summaryrefslogtreecommitdiff
path: root/includes/Linker.php
blob: b58dabab9d597b456469ebe17b097a74ed5eb198 (plain)
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
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
<?php
/**
 * Methods to make links and related items.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * Some internal bits split of from Skin.php. These functions are used
 * for primarily page content: links, embedded images, table of contents. Links
 * are also used in the skin.
 *
 * @todo turn this into a legacy interface for HtmlPageLinkRenderer and similar services.
 *
 * @ingroup Skins
 */
class Linker {
	/**
	 * Flags for userToolLinks()
	 */
	const TOOL_LINKS_NOBLOCK = 1;
	const TOOL_LINKS_EMAIL = 2;

	/**
	 * Get the appropriate HTML attributes to add to the "a" element of an interwiki link.
	 *
	 * @deprecated since 1.25
	 *
	 * @param string $title The title text for the link, URL-encoded (???) but
	 *   not HTML-escaped
	 * @param string $unused Unused
	 * @param string $class The contents of the class attribute; if an empty
	 *   string is passed, which is the default value, defaults to 'external'.
	 * @return string
	 */
	static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
		global $wgContLang;

		wfDeprecated( __METHOD__, '1.25' );

		# @todo FIXME: We have a whole bunch of handling here that doesn't happen in
		# getExternalLinkAttributes, why?
		$title = urldecode( $title );
		$title = $wgContLang->checkTitleEncoding( $title );
		$title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );

		return self::getLinkAttributesInternal( $title, $class );
	}

	/**
	 * Get the appropriate HTML attributes to add to the "a" element of an internal link.
	 *
	 * @deprecated since 1.25
	 *
	 * @param string $title The title text for the link, URL-encoded (???) but
	 *   not HTML-escaped
	 * @param string $unused Unused
	 * @param string $class The contents of the class attribute, default none
	 * @return string
	 */
	static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
		wfDeprecated( __METHOD__, '1.25' );

		$title = urldecode( $title );
		$title = str_replace( '_', ' ', $title );
		return self::getLinkAttributesInternal( $title, $class );
	}

	/**
	 * Get the appropriate HTML attributes to add to the "a" element of an internal
	 * link, given the Title object for the page we want to link to.
	 *
	 * @deprecated since 1.25
	 *
	 * @param Title $nt
	 * @param string $unused Unused
	 * @param string $class The contents of the class attribute, default none
	 * @param string|bool $title Optional (unescaped) string to use in the title
	 *   attribute; if false, default to the name of the page we're linking to
	 * @return string
	 */
	static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
		wfDeprecated( __METHOD__, '1.25' );

		if ( $title === false ) {
			$title = $nt->getPrefixedText();
		}
		return self::getLinkAttributesInternal( $title, $class );
	}

	/**
	 * Common code for getLinkAttributesX functions
	 *
	 * @deprecated since 1.25
	 *
	 * @param string $title
	 * @param string $class
	 *
	 * @return string
	 */
	private static function getLinkAttributesInternal( $title, $class ) {
		wfDeprecated( __METHOD__, '1.25' );

		$title = htmlspecialchars( $title );
		$class = htmlspecialchars( $class );
		$r = '';
		if ( $class != '' ) {
			$r .= " class=\"$class\"";
		}
		if ( $title != '' ) {
			$r .= " title=\"$title\"";
		}
		return $r;
	}

	/**
	 * Return the CSS colour of a known link
	 *
	 * @param Title $t
	 * @param int $threshold User defined threshold
	 * @return string CSS class
	 */
	public static function getLinkColour( $t, $threshold ) {
		$colour = '';
		if ( $t->isRedirect() ) {
			# Page is a redirect
			$colour = 'mw-redirect';
		} elseif ( $threshold > 0 && $t->isContentPage() &&
			$t->exists() && $t->getLength() < $threshold
		) {
			# Page is a stub
			$colour = 'stub';
		}
		return $colour;
	}

	/**
	 * This function returns an HTML link to the given target.  It serves a few
	 * purposes:
	 *   1) If $target is a Title, the correct URL to link to will be figured
	 *      out automatically.
	 *   2) It automatically adds the usual classes for various types of link
	 *      targets: "new" for red links, "stub" for short articles, etc.
	 *   3) It escapes all attribute values safely so there's no risk of XSS.
	 *   4) It provides a default tooltip if the target is a Title (the page
	 *      name of the target).
	 * link() replaces the old functions in the makeLink() family.
	 *
	 * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
	 *
	 * @param Title $target Can currently only be a Title, but this may
	 *   change to support Images, literal URLs, etc.
	 * @param string $html The HTML contents of the <a> element, i.e.,
	 *   the link text.  This is raw HTML and will not be escaped.  If null,
	 *   defaults to the prefixed text of the Title; or if the Title is just a
	 *   fragment, the contents of the fragment.
	 * @param array $customAttribs A key => value array of extra HTML attributes,
	 *   such as title and class.  (href is ignored.)  Classes will be
	 *   merged with the default classes, while other attributes will replace
	 *   default attributes.  All passed attribute values will be HTML-escaped.
	 *   A false attribute value means to suppress that attribute.
	 * @param array $query The query string to append to the URL
	 *   you're linking to, in key => value array form.  Query keys and values
	 *   will be URL-encoded.
	 * @param string|array $options String or array of strings:
	 *     'known': Page is known to exist, so don't check if it does.
	 *     'broken': Page is known not to exist, so don't check if it does.
	 *     'noclasses': Don't add any classes automatically (includes "new",
	 *       "stub", "mw-redirect", "extiw").  Only use the class attribute
	 *       provided, if any, so you get a simple blue link with no funny i-
	 *       cons.
	 *     'forcearticlepath': Use the article path always, even with a querystring.
	 *       Has compatibility issues on some setups, so avoid wherever possible.
	 *     'http': Force a full URL with http:// as the scheme.
	 *     'https': Force a full URL with https:// as the scheme.
	 * @return string HTML <a> attribute
	 */
	public static function link(
		$target, $html = null, $customAttribs = array(), $query = array(), $options = array()
	) {
		if ( !$target instanceof Title ) {
			wfWarn( __METHOD__ . ': Requires $target to be a Title object.', 2 );
			return "<!-- ERROR -->$html";
		}

		if ( is_string( $query ) ) {
			// some functions withing core using this still hand over query strings
			wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
			$query = wfCgiToArray( $query );
		}
		$options = (array)$options;

		$dummy = new DummyLinker; // dummy linker instance for bc on the hooks

		$ret = null;
		if ( !Hooks::run( 'LinkBegin',
			array( $dummy, $target, &$html, &$customAttribs, &$query, &$options, &$ret ) )
		) {
			return $ret;
		}

		# Normalize the Title if it's a special page
		$target = self::normaliseSpecialPage( $target );

		# If we don't know whether the page exists, let's find out.
		if ( !in_array( 'known', $options ) && !in_array( 'broken', $options ) ) {
			if ( $target->isKnown() ) {
				$options[] = 'known';
			} else {
				$options[] = 'broken';
			}
		}

		$oldquery = array();
		if ( in_array( "forcearticlepath", $options ) && $query ) {
			$oldquery = $query;
			$query = array();
		}

		# Note: we want the href attribute first, for prettiness.
		$attribs = array( 'href' => self::linkUrl( $target, $query, $options ) );
		if ( in_array( 'forcearticlepath', $options ) && $oldquery ) {
			$attribs['href'] = wfAppendQuery( $attribs['href'], $oldquery );
		}

		$attribs = array_merge(
			$attribs,
			self::linkAttribs( $target, $customAttribs, $options )
		);
		if ( is_null( $html ) ) {
			$html = self::linkText( $target );
		}

		$ret = null;
		if ( Hooks::run( 'LinkEnd', array( $dummy, $target, $options, &$html, &$attribs, &$ret ) ) ) {
			$ret = Html::rawElement( 'a', $attribs, $html );
		}

		return $ret;
	}

	/**
	 * Identical to link(), except $options defaults to 'known'.
	 * @see Linker::link
	 * @return string
	 */
	public static function linkKnown(
		$target, $html = null, $customAttribs = array(),
		$query = array(), $options = array( 'known', 'noclasses' )
	) {
		return self::link( $target, $html, $customAttribs, $query, $options );
	}

	/**
	 * Returns the Url used to link to a Title
	 *
	 * @param Title $target
	 * @param array $query Query parameters
	 * @param array $options
	 * @return string
	 */
	private static function linkUrl( $target, $query, $options ) {
		# We don't want to include fragments for broken links, because they
		# generally make no sense.
		if ( in_array( 'broken', $options ) && $target->hasFragment() ) {
			$target = clone $target;
			$target->setFragment( '' );
		}

