summaryrefslogtreecommitdiffstats
path: root/layout/inspector/inDOMUtils.cpp
blob: 800201ce212fd749ee3ffcafe2ecd586d09af5f1 (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
/* -*- Mode: C++; tab-width: 2; 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/. */

#include "mozilla/ArrayUtils.h"
#include "mozilla/EventStates.h"

#include "inDOMUtils.h"
#include "inLayoutUtils.h"

#include "nsArray.h"
#include "nsAutoPtr.h"
#include "nsIServiceManager.h"
#include "nsString.h"
#include "nsIStyleSheetLinkingElement.h"
#include "nsIContentInlines.h"
#include "nsIDOMElement.h"
#include "nsIDocument.h"
#include "nsIPresShell.h"
#include "nsIDOMDocument.h"
#include "nsIDOMCharacterData.h"
#include "nsRuleNode.h"
#include "nsIStyleRule.h"
#include "mozilla/css/StyleRule.h"
#include "nsICSSStyleRuleDOMWrapper.h"
#include "nsIDOMWindow.h"
#include "nsXBLBinding.h"
#include "nsXBLPrototypeBinding.h"
#include "nsIMutableArray.h"
#include "nsBindingManager.h"
#include "ChildIterator.h"
#include "nsComputedDOMStyle.h"
#include "mozilla/EventStateManager.h"
#include "nsIAtom.h"
#include "nsRange.h"
#include "nsContentList.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/dom/Element.h"
#include "nsRuleWalker.h"
#include "nsRuleProcessorData.h"
#include "nsCSSPseudoClasses.h"
#include "nsCSSRuleProcessor.h"
#include "mozilla/dom/CSSLexer.h"
#include "mozilla/dom/InspectorUtilsBinding.h"
#include "mozilla/dom/ToJSValue.h"
#include "nsCSSParser.h"
#include "nsCSSProps.h"
#include "nsCSSValue.h"
#include "nsColor.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "nsStyleUtil.h"
#include "nsQueryObject.h"

using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;

///////////////////////////////////////////////////////////////////////////////

inDOMUtils::inDOMUtils()
{
}

inDOMUtils::~inDOMUtils()
{
}

NS_IMPL_ISUPPORTS(inDOMUtils, inIDOMUtils)

///////////////////////////////////////////////////////////////////////////////
// inIDOMUtils

NS_IMETHODIMP
inDOMUtils::GetAllStyleSheets(nsIDOMDocument *aDocument, uint32_t *aLength,
                              nsISupports ***aSheets)
{
  NS_ENSURE_ARG_POINTER(aDocument);

  nsTArray<RefPtr<StyleSheet>> sheets;

  nsCOMPtr<nsIDocument> document = do_QueryInterface(aDocument);
  MOZ_ASSERT(document);

  // Get the agent, then user and finally xbl sheets in the style set.
  nsIPresShell* presShell = document->GetShell();

  if (presShell) {
    StyleSetHandle styleSet = presShell->StyleSet();
    SheetType sheetType = SheetType::Agent;
    for (int32_t i = 0; i < styleSet->SheetCount(sheetType); i++) {
      sheets.AppendElement(styleSet->StyleSheetAt(sheetType, i));
    }
    sheetType = SheetType::User;
    for (int32_t i = 0; i < styleSet->SheetCount(sheetType); i++) {
      sheets.AppendElement(styleSet->StyleSheetAt(sheetType, i));
    }
    if (styleSet->IsGecko()) {
      AutoTArray<CSSStyleSheet*, 32> xblSheetArray;
      styleSet->AsGecko()->AppendAllXBLStyleSheets(xblSheetArray);

      // The XBL stylesheet array will quite often be full of duplicates. Cope:
      nsTHashtable<nsPtrHashKey<CSSStyleSheet>> sheetSet;
      for (CSSStyleSheet* sheet : xblSheetArray) {
        if (!sheetSet.Contains(sheet)) {
          sheetSet.PutEntry(sheet);
          sheets.AppendElement(sheet);
        }
      }
    } else {
      NS_WARNING("stylo: XBL style sheets not supported yet");
    }
  }

