inc/3rdparty/libraries/content-extractor/ContentExtractor.php

   1 <?php
   2 /**
   3  * Content Extractor
   4  *
   5  * Uses patterns specified in site config files and auto detection (hNews/PHP Readability)
   6  * to extract content from HTML files.
   7  *
   8  * @version 1.0
   9  * @date 2013-02-05
  10  * @author Keyvan Minoukadeh
  11  * @copyright 2013 Keyvan Minoukadeh
  12  * @license http://www.gnu.org/licenses/agpl-3.0.html AGPL v3
  13  */
  14
  15 class ContentExtractor
  16 {
  17         protected static $tidy_config = array(
  18                                  'clean' => true,
  19                                  'output-xhtml' => true,
  20                                  'logical-emphasis' => true,
  21                                  'show-body-only' => false,
  22                                  'new-blocklevel-tags' => 'article, aside, footer, header, hgroup, menu, nav, section, details, datagrid',
  23                                  'new-inline-tags' => 'mark, time, meter, progress, data',
  24                                  'wrap' => 0,
  25                                  'drop-empty-paras' => true,
  26                                  'drop-proprietary-attributes' => false,
  27                                  'enclose-text' => true,
  28                                  'enclose-block-text' => true,
  29                                  'merge-divs' => true,
  30                                  'merge-spans' => true,
  31                                  'char-encoding' => 'utf8',
  32                                  'hide-comments' => true
  33                                  );
  34         protected $html;
  35         protected $config;
  36         protected $title;
  37         protected $author = array();
  38         protected $language;
  39         protected $date;
  40         protected $body;
  41         protected $success = false;
  42         protected $nextPageUrl;
  43         public $allowedParsers = array('libxml', 'html5lib');
  44         public $fingerprints = array();
  45         public $readability;
  46         public $debug = false;
  47         public $debugVerbose = false;
  48
  49         function __construct($path, $fallback=null) {
  50                 SiteConfig::set_config_path($path, $fallback);
  51         }
  52
  53         protected function debug($msg) {
  54                 if ($this->debug) {
  55                         $mem = round(memory_get_usage()/1024, 2);
  56                         $memPeak = round(memory_get_peak_usage()/1024, 2);
  57                         echo '* ',$msg;
  58                         if ($this->debugVerbose) echo ' - mem used: ',$mem," (peak: $memPeak)";
  59                         echo "\n";
  60                         ob_flush();
  61                         flush();
  62                 }
  63         }
  64
  65         public function reset() {
  66                 $this->html = null;
  67                 $this->readability = null;
  68                 $this->config = null;
  69                 $this->title = null;
  70                 $this->body = null;
  71                 $this->author = array();
  72                 $this->language = null;
  73                 $this->date = null;
  74                 $this->nextPageUrl = null;
  75                 $this->success = false;
  76         }
  77
  78         public function findHostUsingFingerprints($html) {
  79                 $this->debug('Checking fingerprints...');
  80                 $head = substr($html, 0, 8000);
  81                 foreach ($this->fingerprints as $_fp => $_fphost) {
  82                         $lookin = 'html';
  83                         if (is_array($_fphost)) {
  84                                 if (isset($_fphost['head']) && $_fphost['head']) {
  85                                         $lookin = 'head';
  86                                 }
  87                                 $_fphost = $_fphost['hostname'];
  88                         }
  89                         if (strpos($$lookin, $_fp) !== false) {
  90                                 $this->debug("Found match: $_fphost");
  91                                 return $_fphost;
  92                         }
  93                 }
  94                 $this->debug('No fingerprint matches');
  95                 return false;
  96         }
  97
  98         // returns SiteConfig instance (joined in order: exact match, wildcard, fingerprint, global, default)
  99         public function buildSiteConfig($url, $html='', $add_to_cache=true) {
 100                 // extract host name
 101                 $host = @parse_url($url, PHP_URL_HOST);
 102                 $host = strtolower($host);
 103                 if (substr($host, 0, 4) == 'www.') $host = substr($host, 4);
 104                 // is merged version already cached?
