summaryrefslogtreecommitdiff
path: root/dom/base/nsXMLContentSerializer.cpp
blob: e5cf12f63877b6ebc099d50fa8424ae5fc9da26e (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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

/*
 * nsIContentSerializer implementation that can be used with an
 * nsIDocumentEncoder to convert an XML DOM to an XML string that
 * could be parsed into more or less the original DOM.
 */

#include "nsXMLContentSerializer.h"

#include "nsGkAtoms.h"
#include "nsIDOMProcessingInstruction.h"
#include "nsIDOMComment.h"
#include "nsIDOMDocumentType.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIDocumentEncoder.h"
#include "nsElementTable.h"
#include "nsNameSpaceManager.h"
#include "nsTextFragment.h"
#include "nsString.h"
#include "mozilla/Sprintf.h"
#include "nsUnicharUtils.h"
#include "nsCRT.h"
#include "nsContentUtils.h"
#include "nsAttrName.h"
#include "nsILineBreaker.h"
#include "mozilla/dom/Element.h"
#include "nsParserConstants.h"

using namespace mozilla::dom;

#define kXMLNS "xmlns"

// to be readable, we assume that an indented line contains
// at least this number of characters (arbitrary value here).
// This is a limit for the indentation.
#define MIN_INDENTED_LINE_LENGTH 15

// the string used to indent.
#define INDENT_STRING "  "
#define INDENT_STRING_LENGTH 2

nsresult
NS_NewXMLContentSerializer(nsIContentSerializer** aSerializer)
{
  RefPtr<nsXMLContentSerializer> it = new nsXMLContentSerializer();
  it.forget(aSerializer);
  return NS_OK;
}

nsXMLContentSerializer::nsXMLContentSerializer()
  : mPrefixIndex(0),
    mColPos(0),
    mIndentOverflow(0),
    mIsIndentationAddedOnCurrentLine(false),
    mInAttribute(false),
    mAddNewlineForRootNode(false),
    mAddSpace(false),
    mMayIgnoreLineBreakSequence(false),
    mBodyOnly(false),
    mInBody(0)
{
}

nsXMLContentSerializer::~nsXMLContentSerializer()
{
}

NS_IMPL_ISUPPORTS(nsXMLContentSerializer, nsIContentSerializer)

NS_IMETHODIMP
nsXMLContentSerializer::Init(uint32_t aFlags, uint32_t aWrapColumn,
                             const char* aCharSet, bool aIsCopying,
                             bool aRewriteEncodingDeclaration)
{
  mPrefixIndex = 0;
  mColPos = 0;
  mIndentOverflow = 0;
  mIsIndentationAddedOnCurrentLine = false;
  mInAttribute = false;
  mAddNewlineForRootNode = false;
  mAddSpace = false;
  mMayIgnoreLineBreakSequence = false;
  mBodyOnly = false;
  mInBody = 0;

  mCharset = aCharSet;
  mFlags = aFlags;

  // Set the line break character:
  if ((mFlags & nsIDocumentEncoder::OutputCRLineBreak)
      && (mFlags & nsIDocumentEncoder::OutputLFLineBreak)) { // Windows
    mLineBreak.AssignLiteral("\r\n");
  }
  else if (mFlags & nsIDocumentEncoder::OutputCRLineBreak) { // Mac
    mLineBreak.Assign('\r');
  }
  else if (mFlags & nsIDocumentEncoder::OutputLFLineBreak) { // Unix/DOM
    mLineBreak.Assign('\n');
  }
  else {
    mLineBreak.AssignLiteral(NS_LINEBREAK);         // Platform/default
  }

  mDoRaw = !!(mFlags & nsIDocumentEncoder::OutputRaw);

  mDoFormat = (mFlags & nsIDocumentEncoder::OutputFormatted && !mDoRaw);

  mDoWrap = (mFlags & nsIDocumentEncoder::OutputWrap && !mDoRaw);

  mAllowLineBreaking = !(mFlags & nsIDocumentEncoder::OutputDisallowLineBreaking);

  if (!aWrapColumn) {
    mMaxColumn = 72;
  }
  else {
    mMaxColumn = aWrapColumn;
  }

  mPreLevel = 0;
  mIsIndentationAddedOnCurrentLine = false;
  return NS_OK;
}

nsresult
nsXMLContentSerializer::AppendTextData(nsIContent* aNode,
                                       int32_t aStartOffset,
                                       int32_t aEndOffset,
                                       nsAString& aStr,
                                       bool aTranslateEntities)
{
  nsIContent* content = aNode;
  const nsTextFragment* frag;
  if (!content || !(frag = content->GetText())) {
    return NS_ERROR_FAILURE;
  }

  int32_t fragLength = frag->GetLength();
  int32_t endoffset = (aEndOffset == -1) ? fragLength : std::min(aEndOffset, fragLength);
  int32_t length = endoffset - aStartOffset;

  NS_ASSERTION(aStartOffset >= 0, "Negative start offset for text fragment!");
  NS_ASSERTION(aStartOffset <= endoffset, "A start offset is beyond the end of the text fragment!");

  if (length <= 0) {
    // XXX Zero is a legal value, maybe non-zero values should be an
    // error.
    return NS_OK;
  }

  if (frag->Is2b()) {
    const char16_t *strStart = frag->Get2b() + aStartOffset;
    if (aTranslateEntities) {
      NS_ENSURE_TRUE(AppendAndTranslateEntities(Substring(strStart, strStart + length), aStr),
                     NS_ERROR_OUT_OF_MEMORY);
    }
    else {
      NS_ENSURE_TRUE(aStr.Append(Substring(strStart, strStart + length), mozilla::fallible),
                     NS_ERROR_OUT_OF_MEMORY);
    }
  }
  else {
    if (aTranslateEntities) {
      NS_ENSURE_TRUE(AppendAndTranslateEntities(NS_ConvertASCIItoUTF16(frag->Get1b()+aStartOffset, length), aStr),
                     NS_ERROR_OUT_OF_MEMORY);
    }
    else {
      NS_ENSURE_TRUE(aStr.Append(NS_ConvertASCIItoUTF16(frag->Get1b()+aStartOffset, length), mozilla::fallible),
                     NS_ERROR_OUT_OF_MEMORY);
    }
  }

  return NS_OK;
}

NS_IMETHODIMP
nsXMLContentSerializer::AppendText(nsIContent* aText,
                                   int32_t aStartOffset,
                                   int32_t aEndOffset,
                                   nsAString& aStr)
{
  NS_ENSURE_ARG(aText);

  nsAutoString data;
  nsresult rv;

  rv = AppendTextData(aText, aStartOffset, aEndOffset, data, true);
  if (NS_FAILED(rv))
    return NS_ERROR_FAILURE;

  if (mDoRaw || PreLevel() > 0) {
    NS_ENSURE_TRUE(AppendToStringConvertLF(data, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else if (mDoFormat) {
    NS_ENSURE_TRUE(AppendToStringFormatedWrapped(data, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else if (mDoWrap) {
    NS_ENSURE_TRUE(AppendToStringWrapped(data, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else {
    NS_ENSURE_TRUE(AppendToStringConvertLF(data, aStr), NS_ERROR_OUT_OF_MEMORY);
  }

  return NS_OK;
}

NS_IMETHODIMP
nsXMLContentSerializer::AppendCDATASection(nsIContent* aCDATASection,
                                           int32_t aStartOffset,
                                           int32_t aEndOffset,
                                           nsAString& aStr)
{
  NS_ENSURE_ARG(aCDATASection);
  nsresult rv;

  NS_NAMED_LITERAL_STRING(cdata , "<![CDATA[");

  if (mDoRaw || PreLevel() > 0) {
    NS_ENSURE_TRUE(AppendToString(cdata, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else if (mDoFormat) {
    NS_ENSURE_TRUE(AppendToStringFormatedWrapped(cdata, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else if (mDoWrap) {
    NS_ENSURE_TRUE(AppendToStringWrapped(cdata, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else {
    NS_ENSURE_TRUE(AppendToString(cdata, aStr), NS_ERROR_OUT_OF_MEMORY);
  }

  nsAutoString data;
  rv = AppendTextData(aCDATASection, aStartOffset, aEndOffset, data, false);
  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

  NS_ENSURE_TRUE(AppendToStringConvertLF(data, aStr), NS_ERROR_OUT_OF_MEMORY);

