summaryrefslogtreecommitdiffstats
path: root/dom/html/nsHTMLContentSink.cpp
blob: 938fcd16976acf625b25ff166c47e5b096ef1357 (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
/* -*- 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/. */

/**
 * This file is near-OBSOLETE. It is used for about:blank only and for the
 * HTML element factory.
 * Don't bother adding new stuff in this file.
 */

#include "mozilla/ArrayUtils.h"

#include "nsContentSink.h"
#include "nsCOMPtr.h"
#include "nsHTMLTags.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsIHTMLContentSink.h"
#include "nsIInterfaceRequestor.h"
#include "nsIInterfaceRequestorUtils.h"
#include "nsIURI.h"
#include "nsIContentViewer.h"
#include "mozilla/dom/NodeInfo.h"
#include "mozilla/dom/ScriptLoader.h"
#include "nsToken.h"
#include "nsIAppShell.h"
#include "nsCRT.h"
#include "prtime.h"
#include "mozilla/Logging.h"
#include "nsNodeUtils.h"
#include "nsIContent.h"
#include "mozilla/dom/CustomElementRegistry.h"
#include "mozilla/dom/Element.h"
#include "mozilla/Preferences.h"

#include "nsGenericHTMLElement.h"

#include "nsIDOMDocument.h"
#include "nsIDOMDocumentType.h"
#include "nsIScriptElement.h"

#include "nsIComponentManager.h"
#include "nsIServiceManager.h"

#include "nsGkAtoms.h"
#include "nsContentUtils.h"
#include "nsIChannel.h"
#include "nsIHttpChannel.h"
#include "nsIDocShell.h"
#include "nsIDocument.h"
#include "nsStubDocumentObserver.h"
#include "nsIHTMLDocument.h"
#include "nsIDOMHTMLMapElement.h"
#include "nsICookieService.h"
#include "nsTArray.h"
#include "nsIScriptSecurityManager.h"
#include "nsIPrincipal.h"
#include "nsTextFragment.h"
#include "nsIScriptGlobalObject.h"
#include "nsNameSpaceManager.h"

#include "nsIStyleSheetLinkingElement.h"
#include "nsITimer.h"
#include "nsError.h"
#include "nsContentPolicyUtils.h"
#include "nsIScriptContext.h"
#include "nsStyleLinkElement.h"

#include "nsWeakReference.h" // nsHTMLElementFactory supports weak references
#include "nsIPrompt.h"
#include "nsLayoutCID.h"
#include "nsIDocShellTreeItem.h"

#include "nsEscape.h"
#include "nsNodeInfoManager.h"
#include "nsContentCreatorFunctions.h"
#include "mozAutoDocUpdate.h"
#include "nsTextNode.h"

using namespace mozilla;
using namespace mozilla::dom;

//----------------------------------------------------------------------

nsGenericHTMLElement*
NS_NewHTMLNOTUSEDElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
                         FromParser aFromParser)
{
  NS_NOTREACHED("The element ctor should never be called");
  return nullptr;
}

#define HTML_TAG(_tag, _classname, _interfacename) NS_NewHTML##_classname##Element,
#define HTML_OTHER(_tag) NS_NewHTMLNOTUSEDElement,
static const HTMLContentCreatorFunction sHTMLContentCreatorFunctions[] = {
  NS_NewHTMLUnknownElement,
#include "nsHTMLTagList.h"
#undef HTML_TAG
#undef HTML_OTHER
  NS_NewHTMLUnknownElement
};

class SinkContext;
class HTMLContentSink;

/**
 * This class is near-OBSOLETE. It is used for about:blank only.
 * Don't bother adding new stuff in this file.
 */
class HTMLContentSink : public nsContentSink,
                        public nsIHTMLContentSink
{
public:
  friend class SinkContext;

  HTMLContentSink();

  NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW

  nsresult Init(nsIDocument* aDoc, nsIURI* aURI, nsISupports* aContainer,
                nsIChannel* aChannel);

  // nsISupports
  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLContentSink, nsContentSink)

  // nsIContentSink
  NS_IMETHOD WillParse(void) override;
  NS_IMETHOD WillBuildModel(nsDTDMode aDTDMode) override;
  NS_IMETHOD DidBuildModel(bool aTerminated) override;
  NS_IMETHOD WillInterrupt(void) override;
  NS_IMETHOD WillResume(void) override;
  NS_IMETHOD SetParser(nsParserBase* aParser) override;
  virtual void FlushPendingNotifications(mozFlushType aType) override;
  NS_IMETHOD SetDocumentCharset(nsACString& aCharset) override;
  virtual nsISupports *GetTarget() override;
  virtual bool IsScriptExecuting() override;