 105                 if (SiteConfig::is_cached("$host.merged")) {
 106                         $this->debug("Returning cached and merged site config for $host");
 107                         return SiteConfig::build("$host.merged");
 108                 }
 109                 // let's build from site_config/custom/ and standard/
 110                 $config = SiteConfig::build($host);
 111                 if ($add_to_cache && $config && !SiteConfig::is_cached("$host")) {
 112                         SiteConfig::add_to_cache($host, $config);
 113                 }
 114                 // if no match, use defaults
 115                 if (!$config) $config = new SiteConfig();
 116                 // load fingerprint config?
 117                 if ($config->autodetect_on_failure()) {
 118                         // check HTML for fingerprints
 119                         if (!empty($this->fingerprints) && ($_fphost = $this->findHostUsingFingerprints($html))) {
 120                                 if ($config_fingerprint = SiteConfig::build($_fphost)) {
 121                                         $this->debug("Appending site config settings from $_fphost (fingerprint match)");
 122                                         $config->append($config_fingerprint);
 123                                         if ($add_to_cache && !SiteConfig::is_cached($_fphost)) {
 124                                                 //$config_fingerprint->cache_in_apc = true;
 125                                                 SiteConfig::add_to_cache($_fphost, $config_fingerprint);
 126                                         }
 127                                 }
 128                         }
 129                 }
 130                 // load global config?
 131                 if ($config->autodetect_on_failure()) {
 132                         if ($config_global = SiteConfig::build('global', true)) {
 133                                 $this->debug('Appending site config settings from global.txt');
 134                                 $config->append($config_global);
 135                                 if ($add_to_cache && !SiteConfig::is_cached('global')) {
 136                                         //$config_global->cache_in_apc = true;
 137                                         SiteConfig::add_to_cache('global', $config_global);
 138                                 }
 139                         }
 140                 }
 141                 // store copy of merged config
 142                 if ($add_to_cache) {
 143                         // do not store in APC if wildcard match
 144                         $use_apc = ($host == $config->cache_key);
 145                         $config->cache_key = null;
 146                         SiteConfig::add_to_cache("$host.merged", $config, $use_apc);
 147                 }
 148                 return $config;
 149         }
 150
 151         // returns true on success, false on failure
 152         // $smart_tidy indicates that if tidy is used and no results are produced, we will
 153         // try again without it. Tidy helps us deal with PHP's patchy HTML parsing most of the time
 154         // but it has problems of its own which we try to avoid with this option.
 155         public function process($html, $url, $smart_tidy=true) {
 156                 $this->reset();
 157                 $this->config = $this->buildSiteConfig($url, $html);
 158
 159                 // do string replacements
 160                 if (!empty($this->config->find_string)) {
 161                         if (count($this->config->find_string) == count($this->config->replace_string)) {
 162                                 $html = str_replace($this->config->find_string, $this->config->replace_string, $html, $_count);
 163                                 $this->debug("Strings replaced: $_count (find_string and/or replace_string)");
 164                         } else {
 165                                 $this->debug('Skipped string replacement - incorrect number of find-replace strings in site config');
 166                         }
 167                         unset($_count);
 168                 }
 169
 170                 // use tidy (if it exists)?
 171                 // This fixes problems with some sites which would otherwise
 172                 // trouble DOMDocument's HTML parsing. (Although sometimes it
 173                 // makes matters worse, which is why you can override it in site config files.)
