1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
|
<?php
namespace andreskrey\Readability;
use DOMDocument;
/**
* Class HTMLParser.
*
* A helper class to parse HTML and get a Readability object.
*/
class HTMLParser
{
/**
* @var DOMDocument
*/
private $dom = null;
/**
* TODO Make this an object? Instead of a dumb array.
*
* @var array
*/
private $metadata = [];
/**
* @var array
*/
private $regexps = [
'unlikelyCandidates' => '/banner|breadcrumbs|combx|comment|community|cover-wrap|disqus|extra|foot|header|legends|menu|modal|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|yom-remote/i',
'okMaybeItsACandidate' => '/and|article|body|column|main|shadow/i',
'extraneous' => '/print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single|utility/i',
'byline' => '/byline|author|dateline|writtenby|p-author/i',
'replaceFonts' => '/<(\/?)font[^>]*>/gi',
'normalize' => '/\s{2,}/',
'videos' => '/\/\/(www\.)?(dailymotion|youtube|youtube-nocookie|player\.vimeo)\.com/i',
'nextLink' => '/(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i',
'prevLink' => '/(prev|earl|old|new|<|«)/i',
'whitespace' => '/^\s*$/',
'hasContent' => '/\S$/',
// \x{00A0} is the unicode version of
'onlyWhitespace' => '/\x{00A0}|\s+/u'
];
private $defaultTagsToScore = [
'section',
'h2',
'h3',
'h4',
'h5',
'h6',
'p',
'td',
'pre',
];
/**
* @var array
*/
private $alterToDIVExceptions = [
'div',
'article',
'section',
'p',
// TODO, check if this is correct, #text elements do not exist in js
'#text',
];
/**
* @var array
*/
private $divToPElements = [
'a',
'blockquote',
'dl',
'div',
'img',
'ol',
'p',
'pre',
'table',
'ul',
'select',
];
/**
* Constructor.
*
* @param array $options Options to override the default ones
*/
public function __construct(array $options = [])
{
$defaults = [
'maxTopCandidates' => 5,
'wordThreshold' => 500,
'articleByLine' => false,
'stripUnlikelyCandidates' => true,
'cleanConditionally' => true,
'weightClasses' => true,
'removeReadabilityTags' => true,
'fixRelativeURLs' => false,
'substituteEntities' => true,
'normalizeEntities' => false,
'summonCthulhu' => false,
'originalURL' => 'http://fakehost',
];
$this->environment = Environment::createDefaultEnvironment($defaults);
$this->environment->getConfig()->merge($options);
// To avoid having a gazillion of errors on malformed HTMLs
libxml_use_internal_errors(true);
}
/**
* Parse the html. This is the main entry point of the HTMLParser.
*
* @param string $html Full html of the website, page, etc.
*
* #return ? TBD
*/
public function parse($html)
{
$this->dom = $this->loadHTML($html);
$this->metadata = $this->getMetadata();
$this->metadata['image'] = $this->getMainImage();
$this->metadata['title'] = $this->getTitle();
// Checking for minimum HTML to work with.
if (!($root = $this->dom->getElementsByTagName('body')->item(0)) || !$root->firstChild) {
return false;
}
$parseSuccessful = true;
while (true) {
$root = new Readability($root->firstChild);
$elementsToScore = $this->getNodes($root);
$result = $this->rateNodes($elementsToScore);
/*
* Now that we've gone through the full algorithm, check to see if
* we got any meaningful content. If we didn't, we may need to re-run
* grabArticle with different flags set. This gives us a higher likelihood of
* finding the content, and the sieve approach gives us a higher likelihood of
* finding the -right- content.
*/
// TODO Better way to count resulting text. Textcontent usually has alt titles and that stuff
// that doesn't really count to the quality of the result.
$length = 0;
foreach ($result->getElementsByTagName('p') as $p) {
$length += mb_strlen($p->textContent);
}
if ($result && mb_strlen(preg_replace('/\s/', '', $result->textContent)) < $this->getConfig()->getOption('wordThreshold')) {
$this->dom = $this->loadHTML($html);
$root = $this->dom->getElementsByTagName('body')->item(0);
if ($this->getConfig()->getOption('stripUnlikelyCandidates')) {
$this->getConfig()->setOption('stripUnlikelyCandidates', false);
} elseif ($this->getConfig()->getOption('weightClasses')) {
$this->getConfig()->setOption('weightClasses', false);
} elseif ($this->getConfig()->getOption('cleanConditionally')) {
$this->getConfig()->setOption('cleanConditionally', false);
} else {
$parseSuccessful = false;
break;
}
} else {
break;
}
}
if (!$parseSuccessful) {
return false;
}
$result = $this->postProcessContent($result);
// Todo, fix return, check for values, maybe create a function to create the return object
return [
'title' => isset($this->metadata['title']) ? $this->metadata['title'] : null,
'author' => isset($this->metadata['author']) ? $this->metadata['author'] : null,
'image' => isset($this->metadata['image']) ? $this->metadata['image'] : null,
'article' => $result,
'html' => $result->C14N(),
'dir' => isset($this->metadata['articleDir']) ? $this->metadata['articleDir'] : null,
];
}
/**
* Creates a DOM Document object and loads the provided HTML on it.
*
* Used for the first load of Readability and subsequent reloads (when disabling flags and rescanning the text)
* Previous versions of Readability used this method one time and cloned the DOM to keep a backup. This caused bugs
* because cloning the DOM object keeps a relation between the clone and the original one, doing changes in both
* objects and ruining the backup.