  // nsIHTMLContentSink
  NS_IMETHOD OpenContainer(ElementType aNodeType) override;
  NS_IMETHOD CloseContainer(ElementType aTag) override;

protected:
  virtual ~HTMLContentSink();

  nsCOMPtr<nsIHTMLDocument> mHTMLDocument;

  // The maximum length of a text run
  int32_t mMaxTextRun;

  RefPtr<nsGenericHTMLElement> mRoot;
  RefPtr<nsGenericHTMLElement> mBody;
  RefPtr<nsGenericHTMLElement> mHead;

  AutoTArray<SinkContext*, 8> mContextStack;
  SinkContext* mCurrentContext;
  SinkContext* mHeadContext;

  // Boolean indicating whether we've seen a <head> tag that might have had
  // attributes once already.
  bool mHaveSeenHead;

  // Boolean indicating whether we've notified insertion of our root content
  // yet.  We want to make sure to only do this once.
  bool mNotifiedRootInsertion;

  nsresult FlushTags() override;

  // Routines for tags that require special handling
  nsresult CloseHTML();
  nsresult OpenBody();
  nsresult CloseBody();

  void CloseHeadContext();

  // nsContentSink overrides
  void UpdateChildCounts() override;

  void NotifyInsert(nsIContent* aContent,
                    nsIContent* aChildContent,
                    int32_t aIndexInContainer);
  void NotifyRootInsertion();
};

class SinkContext
{
public:
  explicit SinkContext(HTMLContentSink* aSink);
  ~SinkContext();

  nsresult Begin(nsHTMLTag aNodeType, nsGenericHTMLElement* aRoot,
                 uint32_t aNumFlushed, int32_t aInsertionPoint);
  nsresult OpenBody();
  nsresult CloseBody();
  nsresult End();

  nsresult GrowStack();
  nsresult FlushTags();

  bool     IsCurrentContainer(nsHTMLTag mType);

  void DidAddContent(nsIContent* aContent);
  void UpdateChildCounts();

private:
  // Function to check whether we've notified for the current content.
  // What this actually does is check whether we've notified for all
  // of the parent's kids.
  bool HaveNotifiedForCurrentContent() const;

public:
  HTMLContentSink* mSink;
  int32_t mNotifyLevel;

  struct Node {
    nsHTMLTag mType;
    nsGenericHTMLElement* mContent;
    uint32_t mNumFlushed;
    int32_t mInsertionPoint;

    nsIContent *Add(nsIContent *child);
  };

  Node* mStack;
  int32_t mStackSize;
  int32_t mStackPos;
};

static void
DoCustomElementCreate(Element** aElement, nsIDocument* aDoc, nsIAtom* aLocalName,
                      CustomElementConstructor* aConstructor, ErrorResult& aRv)
{
  RefPtr<Element> element =
    aConstructor->Construct("Custom Element Create", aRv);
  if (aRv.Failed()) {
    return;
  }

  if (!element || !element->IsHTMLElement()) {
    aRv.ThrowTypeError<MSG_THIS_DOES_NOT_IMPLEMENT_INTERFACE>(NS_LITERAL_STRING("HTMLElement"));
    return;
  }

  if (aDoc != element->OwnerDoc() || element->GetParentNode() ||
      element->HasChildren() || element->GetAttrCount() ||
      element->NodeInfo()->NameAtom() != aLocalName) {
    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
    return;
  }

  element.forget(aElement);
}

nsresult
NS_NewHTMLElement(Element** aResult, already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
                  FromParser aFromParser, const nsAString* aIs,
                  mozilla::dom::CustomElementDefinition* aDefinition)
{
  *aResult = nullptr;

  RefPtr<mozilla::dom::NodeInfo> nodeInfo = aNodeInfo;

  nsIAtom *name = nodeInfo->NameAtom();
  RefPtr<nsIAtom> tagAtom = nodeInfo->NameAtom();
  RefPtr<nsIAtom> typeAtom = aIs ? NS_Atomize(*aIs) : tagAtom;

  NS_ASSERTION(nodeInfo->NamespaceEquals(kNameSpaceID_XHTML),
               "Trying to HTML elements that don't have the XHTML namespace");

  int32_t tag = nsHTMLTags::CaseSensitiveAtomTagToId(name);

  bool isCustomElementName = (tag == eHTMLTag_userdefined &&
                              nsContentUtils::IsCustomElementName(name));
  bool isCustomElement = isCustomElementName || aIs;
  MOZ_ASSERT_IF(aDefinition, isCustomElement);

  // https://dom.spec.whatwg.org/#concept-create-element
  // We only handle the "synchronous custom elements flag is set" now.
  // For the unset case (e.g. cloning a node), see bug 1319342 for that.
  // Step 4.
  CustomElementDefinition* definition = aDefinition;
  if (CustomElementRegistry::IsCustomElementEnabled() && isCustomElement &&
      !definition) {
    MOZ_ASSERT(nodeInfo->NameAtom()->Equals(nodeInfo->LocalName()));
    definition =
      nsContentUtils::LookupCustomElementDefinition(nodeInfo->GetDocument(),
                                                    nodeInfo->NameAtom(),
                                                    nodeInfo->NamespaceID(),
                                                    typeAtom);
  }