 174                 $tidied = false;
 175                 if ($this->config->tidy() && function_exists('tidy_parse_string') && $smart_tidy) {
 176                         $this->debug('Using Tidy');
 177                         $tidy = tidy_parse_string($html, self::$tidy_config, 'UTF8');
 178                         if (tidy_clean_repair($tidy)) {
 179                                 $original_html = $html;
 180                                 $tidied = true;
 181                                 $html = $tidy->value;
 182                         }
 183                         unset($tidy);
 184                 }
 185
 186                 // load and parse html
 187                 $_parser = $this->config->parser();
 188                 if (!in_array($_parser, $this->allowedParsers)) {
 189                         $this->debug("HTML parser $_parser not listed, using libxml instead");
 190                         $_parser = 'libxml';
 191                 }
 192                 $this->debug("Attempting to parse HTML with $_parser");
 193                 $this->readability = new Readability($html, $url, $_parser);
 194
 195                 // we use xpath to find elements in the given HTML document
 196                 // see http://en.wikipedia.org/wiki/XPath_1.0
 197                 $xpath = new DOMXPath($this->readability->dom);
 198
 199                 // try to get next page link
 200                 foreach ($this->config->next_page_link as $pattern) {
 201                         $elems = @$xpath->evaluate($pattern, $this->readability->dom);
 202                         if (is_string($elems)) {
 203                                 $this->nextPageUrl = trim($elems);
 204                                 break;
 205                         } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
 206                                 foreach ($elems as $item) {
 207                                         if ($item instanceof DOMElement && $item->hasAttribute('href')) {
 208                                                 $this->nextPageUrl = $item->getAttribute('href');
 209                                                 break 2;
 210                                         } elseif ($item instanceof DOMAttr && $item->value) {
 211                                                 $this->nextPageUrl = $item->value;
 212                                                 break 2;
 213                                         }
 214                                 }
 215                         }
 216                 }
 217
 218                 // try to get title
 219                 foreach ($this->config->title as $pattern) {
 220                         // $this->debug("Trying $pattern");
 221                         $elems = @$xpath->evaluate($pattern, $this->readability->dom);
 222                         if (is_string($elems)) {
 223                                 $this->title = trim($elems);
 224                                 $this->debug('Title expression evaluated as string: '.$this->title);
 225                                 $this->debug("...XPath match: $pattern");
 226                                 break;
 227                         } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
 228                                 $this->title = $elems->item(0)->textContent;
 229                                 $this->debug('Title matched: '.$this->title);
 230                                 $this->debug("...XPath match: $pattern");
 231                                 // remove title from document
 232                                 try {
 233                                         @$elems->item(0)->parentNode->removeChild($elems->item(0));
 234                                 } catch (DOMException $e) {
 235                                         // do nothing
 236                                 }
 237                                 break;
 238                         }
 239                 }
 240
 241                 // try to get author (if it hasn't already been set)
 242                 if (empty($this->author)) {
 243                         foreach ($this->config->author as $pattern) {
 244                                 $elems = @$xpath->evaluate($pattern, $this->readability->dom);
 245                                 if (is_string($elems)) {
 246                                         if (trim($elems) != '') {
 247                                                 $this->author[] = trim($elems);
 248                                                 $this->debug('Author expression evaluated as string: '.trim($elems));
 249                                                 $this->debug("...XPath match: $pattern");
 250                                                 break;
 251                                         }
 252                                 } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
 253                                         foreach ($elems as $elem) {
 254                                                 if (!isset($elem->parentNode)) continue;
 255                                                 $this->author[] = trim($elem->textContent);
 256                                                 $this->debug('Author matched: '.trim($elem->textContent));
 257                                         }
 258                                         if (!empty($this->author)) {
 259                                                 $this->debug("...XPath match: $pattern");
 260                                                 break;
 261                                         }
 262                                 }
 263                         }
 264                 }
 265
 266                 // try to get language
 267                 $_lang_xpath = array('//html[@lang]/@lang', '//meta[@name="DC.language"]/@content');
 268                 foreach ($_lang_xpath as $pattern) {
 269                         $elems = @$xpath->evaluate($pattern, $this->readability->dom);
 270                         if (is_string($elems)) {
 271                                 if (trim($elems) != '') {
 272                                         $this->language = trim($elems);
