @link http://simplepie.org/ SimplePie

 * @license http://www.opensource.org/licenses/bsd-license.php BSD License

 */

/**

 * Parses XML into something sane

 *

 *

 * This class can be overloaded with {@see SimplePie::set_parser_class()}

 *

 * @package SimplePie

 * @subpackage Parsing

 */

class SimplePie_Parser

{

	var $error_code;

	var $error_string;

	var $current_line;

	var $current_column;

	var $current_byte;

	var $separator = ' ';

	var $namespace = array('');

	var $element = array('');

	var $xml_base = array('');

	var $xml_base_explicit = array(false);

	var $xml_lang = array('');

	var $data = array();

	var $datas = array(array());

	var $current_xhtml_construct = -1;

	var $encoding;

	protected $registry;

	public function set_registry(SimplePie_Registry $registry)

	{

		$this->registry = $registry;

	}

	public function parse(&$data, $encoding, $url = '')

	{

		if (class_exists('DOMXpath') && function_exists('Mf2\parse')) {

			$doc = new DOMDocument();

			@$doc->loadHTML($data);

			$xpath = new DOMXpath($doc);

			// Check for both h-feed and h-entry, as both a feed with no entries

			// and a list of entries without an h-feed wrapper are both valid.

			$query = '//*[contains(concat(" ", @class, " "), " h-feed ") or '.

				'contains(concat(" ", @class, " "), " h-entry ")]';

			$result = $xpath->query($query);

			if ($result->length !== 0) {

				return $this->parse_microformats($data, $url);

			}

		}

		// Use UTF-8 if we get passed US-ASCII, as every US-ASCII character is a UTF-8 character

		if (strtoupper($encoding) === 'US-ASCII')

		{

			$this->encoding = 'UTF-8';

		}

		else

		{

			$this->encoding = $encoding;

		}

		// Strip BOM:

		// UTF-32 Big Endian BOM

		if (substr($data, 0, 4) === "\x00\x00\xFE\xFF")

		{

			$data = substr($data, 4);

		}

		// UTF-32 Little Endian BOM

		elseif (substr($data, 0, 4) === "\xFF\xFE\x00\x00")

		{

			$data = substr($data, 4);

		}

		// UTF-16 Big Endian BOM

		elseif (substr($data, 0, 2) === "\xFE\xFF")

		{

			$data = substr($data, 2);

		}

		// UTF-16 Little Endian BOM

		elseif (substr($data, 0, 2) === "\xFF\xFE")

		{

			$data = substr($data, 2);

		}

		// UTF-8 BOM

		elseif (substr($data, 0, 3) === "\xEF\xBB\xBF")

		{

			$data = substr($data, 3);

		}

		if (substr($data, 0, 5) === '<?xml' && strspn(substr($data, 5, 1), "\x09\x0A\x0D\x20") && ($pos = strpos($data, '?>')) !== false)

		{

			$declaration = $this->registry->create('XML_Declaration_Parser', array(substr($data, 5, $pos - 5)));

			if ($declaration->parse())

			{

				$data = substr($data, $pos + 2);

				$data = '<?xml version="' . $declaration->version . '" encoding="' . $encoding . '" standalone="' . (($declaration->standalone) ? 'yes' : 'no') . '"?>' ."\n". $this->declare_html_entities() . $data;

			}

			else

			{

				$this->error_string = 'SimplePie bug! Please report this!';

				return false;

			}

		}

		$return = true;

		static $xml_is_sane = null;

		if ($xml_is_sane === null)

		{

			$parser_check = xml_parser_create();

			xml_parse_into_struct($parser_check, '<foo>&amp;</foo>', $values);

			xml_parser_free($parser_check);

			$xml_is_sane = isset($values[0]['value']);

		}

		// Create the parser

		if ($xml_is_sane)

		{

			$xml = xml_parser_create_ns($this->encoding, $this->separator);

			xml_parser_set_option($xml, XML_OPTION_SKIP_WHITE, 1);

			xml_parser_set_option($xml, XML_OPTION_CASE_FOLDING, 0);

			xml_set_object($xml, $this);

			xml_set_character_data_handler($xml, 'cdata');

			xml_set_element_handler($xml, 'tag_open', 'tag_close');

			// Parse!

			if (!xml_parse($xml, $data, true))

			{

				$this->error_code = xml_get_error_code($xml);

				$this->error_string = xml_error_string($this->error_code);

				$return = false;

			}

			$this->current_line = xml_get_current_line_number($xml);

			$this->current_column = xml_get_current_column_number($xml);

			$this->current_byte = xml_get_current_byte_index($xml);

			xml_parser_free($xml);

			return $return;

		}

		libxml_clear_errors();

		$xml = new XMLReader();

		$xml->xml($data);

		while (@$xml->read())

		{

			switch ($xml->nodeType)

			{

				case constant('XMLReader::END_ELEMENT'):

					if ($xml->namespaceURI !== '')

					{

						$tagName = $xml->namespaceURI . $this->separator . $xml->localName;

					}

					else

					{

						$tagName = $xml->localName;

					}

					$this->tag_close(null, $tagName);

					break;

				case constant('XMLReader::ELEMENT'):

					$empty = $xml->isEmptyElement;

					if ($xml->namespaceURI !== '')

					{

						$tagName = $xml->namespaceURI . $this->separator . $xml->localName;

					}

					else

					{

						$tagName = $xml->localName;