  // It might be a problem that parser synchronously calls constructor, so filed
  // bug 1378079 to figure out what we should do for parser case.
  if (definition) {
    /*
     * Synchronous custom elements flag is determined by 3 places in spec,
     * 1) create an element for a token, the flag is determined by
     *    "will execute script" which is not originally created
     *    for the HTML fragment parsing algorithm.
     * 2) createElement and createElementNS, the flag is the same as
     *    NOT_FROM_PARSER.
     * 3) clone a node, our implementation will not go into this function.
     * For the unset case which is non-synchronous only applied for
     * inner/outerHTML.
     */
    bool synchronousCustomElements = aFromParser != dom::FROM_PARSER_FRAGMENT ||
                                     aFromParser == dom::NOT_FROM_PARSER;
    // Per discussion in https://github.com/w3c/webcomponents/issues/635,
    // use entry global in those places that are called from JS APIs and use the
    // node document's global object if it is called from parser.
    nsIGlobalObject* global;
    if (aFromParser == dom::NOT_FROM_PARSER) {
      global = GetEntryGlobal();
    } else {
      global = nodeInfo->GetDocument()->GetScopeObject();
    }
    if (!global) {
      // In browser chrome code, one may have access to a document which doesn't
      // have scope object anymore.
      return NS_ERROR_FAILURE;
    }

    AutoEntryScript aes(global, "create custom elements");
    JSContext* cx = aes.cx();
    ErrorResult rv;

    // Step 5.
    if (definition->IsCustomBuiltIn()) {
      // SetupCustomElement() should be called with an element that don't have
      // CustomElementData setup, if not we will hit the assertion in
      // SetCustomElementData().
      // Built-in element
      *aResult = CreateHTMLElement(tag, nodeInfo.forget(), aFromParser).take();
      (*aResult)->SetCustomElementData(new CustomElementData(typeAtom));
      if (synchronousCustomElements) {
        CustomElementRegistry::Upgrade(*aResult, definition, rv);
        if (rv.MaybeSetPendingException(cx)) {
          aes.ReportException();
        }
      } else {
        nsContentUtils::EnqueueUpgradeReaction(*aResult, definition);
      }

      return NS_OK;
    }

    // Step 6.1.
    if (synchronousCustomElements) {
      DoCustomElementCreate(aResult, nodeInfo->GetDocument(),
                            nodeInfo->NameAtom(),
                            definition->mConstructor, rv);
      if (rv.MaybeSetPendingException(cx)) {
        NS_IF_ADDREF(*aResult = NS_NewHTMLUnknownElement(nodeInfo.forget(), aFromParser));
      }
      return NS_OK;
    }

    // Step 6.2.
    NS_IF_ADDREF(*aResult = NS_NewHTMLElement(nodeInfo.forget(), aFromParser));
    (*aResult)->SetCustomElementData(new CustomElementData(definition->mType));
    nsContentUtils::EnqueueUpgradeReaction(*aResult, definition);
    return NS_OK;
  }

  // Per the Custom Element specification, unknown tags that are valid custom
  // element names should be HTMLElement instead of HTMLUnknownElement.
  if (isCustomElementName) {
    NS_IF_ADDREF(*aResult = NS_NewHTMLElement(nodeInfo.forget(), aFromParser));
  } else {
    *aResult = CreateHTMLElement(tag, nodeInfo.forget(), aFromParser).take();
  }

  if (!*aResult) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  if (CustomElementRegistry::IsCustomElementEnabled() && isCustomElement) {
    (*aResult)->SetCustomElementData(new CustomElementData(typeAtom));
  }

  return NS_OK;
}

already_AddRefed<nsGenericHTMLElement>
CreateHTMLElement(uint32_t aNodeType,
                  already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
                  FromParser aFromParser)
{
  NS_ASSERTION(aNodeType <= NS_HTML_TAG_MAX ||
               aNodeType == eHTMLTag_userdefined,
               "aNodeType is out of bounds");

  HTMLContentCreatorFunction cb = sHTMLContentCreatorFunctions[aNodeType];

  NS_ASSERTION(cb != NS_NewHTMLNOTUSEDElement,
               "Don't know how to construct tag element!");

  RefPtr<nsGenericHTMLElement> result = cb(Move(aNodeInfo), aFromParser);

  return result.forget();
}

//----------------------------------------------------------------------

SinkContext::SinkContext(HTMLContentSink* aSink)
  : mSink(aSink),
    mNotifyLevel(0),
    mStack(nullptr),
    mStackSize(0),
    mStackPos(0)
{
  MOZ_COUNT_CTOR(SinkContext);
}