 273                                         $this->debug('Language matched: '.$this->language);
 274                                         break;
 275                                 }
 276                         } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
 277                                 foreach ($elems as $elem) {
 278                                         if (!isset($elem->parentNode)) continue;
 279                                         $this->language = trim($elem->textContent);
 280                                         $this->debug('Language matched: '.$this->language);
 281                                 }
 282                                 if ($this->language) break;
 283                         }
 284                 }
 285
 286                 // try to get date
 287                 foreach ($this->config->date as $pattern) {
 288                         $elems = @$xpath->evaluate($pattern, $this->readability->dom);
 289                         if (is_string($elems)) {
 290                                 $this->date = strtotime(trim($elems, "; \t\n\r\0\x0B"));
 291                         } elseif ($elems instanceof DOMNodeList && $elems->length > 0) {
 292                                 $this->date = $elems->item(0)->textContent;
 293                                 $this->date = strtotime(trim($this->date, "; \t\n\r\0\x0B"));
 294                                 // remove date from document
 295                                 // $elems->item(0)->parentNode->removeChild($elems->item(0));
 296                         }
 297                         if (!$this->date) {
 298                                 $this->date = null;
 299                         } else {
 300                                 $this->debug('Date matched: '.date('Y-m-d H:i:s', $this->date));
 301                                 $this->debug("...XPath match: $pattern");
 302                                 break;
 303                         }
 304                 }
 305
 306                 // strip elements (using xpath expressions)
 307                 foreach ($this->config->strip as $pattern) {
 308                         $elems = @$xpath->query($pattern, $this->readability->dom);
 309                         // check for matches
 310                         if ($elems && $elems->length > 0) {
 311                                 $this->debug('Stripping '.$elems->length.' elements (strip)');
 312                                 for ($i=$elems->length-1; $i >= 0; $i--) {
 313                                         $elems->item($i)->parentNode->removeChild($elems->item($i));
 314                                 }
 315                         }
 316                 }
 317
 318                 // strip elements (using id and class attribute values)
 319                 foreach ($this->config->strip_id_or_class as $string) {
 320                         $string = strtr($string, array("'"=>'', '"'=>''));
 321                         $elems = @$xpath->query("//*[contains(@class, '$string') or contains(@id, '$string')]", $this->readability->dom);
 322                         // check for matches
 323                         if ($elems && $elems->length > 0) {
 324                                 $this->debug('Stripping '.$elems->length.' elements (strip_id_or_class)');
 325                                 for ($i=$elems->length-1; $i >= 0; $i--) {
 326                                         $elems->item($i)->parentNode->removeChild($elems->item($i));
 327                                 }
 328                         }
 329                 }
 330
 331                 // strip images (using src attribute values)
 332                 foreach ($this->config->strip_image_src as $string) {
 333                         $string = strtr($string, array("'"=>'', '"'=>''));
 334                         $elems = @$xpath->query("//img[contains(@src, '$string')]", $this->readability->dom);
 335                         // check for matches
 336                         if ($elems && $elems->length > 0) {
 337                                 $this->debug('Stripping '.$elems->length.' image elements');
 338                                 for ($i=$elems->length-1; $i >= 0; $i--) {
 339                                         $elems->item($i)->parentNode->removeChild($elems->item($i));
 340                                 }
 341                         }
 342                 }
 343                 // strip elements using Readability.com and Instapaper.com ignore class names
 344                 // .entry-unrelated and .instapaper_ignore
 345                 // See https://www.readability.com/publishers/guidelines/#view-plainGuidelines
 346                 // and http://blog.instapaper.com/post/730281947
 347                 $elems = @$xpath->query("//*[contains(concat(' ',normalize-space(@class),' '),' entry-unrelated ') or contains(concat(' ',normalize-space(@class),' '),' instapaper_ignore ')]", $this->readability->dom);
 348                 // check for matches
 349                 if ($elems && $elems->length > 0) {
 350                         $this->debug('Stripping '.$elems->length.' .entry-unrelated,.instapaper_ignore elements');
 351                         for ($i=$elems->length-1; $i >= 0; $i--) {
 352                                 $elems->item($i)->parentNode->removeChild($elems->item($i));
 353                         }
 354                 }
 355
 356                 // strip elements that contain style="display: none;"
 357                 $elems = @$xpath->query("//*[contains(@style,'display:none')]", $this->readability->dom);
 358                 // check for matches
 359                 if ($elems && $elems->length > 0) {
 360                         $this->debug('Stripping '.$elems->length.' elements with inline display:none style');
 361                         for ($i=$elems->length-1; $i >= 0; $i--) {
 362                                 $elems->item($i)->parentNode->removeChild($elems->item($i));
 363                         }
 364                 }
 365
 366                 // try to get body
 367                 foreach ($this->config->body as $pattern) {
 368                         $elems = @$xpath->query($pattern, $this->readability->dom);
