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/wp-includes/SimplePie/ -> Parser.php (source)

   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) 2004-2016, Ryan Parman, Sam 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   * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue
  37   * @author Ryan Parman
  38   * @author Sam Sneddon
  39   * @author Ryan McCue
  40   * @link http://simplepie.org/ SimplePie
  41   * @license http://www.opensource.org/licenses/bsd-license.php BSD License
  42   */
  43  
  44  /**
  45   * Parses XML into something sane
  46   *
  47   *
  48   * This class can be overloaded with {@see SimplePie::set_parser_class()}
  49   *
  50   * @package SimplePie
  51   * @subpackage Parsing
  52   */
  53  class SimplePie_Parser
  54  {
  55      var $error_code;
  56      var $error_string;
  57      var $current_line;
  58      var $current_column;
  59      var $current_byte;
  60      var $separator = ' ';
  61      var $namespace = array('');
  62      var $element = array('');
  63      var $xml_base = array('');
  64      var $xml_base_explicit = array(false);
  65      var $xml_lang = array('');
  66      var $data = array();
  67      var $datas = array(array());
  68      var $current_xhtml_construct = -1;
  69      var $encoding;
  70      protected $registry;
  71  
  72  	public function set_registry(SimplePie_Registry $registry)
  73      {
  74          $this->registry = $registry;
  75      }
  76  
  77  	public function parse(&$data, $encoding, $url = '')
  78      {
  79          if (class_exists('DOMXpath') && function_exists('Mf2\parse')) {
  80              $doc = new DOMDocument();
  81              @$doc->loadHTML($data);
  82              $xpath = new DOMXpath($doc);
  83              // Check for both h-feed and h-entry, as both a feed with no entries
  84              // and a list of entries without an h-feed wrapper are both valid.
  85              $query = '//*[contains(concat(" ", @class, " "), " h-feed ") or '.
  86                  'contains(concat(" ", @class, " "), " h-entry ")]';
  87              $result = $xpath->query($query);
  88              if ($result->length !== 0) {
  89                  return $this->parse_microformats($data, $url);
  90              }
  91          }
  92  
  93          // Use UTF-8 if we get passed US-ASCII, as every US-ASCII character is a UTF-8 character
  94          if (strtoupper($encoding) === 'US-ASCII')
  95          {
  96              $this->encoding = 'UTF-8';
  97          }
  98          else
  99          {
 100              $this->encoding = $encoding;
 101          }
 102  
 103          // Strip BOM:
 104          // UTF-32 Big Endian BOM
 105          if (substr($data, 0, 4) === "\x00\x00\xFE\xFF")
 106          {
 107              $data = substr($data, 4);
 108          }
 109          // UTF-32 Little Endian BOM
 110          elseif (substr($data, 0, 4) === "\xFF\xFE\x00\x00")
 111          {
 112              $data = substr($data, 4);
 113          }
 114          // UTF-16 Big Endian BOM
 115          elseif (substr($data, 0, 2) === "\xFE\xFF")
 116          {
 117              $data = substr($data, 2);
 118          }
 119          // UTF-16 Little Endian BOM
 120          elseif (substr($data, 0, 2) === "\xFF\xFE")
 121          {
 122              $data = substr($data, 2);
 123          }
 124          // UTF-8 BOM
 125          elseif (substr($data, 0, 3) === "\xEF\xBB\xBF")
 126          {
 127              $data = substr($data, 3);
 128          }
 129  
 130          if (substr($data, 0, 5) === '<?xml' && strspn(substr($data, 5, 1), "\x09\x0A\x0D\x20") && ($pos = strpos($data, '?>')) !== false)
 131          {
 132              $declaration = $this->registry->create('XML_Declaration_Parser', array(substr($data, 5, $pos - 5)));
 133              if ($declaration->parse())
 134              {
 135                  $data = substr($data, $pos + 2);
 136                  $data = '<?xml version="' . $declaration->version . '" encoding="' . $encoding . '" standalone="' . (($declaration->standalone) ? 'yes' : 'no') . '"?>' ."\n". $this->declare_html_entities() . $data;
 137              }
 138              else
 139              {
 140                  $this->error_string = 'SimplePie bug! Please report this!';
 141                  return false;
 142              }
 143          }
 144  
 145          $return = true;
 146  
 147          static $xml_is_sane = null;
 148          if ($xml_is_sane === null)
 149          {
 150              $parser_check = xml_parser_create();
 151              xml_parse_into_struct($parser_check, '<foo>&amp;</foo>', $values);
 152              xml_parser_free($parser_check);
 153              $xml_is_sane = isset($values[0]['value']);
 154          }
 155  
 156          // Create the parser
 157          if ($xml_is_sane)
 158          {
 159              $xml = xml_parser_create_ns($this->encoding, $this->separator);
 160              xml_parser_set_option($xml, XML_OPTION_SKIP_WHITE, 1);
 161              xml_parser_set_option($xml, XML_OPTION_CASE_FOLDING, 0);
 162              xml_set_object($xml, $this);
 163              xml_set_character_data_handler($xml, 'cdata');
 164              xml_set_element_handler($xml, 'tag_open', 'tag_close');
 165  
 166              // Parse!