  // Get the document sheets.
  for (size_t i = 0; i < document->SheetCount(); i++) {
    sheets.AppendElement(document->SheetAt(i));
  }

  nsISupports** ret = static_cast<nsISupports**>(moz_xmalloc(sheets.Length() *
                                                 sizeof(nsISupports*)));

  for (size_t i = 0; i < sheets.Length(); i++) {
    NS_ADDREF(ret[i] = NS_ISUPPORTS_CAST(nsIDOMCSSStyleSheet*, sheets[i]));
  }

  *aLength = sheets.Length();
  *aSheets = ret;

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::IsIgnorableWhitespace(nsIDOMCharacterData *aDataNode,
                                  bool *aReturn)
{
  NS_PRECONDITION(aReturn, "Must have an out parameter");

  NS_ENSURE_ARG_POINTER(aDataNode);

  *aReturn = false;

  nsCOMPtr<nsIContent> content = do_QueryInterface(aDataNode);
  NS_ASSERTION(content, "Does not implement nsIContent!");

  if (!content->TextIsOnlyWhitespace()) {
    return NS_OK;
  }

  // Okay.  We have only white space.  Let's check the white-space
  // property now and make sure that this isn't preformatted text...
  nsIFrame* frame = content->GetPrimaryFrame();
  if (frame) {
    const nsStyleText* text = frame->StyleText();
    *aReturn = !text->WhiteSpaceIsSignificant();
  }
  else {
    // empty inter-tag text node without frame, e.g., in between <table>\n<tr>
    *aReturn = true;
  }

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetParentForNode(nsIDOMNode* aNode,
                             bool aShowingAnonymousContent,
                             nsIDOMNode** aParent)
{
  NS_ENSURE_ARG_POINTER(aNode);

  // First do the special cases -- document nodes and anonymous content
  nsCOMPtr<nsIDocument> doc(do_QueryInterface(aNode));
  nsCOMPtr<nsIDOMNode> parent;

  if (doc) {
    parent = inLayoutUtils::GetContainerFor(*doc);
  } else if (aShowingAnonymousContent) {
    nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
    if (content) {
      nsIContent* bparent = content->GetFlattenedTreeParent();
      parent = do_QueryInterface(bparent);
    }
  }

  if (!parent) {
    // Ok, just get the normal DOM parent node
    aNode->GetParentNode(getter_AddRefs(parent));
  }

  NS_IF_ADDREF(*aParent = parent);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetChildrenForNode(nsIDOMNode* aNode,
                               bool aShowingAnonymousContent,
                               nsIDOMNodeList** aChildren)
{
  NS_ENSURE_ARG_POINTER(aNode);
  NS_PRECONDITION(aChildren, "Must have an out parameter");

  nsCOMPtr<nsIDOMNodeList> kids;

  if (aShowingAnonymousContent) {
    nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
    if (content) {
      kids = content->GetChildren(nsIContent::eAllChildren);
    }
  }

  if (!kids) {
    aNode->GetChildNodes(getter_AddRefs(kids));
  }

  kids.forget(aChildren);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetCSSStyleRules(nsIDOMElement *aElement,
                             const nsAString& aPseudo,
                             nsIArrayExtensions **_retval)
{
  NS_ENSURE_ARG_POINTER(aElement);

  *_retval = nullptr;

  nsCOMPtr<nsIAtom> pseudoElt;
  if (!aPseudo.IsEmpty()) {
    pseudoElt = NS_Atomize(aPseudo);
  }

  nsRuleNode* ruleNode = nullptr;
  nsCOMPtr<Element> element = do_QueryInterface(aElement);
  NS_ENSURE_STATE(element);
  RefPtr<nsStyleContext> styleContext;
  GetRuleNodeForElement(element, pseudoElt, getter_AddRefs(styleContext), &ruleNode);
  if (!ruleNode) {
    // This can fail for elements that are not in the document or
    // if the document they're in doesn't have a presshell.  Bail out.
    return NS_OK;
  }