SinkContext::~SinkContext()
{
  MOZ_COUNT_DTOR(SinkContext);

  if (mStack) {
    for (int32_t i = 0; i < mStackPos; i++) {
      NS_RELEASE(mStack[i].mContent);
    }
    delete [] mStack;
  }
}

nsresult
SinkContext::Begin(nsHTMLTag aNodeType,
                   nsGenericHTMLElement* aRoot,
                   uint32_t aNumFlushed,
                   int32_t aInsertionPoint)
{
  if (mStackSize < 1) {
    nsresult rv = GrowStack();
    if (NS_FAILED(rv)) {
      return rv;
    }
  }

  mStack[0].mType = aNodeType;
  mStack[0].mContent = aRoot;
  mStack[0].mNumFlushed = aNumFlushed;
  mStack[0].mInsertionPoint = aInsertionPoint;
  NS_ADDREF(aRoot);
  mStackPos = 1;

  return NS_OK;
}

bool
SinkContext::IsCurrentContainer(nsHTMLTag aTag)
{
  if (aTag == mStack[mStackPos - 1].mType) {
    return true;
  }

  return false;
}

void
SinkContext::DidAddContent(nsIContent* aContent)
{
  if ((mStackPos == 2) && (mSink->mBody == mStack[1].mContent)) {
    // We just finished adding something to the body
    mNotifyLevel = 0;
  }

  // If we just added content to a node for which
  // an insertion happen, we need to do an immediate
  // notification for that insertion.
  if (0 < mStackPos &&
      mStack[mStackPos - 1].mInsertionPoint != -1 &&
      mStack[mStackPos - 1].mNumFlushed <
      mStack[mStackPos - 1].mContent->GetChildCount()) {
    nsIContent* parent = mStack[mStackPos - 1].mContent;
    int32_t childIndex = mStack[mStackPos - 1].mInsertionPoint - 1;
    NS_ASSERTION(parent->GetChildAt(childIndex) == aContent,
                 "Flushing the wrong child.");
    mSink->NotifyInsert(parent, aContent, childIndex);
    mStack[mStackPos - 1].mNumFlushed = parent->GetChildCount();
  } else if (mSink->IsTimeToNotify()) {
    FlushTags();
  }
}

nsresult
SinkContext::OpenBody()
{
  if (mStackPos <= 0) {
    NS_ERROR("container w/o parent");

    return NS_ERROR_FAILURE;
  }

  nsresult rv;
  if (mStackPos + 1 > mStackSize) {
    rv = GrowStack();
    if (NS_FAILED(rv)) {
      return rv;
    }
  }

    RefPtr<mozilla::dom::NodeInfo> nodeInfo =
      mSink->mNodeInfoManager->GetNodeInfo(nsGkAtoms::body, nullptr,
                                           kNameSpaceID_XHTML,
                                           nsIDOMNode::ELEMENT_NODE);
  NS_ENSURE_TRUE(nodeInfo, NS_ERROR_UNEXPECTED);

  // Make the content object
  RefPtr<nsGenericHTMLElement> body =
    NS_NewHTMLBodyElement(nodeInfo.forget(), FROM_PARSER_NETWORK);
  if (!body) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  mStack[mStackPos].mType = eHTMLTag_body;
  body.forget(&mStack[mStackPos].mContent);
  mStack[mStackPos].mNumFlushed = 0;
  mStack[mStackPos].mInsertionPoint = -1;
  ++mStackPos;
  mStack[mStackPos - 2].Add(mStack[mStackPos - 1].mContent);

  return NS_OK;
}

bool
SinkContext::HaveNotifiedForCurrentContent() const
{
  if (0 < mStackPos) {
    nsIContent* parent = mStack[mStackPos - 1].mContent;
    return mStack[mStackPos-1].mNumFlushed == parent->GetChildCount();
  }

  return true;
}

nsIContent *
SinkContext::Node::Add(nsIContent *child)
{
  NS_ASSERTION(mContent, "No parent to insert/append into!");
  if (mInsertionPoint != -1) {
    NS_ASSERTION(mNumFlushed == mContent->GetChildCount(),
                 "Inserting multiple children without flushing.");
    mContent->InsertChildAt(child, mInsertionPoint++, false);
  } else {
    mContent->AppendChildTo(child, false);
  }
  return child;
}

nsresult
SinkContext::CloseBody()
{
  NS_ASSERTION(mStackPos > 0,
               "stack out of bounds. wrong context probably!");

  if (mStackPos <= 0) {
    return NS_OK; // Fix crash - Ref. bug 45975 or 45007
  }

