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/wp-includes/SimplePie/Parser.php

https://bitbucket.org/skyarch-iijima/wordpress
PHP | 407 lines | 319 code | 27 blank | 61 comment | 47 complexity | 52bb2ee462e7e414a77efdc7ebf52bcc MD5 | raw file
  1<?php
  2/**
  3 * SimplePie
  4 *
  5 * A PHP-Based RSS and Atom Feed Framework.
  6 * Takes the hard work out of managing a complete RSS/Atom solution.
  7 *
  8 * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
  9 * All rights reserved.
 10 *
 11 * Redistribution and use in source and binary forms, with or without modification, are
 12 * permitted provided that the following conditions are met:
 13 *
 14 * 	* Redistributions of source code must retain the above copyright notice, this list of
 15 * 	  conditions and the following disclaimer.
 16 *
 17 * 	* Redistributions in binary form must reproduce the above copyright notice, this list
 18 * 	  of conditions and the following disclaimer in the documentation and/or other materials
 19 * 	  provided with the distribution.
 20 *
 21 * 	* Neither the name of the SimplePie Team nor the names of its contributors may be used
 22 * 	  to endorse or promote products derived from this software without specific prior
 23 * 	  written permission.
 24 *
 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 26 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 27 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
 28 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 33 * POSSIBILITY OF SUCH DAMAGE.
 34 *
 35 * @package SimplePie
 36 * @version 1.3.1
 37 * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
 38 * @author Ryan Parman
 39 * @author Geoffrey Sneddon
 40 * @author Ryan McCue
 41 * @link http://simplepie.org/ SimplePie
 42 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 43 */
 44
 45/**
 46 * Parses XML into something sane
 47 *
 48 *
 49 * This class can be overloaded with {@see SimplePie::set_parser_class()}
 50 *
 51 * @package SimplePie
 52 * @subpackage Parsing
 53 */
 54class SimplePie_Parser
 55{
 56	var $error_code;
 57	var $error_string;
 58	var $current_line;
 59	var $current_column;
 60	var $current_byte;
 61	var $separator = ' ';
 62	var $namespace = array('');
 63	var $element = array('');
 64	var $xml_base = array('');
 65	var $xml_base_explicit = array(false);
 66	var $xml_lang = array('');
 67	var $data = array();
 68	var $datas = array(array());
 69	var $current_xhtml_construct = -1;
 70	var $encoding;
 71	protected $registry;
 72
 73	public function set_registry(SimplePie_Registry $registry)
 74	{
 75		$this->registry = $registry;
 76	}
 77
 78	public function parse(&$data, $encoding)
 79	{
 80		// Use UTF-8 if we get passed US-ASCII, as every US-ASCII character is a UTF-8 character
 81		if (strtoupper($encoding) === 'US-ASCII')
 82		{
 83			$this->encoding = 'UTF-8';
 84		}
 85		else
 86		{
 87			$this->encoding = $encoding;
 88		}
 89
 90		// Strip BOM:
 91		// UTF-32 Big Endian BOM
 92		if (substr($data, 0, 4) === "\x00\x00\xFE\xFF")
 93		{
 94			$data = substr($data, 4);
 95		}
 96		// UTF-32 Little Endian BOM
 97		elseif (substr($data, 0, 4) === "\xFF\xFE\x00\x00")
 98		{
 99			$data = substr($data, 4);
100		}
101		// UTF-16 Big Endian BOM
102		elseif (substr($data, 0, 2) === "\xFE\xFF")
103		{
104			$data = substr($data, 2);
105		}
106		// UTF-16 Little Endian BOM
107		elseif (substr($data, 0, 2) === "\xFF\xFE")
108		{
109			$data = substr($data, 2);
110		}
111		// UTF-8 BOM
112		elseif (substr($data, 0, 3) === "\xEF\xBB\xBF")
113		{
114			$data = substr($data, 3);
115		}
116
117		if (substr($data, 0, 5) === '<?xml' && strspn(substr($data, 5, 1), "\x09\x0A\x0D\x20") && ($pos = strpos($data, '?>')) !== false)
118		{
119			$declaration = $this->registry->create('XML_Declaration_Parser', array(substr($data, 5, $pos - 5)));
120			if ($declaration->parse())
121			{
122				$data = substr($data, $pos + 2);
123				$data = '<?xml version="' . $declaration->version . '" encoding="' . $encoding . '" standalone="' . (($declaration->standalone) ? 'yes' : 'no') . '"?>' . $data;
124			}
125			else
126			{
127				$this->error_string = 'SimplePie bug! Please report this!';
128				return false;
129			}
130		}
131
132		$return = true;
133
134		static $xml_is_sane = null;
135		if ($xml_is_sane === null)
136		{
137			$parser_check = xml_parser_create();
138			xml_parse_into_struct($parser_check, '<foo>&amp;</foo>', $values);
139			xml_parser_free($parser_check);
140			$xml_is_sane = isset($values[0]['value']);
141		}
142
143		// Create the parser
144		if ($xml_is_sane)
145		{
146			$xml = xml_parser_create_ns($this->encoding, $this->separator);
147			xml_parser_set_option($xml, XML_OPTION_SKIP_WHITE, 1);
148			xml_parser_set_option($xml, XML_OPTION_CASE_FOLDING, 0);
149			xml_set_object($xml, $this);
150			xml_set_character_data_handler($xml, 'cdata');
151			xml_set_element_handler($xml, 'tag_open', 'tag_close');
152
153			// Parse!