  AutoTArray<nsRuleNode*, 16> ruleNodes;
  while (!ruleNode->IsRoot()) {
    ruleNodes.AppendElement(ruleNode);
    ruleNode = ruleNode->GetParent();
  }

  nsCOMPtr<nsIMutableArray> rules = nsArray::Create();
  for (nsRuleNode* ruleNode : Reversed(ruleNodes)) {
    RefPtr<Declaration> decl = do_QueryObject(ruleNode->GetRule());
    if (decl) {
      RefPtr<mozilla::css::StyleRule> styleRule =
        do_QueryObject(decl->GetOwningRule());
      if (styleRule) {
        nsCOMPtr<nsIDOMCSSRule> domRule = styleRule->GetDOMRule();
        if (domRule) {
          rules->AppendElement(domRule, /*weak =*/ false);
        }
      }
    }
  }

  rules.forget(_retval);

  return NS_OK;
}

static already_AddRefed<StyleRule>
GetRuleFromDOMRule(nsIDOMCSSStyleRule *aRule, ErrorResult& rv)
{
  nsCOMPtr<nsICSSStyleRuleDOMWrapper> rule = do_QueryInterface(aRule);
  if (!rule) {
    rv.Throw(NS_ERROR_INVALID_POINTER);
    return nullptr;
  }

  RefPtr<StyleRule> cssrule;
  rv = rule->GetCSSStyleRule(getter_AddRefs(cssrule));
  if (rv.Failed()) {
    return nullptr;
  }

  if (!cssrule) {
    rv.Throw(NS_ERROR_FAILURE);
  }
  return cssrule.forget();
}

NS_IMETHODIMP
inDOMUtils::GetRuleLine(nsIDOMCSSRule* aRule, uint32_t* _retval)
{
  NS_ENSURE_ARG_POINTER(aRule);

  Rule* rule = aRule->GetCSSRule();
  if (!rule) {
    return NS_ERROR_FAILURE;
  }

  *_retval = rule->GetLineNumber();
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetRuleColumn(nsIDOMCSSRule* aRule, uint32_t* _retval)
{
  NS_ENSURE_ARG_POINTER(aRule);

  Rule* rule = aRule->GetCSSRule();
  if (!rule) {
    return NS_ERROR_FAILURE;
  }

  *_retval = rule->GetColumnNumber();
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetRelativeRuleLine(nsIDOMCSSRule* aRule, uint32_t* _retval)
{
  NS_ENSURE_ARG_POINTER(aRule);

  Rule* rule = aRule->GetCSSRule();
  if (!rule) {
    return NS_ERROR_FAILURE;
  }

  uint32_t lineNumber = rule->GetLineNumber();
  CSSStyleSheet* sheet = rule->GetStyleSheet();
  if (sheet && lineNumber != 0) {
    nsINode* owningNode = sheet->GetOwnerNode();
    if (owningNode) {
      nsCOMPtr<nsIStyleSheetLinkingElement> link =
        do_QueryInterface(owningNode);
      if (link) {
        lineNumber -= link->GetLineNumber() - 1;
      }
    }
  }

  *_retval = lineNumber;
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetCSSLexer(const nsAString& aText, JSContext* aCx,
                        JS::MutableHandleValue aResult)
{
  MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
  JS::Rooted<JSObject*> scope(aCx, JS::CurrentGlobalOrNull(aCx));
  nsAutoPtr<CSSLexer> lexer(new CSSLexer(aText));
  if (!WrapNewBindingNonWrapperCachedObject(aCx, scope, lexer, aResult)) {
    return NS_ERROR_FAILURE;
  }
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetSelectorCount(nsIDOMCSSStyleRule* aRule, uint32_t *aCount)
{
  ErrorResult rv;
  RefPtr<StyleRule> rule = GetRuleFromDOMRule(aRule, rv);
  if (rv.Failed()) {
    return rv.StealNSResult();
  }

  uint32_t count = 0;
  for (nsCSSSelectorList* sel = rule->Selector(); sel; sel = sel->mNext) {
    ++count;
  }
  *aCount = count;
  return NS_OK;
}

static nsCSSSelectorList*
GetSelectorAtIndex(nsIDOMCSSStyleRule* aRule, uint32_t aIndex, ErrorResult& rv)
{
  RefPtr<StyleRule> rule = GetRuleFromDOMRule(aRule, rv);
  if (rv.Failed()) {
    return nullptr;
  }

  for (nsCSSSelectorList* sel = rule->Selector(); sel;
       sel = sel->mNext, --aIndex) {
    if (aIndex == 0) {
      return sel;
    }
  }