  --mStackPos;
  NS_ASSERTION(mStack[mStackPos].mType == eHTMLTag_body,
               "Tag mismatch.  Closing tag on wrong context or something?");

  nsGenericHTMLElement* content = mStack[mStackPos].mContent;

  content->Compact();

  // If we're in a state where we do append notifications as
  // we go up the tree, and we're at the level where the next
  // notification needs to be done, do the notification.
  if (mNotifyLevel >= mStackPos) {
    // Check to see if new content has been added after our last
    // notification

    if (mStack[mStackPos].mNumFlushed < content->GetChildCount()) {
      mSink->NotifyAppend(content, mStack[mStackPos].mNumFlushed);
      mStack[mStackPos].mNumFlushed = content->GetChildCount();
    }

    // Indicate that notification has now happened at this level
    mNotifyLevel = mStackPos - 1;
  }

  DidAddContent(content);
  NS_IF_RELEASE(content);

  return NS_OK;
}

nsresult
SinkContext::End()
{
  for (int32_t i = 0; i < mStackPos; i++) {
    NS_RELEASE(mStack[i].mContent);
  }

  mStackPos = 0;

  return NS_OK;
}

nsresult
SinkContext::GrowStack()
{
  int32_t newSize = mStackSize * 2;
  if (newSize == 0) {
    newSize = 32;
  }

  Node* stack = new Node[newSize];

  if (mStackPos != 0) {
    memcpy(stack, mStack, sizeof(Node) * mStackPos);
    delete [] mStack;
  }

  mStack = stack;
  mStackSize = newSize;

  return NS_OK;
}

/**
 * NOTE!! Forked into nsXMLContentSink. Please keep in sync.
 *
 * Flush all elements that have been seen so far such that
 * they are visible in the tree. Specifically, make sure
 * that they are all added to their respective parents.
 * Also, do notification at the top for all content that
 * has been newly added so that the frame tree is complete.
 */
nsresult
SinkContext::FlushTags()
{
  mSink->mDeferredFlushTags = false;
  bool oldBeganUpdate = mSink->mBeganUpdate;
  uint32_t oldUpdates = mSink->mUpdatesInNotification;

  ++(mSink->mInNotification);
  mSink->mUpdatesInNotification = 0;
  {
    // Scope so we call EndUpdate before we decrease mInNotification
    mozAutoDocUpdate updateBatch(mSink->mDocument, UPDATE_CONTENT_MODEL,
                                 true);
    mSink->mBeganUpdate = true;

    // Start from the base of the stack (growing downward) and do
    // a notification from the node that is closest to the root of
    // tree for any content that has been added.

    // Note that we can start at stackPos == 0 here, because it's the caller's
    // responsibility to handle flushing interactions between contexts (see
    // HTMLContentSink::BeginContext).
    int32_t stackPos = 0;
    bool flushed = false;
    uint32_t childCount;
    nsGenericHTMLElement* content;

    while (stackPos < mStackPos) {
      content = mStack[stackPos].mContent;
      childCount = content->GetChildCount();

      if (!flushed && (mStack[stackPos].mNumFlushed < childCount)) {
        if (mStack[stackPos].mInsertionPoint != -1) {
          // We might have popped the child off our stack already
          // but not notified on it yet, which is why we have to get it
          // directly from its parent node.

          int32_t childIndex = mStack[stackPos].mInsertionPoint - 1;
          nsIContent* child = content->GetChildAt(childIndex);
          // Child not on stack anymore; can't assert it's correct
          NS_ASSERTION(!(mStackPos > (stackPos + 1)) ||
                       (child == mStack[stackPos + 1].mContent),
                       "Flushing the wrong child.");
          mSink->NotifyInsert(content, child, childIndex);
        } else {
          mSink->NotifyAppend(content, mStack[stackPos].mNumFlushed);
        }

        flushed = true;
      }

      mStack[stackPos].mNumFlushed = childCount;
      stackPos++;
    }
    mNotifyLevel = mStackPos - 1;
  }
  --(mSink->mInNotification);

  if (mSink->mUpdatesInNotification > 1) {
    UpdateChildCounts();
  }

  mSink->mUpdatesInNotification = oldUpdates;
  mSink->mBeganUpdate = oldBeganUpdate;

  return NS_OK;
}

/**
 * NOTE!! Forked into nsXMLContentSink. Please keep in sync.
 */
void
SinkContext::UpdateChildCounts()
{
  // Start from the top of the stack (growing upwards) and see if any
  // new content has been appended. If so, we recognize that reflows
  // have been generated for it and we should make sure that no
  // further reflows occur.  Note that we have to include stackPos == 0
  // to properly notify on kids of <html>.
  int32_t stackPos = mStackPos - 1;
  while (stackPos >= 0) {
    Node & node = mStack[stackPos];
    node.mNumFlushed = node.mContent->GetChildCount();

    stackPos--;
  }

  mNotifyLevel = mStackPos - 1;
}

nsresult
NS_NewHTMLContentSink(nsIHTMLContentSink** aResult,
                      nsIDocument* aDoc,
                      nsIURI* aURI,
                      nsISupports* aContainer,
                      nsIChannel* aChannel)
{
  NS_ENSURE_ARG_POINTER(aResult);