*
* @param string $html
*
* @return DOMDocument
*/
private function loadHTML($html)
{
$dom = new DOMDocument('1.0', 'utf-8');
if (!$this->getConfig()->getOption('substituteEntities')) {
// Keep the original HTML entities
$dom->substituteEntities = false;
}
if ($this->getConfig()->getOption('normalizeEntities')) {
// Replace UTF-8 characters with the HTML Entity equivalent. Useful to fix html with mixed content
$html = mb_convert_encoding($html, 'HTML-ENTITIES', 'UTF-8');
}
if ($this->getConfig()->getOption('summonCthulhu')) {
$html = preg_replace('/<script\b[^>]*>([\s\S]*?)<\/script>/', '', $html);
}
// Prepend the XML tag to avoid having issues with special characters. Should be harmless.
$dom->loadHTML('<?xml encoding="UTF-8">' . $html);
$dom->encoding = 'UTF-8';
$this->removeScripts($dom);
$this->prepDocument($dom);
return $dom;
}
/**
* @return Configuration
*/
public function getConfig()
{
return $this->environment->getConfig();
}
/**
* Removes all the scripts of the html.
*
* @param DOMDocument $dom
*/
private function removeScripts(DOMDocument $dom)
{
$toRemove = ['script', 'noscript'];
foreach ($toRemove as $tag) {
while ($script = $dom->getElementsByTagName($tag)) {
if ($script->item(0)) {
$script->item(0)->parentNode->removeChild($script->item(0));
} else {
break;
}
}
}
}
/**
* Prepares the document for parsing.
*
* @param DOMDocument $dom
*/
private function prepDocument(DOMDocument $dom)
{
/*
* DOMNodeList must be converted to an array before looping over it.
* This is done to avoid node shifting when removing nodes.
*
* Reverse traversing cannot be done here because we need to find brs that are right next to other brs.
* (If we go the other way around we need to search for previous nodes forcing the creation of new functions
* that will be used only here)
*/
foreach (iterator_to_array($dom->getElementsByTagName('br')) as $br) {
$next = $br->nextSibling;
/*
* Whether 2 or more <br> elements have been found and replaced with a
* <p> block.
*/
$replaced = false;
/*
* If we find a <br> chain, remove the <br>s until we hit another element
* or non-whitespace. This leaves behind the first <br> in the chain
* (which will be replaced with a <p> later).
*/
while (($next = $this->nextElement($next)) && ($next->nodeName === 'br')) {
$replaced = true;
$brSibling = $next->nextSibling;
$next->parentNode->removeChild($next);
$next = $brSibling;
}
/*
* If we removed a <br> chain, replace the remaining <br> with a <p>. Add
* all sibling nodes as children of the <p> until we hit another <br>
* chain.
*/
if ($replaced) {
$p = $dom->createElement('p');
$br->parentNode->replaceChild($p, $br);
$next = $p->nextSibling;
while ($next) {
// If we've hit another <br><br>, we're done adding children to this <p>.
if ($next->nodeName === 'br') {
$nextElem = $this->nextElement($next);
if ($nextElem && $nextElem->nodeName === 'br') {
break;
}
}
// Otherwise, make this node a child of the new <p>.
$sibling = $next->nextSibling;
$p->appendChild($next);
$next = $sibling;
}
}
}
// Replace font tags with span
$fonts = $dom->getElementsByTagName('font');
$length = $fonts->length;
for ($i = 0; $i < $length; $i++) {
$font = $fonts->item($length - 1 - $i);
$span = new Readability($font);
$span->setNodeTag('span', true);
}
}
public function postProcessContent(DOMDocument $article)
{
$url = $this->getConfig()->getOption('originalURL');
$pathBase = parse_url($url, PHP_URL_SCHEME) . '://' . parse_url($url, PHP_URL_HOST) . dirname(parse_url($url, PHP_URL_PATH)) . '/';
$scheme = parse_url($pathBase, PHP_URL_SCHEME);
$prePath = $scheme . '://' . parse_url($pathBase, PHP_URL_HOST);
// Readability cannot open relative uris so we convert them to absolute uris.
if ($this->getConfig()->getOption('fixRelativeURLs')) {
foreach (iterator_to_array($article->getElementsByTagName('a')) as $link) {
/** @var \DOMElement $link */
$href = $link->getAttribute('href');
if ($href) {
// Replace links with javascript: URIs with text content, since
// they won't work after scripts have been removed from the page.
if (strpos($href, 'javascript:') === 0) {
$text = $article->createTextNode($link->textContent);
$link->parentNode->replaceChild($text, $link);
} else {
$link->setAttribute('href', $this->toAbsoluteURI($href, $pathBase, $scheme, $prePath));
}
}
}
foreach ($article->getElementsByTagName('img') as $img) {
/** @var \DOMElement $img */
$src = $img->getAttribute('src');
if ($src) {
$img->setAttribute('src', $this->toAbsoluteURI($src, $pathBase, $scheme, $prePath));
}
}
}
return $article;
}
private function toAbsoluteURI($uri, $pathBase, $scheme, $prePath)
{
// If this is already an absolute URI, return it.
if (preg_match('/^[a-zA-Z][a-zA-Z0-9\+\-\.]*:/', $uri)) {
return $uri;
}
// Scheme-rooted relative URI.
if (substr($uri, 0, 2) === '//') {
return $scheme . '://' . substr($uri, 2);
}
// Prepath-rooted relative URI.
if (substr($uri, 0, 1) === '/') {
return $prePath . $uri;
}
// Dotslash relative URI.
if (strpos($uri, './') === 0) {
return $pathBase . substr($uri, 2);
}
// Ignore hash URIs:
if (substr($uri, 0, 1) === '#') {
return $uri;
}
// Standard relative URI; add entire path. pathBase already includes a
// trailing "/".
return $pathBase . $uri;
}
private function nextElement($node)
{
$next = $node;
while ($next
&& $next->nodeName !== '#text'
&& trim($next->textContent)) {
$next = $next->nextSibling;
}
return $next;
}
/**
* Tries to guess relevant info from metadata of the html.
*
* @return array Metadata info. May have title, excerpt and or byline.