		# If it's a broken link, add the appropriate query pieces, unless
		# there's already an action specified, or unless 'edit' makes no sense
		# (i.e., for a nonexistent special page).
		if ( in_array( 'broken', $options ) && empty( $query['action'] )
			&& !$target->isSpecialPage() ) {
			$query['action'] = 'edit';
			$query['redlink'] = '1';
		}

		if ( in_array( 'http', $options ) ) {
			$proto = PROTO_HTTP;
		} elseif ( in_array( 'https', $options ) ) {
			$proto = PROTO_HTTPS;
		} else {
			$proto = PROTO_RELATIVE;
		}

		$ret = $target->getLinkURL( $query, false, $proto );
		return $ret;
	}

	/**
	 * Returns the array of attributes used when linking to the Title $target
	 *
	 * @param Title $target
	 * @param array $attribs
	 * @param array $options
	 *
	 * @return array
	 */
	private static function linkAttribs( $target, $attribs, $options ) {
		global $wgUser;
		$defaults = array();

		if ( !in_array( 'noclasses', $options ) ) {
			# Now build the classes.
			$classes = array();

			if ( in_array( 'broken', $options ) ) {
				$classes[] = 'new';
			}

			if ( $target->isExternal() ) {
				$classes[] = 'extiw';
			}

			if ( !in_array( 'broken', $options ) ) { # Avoid useless calls to LinkCache (see r50387)
				$colour = self::getLinkColour( $target, $wgUser->getStubThreshold() );
				if ( $colour !== '' ) {
					$classes[] = $colour; # mw-redirect or stub
				}
			}
			if ( $classes != array() ) {
				$defaults['class'] = implode( ' ', $classes );
			}
		}

		# Get a default title attribute.
		if ( $target->getPrefixedText() == '' ) {
			# A link like [[#Foo]].  This used to mean an empty title
			# attribute, but that's silly.  Just don't output a title.
		} elseif ( in_array( 'known', $options ) ) {
			$defaults['title'] = $target->getPrefixedText();
		} else {
			$defaults['title'] = wfMessage( 'red-link-title', $target->getPrefixedText() )->text();
		}

		# Finally, merge the custom attribs with the default ones, and iterate
		# over that, deleting all "false" attributes.
		$ret = array();
		$merged = Sanitizer::mergeAttributes( $defaults, $attribs );
		foreach ( $merged as $key => $val ) {
			# A false value suppresses the attribute, and we don't want the
			# href attribute to be overridden.
			if ( $key != 'href' && $val !== false ) {
				$ret[$key] = $val;
			}
		}
		return $ret;
	}

	/**
	 * Default text of the links to the Title $target
	 *
	 * @param Title $target
	 *
	 * @return string
	 */
	private static function linkText( $target ) {
		if ( !$target instanceof Title ) {
			wfWarn( __METHOD__ . ': Requires $target to be a Title object.' );
			return '';
		}
		// If the target is just a fragment, with no title, we return the fragment
		// text.  Otherwise, we return the title text itself.
		if ( $target->getPrefixedText() === '' && $target->hasFragment() ) {
			return htmlspecialchars( $target->getFragment() );
		}

		return htmlspecialchars( $target->getPrefixedText() );
	}

	/**
	 * Make appropriate markup for a link to the current article. This is
	 * currently rendered as the bold link text. The calling sequence is the
	 * same as the other make*LinkObj static functions, despite $query not
	 * being used.
	 *
	 * @param Title $nt
	 * @param string $html [optional]
	 * @param string $query [optional]
	 * @param string $trail [optional]
	 * @param string $prefix [optional]
	 *
	 * @return string
	 */
	public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
		$ret = "<strong class=\"selflink\">{$prefix}{$html}</strong>{$trail}";
		if ( !Hooks::run( 'SelfLinkBegin', array( $nt, &$html, &$trail, &$prefix, &$ret ) ) ) {
			return $ret;
		}

		if ( $html == '' ) {
			$html = htmlspecialchars( $nt->getPrefixedText() );
		}
		list( $inside, $trail ) = self::splitTrail( $trail );
		return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
	}

	/**
	 * Get a message saying that an invalid title was encountered.
	 * This should be called after a method like Title::makeTitleSafe() returned
	 * a value indicating that the title object is invalid.
	 *
	 * @param IContextSource $context Context to use to get the messages
	 * @param int $namespace Namespace number
	 * @param string $title Text of the title, without the namespace part
	 * @return string
	 */
	public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
		global $wgContLang;

		// First we check whether the namespace exists or not.
		if ( MWNamespace::exists( $namespace ) ) {
			if ( $namespace == NS_MAIN ) {
				$name = $context->msg( 'blanknamespace' )->text();
			} else {
				$name = $wgContLang->getFormattedNsText( $namespace );
			}
			return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
		} else {
			return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
		}
	}

	/**
	 * @param Title $title
	 * @return Title
	 */
	static function normaliseSpecialPage( Title $title ) {
		if ( $title->isSpecialPage() ) {
			list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
			if ( !$name ) {
				return $title;
			}
			$ret = SpecialPage::getTitleFor( $name, $subpage, $title->getFragment() );
			return $ret;
		} else {
			return $title;
		}
	}

	/**
	 * Returns the filename part of an url.
	 * Used as alternative text for external images.
	 *
	 * @param string $url
	 *
	 * @return string
	 */
	private static function fnamePart( $url ) {
		$basename = strrchr( $url, '/' );
		if ( false === $basename ) {
			$basename = $url;
		} else {
			$basename = substr( $basename, 1 );
		}
		return $basename;
	}

	/**
	 * Return the code for images which were added via external links,
	 * via Parser::maybeMakeExternalImage().
	 *
	 * @param string $url
	 * @param string $alt
	 *
	 * @return string
	 */
	public static function makeExternalImage( $url, $alt = '' ) {
		if ( $alt == '' ) {
			$alt = self::fnamePart( $url );
		}
		$img = '';
		$success = Hooks::run( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
		if ( !$success ) {
			wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
				. "with url {$url} and alt text {$alt} to {$img}\n", true );
			return $img;
		}
		return Html::element( 'img',
			array(
				'src' => $url,
				'alt' => $alt ) );
	}

	/**
	 * Given parameters derived from [[Image:Foo|options...]], generate the
	 * HTML that that syntax inserts in the page.
	 *
	 * @param Parser $parser
	 * @param Title $title Title object of the file (not the currently viewed page)
	 * @param File $file File object, or false if it doesn't exist
	 * @param array $frameParams Associative array of parameters external to the media handler.
	 *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
	 *     will often be false.
	 *          thumbnail       If present, downscale and frame
	 *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
	 *          framed          Shows image in original size in a frame
	 *          frameless       Downscale but don't frame
	 *          upright         If present, tweak default sizes for portrait orientation
	 *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
	 *          border          If present, show a border around the image
	 *          align           Horizontal alignment (left, right, center, none)
	 *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
	 *                          bottom, text-bottom)
	 *          alt             Alternate text for image (i.e. alt attribute). Plain text.
	 *          class           HTML for image classes. Plain text.
	 *          caption         HTML for image caption.
	 *          link-url        URL to link to
	 *          link-title      Title object to link to
	 *          link-target     Value for the target attribute, only with link-url
	 *          no-link         Boolean, suppress description link
	 *
	 * @param array $handlerParams Associative array of media handler parameters, to be passed
	 *       to transform(). Typical keys are "width" and "page".
	 * @param string|bool $time Timestamp of the file, set as false for current
	 * @param string $query Query params for desc url
	 * @param int|null $widthOption Used by the parser to remember the user preference thumbnailsize
	 * @since 1.20
	 * @return string HTML for an image, with links, wrappers, etc.
	 */
	public static function makeImageLink( Parser $parser, Title $title,
		$file, $frameParams = array(), $handlerParams = array(), $time = false,
		$query = "", $widthOption = null
	) {
		$res = null;
		$dummy = new DummyLinker;
		if ( !Hooks::run( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
			&$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
			return $res;
		}

		if ( $file && !$file->allowInlineDisplay() ) {
			wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
			return self::link( $title );
		}

		// Shortcuts
		$fp =& $frameParams;
		$hp =& $handlerParams;

		// Clean up parameters
		$page = isset( $hp['page'] ) ? $hp['page'] : false;
		if ( !isset( $fp['align'] ) ) {
			$fp['align'] = '';
		}
		if ( !isset( $fp['alt'] ) ) {
			$fp['alt'] = '';
		}
		if ( !isset( $fp['title'] ) ) {
			$fp['title'] = '';
		}
		if ( !isset( $fp['class'] ) ) {
			$fp['class'] = '';
		}

		$prefix = $postfix = '';

		if ( 'center' == $fp['align'] ) {
			$prefix = '<div class="center">';
			$postfix = '</div>';
			$fp['align'] = 'none';
		}
		if ( $file && !isset( $hp['width'] ) ) {
			if ( isset( $hp['height'] ) && $file->isVectorized() ) {
				// If its a vector image, and user only specifies height
				// we don't want it to be limited by its "normal" width.
				global $wgSVGMaxSize;
				$hp['width'] = $wgSVGMaxSize;
			} else {
				$hp['width'] = $file->getWidth( $page );
			}

			if ( isset( $fp['thumbnail'] )
				|| isset( $fp['manualthumb'] )
				|| isset( $fp['framed'] )
				|| isset( $fp['frameless'] )
				|| !$hp['width']
			) {
				global $wgThumbLimits, $wgThumbUpright;

				if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
					$widthOption = User::getDefaultOption( 'thumbsize' );
				}