 167              $wrapper = @is_writable(sys_get_temp_dir()) ? 'php://temp' : 'php://memory';
 168              if (($stream = fopen($wrapper, 'r+')) &&
 169                  fwrite($stream, $data) &&
 170                  rewind($stream))
 171              {
 172                  //Parse by chunks not to use too much memory
 173                  do
 174                  {
 175                      $stream_data = fread($stream, 1048576);
 176                      if (!xml_parse($xml, $stream_data === false ? '' : $stream_data, feof($stream)))
 177                      {
 178                          $this->error_code = xml_get_error_code($xml);
 179                          $this->error_string = xml_error_string($this->error_code);
 180                          $return = false;
 181                          break;
 182                      }
 183                  } while (!feof($stream));
 184                  fclose($stream);
 185              }
 186              else
 187              {
 188                  $return = false;
 189              }
 190  
 191              $this->current_line = xml_get_current_line_number($xml);
 192              $this->current_column = xml_get_current_column_number($xml);
 193              $this->current_byte = xml_get_current_byte_index($xml);
 194              xml_parser_free($xml);
 195              return $return;
 196          }
 197  
 198          libxml_clear_errors();
 199          $xml = new XMLReader();
 200          $xml->xml($data);
 201          while (@$xml->read())
 202          {
 203              switch ($xml->nodeType)
 204              {
 205  
 206                  case constant('XMLReader::END_ELEMENT'):
 207                      if ($xml->namespaceURI !== '')
 208                      {
 209                          $tagName = $xml->namespaceURI . $this->separator . $xml->localName;
 210                      }
 211                      else
 212                      {
 213                          $tagName = $xml->localName;
 214                      }
 215                      $this->tag_close(null, $tagName);
 216                      break;
 217                  case constant('XMLReader::ELEMENT'):
 218                      $empty = $xml->isEmptyElement;
 219                      if ($xml->namespaceURI !== '')
 220                      {
 221                          $tagName = $xml->namespaceURI . $this->separator . $xml->localName;
 222                      }
 223                      else
 224                      {
 225                          $tagName = $xml->localName;
 226                      }
 227                      $attributes = array();
 228                      while ($xml->moveToNextAttribute())
 229                      {
 230                          if ($xml->namespaceURI !== '')
 231                          {
 232                              $attrName = $xml->namespaceURI . $this->separator . $xml->localName;
 233                          }
 234                          else
 235                          {
 236                              $attrName = $xml->localName;
 237                          }
 238                          $attributes[$attrName] = $xml->value;
 239                      }
 240                      $this->tag_open(null, $tagName, $attributes);
 241                      if ($empty)
 242                      {
 243                          $this->tag_close(null, $tagName);
 244                      }
 245                      break;
 246                  case constant('XMLReader::TEXT'):
 247  
 248                  case constant('XMLReader::CDATA'):
 249                      $this->cdata(null, $xml->value);
 250                      break;
 251              }
 252          }
 253          if ($error = libxml_get_last_error())
 254          {
 255              $this->error_code = $error->code;
 256              $this->error_string = $error->message;
 257              $this->current_line = $error->line;
 258              $this->current_column = $error->column;
 259              return false;
 260          }
 261  
 262          return true;
 263      }
 264  
 265      public function get_error_code()
 266      {
 267          return $this->error_code;
 268      }
 269  
 270      public function get_error_string()
 271      {
 272          return $this->error_string;
 273      }
 274  
 275      public function get_current_line()
 276      {
 277          return $this->current_line;
 278      }
 279  
 280      public function get_current_column()
 281      {
 282          return $this->current_column;
 283      }
 284  
 285      public function get_current_byte()
 286      {
 287          return $this->current_byte;
 288      }
 289  
 290      public function get_data()
 291      {
 292          return $this->data;
 293      }
 294  
 295      public function tag_open($parser, $tag, $attributes)
 296      {
 297          list($this->namespace[], $this->element[]) = $this->split_ns($tag);
 298  
 299          $attribs = array();
 300          foreach ($attributes as $name => $value)
 301          {
 302              list($attrib_namespace, $attribute) = $this->split_ns($name);
 303              $attribs[$attrib_namespace][$attribute] = $value;
 304          }
 305  
 306          if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['base']))
 307          {
 308              $base = $this->registry->call('Misc', 'absolutize_url', array($attribs[SIMPLEPIE_NAMESPACE_XML]['base'], end($this->xml_base)));
 309              if ($base !== false)
 310              {
 311                  $this->xml_base[] = $base;
 312                  $this->xml_base_explicit[] = true;
 313              }
 314          }
 315          else
 316          {