*/
private function getMetadata()
{
$metadata = $values = [];
// Match "description", or Twitter's "twitter:description" (Cards)
// in name attribute.
$namePattern = '/^\s*((twitter)\s*:\s*)?(description|title|image)\s*$/i';
// Match Facebook's Open Graph title & description properties.
$propertyPattern = '/^\s*og\s*:\s*(description|title|image)\s*$/i';
foreach ($this->dom->getElementsByTagName('meta') as $meta) {
/* @var Readability $meta */
$elementName = $meta->getAttribute('name');
$elementProperty = $meta->getAttribute('property');
if (in_array('author', [$elementName, $elementProperty])) {
$metadata['byline'] = $meta->getAttribute('content');
continue;
}
$name = null;
if (preg_match($namePattern, $elementName)) {
$name = $elementName;
} elseif (preg_match($propertyPattern, $elementProperty)) {
$name = $elementProperty;
}
if ($name) {
$content = $meta->getAttribute('content');
if ($content) {
// Convert to lowercase and remove any whitespace
// so we can match below.
$name = preg_replace('/\s/', '', strtolower($name));
$values[$name] = trim($content);
}
}
}
if (array_key_exists('description', $values)) {
$metadata['excerpt'] = $values['description'];
} elseif (array_key_exists('og:description', $values)) {
// Use facebook open graph description.
$metadata['excerpt'] = $values['og:description'];
} elseif (array_key_exists('twitter:description', $values)) {
// Use twitter cards description.
$metadata['excerpt'] = $values['twitter:description'];
}
if (array_key_exists('og:title', $values)) {
// Use facebook open graph title.
$metadata['title'] = $values['og:title'];
} elseif (array_key_exists('twitter:title', $values)) {
// Use twitter cards title.
$metadata['title'] = $values['twitter:title'];
}
if (array_key_exists('og:image', $values) || array_key_exists('twitter:image', $values)) {
$metadata['image'] = array_key_exists('og:image', $values) ? $values['og:image'] : $values['twitter:image'];
} else {
$metadata['image'] = null;
}
return $metadata;
}
/**
* Tries to get the main article image. Will only update the metadata if the getMetadata function couldn't
* find a correct image.
*
* @return bool|string URL of the top image or false if unsuccessful.
*/
public function getMainImage()
{
if ($this->metadata['image'] !== null) {
return $this->metadata['image'];
}
foreach ($this->dom->getElementsByTagName('link') as $link) {
/** @var \DOMElement $link */
/*
* Check for the rel attribute, then check if the rel attribute is either img_src or image_src, and
* finally check for the existence of the href attribute, which should hold the image url.
*/
if ($link->hasAttribute('rel') && ($link->getAttribute('rel') === 'img_src' || $link->getAttribute('rel') === 'image_src') && $link->hasAttribute('href')) {
return $link->getAttribute('href');
}
}
return false;
}
/**
* Get the density of links as a percentage of the content
* This is the amount of text that is inside a link divided by the total text in the node.
*
* @param Readability $readability
*
* @return int
*/
public function getLinkDensity($readability)
{
$linkLength = 0;
$textLength = mb_strlen($readability->getTextContent(true));
if (!$textLength) {
return 0;
}
$links = $readability->getAllLinks();
if ($links) {
/** @var Readability $link */
foreach ($links as $link) {
$linkLength += mb_strlen($link->getTextContent(true));
}
}
return $linkLength / $textLength;
}
/**
* Returns the title of the html. Prioritizes the title from the metadata against the title tag.
*
* @return string|null
*/
private function getTitle()
{
$originalTitle = null;
if (isset($this->metadata['title'])) {
$originalTitle = $this->metadata['title'];
} else {
$titleTag = $this->dom->getElementsByTagName('title');
if ($titleTag->length > 0) {
$originalTitle = $titleTag->item(0)->nodeValue;
}
}
if ($originalTitle === null) {
return null;
}
$curTitle = $originalTitle;
$titleHadHierarchicalSeparators = false;
/*
* If there's a separator in the title, first remove the final part
*
* Sanity warning: if you eval this match in PHPStorm's "Evaluate expression" box, it will return false
* I can assure you it works properly if you let the code run.
*/
if (preg_match('/ [\|\-\\\\\/>»] /i', $curTitle)) {
$titleHadHierarchicalSeparators = (bool)preg_match('/ [\\\\\/>»] /', $curTitle);
$curTitle = preg_replace('/(.*)[\|\-\\\\\/>»] .*/i', '$1', $originalTitle);
// If the resulting title is too short (3 words or fewer), remove
// the first part instead:
if (count(preg_split('/\s+/', $curTitle)) < 3) {
$curTitle = preg_replace('/[^\|\-\\\\\/>»]*[\|\-\\\\\/>»](.*)/i', '$1', $originalTitle);
}
} elseif (strpos($curTitle, ': ') !== false) {
// Check if we have an heading containing this exact string, so we
// could assume it's the full title.
$match = false;
for ($i = 1; $i <= 2; $i++) {
foreach ($this->dom->getElementsByTagName('h' . $i) as $hTag) {
// Trim texts to avoid having false negatives when the title is surrounded by spaces or tabs
if (trim($hTag->nodeValue) === trim($curTitle)) {
$match = true;
}
}
}
// If we don't, let's extract the title out of the original title string.
if (!$match) {
$curTitle = substr($originalTitle, strrpos($originalTitle, ':') + 1);
// If the title is now too short, try the first colon instead:
if (count(preg_split('/\s+/', $curTitle)) < 3) {
$curTitle = substr($originalTitle, strpos($originalTitle, ':') + 1);
}
}
} elseif (mb_strlen($curTitle) > 150 || mb_strlen($curTitle) < 15) {
$hOnes = $this->dom->getElementsByTagName('h1');
if ($hOnes->length === 1) {
$curTitle = $hOnes->item(0)->nodeValue;
}
}
$curTitle = trim($curTitle);
/*
* If we now have 4 words or fewer as our title, and either no
* 'hierarchical' separators (\, /, > or ») were found in the original
* title or we decreased the number of words by more than 1 word, use
* the original title.