 369                         // check for matches
 370                         if ($elems && $elems->length > 0) {
 371                                 $this->debug('Body matched');
 372                                 $this->debug("...XPath match: $pattern");
 373                                 if ($elems->length == 1) {
 374                                         $this->body = $elems->item(0);
 375                                         // prune (clean up elements that may not be content)
 376                                         if ($this->config->prune()) {
 377                                                 $this->debug('...pruning content');
 378                                                 $this->readability->prepArticle($this->body);
 379                                         }
 380                                         break;
 381                                 } else {
 382                                         $this->body = $this->readability->dom->createElement('div');
 383                                         $this->debug($elems->length.' body elems found');
 384                                         foreach ($elems as $elem) {
 385                                                 if (!isset($elem->parentNode)) continue;
 386                                                 $isDescendant = false;
 387                                                 foreach ($this->body->childNodes as $parent) {
 388                                                         if ($this->isDescendant($parent, $elem)) {
 389                                                                 $isDescendant = true;
 390                                                                 break;
 391                                                         }
 392                                                 }
 393                                                 if ($isDescendant) {
 394                                                         $this->debug('...element is child of another body element, skipping.');
 395                                                 } else {
 396                                                         // prune (clean up elements that may not be content)
 397                                                         if ($this->config->prune()) {
 398                                                                 $this->debug('Pruning content');
 399                                                                 $this->readability->prepArticle($elem);
 400                                                         }
 401                                                         $this->debug('...element added to body');
 402                                                         $this->body->appendChild($elem);
 403                                                 }
 404                                         }
 405                                         if ($this->body->hasChildNodes()) break;
 406                                 }
 407                         }
 408                 }
 409
 410                 // auto detect?
 411                 $detect_title = $detect_body = $detect_author = $detect_date = false;
 412                 // detect title?
 413                 if (!isset($this->title)) {
 414                         if (empty($this->config->title) || $this->config->autodetect_on_failure()) {
 415                                 $detect_title = true;
 416                         }
 417                 }
 418                 // detect body?
 419                 if (!isset($this->body)) {
 420                         if (empty($this->config->body) || $this->config->autodetect_on_failure()) {
 421                                 $detect_body = true;
 422                         }
 423                 }
 424                 // detect author?
 425                 if (empty($this->author)) {
 426                         if (empty($this->config->author) || $this->config->autodetect_on_failure()) {
 427                                 $detect_author = true;
 428                         }
 429                 }
 430                 // detect date?
 431                 if (!isset($this->date)) {
 432                         if (empty($this->config->date) || $this->config->autodetect_on_failure()) {
 433                                 $detect_date = true;
 434                         }
 435                 }
 436
 437                 // check for hNews
 438                 if ($detect_title || $detect_body) {
 439                         // check for hentry
 440                         $elems = @$xpath->query("//*[contains(concat(' ',normalize-space(@class),' '),' hentry ')]", $this->readability->dom);
 441                         if ($elems && $elems->length > 0) {
 442                                 $this->debug('hNews: found hentry');
 443                                 $hentry = $elems->item(0);
 444
 445                                 if ($detect_title) {
 446                                         // check for entry-title
 447                                         $elems = @$xpath->query(".//*[contains(concat(' ',normalize-space(@class),' '),' entry-title ')]", $hentry);
 448                                         if ($elems && $elems->length > 0) {
 449                                                 $this->title = $elems->item(0)->textContent;
 450                                                 $this->debug('hNews: found entry-title: '.$this->title);
 451                                                 // remove title from document
 452                                                 $elems->item(0)->parentNode->removeChild($elems->item(0));
 453                                                 $detect_title = false;
 454                                         }
 455                                 }
 456
 457                                 if ($detect_date) {
 458                                         // check for time element with pubdate attribute
 459                                         $elems = @$xpath->query(".//time[@pubdate] | .//abbr[contains(concat(' ',normalize-space(@class),' '),' published ')]", $hentry);