  // Ran out of selectors
  rv.Throw(NS_ERROR_INVALID_ARG);
  return nullptr;
}

NS_IMETHODIMP
inDOMUtils::GetSelectorText(nsIDOMCSSStyleRule* aRule,
                            uint32_t aSelectorIndex,
                            nsAString& aText)
{
  ErrorResult rv;
  nsCSSSelectorList* sel = GetSelectorAtIndex(aRule, aSelectorIndex, rv);
  if (rv.Failed()) {
    return rv.StealNSResult();
  }

  RefPtr<StyleRule> rule = GetRuleFromDOMRule(aRule, rv);
  MOZ_ASSERT(!rv.Failed(), "How could we get a selector but not a rule?");

  sel->mSelectors->ToString(aText, rule->GetStyleSheet(), false);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetSpecificity(nsIDOMCSSStyleRule* aRule,
                            uint32_t aSelectorIndex,
                            uint64_t* aSpecificity)
{
  ErrorResult rv;
  nsCSSSelectorList* sel = GetSelectorAtIndex(aRule, aSelectorIndex, rv);
  if (rv.Failed()) {
    return rv.StealNSResult();
  }

  *aSpecificity = sel->mWeight;
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::SelectorMatchesElement(nsIDOMElement* aElement,
                                   nsIDOMCSSStyleRule* aRule,
                                   uint32_t aSelectorIndex,
                                   const nsAString& aPseudo,
                                   bool* aMatches)
{
  nsCOMPtr<Element> element = do_QueryInterface(aElement);
  NS_ENSURE_ARG_POINTER(element);

  ErrorResult rv;
  nsCSSSelectorList* tail = GetSelectorAtIndex(aRule, aSelectorIndex, rv);
  if (rv.Failed()) {
    return rv.StealNSResult();
  }

  // We want just the one list item, not the whole list tail
  nsAutoPtr<nsCSSSelectorList> sel(tail->Clone(false));

  // Do not attempt to match if a pseudo element is requested and this is not
  // a pseudo element selector, or vice versa.
  if (aPseudo.IsEmpty() == sel->mSelectors->IsPseudoElement()) {
    *aMatches = false;
    return NS_OK;
  }

  if (!aPseudo.IsEmpty()) {
    // We need to make sure that the requested pseudo element type
    // matches the selector pseudo element type before proceeding.
    nsCOMPtr<nsIAtom> pseudoElt = NS_Atomize(aPseudo);
    if (sel->mSelectors->PseudoType() != nsCSSPseudoElements::
          GetPseudoType(pseudoElt, CSSEnabledState::eIgnoreEnabledState)) {
      *aMatches = false;
      return NS_OK;
    }

    // We have a matching pseudo element, now remove it so we can compare
    // directly against |element| when proceeding into SelectorListMatches.
    // It's OK to do this - we just cloned sel and nothing else is using it.
    sel->RemoveRightmostSelector();
  }

  element->OwnerDoc()->FlushPendingLinkUpdates();
  // XXXbz what exactly should we do with visited state here?
  TreeMatchContext matchingContext(false,
                                   nsRuleWalker::eRelevantLinkUnvisited,
                                   element->OwnerDoc(),
                                   TreeMatchContext::eNeverMatchVisited);
  *aMatches = nsCSSRuleProcessor::SelectorListMatches(element, matchingContext,
                                                      sel);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::IsInheritedProperty(const nsAString &aPropertyName, bool *_retval)
{
  nsCSSPropertyID prop = nsCSSProps::
    LookupProperty(aPropertyName, CSSEnabledState::eIgnoreEnabledState);
  if (prop == eCSSProperty_UNKNOWN) {
    *_retval = false;
    return NS_OK;
  }

  if (prop == eCSSPropertyExtra_variable) {
    *_retval = true;
    return NS_OK;
  }

  if (nsCSSProps::IsShorthand(prop)) {
    prop = nsCSSProps::SubpropertyEntryFor(prop)[0];
  }

  nsStyleStructID sid = nsCSSProps::kSIDTable[prop];
  *_retval = !nsCachedStyleData::IsReset(sid);
  return NS_OK;
}

extern const char* const kCSSRawProperties[];