*/
$curTitleWordCount = count(preg_split('/\s+/', $curTitle));
$originalTitleWordCount = count(preg_split('/\s+/', preg_replace('/[\|\-\\\\\/>»]+/', '', $originalTitle))) - 1;
if ($curTitleWordCount <= 4 &&
(!$titleHadHierarchicalSeparators || $curTitleWordCount !== $originalTitleWordCount)) {
$curTitle = $originalTitle;
}
return $curTitle;
}
/**
* Gets nodes from the root element.
*
* @param $node Readability
*
* @return array
*/
private function getNodes(Readability $node)
{
$stripUnlikelyCandidates = $this->getConfig()->getOption('stripUnlikelyCandidates');
$elementsToScore = [];
/*
* First, node prepping. Trash nodes that look cruddy (like ones with the
* class name "comment", etc), and turn divs into P tags where they have been
* used inappropriately (as in, where they contain no other block level elements.)
*/
while ($node) {
$matchString = $node->getAttribute('class') . ' ' . $node->getAttribute('id');
// Remove DOMComments nodes as we don't need them and mess up children counting
if ($node->nodeTypeEqualsTo(XML_COMMENT_NODE)) {
$node = $node->removeAndGetNext($node);
continue;
}
// Check to see if this node is a byline, and remove it if it is.
if ($this->checkByline($node, $matchString)) {
$node = $node->removeAndGetNext($node);
continue;
}
// Remove unlikely candidates
if ($stripUnlikelyCandidates) {
if (
preg_match($this->regexps['unlikelyCandidates'], $matchString) &&
!preg_match($this->regexps['okMaybeItsACandidate'], $matchString) &&
!$node->tagNameEqualsTo('body') &&
!$node->tagNameEqualsTo('a')
) {
$node = $node->removeAndGetNext($node);
continue;
}
}
// Remove DIV, SECTION, and HEADER nodes without any content(e.g. text, image, video, or iframe).
if (($node->tagNameEqualsTo('div') || $node->tagNameEqualsTo('section') || $node->tagNameEqualsTo('header') ||
$node->tagNameEqualsTo('h1') || $node->tagNameEqualsTo('h2') || $node->tagNameEqualsTo('h3') ||
$node->tagNameEqualsTo('h4') || $node->tagNameEqualsTo('h5') || $node->tagNameEqualsTo('h6') ||
$node->tagNameEqualsTo('p')) &&
$node->isElementWithoutContent()) {
$node = $node->removeAndGetNext($node);
continue;
}
if (in_array(strtolower($node->getTagName()), $this->defaultTagsToScore)) {
$elementsToScore[] = $node;
}
// Turn all divs that don't have children block level elements into p's
if ($node->tagNameEqualsTo('div')) {
/*
* Sites like http://mobile.slate.com encloses each paragraph with a DIV
* element. DIVs with only a P element inside and no text content can be
* safely converted into plain P elements to avoid confusing the scoring
* algorithm with DIVs with are, in practice, paragraphs.
*/
if ($this->hasSinglePNode($node)) {
$pNode = $node->getChildren(true)[0];
$node->replaceChild($pNode);
$node = $pNode;
$elementsToScore[] = $node;
} elseif (!$this->hasSingleChildBlockElement($node)) {
$node->setNodeTag('p');
$elementsToScore[] = $node;
} else {
// EXPERIMENTAL
foreach ($node->getChildren() as $child) {
/** @var Readability $child */
if ($child->isText() && mb_strlen(trim($child->getTextContent())) > 0) {
$newNode = $node->createNode($child, 'p');
$child->replaceChild($newNode);
}
}
}
}
$node = $node->getNextNode($node);
}
return $elementsToScore;
}
/**
* Assign scores to each node. This function will rate each node and return a Readability object for each one.
*
* @param array $nodes
*
* @return DOMDocument|bool
*/
private function rateNodes($nodes)
{
$candidates = [];
/** @var Readability $node */
foreach ($nodes as $node) {
if (!$node->getParent()) {
continue;
}
// Discard nodes with less than 25 characters, without blank space
if (mb_strlen($node->getTextContent(true)) < 25) {
continue;
}
$ancestors = $node->getNodeAncestors();
// Exclude nodes with no ancestor
if (count($ancestors) === 0) {
continue;
}
// Start with a point for the paragraph itself as a base.
$contentScore = 1;
// Add points for any commas within this paragraph.
$contentScore += count(explode(',', $node->getTextContent(true)));
// For every 100 characters in this paragraph, add another point. Up to 3 points.
$contentScore += min(floor(mb_strlen($node->getTextContent(true)) / 100), 3);
// Initialize and score ancestors.
/** @var Readability $ancestor */
foreach ($ancestors as $level => $ancestor) {
if (!$ancestor->isInitialized()) {
$ancestor->initializeNode();
$candidates[] = $ancestor;
}
/*
* Node score divider:
* - parent: 1 (no division)
* - grandparent: 2
* - great grandparent+: ancestor level * 3
*/
if ($level === 0) {
$scoreDivider = 1;
} elseif ($level === 1) {
$scoreDivider = 2;
} else {
$scoreDivider = $level * 3;
}
$currentScore = $ancestor->getContentScore();
$ancestor->setContentScore($currentScore + ($contentScore / $scoreDivider));
}
}
/*
* TODO This is an horrible hack because I don't know how to properly pass by reference.