 460                                         if ($elems && $elems->length > 0) {
 461                                                 $this->date = strtotime(trim($elems->item(0)->textContent));
 462                                                 // remove date from document
 463                                                 //$elems->item(0)->parentNode->removeChild($elems->item(0));
 464                                                 if ($this->date) {
 465                                                         $this->debug('hNews: found publication date: '.date('Y-m-d H:i:s', $this->date));
 466                                                         $detect_date = false;
 467                                                 } else {
 468                                                         $this->date = null;
 469                                                 }
 470                                         }
 471                                 }
 472
 473                                 if ($detect_author) {
 474                                         // check for time element with pubdate attribute
 475                                         $elems = @$xpath->query(".//*[contains(concat(' ',normalize-space(@class),' '),' vcard ') and (contains(concat(' ',normalize-space(@class),' '),' author ') or contains(concat(' ',normalize-space(@class),' '),' byline '))]", $hentry);
 476                                         if ($elems && $elems->length > 0) {
 477                                                 $author = $elems->item(0);
 478                                                 $fn = @$xpath->query(".//*[contains(concat(' ',normalize-space(@class),' '),' fn ')]", $author);
 479                                                 if ($fn && $fn->length > 0) {
 480                                                         foreach ($fn as $_fn) {
 481                                                                 if (trim($_fn->textContent) != '') {
 482                                                                         $this->author[] = trim($_fn->textContent);
 483                                                                         $this->debug('hNews: found author: '.trim($_fn->textContent));
 484                                                                 }
 485                                                         }
 486                                                 } else {
 487                                                         if (trim($author->textContent) != '') {
 488                                                                 $this->author[] = trim($author->textContent);
 489                                                                 $this->debug('hNews: found author: '.trim($author->textContent));
 490                                                         }
 491                                                 }
 492                                                 $detect_author = empty($this->author);
 493                                         }
 494                                 }
 495
 496                                 // check for entry-content.
 497                                 // according to hAtom spec, if there are multiple elements marked entry-content,
 498                                 // we include all of these in the order they appear - see http://microformats.org/wiki/hatom#Entry_Content
 499                                 if ($detect_body) {
 500                                         $elems = @$xpath->query(".//*[contains(concat(' ',normalize-space(@class),' '),' entry-content ')]", $hentry);
 501                                         if ($elems && $elems->length > 0) {
 502                                                 $this->debug('hNews: found entry-content');
 503                                                 if ($elems->length == 1) {
 504                                                         // what if it's empty? (some sites misuse hNews - place their content outside an empty entry-content element)
 505                                                         $e = $elems->item(0);
 506                                                         if (($e->tagName == 'img') || (trim($e->textContent) != '')) {
 507                                                                 $this->body = $elems->item(0);
 508                                                                 // prune (clean up elements that may not be content)
 509                                                                 if ($this->config->prune()) {
 510                                                                         $this->debug('Pruning content');
 511                                                                         $this->readability->prepArticle($this->body);
 512                                                                 }
 513                                                                 $detect_body = false;
 514                                                         } else {
 515                                                                 $this->debug('hNews: skipping entry-content - appears not to contain content');
 516                                                         }
 517                                                         unset($e);
 518                                                 } else {
 519                                                         $this->body = $this->readability->dom->createElement('div');
 520                                                         $this->debug($elems->length.' entry-content elems found');
 521                                                         foreach ($elems as $elem) {
 522                                                                 if (!isset($elem->parentNode)) continue;
 523                                                                 $isDescendant = false;
 524                                                                 foreach ($this->body->childNodes as $parent) {
 525                                                                         if ($this->isDescendant($parent, $elem)) {
 526                                                                                 $isDescendant = true;