NS_IMETHODIMP
inDOMUtils::GetCSSPropertyNames(uint32_t aFlags, uint32_t* aCount,
                                char16_t*** aProps)
{
  // maxCount is the largest number of properties we could have; our actual
  // number might be smaller because properties might be disabled.
  uint32_t maxCount;
  if (aFlags & EXCLUDE_SHORTHANDS) {
    maxCount = eCSSProperty_COUNT_no_shorthands;
  } else {
    maxCount = eCSSProperty_COUNT;
  }

  if (aFlags & INCLUDE_ALIASES) {
    maxCount += (eCSSProperty_COUNT_with_aliases - eCSSProperty_COUNT);
  }

  char16_t** props =
    static_cast<char16_t**>(moz_xmalloc(maxCount * sizeof(char16_t*)));

#define DO_PROP(_prop)                                                      \
  PR_BEGIN_MACRO                                                            \
    nsCSSPropertyID cssProp = nsCSSPropertyID(_prop);                           \
    if (nsCSSProps::IsEnabled(cssProp, CSSEnabledState::eForAllContent)) {  \
      props[propCount] =                                                    \
        ToNewUnicode(nsDependentCString(kCSSRawProperties[_prop]));         \
      ++propCount;                                                          \
    }                                                                       \
  PR_END_MACRO

  // prop is the property id we're considering; propCount is how many properties
  // we've put into props so far.
  uint32_t prop = 0, propCount = 0;
  for ( ; prop < eCSSProperty_COUNT_no_shorthands; ++prop) {
    if (nsCSSProps::PropertyParseType(nsCSSPropertyID(prop)) !=
        CSS_PROPERTY_PARSE_INACCESSIBLE) {
      DO_PROP(prop);
    }
  }

  if (!(aFlags & EXCLUDE_SHORTHANDS)) {
    for ( ; prop < eCSSProperty_COUNT; ++prop) {
      // Some shorthands are also aliases
      if ((aFlags & INCLUDE_ALIASES) ||
          !nsCSSProps::PropHasFlags(nsCSSPropertyID(prop),
                                    CSS_PROPERTY_IS_ALIAS)) {
        DO_PROP(prop);
      }
    }
  }

  if (aFlags & INCLUDE_ALIASES) {
    for (prop = eCSSProperty_COUNT; prop < eCSSProperty_COUNT_with_aliases; ++prop) {
      DO_PROP(prop);
    }
  }

#undef DO_PROP

  *aCount = propCount;
  *aProps = props;

  return NS_OK;
}

static void InsertNoDuplicates(nsTArray<nsString>& aArray,
                               const nsAString& aString)
{
  size_t i = aArray.IndexOfFirstElementGt(aString);
  if (i > 0 && aArray[i-1].Equals(aString)) {
    return;
  }
  aArray.InsertElementAt(i, aString);
}

static void GetKeywordsForProperty(const nsCSSPropertyID aProperty,
                                   nsTArray<nsString>& aArray)
{
  if (nsCSSProps::IsShorthand(aProperty)) {
    // Shorthand props have no keywords.
    return;
  }
  const nsCSSProps::KTableEntry* keywordTable =
    nsCSSProps::kKeywordTableTable[aProperty];
  if (keywordTable) {
    for (size_t i = 0; keywordTable[i].mKeyword != eCSSKeyword_UNKNOWN; ++i) {
      nsCSSKeyword word = keywordTable[i].mKeyword;
      InsertNoDuplicates(aArray,
                         NS_ConvertASCIItoUTF16(nsCSSKeywords::GetStringValue(word)));
    }
  }
}

static void GetColorsForProperty(const uint32_t aParserVariant,
                                 nsTArray<nsString>& aArray)
{
  if (aParserVariant & VARIANT_COLOR) {
    // GetKeywordsForProperty and GetOtherValuesForProperty assume aArray is sorted,
    // and if aArray is not empty here, then it's not going to be sorted coming out.
    MOZ_ASSERT(aArray.Length() == 0);
    size_t size;
    const char * const *allColorNames = NS_AllColorNames(&size);
    nsString* utf16Names = aArray.AppendElements(size);
    for (size_t i = 0; i < size; i++) {
      CopyASCIItoUTF16(allColorNames[i], utf16Names[i]);
    }
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("currentColor"));
  }
  return;
}

