summaryrefslogtreecommitdiffstats
path: root/accessible/ipc/RemoteAccessible.cpp
blob: 0077750ed3c3067803b37c9ff9b0302bff30439d (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
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "ARIAMap.h"
#include "CachedTableAccessible.h"
#include "RemoteAccessible.h"
#include "mozilla/a11y/DocAccessibleParent.h"
#include "mozilla/a11y/DocManager.h"
#include "mozilla/a11y/Platform.h"
#include "mozilla/a11y/TableAccessible.h"
#include "mozilla/a11y/TableCellAccessible.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/BrowserParent.h"
#include "mozilla/dom/CanonicalBrowsingContext.h"
#include "mozilla/gfx/Matrix.h"
#include "nsAccessibilityService.h"
#include "mozilla/Unused.h"
#include "nsAccUtils.h"
#include "nsTextEquivUtils.h"
#include "Pivot.h"
#include "Relation.h"
#include "mozilla/a11y/RelationType.h"
#include "xpcAccessibleDocument.h"

#ifdef A11Y_LOG
#  include "Logging.h"
#  define VERIFY_CACHE(domain)                                     \
    if (logging::IsEnabled(logging::eCache)) {                     \
      Unused << mDoc->SendVerifyCache(mID, domain, mCachedFields); \
    }
#else
#  define VERIFY_CACHE(domain) \
    do {                       \
    } while (0)

#endif

namespace mozilla {
namespace a11y {

void RemoteAccessible::Shutdown() {
  MOZ_DIAGNOSTIC_ASSERT(!IsDoc());
  xpcAccessibleDocument* xpcDoc =
      GetAccService()->GetCachedXPCDocument(Document());
  if (xpcDoc) {
    xpcDoc->NotifyOfShutdown(static_cast<RemoteAccessible*>(this));
  }

  if (IsTable() || IsTableCell()) {
    CachedTableAccessible::Invalidate(this);
  }

  // Remove this acc's relation map from the doc's map of
  // reverse relations. Prune forward relations associated with this
  // acc's reverse relations. This also removes the acc's map of reverse
  // rels from the mDoc's mReverseRelations.
  PruneRelationsOnShutdown();

  // XXX Ideally  this wouldn't be necessary, but it seems OuterDoc
  // accessibles can be destroyed before the doc they own.
  uint32_t childCount = mChildren.Length();
  if (!IsOuterDoc()) {
    for (uint32_t idx = 0; idx < childCount; idx++) mChildren[idx]->Shutdown();
  } else {
    if (childCount > 1) {
      MOZ_CRASH("outer doc has too many documents!");
    } else if (childCount == 1) {
      mChildren[0]->AsDoc()->Unbind();
    }
  }

  mChildren.Clear();
  ProxyDestroyed(static_cast<RemoteAccessible*>(this));
  mDoc->RemoveAccessible(static_cast<RemoteAccessible*>(this));
}

void RemoteAccessible::SetChildDoc(DocAccessibleParent* aChildDoc) {
  MOZ_ASSERT(aChildDoc);
  MOZ_ASSERT(mChildren.Length() == 0);
  mChildren.AppendElement(aChildDoc);
}

void RemoteAccessible::ClearChildDoc(DocAccessibleParent* aChildDoc) {
  MOZ_ASSERT(aChildDoc);
  // This is possible if we're replacing one document with another: Doc 1
  // has not had a chance to remove itself, but was already replaced by Doc 2
  // in SetChildDoc(). This could result in two subsequent calls to
  // ClearChildDoc() even though mChildren.Length() == 1.
  MOZ_ASSERT(mChildren.Length() <= 1);
  mChildren.RemoveElement(aChildDoc);
}

uint32_t RemoteAccessible::EmbeddedChildCount() {
  size_t count = 0, kids = mChildren.Length();
  for (size_t i = 0; i < kids; i++) {
    if (mChildren[i]->IsEmbeddedObject()) {
      count++;
    }
  }

  return count;
}

int32_t RemoteAccessible::IndexOfEmbeddedChild(Accessible* aChild) {
  size_t index = 0, kids = mChildren.Length();
  for (size_t i = 0; i < kids; i++) {
    if (mChildren[i]->IsEmbeddedObject()) {
      if (mChildren[i] == aChild) {
        return index;
      }

      index++;
    }
  }

  return -1;
}

Accessible* RemoteAccessible::EmbeddedChildAt(uint32_t aChildIdx) {
  size_t index = 0, kids = mChildren.Length();
  for (size_t i = 0; i < kids; i++) {
    if (!mChildren[i]->IsEmbeddedObject()) {
      continue;
    }

    if (index == aChildIdx) {
      return mChildren[i];
    }

    index++;
  }

  return nullptr;
}

LocalAccessible* RemoteAccessible::OuterDocOfRemoteBrowser() const {
  auto tab = static_cast<dom::BrowserParent*>(mDoc->Manager());
  dom::Element* frame = tab->GetOwnerElement();
  NS_ASSERTION(frame, "why isn't the tab in a frame!");
  if (!frame) return nullptr;

  DocAccessible* chromeDoc = GetExistingDocAccessible(frame->OwnerDoc());

  return chromeDoc ? chromeDoc->GetAccessible(frame) : nullptr;
}

void RemoteAccessible::SetParent(RemoteAccessible* aParent) {
  if (!aParent) {
    mParent = kNoParent;
  } else {
    MOZ_ASSERT(!IsDoc() || !aParent->IsDoc());
    mParent = aParent->ID();
  }
}

RemoteAccessible* RemoteAccessible::RemoteParent() const {
  if (mParent == kNoParent) {
    return nullptr;
  }

  // if we are not a document then are parent is another proxy in the same
  // document.  That means we can just ask our document for the proxy with our
  // parent id.
  if (!IsDoc()) {
    return Document()->GetAccessible(mParent);
  }

  // If we are a top level document then our parent is not a proxy.
  if (AsDoc()->IsTopLevel()) {
    return nullptr;
  }

  // Finally if we are a non top level document then our parent id is for a
  // proxy in our parent document so get the proxy from there.
  DocAccessibleParent* parentDoc = AsDoc()->ParentDoc();
  MOZ_ASSERT(parentDoc);
  MOZ_ASSERT(mParent);
  return parentDoc->GetAccessible(mParent);
}

void RemoteAccessible::ApplyCache(CacheUpdateType aUpdateType,
                                  AccAttributes* aFields) {
  if (!aFields) {
    MOZ_ASSERT_UNREACHABLE("ApplyCache called with aFields == null");
    return;
  }

  const nsTArray<bool> relUpdatesNeeded = PreProcessRelations(aFields);
  if (auto maybeViewportCache =
          aFields->GetAttribute<nsTArray<uint64_t>>(CacheKey::Viewport)) {
    // Updating the viewport cache means the offscreen state of this
    // document's accessibles has changed. Update the HashSet we use for
    // checking offscreen state here.
    MOZ_ASSERT(IsDoc(),
               "Fetched the viewport cache from a non-doc accessible?");
    AsDoc()->mOnScreenAccessibles.Clear();
    for (auto id : *maybeViewportCache) {
      AsDoc()->mOnScreenAccessibles.Insert(id);
    }
  }

  if (aUpdateType == CacheUpdateType::Initial) {
    mCachedFields = aFields;
  } else {
    if (!mCachedFields) {
      // The fields cache can be uninitialized if there were no cache-worthy
      // fields in the initial cache push.
      // We don't do a simple assign because we don't want to store the
      // DeleteEntry entries.
      mCachedFields = new AccAttributes();
    }
    mCachedFields->Update(aFields);
  }

  if (IsTextLeaf()) {
    RemoteAccessible* parent = RemoteParent();
    if (parent && parent->IsHyperText()) {
      parent->InvalidateCachedHyperTextOffsets();
    }
  }

  PostProcessRelations(relUpdatesNeeded);
}

ENameValueFlag RemoteAccessible::Name(nsString& aName) const {
  ENameValueFlag nameFlag = eNameOK;
  if (mCachedFields) {
    if (IsText()) {
      mCachedFields->GetAttribute(CacheKey::Text, aName);
      return eNameOK;
    }
    auto cachedNameFlag =
        mCachedFields->GetAttribute<int32_t>(CacheKey::NameValueFlag);
    if (cachedNameFlag) {
      nameFlag = static_cast<ENameValueFlag>(*cachedNameFlag);
    }
    if (mCachedFields->GetAttribute(CacheKey::Name, aName)) {
      VERIFY_CACHE(CacheDomain::NameAndDescription);
      return nameFlag;
    }
  }