				// Reduce width for upright images when parameter 'upright' is used
				if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
					$fp['upright'] = $wgThumbUpright;
				}

				// For caching health: If width scaled down due to upright
				// parameter, round to full __0 pixel to avoid the creation of a
				// lot of odd thumbs.
				$prefWidth = isset( $fp['upright'] ) ?
					round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
					$wgThumbLimits[$widthOption];

				// Use width which is smaller: real image width or user preference width
				// Unless image is scalable vector.
				if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
						$prefWidth < $hp['width'] || $file->isVectorized() ) ) {
					$hp['width'] = $prefWidth;
				}
			}
		}

		if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
			# Create a thumbnail. Alignment depends on the writing direction of
			# the page content language (right-aligned for LTR languages,
			# left-aligned for RTL languages)
			#
			# If a thumbnail width has not been provided, it is set
			# to the default user option as specified in Language*.php
			if ( $fp['align'] == '' ) {
				$fp['align'] = $parser->getTargetLanguage()->alignEnd();
			}
			return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
		}

		if ( $file && isset( $fp['frameless'] ) ) {
			$srcWidth = $file->getWidth( $page );
			# For "frameless" option: do not present an image bigger than the
			# source (for bitmap-style images). This is the same behavior as the
			# "thumb" option does it already.
			if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
				$hp['width'] = $srcWidth;
			}
		}

		if ( $file && isset( $hp['width'] ) ) {
			# Create a resized image, without the additional thumbnail features
			$thumb = $file->transform( $hp );
		} else {
			$thumb = false;
		}

		if ( !$thumb ) {
			$s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
		} else {
			self::processResponsiveImages( $file, $thumb, $hp );
			$params = array(
				'alt' => $fp['alt'],
				'title' => $fp['title'],
				'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
				'img-class' => $fp['class'] );
			if ( isset( $fp['border'] ) ) {
				$params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
			}
			$params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;

			$s = $thumb->toHtml( $params );
		}
		if ( $fp['align'] != '' ) {
			$s = "<div class=\"float{$fp['align']}\">{$s}</div>";
		}
		return str_replace( "\n", ' ', $prefix . $s . $postfix );
	}

	/**
	 * See makeImageLink()
	 * When this function is removed, remove if( $parser instanceof Parser ) check there too
	 * @deprecated since 1.20
	 */
	public static function makeImageLink2( Title $title, $file, $frameParams = array(),
		$handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
		return self::makeImageLink( null, $title, $file, $frameParams,
			$handlerParams, $time, $query, $widthOption );
	}

	/**
	 * Get the link parameters for MediaTransformOutput::toHtml() from given
	 * frame parameters supplied by the Parser.
	 * @param array $frameParams The frame parameters
	 * @param string $query An optional query string to add to description page links
	 * @param Parser|null $parser
	 * @return array
	 */
	private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
		$mtoParams = array();
		if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
			$mtoParams['custom-url-link'] = $frameParams['link-url'];
			if ( isset( $frameParams['link-target'] ) ) {
				$mtoParams['custom-target-link'] = $frameParams['link-target'];
			}
			if ( $parser ) {
				$extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
				foreach ( $extLinkAttrs as $name => $val ) {
					// Currently could include 'rel' and 'target'
					$mtoParams['parser-extlink-' . $name] = $val;
				}
			}
		} elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
			$mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
		} elseif ( !empty( $frameParams['no-link'] ) ) {
			// No link
		} else {
			$mtoParams['desc-link'] = true;
			$mtoParams['desc-query'] = $query;
		}
		return $mtoParams;
	}

	/**
	 * Make HTML for a thumbnail including image, border and caption
	 * @param Title $title
	 * @param File|bool $file File object or false if it doesn't exist
	 * @param string $label
	 * @param string $alt
	 * @param string $align
	 * @param array $params
	 * @param bool $framed
	 * @param string $manualthumb
	 * @return string
	 */
	public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
		$align = 'right', $params = array(), $framed = false, $manualthumb = ""
	) {
		$frameParams = array(
			'alt' => $alt,
			'caption' => $label,
			'align' => $align
		);
		if ( $framed ) {
			$frameParams['framed'] = true;
		}
		if ( $manualthumb ) {
			$frameParams['manualthumb'] = $manualthumb;
		}
		return self::makeThumbLink2( $title, $file, $frameParams, $params );
	}

	/**
	 * @param Title $title
	 * @param File $file
	 * @param array $frameParams
	 * @param array $handlerParams
	 * @param bool $time
	 * @param string $query
	 * @return string
	 */
	public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
		$handlerParams = array(), $time = false, $query = ""
	) {
		$exists = $file && $file->exists();

		# Shortcuts
		$fp =& $frameParams;
		$hp =& $handlerParams;

		$page = isset( $hp['page'] ) ? $hp['page'] : false;
		if ( !isset( $fp['align'] ) ) {
			$fp['align'] = 'right';
		}
		if ( !isset( $fp['alt'] ) ) {
			$fp['alt'] = '';
		}
		if ( !isset( $fp['title'] ) ) {
			$fp['title'] = '';
		}
		if ( !isset( $fp['caption'] ) ) {
			$fp['caption'] = '';
		}

		if ( empty( $hp['width'] ) ) {
			// Reduce width for upright images when parameter 'upright' is used
			$hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
		}
		$thumb = false;
		$noscale = false;
		$manualthumb = false;

		if ( !$exists ) {
			$outerWidth = $hp['width'] + 2;
		} else {
			if ( isset( $fp['manualthumb'] ) ) {
				# Use manually specified thumbnail
				$manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
				if ( $manual_title ) {
					$manual_img = wfFindFile( $manual_title );
					if ( $manual_img ) {
						$thumb = $manual_img->getUnscaledThumb( $hp );
						$manualthumb = true;
					} else {
						$exists = false;
					}
				}
			} elseif ( isset( $fp['framed'] ) ) {
				// Use image dimensions, don't scale
				$thumb = $file->getUnscaledThumb( $hp );
				$noscale = true;
			} else {
				# Do not present an image bigger than the source, for bitmap-style images
				# This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
				$srcWidth = $file->getWidth( $page );
				if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
					$hp['width'] = $srcWidth;
				}
				$thumb = $file->transform( $hp );
			}

			if ( $thumb ) {
				$outerWidth = $thumb->getWidth() + 2;
			} else {
				$outerWidth = $hp['width'] + 2;
			}
		}

		# ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
		# So we don't need to pass it here in $query. However, the URL for the
		# zoom icon still needs it, so we make a unique query for it. See bug 14771
		$url = $title->getLocalURL( $query );
		if ( $page ) {
			$url = wfAppendQuery( $url, array( 'page' => $page ) );
		}
		if ( $manualthumb
			&& !isset( $fp['link-title'] )
			&& !isset( $fp['link-url'] )
			&& !isset( $fp['no-link'] ) ) {
			$fp['link-url'] = $url;
		}

		$s = "<div class=\"thumb t{$fp['align']}\">"
			. "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";

		if ( !$exists ) {
			$s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
			$zoomIcon = '';
		} elseif ( !$thumb ) {
			$s .= wfMessage( 'thumbnail_error', '' )->escaped();
			$zoomIcon = '';
		} else {
			if ( !$noscale && !$manualthumb ) {
				self::processResponsiveImages( $file, $thumb, $hp );
			}
			$params = array(
				'alt' => $fp['alt'],
				'title' => $fp['title'],
				'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== ''
					? $fp['class'] . ' '
					: '' ) . 'thumbimage'
			);
			$params = self::getImageLinkMTOParams( $fp, $query ) + $params;
			$s .= $thumb->toHtml( $params );
			if ( isset( $fp['framed'] ) ) {
				$zoomIcon = "";
			} else {
				$zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
					Html::rawElement( 'a', array(
						'href' => $url,
						'class' => 'internal',
						'title' => wfMessage( 'thumbnail-more' )->text() ),
						"" ) );
			}
		}
		$s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
		return str_replace( "\n", ' ', $s );
	}

	/**
	 * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
	 * applicable.
	 *
	 * @param File $file
	 * @param MediaTransformOutput $thumb
	 * @param array $hp Image parameters
	 */
	public static function processResponsiveImages( $file, $thumb, $hp ) {
		global $wgResponsiveImages;
		if ( $wgResponsiveImages && $thumb && !$thumb->isError() ) {
			$hp15 = $hp;
			$hp15['width'] = round( $hp['width'] * 1.5 );
			$hp20 = $hp;
			$hp20['width'] = $hp['width'] * 2;
			if ( isset( $hp['height'] ) ) {
				$hp15['height'] = round( $hp['height'] * 1.5 );
				$hp20['height'] = $hp['height'] * 2;
			}