* When candidates are added to the $candidates array, they lose the reference to the original object
* and on each loop, the object inside $candidates doesn't get updated. This function restores the score
* by getting it of the data-readability tag. This should be fixed using proper references and good coding
* practices (which I lack)
*/
foreach ($candidates as $candidate) {
$candidate->reloadScore();
}
/*
* After we've calculated scores, loop through all of the possible
* candidate nodes we found and find the one with the highest score.
*/
$topCandidates = [];
foreach ($candidates as $candidate) {
/*
* Scale the final candidates score based on link density. Good content
* should have a relatively small link density (5% or less) and be mostly
* unaffected by this operation.
*/
$candidate->setContentScore($candidate->getContentScore() * (1 - $this->getLinkDensity($candidate)));
for ($i = 0; $i < $this->getConfig()->getOption('maxTopCandidates'); $i++) {
$aTopCandidate = isset($topCandidates[$i]) ? $topCandidates[$i] : null;
if (!$aTopCandidate || $candidate->getContentScore() > $aTopCandidate->getContentScore()) {
array_splice($topCandidates, $i, 0, [$candidate]);
if (count($topCandidates) > $this->getConfig()->getOption('maxTopCandidates')) {
array_pop($topCandidates);
}
break;
}
}
}
$topCandidate = isset($topCandidates[0]) ? $topCandidates[0] : null;
$neededToCreateTopCandidate = false;
$parentOfTopCandidate = null;
/*
* If we still have no top candidate, just use the body as a last resort.
* We also have to copy the body node so it is something we can modify.
*/
if ($topCandidate === null || $topCandidate->tagNameEqualsTo('body')) {
// Move all of the page's children into topCandidate
$topCandidate = new DOMDocument('1.0', 'utf-8');
$topCandidate->encoding = 'UTF-8';
$topCandidate->appendChild($topCandidate->createElement('div', ''));
$kids = $this->dom->getElementsByTagName('body')->item(0)->childNodes;
// Cannot be foreached, don't ask me why.
for ($i = 0; $i < $kids->length; $i++) {
$import = $topCandidate->importNode($kids->item($i), true);
$topCandidate->firstChild->appendChild($import);
}
// Readability must be created using firstChild to grab the DOMElement instead of the DOMDocument.
$topCandidate = new Readability($topCandidate->firstChild);
$topCandidate->initializeNode();
//TODO on the original code, $topCandidate is added to the page variable, which holds the whole HTML
// Should be done this here also? (line 823 in readability.js)
} elseif ($topCandidate) {
// Find a better top candidate node if it contains (at least three) nodes which belong to `topCandidates` array
// and whose scores are quite closed with current `topCandidate` node.
$alternativeCandidateAncestors = [];
for ($i = 1; $i < count($topCandidates); $i++) {
if ($topCandidates[$i]->getContentScore() / $topCandidate->getContentScore() >= 0.75) {
array_push($alternativeCandidateAncestors, $topCandidates[$i]->getNodeAncestors(false));
}
}
$MINIMUM_TOPCANDIDATES = 3;
if (count($alternativeCandidateAncestors) >= $MINIMUM_TOPCANDIDATES) {
$parentOfTopCandidate = $topCandidate->getParent();
while (!$parentOfTopCandidate->tagNameEqualsTo('body')) {
$listsContainingThisAncestor = 0;
for ($ancestorIndex = 0; $ancestorIndex < count($alternativeCandidateAncestors) && $listsContainingThisAncestor < $MINIMUM_TOPCANDIDATES; $ancestorIndex++) {
$listsContainingThisAncestor += (int)in_array($parentOfTopCandidate, $alternativeCandidateAncestors[$ancestorIndex]);
}
if ($listsContainingThisAncestor >= $MINIMUM_TOPCANDIDATES) {
$topCandidate = $parentOfTopCandidate;
break;
}
$parentOfTopCandidate = $parentOfTopCandidate->getParent();
}
}
/*
* Because of our bonus system, parents of candidates might have scores
* themselves. They get half of the node. There won't be nodes with higher
* scores than our topCandidate, but if we see the score going *up* in the first
* few steps up the tree, that's a decent sign that there might be more content
* lurking in other places that we want to unify in. The sibling stuff
* below does some of that - but only if we've looked high enough up the DOM
* tree.
*/
$parentOfTopCandidate = $topCandidate->getParent();
$lastScore = $topCandidate->getContentScore();
// The scores shouldn't get too low.
$scoreThreshold = $lastScore / 3;
/* @var Readability $parentOfTopCandidate */
while (!$parentOfTopCandidate->tagNameEqualsTo('body')) {
$parentScore = $parentOfTopCandidate->getContentScore();
if ($parentScore < $scoreThreshold) {
break;
}
if ($parentScore > $lastScore) {
// Alright! We found a better parent to use.
$topCandidate = $parentOfTopCandidate;
break;
}
$lastScore = $parentOfTopCandidate->getContentScore();
$parentOfTopCandidate = $parentOfTopCandidate->getParent();
}
// If the top candidate is the only child, use parent instead. This will help sibling
// joining logic when adjacent content is actually located in parent's sibling node.
$parentOfTopCandidate = $topCandidate->getParent();
while (!$parentOfTopCandidate->tagNameEqualsTo('body') && count($parentOfTopCandidate->getChildren(true)) === 1) {
$topCandidate = $parentOfTopCandidate;
$parentOfTopCandidate = $topCandidate->getParent();
}
}
/*
* Now that we have the top candidate, look through its siblings for content
* that might also be related. Things like preambles, content split by ads
* that we removed, etc.
*/
$articleContent = new DOMDocument('1.0', 'utf-8');
$articleContent->createElement('div');
$siblingScoreThreshold = max(10, $topCandidate->getContentScore() * 0.2);
// Keep potential top candidate's parent node to try to get text direction of it later.