  NS_ENSURE_TRUE(AppendToString(NS_LITERAL_STRING("]]>"), aStr), NS_ERROR_OUT_OF_MEMORY);

  return NS_OK;
}

NS_IMETHODIMP
nsXMLContentSerializer::AppendProcessingInstruction(nsIContent* aPI,
                                                    int32_t aStartOffset,
                                                    int32_t aEndOffset,
                                                    nsAString& aStr)
{
  nsCOMPtr<nsIDOMProcessingInstruction> pi = do_QueryInterface(aPI);
  NS_ENSURE_ARG(pi);
  nsresult rv;
  nsAutoString target, data, start;

  NS_ENSURE_TRUE(MaybeAddNewlineForRootNode(aStr), NS_ERROR_OUT_OF_MEMORY);

  rv = pi->GetTarget(target);
  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

  rv = pi->GetData(data);
  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

  NS_ENSURE_TRUE(start.AppendLiteral("<?", mozilla::fallible), NS_ERROR_OUT_OF_MEMORY);
  NS_ENSURE_TRUE(start.Append(target, mozilla::fallible), NS_ERROR_OUT_OF_MEMORY);

  if (mDoRaw || PreLevel() > 0) {
    NS_ENSURE_TRUE(AppendToString(start, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else if (mDoFormat) {
    if (mAddSpace) {
      NS_ENSURE_TRUE(AppendNewLineToString(aStr), NS_ERROR_OUT_OF_MEMORY);
    }
    NS_ENSURE_TRUE(AppendToStringFormatedWrapped(start, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else if (mDoWrap) {
    NS_ENSURE_TRUE(AppendToStringWrapped(start, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else {
    NS_ENSURE_TRUE(AppendToString(start, aStr), NS_ERROR_OUT_OF_MEMORY);
  }

  if (!data.IsEmpty()) {
    NS_ENSURE_TRUE(AppendToString(char16_t(' '), aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToStringConvertLF(data, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  NS_ENSURE_TRUE(AppendToString(NS_LITERAL_STRING("?>"), aStr), NS_ERROR_OUT_OF_MEMORY);

  MaybeFlagNewlineForRootNode(aPI);

  return NS_OK;
}

NS_IMETHODIMP
nsXMLContentSerializer::AppendComment(nsIContent* aComment,
                                      int32_t aStartOffset,
                                      int32_t aEndOffset,
                                      nsAString& aStr)
{
  nsCOMPtr<nsIDOMComment> comment = do_QueryInterface(aComment);
  NS_ENSURE_ARG(comment);
  nsresult rv;
  nsAutoString data;

  rv = comment->GetData(data);
  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

  int32_t dataLength = data.Length();
  if (aStartOffset || (aEndOffset != -1 && aEndOffset < dataLength)) {
    int32_t length =
      (aEndOffset == -1) ? dataLength : std::min(aEndOffset, dataLength);
    length -= aStartOffset;

    nsAutoString frag;
    if (length > 0) {
      data.Mid(frag, aStartOffset, length);
    }
    data.Assign(frag);
  }

  NS_ENSURE_TRUE(MaybeAddNewlineForRootNode(aStr), NS_ERROR_OUT_OF_MEMORY);

  NS_NAMED_LITERAL_STRING(startComment, "<!--");

  if (mDoRaw || PreLevel() > 0) {
    NS_ENSURE_TRUE(AppendToString(startComment, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else if (mDoFormat) {
    if (mAddSpace) {
      NS_ENSURE_TRUE(AppendNewLineToString(aStr), NS_ERROR_OUT_OF_MEMORY);
    }
    NS_ENSURE_TRUE(AppendToStringFormatedWrapped(startComment, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else if (mDoWrap) {
    NS_ENSURE_TRUE(AppendToStringWrapped(startComment, aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else {
    NS_ENSURE_TRUE(AppendToString(startComment, aStr), NS_ERROR_OUT_OF_MEMORY);
  }

  // Even if mDoformat, we don't format the content because it
  // could have been preformated by the author
  NS_ENSURE_TRUE(AppendToStringConvertLF(data, aStr), NS_ERROR_OUT_OF_MEMORY);
  NS_ENSURE_TRUE(AppendToString(NS_LITERAL_STRING("-->"), aStr), NS_ERROR_OUT_OF_MEMORY);

  MaybeFlagNewlineForRootNode(aComment);

  return NS_OK;
}

NS_IMETHODIMP
nsXMLContentSerializer::AppendDoctype(nsIContent* aDocType,
                                      nsAString& aStr)
{
  nsCOMPtr<nsIDOMDocumentType> docType = do_QueryInterface(aDocType);
  NS_ENSURE_ARG(docType);
  nsresult rv;
  nsAutoString name, publicId, systemId, internalSubset;

  rv = docType->GetName(name);
  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
  rv = docType->GetPublicId(publicId);
  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
  rv = docType->GetSystemId(systemId);
  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
  rv = docType->GetInternalSubset(internalSubset);
  if (NS_FAILED(rv)) return NS_ERROR_FAILURE;

  NS_ENSURE_TRUE(MaybeAddNewlineForRootNode(aStr), NS_ERROR_OUT_OF_MEMORY);

  NS_ENSURE_TRUE(AppendToString(NS_LITERAL_STRING("<!DOCTYPE "), aStr), NS_ERROR_OUT_OF_MEMORY);
  NS_ENSURE_TRUE(AppendToString(name, aStr), NS_ERROR_OUT_OF_MEMORY);

  char16_t quote;
  if (!publicId.IsEmpty()) {
    NS_ENSURE_TRUE(AppendToString(NS_LITERAL_STRING(" PUBLIC "), aStr), NS_ERROR_OUT_OF_MEMORY);
    if (publicId.FindChar(char16_t('"')) == -1) {
      quote = char16_t('"');
    }
    else {
      quote = char16_t('\'');
    }
    NS_ENSURE_TRUE(AppendToString(quote, aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToString(publicId, aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToString(quote, aStr), NS_ERROR_OUT_OF_MEMORY);

    if (!systemId.IsEmpty()) {
      NS_ENSURE_TRUE(AppendToString(char16_t(' '), aStr), NS_ERROR_OUT_OF_MEMORY);
      if (systemId.FindChar(char16_t('"')) == -1) {
        quote = char16_t('"');
      }
      else {
        quote = char16_t('\'');
      }
      NS_ENSURE_TRUE(AppendToString(quote, aStr), NS_ERROR_OUT_OF_MEMORY);
      NS_ENSURE_TRUE(AppendToString(systemId, aStr), NS_ERROR_OUT_OF_MEMORY);
      NS_ENSURE_TRUE(AppendToString(quote, aStr), NS_ERROR_OUT_OF_MEMORY);
    }
  }
  else if (!systemId.IsEmpty()) {
    if (systemId.FindChar(char16_t('"')) == -1) {
      quote = char16_t('"');
    }
    else {
      quote = char16_t('\'');
    }
    NS_ENSURE_TRUE(AppendToString(NS_LITERAL_STRING(" SYSTEM "), aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToString(quote, aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToString(systemId, aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToString(quote, aStr), NS_ERROR_OUT_OF_MEMORY);
  }

  if (!internalSubset.IsEmpty()) {
    NS_ENSURE_TRUE(AppendToString(NS_LITERAL_STRING(" ["), aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToString(internalSubset, aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToString(char16_t(']'), aStr), NS_ERROR_OUT_OF_MEMORY);
  }

  NS_ENSURE_TRUE(AppendToString(kGreaterThan, aStr), NS_ERROR_OUT_OF_MEMORY);
  MaybeFlagNewlineForRootNode(aDocType);

  return NS_OK;
}

nsresult
nsXMLContentSerializer::PushNameSpaceDecl(const nsAString& aPrefix,
                                          const nsAString& aURI,
                                          nsIContent* aOwner)
{
  NameSpaceDecl* decl = mNameSpaceStack.AppendElement();
  if (!decl) return NS_ERROR_OUT_OF_MEMORY;

  decl->mPrefix.Assign(aPrefix);
  decl->mURI.Assign(aURI);
  // Don't addref - this weak reference will be removed when
  // we pop the stack
  decl->mOwner = aOwner;
  return NS_OK;
}

void
nsXMLContentSerializer::PopNameSpaceDeclsFor(nsIContent* aOwner)
{
  int32_t index, count;

  count = mNameSpaceStack.Length();
  for (index = count - 1; index >= 0; index--) {
    if (mNameSpaceStack[index].mOwner != aOwner) {
      break;
    }
    mNameSpaceStack.RemoveElementAt(index);
  }
}

bool
nsXMLContentSerializer::ConfirmPrefix(nsAString& aPrefix,
                                      const nsAString& aURI,
                                      nsIContent* aElement,
                                      bool aIsAttribute)
{
  if (aPrefix.EqualsLiteral(kXMLNS)) {
    return false;
  }

  if (aURI.EqualsLiteral("http://www.w3.org/XML/1998/namespace")) {
    // The prefix must be xml for this namespace. We don't need to declare it,
    // so always just set the prefix to xml.
    aPrefix.AssignLiteral("xml");

    return false;
  }

  bool mustHavePrefix;
  if (aIsAttribute) {
    if (aURI.IsEmpty()) {
      // Attribute in the null namespace.  This just shouldn't have a prefix.
      // And there's no need to push any namespace decls
      aPrefix.Truncate();
      return false;
    }