 317              $this->xml_base[] = end($this->xml_base);
 318              $this->xml_base_explicit[] = end($this->xml_base_explicit);
 319          }
 320  
 321          if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['lang']))
 322          {
 323              $this->xml_lang[] = $attribs[SIMPLEPIE_NAMESPACE_XML]['lang'];
 324          }
 325          else
 326          {
 327              $this->xml_lang[] = end($this->xml_lang);
 328          }
 329  
 330          if ($this->current_xhtml_construct >= 0)
 331          {
 332              $this->current_xhtml_construct++;
 333              if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML)
 334              {
 335                  $this->data['data'] .= '<' . end($this->element);
 336                  if (isset($attribs['']))
 337                  {
 338                      foreach ($attribs[''] as $name => $value)
 339                      {
 340                          $this->data['data'] .= ' ' . $name . '="' . htmlspecialchars($value, ENT_COMPAT, $this->encoding) . '"';
 341                      }
 342                  }
 343                  $this->data['data'] .= '>';
 344              }
 345          }
 346          else
 347          {
 348              $this->datas[] =& $this->data;
 349              $this->data =& $this->data['child'][end($this->namespace)][end($this->element)][];
 350              $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));
 351              if ((end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_03 && in_array(end($this->element), array('title', 'tagline', 'copyright', 'info', 'summary', 'content')) && isset($attribs['']['mode']) && $attribs['']['mode'] === 'xml')
 352              || (end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_10 && in_array(end($this->element), array('rights', 'subtitle', 'summary', 'info', 'title', 'content')) && isset($attribs['']['type']) && $attribs['']['type'] === 'xhtml')
 353              || (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_20 && in_array(end($this->element), array('title')))
 354              || (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_090 && in_array(end($this->element), array('title')))
 355              || (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_10 && in_array(end($this->element), array('title'))))
 356              {
 357                  $this->current_xhtml_construct = 0;
 358              }
 359          }
 360      }
 361  
 362      public function cdata($parser, $cdata)
 363      {
 364          if ($this->current_xhtml_construct >= 0)
 365          {
 366              $this->data['data'] .= htmlspecialchars($cdata, ENT_QUOTES, $this->encoding);
 367          }
 368          else
 369          {
 370              $this->data['data'] .= $cdata;
 371          }
 372      }
 373  
 374      public function tag_close($parser, $tag)
 375      {
 376          if ($this->current_xhtml_construct >= 0)
 377          {
 378              $this->current_xhtml_construct--;
 379              if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML && !in_array(end($this->element), array('area', 'base', 'basefont', 'br', 'col', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param')))
 380              {
 381                  $this->data['data'] .= '</' . end($this->element) . '>';
 382              }
 383          }
 384          if ($this->current_xhtml_construct === -1)
 385          {
 386              $this->data =& $this->datas[count($this->datas) - 1];
 387              array_pop($this->datas);
 388          }
 389  
 390          array_pop($this->element);
 391          array_pop($this->namespace);
 392          array_pop($this->xml_base);
 393          array_pop($this->xml_base_explicit);
 394          array_pop($this->xml_lang);
 395      }
 396  
 397      public function split_ns($string)
 398      {
 399          static $cache = array();
 400          if (!isset($cache[$string]))
 401          {
 402              if ($pos = strpos($string, $this->separator))
 403              {
 404                  static $separator_length;
 405                  if (!$separator_length)
 406                  {
 407                      $separator_length = strlen($this->separator);
 408                  }
 409                  $namespace = substr($string, 0, $pos);
 410                  $local_name = substr($string, $pos + $separator_length);
 411                  if (strtolower($namespace) === SIMPLEPIE_NAMESPACE_ITUNES)
 412                  {
 413                      $namespace = SIMPLEPIE_NAMESPACE_ITUNES;
 414                  }
 415  
 416                  // Normalize the Media RSS namespaces
 417                  if ($namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG ||
 418                      $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG2 ||
 419                      $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG3 ||
 420                      $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG4 ||
 421                      $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG5 )
 422                  {
 423                      $namespace = SIMPLEPIE_NAMESPACE_MEDIARSS;
 424                  }
 425                  $cache[$string] = array($namespace, $local_name);
 426              }
 427              else
 428              {
 429                  $cache[$string] = array('', $string);
 430              }
 431          }
 432          return $cache[$string];
 433      }
 434  
 435      private function parse_hcard($data, $category = false) {
 436          $name = '';
 437          $link = '';
 438          // Check if h-card is set and pass that information on in the link.