  MOZ_ASSERT(aName.IsEmpty());
  aName.SetIsVoid(true);
  return nameFlag;
}

void RemoteAccessible::Description(nsString& aDescription) const {
  if (mCachedFields) {
    mCachedFields->GetAttribute(CacheKey::Description, aDescription);
    VERIFY_CACHE(CacheDomain::NameAndDescription);
  }
}

void RemoteAccessible::Value(nsString& aValue) const {
  if (mCachedFields) {
    if (mCachedFields->HasAttribute(CacheKey::TextValue)) {
      mCachedFields->GetAttribute(CacheKey::TextValue, aValue);
      VERIFY_CACHE(CacheDomain::Value);
      return;
    }

    if (HasNumericValue()) {
      double checkValue = CurValue();
      if (!std::isnan(checkValue)) {
        aValue.AppendFloat(checkValue);
      }
      return;
    }

    const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
    // Value of textbox is a textified subtree.
    if (roleMapEntry && roleMapEntry->Is(nsGkAtoms::textbox)) {
      nsTextEquivUtils::GetTextEquivFromSubtree(this, aValue);
      return;
    }

    if (IsCombobox()) {
      // For combo boxes, rely on selection state to determine the value.
      const Accessible* option =
          const_cast<RemoteAccessible*>(this)->GetSelectedItem(0);
      if (option) {
        option->Name(aValue);
      } else {
        // If no selected item, determine the value from descendant elements.
        nsTextEquivUtils::GetTextEquivFromSubtree(this, aValue);
      }
      return;
    }

    if (IsTextLeaf() || IsImage()) {
      if (const Accessible* actionAcc = ActionAncestor()) {
        if (const_cast<Accessible*>(actionAcc)->State() & states::LINKED) {
          // Text and image descendants of links expose the link URL as the
          // value.
          return actionAcc->Value(aValue);
        }
      }
    }
  }
}

double RemoteAccessible::CurValue() const {
  if (mCachedFields) {
    if (auto value =
            mCachedFields->GetAttribute<double>(CacheKey::NumericValue)) {
      VERIFY_CACHE(CacheDomain::Value);
      return *value;
    }
  }

  return UnspecifiedNaN<double>();
}

double RemoteAccessible::MinValue() const {
  if (mCachedFields) {
    if (auto min = mCachedFields->GetAttribute<double>(CacheKey::MinValue)) {
      VERIFY_CACHE(CacheDomain::Value);
      return *min;
    }
  }

  return UnspecifiedNaN<double>();
}

double RemoteAccessible::MaxValue() const {
  if (mCachedFields) {
    if (auto max = mCachedFields->GetAttribute<double>(CacheKey::MaxValue)) {
      VERIFY_CACHE(CacheDomain::Value);
      return *max;
    }
  }

  return UnspecifiedNaN<double>();
}

double RemoteAccessible::Step() const {
  if (mCachedFields) {
    if (auto step = mCachedFields->GetAttribute<double>(CacheKey::Step)) {
      VERIFY_CACHE(CacheDomain::Value);
      return *step;
    }
  }

  return UnspecifiedNaN<double>();
}

bool RemoteAccessible::SetCurValue(double aValue) {
  if (!HasNumericValue() || IsProgress()) {
    return false;
  }

  const uint32_t kValueCannotChange = states::READONLY | states::UNAVAILABLE;
  if (State() & kValueCannotChange) {
    return false;
  }

  double checkValue = MinValue();
  if (!std::isnan(checkValue) && aValue < checkValue) {
    return false;
  }

  checkValue = MaxValue();
  if (!std::isnan(checkValue) && aValue > checkValue) {
    return false;
  }

  Unused << mDoc->SendSetCurValue(mID, aValue);
  return true;
}

bool RemoteAccessible::ContainsPoint(int32_t aX, int32_t aY) {
  if (!BoundsWithOffset(Nothing(), true).Contains(aX, aY)) {
    return false;
  }
  if (!IsTextLeaf()) {
    if (IsImage() || IsImageMap() || !HasChildren() ||
        RefPtr{DisplayStyle()} != nsGkAtoms::inlinevalue) {
      // This isn't an inline element that might contain text, so we don't need
      // to walk lines. It's enough that our rect contains the point.
      return true;
    }
    // Non-image inline elements with children can wrap across lines just like
    // text leaves; see below.
    // Walk the children, which will walk the lines of text in any text leaves.
    uint32_t count = ChildCount();
    for (uint32_t c = 0; c < count; ++c) {
      RemoteAccessible* child = RemoteChildAt(c);
      if (child->Role() == roles::TEXT_CONTAINER && child->IsClipped()) {
        // There is a clipped child. This is a candidate for fuzzy hit testing.
        // See RemoteAccessible::DoFuzzyHittesting.
        return true;
      }
      if (child->ContainsPoint(aX, aY)) {
        return true;
      }
    }
    // None of our descendants contain the point, so nor do we.
    return false;
  }
  // This is a text leaf. The text might wrap across lines, which means our
  // rect might cover a wider area than the actual text. For example, if the
  // text begins in the middle of the first line and wraps on to the second,
  // the rect will cover the start of the first line and the end of the second.
  auto lines = GetCachedTextLines();
  if (!lines) {
    // This means the text is empty or occupies a single line (but does not
    // begin the line). In that case, the Bounds check above is sufficient,
    // since there's only one rect.
    return true;
  }
  uint32_t length = lines->Length();
  MOZ_ASSERT(length > 0,
             "Line starts shouldn't be in cache if there aren't any");
  if (length == 0 || (length == 1 && (*lines)[0] == 0)) {
    // This means the text begins and occupies a single line. Again, the Bounds
    // check above is sufficient.
    return true;
  }
  // Walk the lines of the text. Even if this text doesn't start at the
  // beginning of a line (i.e. lines[0] > 0), we always want to consider its
  // first line.
  int32_t lineStart = 0;
  for (uint32_t index = 0; index <= length; ++index) {
    int32_t lineEnd;
    if (index < length) {
      int32_t nextLineStart = (*lines)[index];
      if (nextLineStart == 0) {
        // This Accessible starts at the beginning of a line. Here, we always
        // treat 0 as the first line start anyway.
        MOZ_ASSERT(index == 0);
        continue;
      }
      lineEnd = nextLineStart - 1;
    } else {
      // This is the last line.
      lineEnd = static_cast<int32_t>(nsAccUtils::TextLength(this)) - 1;
    }
    MOZ_ASSERT(lineEnd >= lineStart);
    nsRect lineRect = GetCachedCharRect(lineStart);
    if (lineEnd > lineStart) {
      lineRect.UnionRect(lineRect, GetCachedCharRect(lineEnd));
    }
    if (BoundsWithOffset(Some(lineRect), true).Contains(aX, aY)) {
      return true;
    }
    lineStart = lineEnd + 1;
  }
  return false;
}

RemoteAccessible* RemoteAccessible::DoFuzzyHittesting() {
  uint32_t childCount = ChildCount();
  if (!childCount) {
    return nullptr;
  }
  // Check if this match has a clipped child.
  // This usually indicates invisible text, and we're
  // interested in returning the inner text content
  // even if it doesn't contain the point we're hittesting.
  RemoteAccessible* clippedContainer = nullptr;
  for (uint32_t i = 0; i < childCount; i++) {
    RemoteAccessible* child = RemoteChildAt(i);
    if (child->Role() == roles::TEXT_CONTAINER) {
      if (child->IsClipped()) {
        clippedContainer = child;
        break;
      }
    }
  }
  // If we found a clipped container, descend it in search of
  // meaningful text leaves. Ignore non-text-leaf/text-container
  // siblings.
  RemoteAccessible* container = clippedContainer;
  while (container) {
    RemoteAccessible* textLeaf = nullptr;
    bool continueSearch = false;
    childCount = container->ChildCount();
    for (uint32_t i = 0; i < childCount; i++) {
      RemoteAccessible* child = container->RemoteChildAt(i);
      if (child->Role() == roles::TEXT_CONTAINER) {
        container = child;
        continueSearch = true;
        break;
      }
      if (child->IsTextLeaf()) {
        textLeaf = child;
        // Don't break here -- it's possible a text container
        // exists as another sibling, and we should descend as
        // deep as possible.
      }
    }
    if (textLeaf) {
      return textLeaf;
    }
    if (!continueSearch) {
      // We didn't find anything useful in this set of siblings.
      // Don't keep searching
      break;
    }
  }
  return nullptr;
}

Accessible* RemoteAccessible::ChildAtPoint(
    int32_t aX, int32_t aY, LocalAccessible::EWhichChildAtPoint aWhichChild) {
  // Elements that are partially on-screen should have their bounds masked by
  // their containing scroll area so hittesting yields results that are
  // consistent with the content's visual representation. Pass this value to
  // bounds calculation functions to indicate that we're hittesting.
  const bool hitTesting = true;

  if (IsOuterDoc() && aWhichChild == EWhichChildAtPoint::DirectChild) {
    // This is an iframe, which is as deep as the viewport cache goes. The
    // caller wants a direct child, which can only be the embedded document.
    if (BoundsWithOffset(Nothing(), hitTesting).Contains(aX, aY)) {
      return RemoteFirstChild();
    }
    return nullptr;
  }