static void GetOtherValuesForProperty(const uint32_t aParserVariant,
                                      nsTArray<nsString>& aArray)
{
  if (aParserVariant & VARIANT_AUTO) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("auto"));
  }
  if (aParserVariant & VARIANT_NORMAL) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("normal"));
  }
  if(aParserVariant & VARIANT_ALL) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("all"));
  }
  if (aParserVariant & VARIANT_NONE) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("none"));
  }
  if (aParserVariant & VARIANT_ELEMENT) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("-moz-element"));
  }
  if (aParserVariant & VARIANT_IMAGE_RECT) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("-moz-image-rect"));
  }
  if (aParserVariant & VARIANT_COLOR) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("rgb"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("hsl"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("rgba"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("hsla"));
  }
  if (aParserVariant & VARIANT_TIMING_FUNCTION) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("cubic-bezier"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("steps"));
  }
  if (aParserVariant & VARIANT_CALC) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("calc"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("-moz-calc"));
  }
  if (aParserVariant & VARIANT_URL) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("url"));
  }
  if (aParserVariant & VARIANT_GRADIENT) {
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("linear-gradient"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("radial-gradient"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("repeating-linear-gradient"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("repeating-radial-gradient"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("-moz-linear-gradient"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("-moz-radial-gradient"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("-moz-repeating-linear-gradient"));
    InsertNoDuplicates(aArray, NS_LITERAL_STRING("-moz-repeating-radial-gradient"));
  }
}

NS_IMETHODIMP
inDOMUtils::GetSubpropertiesForCSSProperty(const nsAString& aProperty,
                                           uint32_t* aLength,
                                           char16_t*** aValues)
{
  nsCSSPropertyID propertyID =
    nsCSSProps::LookupProperty(aProperty, CSSEnabledState::eForAllContent);

  if (propertyID == eCSSProperty_UNKNOWN) {
    return NS_ERROR_FAILURE;
  }

  if (propertyID == eCSSPropertyExtra_variable) {
    *aValues = static_cast<char16_t**>(moz_xmalloc(sizeof(char16_t*)));
    (*aValues)[0] = ToNewUnicode(aProperty);
    *aLength = 1;
    return NS_OK;
  }

  if (!nsCSSProps::IsShorthand(propertyID)) {
    *aValues = static_cast<char16_t**>(moz_xmalloc(sizeof(char16_t*)));
    (*aValues)[0] = ToNewUnicode(nsCSSProps::GetStringValue(propertyID));
    *aLength = 1;
    return NS_OK;
  }

  // Count up how many subproperties we have.
  size_t subpropCount = 0;
  for (const nsCSSPropertyID *props = nsCSSProps::SubpropertyEntryFor(propertyID);
       *props != eCSSProperty_UNKNOWN; ++props) {
    ++subpropCount;
  }

  *aValues =
    static_cast<char16_t**>(moz_xmalloc(subpropCount * sizeof(char16_t*)));
  *aLength = subpropCount;
  for (const nsCSSPropertyID *props = nsCSSProps::SubpropertyEntryFor(propertyID),
                           *props_start = props;
       *props != eCSSProperty_UNKNOWN; ++props) {
    (*aValues)[props-props_start] = ToNewUnicode(nsCSSProps::GetStringValue(*props));
  }
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::CssPropertyIsShorthand(const nsAString& aProperty, bool *_retval)
{
  nsCSSPropertyID propertyID =
    nsCSSProps::LookupProperty(aProperty, CSSEnabledState::eForAllContent);
  if (propertyID == eCSSProperty_UNKNOWN) {
    return NS_ERROR_FAILURE;
  }

  if (propertyID == eCSSPropertyExtra_variable) {
    *_retval = false;
  } else {
    *_retval = nsCSSProps::IsShorthand(propertyID);
  }
  return NS_OK;
}

// A helper function that determines whether the given property
// supports the given type.
static bool
PropertySupportsVariant(nsCSSPropertyID aPropertyID, uint32_t aVariant)
{
  if (nsCSSProps::IsShorthand(aPropertyID)) {
    // We need a special case for border here, because while it resets
    // border-image, it can't actually parse an image.
    if (aPropertyID == eCSSProperty_border) {
      return (aVariant & (VARIANT_COLOR | VARIANT_LENGTH)) != 0;
    }

    for (const nsCSSPropertyID* props = nsCSSProps::SubpropertyEntryFor(aPropertyID);
         *props != eCSSProperty_UNKNOWN; ++props) {
      if (PropertySupportsVariant(*props, aVariant)) {
        return true;
      }
    }
    return false;
  }