154			if (!xml_parse($xml, $data, true))
155			{
156				$this->error_code = xml_get_error_code($xml);
157				$this->error_string = xml_error_string($this->error_code);
158				$return = false;
159			}
160			$this->current_line = xml_get_current_line_number($xml);
161			$this->current_column = xml_get_current_column_number($xml);
162			$this->current_byte = xml_get_current_byte_index($xml);
163			xml_parser_free($xml);
164			return $return;
165		}
166		else
167		{
168			libxml_clear_errors();
169			$xml = new XMLReader();
170			$xml->xml($data);
171			while (@$xml->read())
172			{
173				switch ($xml->nodeType)
174				{
175
176					case constant('XMLReader::END_ELEMENT'):
177						if ($xml->namespaceURI !== '')
178						{
179							$tagName = $xml->namespaceURI . $this->separator . $xml->localName;
180						}
181						else
182						{
183							$tagName = $xml->localName;
184						}
185						$this->tag_close(null, $tagName);
186						break;
187					case constant('XMLReader::ELEMENT'):
188						$empty = $xml->isEmptyElement;
189						if ($xml->namespaceURI !== '')
190						{
191							$tagName = $xml->namespaceURI . $this->separator . $xml->localName;
192						}
193						else
194						{
195							$tagName = $xml->localName;
196						}
197						$attributes = array();
198						while ($xml->moveToNextAttribute())
199						{
200							if ($xml->namespaceURI !== '')
201							{
202								$attrName = $xml->namespaceURI . $this->separator . $xml->localName;
203							}
204							else
205							{
206								$attrName = $xml->localName;
207							}
208							$attributes[$attrName] = $xml->value;
209						}
210						$this->tag_open(null, $tagName, $attributes);
211						if ($empty)
212						{
213							$this->tag_close(null, $tagName);
214						}
215						break;
216					case constant('XMLReader::TEXT'):
217
218					case constant('XMLReader::CDATA'):
219						$this->cdata(null, $xml->value);
220						break;
221				}
222			}
223			if ($error = libxml_get_last_error())
224			{
225				$this->error_code = $error->code;
226				$this->error_string = $error->message;
227				$this->current_line = $error->line;
228				$this->current_column = $error->column;
229				return false;
230			}
231			else
232			{
233				return true;
234			}
235		}
236	}
237
238	public function get_error_code()
239	{
240		return $this->error_code;
241	}
242
243	public function get_error_string()
244	{
245		return $this->error_string;
246	}
247
248	public function get_current_line()
249	{
250		return $this->current_line;
251	}
252
253	public function get_current_column()
254	{
255		return $this->current_column;
256	}
257
258	public function get_current_byte()
259	{
260		return $this->current_byte;
261	}
262
263	public function get_data()
264	{
265		return $this->data;
266	}
267
268	public function tag_open($parser, $tag, $attributes)
269	{
270		list($this->namespace[], $this->element[]) = $this->split_ns($tag);
271
272		$attribs = array();
273		foreach ($attributes as $name => $value)
274		{
275			list($attrib_namespace, $attribute) = $this->split_ns($name);
276			$attribs[$attrib_namespace][$attribute] = $value;
277		}
278
279		if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['base']))
280		{
281			$base = $this->registry->call('Misc', 'absolutize_url', array($attribs[SIMPLEPIE_NAMESPACE_XML]['base'], end($this->xml_base)));
282			if ($base !== false)
283			{
284				$this->xml_base[] = $base;
285				$this->xml_base_explicit[] = true;
286			}
287		}
288		else
289		{
290			$this->xml_base[] = end($this->xml_base);
291			$this->xml_base_explicit[] = end($this->xml_base_explicit);
292		}
293
294		if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['lang']))
295		{
296			$this->xml_lang[] = $attribs[SIMPLEPIE_NAMESPACE_XML]['lang'];
297		}
298		else
299		{
300			$this->xml_lang[] = end($this->xml_lang);
301		}
302