  RemoteAccessible* lastMatch = nullptr;
  // If `this` is a document, use its viewport cache instead of
  // the cache of its parent document.
  if (DocAccessibleParent* doc = IsDoc() ? AsDoc() : mDoc) {
    if (!doc->mCachedFields) {
      // A client call might arrive after we've constructed doc but before we
      // get a cache push for it.
      return nullptr;
    }
    if (auto maybeViewportCache =
            doc->mCachedFields->GetAttribute<nsTArray<uint64_t>>(
                CacheKey::Viewport)) {
      // The retrieved viewport cache contains acc IDs in hittesting order.
      // That is, items earlier in the list have z-indexes that are larger than
      // those later in the list. If you were to build a tree by z-index, where
      // chilren have larger z indices than their parents, iterating this list
      // is essentially a postorder tree traversal.
      const nsTArray<uint64_t>& viewportCache = *maybeViewportCache;

      for (auto id : viewportCache) {
        RemoteAccessible* acc = doc->GetAccessible(id);
        if (!acc) {
          // This can happen if the acc died in between
          // pushing the viewport cache and doing this hittest
          continue;
        }

        if (acc->IsOuterDoc() &&
            aWhichChild == EWhichChildAtPoint::DeepestChild &&
            acc->BoundsWithOffset(Nothing(), hitTesting).Contains(aX, aY)) {
          // acc is an iframe, which is as deep as the viewport cache goes. This
          // iframe contains the requested point.
          RemoteAccessible* innerDoc = acc->RemoteFirstChild();
          if (innerDoc) {
            MOZ_ASSERT(innerDoc->IsDoc());
            // Search the embedded document's viewport cache so we return the
            // deepest descendant in that embedded document.
            Accessible* deepestAcc = innerDoc->ChildAtPoint(
                aX, aY, EWhichChildAtPoint::DeepestChild);
            MOZ_ASSERT(!deepestAcc || deepestAcc->IsRemote());
            lastMatch = deepestAcc ? deepestAcc->AsRemote() : nullptr;
            break;
          }
          // If there is no embedded document, the iframe itself is the deepest
          // descendant.
          lastMatch = acc;
          break;
        }

        if (acc == this) {
          MOZ_ASSERT(!acc->IsOuterDoc());
          // Even though we're searching from the doc's cache
          // this call shouldn't pass the boundary defined by
          // the acc this call originated on. If we hit `this`,
          // return our most recent match.
          if (!lastMatch &&
              BoundsWithOffset(Nothing(), hitTesting).Contains(aX, aY)) {
            // If we haven't found a match, but `this` contains the point we're
            // looking for, set it as our temp last match so we can
            // (potentially) do fuzzy hittesting on it below.
            lastMatch = acc;
          }
          break;
        }

        if (acc->ContainsPoint(aX, aY)) {
          // Because our rects are in hittesting order, the
          // first match we encounter is guaranteed to be the
          // deepest match.
          lastMatch = acc;
          break;
        }
      }
      if (lastMatch) {
        RemoteAccessible* fuzzyMatch = lastMatch->DoFuzzyHittesting();
        lastMatch = fuzzyMatch ? fuzzyMatch : lastMatch;
      }
    }
  }

  if (aWhichChild == EWhichChildAtPoint::DirectChild && lastMatch) {
    // lastMatch is the deepest match. Walk up to the direct child of this.
    RemoteAccessible* parent = lastMatch->RemoteParent();
    for (;;) {
      if (parent == this) {
        break;
      }
      if (!parent || parent->IsDoc()) {
        // `this` is not an ancestor of lastMatch. Ignore lastMatch.
        lastMatch = nullptr;
        break;
      }
      lastMatch = parent;
      parent = parent->RemoteParent();
    }
  } else if (aWhichChild == EWhichChildAtPoint::DeepestChild && lastMatch &&
             !IsDoc() && !IsAncestorOf(lastMatch)) {
    // If we end up with a match that is not in the ancestor chain
    // of the accessible this call originated on, we should ignore it.
    // This can happen when the aX, aY given are outside `this`.
    lastMatch = nullptr;
  }

  if (!lastMatch && BoundsWithOffset(Nothing(), hitTesting).Contains(aX, aY)) {
    // Even though the hit target isn't inside `this`, the point is still
    // within our bounds, so fall back to `this`.
    return this;
  }

  return lastMatch;
}

Maybe<nsRect> RemoteAccessible::RetrieveCachedBounds() const {
  if (!mCachedFields) {
    return Nothing();
  }

  Maybe<const nsTArray<int32_t>&> maybeArray =
      mCachedFields->GetAttribute<nsTArray<int32_t>>(
          CacheKey::ParentRelativeBounds);
  if (maybeArray) {
    const nsTArray<int32_t>& relativeBoundsArr = *maybeArray;
    MOZ_ASSERT(relativeBoundsArr.Length() == 4,
               "Incorrectly sized bounds array");
    nsRect relativeBoundsRect(relativeBoundsArr[0], relativeBoundsArr[1],
                              relativeBoundsArr[2], relativeBoundsArr[3]);
    return Some(relativeBoundsRect);
  }

  return Nothing();
}

void RemoteAccessible::ApplyCrossDocOffset(nsRect& aBounds) const {
  if (!IsDoc()) {
    // We should only apply cross-doc offsets to documents. If we're anything
    // else, return early here.
    return;
  }

  RemoteAccessible* parentAcc = RemoteParent();
  if (!parentAcc || !parentAcc->IsOuterDoc()) {
    return;
  }

  Maybe<const nsTArray<int32_t>&> maybeOffset =
      parentAcc->mCachedFields->GetAttribute<nsTArray<int32_t>>(
          CacheKey::CrossDocOffset);
  if (!maybeOffset) {
    return;
  }

  MOZ_ASSERT(maybeOffset->Length() == 2);
  const nsTArray<int32_t>& offset = *maybeOffset;
  // Our retrieved value is in app units, so we don't need to do any
  // unit conversion here.
  aBounds.MoveBy(offset[0], offset[1]);
}

bool RemoteAccessible::ApplyTransform(nsRect& aCumulativeBounds) const {
  // First, attempt to retrieve the transform from the cache.
  Maybe<const UniquePtr<gfx::Matrix4x4>&> maybeTransform =
      mCachedFields->GetAttribute<UniquePtr<gfx::Matrix4x4>>(
          CacheKey::TransformMatrix);
  if (!maybeTransform) {
    return false;
  }

  auto mtxInPixels = gfx::Matrix4x4Typed<CSSPixel, CSSPixel>::FromUnknownMatrix(
      *(*maybeTransform));

  // Our matrix is in CSS Pixels, so we need our rect to be in CSS
  // Pixels too. Convert before applying.
  auto boundsInPixels = CSSRect::FromAppUnits(aCumulativeBounds);
  boundsInPixels = mtxInPixels.TransformBounds(boundsInPixels);
  aCumulativeBounds = CSSRect::ToAppUnits(boundsInPixels);

  return true;
}

bool RemoteAccessible::ApplyScrollOffset(nsRect& aBounds) const {
  Maybe<const nsTArray<int32_t>&> maybeScrollPosition =
      mCachedFields->GetAttribute<nsTArray<int32_t>>(CacheKey::ScrollPosition);

  if (!maybeScrollPosition || maybeScrollPosition->Length() != 2) {
    return false;
  }
  // Our retrieved value is in app units, so we don't need to do any
  // unit conversion here.
  const nsTArray<int32_t>& scrollPosition = *maybeScrollPosition;

  // Scroll position is an inverse representation of scroll offset (since the
  // further the scroll bar moves down the page, the further the page content
  // moves up/closer to the origin).
  nsPoint scrollOffset(-scrollPosition[0], -scrollPosition[1]);

  aBounds.MoveBy(scrollOffset.x, scrollOffset.y);

  // Return true here even if the scroll offset was 0,0 because the RV is used
  // as a scroll container indicator. Non-scroll containers won't have cached
  // scroll position.
  return true;
}

nsRect RemoteAccessible::BoundsInAppUnits() const {
  if (dom::CanonicalBrowsingContext* cbc = mDoc->GetBrowsingContext()->Top()) {
    if (dom::BrowserParent* bp = cbc->GetBrowserParent()) {
      DocAccessibleParent* topDoc = bp->GetTopLevelDocAccessible();
      if (topDoc && topDoc->mCachedFields) {
        auto appUnitsPerDevPixel = topDoc->mCachedFields->GetAttribute<int32_t>(
            CacheKey::AppUnitsPerDevPixel);
        MOZ_ASSERT(appUnitsPerDevPixel);
        return LayoutDeviceIntRect::ToAppUnits(Bounds(), *appUnitsPerDevPixel);
      }
    }
  }
  return LayoutDeviceIntRect::ToAppUnits(Bounds(), AppUnitsPerCSSPixel());
}

bool RemoteAccessible::IsFixedPos() const {
  MOZ_ASSERT(mCachedFields);
  if (auto maybePosition =
          mCachedFields->GetAttribute<RefPtr<nsAtom>>(CacheKey::CssPosition)) {
    return *maybePosition == nsGkAtoms::fixed;
  }

  return false;
}

bool RemoteAccessible::IsOverflowHidden() const {
  MOZ_ASSERT(mCachedFields);
  if (auto maybeOverflow =
          mCachedFields->GetAttribute<RefPtr<nsAtom>>(CacheKey::CSSOverflow)) {
    return *maybeOverflow == nsGkAtoms::hidden;
  }

  return false;
}

bool RemoteAccessible::IsClipped() const {
  MOZ_ASSERT(mCachedFields);
  if (mCachedFields->GetAttribute<bool>(CacheKey::IsClipped)) {
    return true;
  }

  return false;
}

LayoutDeviceIntRect RemoteAccessible::BoundsWithOffset(
    Maybe<nsRect> aOffset, bool aBoundsAreForHittesting) const {
  Maybe<nsRect> maybeBounds = RetrieveCachedBounds();
  if (maybeBounds) {
    nsRect bounds = *maybeBounds;
    // maybeBounds is parent-relative. However, the transform matrix we cache
    // (if any) is meant to operate on self-relative rects. Therefore, make
    // bounds self-relative until after we transform.
    bounds.MoveTo(0, 0);
    const DocAccessibleParent* topDoc = IsDoc() ? AsDoc() : nullptr;

    if (aOffset.isSome()) {
      // The rect we've passed in is in app units, so no conversion needed.
      nsRect internalRect = *aOffset;
      bounds.SetRectX(bounds.x + internalRect.x, internalRect.width);
      bounds.SetRectY(bounds.y + internalRect.y, internalRect.height);
    }