  RefPtr<HTMLContentSink> it = new HTMLContentSink();

  nsresult rv = it->Init(aDoc, aURI, aContainer, aChannel);

  NS_ENSURE_SUCCESS(rv, rv);

  *aResult = it;
  NS_ADDREF(*aResult);

  return NS_OK;
}

HTMLContentSink::HTMLContentSink()
{
  // Note: operator new zeros our memory
}

HTMLContentSink::~HTMLContentSink()
{
  if (mNotificationTimer) {
    mNotificationTimer->Cancel();
  }

  int32_t numContexts = mContextStack.Length();

  if (mCurrentContext == mHeadContext && numContexts > 0) {
    // Pop off the second html context if it's not done earlier
    mContextStack.RemoveElementAt(--numContexts);
  }

  int32_t i;
  for (i = 0; i < numContexts; i++) {
    SinkContext* sc = mContextStack.ElementAt(i);
    if (sc) {
      sc->End();
      if (sc == mCurrentContext) {
        mCurrentContext = nullptr;
      }

      delete sc;
    }
  }

  if (mCurrentContext == mHeadContext) {
    mCurrentContext = nullptr;
  }

  delete mCurrentContext;

  delete mHeadContext;
}

NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLContentSink)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLContentSink, nsContentSink)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mHTMLDocument)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mRoot)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mBody)
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mHead)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLContentSink,
                                                  nsContentSink)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHTMLDocument)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBody)
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mHead)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_INTERFACE_TABLE_HEAD_CYCLE_COLLECTION_INHERITED(HTMLContentSink)
  NS_INTERFACE_TABLE_BEGIN
    NS_INTERFACE_TABLE_ENTRY(HTMLContentSink, nsIContentSink)
    NS_INTERFACE_TABLE_ENTRY(HTMLContentSink, nsIHTMLContentSink)
  NS_INTERFACE_TABLE_END
NS_INTERFACE_TABLE_TAIL_INHERITING(nsContentSink)

NS_IMPL_ADDREF_INHERITED(HTMLContentSink, nsContentSink)
NS_IMPL_RELEASE_INHERITED(HTMLContentSink, nsContentSink)

nsresult
HTMLContentSink::Init(nsIDocument* aDoc,
                      nsIURI* aURI,
                      nsISupports* aContainer,
                      nsIChannel* aChannel)
{
  NS_ENSURE_TRUE(aContainer, NS_ERROR_NULL_POINTER);

  nsresult rv = nsContentSink::Init(aDoc, aURI, aContainer, aChannel);
  if (NS_FAILED(rv)) {
    return rv;
  }

  aDoc->AddObserver(this);
  mIsDocumentObserver = true;
  mHTMLDocument = do_QueryInterface(aDoc);

  NS_ASSERTION(mDocShell, "oops no docshell!");

  // Changed from 8192 to greatly improve page loading performance on
  // large pages.  See bugzilla bug 77540.
  mMaxTextRun = Preferences::GetInt("content.maxtextrun", 8191);

  RefPtr<mozilla::dom::NodeInfo> nodeInfo;
  nodeInfo = mNodeInfoManager->GetNodeInfo(nsGkAtoms::html, nullptr,
                                           kNameSpaceID_XHTML,
                                           nsIDOMNode::ELEMENT_NODE);

  // Make root part
  mRoot = NS_NewHTMLHtmlElement(nodeInfo.forget());
  if (!mRoot) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  NS_ASSERTION(mDocument->GetChildCount() == 0,
               "Document should have no kids here!");
  rv = mDocument->AppendChildTo(mRoot, false);
  NS_ENSURE_SUCCESS(rv, rv);

  // Make head part
  nodeInfo = mNodeInfoManager->GetNodeInfo(nsGkAtoms::head,
                                           nullptr, kNameSpaceID_XHTML,
                                           nsIDOMNode::ELEMENT_NODE);

  mHead = NS_NewHTMLHeadElement(nodeInfo.forget());
  if (NS_FAILED(rv)) {
    return NS_ERROR_OUT_OF_MEMORY;
  }

  mRoot->AppendChildTo(mHead, false);

  mCurrentContext = new SinkContext(this);
  mCurrentContext->Begin(eHTMLTag_html, mRoot, 0, -1);
  mContextStack.AppendElement(mCurrentContext);

  return NS_OK;
}

NS_IMETHODIMP
HTMLContentSink::WillParse(void)
{
  return WillParseImpl();
}

NS_IMETHODIMP
HTMLContentSink::WillBuildModel(nsDTDMode aDTDMode)
{
  WillBuildModelImpl();

  if (mHTMLDocument) {
    nsCompatibility mode = eCompatibility_NavQuirks;
    switch (aDTDMode) {
      case eDTDMode_full_standards:
        mode = eCompatibility_FullStandards;
        break;
      case eDTDMode_almost_standards:
        mode = eCompatibility_AlmostStandards;
        break;
      default:
        break;
    }
    mHTMLDocument->SetCompatibilityMode(mode);
  }