    // Attribute not in the null namespace -- must have a prefix
    mustHavePrefix = true;
  } else {
    // Not an attribute, so doesn't _have_ to have a prefix
    mustHavePrefix = false;
  }

  // Keep track of the closest prefix that's bound to aURI and whether we've
  // found such a thing.  closestURIMatch holds the prefix, and uriMatch
  // indicates whether we actually have one.
  nsAutoString closestURIMatch;
  bool uriMatch = false;

  // Also keep track of whether we've seen aPrefix already.  If we have, that
  // means that it's already bound to a URI different from aURI, so even if we
  // later (so in a more outer scope) see it bound to aURI we can't reuse it.
  bool haveSeenOurPrefix = false;

  int32_t count = mNameSpaceStack.Length();
  int32_t index = count - 1;
  while (index >= 0) {
    NameSpaceDecl& decl = mNameSpaceStack.ElementAt(index);
    // Check if we've found a prefix match
    if (aPrefix.Equals(decl.mPrefix)) {

      // If the URIs match and aPrefix is not bound to any other URI, we can
      // use aPrefix
      if (!haveSeenOurPrefix && aURI.Equals(decl.mURI)) {
        // Just use our uriMatch stuff.  That will deal with an empty aPrefix
        // the right way.  We can break out of the loop now, though.
        uriMatch = true;
        closestURIMatch = aPrefix;
        break;
      }

      haveSeenOurPrefix = true;

      // If they don't, and either:
      // 1) We have a prefix (so we'd be redeclaring this prefix to point to a
      //    different namespace) or
      // 2) We're looking at an existing default namespace decl on aElement (so
      //    we can't create a new default namespace decl for this URI)
      // then generate a new prefix.  Note that we do NOT generate new prefixes
      // if we happen to have aPrefix == decl->mPrefix == "" and mismatching
      // URIs when |decl| doesn't have aElement as its owner.  In that case we
      // can simply push the new namespace URI as the default namespace for
      // aElement.
      if (!aPrefix.IsEmpty() || decl.mOwner == aElement) {
        NS_ASSERTION(!aURI.IsEmpty(),
                     "Not allowed to add a xmlns attribute with an empty "
                     "namespace name unless it declares the default "
                     "namespace.");

        GenerateNewPrefix(aPrefix);
        // Now we need to validate our new prefix/uri combination; check it
        // against the full namespace stack again.  Note that just restarting
        // the while loop is ok, since we haven't changed aURI, so the
        // closestURIMatch and uriMatch state is not affected.
        index = count - 1;
        haveSeenOurPrefix = false;
        continue;
      }
    }

    // If we've found a URI match, then record the first one
    if (!uriMatch && aURI.Equals(decl.mURI)) {
      // Need to check that decl->mPrefix is not declared anywhere closer to
      // us.  If it is, we can't use it.
      bool prefixOK = true;
      int32_t index2;
      for (index2 = count-1; index2 > index && prefixOK; --index2) {
        prefixOK = (mNameSpaceStack[index2].mPrefix != decl.mPrefix);
      }

      if (prefixOK) {
        uriMatch = true;
        closestURIMatch.Assign(decl.mPrefix);
      }
    }

    --index;
  }

  // At this point the following invariants hold:
  // 1) The prefix in closestURIMatch is mapped to aURI in our scope if
  //    uriMatch is set.
  // 2) There is nothing on the namespace stack that has aPrefix as the prefix
  //    and a _different_ URI, except for the case aPrefix.IsEmpty (and
  //    possible default namespaces on ancestors)

  // So if uriMatch is set it's OK to use the closestURIMatch prefix.  The one
  // exception is when closestURIMatch is actually empty (default namespace
  // decl) and we must have a prefix.
  if (uriMatch && (!mustHavePrefix || !closestURIMatch.IsEmpty())) {
    aPrefix.Assign(closestURIMatch);
    return false;
  }

  if (aPrefix.IsEmpty()) {
    // At this point, aPrefix is empty (which means we never had a prefix to
    // start with).  If we must have a prefix, just generate a new prefix and
    // then send it back through the namespace stack checks to make sure it's
    // OK.
    if (mustHavePrefix) {
      GenerateNewPrefix(aPrefix);
      return ConfirmPrefix(aPrefix, aURI, aElement, aIsAttribute);
    }

    // One final special case.  If aPrefix is empty and we never saw an empty
    // prefix (default namespace decl) on the namespace stack and we're in the
    // null namespace there is no reason to output an |xmlns=""| here.  It just
    // makes the output less readable.
    if (!haveSeenOurPrefix && aURI.IsEmpty()) {
      return false;
    }
  }

  // Now just set aURI as the new default namespace URI.  Indicate that we need
  // to create a namespace decl for the final prefix
  return true;
}

void
nsXMLContentSerializer::GenerateNewPrefix(nsAString& aPrefix)
{
  aPrefix.Assign('a');
  char buf[128];
  SprintfLiteral(buf, "%d", mPrefixIndex++);
  AppendASCIItoUTF16(buf, aPrefix);
}

bool
nsXMLContentSerializer::SerializeAttr(const nsAString& aPrefix,
                                      const nsAString& aName,
                                      const nsAString& aValue,
                                      nsAString& aStr,
                                      bool aDoEscapeEntities)
{
  nsAutoString attrString_;
  // For innerHTML we can do faster appending without
  // temporary strings.
  bool rawAppend = mDoRaw && aDoEscapeEntities;
  nsAString& attrString = (rawAppend) ? aStr : attrString_;

  NS_ENSURE_TRUE(attrString.Append(char16_t(' '), mozilla::fallible), false);
  if (!aPrefix.IsEmpty()) {
    NS_ENSURE_TRUE(attrString.Append(aPrefix, mozilla::fallible), false);
    NS_ENSURE_TRUE(attrString.Append(char16_t(':'), mozilla::fallible), false);
  }
  NS_ENSURE_TRUE(attrString.Append(aName, mozilla::fallible), false);

  if (aDoEscapeEntities) {
    // if problem characters are turned into character entity references
    // then there will be no problem with the value delimiter characters
    NS_ENSURE_TRUE(attrString.AppendLiteral("=\"", mozilla::fallible), false);

    mInAttribute = true;
    bool result = AppendAndTranslateEntities(aValue, attrString);
    mInAttribute = false;
    NS_ENSURE_TRUE(result, false);

    NS_ENSURE_TRUE(attrString.Append(char16_t('"'), mozilla::fallible), false);
    if (rawAppend) {
      return true;
    }
  }
  else {
    // Depending on whether the attribute value contains quotes or apostrophes we
    // need to select the delimiter character and escape characters using
    // character entity references, ignoring the value of aDoEscapeEntities.
    // See http://www.w3.org/TR/REC-html40/appendix/notes.html#h-B.3.2.2 for
    // the standard on character entity references in values.  We also have to
    // make sure to escape any '&' characters.

    bool bIncludesSingle = false;
    bool bIncludesDouble = false;
    nsAString::const_iterator iCurr, iEnd;
    aValue.BeginReading(iCurr);
    aValue.EndReading(iEnd);
    for ( ; iCurr != iEnd; ++iCurr) {
      if (*iCurr == char16_t('\'')) {
        bIncludesSingle = true;
        if (bIncludesDouble) {
          break;
        }
      } else if (*iCurr == char16_t('"')) {
        bIncludesDouble = true;
        if (bIncludesSingle) {
          break;
        }
      }
    }