    Unused << ApplyTransform(bounds);
    // Now apply the parent-relative offset.
    bounds.MoveBy(maybeBounds->TopLeft());

    ApplyCrossDocOffset(bounds);

    LayoutDeviceIntRect devPxBounds;
    const Accessible* acc = Parent();
    bool encounteredFixedContainer = IsFixedPos();
    while (acc && acc->IsRemote()) {
      // Return early if we're hit testing and our cumulative bounds are empty,
      // since walking the ancestor chain won't produce any hits.
      if (aBoundsAreForHittesting && bounds.IsEmpty()) {
        return LayoutDeviceIntRect{};
      }

      RemoteAccessible* remoteAcc = const_cast<Accessible*>(acc)->AsRemote();

      if (Maybe<nsRect> maybeRemoteBounds = remoteAcc->RetrieveCachedBounds()) {
        nsRect remoteBounds = *maybeRemoteBounds;
        // We need to take into account a non-1 resolution set on the
        // presshell. This happens with async pinch zooming, among other
        // things. We can't reliably query this value in the parent process,
        // so we retrieve it from the document's cache.
        if (remoteAcc->IsDoc()) {
          // Apply the document's resolution to the bounds we've gathered
          // thus far. We do this before applying the document's offset
          // because document accs should not have their bounds scaled by
          // their own resolution. They should be scaled by the resolution
          // of their containing document (if any).
          Maybe<float> res =
              remoteAcc->AsDoc()->mCachedFields->GetAttribute<float>(
                  CacheKey::Resolution);
          MOZ_ASSERT(res, "No cached document resolution found.");
          bounds.ScaleRoundOut(res.valueOr(1.0f));

          topDoc = remoteAcc->AsDoc();
        }

        // We don't account for the document offset of iframes when
        // computing parent-relative bounds. Instead, we store this value
        // separately on all iframes and apply it here. See the comments in
        // LocalAccessible::BundleFieldsForCache where we set the
        // nsGkAtoms::crossorigin attribute.
        remoteAcc->ApplyCrossDocOffset(remoteBounds);
        if (!encounteredFixedContainer) {
          // Apply scroll offset, if applicable. Only the contents of an
          // element are affected by its scroll offset, which is why this call
          // happens in this loop instead of both inside and outside of
          // the loop (like ApplyTransform).
          // Never apply scroll offsets past a fixed container.
          const bool hasScrollArea = remoteAcc->ApplyScrollOffset(bounds);

          // If we are hit testing and the Accessible has a scroll area, ensure
          // that the bounds we've calculated so far are constrained to the
          // bounds of the scroll area. Without this, we'll "hit" the off-screen
          // portions of accs that are are partially (but not fully) within the
          // scroll area. This is also a problem for accs with overflow:hidden;
          if (aBoundsAreForHittesting &&
              (hasScrollArea || remoteAcc->IsOverflowHidden())) {
            nsRect selfRelativeVisibleBounds(0, 0, remoteBounds.width,
                                             remoteBounds.height);
            bounds = bounds.SafeIntersect(selfRelativeVisibleBounds);
          }
        }
        if (remoteAcc->IsDoc()) {
          // Fixed elements are document relative, so if we've hit a
          // document we're now subject to that document's styling
          // (including scroll offsets that operate on it).
          // This ordering is important, we don't want to apply scroll
          // offsets on this doc's content.
          encounteredFixedContainer = false;
        }
        if (!encounteredFixedContainer) {
          // The transform matrix we cache (if any) is meant to operate on
          // self-relative rects. Therefore, we must apply the transform before
          // we make bounds parent-relative.
          Unused << remoteAcc->ApplyTransform(bounds);
          // Regardless of whether this is a doc, we should offset `bounds`
          // by the bounds retrieved here. This is how we build screen
          // coordinates from relative coordinates.
          bounds.MoveBy(remoteBounds.X(), remoteBounds.Y());
        }

        if (remoteAcc->IsFixedPos()) {
          encounteredFixedContainer = true;
        }
        // we can't just break here if we're scroll suppressed because we still
        // need to find the top doc.
      }
      acc = acc->Parent();
    }

    MOZ_ASSERT(topDoc);
    if (topDoc) {
      // We use the top documents app-units-per-dev-pixel even though
      // theoretically nested docs can have different values. Practically,
      // that isn't likely since we only offer zoom controls for the top
      // document and all subdocuments inherit from it.
      auto appUnitsPerDevPixel = topDoc->mCachedFields->GetAttribute<int32_t>(
          CacheKey::AppUnitsPerDevPixel);
      MOZ_ASSERT(appUnitsPerDevPixel);
      if (appUnitsPerDevPixel) {
        // Convert our existing `bounds` rect from app units to dev pixels
        devPxBounds = LayoutDeviceIntRect::FromAppUnitsToNearest(
            bounds, *appUnitsPerDevPixel);
      }
    }

#if !defined(ANDROID)
    // This block is not thread safe because it queries a LocalAccessible.
    // It is also not needed in Android since the only local accessible is
    // the outer doc browser that has an offset of 0.
    // acc could be null if the OuterDocAccessible died before the top level
    // DocAccessibleParent.
    if (LocalAccessible* localAcc =
            acc ? const_cast<Accessible*>(acc)->AsLocal() : nullptr) {
      // LocalAccessible::Bounds returns screen-relative bounds in
      // dev pixels.
      LayoutDeviceIntRect localBounds = localAcc->Bounds();

      // The root document will always have an APZ resolution of 1,
      // so we don't factor in its scale here. We also don't scale
      // by GetFullZoom because LocalAccessible::Bounds already does
      // that.
      devPxBounds.MoveBy(localBounds.X(), localBounds.Y());
    }
#endif

    return devPxBounds;
  }

  return LayoutDeviceIntRect();
}

LayoutDeviceIntRect RemoteAccessible::Bounds() const {
  return BoundsWithOffset(Nothing());
}

Relation RemoteAccessible::RelationByType(RelationType aType) const {
  // We are able to handle some relations completely in the
  // parent process, without the help of the cache. Those
  // relations are enumerated here. Other relations, whose
  // types are stored in kRelationTypeAtoms, are processed
  // below using the cache.
  if (aType == RelationType::CONTAINING_TAB_PANE) {
    if (dom::CanonicalBrowsingContext* cbc = mDoc->GetBrowsingContext()) {
      if (dom::CanonicalBrowsingContext* topCbc = cbc->Top()) {
        if (dom::BrowserParent* bp = topCbc->GetBrowserParent()) {
          return Relation(bp->GetTopLevelDocAccessible());
        }
      }
    }
    return Relation();
  }

  if (aType == RelationType::LINKS_TO && Role() == roles::LINK) {
    Pivot p = Pivot(mDoc);
    nsString href;
    Value(href);
    int32_t i = href.FindChar('#');
    int32_t len = static_cast<int32_t>(href.Length());
    if (i != -1 && i < (len - 1)) {
      nsDependentSubstring anchorName = Substring(href, i + 1, len);
      MustPruneSameDocRule rule;
      Accessible* nameMatch = nullptr;
      for (Accessible* match = p.Next(mDoc, rule); match;
           match = p.Next(match, rule)) {
        nsString currID;
        match->DOMNodeID(currID);
        MOZ_ASSERT(match->IsRemote());
        if (anchorName.Equals(currID)) {
          return Relation(match->AsRemote());
        }
        if (!nameMatch) {
          nsString currName = match->AsRemote()->GetCachedHTMLNameAttribute();
          if (match->TagName() == nsGkAtoms::a && anchorName.Equals(currName)) {
            // If we find an element with a matching ID, we should return
            // that, but if we don't we should return the first anchor with
            // a matching name. To avoid doing two traversals, store the first
            // name match here.
            nameMatch = match;
          }
        }
      }
      return nameMatch ? Relation(nameMatch->AsRemote()) : Relation();
    }

    return Relation();
  }

  // Handle ARIA tree, treegrid parent/child relations. Each of these cases
  // relies on cached group info. To find the parent of an accessible, use the
  // unified conceptual parent.
  if (aType == RelationType::NODE_CHILD_OF) {
    const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
    if (roleMapEntry && (roleMapEntry->role == roles::OUTLINEITEM ||
                         roleMapEntry->role == roles::LISTITEM ||
                         roleMapEntry->role == roles::ROW)) {
      if (const AccGroupInfo* groupInfo =
              const_cast<RemoteAccessible*>(this)->GetOrCreateGroupInfo()) {
        return Relation(groupInfo->ConceptualParent());
      }
    }
    return Relation();
  }

  // To find the children of a parent, provide an iterator through its items.
  if (aType == RelationType::NODE_PARENT_OF) {
    const nsRoleMapEntry* roleMapEntry = ARIARoleMap();
    if (roleMapEntry && (roleMapEntry->role == roles::OUTLINEITEM ||
                         roleMapEntry->role == roles::LISTITEM ||
                         roleMapEntry->role == roles::ROW ||
                         roleMapEntry->role == roles::OUTLINE ||
                         roleMapEntry->role == roles::LIST ||
                         roleMapEntry->role == roles::TREE_TABLE)) {
      return Relation(new ItemIterator(this));
    }
    return Relation();
  }

  if (aType == RelationType::MEMBER_OF) {
    Relation rel = Relation();
    // HTML radio buttons with cached names should be grouped.
    if (IsHTMLRadioButton()) {
      nsString name = GetCachedHTMLNameAttribute();
      if (name.IsEmpty()) {
        return rel;
      }