  // Notify document that the load is beginning
  mDocument->BeginLoad();

  return NS_OK;
}

NS_IMETHODIMP
HTMLContentSink::DidBuildModel(bool aTerminated)
{
  DidBuildModelImpl(aTerminated);

  // Reflow the last batch of content
  if (mBody) {
    mCurrentContext->FlushTags();
  } else if (!mLayoutStarted) {
    // We never saw the body, and layout never got started. Force
    // layout *now*, to get an initial reflow.
    // NOTE: only force the layout if we are NOT destroying the
    // docshell. If we are destroying it, then starting layout will
    // likely cause us to crash, or at best waste a lot of time as we
    // are just going to tear it down anyway.
    bool bDestroying = true;
    if (mDocShell) {
      mDocShell->IsBeingDestroyed(&bDestroying);
    }

    if (!bDestroying) {
      StartLayout(false);
    }
  }

  ScrollToRef();

  // Make sure we no longer respond to document mutations.  We've flushed all
  // our notifications out, so there's no need to do anything else here.

  // XXXbz I wonder whether we could End() our contexts here too, or something,
  // just to make sure we no longer notify...  Or is the mIsDocumentObserver
  // thing sufficient?
  mDocument->RemoveObserver(this);
  mIsDocumentObserver = false;

  mDocument->EndLoad();

  DropParserAndPerfHint();

  return NS_OK;
}

NS_IMETHODIMP
HTMLContentSink::SetParser(nsParserBase* aParser)
{
  NS_PRECONDITION(aParser, "Should have a parser here!");
  mParser = aParser;
  return NS_OK;
}

nsresult
HTMLContentSink::CloseHTML()
{
  if (mHeadContext) {
    if (mCurrentContext == mHeadContext) {
      uint32_t numContexts = mContextStack.Length();

      // Pop off the second html context if it's not done earlier
      mCurrentContext = mContextStack.ElementAt(--numContexts);
      mContextStack.RemoveElementAt(numContexts);
    }

    mHeadContext->End();

    delete mHeadContext;
    mHeadContext = nullptr;
  }

  return NS_OK;
}

nsresult
HTMLContentSink::OpenBody()
{
  CloseHeadContext();  // do this just in case if the HEAD was left open!

  // if we already have a body we're done
  if (mBody) {
    return NS_OK;
  }

  nsresult rv = mCurrentContext->OpenBody();

  if (NS_FAILED(rv)) {
    return rv;
  }

  mBody = mCurrentContext->mStack[mCurrentContext->mStackPos - 1].mContent;

  if (mCurrentContext->mStackPos > 1) {
    int32_t parentIndex    = mCurrentContext->mStackPos - 2;
    nsGenericHTMLElement *parent = mCurrentContext->mStack[parentIndex].mContent;
    int32_t numFlushed     = mCurrentContext->mStack[parentIndex].mNumFlushed;
    int32_t childCount = parent->GetChildCount();
    NS_ASSERTION(numFlushed < childCount, "Already notified on the body?");

    int32_t insertionPoint =
      mCurrentContext->mStack[parentIndex].mInsertionPoint;

    // XXX: I have yet to see a case where numFlushed is non-zero and
    // insertionPoint is not -1, but this code will try to handle
    // those cases too.

    uint32_t oldUpdates = mUpdatesInNotification;
    mUpdatesInNotification = 0;
    if (insertionPoint != -1) {
      NotifyInsert(parent, mBody, insertionPoint - 1);
    } else {
      NotifyAppend(parent, numFlushed);
    }
    mCurrentContext->mStack[parentIndex].mNumFlushed = childCount;
    if (mUpdatesInNotification > 1) {
      UpdateChildCounts();
    }
    mUpdatesInNotification = oldUpdates;
  }