 527                                                                                 break;
 528                                                                         }
 529                                                                 }
 530                                                                 if ($isDescendant) {
 531                                                                         $this->debug('Element is child of another body element, skipping.');
 532                                                                 } else {
 533                                                                         // prune (clean up elements that may not be content)
 534                                                                         if ($this->config->prune()) {
 535                                                                                 $this->debug('Pruning content');
 536                                                                                 $this->readability->prepArticle($elem);
 537                                                                         }
 538                                                                         $this->debug('Element added to body');
 539                                                                         $this->body->appendChild($elem);
 540                                                                 }
 541                                                         }
 542                                                         $detect_body = false;
 543                                                 }
 544                                         }
 545                                 }
 546                         }
 547                 }
 548
 549                 // check for elements marked with instapaper_title
 550                 if ($detect_title) {
 551                         // check for instapaper_title
 552                         $elems = @$xpath->query("//*[contains(concat(' ',normalize-space(@class),' '),' instapaper_title ')]", $this->readability->dom);
 553                         if ($elems && $elems->length > 0) {
 554                                 $this->title = $elems->item(0)->textContent;
 555                                 $this->debug('Title found (.instapaper_title): '.$this->title);
 556                                 // remove title from document
 557                                 $elems->item(0)->parentNode->removeChild($elems->item(0));
 558                                 $detect_title = false;
 559                         }
 560                 }
 561                 // check for elements marked with instapaper_body
 562                 if ($detect_body) {
 563                         $elems = @$xpath->query("//*[contains(concat(' ',normalize-space(@class),' '),' instapaper_body ')]", $this->readability->dom);
 564                         if ($elems && $elems->length > 0) {
 565                                 $this->debug('body found (.instapaper_body)');
 566                                 $this->body = $elems->item(0);
 567                                 // prune (clean up elements that may not be content)
 568                                 if ($this->config->prune()) {
 569                                         $this->debug('Pruning content');
 570                                         $this->readability->prepArticle($this->body);
 571                                 }
 572                                 $detect_body = false;
 573                         }
 574                 }
 575
 576                 // Find author in rel="author" marked element
 577                 // We only use this if there's exactly one.
 578                 // If there's more than one, it could indicate more than
 579                 // one author, but it could also indicate that we're processing
 580                 // a page listing different articles with different authors.
 581                 if ($detect_author) {
 582                         $elems = @$xpath->query("//a[contains(concat(' ',normalize-space(@rel),' '),' author ')]", $this->readability->dom);
 583                         if ($elems && $elems->length == 1) {
 584                                 $author = trim($elems->item(0)->textContent);
 585                                 if ($author != '') {
 586                                         $this->debug("Author found (rel=\"author\"): $author");
 587                                         $this->author[] = $author;
 588                                         $detect_author = false;
 589                                 }
 590                         }
 591                 }
 592
 593                 // Find date in pubdate marked time element
 594                 // For the same reason given above, we only use this
 595                 // if there's exactly one element.
 596                 if ($detect_date) {
 597                         $elems = @$xpath->query("//time[@pubdate]", $this->readability->dom);
 598                         if ($elems && $elems->length == 1) {
 599                                 $this->date = strtotime(trim($elems->item(0)->textContent));
 600                                 // remove date from document
 601                                 //$elems->item(0)->parentNode->removeChild($elems->item(0));
 602                                 if ($this->date) {
 603                                         $this->debug('Date found (pubdate marked time element): '.date('Y-m-d H:i:s', $this->date));
 604                                         $detect_date = false;
 605                                 } else {
 606                                         $this->date = null;
 607                                 }
 608                         }
 609                 }
 610
 611                 // still missing title or body, so we detect using Readability
 612                 if ($detect_title || $detect_body) {
 613                         $this->debug('Using Readability');
 614                         // clone body if we're only using Readability for title (otherwise it may interfere with body element)
 615                         if (isset($this->body)) $this->body = $this->body->cloneNode(true);