      RemoteAccessible* ancestor = RemoteParent();
      while (ancestor && ancestor->Role() != roles::FORM && ancestor != mDoc) {
        ancestor = ancestor->RemoteParent();
      }
      if (ancestor) {
        // Sometimes we end up with an unparented acc here, potentially
        // because the acc is being moved. See bug 1807639.
        // Pivot expects to be created with a non-null mRoot.
        Pivot p = Pivot(ancestor);
        PivotRadioNameRule rule(name);
        Accessible* match = p.Next(ancestor, rule);
        while (match) {
          rel.AppendTarget(match->AsRemote());
          match = p.Next(match, rule);
        }
      }
      return rel;
    }

    if (IsARIARole(nsGkAtoms::radio)) {
      // ARIA radio buttons should be grouped by their radio group
      // parent, if one exists.
      RemoteAccessible* currParent = RemoteParent();
      while (currParent && currParent->Role() != roles::RADIO_GROUP) {
        currParent = currParent->RemoteParent();
      }

      if (currParent && currParent->Role() == roles::RADIO_GROUP) {
        // If we found a radiogroup parent, search for all
        // roles::RADIOBUTTON children and add them to our relation.
        // This search will include the radio button this method
        // was called from, which is expected.
        Pivot p = Pivot(currParent);
        PivotRoleRule rule(roles::RADIOBUTTON);
        Accessible* match = p.Next(currParent, rule);
        while (match) {
          MOZ_ASSERT(match->IsRemote(),
                     "We should only be traversing the remote tree.");
          rel.AppendTarget(match->AsRemote());
          match = p.Next(match, rule);
        }
      }
    }
    // By webkit's standard, aria radio buttons do not get grouped
    // if they lack a group parent, so we return an empty
    // relation here if the above check fails.
    return rel;
  }

  Relation rel;
  if (!mCachedFields) {
    return rel;
  }

  for (const auto& data : kRelationTypeAtoms) {
    if (data.mType != aType ||
        (data.mValidTag && TagName() != data.mValidTag)) {
      continue;
    }

    if (auto maybeIds =
            mCachedFields->GetAttribute<nsTArray<uint64_t>>(data.mAtom)) {
      rel.AppendIter(new RemoteAccIterator(*maybeIds, Document()));
    }
    // Each relation type has only one relevant cached attribute,
    // so break after we've handled the attr for this type,
    // even if we didn't find any targets.
    break;
  }

  if (auto accRelMapEntry = mDoc->mReverseRelations.Lookup(ID())) {
    if (auto reverseIdsEntry = accRelMapEntry.Data().Lookup(aType)) {
      rel.AppendIter(new RemoteAccIterator(reverseIdsEntry.Data(), Document()));
    }
  }

  // We handle these relations here rather than before cached relations because
  // the cached relations need to take precedence. For example, a <figure> with
  // both aria-labelledby and a <figcaption> must return two LABELLED_BY
  // targets: the aria-labelledby and then the <figcaption>.
  if (aType == RelationType::LABELLED_BY && TagName() == nsGkAtoms::figure) {
    uint32_t count = ChildCount();
    for (uint32_t c = 0; c < count; ++c) {
      RemoteAccessible* child = RemoteChildAt(c);
      MOZ_ASSERT(child);
      if (child->TagName() == nsGkAtoms::figcaption) {
        rel.AppendTarget(child);
      }
    }
  } else if (aType == RelationType::LABEL_FOR &&
             TagName() == nsGkAtoms::figcaption) {
    if (RemoteAccessible* parent = RemoteParent()) {
      if (parent->TagName() == nsGkAtoms::figure) {
        rel.AppendTarget(parent);
      }
    }
  }

  return rel;
}

void RemoteAccessible::AppendTextTo(nsAString& aText, uint32_t aStartOffset,
                                    uint32_t aLength) {
  if (IsText()) {
    if (mCachedFields) {
      if (auto text = mCachedFields->GetAttribute<nsString>(CacheKey::Text)) {
        aText.Append(Substring(*text, aStartOffset, aLength));
      }
      VERIFY_CACHE(CacheDomain::Text);
    }
    return;
  }

  if (aStartOffset != 0 || aLength == 0) {
    return;
  }

  if (IsHTMLBr()) {
    aText += kForcedNewLineChar;
  } else if (RemoteParent() && nsAccUtils::MustPrune(RemoteParent())) {
    // Expose the embedded object accessible as imaginary embedded object
    // character if its parent hypertext accessible doesn't expose children to
    // AT.
    aText += kImaginaryEmbeddedObjectChar;
  } else {
    aText += kEmbeddedObjectChar;
  }
}

nsTArray<bool> RemoteAccessible::PreProcessRelations(AccAttributes* aFields) {
  nsTArray<bool> updateTracker(ArrayLength(kRelationTypeAtoms));
  for (auto const& data : kRelationTypeAtoms) {
    if (data.mValidTag) {
      // The relation we're currently processing only applies to particular
      // elements. Check to see if we're one of them.
      nsAtom* tag = TagName();
      if (!tag) {
        // TagName() returns null on an initial cache push -- check aFields
        // for a tag name instead.
        if (auto maybeTag =
                aFields->GetAttribute<RefPtr<nsAtom>>(CacheKey::TagName)) {
          tag = *maybeTag;
        }
      }
      MOZ_ASSERT(
          tag || IsTextLeaf() || IsDoc(),
          "Could not fetch tag via TagName() or from initial cache push!");
      if (tag != data.mValidTag) {
        // If this rel doesn't apply to us, do no pre-processing. Also,
        // note in our updateTracker that we should do no post-processing.
        updateTracker.AppendElement(false);
        continue;
      }
    }

    nsStaticAtom* const relAtom = data.mAtom;
    auto newRelationTargets =
        aFields->GetAttribute<nsTArray<uint64_t>>(relAtom);
    bool shouldAddNewImplicitRels =
        newRelationTargets && newRelationTargets->Length();

    // Remove existing implicit relations if we need to perform an update, or
    // if we've received a DeleteEntry(). Only do this if mCachedFields is
    // initialized. If mCachedFields is not initialized, we still need to
    // construct the update array so we correctly handle reverse rels in
    // PostProcessRelations.
    if ((shouldAddNewImplicitRels ||
         aFields->GetAttribute<DeleteEntry>(relAtom)) &&
        mCachedFields) {
      if (auto maybeOldIDs =
              mCachedFields->GetAttribute<nsTArray<uint64_t>>(relAtom)) {
        for (uint64_t id : *maybeOldIDs) {
          // For each target, fetch its reverse relation map
          // We need to call `Lookup` here instead of `LookupOrInsert` because
          // it's possible the ID we're querying is from an acc that has since
          // been Shutdown(), and so has intentionally removed its reverse rels
          // from the doc's reverse rel cache.
          if (auto reverseRels = Document()->mReverseRelations.Lookup(id)) {
            // Then fetch its reverse relation's ID list. This should be safe
            // to do via LookupOrInsert because by the time we've gotten here,
            // we know the acc and `this` are still alive in the doc. If we hit
            // the following assert, we don't have parity on implicit/explicit
            // rels and something is wrong.
            nsTArray<uint64_t>& reverseRelIDs =
                reverseRels->LookupOrInsert(data.mReverseType);
            //  There might be other reverse relations stored for this acc, so
            //  remove our ID instead of deleting the array entirely.
            DebugOnly<bool> removed = reverseRelIDs.RemoveElement(ID());
            MOZ_ASSERT(removed, "Can't find old reverse relation");
          }
        }
      }
    }

    updateTracker.AppendElement(shouldAddNewImplicitRels);
  }

  return updateTracker;
}

void RemoteAccessible::PostProcessRelations(const nsTArray<bool>& aToUpdate) {
  size_t updateCount = aToUpdate.Length();
  MOZ_ASSERT(updateCount == ArrayLength(kRelationTypeAtoms),
             "Did not note update status for every relation type!");
  for (size_t i = 0; i < updateCount; i++) {
    if (aToUpdate.ElementAt(i)) {
      // Since kRelationTypeAtoms was used to generate aToUpdate, we
      // know the ith entry of aToUpdate corresponds to the relation type in
      // the ith entry of kRelationTypeAtoms. Fetch the related data here.
      auto const& data = kRelationTypeAtoms[i];

      const nsTArray<uint64_t>& newIDs =
          *mCachedFields->GetAttribute<nsTArray<uint64_t>>(data.mAtom);
      for (uint64_t id : newIDs) {
        nsTHashMap<RelationType, nsTArray<uint64_t>>& relations =
            Document()->mReverseRelations.LookupOrInsert(id);
        nsTArray<uint64_t>& ids = relations.LookupOrInsert(data.mReverseType);
        ids.AppendElement(ID());
      }
    }
  }
}

void RemoteAccessible::PruneRelationsOnShutdown() {
  auto reverseRels = mDoc->mReverseRelations.Lookup(ID());
  if (!reverseRels) {
    return;
  }
  for (auto const& data : kRelationTypeAtoms) {
    // Fetch the list of targets for this reverse relation
    auto reverseTargetList = reverseRels->Lookup(data.mReverseType);
    if (!reverseTargetList) {
      continue;
    }
    for (uint64_t id : *reverseTargetList) {
      // For each target, retrieve its corresponding forward relation target
      // list
      RemoteAccessible* affectedAcc = mDoc->GetAccessible(id);
      if (!affectedAcc) {
        // It's possible the affect acc also shut down, in which case
        // we don't have anything to update.
        continue;
      }
      if (auto forwardTargetList =
              affectedAcc->mCachedFields
                  ->GetMutableAttribute<nsTArray<uint64_t>>(data.mAtom)) {
        forwardTargetList->RemoveElement(ID());
        if (!forwardTargetList->Length()) {
          // The ID we removed was the only thing in the list, so remove the
          // entry from the cache entirely -- don't leave an empty array.
          affectedAcc->mCachedFields->Remove(data.mAtom);
        }
      }
    }
  }
  // Remove this ID from the document's map of reverse relations.
  reverseRels.Remove();
}

uint32_t RemoteAccessible::GetCachedTextLength() {
  MOZ_ASSERT(!HasChildren());
  if (!mCachedFields) {
    return 0;
  }
  VERIFY_CACHE(CacheDomain::Text);
  auto text = mCachedFields->GetAttribute<nsString>(CacheKey::Text);
  if (!text) {
    return 0;
  }
  return text->Length();
}