    // Delimiter and escaping is according to the following table
    //    bIncludesDouble     bIncludesSingle     Delimiter       Escape Double Quote
    //    FALSE               FALSE               "               FALSE
    //    FALSE               TRUE                "               FALSE
    //    TRUE                FALSE               '               FALSE
    //    TRUE                TRUE                "               TRUE
    char16_t cDelimiter =
        (bIncludesDouble && !bIncludesSingle) ? char16_t('\'') : char16_t('"');
    NS_ENSURE_TRUE(attrString.Append(char16_t('='), mozilla::fallible), false);
    NS_ENSURE_TRUE(attrString.Append(cDelimiter, mozilla::fallible), false);
    nsAutoString sValue(aValue);
    NS_ENSURE_TRUE(sValue.ReplaceSubstring(NS_LITERAL_STRING("&"),
                                           NS_LITERAL_STRING("&amp;"), mozilla::fallible), false);
    if (bIncludesDouble && bIncludesSingle) {
      NS_ENSURE_TRUE(sValue.ReplaceSubstring(NS_LITERAL_STRING("\""),
                                             NS_LITERAL_STRING("&quot;"), mozilla::fallible), false);
    }
    NS_ENSURE_TRUE(attrString.Append(sValue, mozilla::fallible), false);
    NS_ENSURE_TRUE(attrString.Append(cDelimiter, mozilla::fallible), false);
  }
  if (mDoRaw || PreLevel() > 0) {
    NS_ENSURE_TRUE(AppendToStringConvertLF(attrString, aStr), false);
  }
  else if (mDoFormat) {
    NS_ENSURE_TRUE(AppendToStringFormatedWrapped(attrString, aStr), false);
  }
  else if (mDoWrap) {
    NS_ENSURE_TRUE(AppendToStringWrapped(attrString, aStr), false);
  }
  else {
    NS_ENSURE_TRUE(AppendToStringConvertLF(attrString, aStr), false);
  }

  return true;
}

uint32_t
nsXMLContentSerializer::ScanNamespaceDeclarations(nsIContent* aContent,
                                                  nsIContent *aOriginalElement,
                                                  const nsAString& aTagNamespaceURI)
{
  uint32_t index, count;
  nsAutoString uriStr, valueStr;

  count = aContent->GetAttrCount();

  // First scan for namespace declarations, pushing each on the stack
  uint32_t skipAttr = count;
  for (index = 0; index < count; index++) {

    const BorrowedAttrInfo info = aContent->GetAttrInfoAt(index);
    const nsAttrName* name = info.mName;

    int32_t namespaceID = name->NamespaceID();
    nsIAtom *attrName = name->LocalName();

    if (namespaceID == kNameSpaceID_XMLNS ||
        // Also push on the stack attrs named "xmlns" in the null
        // namespace... because once we serialize those out they'll look like
        // namespace decls.  :(
        // XXXbz what if we have both "xmlns" in the null namespace and "xmlns"
        // in the xmlns namespace?
        (namespaceID == kNameSpaceID_None &&
         attrName == nsGkAtoms::xmlns)) {
      info.mValue->ToString(uriStr);

      if (!name->GetPrefix()) {
        if (aTagNamespaceURI.IsEmpty() && !uriStr.IsEmpty()) {
          // If the element is in no namespace we need to add a xmlns
          // attribute to declare that. That xmlns attribute must not have a
          // prefix (see http://www.w3.org/TR/REC-xml-names/#dt-prefix), ie it
          // must declare the default namespace. We just found an xmlns
          // attribute that declares the default namespace to something
          // non-empty. We're going to ignore this attribute, for children we
          // will detect that we need to add it again and attributes aren't
          // affected by the default namespace.
          skipAttr = index;
        }
        else {
          // Default NS attribute does not have prefix (and the name is "xmlns")
          PushNameSpaceDecl(EmptyString(), uriStr, aOriginalElement);
        }
      }
      else {
        PushNameSpaceDecl(nsDependentAtomString(attrName), uriStr,
                          aOriginalElement);
      }
    }
  }
  return skipAttr;
}


bool
nsXMLContentSerializer::IsJavaScript(nsIContent * aContent, nsIAtom* aAttrNameAtom,
                                     int32_t aAttrNamespaceID, const nsAString& aValueString)
{
  bool isHtml = aContent->IsHTMLElement();
  bool isXul = aContent->IsXULElement();
  bool isSvg = aContent->IsSVGElement();

  if (aAttrNamespaceID == kNameSpaceID_None &&
      (isHtml || isXul || isSvg) &&
      (aAttrNameAtom == nsGkAtoms::href ||
       aAttrNameAtom == nsGkAtoms::src)) {

    static const char kJavaScript[] = "javascript";
    int32_t pos = aValueString.FindChar(':');
    if (pos < (int32_t)(sizeof kJavaScript - 1))
        return false;
    nsAutoString scheme(Substring(aValueString, 0, pos));
    scheme.StripWhitespace();
    if ((scheme.Length() == (sizeof kJavaScript - 1)) &&
        scheme.EqualsIgnoreCase(kJavaScript))
      return true;
    else
      return false;
  }

  return aContent->IsEventAttributeName(aAttrNameAtom);
}


bool
nsXMLContentSerializer::SerializeAttributes(nsIContent* aContent,
                                            nsIContent *aOriginalElement,
                                            nsAString& aTagPrefix,
                                            const nsAString& aTagNamespaceURI,
                                            nsIAtom* aTagName,
                                            nsAString& aStr,
                                            uint32_t aSkipAttr,
                                            bool aAddNSAttr)
{

  nsAutoString prefixStr, uriStr, valueStr;
  nsAutoString xmlnsStr;
  xmlnsStr.AssignLiteral(kXMLNS);
  uint32_t index, count;

  // If we had to add a new namespace declaration, serialize
  // and push it on the namespace stack
  if (aAddNSAttr) {
    if (aTagPrefix.IsEmpty()) {
      // Serialize default namespace decl
      NS_ENSURE_TRUE(SerializeAttr(EmptyString(), xmlnsStr, aTagNamespaceURI, aStr, true), false);
    }
    else {
      // Serialize namespace decl
      NS_ENSURE_TRUE(SerializeAttr(xmlnsStr, aTagPrefix, aTagNamespaceURI, aStr, true), false);
    }
    PushNameSpaceDecl(aTagPrefix, aTagNamespaceURI, aOriginalElement);
  }

  count = aContent->GetAttrCount();

  // Now serialize each of the attributes
  // XXX Unfortunately we need a namespace manager to get
  // attribute URIs.
  for (index = 0; index < count; index++) {
    if (aSkipAttr == index) {
        continue;
    }

    const nsAttrName* name = aContent->GetAttrNameAt(index);
    int32_t namespaceID = name->NamespaceID();
    nsIAtom* attrName = name->LocalName();
    nsIAtom* attrPrefix = name->GetPrefix();

    // Filter out any attribute starting with [-|_]moz
    nsDependentAtomString attrNameStr(attrName);
    if (StringBeginsWith(attrNameStr, NS_LITERAL_STRING("_moz")) ||
        StringBeginsWith(attrNameStr, NS_LITERAL_STRING("-moz"))) {
      continue;
    }

    if (attrPrefix) {
      attrPrefix->ToString(prefixStr);
    }
    else {
      prefixStr.Truncate();
    }

    bool addNSAttr = false;
    if (kNameSpaceID_XMLNS != namespaceID) {
      nsContentUtils::NameSpaceManager()->GetNameSpaceURI(namespaceID, uriStr);
      addNSAttr = ConfirmPrefix(prefixStr, uriStr, aOriginalElement, true);
    }

    aContent->GetAttr(namespaceID, attrName, valueStr);

    nsDependentAtomString nameStr(attrName);
    bool isJS = IsJavaScript(aContent, attrName, namespaceID, valueStr);

    NS_ENSURE_TRUE(SerializeAttr(prefixStr, nameStr, valueStr, aStr, !isJS), false);

    if (addNSAttr) {
      NS_ASSERTION(!prefixStr.IsEmpty(),
                   "Namespaced attributes must have a prefix");
      NS_ENSURE_TRUE(SerializeAttr(xmlnsStr, prefixStr, uriStr, aStr, true), false);
      PushNameSpaceDecl(prefixStr, uriStr, aOriginalElement);
    }
  }

  return true;
}

NS_IMETHODIMP
nsXMLContentSerializer::AppendElementStart(Element* aElement,
                                           Element* aOriginalElement,
                                           nsAString& aStr)
{
  NS_ENSURE_ARG(aElement);

  nsIContent* content = aElement;

  bool forceFormat = false;
  nsresult rv = NS_OK;
  if (!CheckElementStart(content, forceFormat, aStr, rv)) {
    // When we go to AppendElementEnd for this element, we're going to
    // MaybeLeaveFromPreContent().  So make sure to MaybeEnterInPreContent()
    // now, so our PreLevel() doesn't get confused.
    MaybeEnterInPreContent(content);
    return rv;
  }