			$thumb15 = $file->transform( $hp15 );
			$thumb20 = $file->transform( $hp20 );
			if ( $thumb15 && !$thumb15->isError() && $thumb15->getUrl() !== $thumb->getUrl() ) {
				$thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
			}
			if ( $thumb20 && !$thumb20->isError() && $thumb20->getUrl() !== $thumb->getUrl() ) {
				$thumb->responsiveUrls['2'] = $thumb20->getUrl();
			}
		}
	}

	/**
	 * Make a "broken" link to an image
	 *
	 * @param Title $title
	 * @param string $label Link label (plain text)
	 * @param string $query Query string
	 * @param string $unused1 Unused parameter kept for b/c
	 * @param string $unused2 Unused parameter kept for b/c
	 * @param bool $time A file of a certain timestamp was requested
	 * @return string
	 */
	public static function makeBrokenImageLinkObj( $title, $label = '',
		$query = '', $unused1 = '', $unused2 = '', $time = false
	) {
		if ( !$title instanceof Title ) {
			wfWarn( __METHOD__ . ': Requires $title to be a Title object.' );
			return "<!-- ERROR -->" . htmlspecialchars( $label );
		}

		global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
		if ( $label == '' ) {
			$label = $title->getPrefixedText();
		}
		$encLabel = htmlspecialchars( $label );
		$currentExists = $time ? ( wfFindFile( $title ) != false ) : false;

		if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
			&& !$currentExists
		) {
			$redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );

			if ( $redir ) {
				return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
			}

			$href = self::getUploadUrl( $title, $query );

			return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
				htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
				$encLabel . '</a>';
		}

		return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
	}

	/**
	 * Get the URL to upload a certain file
	 *
	 * @param Title $destFile Title object of the file to upload
	 * @param string $query Urlencoded query string to prepend
	 * @return string Urlencoded URL
	 */
	protected static function getUploadUrl( $destFile, $query = '' ) {
		global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
		$q = 'wpDestFile=' . $destFile->getPartialURL();
		if ( $query != '' ) {
			$q .= '&' . $query;
		}

		if ( $wgUploadMissingFileUrl ) {
			return wfAppendQuery( $wgUploadMissingFileUrl, $q );
		} elseif ( $wgUploadNavigationUrl ) {
			return wfAppendQuery( $wgUploadNavigationUrl, $q );
		} else {
			$upload = SpecialPage::getTitleFor( 'Upload' );
			return $upload->getLocalURL( $q );
		}
	}

	/**
	 * Create a direct link to a given uploaded file.
	 *
	 * @param Title $title
	 * @param string $html Pre-sanitized HTML
	 * @param string $time MW timestamp of file creation time
	 * @return string HTML
	 */
	public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
		$img = wfFindFile( $title, array( 'time' => $time ) );
		return self::makeMediaLinkFile( $title, $img, $html );
	}

	/**
	 * Create a direct link to a given uploaded file.
	 * This will make a broken link if $file is false.
	 *
	 * @param Title $title
	 * @param File|bool $file File object or false
	 * @param string $html Pre-sanitized HTML
	 * @return string HTML
	 *
	 * @todo Handle invalid or missing images better.
	 */
	public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
		if ( $file && $file->exists() ) {
			$url = $file->getURL();
			$class = 'internal';
		} else {
			$url = self::getUploadUrl( $title );
			$class = 'new';
		}

		$alt = $title->getText();
		if ( $html == '' ) {
			$html = $alt;
		}

		$ret = '';
		$attribs = array(
			'href' => $url,
			'class' => $class,
			'title' => $alt
		);

		if ( !Hooks::run( 'LinkerMakeMediaLinkFile',
			array( $title, $file, &$html, &$attribs, &$ret ) ) ) {
			wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
				. "with url {$url} and text {$html} to {$ret}\n", true );
			return $ret;
		}

		return Html::rawElement( 'a', $attribs, $html );
	}

	/**
	 * Make a link to a special page given its name and, optionally,
	 * a message key from the link text.
	 * Usage example: Linker::specialLink( 'Recentchanges' )
	 *
	 * @param string $name
	 * @param string $key
	 * @return string
	 */
	public static function specialLink( $name, $key = '' ) {
		if ( $key == '' ) {
			$key = strtolower( $name );
		}

		return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
	}

	/**
	 * Make an external link
	 * @param string $url URL to link to
	 * @param string $text Text of link
	 * @param bool $escape Do we escape the link text?
	 * @param string $linktype Type of external link. Gets added to the classes
	 * @param array $attribs Array of extra attributes to <a>
	 * @param Title|null $title Title object used for title specific link attributes
	 * @return string
	 */
	public static function makeExternalLink( $url, $text, $escape = true,
		$linktype = '', $attribs = array(), $title = null
	) {
		global $wgTitle;
		$class = "external";
		if ( $linktype ) {
			$class .= " $linktype";
		}
		if ( isset( $attribs['class'] ) && $attribs['class'] ) {
			$class .= " {$attribs['class']}";
		}
		$attribs['class'] = $class;

		if ( $escape ) {
			$text = htmlspecialchars( $text );
		}

		if ( !$title ) {
			$title = $wgTitle;
		}
		$attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
		$link = '';
		$success = Hooks::run( 'LinkerMakeExternalLink',
			array( &$url, &$text, &$link, &$attribs, $linktype ) );
		if ( !$success ) {
			wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
				. "with url {$url} and text {$text} to {$link}\n", true );
			return $link;
		}
		$attribs['href'] = $url;
		return Html::rawElement( 'a', $attribs, $text );
	}

	/**
	 * Make user link (or user contributions for unregistered users)
	 * @param int $userId User id in database.
	 * @param string $userName User name in database.
	 * @param string $altUserName Text to display instead of the user name (optional)
	 * @return string HTML fragment
	 * @since 1.19 Method exists for a long time. $altUserName was added in 1.19.
	 */
	public static function userLink( $userId, $userName, $altUserName = false ) {
		$classes = 'mw-userlink';
		if ( $userId == 0 ) {
			$page = SpecialPage::getTitleFor( 'Contributions', $userName );
			if ( $altUserName === false ) {
				$altUserName = IP::prettifyIP( $userName );
			}
			$classes .= ' mw-anonuserlink'; // Separate link class for anons (bug 43179)
		} else {
			$page = Title::makeTitle( NS_USER, $userName );
		}

		return self::link(
			$page,
			htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
			array( 'class' => $classes )
		);
	}

	/**
	 * Generate standard user tool links (talk, contributions, block link, etc.)
	 *
	 * @param int $userId User identifier
	 * @param string $userText User name or IP address
	 * @param bool $redContribsWhenNoEdits Should the contributions link be
	 *   red if the user has no edits?
	 * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
	 *   and Linker::TOOL_LINKS_EMAIL).
	 * @param int $edits User edit count (optional, for performance)
	 * @return string HTML fragment
	 */
	public static function userToolLinks(
		$userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
	) {
		global $wgUser, $wgDisableAnonTalk, $wgLang;
		$talkable = !( $wgDisableAnonTalk && 0 == $userId );
		$blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
		$addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;

		$items = array();
		if ( $talkable ) {
			$items[] = self::userTalkLink( $userId, $userText );
		}
		if ( $userId ) {
			// check if the user has an edit
			$attribs = array();
			if ( $redContribsWhenNoEdits ) {
				if ( intval( $edits ) === 0 && $edits !== 0 ) {
					$user = User::newFromId( $userId );
					$edits = $user->getEditCount();
				}
				if ( $edits === 0 ) {
					$attribs['class'] = 'new';
				}
			}
			$contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );

			$items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
		}
		if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
			$items[] = self::blockLink( $userId, $userText );
		}

		if ( $addEmailLink && $wgUser->canSendEmail() ) {
			$items[] = self::emailLink( $userId, $userText );
		}

		Hooks::run( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );

		if ( $items ) {
			return wfMessage( 'word-separator' )->escaped()
				. '<span class="mw-usertoollinks">'
				. wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
				. '</span>';
		} else {
			return '';
		}
	}

	/**
	 * Alias for userToolLinks( $userId, $userText, true );
	 * @param int $userId User identifier
	 * @param string $userText User name or IP address
	 * @param int $edits User edit count (optional, for performance)
	 * @return string
	 */
	public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
		return self::userToolLinks( $userId, $userText, true, 0, $edits );
	}

	/**
	 * @param int $userId User id in database.
	 * @param string $userText User name in database.
	 * @return string HTML fragment with user talk link
	 */
	public static function userTalkLink( $userId, $userText ) {
		$userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
		$userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
		return $userTalkLink;
	}