Maybe<const nsTArray<int32_t>&> RemoteAccessible::GetCachedTextLines() {
  MOZ_ASSERT(!HasChildren());
  if (!mCachedFields) {
    return Nothing();
  }
  VERIFY_CACHE(CacheDomain::Text);
  return mCachedFields->GetAttribute<nsTArray<int32_t>>(
      CacheKey::TextLineStarts);
}

nsRect RemoteAccessible::GetCachedCharRect(int32_t aOffset) {
  MOZ_ASSERT(IsText());
  if (!mCachedFields) {
    return nsRect();
  }

  if (Maybe<const nsTArray<int32_t>&> maybeCharData =
          mCachedFields->GetAttribute<nsTArray<int32_t>>(
              CacheKey::TextBounds)) {
    const nsTArray<int32_t>& charData = *maybeCharData;
    const int32_t index = aOffset * kNumbersInRect;
    if (index < static_cast<int32_t>(charData.Length())) {
      return nsRect(charData[index], charData[index + 1], charData[index + 2],
                    charData[index + 3]);
    }
    // It is valid for a client to call this with an offset 1 after the last
    // character because of the insertion point at the end of text boxes.
    MOZ_ASSERT(index == static_cast<int32_t>(charData.Length()));
  }

  return nsRect();
}

void RemoteAccessible::DOMNodeID(nsString& aID) const {
  if (mCachedFields) {
    mCachedFields->GetAttribute(CacheKey::DOMNodeID, aID);
    VERIFY_CACHE(CacheDomain::DOMNodeIDAndClass);
  }
}

void RemoteAccessible::DOMNodeClass(nsString& aClass) const {
  if (mCachedFields) {
    mCachedFields->GetAttribute(CacheKey::DOMNodeClass, aClass);
    VERIFY_CACHE(CacheDomain::DOMNodeIDAndClass);
  }
}

void RemoteAccessible::ScrollToPoint(uint32_t aScrollType, int32_t aX,
                                     int32_t aY) {
  Unused << mDoc->SendScrollToPoint(mID, aScrollType, aX, aY);
}

#if !defined(XP_WIN)
void RemoteAccessible::Announce(const nsString& aAnnouncement,
                                uint16_t aPriority) {
  Unused << mDoc->SendAnnounce(mID, aAnnouncement, aPriority);
}
#endif  // !defined(XP_WIN)

void RemoteAccessible::ScrollSubstringToPoint(int32_t aStartOffset,
                                              int32_t aEndOffset,
                                              uint32_t aCoordinateType,
                                              int32_t aX, int32_t aY) {
  Unused << mDoc->SendScrollSubstringToPoint(mID, aStartOffset, aEndOffset,
                                             aCoordinateType, aX, aY);
}

RefPtr<const AccAttributes> RemoteAccessible::GetCachedTextAttributes() {
  MOZ_ASSERT(IsText() || IsHyperText());
  if (mCachedFields) {
    auto attrs = mCachedFields->GetAttributeRefPtr<AccAttributes>(
        CacheKey::TextAttributes);
    VERIFY_CACHE(CacheDomain::Text);
    return attrs;
  }
  return nullptr;
}

already_AddRefed<AccAttributes> RemoteAccessible::DefaultTextAttributes() {
  RefPtr<const AccAttributes> attrs = GetCachedTextAttributes();
  RefPtr<AccAttributes> result = new AccAttributes();
  if (attrs) {
    attrs->CopyTo(result);
  }
  return result.forget();
}

RefPtr<const AccAttributes> RemoteAccessible::GetCachedARIAAttributes() const {
  if (mCachedFields) {
    auto attrs = mCachedFields->GetAttributeRefPtr<AccAttributes>(
        CacheKey::ARIAAttributes);
    VERIFY_CACHE(CacheDomain::ARIA);
    return attrs;
  }
  return nullptr;
}

nsString RemoteAccessible::GetCachedHTMLNameAttribute() const {
  if (mCachedFields) {
    if (auto maybeName =
            mCachedFields->GetAttribute<nsString>(CacheKey::DOMName)) {
      return *maybeName;
    }
  }
  return nsString();
}

uint64_t RemoteAccessible::State() {
  uint64_t state = 0;
  if (mCachedFields) {
    if (auto rawState =
            mCachedFields->GetAttribute<uint64_t>(CacheKey::State)) {
      VERIFY_CACHE(CacheDomain::State);
      state = *rawState;
      // Handle states that are derived from other states.
      if (!(state & states::UNAVAILABLE)) {
        state |= states::ENABLED | states::SENSITIVE;
      }
      if (state & states::EXPANDABLE && !(state & states::EXPANDED)) {
        state |= states::COLLAPSED;
      }
    }

    ApplyImplicitState(state);

    auto* cbc = mDoc->GetBrowsingContext();
    if (cbc && !cbc->IsActive()) {
      // If our browsing context is _not_ active, we're in a background tab
      // and inherently offscreen.
      state |= states::OFFSCREEN;
    } else {
      // If we're in an active browsing context, there are a few scenarios we
      // need to address:
      // - We are an iframe document in the visual viewport
      // - We are an iframe document out of the visual viewport
      // - We are non-iframe content in the visual viewport
      // - We are non-iframe content out of the visual viewport
      // We assume top level tab docs are on screen if their BC is active, so
      // we don't need additional handling for them here.
      if (!mDoc->IsTopLevel()) {
        // Here we handle iframes and iframe content.
        // We use an iframe's outer doc's position in the embedding document's
        // viewport to determine if the iframe has been scrolled offscreen.
        Accessible* docParent = mDoc->Parent();
        // In rare cases, we might not have an outer doc yet. Return if that's
        // the case.
        if (NS_WARN_IF(!docParent || !docParent->IsRemote())) {
          return state;
        }

        RemoteAccessible* outerDoc = docParent->AsRemote();
        DocAccessibleParent* embeddingDocument = outerDoc->Document();
        if (embeddingDocument &&
            !embeddingDocument->mOnScreenAccessibles.Contains(outerDoc->ID())) {
          // Our embedding document's viewport cache doesn't contain the ID of
          // our outer doc, so this iframe (and any of its content) is
          // offscreen.
          state |= states::OFFSCREEN;
        } else if (this != mDoc && !mDoc->mOnScreenAccessibles.Contains(ID())) {
          // Our embedding document's viewport cache contains the ID of our
          // outer doc, but the iframe's viewport cache doesn't contain our ID.
          // We are offscreen.
          state |= states::OFFSCREEN;
        }
      } else if (this != mDoc && !mDoc->mOnScreenAccessibles.Contains(ID())) {
        // We are top level tab content (but not a top level tab doc).
        // If our tab doc's viewport cache doesn't contain our ID, we're
        // offscreen.
        state |= states::OFFSCREEN;
      }
    }
  }

  return state;
}

already_AddRefed<AccAttributes> RemoteAccessible::Attributes() {
  RefPtr<AccAttributes> attributes = new AccAttributes();
  nsAccessibilityService* accService = GetAccService();
  if (!accService) {
    // The service can be shut down before RemoteAccessibles. If it is shut
    // down, we can't calculate some attributes. We're about to die anyway.
    return attributes.forget();
  }

  if (mCachedFields) {
    // We use GetAttribute instead of GetAttributeRefPtr because we need
    // nsAtom, not const nsAtom.
    if (auto tag =
            mCachedFields->GetAttribute<RefPtr<nsAtom>>(CacheKey::TagName)) {
      attributes->SetAttribute(nsGkAtoms::tag, *tag);
    }