$parentOfTopCandidate = $topCandidate->getParent();
$siblings = $parentOfTopCandidate->getChildren();
$hasContent = false;
/** @var Readability $sibling */
foreach ($siblings as $sibling) {
$append = false;
if ($sibling->compareNodes($sibling, $topCandidate)) {
$append = true;
} else {
$contentBonus = 0;
// Give a bonus if sibling nodes and top candidates have the example same classname
if ($sibling->getAttribute('class') === $topCandidate->getAttribute('class') && $topCandidate->getAttribute('class') !== '') {
$contentBonus += $topCandidate->getContentScore() * 0.2;
}
if ($sibling->getContentScore() + $contentBonus >= $siblingScoreThreshold) {
$append = true;
} elseif ($sibling->tagNameEqualsTo('p')) {
$linkDensity = $this->getLinkDensity($sibling);
$nodeContent = $sibling->getTextContent(true);
if (mb_strlen($nodeContent) > 80 && $linkDensity < 0.25) {
$append = true;
} elseif ($nodeContent && mb_strlen($nodeContent) < 80 && $linkDensity === 0 && preg_match('/\.( |$)/', $nodeContent)) {
$append = true;
}
}
}
if ($append) {
$hasContent = true;
if (!in_array(strtolower($sibling->getTagName()), $this->alterToDIVExceptions)) {
/*
* We have a node that isn't a common block level element, like a form or td tag.
* Turn it into a div so it doesn't get filtered out later by accident.
*/
$sibling->setNodeTag('div');
}
$import = $articleContent->importNode($sibling->getDOMNode(), true);
$articleContent->appendChild($import);
/*
* No node shifting needs to be check because when calling getChildren, an array is made with the
* children of the parent node, instead of using the DOMElement childNodes function, which, when used
* along with appendChild, would shift the nodes position and the current foreach will behave in
* unpredictable ways.
*/
}
}
$articleContent = $this->prepArticle($articleContent);
if ($hasContent) {
// Find out text direction from ancestors of final top candidate.
$ancestors = array_merge([$parentOfTopCandidate, $topCandidate], $parentOfTopCandidate->getNodeAncestors());
foreach ($ancestors as $ancestor) {
$articleDir = $ancestor->getAttribute('dir');
if ($articleDir) {
$this->metadata['articleDir'] = $articleDir;
break;
}
}
return $articleContent;
} else {
return false;
}
}
/**
* TODO To be moved to Readability.
*
* @param DOMDocument $article
*
* @return DOMDocument
*/
public function prepArticle(DOMDocument $article)
{
$this->_cleanStyles($article);
$this->_clean($article, 'style');
// Check for data tables before we continue, to avoid removing items in
// those tables, which will often be isolated even though they're
// visually linked to other content-ful elements (text, images, etc.).
$this->_markDataTables($article);
// Clean out junk from the article content
$this->_cleanConditionally($article, 'form');
$this->_cleanConditionally($article, 'fieldset');
$this->_clean($article, 'object');
$this->_clean($article, 'embed');
$this->_clean($article, 'h1');
$this->_clean($article, 'footer');
// Clean out elements have "share" in their id/class combinations from final top candidates,
// which means we don't remove the top candidates even they have "share".
foreach ($article->childNodes as $child) {
$this->_cleanMatchedNodes($child, '/share/i');
}
/*
* If there is only one h2 and its text content substantially equals article title,
* they are probably using it as a header and not a subheader,
* so remove it since we already extract the title separately.
*/
$h2 = $article->getElementsByTagName('h2');
if ($h2->length === 1) {
$lengthSimilarRate = (mb_strlen($h2->item(0)->textContent) - mb_strlen($this->metadata['title'])) / mb_strlen($this->metadata['title']);
if (abs($lengthSimilarRate) < 0.5) {
if ($lengthSimilarRate > 0) {
$titlesMatch = strpos($h2->item(0)->textContent, $this->metadata['title']) !== false;
} else {
$titlesMatch = strpos($this->metadata['title'], $h2->item(0)->textContent) !== false;
}
if ($titlesMatch) {
$this->_clean($article, 'h2');
}
}
}
$this->_clean($article, 'iframe');
$this->_clean($article, 'input');
$this->_clean($article, 'textarea');
$this->_clean($article, 'select');
$this->_clean($article, 'button');
$this->_cleanHeaders($article);
// Do these last as the previous stuff may have removed junk
// that will affect these
$this->_cleanConditionally($article, 'table');
$this->_cleanConditionally($article, 'ul');
$this->_cleanConditionally($article, 'div');
$this->_cleanExtraParagraphs($article);
$this->_cleanReadabilityTags($article);
foreach (iterator_to_array($article->getElementsByTagName('br')) as $br) {
$next = $br->nextSibling;
if ($next && $next->nodeName === 'p') {
$br->parentNode->removeChild($br);
}
}
return $article;
}
/**
* Look for 'data' (as opposed to 'layout') tables, for which we use
* similar checks as
* https://dxr.mozilla.org/mozilla-central/rev/71224049c0b52ab190564d3ea0eab089a159a4cf/accessible/html/HTMLTableAccessible.cpp#920.
*
* TODO To be moved to Readability. WARNING: check if we actually keep the "readabilityDataTable" param and
* maybe switch to a readability data-tag?