 439          if (isset($data['type']) && in_array('h-card', $data['type'])) {
 440              if (isset($data['properties']['name'][0])) {
 441                  $name = $data['properties']['name'][0];
 442              }
 443              if (isset($data['properties']['url'][0])) {
 444                  $link = $data['properties']['url'][0];
 445                  if ($name === '') {
 446                      $name = $link;
 447                  }
 448                  else {
 449                      // can't have commas in categories.
 450                      $name = str_replace(',', '', $name);
 451                  }
 452                  $person_tag = $category ? '<span class="person-tag"></span>' : '';
 453                  return '<a class="h-card" href="'.$link.'">'.$person_tag.$name.'</a>';
 454              }
 455          }
 456          return isset($data['value']) ? $data['value'] : '';
 457      }
 458  
 459      private function parse_microformats(&$data, $url) {
 460          $feed_title = '';
 461          $feed_author = NULL;
 462          $author_cache = array();
 463          $items = array();
 464          $entries = array();
 465          $mf = Mf2\parse($data, $url);
 466          // First look for an h-feed.
 467          $h_feed = array();
 468          foreach ($mf['items'] as $mf_item) {
 469              if (in_array('h-feed', $mf_item['type'])) {
 470                  $h_feed = $mf_item;
 471                  break;
 472              }
 473              // Also look for h-feed or h-entry in the children of each top level item.
 474              if (!isset($mf_item['children'][0]['type'])) continue;
 475              if (in_array('h-feed', $mf_item['children'][0]['type'])) {
 476                  $h_feed = $mf_item['children'][0];
 477                  // In this case the parent of the h-feed may be an h-card, so use it as
 478                  // the feed_author.
 479                  if (in_array('h-card', $mf_item['type'])) $feed_author = $mf_item;
 480                  break;
 481              }
 482              else if (in_array('h-entry', $mf_item['children'][0]['type'])) {
 483                  $entries = $mf_item['children'];
 484                  // In this case the parent of the h-entry list may be an h-card, so use
 485                  // it as the feed_author.
 486                  if (in_array('h-card', $mf_item['type'])) $feed_author = $mf_item;
 487                  break;
 488              }
 489          }
 490          if (isset($h_feed['children'])) {
 491              $entries = $h_feed['children'];
 492              // Also set the feed title and store author from the h-feed if available.
 493              if (isset($mf['items'][0]['properties']['name'][0])) {
 494                  $feed_title = $mf['items'][0]['properties']['name'][0];
 495              }
 496              if (isset($mf['items'][0]['properties']['author'][0])) {
 497                  $feed_author = $mf['items'][0]['properties']['author'][0];
 498              }
 499          }
 500          else if (count($entries) === 0) {
 501              $entries = $mf['items'];
 502          }
 503          for ($i = 0; $i < count($entries); $i++) {
 504              $entry = $entries[$i];
 505              if (in_array('h-entry', $entry['type'])) {
 506                  $item = array();
 507                  $title = '';
 508                  $description = '';
 509                  if (isset($entry['properties']['url'][0])) {
 510                      $link = $entry['properties']['url'][0];
 511                      if (isset($link['value'])) $link = $link['value'];
 512                      $item['link'] = array(array('data' => $link));
 513                  }
 514                  if (isset($entry['properties']['uid'][0])) {
 515                      $guid = $entry['properties']['uid'][0];
 516                      if (isset($guid['value'])) $guid = $guid['value'];
 517                      $item['guid'] = array(array('data' => $guid));
 518                  }
 519                  if (isset($entry['properties']['name'][0])) {
 520                      $title = $entry['properties']['name'][0];
 521                      if (isset($title['value'])) $title = $title['value'];
 522                      $item['title'] = array(array('data' => $title));
 523                  }
 524                  if (isset($entry['properties']['author'][0]) || isset($feed_author)) {
 525                      // author is a special case, it can be plain text or an h-card array.
 526                      // If it's plain text it can also be a url that should be followed to
 527                      // get the actual h-card.
 528                      $author = isset($entry['properties']['author'][0]) ?
 529                          $entry['properties']['author'][0] : $feed_author;
 530                      if (!is_string($author)) {
 531                          $author = $this->parse_hcard($author);
 532                      }
 533                      else if (strpos($author, 'http') === 0) {
 534                          if (isset($author_cache[$author])) {
 535                              $author = $author_cache[$author];
 536                          }
 537                          else {
 538                              $mf = Mf2\fetch($author);
 539                              foreach ($mf['items'] as $hcard) {
 540                                  // Only interested in an h-card by itself in this case.