303		if ($this->current_xhtml_construct >= 0)
304		{
305			$this->current_xhtml_construct++;
306			if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML)
307			{
308				$this->data['data'] .= '<' . end($this->element);
309				if (isset($attribs['']))
310				{
311					foreach ($attribs[''] as $name => $value)
312					{
313						$this->data['data'] .= ' ' . $name . '="' . htmlspecialchars($value, ENT_COMPAT, $this->encoding) . '"';
314					}
315				}
316				$this->data['data'] .= '>';
317			}
318		}
319		else
320		{
321			$this->datas[] =& $this->data;
322			$this->data =& $this->data['child'][end($this->namespace)][end($this->element)][];
323			$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));
324			if ((end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_03 && in_array(end($this->element), array('title', 'tagline', 'copyright', 'info', 'summary', 'content')) && isset($attribs['']['mode']) && $attribs['']['mode'] === 'xml')
325			|| (end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_10 && in_array(end($this->element), array('rights', 'subtitle', 'summary', 'info', 'title', 'content')) && isset($attribs['']['type']) && $attribs['']['type'] === 'xhtml')
326			|| (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_20 && in_array(end($this->element), array('title')))
327			|| (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_090 && in_array(end($this->element), array('title')))
328			|| (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_10 && in_array(end($this->element), array('title'))))
329			{
330				$this->current_xhtml_construct = 0;
331			}
332		}
333	}
334
335	public function cdata($parser, $cdata)
336	{
337		if ($this->current_xhtml_construct >= 0)
338		{
339			$this->data['data'] .= htmlspecialchars($cdata, ENT_QUOTES, $this->encoding);
340		}
341		else
342		{
343			$this->data['data'] .= $cdata;
344		}
345	}
346
347	public function tag_close($parser, $tag)
348	{
349		if ($this->current_xhtml_construct >= 0)
350		{
351			$this->current_xhtml_construct--;
352			if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML && !in_array(end($this->element), array('area', 'base', 'basefont', 'br', 'col', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param')))
353			{
354				$this->data['data'] .= '</' . end($this->element) . '>';
355			}
356		}
357		if ($this->current_xhtml_construct === -1)
358		{
359			$this->data =& $this->datas[count($this->datas) - 1];
360			array_pop($this->datas);
361		}
362
363		array_pop($this->element);
364		array_pop($this->namespace);
365		array_pop($this->xml_base);
366		array_pop($this->xml_base_explicit);
367		array_pop($this->xml_lang);
368	}
369
370	public function split_ns($string)
371	{
372		static $cache = array();
373		if (!isset($cache[$string]))
374		{
375			if ($pos = strpos($string, $this->separator))
376			{
377				static $separator_length;
378				if (!$separator_length)
379				{
380					$separator_length = strlen($this->separator);
381				}
382				$namespace = substr($string, 0, $pos);
383				$local_name = substr($string, $pos + $separator_length);
384				if (strtolower($namespace) === SIMPLEPIE_NAMESPACE_ITUNES)
385				{
386					$namespace = SIMPLEPIE_NAMESPACE_ITUNES;
387				}
388
389				// Normalize the Media RSS namespaces
390				if ($namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG ||
391					$namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG2 ||
392					$namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG3 ||
393					$namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG4 ||
394					$namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG5 )
395				{
396					$namespace = SIMPLEPIE_NAMESPACE_MEDIARSS;
397				}
398				$cache[$string] = array($namespace, $local_name);
399			}
400			else
401			{
402				$cache[$string] = array('', $string);
403			}
404		}
405		return $cache[$string];
406	}
407}