	/**
	 * @param int $userId Userid
	 * @param string $userText User name in database.
	 * @return string HTML fragment with block link
	 */
	public static function blockLink( $userId, $userText ) {
		$blockPage = SpecialPage::getTitleFor( 'Block', $userText );
		$blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
		return $blockLink;
	}

	/**
	 * @param int $userId Userid
	 * @param string $userText User name in database.
	 * @return string HTML fragment with e-mail user link
	 */
	public static function emailLink( $userId, $userText ) {
		$emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
		$emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
		return $emailLink;
	}

	/**
	 * Generate a user link if the current user is allowed to view it
	 * @param Revision $rev
	 * @param bool $isPublic Show only if all users can see it
	 * @return string HTML fragment
	 */
	public static function revUserLink( $rev, $isPublic = false ) {
		if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
			$link = wfMessage( 'rev-deleted-user' )->escaped();
		} elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
			$link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
				$rev->getUserText( Revision::FOR_THIS_USER ) );
		} else {
			$link = wfMessage( 'rev-deleted-user' )->escaped();
		}
		if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
			return '<span class="history-deleted">' . $link . '</span>';
		}
		return $link;
	}

	/**
	 * Generate a user tool link cluster if the current user is allowed to view it
	 * @param Revision $rev
	 * @param bool $isPublic Show only if all users can see it
	 * @return string HTML
	 */
	public static function revUserTools( $rev, $isPublic = false ) {
		if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
			$link = wfMessage( 'rev-deleted-user' )->escaped();
		} elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
			$userId = $rev->getUser( Revision::FOR_THIS_USER );
			$userText = $rev->getUserText( Revision::FOR_THIS_USER );
			$link = self::userLink( $userId, $userText )
				. self::userToolLinks( $userId, $userText );
		} else {
			$link = wfMessage( 'rev-deleted-user' )->escaped();
		}
		if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
			return ' <span class="history-deleted">' . $link . '</span>';
		}
		return $link;
	}

	/**
	 * This function is called by all recent changes variants, by the page history,
	 * and by the user contributions list. It is responsible for formatting edit
	 * summaries. It escapes any HTML in the summary, but adds some CSS to format
	 * auto-generated comments (from section editing) and formats [[wikilinks]].
	 *
	 * @author Erik Moeller <moeller@scireview.de>
	 *
	 * Note: there's not always a title to pass to this function.
	 * Since you can't set a default parameter for a reference, I've turned it
	 * temporarily to a value pass. Should be adjusted further. --brion
	 *
	 * @param string $comment
	 * @param Title|null $title Title object (to generate link to the section in autocomment) or null
	 * @param bool $local Whether section links should refer to local page
	 * @return mixed|string
	 */
	public static function formatComment( $comment, $title = null, $local = false ) {

		# Sanitize text a bit:
		$comment = str_replace( "\n", " ", $comment );
		# Allow HTML entities (for bug 13815)
		$comment = Sanitizer::escapeHtmlAllowEntities( $comment );

		# Render autocomments and make links:
		$comment = self::formatAutocomments( $comment, $title, $local );
		$comment = self::formatLinksInComment( $comment, $title, $local );

		return $comment;
	}

	/**
	 * Converts autogenerated comments in edit summaries into section links.
	 *
	 * The pattern for autogen comments is / * foo * /, which makes for
	 * some nasty regex.
	 * We look for all comments, match any text before and after the comment,
	 * add a separator where needed and format the comment itself with CSS
	 * Called by Linker::formatComment.
	 *
	 * @param string $comment Comment text
	 * @param Title|null $title An optional title object used to links to sections
	 * @param bool $local Whether section links should refer to local page
	 * @return string Formatted comment
	 */
	private static function formatAutocomments( $comment, $title = null, $local = false ) {
		// @todo $append here is something of a hack to preserve the status
		// quo. Someone who knows more about bidi and such should decide
		// (1) what sane rendering even *is* for an LTR edit summary on an RTL
		// wiki, both when autocomments exist and when they don't, and
		// (2) what markup will make that actually happen.
		$append = '';
		$comment = preg_replace_callback(
			// To detect the presence of content before or after the
			// auto-comment, we use capturing groups inside optional zero-width
			// assertions. But older versions of PCRE can't directly make
			// zero-width assertions optional, so wrap them in a non-capturing
			// group.
			'!(?:(?<=(.)))?/\*\s*(.*?)\s*\*/(?:(?=(.)))?!',
			function ( $match ) use ( $title, $local, &$append ) {
				global $wgLang;

				// Ensure all match positions are defined
				$match += array( '', '', '', '' );

				$pre = $match[1] !== '';
				$auto = $match[2];
				$post = $match[3] !== '';
				$comment = null;
				Hooks::run( 'FormatAutocomments', array( &$comment, $pre, $auto, $post, $title, $local ) );
				if ( $comment === null ) {
					$link = '';
					if ( $title ) {
						$section = $auto;
						# Remove links that a user may have manually put in the autosummary
						# This could be improved by copying as much of Parser::stripSectionName as desired.
						$section = str_replace( '[[:', '', $section );
						$section = str_replace( '[[', '', $section );
						$section = str_replace( ']]', '', $section );

						$section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
						if ( $local ) {
							$sectionTitle = Title::newFromText( '#' . $section );
						} else {
							$sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
								$title->getDBkey(), $section );
						}
						if ( $sectionTitle ) {
							$link = Linker::link( $sectionTitle,
								$wgLang->getArrow(), array(), array(),
								'noclasses' );
						} else {
							$link = '';
						}
					}
					if ( $pre ) {
						# written summary $presep autocomment (summary /* section */)
						$pre = wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
					}
					if ( $post ) {
						# autocomment $postsep written summary (/* section */ summary)
						$auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
					}
					$auto = '<span class="autocomment">' . $auto . '</span>';
					$comment = $pre . $link . $wgLang->getDirMark()
						. '<span dir="auto">' . $auto;
					$append .= '</span>';
				}
				return $comment;
			},
			$comment
		);
		return $comment . $append;
	}

	/**
	 * Formats wiki links and media links in text; all other wiki formatting
	 * is ignored
	 *
	 * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
	 * @param string $comment Text to format links in
	 * @param Title|null $title An optional title object used to links to sections
	 * @param bool $local Whether section links should refer to local page
	 * @param string|null $wikiId Id of the wiki to link to (if not the local wiki), as used by WikiMap
	 *
	 * @return string
	 */
	public static function formatLinksInComment(
		$comment, $title = null, $local = false, $wikiId = null
	) {
		return preg_replace_callback(
			'/
				\[\[
				:? # ignore optional leading colon
				([^\]|]+) # 1. link target; page names cannot include ] or |
				(?:\|
					# 2. a pipe-separated substring; only the last is captured
					# Stop matching at | and ]] without relying on backtracking.
					((?:]?[^\]|])*+)
				)*
				\]\]
				([^[]*) # 3. link trail (the text up until the next link)
			/x',
			function ( $match ) use ( $title, $local, $wikiId ) {
				global $wgContLang;

				$medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
				$medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';

				$comment = $match[0];

				# fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
				if ( strpos( $match[1], '%' ) !== false ) {
					$match[1] = str_replace(
						array( '<', '>' ),
						array( '&lt;', '&gt;' ),
						rawurldecode( $match[1] )
					);
				}

				# Handle link renaming [[foo|text]] will show link as "text"
				if ( $match[2] != "" ) {
					$text = $match[2];
				} else {
					$text = $match[1];
				}
				$submatch = array();
				$thelink = null;
				if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
					# Media link; trail not supported.
					$linkRegexp = '/\[\[(.*?)\]\]/';
					$title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
					if ( $title ) {
						$thelink = Linker::makeMediaLinkObj( $title, $text );
					}
				} else {
					# Other kind of link
					if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
						$trail = $submatch[1];
					} else {
						$trail = "";
					}
					$linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
					if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
						$match[1] = substr( $match[1], 1 );
					}
					list( $inside, $trail ) = Linker::splitTrail( $trail );

					$linkText = $text;
					$linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );

					$target = Title::newFromText( $linkTarget );
					if ( $target ) {
						if ( $target->getText() == '' && !$target->isExternal()
							&& !$local && $title
						) {
							$newTarget = clone ( $title );
							$newTarget->setFragment( '#' . $target->getFragment() );
							$target = $newTarget;

						}

						if ( $wikiId !== null ) {
							$thelink = Linker::makeExternalLink(
								WikiMap::getForeignURL( $wikiId, $target->getFullText() ),
								$linkText . $inside,
								/* escape = */ false // Already escaped
							) . $trail;
						} else {
							$thelink = Linker::link(
								$target,
								$linkText . $inside
							) . $trail;
						}