  NS_ENSURE_SUCCESS(rv, rv);

  nsAutoString tagPrefix, tagLocalName, tagNamespaceURI;
  aElement->NodeInfo()->GetPrefix(tagPrefix);
  aElement->NodeInfo()->GetName(tagLocalName);
  aElement->NodeInfo()->GetNamespaceURI(tagNamespaceURI);

  uint32_t skipAttr = ScanNamespaceDeclarations(content,
                          aOriginalElement, tagNamespaceURI);

  nsIAtom *name = content->NodeInfo()->NameAtom();
  bool lineBreakBeforeOpen = LineBreakBeforeOpen(content->GetNameSpaceID(), name);

  if ((mDoFormat || forceFormat) && !mDoRaw && !PreLevel()) {
    if (mColPos && lineBreakBeforeOpen) {
      NS_ENSURE_TRUE(AppendNewLineToString(aStr), NS_ERROR_OUT_OF_MEMORY);
    }
    else {
      NS_ENSURE_TRUE(MaybeAddNewlineForRootNode(aStr), NS_ERROR_OUT_OF_MEMORY);
    }
    if (!mColPos) {
      NS_ENSURE_TRUE(AppendIndentation(aStr), NS_ERROR_OUT_OF_MEMORY);
    }
    else if (mAddSpace) {
      NS_ENSURE_TRUE(AppendToString(char16_t(' '), aStr), NS_ERROR_OUT_OF_MEMORY);
      mAddSpace = false;
    }
  }
  else if (mAddSpace) {
    NS_ENSURE_TRUE(AppendToString(char16_t(' '), aStr), NS_ERROR_OUT_OF_MEMORY);
    mAddSpace = false;
  }
  else {
    NS_ENSURE_TRUE(MaybeAddNewlineForRootNode(aStr), NS_ERROR_OUT_OF_MEMORY);
  }

  // Always reset to avoid false newlines in case MaybeAddNewlineForRootNode wasn't
  // called
  mAddNewlineForRootNode = false;

  bool addNSAttr;
  addNSAttr = ConfirmPrefix(tagPrefix, tagNamespaceURI, aOriginalElement,
                            false);

  // Serialize the qualified name of the element
  NS_ENSURE_TRUE(AppendToString(kLessThan, aStr), NS_ERROR_OUT_OF_MEMORY);
  if (!tagPrefix.IsEmpty()) {
    NS_ENSURE_TRUE(AppendToString(tagPrefix, aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToString(NS_LITERAL_STRING(":"), aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  NS_ENSURE_TRUE(AppendToString(tagLocalName, aStr), NS_ERROR_OUT_OF_MEMORY);

  MaybeEnterInPreContent(content);

  if ((mDoFormat || forceFormat) && !mDoRaw && !PreLevel()) {
    NS_ENSURE_TRUE(IncrIndentation(name), NS_ERROR_OUT_OF_MEMORY);
  }

  NS_ENSURE_TRUE(SerializeAttributes(content, aOriginalElement, tagPrefix, tagNamespaceURI,
                                     name, aStr, skipAttr, addNSAttr),
                 NS_ERROR_OUT_OF_MEMORY);

  NS_ENSURE_TRUE(AppendEndOfElementStart(aElement, aOriginalElement, aStr),
                 NS_ERROR_OUT_OF_MEMORY);

  if ((mDoFormat || forceFormat) && !mDoRaw && !PreLevel()
    && LineBreakAfterOpen(content->GetNameSpaceID(), name)) {
    NS_ENSURE_TRUE(AppendNewLineToString(aStr), NS_ERROR_OUT_OF_MEMORY);
  }

  NS_ENSURE_TRUE(AfterElementStart(content, aOriginalElement, aStr), NS_ERROR_OUT_OF_MEMORY);

  return NS_OK;
}

// aElement is the actual element we're outputting.  aOriginalElement is the one
// in the original DOM, which is the one we have to test for kids.
static bool
ElementNeedsSeparateEndTag(Element* aElement, Element* aOriginalElement)
{
  if (aOriginalElement->GetChildCount()) {
    // We have kids, so we need a separate end tag.  This needs to be checked on
    // aOriginalElement because that's the one that's actually in the DOM and
    // might have kids.
    return true;
  }

  if (!aElement->IsHTMLElement()) {
    // Empty non-HTML elements can just skip a separate end tag.
    return false;
  }

  // HTML container tags should have a separate end tag even if empty, per spec.
  // See
  // https://w3c.github.io/DOM-Parsing/#dfn-concept-xml-serialization-algorithm
  nsIAtom* localName = aElement->NodeInfo()->NameAtom();
  bool isHTMLContainer =
    nsHTMLElement::IsContainer(nsHTMLTags::CaseSensitiveAtomTagToId(localName));
  return isHTMLContainer;
}

bool
nsXMLContentSerializer::AppendEndOfElementStart(Element* aElement,
                                                Element* aOriginalElement,
                                                nsAString& aStr)
{
  if (ElementNeedsSeparateEndTag(aElement, aOriginalElement)) {
    return AppendToString(kGreaterThan, aStr);
  }

  // We don't need a separate end tag.  For HTML elements (which at this point
  // must be non-containers), append a space before the '/', per spec.  See
  // https://w3c.github.io/DOM-Parsing/#dfn-concept-xml-serialization-algorithm
  if (aOriginalElement->IsHTMLElement()) {
    if (!AppendToString(kSpace, aStr)) {
      return false;
    }
  }

  return AppendToString(NS_LITERAL_STRING("/>"), aStr);
}

NS_IMETHODIMP
nsXMLContentSerializer::AppendElementEnd(Element* aElement,
                                         Element* aOriginalElement,
                                         nsAString& aStr)
{
  NS_ENSURE_ARG(aElement);

  nsIContent* content = aElement;

  bool forceFormat = false, outputElementEnd;
  outputElementEnd = CheckElementEnd(aElement, aOriginalElement, forceFormat, aStr);

  nsIAtom *name = content->NodeInfo()->NameAtom();

  if ((mDoFormat || forceFormat) && !mDoRaw && !PreLevel()) {
    DecrIndentation(name);
  }

  if (!outputElementEnd) {
    // Keep this in sync with the cleanup at the end of this method.
    PopNameSpaceDeclsFor(aElement);
    MaybeLeaveFromPreContent(content);
    MaybeFlagNewlineForRootNode(aElement);
    AfterElementEnd(content, aStr);
    return NS_OK;
  }

  nsAutoString tagPrefix, tagLocalName, tagNamespaceURI;

  aElement->NodeInfo()->GetPrefix(tagPrefix);
  aElement->NodeInfo()->GetName(tagLocalName);
  aElement->NodeInfo()->GetNamespaceURI(tagNamespaceURI);

#ifdef DEBUG
  bool debugNeedToPushNamespace =
#endif
  ConfirmPrefix(tagPrefix, tagNamespaceURI, aElement, false);
  NS_ASSERTION(!debugNeedToPushNamespace, "Can't push namespaces in closing tag!");

  if ((mDoFormat || forceFormat) && !mDoRaw && !PreLevel()) {

    bool lineBreakBeforeClose = LineBreakBeforeClose(content->GetNameSpaceID(), name);

    if (mColPos && lineBreakBeforeClose) {
      NS_ENSURE_TRUE(AppendNewLineToString(aStr), NS_ERROR_OUT_OF_MEMORY);
    }
    if (!mColPos) {
      NS_ENSURE_TRUE(AppendIndentation(aStr), NS_ERROR_OUT_OF_MEMORY);
    }
    else if (mAddSpace) {
      NS_ENSURE_TRUE(AppendToString(char16_t(' '), aStr), NS_ERROR_OUT_OF_MEMORY);
      mAddSpace = false;
    }
  }
  else if (mAddSpace) {
    NS_ENSURE_TRUE(AppendToString(char16_t(' '), aStr), NS_ERROR_OUT_OF_MEMORY);
    mAddSpace = false;
  }

