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3ec62cf9 MR |
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 | } |