					}

					$attributes = array();

					while ($xml->moveToNextAttribute())

					{

						if ($xml->namespaceURI !== '')

						{

							$attrName = $xml->namespaceURI . $this->separator . $xml->localName;

						}

						else

						{

							$attrName = $xml->localName;

						}

						$attributes[$attrName] = $xml->value;

					}

					$this->tag_open(null, $tagName, $attributes);

					if ($empty)

					{

						$this->tag_close(null, $tagName);

					}

					break;

				case constant('XMLReader::TEXT'):

				case constant('XMLReader::CDATA'):

					$this->cdata(null, $xml->value);

					break;

			}

		}

		if ($error = libxml_get_last_error())

		{

			$this->error_code = $error->code;

			$this->error_string = $error->message;

			$this->current_line = $error->line;

			$this->current_column = $error->column;

			return false;

		}

		return true;

	}

	public function get_error_code()

	{

		return $this->error_code;

	}

	public function get_error_string()

	{

		return $this->error_string;

	}

	public function get_current_line()

	{

		return $this->current_line;

	}

	public function get_current_column()

	{

		return $this->current_column;

	}

	public function get_current_byte()

	{

		return $this->current_byte;

	}

	public function get_data()

	{

		return $this->data;

	}

	public function tag_open($parser, $tag, $attributes)

	{

		list($this->namespace[], $this->element[]) = $this->split_ns($tag);

		$attribs = array();

		foreach ($attributes as $name => $value)

		{

			list($attrib_namespace, $attribute) = $this->split_ns($name);

			$attribs[$attrib_namespace][$attribute] = $value;

		}

		if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['base']))

		{

			$base = $this->registry->call('Misc', 'absolutize_url', array($attribs[SIMPLEPIE_NAMESPACE_XML]['base'], end($this->xml_base)));

			if ($base !== false)

			{

				$this->xml_base[] = $base;

				$this->xml_base_explicit[] = true;

			}

		}

		else

		{

			$this->xml_base[] = end($this->xml_base);

			$this->xml_base_explicit[] = end($this->xml_base_explicit);

		}

		if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['lang']))

		{

			$this->xml_lang[] = $attribs[SIMPLEPIE_NAMESPACE_XML]['lang'];

		}

		else

		{

			$this->xml_lang[] = end($this->xml_lang);

		}

		if ($this->current_xhtml_construct >= 0)

		{

			$this->current_xhtml_construct++;

			if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML)

			{

				$this->data['data'] .= '<' . end($this->element);

				if (isset($attribs['']))

				{

					foreach ($attribs[''] as $name => $value)

					{

						$this->data['data'] .= ' ' . $name . '="' . htmlspecialchars($value, ENT_COMPAT, $this->encoding) . '"';

					}

				}

				$this->data['data'] .= '>';

			}

		}

		else

		{

			$this->datas[] =& $this->data;

			$this->data =& $this->data['child'][end($this->namespace)][end($this->element)][];

			$this->data = array('data' => '', 'attribs' => $attribs, 'xml_base' => end($this->xml_base), 'xml_base_explicit' => end($this->xml_base_explicit), 'xml_lang' => end($this->xml_lang));

			if ((end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_03 && in_array(end($this->element), array('title', 'tagline', 'copyright', 'info', 'summary', 'content')) && isset($attribs['']['mode']) && $attribs['']['mode'] === 'xml')

			|| (end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_10 && in_array(end($this->element), array('rights', 'subtitle', 'summary', 'info', 'title', 'content')) && isset($attribs['']['type']) && $attribs['']['type'] === 'xhtml')

			|| (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_20 && in_array(end($this->element), array('title')))

			|| (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_090 && in_array(end($this->element), array('title')))

			|| (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_10 && in_array(end($this->element), array('title'))))

			{

				$this->current_xhtml_construct = 0;

			}

		}

	}

	public function cdata($parser, $cdata)

	{

		if ($this->current_xhtml_construct >= 0)

		{

			$this->data['data'] .= htmlspecialchars($cdata, ENT_QUOTES, $this->encoding);

		}

		else

		{

			$this->data['data'] .= $cdata;

		}

	}

	public function tag_close($parser, $tag)

	{

		if ($this->current_xhtml_construct >= 0)

		{

			$this->current_xhtml_construct--;

			if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML && !in_array(end($this->element), array('area', 'base', 'basefont', 'br', 'col', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param')))

			{

				$this->data['data'] .= '</' . end($this->element) . '>';

			}

		}

		if ($this->current_xhtml_construct === -1)

		{

			$this->data =& $this->datas[count($this->datas) - 1];

			array_pop($this->datas);

		}

		array_pop($this->element);

		array_pop($this->namespace);

		array_pop($this->xml_base);

		array_pop($this->xml_base_explicit);

		array_pop($this->xml_lang);

	}

	public function split_ns($string)

	{

		static $cache = array();

		if (!isset($cache[$string]))

		{

			if ($pos = strpos($string, $this->separator))

			{

				static $separator_length;

				if (!$separator_length)

				{

					$separator_length = strlen($this->separator);

				}

				$namespace = substr($string, 0, $pos);

				$local_name = substr($string, $pos + $separator_length);

				if (strtolower($namespace) === SIMPLEPIE_NAMESPACE_ITUNES)

				{

					$namespace = SIMPLEPIE_NAMESPACE_ITUNES;

				}

				// Normalize the Media RSS namespaces