					}
				}
				if ( $thelink ) {
					// If the link is still valid, go ahead and replace it in!
					$comment = preg_replace(
						$linkRegexp,
						StringUtils::escapeRegexReplacement( $thelink ),
						$comment,
						1
					);
				}

				return $comment;
			},
			$comment
		);
	}

	/**
	 * @param Title $contextTitle
	 * @param string $target
	 * @param string $text
	 * @return string
	 */
	public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
		# Valid link forms:
		# Foobar -- normal
		# :Foobar -- override special treatment of prefix (images, language links)
		# /Foobar -- convert to CurrentPage/Foobar
		# /Foobar/ -- convert to CurrentPage/Foobar, strip the initial and final / from text
		# ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
		# ../Foobar -- convert to CurrentPage/Foobar,
		#              (from CurrentPage/CurrentSubPage)
		# ../Foobar/ -- convert to CurrentPage/Foobar, use 'Foobar' as text
		#              (from CurrentPage/CurrentSubPage)

		$ret = $target; # default return value is no change

		# Some namespaces don't allow subpages,
		# so only perform processing if subpages are allowed
		if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
			$hash = strpos( $target, '#' );
			if ( $hash !== false ) {
				$suffix = substr( $target, $hash );
				$target = substr( $target, 0, $hash );
			} else {
				$suffix = '';
			}
			# bug 7425
			$target = trim( $target );
			# Look at the first character
			if ( $target != '' && $target[0] === '/' ) {
				# / at end means we don't want the slash to be shown
				$m = array();
				$trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
				if ( $trailingSlashes ) {
					$noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
				} else {
					$noslash = substr( $target, 1 );
				}

				$ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
				if ( $text === '' ) {
					$text = $target . $suffix;
				} # this might be changed for ugliness reasons
			} else {
				# check for .. subpage backlinks
				$dotdotcount = 0;
				$nodotdot = $target;
				while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
					++$dotdotcount;
					$nodotdot = substr( $nodotdot, 3 );
				}
				if ( $dotdotcount > 0 ) {
					$exploded = explode( '/', $contextTitle->getPrefixedText() );
					if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
						$ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
						# / at the end means don't show full path
						if ( substr( $nodotdot, -1, 1 ) === '/' ) {
							$nodotdot = rtrim( $nodotdot, '/' );
							if ( $text === '' ) {
								$text = $nodotdot . $suffix;
							}
						}
						$nodotdot = trim( $nodotdot );
						if ( $nodotdot != '' ) {
							$ret .= '/' . $nodotdot;
						}
						$ret .= $suffix;
					}
				}
			}
		}

		return $ret;
	}

	/**
	 * Wrap a comment in standard punctuation and formatting if
	 * it's non-empty, otherwise return empty string.
	 *
	 * @param string $comment
	 * @param Title|null $title Title object (to generate link to section in autocomment) or null
	 * @param bool $local Whether section links should refer to local page
	 *
	 * @return string
	 */
	public static function commentBlock( $comment, $title = null, $local = false ) {
		// '*' used to be the comment inserted by the software way back
		// in antiquity in case none was provided, here for backwards
		// compatibility, acc. to brion -ævar
		if ( $comment == '' || $comment == '*' ) {
			return '';
		} else {
			$formatted = self::formatComment( $comment, $title, $local );
			$formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
			return " <span class=\"comment\">$formatted</span>";
		}
	}

	/**
	 * Wrap and format the given revision's comment block, if the current
	 * user is allowed to view it.
	 *
	 * @param Revision $rev
	 * @param bool $local Whether section links should refer to local page
	 * @param bool $isPublic Show only if all users can see it
	 * @return string HTML fragment
	 */
	public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
		if ( $rev->getComment( Revision::RAW ) == "" ) {
			return "";
		}
		if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
			$block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
		} elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
			$block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
				$rev->getTitle(), $local );
		} else {
			$block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
		}
		if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
			return " <span class=\"history-deleted\">$block</span>";
		}
		return $block;
	}

	/**
	 * @param int $size
	 * @return string
	 */
	public static function formatRevisionSize( $size ) {
		if ( $size == 0 ) {
			$stxt = wfMessage( 'historyempty' )->escaped();
		} else {
			$stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
			$stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
		}
		return "<span class=\"history-size\">$stxt</span>";
	}

	/**
	 * Add another level to the Table of Contents
	 *
	 * @return string
	 */
	public static function tocIndent() {
		return "\n<ul>";
	}

	/**
	 * Finish one or more sublevels on the Table of Contents
	 *
	 * @param int $level
	 * @return string
	 */
	public static function tocUnindent( $level ) {
		return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
	}

	/**
	 * parameter level defines if we are on an indentation level
	 *
	 * @param string $anchor
	 * @param string $tocline
	 * @param string $tocnumber
	 * @param string $level
	 * @param string|bool $sectionIndex
	 * @return string
	 */
	public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
		$classes = "toclevel-$level";
		if ( $sectionIndex !== false ) {
			$classes .= " tocsection-$sectionIndex";
		}
		return "\n<li class=\"$classes\"><a href=\"#" .
			$anchor . '"><span class="tocnumber">' .
			$tocnumber . '</span> <span class="toctext">' .
			$tocline . '</span></a>';
	}

	/**
	 * End a Table Of Contents line.
	 * tocUnindent() will be used instead if we're ending a line below
	 * the new level.
	 * @return string
	 */
	public static function tocLineEnd() {
		return "</li>\n";
	}

	/**
	 * Wraps the TOC in a table and provides the hide/collapse javascript.
	 *
	 * @param string $toc Html of the Table Of Contents
	 * @param string|Language|bool $lang Language for the toc title, defaults to user language
	 * @return string Full html of the TOC
	 */
	public static function tocList( $toc, $lang = false ) {
		$lang = wfGetLangObj( $lang );
		$title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();

		return '<div id="toc" class="toc">'
			. '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
			. $toc
			. "</ul>\n</div>\n";
	}

	/**
	 * Generate a table of contents from a section tree
	 * Currently unused.
	 *
	 * @param array $tree Return value of ParserOutput::getSections()
	 * @return string HTML fragment
	 */
	public static function generateTOC( $tree ) {
		$toc = '';
		$lastLevel = 0;
		foreach ( $tree as $section ) {
			if ( $section['toclevel'] > $lastLevel ) {
				$toc .= self::tocIndent();
			} elseif ( $section['toclevel'] < $lastLevel ) {
				$toc .= self::tocUnindent(
					$lastLevel - $section['toclevel'] );
			} else {
				$toc .= self::tocLineEnd();
			}

			$toc .= self::tocLine( $section['anchor'],
				$section['line'], $section['number'],
				$section['toclevel'], $section['index'] );
			$lastLevel = $section['toclevel'];
		}
		$toc .= self::tocLineEnd();
		return self::tocList( $toc );
	}

	/**
	 * Create a headline for content
	 *
	 * @param int $level The level of the headline (1-6)
	 * @param string $attribs Any attributes for the headline, starting with
	 *   a space and ending with '>'
	 *   This *must* be at least '>' for no attribs
	 * @param string $anchor The anchor to give the headline (the bit after the #)
	 * @param string $html Html for the text of the header
	 * @param string $link HTML to add for the section edit link
	 * @param bool|string $legacyAnchor A second, optional anchor to give for
	 *   backward compatibility (false to omit)
	 *
	 * @return string HTML headline
	 */
	public static function makeHeadline( $level, $attribs, $anchor, $html,
		$link, $legacyAnchor = false
	) {
		$ret = "<h$level$attribs"
			. "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
			. $link
			. "</h$level>";
		if ( $legacyAnchor !== false ) {
			$ret = "<div id=\"$legacyAnchor\"></div>$ret";
		}
		return $ret;
	}

	/**
	 * Split a link trail, return the "inside" portion and the remainder of the trail
	 * as a two-element array
	 * @param string $trail
	 * @return array
	 */
	static function splitTrail( $trail ) {
		global $wgContLang;
		$regex = $wgContLang->linkTrail();
		$inside = '';
		if ( $trail !== '' ) {
			$m = array();
			if ( preg_match( $regex, $trail, $m ) ) {
				$inside = $m[1];
				$trail = $m[2];
			}
		}
		return array( $inside, $trail );
	}

	/**
	 * Generate a rollback link for a given revision.  Currently it's the
	 * caller's responsibility to ensure that the revision is the top one. If
	 * it's not, of course, the user will get an error message.
	 *
	 * If the calling page is called with the parameter &bot=1, all rollback
	 * links also get that parameter. It causes the edit itself and the rollback
	 * to be marked as "bot" edits. Bot edits are hidden by default from recent
	 * changes, so this allows sysops to combat a busy vandal without bothering
	 * other users.
	 *
	 * If the option verify is set this function will return the link only in case the
	 * revision can be reverted. Please note that due to performance limitations
	 * it might be assumed that a user isn't the only contributor of a page while
	 * (s)he is, which will lead to useless rollback links. Furthermore this wont
	 * work if $wgShowRollbackEditCount is disabled, so this can only function
	 * as an additional check.
	 *
	 * If the option noBrackets is set the rollback link wont be enclosed in []
	 *
	 * @param Revision $rev
	 * @param IContextSource $context Context to use or null for the main context.
	 * @param array $options
	 * @return string
	 */
	public static function generateRollback( $rev, IContextSource $context = null,
		$options = array( 'verify' )
	) {
		if ( $context === null ) {
			$context = RequestContext::getMain();
		}