*
* @param DOMDocument $article
*
* @return void
*/
public function _markDataTables(DOMDocument $article)
{
$tables = $article->getElementsByTagName('table');
foreach ($tables as $table) {
/** @var \DOMElement $table */
$role = $table->getAttribute('role');
if ($role === 'presentation') {
$table->readabilityDataTable = false;
continue;
}
$datatable = $table->getAttribute('datatable');
if ($datatable == '0') {
$table->readabilityDataTable = false;
continue;
}
$summary = $table->getAttribute('summary');
if ($summary) {
$table->readabilityDataTable = true;
continue;
}
$caption = $table->getElementsByTagName('caption');
if ($caption->length > 0 && $caption->item(0)->childNodes->length > 0) {
$table->readabilityDataTable = true;
continue;
}
// If the table has a descendant with any of these tags, consider a data table:
foreach (['col', 'colgroup', 'tfoot', 'thead', 'th'] as $dataTableDescendants) {
if ($table->getElementsByTagName($dataTableDescendants)->length > 0) {
$table->readabilityDataTable = true;
continue 2;
}
}
// Nested tables indicate a layout table:
if ($table->getElementsByTagName('table')->length > 0) {
$table->readabilityDataTable = false;
continue;
}
$sizeInfo = $this->_getRowAndColumnCount($table);
if ($sizeInfo['rows'] >= 10 || $sizeInfo['columns'] > 4) {
$table->readabilityDataTable = true;
continue;
}
// Now just go by size entirely:
$table->readabilityDataTable = $sizeInfo['rows'] * $sizeInfo['columns'] > 10;
}
}
/**
* Return an array indicating how many rows and columns this table has.
*
* @param \DOMElement $table
*
* @return array
*/
public function _getRowAndColumnCount(\DOMElement $table)
{
$rows = $columns = 0;
$trs = $table->getElementsByTagName('tr');
foreach ($trs as $tr) {
/** @var \DOMElement $tr */
$rowspan = $tr->getAttribute('rowspan');
$rows += ($rowspan || 1);
// Now look for column-related info
$columnsInThisRow = 0;
$cells = $tr->getElementsByTagName('td');
foreach ($cells as $cell) {
/** @var \DOMElement $cell */
$colspan = $cell->getAttribute('colspan');
$columnsInThisRow += ($colspan || 1);
}
$columns = max($columns, $columnsInThisRow);
}
return ['rows' => $rows, 'columns' => $columns];
}
/**
* TODO To be moved to Readability.
*
* @param DOMDocument $article
*
* @return void
*/
public function _cleanReadabilityTags(DOMDocument $article)
{
if ($this->getConfig()->getOption('removeReadabilityTags')) {
foreach ($article->getElementsByTagName('*') as $tag) {
if ($tag->hasAttribute('data-readability')) {
$tag->removeAttribute('data-readability');
}
}
}
}
/**
* Remove the style attribute on every e and under.
* TODO: To be moved to Readability.
*
* @param $node \DOMDocument|\DOMNode
**/
public function _cleanStyles($node)
{
if (property_exists($node, 'tagName') && $node->tagName === 'svg') {
return;
}
// Do not bother if there's no method to remove an attribute
if (method_exists($node, 'removeAttribute')) {
$presentational_attributes = ['align', 'background', 'bgcolor', 'border', 'cellpadding', 'cellspacing', 'frame', 'hspace', 'rules', 'style', 'valign', 'vspace'];
// Remove `style` and deprecated presentational attributes
foreach ($presentational_attributes as $presentational_attribute) {
$node->removeAttribute($presentational_attribute);
}
$deprecated_size_attribute_elems = ['table', 'th', 'td', 'hr', 'pre'];
if (property_exists($node, 'tagName') && in_array($node->tagName, $deprecated_size_attribute_elems)) {
$node->removeAttribute('width');
$node->removeAttribute('height');
}
}
$cur = $node->firstChild;
while ($cur !== null) {
$this->_cleanStyles($cur);
$cur = $cur->nextSibling;
}
}
/**
* Clean out elements whose id/class combinations match specific string.
*
* TODO To be moved to readability
*
* @param string $regex Match id/class combination.
*
* @return void
**/
public function _cleanMatchedNodes($node, $regex)
{
$node = new Readability($node);
$endOfSearchMarkerNode = $node->getNextNode($node, true);
$next = $node->getNextNode($node);
while ($next && $next !== $endOfSearchMarkerNode) {
if (preg_match($regex, sprintf('%s %s', $next->getAttribute('class'), $next->getAttribute('id')))) {
$next = $next->removeAndGetNext($next);
} else {
$next = $next->getNextNode($next);
}
}
}
/**
* TODO To be moved to Readability.
*
* @param DOMDocument $article
*
* @return void
*/
public function _cleanExtraParagraphs(DOMDocument $article)
{
$paragraphs = $article->getElementsByTagName('p');
$length = $paragraphs->length;
for ($i = 0; $i < $length; $i++) {
$paragraph = $paragraphs->item($length - 1 - $i);
$imgCount = $paragraph->getElementsByTagName('img')->length;
$embedCount = $paragraph->getElementsByTagName('embed')->length;
$objectCount = $paragraph->getElementsByTagName('object')->length;
// At this point, nasty iframes have been removed, only remain embedded video ones.
$iframeCount = $paragraph->getElementsByTagName('iframe')->length;
$totalCount = $imgCount + $embedCount + $objectCount + $iframeCount;
if ($totalCount === 0 && !preg_replace($this->regexps['onlyWhitespace'], '', $paragraph->textContent)) {
// TODO must be done via readability
$paragraph->parentNode->removeChild($paragraph);
}
}
}
/**
* TODO To be moved to Readability.
*
* @param DOMDocument $article
*
* @return void
*/
public function _cleanConditionally(DOMDocument $article, $tag)
{
if (!$this->getConfig()->getOption('cleanConditionally')) {
return;
}
$isList = in_array($tag, ['ul', 'ol']);
/*
* Gather counts for other typical elements embedded within.
* Traverse backwards so we can remove nodes at the same time
* without effecting the traversal.
*/
$DOMNodeList = $article->getElementsByTagName($tag);
$length = $DOMNodeList->length;
for ($i = 0; $i < $length; $i++) {
$node = $DOMNodeList->item($length - 1 - $i);
$node = new Readability($node);
// First check if we're in a data table, in which case don't remove us.
if ($node->hasAncestorTag($node, 'table', -1) && isset($node->readabilityDataTable)) {
continue;
}
$weight = $node->getClassWeight();
if ($weight < 0) {
$this->removeNode($node->getDOMNode());
continue;
}
if (substr_count($node->getTextContent(), ',') < 10) {
/*
* If there are not very many commas, and the number of
* non-paragraph elements is more than paragraphs or other
* ominous signs, remove the element.