    GroupPos groupPos = GroupPosition();
    nsAccUtils::SetAccGroupAttrs(attributes, groupPos.level, groupPos.setSize,
                                 groupPos.posInSet);

    bool hierarchical = false;
    uint32_t itemCount = AccGroupInfo::TotalItemCount(this, &hierarchical);
    if (itemCount) {
      attributes->SetAttribute(nsGkAtoms::child_item_count,
                               static_cast<int32_t>(itemCount));
    }

    if (hierarchical) {
      attributes->SetAttribute(nsGkAtoms::tree, true);
    }

    if (auto inputType =
            mCachedFields->GetAttribute<RefPtr<nsAtom>>(CacheKey::InputType)) {
      attributes->SetAttribute(nsGkAtoms::textInputType, *inputType);
    }

    if (RefPtr<nsAtom> display = DisplayStyle()) {
      attributes->SetAttribute(nsGkAtoms::display, display);
    }

    if (TableCellAccessible* cell = AsTableCell()) {
      TableAccessible* table = cell->Table();
      uint32_t row = cell->RowIdx();
      uint32_t col = cell->ColIdx();
      int32_t cellIdx = table->CellIndexAt(row, col);
      if (cellIdx != -1) {
        attributes->SetAttribute(nsGkAtoms::tableCellIndex, cellIdx);
      }
    }

    if (bool layoutGuess = TableIsProbablyForLayout()) {
      attributes->SetAttribute(nsGkAtoms::layout_guess, layoutGuess);
    }

    accService->MarkupAttributes(this, attributes);

    const nsRoleMapEntry* roleMap = ARIARoleMap();
    nsAutoString role;
    mCachedFields->GetAttribute(CacheKey::ARIARole, role);
    if (role.IsEmpty()) {
      if (roleMap && roleMap->roleAtom != nsGkAtoms::_empty) {
        // Single, known role.
        attributes->SetAttribute(nsGkAtoms::xmlroles, roleMap->roleAtom);
      } else if (nsAtom* landmark = LandmarkRole()) {
        // Landmark role from markup; e.g. HTML <main>.
        attributes->SetAttribute(nsGkAtoms::xmlroles, landmark);
      }
    } else {
      // Unknown role or multiple roles.
      attributes->SetAttribute(nsGkAtoms::xmlroles, std::move(role));
    }

    if (roleMap) {
      nsAutoString live;
      if (nsAccUtils::GetLiveAttrValue(roleMap->liveAttRule, live)) {
        attributes->SetAttribute(nsGkAtoms::aria_live, std::move(live));
      }
    }

    if (auto ariaAttrs = GetCachedARIAAttributes()) {
      ariaAttrs->CopyTo(attributes);
    }

    nsAccUtils::SetLiveContainerAttributes(attributes, this);

    nsString id;
    DOMNodeID(id);
    if (!id.IsEmpty()) {
      attributes->SetAttribute(nsGkAtoms::id, std::move(id));
    }

    nsString className;
    DOMNodeClass(className);
    if (!className.IsEmpty()) {
      attributes->SetAttribute(nsGkAtoms::_class, std::move(className));
    }

    if (IsImage()) {
      nsString src;
      mCachedFields->GetAttribute(CacheKey::SrcURL, src);
      if (!src.IsEmpty()) {
        attributes->SetAttribute(nsGkAtoms::src, std::move(src));
      }
    }

    if (IsTextField()) {
      nsString placeholder;
      mCachedFields->GetAttribute(CacheKey::HTMLPlaceholder, placeholder);
      if (!placeholder.IsEmpty()) {
        attributes->SetAttribute(nsGkAtoms::placeholder,
                                 std::move(placeholder));
        attributes->Remove(nsGkAtoms::aria_placeholder);
      }
    }

    nsString popupType;
    mCachedFields->GetAttribute(CacheKey::PopupType, popupType);
    if (!popupType.IsEmpty()) {
      attributes->SetAttribute(nsGkAtoms::ispopup, std::move(popupType));
    }
  }

  nsAutoString name;
  if (Name(name) != eNameFromSubtree && !name.IsVoid()) {
    attributes->SetAttribute(nsGkAtoms::explicit_name, true);
  }

  // Expose the string value via the valuetext attribute. We test for the value
  // interface because we don't want to expose traditional Value() information
  // such as URLs on links and documents, or text in an input.
  // XXX This is only needed for ATK, since other APIs have native ways to
  // retrieve value text. We should probably move this into ATK specific code.
  // For now, we do this because LocalAccessible does it.
  if (HasNumericValue()) {
    nsString valuetext;
    Value(valuetext);
    attributes->SetAttribute(nsGkAtoms::aria_valuetext, std::move(valuetext));
  }

  return attributes.forget();
}

nsAtom* RemoteAccessible::TagName() const {
  if (mCachedFields) {
    if (auto tag =
            mCachedFields->GetAttribute<RefPtr<nsAtom>>(CacheKey::TagName)) {
      return *tag;
    }
  }

  return nullptr;
}

already_AddRefed<nsAtom> RemoteAccessible::InputType() const {
  if (mCachedFields) {
    if (auto inputType =
            mCachedFields->GetAttribute<RefPtr<nsAtom>>(CacheKey::InputType)) {
      RefPtr<nsAtom> result = *inputType;
      return result.forget();
    }
  }

  return nullptr;
}

already_AddRefed<nsAtom> RemoteAccessible::DisplayStyle() const {
  if (mCachedFields) {
    if (auto display =
            mCachedFields->GetAttribute<RefPtr<nsAtom>>(CacheKey::CSSDisplay)) {
      RefPtr<nsAtom> result = *display;
      return result.forget();
    }
  }
  return nullptr;
}

float RemoteAccessible::Opacity() const {
  if (mCachedFields) {
    if (auto opacity = mCachedFields->GetAttribute<float>(CacheKey::Opacity)) {
      return *opacity;
    }
  }

  return 1.0f;
}

void RemoteAccessible::LiveRegionAttributes(nsAString* aLive,
                                            nsAString* aRelevant,
                                            Maybe<bool>* aAtomic,
                                            nsAString* aBusy) const {
  if (!mCachedFields) {
    return;
  }
  RefPtr<const AccAttributes> attrs = GetCachedARIAAttributes();
  if (!attrs) {
    return;
  }
  if (aLive) {
    attrs->GetAttribute(nsGkAtoms::aria_live, *aLive);
  }
  if (aRelevant) {
    attrs->GetAttribute(nsGkAtoms::aria_relevant, *aRelevant);
  }
  if (aAtomic) {
    if (auto value =
            attrs->GetAttribute<RefPtr<nsAtom>>(nsGkAtoms::aria_atomic)) {
      *aAtomic = Some(*value == nsGkAtoms::_true);
    }
  }
  if (aBusy) {
    attrs->GetAttribute(nsGkAtoms::aria_busy, *aBusy);
  }
}

Maybe<bool> RemoteAccessible::ARIASelected() const {
  if (mCachedFields) {
    return mCachedFields->GetAttribute<bool>(CacheKey::ARIASelected);
  }
  return Nothing();
}

nsAtom* RemoteAccessible::GetPrimaryAction() const {
  if (mCachedFields) {
    if (auto action = mCachedFields->GetAttribute<RefPtr<nsAtom>>(
            CacheKey::PrimaryAction)) {
      return *action;
    }
  }

  return nullptr;
}

uint8_t RemoteAccessible::ActionCount() const {
  uint8_t actionCount = 0;
  if (mCachedFields) {
    if (HasPrimaryAction() || ActionAncestor()) {
      actionCount++;
    }

    if (mCachedFields->HasAttribute(CacheKey::HasLongdesc)) {
      actionCount++;
    }
    VERIFY_CACHE(CacheDomain::Actions);
  }

  return actionCount;
}

void RemoteAccessible::ActionNameAt(uint8_t aIndex, nsAString& aName) {
  if (mCachedFields) {
    aName.Truncate();
    nsAtom* action = GetPrimaryAction();
    bool hasActionAncestor = !action && ActionAncestor();

    switch (aIndex) {
      case 0:
        if (action) {
          action->ToString(aName);
        } else if (hasActionAncestor) {
          aName.AssignLiteral("click ancestor");
        } else if (mCachedFields->HasAttribute(CacheKey::HasLongdesc)) {
          aName.AssignLiteral("showlongdesc");
        }
        break;
      case 1:
        if ((action || hasActionAncestor) &&
            mCachedFields->HasAttribute(CacheKey::HasLongdesc)) {
          aName.AssignLiteral("showlongdesc");
        }
        break;
      default:
        break;
    }
  }
  VERIFY_CACHE(CacheDomain::Actions);
}

bool RemoteAccessible::DoAction(uint8_t aIndex) const {
  if (ActionCount() < aIndex + 1) {
    return false;
  }

  Unused << mDoc->SendDoActionAsync(mID, aIndex);
  return true;
}

KeyBinding RemoteAccessible::AccessKey() const {
  if (mCachedFields) {
    if (auto value =
            mCachedFields->GetAttribute<uint64_t>(CacheKey::AccessKey)) {
      return KeyBinding(*value);
    }
  }
  return KeyBinding();
}

void RemoteAccessible::SelectionRanges(nsTArray<TextRange>* aRanges) const {
  Document()->SelectionRanges(aRanges);
}

bool RemoteAccessible::RemoveFromSelection(int32_t aSelectionNum) {
  MOZ_ASSERT(IsHyperText());
  if (SelectionCount() <= aSelectionNum) {
    return false;
  }

  Unused << mDoc->SendRemoveTextSelection(mID, aSelectionNum);

  return true;
}

void RemoteAccessible::ARIAGroupPosition(int32_t* aLevel, int32_t* aSetSize,
                                         int32_t* aPosInSet) const {
  if (!mCachedFields) {
    return;
  }

  if (aLevel) {
    if (auto level =
            mCachedFields->GetAttribute<int32_t>(nsGkAtoms::aria_level)) {
      *aLevel = *level;
    }
  }
  if (aSetSize) {
    if (auto setsize =
            mCachedFields->GetAttribute<int32_t>(nsGkAtoms::aria_setsize)) {
      *aSetSize = *setsize;
    }
  }
  if (aPosInSet) {
    if (auto posinset =
            mCachedFields->GetAttribute<int32_t>(nsGkAtoms::aria_posinset)) {
      *aPosInSet = *posinset;
    }
  }
}