		$editCount = false;
		if ( in_array( 'verify', $options ) ) {
			$editCount = self::getRollbackEditCount( $rev, true );
			if ( $editCount === false ) {
				return '';
			}
		}

		$inner = self::buildRollbackLink( $rev, $context, $editCount );

		if ( !in_array( 'noBrackets', $options ) ) {
			$inner = $context->msg( 'brackets' )->rawParams( $inner )->escaped();
		}

		return '<span class="mw-rollback-link">' . $inner . '</span>';
	}

	/**
	 * This function will return the number of revisions which a rollback
	 * would revert and, if $verify is set it will verify that a revision
	 * can be reverted (that the user isn't the only contributor and the
	 * revision we might rollback to isn't deleted). These checks can only
	 * function as an additional check as this function only checks against
	 * the last $wgShowRollbackEditCount edits.
	 *
	 * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
	 * is set and the user is the only contributor of the page.
	 *
	 * @param Revision $rev
	 * @param bool $verify Try to verify that this revision can really be rolled back
	 * @return int|bool|null
	 */
	public static function getRollbackEditCount( $rev, $verify ) {
		global $wgShowRollbackEditCount;
		if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
			// Nothing has happened, indicate this by returning 'null'
			return null;
		}

		$dbr = wfGetDB( DB_SLAVE );

		// Up to the value of $wgShowRollbackEditCount revisions are counted
		$res = $dbr->select(
			'revision',
			array( 'rev_user_text', 'rev_deleted' ),
			// $rev->getPage() returns null sometimes
			array( 'rev_page' => $rev->getTitle()->getArticleID() ),
			__METHOD__,
			array(
				'USE INDEX' => array( 'revision' => 'page_timestamp' ),
				'ORDER BY' => 'rev_timestamp DESC',
				'LIMIT' => $wgShowRollbackEditCount + 1
			)
		);

		$editCount = 0;
		$moreRevs = false;
		foreach ( $res as $row ) {
			if ( $rev->getUserText( Revision::RAW ) != $row->rev_user_text ) {
				if ( $verify &&
					( $row->rev_deleted & Revision::DELETED_TEXT
						|| $row->rev_deleted & Revision::DELETED_USER
				) ) {
					// If the user or the text of the revision we might rollback
					// to is deleted in some way we can't rollback. Similar to
					// the sanity checks in WikiPage::commitRollback.
					return false;
				}
				$moreRevs = true;
				break;
			}
			$editCount++;
		}

		if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
			// We didn't find at least $wgShowRollbackEditCount revisions made by the current user
			// and there weren't any other revisions. That means that the current user is the only
			// editor, so we can't rollback
			return false;
		}
		return $editCount;
	}

	/**
	 * Build a raw rollback link, useful for collections of "tool" links
	 *
	 * @param Revision $rev
	 * @param IContextSource|null $context Context to use or null for the main context.
	 * @param int $editCount Number of edits that would be reverted
	 * @return string HTML fragment
	 */
	public static function buildRollbackLink( $rev, IContextSource $context = null,
		$editCount = false
	) {
		global $wgShowRollbackEditCount, $wgMiserMode;

		// To config which pages are affected by miser mode
		$disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );

		if ( $context === null ) {
			$context = RequestContext::getMain();
		}

		$title = $rev->getTitle();
		$query = array(
			'action' => 'rollback',
			'from' => $rev->getUserText(),
			'token' => $context->getUser()->getEditToken( array(
				$title->getPrefixedText(),
				$rev->getUserText()
			) ),
		);
		if ( $context->getRequest()->getBool( 'bot' ) ) {
			$query['bot'] = '1';
			$query['hidediff'] = '1'; // bug 15999
		}

		$disableRollbackEditCount = false;
		if ( $wgMiserMode ) {
			foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
				if ( $context->getTitle()->isSpecial( $specialPage ) ) {
					$disableRollbackEditCount = true;
					break;
				}
			}
		}

		if ( !$disableRollbackEditCount
			&& is_int( $wgShowRollbackEditCount )
			&& $wgShowRollbackEditCount > 0
		) {
			if ( !is_numeric( $editCount ) ) {
				$editCount = self::getRollbackEditCount( $rev, false );
			}

			if ( $editCount > $wgShowRollbackEditCount ) {
				$editCount_output = $context->msg( 'rollbacklinkcount-morethan' )
					->numParams( $wgShowRollbackEditCount )->parse();
			} else {
				$editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
			}

			return self::link(
				$title,
				$editCount_output,
				array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
				$query,
				array( 'known', 'noclasses' )
			);
		} else {
			return self::link(
				$title,
				$context->msg( 'rollbacklink' )->escaped(),
				array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
				$query,
				array( 'known', 'noclasses' )
			);
		}
	}

	/**
	 * Returns HTML for the "templates used on this page" list.
	 *
	 * Make an HTML list of templates, and then add a "More..." link at
	 * the bottom. If $more is null, do not add a "More..." link. If $more
	 * is a Title, make a link to that title and use it. If $more is a string,
	 * directly paste it in as the link (escaping needs to be done manually).
	 * Finally, if $more is a Message, call toString().
	 *
	 * @param array $templates Array of templates from Article::getUsedTemplate or similar
	 * @param bool $preview Whether this is for a preview
	 * @param bool $section Whether this is for a section edit
	 * @param Title|Message|string|null $more An escaped link for "More..." of the templates
	 * @return string HTML output
	 */
	public static function formatTemplates( $templates, $preview = false,
		$section = false, $more = null
	) {
		global $wgLang;

		$outText = '';
		if ( count( $templates ) > 0 ) {
			# Do a batch existence check
			$batch = new LinkBatch;
			foreach ( $templates as $title ) {
				$batch->addObj( $title );
			}
			$batch->execute();

			# Construct the HTML
			$outText = '<div class="mw-templatesUsedExplanation">';
			if ( $preview ) {
				$outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
					->parseAsBlock();
			} elseif ( $section ) {
				$outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
					->parseAsBlock();
			} else {
				$outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
					->parseAsBlock();
			}
			$outText .= "</div><ul>\n";

			usort( $templates, 'Title::compare' );
			foreach ( $templates as $titleObj ) {
				$protected = '';
				$restrictions = $titleObj->getRestrictions( 'edit' );
				if ( $restrictions ) {
					// Check backwards-compatible messages
					$msg = null;
					if ( $restrictions === array( 'sysop' ) ) {
						$msg = wfMessage( 'template-protected' );
					} elseif ( $restrictions === array( 'autoconfirmed' ) ) {
						$msg = wfMessage( 'template-semiprotected' );
					}
					if ( $msg && !$msg->isDisabled() ) {
						$protected = $msg->parse();
					} else {
						// Construct the message from restriction-level-*
						// e.g. restriction-level-sysop, restriction-level-autoconfirmed
						$msgs = array();
						foreach ( $restrictions as $r ) {
							$msgs[] = wfMessage( "restriction-level-$r" )->parse();
						}
						$protected = wfMessage( 'parentheses' )
							->rawParams( $wgLang->commaList( $msgs ) )->escaped();
					}
				}
				if ( $titleObj->quickUserCan( 'edit' ) ) {
					$editLink = self::link(
						$titleObj,
						wfMessage( 'editlink' )->escaped(),
						array(),
						array( 'action' => 'edit' )
					);
				} else {
					$editLink = self::link(
						$titleObj,
						wfMessage( 'viewsourcelink' )->escaped(),
						array(),
						array( 'action' => 'edit' )
					);
				}
				$outText .= '<li>' . self::link( $titleObj )
					. wfMessage( 'word-separator' )->escaped()
					. wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
					. wfMessage( 'word-separator' )->escaped()
					. $protected . '</li>';
			}

			if ( $more instanceof Title ) {
				$outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
			} elseif ( $more ) {
				$outText .= "<li>$more</li>";
			}

			$outText .= '</ul>';
		}
		return $outText;
	}

	/**
	 * Returns HTML for the "hidden categories on this page" list.
	 *
	 * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
	 *   or similar
	 * @return string HTML output
	 */
	public static function formatHiddenCategories( $hiddencats ) {

		$outText = '';
		if ( count( $hiddencats ) > 0 ) {
			# Construct the HTML
			$outText = '<div class="mw-hiddenCategoriesExplanation">';
			$outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
			$outText .= "</div><ul>\n";

			foreach ( $hiddencats as $titleObj ) {
				# If it's hidden, it must exist - no need to check with a LinkBatch
				$outText .= '<li>'
					. self::link( $titleObj, null, array(), array(), 'known' )
					. "</li>\n";
			}
			$outText .= '</ul>';
		}
		return $outText;
	}