  StartLayout(false);

  return NS_OK;
}

nsresult
HTMLContentSink::CloseBody()
{
  // Flush out anything that's left
  mCurrentContext->FlushTags();
  mCurrentContext->CloseBody();

  return NS_OK;
}

NS_IMETHODIMP
HTMLContentSink::OpenContainer(ElementType aElementType)
{
  nsresult rv = NS_OK;

  switch (aElementType) {
    case eBody:
      rv = OpenBody();
      break;
    case eHTML:
      if (mRoot) {
        // If we've already hit this code once, then we're done
        if (!mNotifiedRootInsertion) {
          NotifyRootInsertion();
        }
        ProcessOfflineManifest(mRoot);
      }
      break;
  }

  return rv;
}

NS_IMETHODIMP
HTMLContentSink::CloseContainer(const ElementType aTag)
{
  nsresult rv = NS_OK;

  switch (aTag) {
    case eBody:
      rv = CloseBody();
      break;
    case eHTML:
      rv = CloseHTML();
      break;
  }

  return rv;
}

NS_IMETHODIMP
HTMLContentSink::WillInterrupt()
{
  return WillInterruptImpl();
}

NS_IMETHODIMP
HTMLContentSink::WillResume()
{
  return WillResumeImpl();
}

void
HTMLContentSink::CloseHeadContext()
{
  if (mCurrentContext) {
    if (!mCurrentContext->IsCurrentContainer(eHTMLTag_head))
      return;

    mCurrentContext->FlushTags();
  }

  if (!mContextStack.IsEmpty())
  {
    uint32_t n = mContextStack.Length() - 1;
    mCurrentContext = mContextStack.ElementAt(n);
    mContextStack.RemoveElementAt(n);
  }
}

void
HTMLContentSink::NotifyInsert(nsIContent* aContent,
                              nsIContent* aChildContent,
                              int32_t aIndexInContainer)
{
  if (aContent && aContent->GetUncomposedDoc() != mDocument) {
    // aContent is not actually in our document anymore.... Just bail out of
    // here; notifying on our document for this insert would be wrong.
    return;
  }

  mInNotification++;

  {
    // Scope so we call EndUpdate before we decrease mInNotification
    MOZ_AUTO_DOC_UPDATE(mDocument, UPDATE_CONTENT_MODEL, !mBeganUpdate);
    nsNodeUtils::ContentInserted(NODE_FROM(aContent, mDocument),
                                 aChildContent, aIndexInContainer);
    mLastNotificationTime = PR_Now();
  }

  mInNotification--;
}

void
HTMLContentSink::NotifyRootInsertion()
{
  NS_PRECONDITION(!mNotifiedRootInsertion, "Double-notifying on root?");
  NS_ASSERTION(!mLayoutStarted,
               "How did we start layout without notifying on root?");
  // Now make sure to notify that we have now inserted our root.  If
  // there has been no initial reflow yet it'll be a no-op, but if
  // there has been one we need this to get its frames constructed.
  // Note that if mNotifiedRootInsertion is true we don't notify here,
  // since that just means there are multiple <html> tags in the
  // document; in those cases we just want to put all the attrs on one
  // tag.
  mNotifiedRootInsertion = true;
  int32_t index = mDocument->IndexOf(mRoot);
  NS_ASSERTION(index != -1, "mRoot not child of document?");
  NotifyInsert(nullptr, mRoot, index);

  // Now update the notification information in all our
  // contexts, since we just inserted the root and notified on
  // our whole tree
  UpdateChildCounts();
}

void
HTMLContentSink::UpdateChildCounts()
{
  uint32_t numContexts = mContextStack.Length();
  for (uint32_t i = 0; i < numContexts; i++) {
    SinkContext* sc = mContextStack.ElementAt(i);

    sc->UpdateChildCounts();
  }

  mCurrentContext->UpdateChildCounts();
}

void
HTMLContentSink::FlushPendingNotifications(mozFlushType aType)
{
  // Only flush tags if we're not doing the notification ourselves
  // (since we aren't reentrant)
  if (!mInNotification) {
    // Only flush if we're still a document observer (so that our child counts
    // should be correct).
    if (mIsDocumentObserver) {
      if (aType >= Flush_ContentAndNotify) {
        FlushTags();
      }
    }
    if (aType >= Flush_InterruptibleLayout) {
      // Make sure that layout has started so that the reflow flush
      // will actually happen.
      StartLayout(true);
    }
  }
}

nsresult
HTMLContentSink::FlushTags()
{
  if (!mNotifiedRootInsertion) {
    NotifyRootInsertion();
    return NS_OK;
  }

  return mCurrentContext ? mCurrentContext->FlushTags() : NS_OK;
}

NS_IMETHODIMP
HTMLContentSink::SetDocumentCharset(nsACString& aCharset)
{
  MOZ_ASSERT_UNREACHABLE("<meta charset> case doesn't occur with about:blank");
  return NS_ERROR_NOT_IMPLEMENTED;
}

nsISupports *
HTMLContentSink::GetTarget()
{
  return mDocument;
}

bool
HTMLContentSink::IsScriptExecuting()
{
  return IsScriptExecutingImpl();
}