AccGroupInfo* RemoteAccessible::GetGroupInfo() const {
  if (!mCachedFields) {
    return nullptr;
  }

  if (auto groupInfo = mCachedFields->GetAttribute<UniquePtr<AccGroupInfo>>(
          CacheKey::GroupInfo)) {
    return groupInfo->get();
  }

  return nullptr;
}

AccGroupInfo* RemoteAccessible::GetOrCreateGroupInfo() {
  AccGroupInfo* groupInfo = GetGroupInfo();
  if (groupInfo) {
    return groupInfo;
  }

  groupInfo = AccGroupInfo::CreateGroupInfo(this);
  if (groupInfo) {
    if (!mCachedFields) {
      mCachedFields = new AccAttributes();
    }

    mCachedFields->SetAttribute(CacheKey::GroupInfo, groupInfo);
  }

  return groupInfo;
}

void RemoteAccessible::InvalidateGroupInfo() {
  if (mCachedFields) {
    mCachedFields->Remove(CacheKey::GroupInfo);
  }
}

void RemoteAccessible::GetPositionAndSetSize(int32_t* aPosInSet,
                                             int32_t* aSetSize) {
  if (IsHTMLRadioButton()) {
    *aSetSize = 0;
    Relation rel = RelationByType(RelationType::MEMBER_OF);
    while (Accessible* radio = rel.Next()) {
      ++*aSetSize;
      if (radio == this) {
        *aPosInSet = *aSetSize;
      }
    }
    return;
  }

  Accessible::GetPositionAndSetSize(aPosInSet, aSetSize);
}

bool RemoteAccessible::HasPrimaryAction() const {
  return mCachedFields && mCachedFields->HasAttribute(CacheKey::PrimaryAction);
}

void RemoteAccessible::TakeFocus() const { Unused << mDoc->SendTakeFocus(mID); }

void RemoteAccessible::ScrollTo(uint32_t aHow) const {
  Unused << mDoc->SendScrollTo(mID, aHow);
}

////////////////////////////////////////////////////////////////////////////////
// SelectAccessible

void RemoteAccessible::SelectedItems(nsTArray<Accessible*>* aItems) {
  Pivot p = Pivot(this);
  PivotStateRule rule(states::SELECTED);
  for (Accessible* selected = p.First(rule); selected;
       selected = p.Next(selected, rule)) {
    aItems->AppendElement(selected);
  }
}

uint32_t RemoteAccessible::SelectedItemCount() {
  uint32_t count = 0;
  Pivot p = Pivot(this);
  PivotStateRule rule(states::SELECTED);
  for (Accessible* selected = p.First(rule); selected;
       selected = p.Next(selected, rule)) {
    count++;
  }

  return count;
}

Accessible* RemoteAccessible::GetSelectedItem(uint32_t aIndex) {
  uint32_t index = 0;
  Accessible* selected = nullptr;
  Pivot p = Pivot(this);
  PivotStateRule rule(states::SELECTED);
  for (selected = p.First(rule); selected && index < aIndex;
       selected = p.Next(selected, rule)) {
    index++;
  }

  return selected;
}

bool RemoteAccessible::IsItemSelected(uint32_t aIndex) {
  uint32_t index = 0;
  Accessible* selectable = nullptr;
  Pivot p = Pivot(this);
  PivotStateRule rule(states::SELECTABLE);
  for (selectable = p.First(rule); selectable && index < aIndex;
       selectable = p.Next(selectable, rule)) {
    index++;
  }

  return selectable && selectable->State() & states::SELECTED;
}

bool RemoteAccessible::AddItemToSelection(uint32_t aIndex) {
  uint32_t index = 0;
  Accessible* selectable = nullptr;
  Pivot p = Pivot(this);
  PivotStateRule rule(states::SELECTABLE);
  for (selectable = p.First(rule); selectable && index < aIndex;
       selectable = p.Next(selectable, rule)) {
    index++;
  }

  if (selectable) selectable->SetSelected(true);

  return static_cast<bool>(selectable);
}

bool RemoteAccessible::RemoveItemFromSelection(uint32_t aIndex) {
  uint32_t index = 0;
  Accessible* selectable = nullptr;
  Pivot p = Pivot(this);
  PivotStateRule rule(states::SELECTABLE);
  for (selectable = p.First(rule); selectable && index < aIndex;
       selectable = p.Next(selectable, rule)) {
    index++;
  }

  if (selectable) selectable->SetSelected(false);

  return static_cast<bool>(selectable);
}

bool RemoteAccessible::SelectAll() {
  if ((State() & states::MULTISELECTABLE) == 0) {
    return false;
  }

  bool success = false;
  Accessible* selectable = nullptr;
  Pivot p = Pivot(this);
  PivotStateRule rule(states::SELECTABLE);
  for (selectable = p.First(rule); selectable;
       selectable = p.Next(selectable, rule)) {
    success = true;
    selectable->SetSelected(true);
  }
  return success;
}

bool RemoteAccessible::UnselectAll() {
  if ((State() & states::MULTISELECTABLE) == 0) {
    return false;
  }

  bool success = false;
  Accessible* selectable = nullptr;
  Pivot p = Pivot(this);
  PivotStateRule rule(states::SELECTABLE);
  for (selectable = p.First(rule); selectable;
       selectable = p.Next(selectable, rule)) {
    success = true;
    selectable->SetSelected(false);
  }
  return success;
}

void RemoteAccessible::TakeSelection() {
  Unused << mDoc->SendTakeSelection(mID);
}

void RemoteAccessible::SetSelected(bool aSelect) {
  Unused << mDoc->SendSetSelected(mID, aSelect);
}

TableAccessible* RemoteAccessible::AsTable() {
  if (IsTable()) {
    return CachedTableAccessible::GetFrom(this);
  }
  return nullptr;
}

TableCellAccessible* RemoteAccessible::AsTableCell() {
  if (IsTableCell()) {
    return CachedTableCellAccessible::GetFrom(this);
  }
  return nullptr;
}

bool RemoteAccessible::TableIsProbablyForLayout() {
  if (mCachedFields) {
    if (auto layoutGuess =
            mCachedFields->GetAttribute<bool>(CacheKey::TableLayoutGuess)) {
      return *layoutGuess;
    }
  }
  return false;
}

nsTArray<int32_t>& RemoteAccessible::GetCachedHyperTextOffsets() {
  if (mCachedFields) {
    if (auto offsets = mCachedFields->GetMutableAttribute<nsTArray<int32_t>>(
            CacheKey::HyperTextOffsets)) {
      return *offsets;
    }
  }
  nsTArray<int32_t> newOffsets;
  if (!mCachedFields) {
    mCachedFields = new AccAttributes();
  }
  mCachedFields->SetAttribute(CacheKey::HyperTextOffsets,
                              std::move(newOffsets));
  return *mCachedFields->GetMutableAttribute<nsTArray<int32_t>>(
      CacheKey::HyperTextOffsets);
}

void RemoteAccessible::SetCaretOffset(int32_t aOffset) {
  Unused << mDoc->SendSetCaretOffset(mID, aOffset);
}

Maybe<int32_t> RemoteAccessible::GetIntARIAAttr(nsAtom* aAttrName) const {
  if (RefPtr<const AccAttributes> attrs = GetCachedARIAAttributes()) {
    if (auto val = attrs->GetAttribute<int32_t>(aAttrName)) {
      return val;
    }
  }
  return Nothing();
}

void RemoteAccessible::Language(nsAString& aLocale) {
  if (!IsHyperText()) {
    return;
  }
  if (auto attrs = GetCachedTextAttributes()) {
    attrs->GetAttribute(nsGkAtoms::language, aLocale);
  }
}

void RemoteAccessible::ReplaceText(const nsAString& aText) {
  Unused << mDoc->SendReplaceText(mID, aText);
}

void RemoteAccessible::InsertText(const nsAString& aText, int32_t aPosition) {
  Unused << mDoc->SendInsertText(mID, aText, aPosition);
}

void RemoteAccessible::CopyText(int32_t aStartPos, int32_t aEndPos) {
  Unused << mDoc->SendCopyText(mID, aStartPos, aEndPos);
}

void RemoteAccessible::CutText(int32_t aStartPos, int32_t aEndPos) {
  Unused << mDoc->SendCutText(mID, aStartPos, aEndPos);
}

void RemoteAccessible::DeleteText(int32_t aStartPos, int32_t aEndPos) {
  Unused << mDoc->SendDeleteText(mID, aStartPos, aEndPos);
}

void RemoteAccessible::PasteText(int32_t aPosition) {
  Unused << mDoc->SendPasteText(mID, aPosition);
}

size_t RemoteAccessible::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) {
  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}

size_t RemoteAccessible::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) {
  size_t size = 0;

  // Count attributes.
  if (mCachedFields) {
    size += mCachedFields->SizeOfIncludingThis(aMallocSizeOf);
  }

  // We don't recurse into mChildren because they're already counted in their
  // document's mAccessibles.
  size += mChildren.ShallowSizeOfExcludingThis(aMallocSizeOf);

  return size;
}

}  // namespace a11y
}  // namespace mozilla