 541                                  if (!in_array('h-card', $hcard['type'])) {
 542                                      continue;
 543                                  }
 544                                  // It must have a url property matching what we fetched.
 545                                  if (!isset($hcard['properties']['url']) ||
 546                                          !(in_array($author, $hcard['properties']['url']))) {
 547                                      continue;
 548                                  }
 549                                  // Save parse_hcard the trouble of finding the correct url.
 550                                  $hcard['properties']['url'][0] = $author;
 551                                  // Cache this h-card for the next h-entry to check.
 552                                  $author_cache[$author] = $this->parse_hcard($hcard);
 553                                  $author = $author_cache[$author];
 554                                  break;
 555                              }
 556                          }
 557                      }
 558                      $item['author'] = array(array('data' => $author));
 559                  }
 560                  if (isset($entry['properties']['photo'][0])) {
 561                      // If a photo is also in content, don't need to add it again here.
 562                      $content = '';
 563                      if (isset($entry['properties']['content'][0]['html'])) {
 564                          $content = $entry['properties']['content'][0]['html'];
 565                      }
 566                      $photo_list = array();
 567                      for ($j = 0; $j < count($entry['properties']['photo']); $j++) {
 568                          $photo = $entry['properties']['photo'][$j];
 569                          if (!empty($photo) && strpos($content, $photo) === false) {
 570                              $photo_list[] = $photo;
 571                          }
 572                      }
 573                      // When there's more than one photo show the first and use a lightbox.
 574                      // Need a permanent, unique name for the image set, but don't have
 575                      // anything unique except for the content itself, so use that.
 576                      $count = count($photo_list);
 577                      if ($count > 1) {
 578                          $image_set_id = preg_replace('/[[:^alnum:]]/', '', $photo_list[0]);
 579                          $description = '<p>';
 580                          for ($j = 0; $j < $count; $j++) {
 581                              $hidden = $j === 0 ? '' : 'class="hidden" ';
 582                              $description .= '<a href="'.$photo_list[$j].'" '.$hidden.
 583                                  'data-lightbox="image-set-'.$image_set_id.'">'.
 584                                  '<img src="'.$photo_list[$j].'"></a>';
 585                          }
 586                          $description .= '<br><b>'.$count.' photos</b></p>';
 587                      }
 588                      else if ($count == 1) {
 589                          $description = '<p><img src="'.$photo_list[0].'"></p>';
 590                      }
 591                  }
 592                  if (isset($entry['properties']['content'][0]['html'])) {
 593                      // e-content['value'] is the same as p-name when they are on the same
 594                      // element. Use this to replace title with a strip_tags version so
 595                      // that alt text from images is not included in the title.
 596                      if ($entry['properties']['content'][0]['value'] === $title) {
 597                          $title = strip_tags($entry['properties']['content'][0]['html']);
 598                          $item['title'] = array(array('data' => $title));
 599                      }
 600                      $description .= $entry['properties']['content'][0]['html'];
 601                      if (isset($entry['properties']['in-reply-to'][0])) {
 602                          $in_reply_to = '';
 603                          if (is_string($entry['properties']['in-reply-to'][0])) {
 604                              $in_reply_to = $entry['properties']['in-reply-to'][0];
 605                          }
 606                          else if (isset($entry['properties']['in-reply-to'][0]['value'])) {
 607                              $in_reply_to = $entry['properties']['in-reply-to'][0]['value'];
 608                          }
 609                          if ($in_reply_to !== '') {
 610                              $description .= '<p><span class="in-reply-to"></span> '.
 611                                  '<a href="'.$in_reply_to.'">'.$in_reply_to.'</a><p>';
 612                          }
 613                      }
 614                      $item['description'] = array(array('data' => $description));
 615                  }
 616                  if (isset($entry['properties']['category'])) {
 617                      $category_csv = '';
 618                      // Categories can also contain h-cards.
 619                      foreach ($entry['properties']['category'] as $category) {
 620                          if ($category_csv !== '') $category_csv .= ', ';
 621                          if (is_string($category)) {
 622                              // Can't have commas in categories.
 623                              $category_csv .= str_replace(',', '', $category);
 624                          }
 625                          else {
 626                              $category_csv .= $this->parse_hcard($category, true);
 627                          }
 628                      }
 629                      $item['category'] = array(array('data' => $category_csv));
 630                  }
 631                  if (isset($entry['properties']['published'][0])) {
 632                      $timestamp = strtotime($entry['properties']['published'][0]);
 633                      $pub_date = date('F j Y g:ia', $timestamp).' GMT';
 634                      $item['pubDate'] = array(array('data' => $pub_date));
 635                  }
 636                  // The title and description are set to the empty string to represent
 637                  // a deleted item (which also makes it an invalid rss item).