  NS_ENSURE_TRUE(AppendToString(kEndTag, aStr), NS_ERROR_OUT_OF_MEMORY);
  if (!tagPrefix.IsEmpty()) {
    NS_ENSURE_TRUE(AppendToString(tagPrefix, aStr), NS_ERROR_OUT_OF_MEMORY);
    NS_ENSURE_TRUE(AppendToString(NS_LITERAL_STRING(":"), aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  NS_ENSURE_TRUE(AppendToString(tagLocalName, aStr), NS_ERROR_OUT_OF_MEMORY);
  NS_ENSURE_TRUE(AppendToString(kGreaterThan, aStr), NS_ERROR_OUT_OF_MEMORY);

  // Keep what follows in sync with the cleanup in the !outputElementEnd case.
  PopNameSpaceDeclsFor(aElement);

  MaybeLeaveFromPreContent(content);

  if ((mDoFormat || forceFormat) && !mDoRaw && !PreLevel()
      && LineBreakAfterClose(content->GetNameSpaceID(), name)) {
    NS_ENSURE_TRUE(AppendNewLineToString(aStr), NS_ERROR_OUT_OF_MEMORY);
  }
  else {
    MaybeFlagNewlineForRootNode(aElement);
  }

  AfterElementEnd(content, aStr);

  return NS_OK;
}

NS_IMETHODIMP
nsXMLContentSerializer::AppendDocumentStart(nsIDocument *aDocument,
                                            nsAString& aStr)
{
  NS_ENSURE_ARG_POINTER(aDocument);

  nsAutoString version, encoding, standalone;
  aDocument->GetXMLDeclaration(version, encoding, standalone);

  if (version.IsEmpty())
    return NS_OK; // A declaration must have version, or there is no decl

  NS_NAMED_LITERAL_STRING(endQuote, "\"");

  aStr += NS_LITERAL_STRING("<?xml version=\"") + version + endQuote;

  if (!mCharset.IsEmpty()) {
    aStr += NS_LITERAL_STRING(" encoding=\"") +
      NS_ConvertASCIItoUTF16(mCharset) + endQuote;
  }
  // Otherwise just don't output an encoding attr.  Not that we expect
  // mCharset to ever be empty.
#ifdef DEBUG
  else {
    NS_WARNING("Empty mCharset?  How come?");
  }
#endif

  if (!standalone.IsEmpty()) {
    aStr += NS_LITERAL_STRING(" standalone=\"") + standalone + endQuote;
  }

  NS_ENSURE_TRUE(aStr.AppendLiteral("?>", mozilla::fallible), NS_ERROR_OUT_OF_MEMORY);
  mAddNewlineForRootNode = true;

  return NS_OK;
}

bool
nsXMLContentSerializer::CheckElementStart(nsIContent * aContent,
                                          bool & aForceFormat,
                                          nsAString& aStr,
                                          nsresult& aResult)
{
  aResult = NS_OK;
  aForceFormat = false;
  return true;
}

bool
nsXMLContentSerializer::CheckElementEnd(Element* aElement,
                                        Element* aOriginalElement,
                                        bool& aForceFormat,
                                        nsAString& aStr)
{
  // We don't output a separate end tag for empty element
  aForceFormat = false;

  return ElementNeedsSeparateEndTag(aElement, aOriginalElement);
}

bool
nsXMLContentSerializer::AppendToString(const char16_t aChar,
                                       nsAString& aOutputStr)
{
  if (mBodyOnly && !mInBody) {
    return true;
  }
  mColPos += 1;
  return aOutputStr.Append(aChar, mozilla::fallible);
}

bool
nsXMLContentSerializer::AppendToString(const nsAString& aStr,
                                       nsAString& aOutputStr)
{
  if (mBodyOnly && !mInBody) {
    return true;
  }
  mColPos += aStr.Length();
  return aOutputStr.Append(aStr, mozilla::fallible);
}


static const uint16_t kGTVal = 62;

#define _ 0

// This table indexes into kEntityStrings[].
static const uint8_t kEntities[] = {
  _, _, _, _, _, _, _, _, _, _,
  _, _, _, _, _, _, _, _, _, _,
  _, _, _, _, _, _, _, _, _, _,
  _, _, _, _, _, _, _, _, 2, _,
  _, _, _, _, _, _, _, _, _, _,
  _, _, _, _, _, _, _, _, _, _,
  3, _, 4
};

// This table indexes into kEntityStrings[].
static const uint8_t kAttrEntities[] = {
  _, _, _, _, _, _, _, _, _, _,
  _, _, _, _, _, _, _, _, _, _,
  _, _, _, _, _, _, _, _, _, _,
  _, _, _, _, 1, _, _, _, 2, _,
  _, _, _, _, _, _, _, _, _, _,
  _, _, _, _, _, _, _, _, _, _,
  3, _, 4
};

#undef _

static const char* const kEntityStrings[] = {
  /* 0 */ nullptr,
  /* 1 */ "&quot;",
  /* 2 */ "&amp;",
  /* 3 */ "&lt;",
  /* 4 */ "&gt;",
};

bool
nsXMLContentSerializer::AppendAndTranslateEntities(const nsAString& aStr,
                                                   nsAString& aOutputStr)
{
  nsReadingIterator<char16_t> done_reading;
  aStr.EndReading(done_reading);

  // for each chunk of |aString|...
  uint32_t advanceLength = 0;
  nsReadingIterator<char16_t> iter;

  const uint8_t* entityTable = mInAttribute ? kAttrEntities : kEntities;

  for (aStr.BeginReading(iter);
       iter != done_reading;
       iter.advance(int32_t(advanceLength))) {
    uint32_t fragmentLength = done_reading - iter;
    const char16_t* c = iter.get();
    const char16_t* fragmentStart = c;
    const char16_t* fragmentEnd = c + fragmentLength;
    const char* entityText = nullptr;

    advanceLength = 0;
    // for each character in this chunk, check if it
    // needs to be replaced
    for (; c < fragmentEnd; c++, advanceLength++) {
      char16_t val = *c;
      if ((val <= kGTVal) && entityTable[val]) {
        entityText = kEntityStrings[entityTable[val]];
        break;
      }
    }

    NS_ENSURE_TRUE(aOutputStr.Append(fragmentStart, advanceLength, mozilla::fallible), false);
    if (entityText) {
      NS_ENSURE_TRUE(AppendASCIItoUTF16(entityText, aOutputStr, mozilla::fallible), false);
      advanceLength++;
    }
  }

  return true;
}

bool
nsXMLContentSerializer::MaybeAddNewlineForRootNode(nsAString& aStr)
{
  if (mAddNewlineForRootNode) {
    return AppendNewLineToString(aStr);
  }

  return true;
}

void
nsXMLContentSerializer::MaybeFlagNewlineForRootNode(nsINode* aNode)
{
  nsINode* parent = aNode->GetParentNode();
  if (parent) {
    mAddNewlineForRootNode = parent->IsNodeOfType(nsINode::eDOCUMENT);
  }
}

void
nsXMLContentSerializer::MaybeEnterInPreContent(nsIContent* aNode)
{
  // support of the xml:space attribute
  if (ShouldMaintainPreLevel() &&
      aNode->HasAttr(kNameSpaceID_XML, nsGkAtoms::space)) {
    nsAutoString space;
    aNode->GetAttr(kNameSpaceID_XML, nsGkAtoms::space, space);
    if (space.EqualsLiteral("preserve"))
      ++PreLevel();
  }
}

void
nsXMLContentSerializer::MaybeLeaveFromPreContent(nsIContent* aNode)
{
  // support of the xml:space attribute
  if (ShouldMaintainPreLevel() &&
      aNode->HasAttr(kNameSpaceID_XML, nsGkAtoms::space)) {
    nsAutoString space;
    aNode->GetAttr(kNameSpaceID_XML, nsGkAtoms::space, space);
    if (space.EqualsLiteral("preserve"))
      --PreLevel();
  }
}

bool
nsXMLContentSerializer::AppendNewLineToString(nsAString& aStr)
{
  bool result = AppendToString(mLineBreak, aStr);
  mMayIgnoreLineBreakSequence = true;
  mColPos = 0;
  mAddSpace = false;
  mIsIndentationAddedOnCurrentLine = false;
  return result;
}

bool
nsXMLContentSerializer::AppendIndentation(nsAString& aStr)
{
  mIsIndentationAddedOnCurrentLine = true;
  bool result = AppendToString(mIndent, aStr);
  mAddSpace = false;
  mMayIgnoreLineBreakSequence = false;
  return result;
}