 616                         $success = $this->readability->init();
 617                 }
 618                 if ($detect_title) {
 619                         $this->debug('Detecting title');
 620                         $this->title = $this->readability->getTitle()->textContent;
 621                 }
 622                 if ($detect_body && $success) {
 623                         $this->debug('Detecting body');
 624                         $this->body = $this->readability->getContent();
 625                         if ($this->body->childNodes->length == 1 && $this->body->firstChild->nodeType === XML_ELEMENT_NODE) {
 626                                 $this->body = $this->body->firstChild;
 627                         }
 628                         // prune (clean up elements that may not be content)
 629                         if ($this->config->prune()) {
 630                                 $this->debug('Pruning content');
 631                                 $this->readability->prepArticle($this->body);
 632                         }
 633                 }
 634                 if (isset($this->body)) {
 635                         // remove scripts
 636                         $this->readability->removeScripts($this->body);
 637                         // remove any h1-h6 elements that appear as first thing in the body
 638                         // and which match our title
 639                         if (isset($this->title) && ($this->title != '')) {
 640                                 $firstChild = $this->body->firstChild;
 641                                 while ($firstChild->nodeType && ($firstChild->nodeType !== XML_ELEMENT_NODE)) {
 642                                         $firstChild = $firstChild->nextSibling;
 643                                 }
 644                                 if (($firstChild->nodeType === XML_ELEMENT_NODE)
 645                                         && in_array(strtolower($firstChild->tagName), array('h1', 'h2', 'h3', 'h4', 'h5', 'h6'))
 646                                         && (strtolower(trim($firstChild->textContent)) == strtolower(trim($this->title)))) {
 647                                                 $this->body->removeChild($firstChild);
 648                                 }
 649                         }
 650                         // prevent self-closing iframes
 651                         $elems = $this->body->getElementsByTagName('iframe');
 652                         for ($i = $elems->length-1; $i >= 0; $i--) {
 653                                 $e = $elems->item($i);
 654                                 if (!$e->hasChildNodes()) {
 655                                         $e->appendChild($this->body->ownerDocument->createTextNode('[embedded content]'));
 656                                 }
 657                         }
 658                         // remove image lazy loading - WordPress plugin http://wordpress.org/extend/plugins/lazy-load/
 659                         // the plugin replaces the src attribute to point to a 1x1 gif and puts the original src
 660                         // inside the data-lazy-src attribute. It also places the original image inside a noscript element
 661                         // next to the amended one.
 662                         $elems = @$xpath->query("//img[@data-lazy-src]", $this->body);
 663                         for ($i = $elems->length-1; $i >= 0; $i--) {
 664                                 $e = $elems->item($i);
 665                                 // let's see if we can grab image from noscript
 666                                 if ($e->nextSibling !== null && $e->nextSibling->nodeName === 'noscript') {
 667                                         $_new_elem = $e->ownerDocument->createDocumentFragment();
 668                                         @$_new_elem->appendXML($e->nextSibling->innerHTML);
 669                                         $e->nextSibling->parentNode->replaceChild($_new_elem, $e->nextSibling);
 670                                         $e->parentNode->removeChild($e);
 671                                 } else {
 672                                         // Use data-lazy-src as src value
 673                                         $e->setAttribute('src', $e->getAttribute('data-lazy-src'));
 674                                         $e->removeAttribute('data-lazy-src');
 675                                 }
 676                         }
 677
 678                         $this->success = true;
 679                 }
 680
 681                 // if we've had no success and we've used tidy, there's a chance
 682                 // that tidy has messed up. So let's try again without tidy...
 683                 if (!$this->success && $tidied && $smart_tidy) {
 684                         $this->debug('Trying again without tidy');
 685                         $this->process($original_html, $url, false);
 686                 }
 687
 688                 return $this->success;
 689         }
 690
 691         private function isDescendant(DOMElement $parent, DOMElement $child) {
 692                 $node = $child->parentNode;
 693                 while ($node != null) {
 694                         if ($node->isSameNode($parent)) return true;
 695                         $node = $node->parentNode;
 696                 }
 697                 return false;
 698         }
 699
 700         public function getContent() {
 701                 return $this->body;
 702         }
 703
 704         public function getTitle() {
 705                 return $this->title;
 706         }
 707
 708         public function getAuthors() {
 709                 return $this->author;
 710         }
 711
 712         public function getLanguage() {
 713                 return $this->language;
 714         }
 715
 716         public function getDate() {
 717                 return $this->date;
 718         }
 719
 720         public function getSiteConfig() {
 721                 return $this->config;
 722         }
 723
 724         public function getNextPageUrl() {
 725                 return $this->nextPageUrl;
 726         }
 727 }