 638                  if (isset($entry['properties']['deleted'][0])) {
 639                      $item['title'] = array(array('data' => ''));
 640                      $item['description'] = array(array('data' => ''));
 641                  }
 642                  $items[] = array('child' => array('' => $item));
 643              }
 644          }
 645          // Mimic RSS data format when storing microformats.
 646          $link = array(array('data' => $url));
 647          $image = '';
 648          if (!is_string($feed_author) &&
 649                  isset($feed_author['properties']['photo'][0])) {
 650              $image = array(array('child' => array('' => array('url' =>
 651                  array(array('data' => $feed_author['properties']['photo'][0]))))));
 652          }
 653          // Use the name given for the h-feed, or get the title from the html.
 654          if ($feed_title !== '') {
 655              $feed_title = array(array('data' => htmlspecialchars($feed_title)));
 656          }
 657          else if ($position = strpos($data, '<title>')) {
 658              $start = $position < 200 ? 0 : $position - 200;
 659              $check = substr($data, $start, 400);
 660              $matches = array();
 661              if (preg_match('/<title>(.+)<\/title>/', $check, $matches)) {
 662                  $feed_title = array(array('data' => htmlspecialchars($matches[1])));
 663              }
 664          }
 665          $channel = array('channel' => array(array('child' => array('' =>
 666              array('link' => $link, 'image' => $image, 'title' => $feed_title,
 667                    'item' => $items)))));
 668          $rss = array(array('attribs' => array('' => array('version' => '2.0')),
 669                             'child' => array('' => $channel)));
 670          $this->data = array('child' => array('' => array('rss' => $rss)));
 671          return true;
 672      }
 673  
 674      private function declare_html_entities() {
 675          // This is required because the RSS specification says that entity-encoded
 676          // html is allowed, but the xml specification says they must be declared.
 677          return '<!DOCTYPE html [ <!ENTITY nbsp "&#x00A0;"> <!ENTITY iexcl "&#x00A1;"> <!ENTITY cent "&#x00A2;"> <!ENTITY pound "&#x00A3;"> <!ENTITY curren "&#x00A4;"> <!ENTITY yen "&#x00A5;"> <!ENTITY brvbar "&#x00A6;"> <!ENTITY sect "&#x00A7;"> <!ENTITY uml "&#x00A8;"> <!ENTITY copy "&#x00A9;"> <!ENTITY ordf "&#x00AA;"> <!ENTITY laquo "&#x00AB;"> <!ENTITY not "&#x00AC;"> <!ENTITY shy "&#x00AD;"> <!ENTITY reg "&#x00AE;"> <!ENTITY macr "&#x00AF;"> <!ENTITY deg "&#x00B0;"> <!ENTITY plusmn "&#x00B1;"> <!ENTITY sup2 "&#x00B2;"> <!ENTITY sup3 "&#x00B3;"> <!ENTITY acute "&#x00B4;"> <!ENTITY micro "&#x00B5;"> <!ENTITY para "&#x00B6;"> <!ENTITY middot "&#x00B7;"> <!ENTITY cedil "&#x00B8;"> <!ENTITY sup1 "&#x00B9;"> <!ENTITY ordm "&#x00BA;"> <!ENTITY raquo "&#x00BB;"> <!ENTITY