bool
nsXMLContentSerializer::IncrIndentation(nsIAtom* aName)
{
  // we want to keep the source readable
  if (mDoWrap &&
      mIndent.Length() >= uint32_t(mMaxColumn) - MIN_INDENTED_LINE_LENGTH) {
    ++mIndentOverflow;
  }
  else {
    return mIndent.AppendLiteral(INDENT_STRING, mozilla::fallible);
  }

  return true;
}

void
nsXMLContentSerializer::DecrIndentation(nsIAtom* aName)
{
  if(mIndentOverflow)
    --mIndentOverflow;
  else
    mIndent.Cut(0, INDENT_STRING_LENGTH);
}

bool
nsXMLContentSerializer::LineBreakBeforeOpen(int32_t aNamespaceID, nsIAtom* aName)
{
  return mAddSpace;
}

bool
nsXMLContentSerializer::LineBreakAfterOpen(int32_t aNamespaceID, nsIAtom* aName)
{
  return false;
}

bool
nsXMLContentSerializer::LineBreakBeforeClose(int32_t aNamespaceID, nsIAtom* aName)
{
  return mAddSpace;
}

bool
nsXMLContentSerializer::LineBreakAfterClose(int32_t aNamespaceID, nsIAtom* aName)
{
  return false;
}

bool
nsXMLContentSerializer::AppendToStringConvertLF(const nsAString& aStr,
                                                nsAString& aOutputStr)
{
  if (mBodyOnly && !mInBody) {
    return true;
  }

  if (mDoRaw) {
    NS_ENSURE_TRUE(AppendToString(aStr, aOutputStr), false);
  }
  else {
    // Convert line-endings to mLineBreak
    uint32_t start = 0;
    uint32_t theLen = aStr.Length();
    while (start < theLen) {
      int32_t eol = aStr.FindChar('\n', start);
      if (eol == kNotFound) {
        nsDependentSubstring dataSubstring(aStr, start, theLen - start);
        NS_ENSURE_TRUE(AppendToString(dataSubstring, aOutputStr), false);
        start = theLen;
        // if there was a line break before this substring
        // AppendNewLineToString was called, so we should reverse
        // this flag
        mMayIgnoreLineBreakSequence = false;
      }
      else {
        nsDependentSubstring dataSubstring(aStr, start, eol - start);
        NS_ENSURE_TRUE(AppendToString(dataSubstring, aOutputStr), false);
        NS_ENSURE_TRUE(AppendNewLineToString(aOutputStr), false);
        start = eol + 1;
      }
    }
  }

  return true;
}

bool
nsXMLContentSerializer::AppendFormatedWrapped_WhitespaceSequence(
                        nsASingleFragmentString::const_char_iterator &aPos,
                        const nsASingleFragmentString::const_char_iterator aEnd,
                        const nsASingleFragmentString::const_char_iterator aSequenceStart,
                        bool &aMayIgnoreStartOfLineWhitespaceSequence,
                        nsAString &aOutputStr)
{
  // Handle the complete sequence of whitespace.
  // Continue to iterate until we find the first non-whitespace char.
  // Updates "aPos" to point to the first unhandled char.
  // Also updates the aMayIgnoreStartOfLineWhitespaceSequence flag,
  // as well as the other "global" state flags.

  bool sawBlankOrTab = false;
  bool leaveLoop = false;

  do {
    switch (*aPos) {
      case ' ':
      case '\t':
        sawBlankOrTab = true;
        [[fallthrough]];
      case '\n':
        ++aPos;
        // do not increase mColPos,
        // because we will reduce the whitespace to a single char
        break;
      default:
        leaveLoop = true;
        break;
    }
  } while (!leaveLoop && aPos < aEnd);

  if (mAddSpace) {
    // if we had previously been asked to add space,
    // our situation has not changed
  }
  else if (!sawBlankOrTab && mMayIgnoreLineBreakSequence) {
    // nothing to do in the case where line breaks have already been added
    // before the call of AppendToStringWrapped
    // and only if we found line break in the sequence
    mMayIgnoreLineBreakSequence = false;
  }
  else if (aMayIgnoreStartOfLineWhitespaceSequence) {
    // nothing to do
    aMayIgnoreStartOfLineWhitespaceSequence = false;
  }
  else {
    if (sawBlankOrTab) {
      if (mDoWrap && mColPos + 1 >= mMaxColumn) {
        // no much sense in delaying, we only have one slot left,
        // let's write a break now
        bool result = aOutputStr.Append(mLineBreak, mozilla::fallible);
        mColPos = 0;
        mIsIndentationAddedOnCurrentLine = false;
        mMayIgnoreLineBreakSequence = true;
        NS_ENSURE_TRUE(result, false);
      }
      else {
        // do not write out yet, we may write out either a space or a linebreak
        // let's delay writing it out until we know more
        mAddSpace = true;
        ++mColPos; // eat a slot of available space
      }
    }
    else {
      // Asian text usually does not contain spaces, therefore we should not
      // transform a linebreak into a space.
      // Since we only saw linebreaks, but no spaces or tabs,
      // let's write a linebreak now.
      NS_ENSURE_TRUE(AppendNewLineToString(aOutputStr), false);
    }
  }

  return true;
}

bool
nsXMLContentSerializer::AppendWrapped_NonWhitespaceSequence(
                        nsASingleFragmentString::const_char_iterator &aPos,
                        const nsASingleFragmentString::const_char_iterator aEnd,
                        const nsASingleFragmentString::const_char_iterator aSequenceStart,
                        bool &aMayIgnoreStartOfLineWhitespaceSequence,
                        bool &aSequenceStartAfterAWhiteSpace,
                        nsAString& aOutputStr)
{
  mMayIgnoreLineBreakSequence = false;
  aMayIgnoreStartOfLineWhitespaceSequence = false;

  // Handle the complete sequence of non-whitespace in this block
  // Iterate until we find the first whitespace char or an aEnd condition
  // Updates "aPos" to point to the first unhandled char.
  // Also updates the aMayIgnoreStartOfLineWhitespaceSequence flag,
  // as well as the other "global" state flags.

  bool thisSequenceStartsAtBeginningOfLine = !mColPos;
  bool onceAgainBecauseWeAddedBreakInFront = false;
  bool foundWhitespaceInLoop;
  uint32_t length, colPos;

  do {

    if (mColPos) {
      colPos = mColPos;
    }
    else {
      if (mDoFormat && !mDoRaw && !PreLevel() && !onceAgainBecauseWeAddedBreakInFront) {
        colPos = mIndent.Length();
      }
      else
        colPos = 0;
    }
    foundWhitespaceInLoop = false;
    length = 0;
    // we iterate until the next whitespace character
    // or until we reach the maximum of character per line
    // or until the end of the string to add.
    do {
      if (*aPos == ' ' || *aPos == '\t' || *aPos == '\n') {
        foundWhitespaceInLoop = true;
        break;
      }

      ++aPos;
      ++length;
    } while ( (!mDoWrap || colPos + length < mMaxColumn) && aPos < aEnd);

    // in the case we don't reached the end of the string, but we reached the maxcolumn,
    // we see if there is a whitespace after the maxcolumn
    // if yes, then we can append directly the string instead of
    // appending a new line etc.
    if (*aPos == ' ' || *aPos == '\t' || *aPos == '\n') {
      foundWhitespaceInLoop = true;
    }

    if (aPos == aEnd || foundWhitespaceInLoop) {
      // there is enough room for the complete block we found
      if (mDoFormat && !mColPos) {
        NS_ENSURE_TRUE(AppendIndentation(aOutputStr), false);
      }
      else if (mAddSpace) {
        bool result = aOutputStr.Append(char16_t(' '), mozilla::fallible);
        mAddSpace = false;
        NS_ENSURE_TRUE(result, false);
      }

      mColPos += length;
      NS_ENSURE_TRUE(aOutputStr.Append(aSequenceStart, aPos - aSequenceStart, mozilla::fallible), false);

      // We have not yet reached the max column, we will continue to
      // fill the current line in the next outer loop iteration
      // (this one in AppendToStringWrapped)
      // make sure we return in this outer loop
      onceAgainBecauseWeAddedBreakInFront = false;
    }
    else { // we reach the max column
      if (!thisSequenceStartsAtBeginningOfLine &&
          (mAddSpace || (!mDoFormat && aSequenceStartAfterAWhiteSpace))) {
          // when !mDoFormat, mAddSpace is not used, mAddSpace is always false
          // so, in the case where mDoWrap && !mDoFormat, if we want to enter in this condition...