*/
// TODO Horrible hack, must be removed once this function is inside Readability
$p = $node->getDOMNode()->getElementsByTagName('p')->length;
$img = $node->getDOMNode()->getElementsByTagName('img')->length;
$li = $node->getDOMNode()->getElementsByTagName('li')->length - 100;
$input = $node->getDOMNode()->getElementsByTagName('input')->length;
$embedCount = 0;
$embeds = $node->getDOMNode()->getElementsByTagName('embed');
foreach ($embeds as $embedNode) {
if (preg_match($this->regexps['videos'], $embedNode->C14N())) {
$embedCount++;
}
}
$linkDensity = $this->getLinkDensity($node);
$contentLength = mb_strlen($node->getTextContent(true));
$haveToRemove =
($img > 1 && $p / $img < 0.5 && !$node->hasAncestorTag($node, 'figure')) ||
(!$isList && $li > $p) ||
($input > floor($p / 3)) ||
(!$isList && $contentLength < 25 && ($img === 0 || $img > 2) && !$node->hasAncestorTag($node, 'figure')) ||
(!$isList && $weight < 25 && $linkDensity > 0.2) ||
($weight >= 25 && $linkDensity > 0.5) ||
(($embedCount === 1 && $contentLength < 75) || $embedCount > 1);
if ($haveToRemove) {
$this->removeNode($node->getDOMNode());
}
}
}
}
/**
* Clean a node of all elements of type "tag".
* (Unless it's a youtube/vimeo video. People love movies.).
*
* TODO To be moved to Readability
*
* @param $article DOMDocument
* @param $tag string tag to clean
*
* @return void
**/
public function _clean(DOMDocument $article, $tag)
{
$isEmbed = in_array($tag, ['object', 'embed', 'iframe']);
$DOMNodeList = $article->getElementsByTagName($tag);
$length = $DOMNodeList->length;
for ($i = 0; $i < $length; $i++) {
$item = $DOMNodeList->item($length - 1 - $i);
// Allow youtube and vimeo videos through as people usually want to see those.
if ($isEmbed) {
$attributeValues = [];
foreach ($item->attributes as $name => $value) {
$attributeValues[] = $value->nodeValue;
}
$attributeValues = implode('|', $attributeValues);
// First, check the elements attributes to see if any of them contain youtube or vimeo
if (preg_match($this->regexps['videos'], $attributeValues)) {
continue;
}
// Then check the elements inside this element for the same.
if (preg_match($this->regexps['videos'], $item->C14N())) {
continue;
}
}
$this->removeNode($item);
}
}
/**
* Clean out spurious headers from an Element. Checks things like classnames and link density.
*
* TODO To be moved to Readability
*
* @param DOMDocument $article
*
* @return void
**/
public function _cleanHeaders(DOMDocument $article)
{
for ($headerIndex = 1; $headerIndex < 3; $headerIndex++) {
$headers = $article->getElementsByTagName('h' . $headerIndex);
foreach ($headers as $header) {
$header = new Readability($header);
if ($header->getClassWeight() < 0) {
$this->removeNode($header->getDOMNode());
}
}
}
}
/**
* Remove the passed node.
*
* TODO To be moved to Readability
*
* @param \DOMNode $node
*
* @return void
**/
public function removeNode(\DOMNode $node)
{
$parent = $node->parentNode;
if ($parent) {
$parent->removeChild($node);
}
}
/**
* Checks if the node is a byline.
*
* @param Readability $node
* @param string $matchString
*
* @return bool
*/
private function checkByline($node, $matchString)
{
if (!$this->getConfig()->getOption('articleByLine')) {
return false;
}
/*
* Check if the byline is already set
*/
if (isset($this->metadata['byline'])) {
return false;
}
$rel = $node->getAttribute('rel');
if ($rel === 'author' || preg_match($this->regexps['byline'], $matchString) && $this->isValidByline($node->getTextContent())) {
$this->metadata['byline'] = trim($node->getTextContent());
return true;
}
return false;
}
/**
* Checks the validity of a byLine. Based on string length.
*
* @param string $text
*
* @return bool
*/
private function isValidByline($text)
{
if (gettype($text) == 'string') {
$byline = trim($text);
return (mb_strlen($byline) > 0) && (mb_strlen($text) < 100);
}
return false;
}
/**
* Checks if the current node has a single child and if that child is a P node.
* Useful to convert <div><p> nodes to a single <p> node and avoid confusing the scoring system since div with p
* tags are, in practice, paragraphs.
*
* @param Readability $node
*
* @return bool
*/
private function hasSinglePNode(Readability $node)
{
// There should be exactly 1 element child which is a P:
if (count($children = $node->getChildren(true)) !== 1 || !$children[0]->tagNameEqualsTo('p')) {
return false;
}
// And there should be no text nodes with real content (param true on ->getChildren)
foreach ($children as $child) {
/** @var $child Readability */
if ($child->nodeTypeEqualsTo(XML_TEXT_NODE) && !preg_match('/\S$/', $child->getTextContent())) {
return false;
}
}
return true;
}
private function hasSingleChildBlockElement(Readability $node)
{
$result = false;
if ($node->hasChildren()) {
/** @var Readability $child */
foreach ($node->getChildren() as $child) {
if (in_array($child->getTagName(), $this->divToPElements)) {
$result = true;
} else {
// If any of the hasSingleChildBlockElement calls return true, return true then.
$result = ($result || $this->hasSingleChildBlockElement($child));
}
}
}
return $result;
}
}
|