frac14 "&#x00BC;"> <!ENTITY frac12 "&#x00BD;"> <!ENTITY frac34 "&#x00BE;"> <!ENTITY iquest "&#x00BF;"> <!ENTITY Agrave "&#x00C0;"> <!ENTITY Aacute "&#x00C1;"> <!ENTITY Acirc "&#x00C2;"> <!ENTITY Atilde "&#x00C3;"> <!ENTITY Auml "&#x00C4;"> <!ENTITY Aring "&#x00C5;"> <!ENTITY AElig "&#x00C6;"> <!ENTITY Ccedil "&#x00C7;"> <!ENTITY Egrave "&#x00C8;"> <!ENTITY Eacute "&#x00C9;"> <!ENTITY Ecirc "&#x00CA;"> <!ENTITY Euml "&#x00CB;"> <!ENTITY Igrave "&#x00CC;"> <!ENTITY Iacute "&#x00CD;"> <!ENTITY Icirc "&#x00CE;"> <!ENTITY Iuml "&#x00CF;"> <!ENTITY ETH "&#x00D0;"> <!ENTITY Ntilde "&#x00D1;"> <!ENTITY Ograve "&#x00D2;"> <!ENTITY Oacute "&#x00D3;"> <!ENTITY Ocirc "&#x00D4;"> <!ENTITY Otilde "&#x00D5;"> <!ENTITY Ouml "&#x00D6;"> <!ENTITY times "&#x00D7;"> <!ENTITY Oslash "&#x00D8;"> <!ENTITY Ugrave "&#x00D9;"> <!ENTITY Uacute "&#x00DA;"> <!ENTITY Ucirc "&#x00DB;"> <!ENTITY Uuml "&#x00DC;"> <!ENTITY Yacute "&#x00DD;"> <!ENTITY THORN "&#x00DE;"> <!ENTITY szlig "&#x00DF;"> <!ENTITY agrave "&#x00E0;"> <!ENTITY aacute "&#x00E1;"> <!ENTITY acirc "&#x00E2;"> <!ENTITY atilde "&#x00E3;"> <!ENTITY auml "&#x00E4;"> <!ENTITY aring "&#x00E5;"> <!ENTITY aelig "&#x00E6;"> <!ENTITY ccedil "&#x00E7;"> <!ENTITY egrave "&#x00E8;"> <!ENTITY eacute "&#x00E9;"> <!ENTITY ecirc "&#x00EA;"> <!ENTITY euml "&#x00EB;"> <!ENTITY igrave "&#x00EC;"> <!ENTITY iacute "&#x00ED;"> <!ENTITY icirc "&#x00EE;"> <!ENTITY iuml "&#x00EF;"> <!ENTITY eth "&#x00F0;"> <!ENTITY ntilde "&#x00F1;"> <!ENTITY ograve "&#x00F2;"> <!ENTITY oacute "&#x00F3;"> <!ENTITY ocirc "&#x00F4;"> <!ENTITY otilde "&#x00F5;"> <!ENTITY ouml "&#x00F6;"> <!ENTITY divide "&#x00F7;"> <!ENTITY oslash "&#x00F8;"> <!ENTITY ugrave "&#x00F9;"> <!ENTITY uacute "&#x00FA;"> <!ENTITY ucirc "&#x00FB;"> <!ENTITY uuml "&#x00FC;"> <!ENTITY yacute "&#x00FD;"> <!ENTITY thorn "&#x00FE;"> <!ENTITY yuml "&#x00FF;"> <!ENTITY OElig "&#x0152;"> <!ENTITY oelig "&#x0153;"> <!ENTITY Scaron "&#x0160;"> <!ENTITY scaron "&#x0161;"> <!ENTITY Yuml "&#x0178;"> <!ENTITY fnof "&#x0192;"> <!ENTITY circ "&#x02C6;"> <!ENTITY tilde "&#x02DC;"> <!ENTITY Alpha "&#x0391;"> <!ENTITY Beta "&#x0392;"> <!ENTITY Gamma "&#x0393;"> <!ENTITY Epsilon "&#x0395;"> <!ENTITY Zeta "&#x0396;"> <!ENTITY Eta "&#x0397;"> <!ENTITY Theta "&#x0398;"> <!ENTITY Iota "&#x0399;"> <!ENTITY Kappa "&#x039A;"> <!ENTITY Lambda "&#x039B;"> <!ENTITY Mu "&#x039C;"> <!ENTITY Nu "&#x039D;"> <!ENTITY Xi "&#x039E;"> <!ENTITY Omicron "&#x039F;"> <!ENTITY Pi "&#x03A0;"> <!ENTITY Rho "&#x03A1;"> <!ENTITY Sigma "&#x03A3;"> <!ENTITY Tau "&#x03A4;"> <!ENTITY Upsilon "&#x03A5;"> <!ENTITY Phi "&#x03A6;"> <!ENTITY Chi "&#x03A7;"> <!ENTITY Psi "&#x03A8;"> <!ENTITY Omega "&#x03A9;"> <!ENTITY alpha "&#x03B1;"> <!ENTITY beta "&#x03B2;"> <!ENTITY gamma "&#x03B3;"> <!ENTITY delta "&#x03B4;"> <!ENTITY epsilon "&#x03B5;"> <!ENTITY zeta "&#x03B6;"> <!ENTITY eta "&#x03B7;"> <!ENTITY theta "&#x03B8;"> <!ENTITY iota "&#x03B9;"> <!ENTITY kappa "&#x03BA;"> <!ENTITY lambda "&#x03BB;"> <!ENTITY mu "&#x03BC;"> <!ENTITY nu "&#x03BD;"> <!ENTITY xi "&#x03BE;"> <!ENTITY omicron "&#x03BF;"> <!ENTITY pi "&#x03C0;"> <!ENTITY rho "&#x03C1;"> <!ENTITY sigmaf "&#x03C2;"> <!ENTITY sigma "&#x03C3;"> <!ENTITY tau "&#x03C4;"> <!ENTITY upsilon "&#x03C5;"> <!ENTITY phi "&#x03C6;"> <!ENTITY chi "&#x03C7;"> <!ENTITY psi "&#x03C8;"> <!ENTITY omega "&#x03C9;"> <!ENTITY thetasym "&#x03D1;"> <!ENTITY upsih "&#x03D2;"> <!ENTITY piv "&#x03D6;"> <!ENTITY ensp "&#x2002;"> <!ENTITY emsp "&#x2003;"> <!ENTITY thinsp "&#x2009;"> <!ENTITY zwnj "&#x200C;"> <!ENTITY zwj "&#x200D;"> <!ENTITY lrm "&#x200E;"> <!ENTITY rlm "&#x200F;"> <!ENTITY ndash "&#x2013;"> <!ENTITY mdash "&#x2014;"> <!ENTITY lsquo "&#x2018;"> <!ENTITY rsquo "&#x2019;"> <!ENTITY sbquo "&#x201A;"> <!ENTITY ldquo "&#x201C;"> <!ENTITY rdquo "&#x201D;"> <!ENTITY bdquo "&#x201E;"> <!ENTITY dagger "&#x2020;"> <!ENTITY Dagger "&#x2021;"> <!ENTITY bull "&#x2022;"> <!ENTITY hellip "&#x2026;"> <!ENTITY permil "&#x2030;"> <!ENTITY prime "&#x2032;"> <!ENTITY Prime "&#x2033;"> <!ENTITY lsaquo "&#x2039;"> <!ENTITY rsaquo "&#x203A;"> <!ENTITY oline "&#x203E;"> <!ENTITY frasl "&#x2044;"> <!ENTITY euro "&#x20AC;"> <!ENTITY image "&#x2111;"> <!ENTITY weierp "&#x2118;"> <!ENTITY real "&#x211C;"> <!ENTITY trade "&#x2122;"> <!ENTITY alefsym "&#x2135;"> <!ENTITY larr "&#x2190;"> <!ENTITY uarr "&#x2191;"> <!ENTITY rarr "&#x2192;"> <!ENTITY darr "&#x2193;"> <!ENTITY harr "&#x2194;"> <!ENTITY crarr "&#x21B5;"> <!ENTITY lArr "&#x21D0;"> <!ENTITY uArr "&#x21D1;"> <!ENTITY rArr "&#x21D2;"> <!ENTITY dArr "&#x21D3;"> <!ENTITY hArr "&#x21D4;"> <!ENTITY forall "&#x2200;"> <!ENTITY part "&#x2202;"> <!ENTITY exist "&#x2203;"> <!ENTITY empty "&#x2205;"> <!ENTITY nabla "&#x2207;"> <!ENTITY isin "&#x2208;"> <!ENTITY notin "&#x2209;"> <!ENTITY ni "&#x220B;"> <!ENTITY prod "&#x220F;"> <!ENTITY sum "&#x2211;"> <!ENTITY minus "&#x2212;"> <!ENTITY lowast "&#x2217;"> <!ENTITY radic "&#x221A;"> <!ENTITY prop "&#x221D;"> <!ENTITY infin "&#x221E;"> <!ENTITY ang "&#x2220;"> <!ENTITY and "&#x2227;"> <!ENTITY or "&#x2228;"> <!ENTITY cap "&#x2229;"> <!ENTITY cup "&#x222A;"> <!ENTITY int "&#x222B;"> <!ENTITY there4 "&#x2234;"> <!ENTITY sim "&#x223C;"> <!ENTITY cong "&#x2245;"> <!ENTITY asymp "&#x2248;"> <!ENTITY ne "&#x2260;"> <!ENTITY equiv "&#x2261;"> <!ENTITY le "&#x2264;"> <!ENTITY ge "&#x2265;"> <!ENTITY sub "&#x2282;"> <!ENTITY sup "&#x2283;"> <!ENTITY nsub "&#x2284;"> <!ENTITY sube "&#x2286;"> <!ENTITY supe "&#x2287;"> <!ENTITY oplus "&#x2295;"> <!ENTITY otimes "&#x2297;"> <!ENTITY perp "&#x22A5;"> <!ENTITY sdot "&#x22C5;"> <!ENTITY lceil "&#x2308;"> <!ENTITY rceil "&#x2309;"> <!ENTITY lfloor "&#x230A;"> <!ENTITY rfloor "&#x230B;"> <!ENTITY lang "&#x2329;"> <!ENTITY rang "&#x232A;"> <!ENTITY loz "&#x25CA;"> <!ENTITY spades "&#x2660;"> <!ENTITY clubs "&#x2663;"> <!ENTITY hearts "&#x2665;"> <!ENTITY diams "&#x2666;"> ]>';
 678      }
 679  }


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