        // We can avoid to wrap. We try to add the whole block
        // in an empty new line

        NS_ENSURE_TRUE(AppendNewLineToString(aOutputStr), false);
        aPos = aSequenceStart;
        thisSequenceStartsAtBeginningOfLine = true;
        onceAgainBecauseWeAddedBreakInFront = true;
      }
      else {
        // we must wrap
        onceAgainBecauseWeAddedBreakInFront = false;
        bool foundWrapPosition = false;
        int32_t wrapPosition = 0;

        if (mAllowLineBreaking) {
          nsILineBreaker *lineBreaker = nsContentUtils::LineBreaker();

          wrapPosition = lineBreaker->Prev(aSequenceStart,
                                           (aEnd - aSequenceStart),
                                           (aPos - aSequenceStart) + 1);
          if (wrapPosition != NS_LINEBREAKER_NEED_MORE_TEXT) {
            foundWrapPosition = true;
          }
          else {
            wrapPosition = lineBreaker->Next(aSequenceStart,
                                             (aEnd - aSequenceStart),
                                             (aPos - aSequenceStart));
            if (wrapPosition != NS_LINEBREAKER_NEED_MORE_TEXT) {
              foundWrapPosition = true;
            }
          }
        }

        if (foundWrapPosition) {
          if (!mColPos && mDoFormat) {
            NS_ENSURE_TRUE(AppendIndentation(aOutputStr), false);
          }
          else if (mAddSpace) {
            bool result = aOutputStr.Append(char16_t(' '), mozilla::fallible);
            mAddSpace = false;
            NS_ENSURE_TRUE(result, false);
          }
          NS_ENSURE_TRUE(aOutputStr.Append(aSequenceStart, wrapPosition, mozilla::fallible), false);

          NS_ENSURE_TRUE(AppendNewLineToString(aOutputStr), false);
          aPos = aSequenceStart + wrapPosition;
          aMayIgnoreStartOfLineWhitespaceSequence = true;
        }
        else {
          // try some simple fallback logic
          // go forward up to the next whitespace position,
          // in the worst case this will be all the rest of the data

          // we update the mColPos variable with the length of
          // the part already parsed.
          mColPos += length;

          // now try to find the next whitespace
          do {
            if (*aPos == ' ' || *aPos == '\t' || *aPos == '\n') {
              break;
            }

            ++aPos;
            ++mColPos;
          } while (aPos < aEnd);

          if (mAddSpace) {
            bool result = aOutputStr.Append(char16_t(' '), mozilla::fallible);
            mAddSpace = false;
            NS_ENSURE_TRUE(result, false);
          }
          NS_ENSURE_TRUE(aOutputStr.Append(aSequenceStart, aPos - aSequenceStart, mozilla::fallible), false);
        }
      }
      aSequenceStartAfterAWhiteSpace = false;
    }
  } while (onceAgainBecauseWeAddedBreakInFront);

  return true;
}

bool
nsXMLContentSerializer::AppendToStringFormatedWrapped(const nsASingleFragmentString& aStr,
                                                      nsAString& aOutputStr)
{
  if (mBodyOnly && !mInBody) {
    return true;
  }

  nsASingleFragmentString::const_char_iterator pos, end, sequenceStart;

  aStr.BeginReading(pos);
  aStr.EndReading(end);

  bool sequenceStartAfterAWhitespace = false;
  if (pos < end) {
    nsAString::const_char_iterator end2;
    aOutputStr.EndReading(end2);
    --end2;
    if (*end2 == ' ' || *end2 == '\n' || *end2 == '\t') {
      sequenceStartAfterAWhitespace = true;
    }
  }

  // if the current line already has text on it, such as a tag,
  // leading whitespace is significant
  bool mayIgnoreStartOfLineWhitespaceSequence =
    (!mColPos || (mIsIndentationAddedOnCurrentLine &&
                  sequenceStartAfterAWhitespace &&
                  uint32_t(mColPos) == mIndent.Length()));

  while (pos < end) {
    sequenceStart = pos;

    // if beginning of a whitespace sequence
    if (*pos == ' ' || *pos == '\n' || *pos == '\t') {
      NS_ENSURE_TRUE(AppendFormatedWrapped_WhitespaceSequence(pos, end, sequenceStart,
        mayIgnoreStartOfLineWhitespaceSequence, aOutputStr), false);
    }
    else { // any other non-whitespace char
      NS_ENSURE_TRUE(AppendWrapped_NonWhitespaceSequence(pos, end, sequenceStart,
        mayIgnoreStartOfLineWhitespaceSequence, sequenceStartAfterAWhitespace,
        aOutputStr), false);
    }
  }

  return true;
}

bool
nsXMLContentSerializer::AppendWrapped_WhitespaceSequence(
                        nsASingleFragmentString::const_char_iterator &aPos,
                        const nsASingleFragmentString::const_char_iterator aEnd,
                        const nsASingleFragmentString::const_char_iterator aSequenceStart,
                        nsAString &aOutputStr)
{
  // Handle the complete sequence of whitespace.
  // Continue to iterate until we find the first non-whitespace char.
  // Updates "aPos" to point to the first unhandled char.
  mAddSpace = false;
  mIsIndentationAddedOnCurrentLine = false;

  bool leaveLoop = false;
  nsASingleFragmentString::const_char_iterator lastPos = aPos;

  do {
    switch (*aPos) {
      case ' ':
      case '\t':
        // if there are too many spaces on a line, we wrap
        if (mColPos >= mMaxColumn) {
          if (lastPos != aPos) {
            NS_ENSURE_TRUE(aOutputStr.Append(lastPos, aPos - lastPos, mozilla::fallible), false);
          }
          NS_ENSURE_TRUE(AppendToString(mLineBreak, aOutputStr), false);
          mColPos = 0;
          lastPos = aPos;
        }

        ++mColPos;
        ++aPos;
        break;
      case '\n':
        if (lastPos != aPos) {
          NS_ENSURE_TRUE(aOutputStr.Append(lastPos, aPos - lastPos, mozilla::fallible), false);
        }
        NS_ENSURE_TRUE(AppendToString(mLineBreak, aOutputStr), false);
        mColPos = 0;
        ++aPos;
        lastPos = aPos;
        break;
      default:
        leaveLoop = true;
        break;
    }
  } while (!leaveLoop && aPos < aEnd);

  if (lastPos != aPos) {
    NS_ENSURE_TRUE(aOutputStr.Append(lastPos, aPos - lastPos, mozilla::fallible), false);
  }

  return true;
}

bool
nsXMLContentSerializer::AppendToStringWrapped(const nsASingleFragmentString& aStr,
                                              nsAString& aOutputStr)
{
  if (mBodyOnly && !mInBody) {
    return true;
  }

  nsASingleFragmentString::const_char_iterator pos, end, sequenceStart;

  aStr.BeginReading(pos);
  aStr.EndReading(end);

  // not used in this case, but needed by AppendWrapped_NonWhitespaceSequence
  bool mayIgnoreStartOfLineWhitespaceSequence = false;
  mMayIgnoreLineBreakSequence = false;

  bool sequenceStartAfterAWhitespace = false;
  if (pos < end && !aOutputStr.IsEmpty()) {
    nsAString::const_char_iterator end2;
    aOutputStr.EndReading(end2);
    --end2;
    if (*end2 == ' ' || *end2 == '\n' || *end2 == '\t') {
      sequenceStartAfterAWhitespace = true;
    }
  }

  while (pos < end) {
    sequenceStart = pos;

    // if beginning of a whitespace sequence
    if (*pos == ' ' || *pos == '\n' || *pos == '\t') {
      sequenceStartAfterAWhitespace = true;
      NS_ENSURE_TRUE(AppendWrapped_WhitespaceSequence(pos, end,
        sequenceStart, aOutputStr), false);
    }
    else { // any other non-whitespace char
      NS_ENSURE_TRUE(AppendWrapped_NonWhitespaceSequence(pos, end, sequenceStart,
        mayIgnoreStartOfLineWhitespaceSequence,
        sequenceStartAfterAWhitespace, aOutputStr), false);
    }
  }

  return true;
}

bool
nsXMLContentSerializer::ShouldMaintainPreLevel() const
{
  // Only attempt to maintain the pre level for consumers who care about it.
  return !mDoRaw || (mFlags & nsIDocumentEncoder::OutputNoFormattingInPre);
}