	/**
	 * Format a size in bytes for output, using an appropriate
	 * unit (B, KB, MB or GB) according to the magnitude in question
	 *
	 * @param int $size Size to format
	 * @return string
	 */
	public static function formatSize( $size ) {
		global $wgLang;
		return htmlspecialchars( $wgLang->formatSize( $size ) );
	}

	/**
	 * Given the id of an interface element, constructs the appropriate title
	 * attribute from the system messages.  (Note, this is usually the id but
	 * isn't always, because sometimes the accesskey needs to go on a different
	 * element than the id, for reverse-compatibility, etc.)
	 *
	 * @param string $name Id of the element, minus prefixes.
	 * @param string|null $options Null or the string 'withaccess' to add an access-
	 *   key hint
	 * @return string Contents of the title attribute (which you must HTML-
	 *   escape), or false for no title attribute
	 */
	public static function titleAttrib( $name, $options = null ) {

		$message = wfMessage( "tooltip-$name" );

		if ( !$message->exists() ) {
			$tooltip = false;
		} else {
			$tooltip = $message->text();
			# Compatibility: formerly some tooltips had [alt-.] hardcoded
			$tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
			# Message equal to '-' means suppress it.
			if ( $tooltip == '-' ) {
				$tooltip = false;
			}
		}

		if ( $options == 'withaccess' ) {
			$accesskey = self::accesskey( $name );
			if ( $accesskey !== false ) {
				// Should be build the same as in jquery.accessKeyLabel.js
				if ( $tooltip === false || $tooltip === '' ) {
					$tooltip = wfMessage( 'brackets', $accesskey )->text();
				} else {
					$tooltip .= wfMessage( 'word-separator' )->text();
					$tooltip .= wfMessage( 'brackets', $accesskey )->text();
				}
			}
		}

		return $tooltip;
	}

	public static $accesskeycache;

	/**
	 * Given the id of an interface element, constructs the appropriate
	 * accesskey attribute from the system messages.  (Note, this is usually
	 * the id but isn't always, because sometimes the accesskey needs to go on
	 * a different element than the id, for reverse-compatibility, etc.)
	 *
	 * @param string $name Id of the element, minus prefixes.
	 * @return string Contents of the accesskey attribute (which you must HTML-
	 *   escape), or false for no accesskey attribute
	 */
	public static function accesskey( $name ) {
		if ( isset( self::$accesskeycache[$name] ) ) {
			return self::$accesskeycache[$name];
		}

		$message = wfMessage( "accesskey-$name" );

		if ( !$message->exists() ) {
			$accesskey = false;
		} else {
			$accesskey = $message->plain();
			if ( $accesskey === '' || $accesskey === '-' ) {
				# @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
				# attribute, but this is broken for accesskey: that might be a useful
				# value.
				$accesskey = false;
			}
		}

		self::$accesskeycache[$name] = $accesskey;
		return self::$accesskeycache[$name];
	}

	/**
	 * Get a revision-deletion link, or disabled link, or nothing, depending
	 * on user permissions & the settings on the revision.
	 *
	 * Will use forward-compatible revision ID in the Special:RevDelete link
	 * if possible, otherwise the timestamp-based ID which may break after
	 * undeletion.
	 *
	 * @param User $user
	 * @param Revision $rev
	 * @param Title $title
	 * @return string HTML fragment
	 */
	public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
		$canHide = $user->isAllowed( 'deleterevision' );
		if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
			return '';
		}

		if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
			return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
		} else {
			if ( $rev->getId() ) {
				// RevDelete links using revision ID are stable across
				// page deletion and undeletion; use when possible.
				$query = array(
					'type' => 'revision',
					'target' => $title->getPrefixedDBkey(),
					'ids' => $rev->getId()
				);
			} else {
				// Older deleted entries didn't save a revision ID.
				// We have to refer to these by timestamp, ick!
				$query = array(
					'type' => 'archive',
					'target' => $title->getPrefixedDBkey(),
					'ids' => $rev->getTimestamp()
				);
			}
			return Linker::revDeleteLink( $query,
				$rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
		}
	}

	/**
	 * Creates a (show/hide) link for deleting revisions/log entries
	 *
	 * @param array $query Query parameters to be passed to link()
	 * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
	 * @param bool $delete Set to true to use (show/hide) rather than (show)
	 *
	 * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
	 * span to allow for customization of appearance with CSS
	 */
	public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
		$sp = SpecialPage::getTitleFor( 'Revisiondelete' );
		$msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
		$html = wfMessage( $msgKey )->escaped();
		$tag = $restricted ? 'strong' : 'span';
		$link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
		return Xml::tags(
			$tag,
			array( 'class' => 'mw-revdelundel-link' ),
			wfMessage( 'parentheses' )->rawParams( $link )->escaped()
		);
	}

	/**
	 * Creates a dead (show/hide) link for deleting revisions/log entries
	 *
	 * @param bool $delete Set to true to use (show/hide) rather than (show)
	 *
	 * @return string HTML text wrapped in a span to allow for customization
	 * of appearance with CSS
	 */
	public static function revDeleteLinkDisabled( $delete = true ) {
		$msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
		$html = wfMessage( $msgKey )->escaped();
		$htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
		return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
	}

	/* Deprecated methods */

	/**
	 * @deprecated since 1.16 Use link(); warnings since 1.21
	 *
	 * Make a link for a title which may or may not be in the database. If you need to
	 * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
	 * call to this will result in a DB query.
	 *
	 * @param Title $nt The title object to make the link from, e.g. from Title::newFromText.
	 * @param string $text Link text
	 * @param string $query Optional query part
	 * @param string $trail Optional trail. Alphabetic characters at the start of this string will
	 *   be included in the link text. Other characters will be appended after
	 *   the end of the link.
	 * @param string $prefix Optional prefix. As trail, only before instead of after.
	 * @return string
	 */
	static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
		wfDeprecated( __METHOD__, '1.21' );

		$query = wfCgiToArray( $query );
		list( $inside, $trail ) = self::splitTrail( $trail );
		if ( $text === '' ) {
			$text = self::linkText( $nt );
		}

		$ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;

		return $ret;
	}

	/**
	 * @deprecated since 1.16 Use link(); warnings since 1.21
	 *
	 * Make a link for a title which definitely exists. This is faster than makeLinkObj because
	 * it doesn't have to do a database query. It's also valid for interwiki titles and special
	 * pages.
	 *
	 * @param Title $title Title object of target page
	 * @param string $text Text to replace the title
	 * @param string $query Link target
	 * @param string $trail Text after link
	 * @param string $prefix Text before link text
	 * @param string $aprops Extra attributes to the a-element
	 * @param string $style Style to apply - if empty, use getInternalLinkAttributesObj instead
	 * @return string The a-element
	 */
	static function makeKnownLinkObj(
		$title, $text = '', $query = '', $trail = '', $prefix = '', $aprops = '', $style = ''
	) {
		wfDeprecated( __METHOD__, '1.21' );

		if ( $text == '' ) {
			$text = self::linkText( $title );
		}
		$attribs = Sanitizer::mergeAttributes(
			Sanitizer::decodeTagAttributes( $aprops ),
			Sanitizer::decodeTagAttributes( $style )
		);
		$query = wfCgiToArray( $query );
		list( $inside, $trail ) = self::splitTrail( $trail );

		$ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
			array( 'known', 'noclasses' ) ) . $trail;

		return $ret;
	}

	/**
	 * Returns the attributes for the tooltip and access key.
	 * @param string $name
	 * @return array
	 */
	public static function tooltipAndAccesskeyAttribs( $name ) {
		# @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
		# no attribute" instead of "output '' as value for attribute", this
		# would be three lines.
		$attribs = array(
			'title' => self::titleAttrib( $name, 'withaccess' ),
			'accesskey' => self::accesskey( $name )
		);
		if ( $attribs['title'] === false ) {
			unset( $attribs['title'] );
		}
		if ( $attribs['accesskey'] === false ) {
			unset( $attribs['accesskey'] );
		}
		return $attribs;
	}

	/**
	 * Returns raw bits of HTML, use titleAttrib()
	 * @param string $name
	 * @param array|null $options
	 * @return null|string
	 */
	public static function tooltip( $name, $options = null ) {
		# @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
		# no attribute" instead of "output '' as value for attribute", this
		# would be two lines.
		$tooltip = self::titleAttrib( $name, $options );
		if ( $tooltip === false ) {
			return '';
		}
		return Xml::expandAttributes( array(
			'title' => $tooltip
		) );
	}
}

/**
 * @since 1.18
 */
class DummyLinker {

	/**
	 * Use PHP's magic __call handler to transform instance calls to a dummy instance
	 * into static calls to the new Linker for backwards compatibility.
	 *
	 * @param string $fname Name of called method
	 * @param array $args Arguments to the method
	 * @return mixed
	 */
	public function __call( $fname, $args ) {
		return call_user_func_array( array( 'Linker', $fname ), $args );
	}
}