  // Properties that are parsed by functions must have their
  // attributes hand-maintained here.
  if (nsCSSProps::PropHasFlags(aPropertyID, CSS_PROPERTY_VALUE_PARSER_FUNCTION) ||
      nsCSSProps::PropertyParseType(aPropertyID) == CSS_PROPERTY_PARSE_FUNCTION) {
    // These must all be special-cased.
    uint32_t supported;
    switch (aPropertyID) {
      case eCSSProperty_border_image_slice:
      case eCSSProperty_grid_template:
      case eCSSProperty_grid:
        supported = VARIANT_PN;
        break;

      case eCSSProperty_border_image_outset:
        supported = VARIANT_LN;
        break;

      case eCSSProperty_border_image_width:
      case eCSSProperty_stroke_dasharray:
        supported = VARIANT_LPN;
        break;

      case eCSSProperty_border_top_left_radius:
      case eCSSProperty_border_top_right_radius:
      case eCSSProperty_border_bottom_left_radius:
      case eCSSProperty_border_bottom_right_radius:
      case eCSSProperty_background_position:
      case eCSSProperty_background_position_x:
      case eCSSProperty_background_position_y:
      case eCSSProperty_background_size:
      case eCSSProperty_mask_position:
      case eCSSProperty_mask_position_x:
      case eCSSProperty_mask_position_y:
      case eCSSProperty_mask_size:
      case eCSSProperty_grid_auto_columns:
      case eCSSProperty_grid_auto_rows:
      case eCSSProperty_grid_template_columns:
      case eCSSProperty_grid_template_rows:
      case eCSSProperty_object_position:
      case eCSSProperty_scroll_snap_coordinate:
      case eCSSProperty_scroll_snap_destination:
      case eCSSProperty_transform_origin:
      case eCSSProperty_perspective_origin:
      case eCSSProperty__moz_outline_radius_topLeft:
      case eCSSProperty__moz_outline_radius_topRight:
      case eCSSProperty__moz_outline_radius_bottomLeft:
      case eCSSProperty__moz_outline_radius_bottomRight:
        supported = VARIANT_LP;
        break;

      case eCSSProperty_border_bottom_colors:
      case eCSSProperty_border_left_colors:
      case eCSSProperty_border_right_colors:
      case eCSSProperty_border_top_colors:
        supported = VARIANT_COLOR;
        break;

      case eCSSProperty_text_shadow:
      case eCSSProperty_box_shadow:
        supported = VARIANT_LENGTH | VARIANT_COLOR;
        break;

      case eCSSProperty_border_spacing:
        supported = VARIANT_LENGTH;
        break;

      case eCSSProperty_content:
      case eCSSProperty_cursor:
      case eCSSProperty_clip_path:
      case eCSSProperty_shape_outside:
        supported = VARIANT_URL;
        break;

      case eCSSProperty_fill:
      case eCSSProperty_stroke:
        supported = VARIANT_COLOR | VARIANT_URL;
        break;

      case eCSSProperty_image_orientation:
        supported = VARIANT_ANGLE;
        break;

      case eCSSProperty_filter:
        supported = VARIANT_URL;
        break;

      case eCSSProperty_grid_column_start:
      case eCSSProperty_grid_column_end:
      case eCSSProperty_grid_row_start:
      case eCSSProperty_grid_row_end:
      case eCSSProperty_font_weight:
      case eCSSProperty_initial_letter:
        supported = VARIANT_NUMBER;
        break;

      default:
        supported = 0;
        break;
    }

    return (supported & aVariant) != 0;
  }

  return (nsCSSProps::ParserVariant(aPropertyID) & aVariant) != 0;
}

NS_IMETHODIMP
inDOMUtils::CssPropertySupportsType(const nsAString& aProperty, uint32_t aType,
                                    bool *_retval)
{
  nsCSSPropertyID propertyID =
    nsCSSProps::LookupProperty(aProperty, CSSEnabledState::eForAllContent);
  if (propertyID == eCSSProperty_UNKNOWN) {
    return NS_ERROR_FAILURE;
  }

  if (propertyID >= eCSSProperty_COUNT) {
    *_retval = false;
    return NS_OK;
  }

  uint32_t variant;
  switch (aType) {
  case TYPE_LENGTH:
    variant = VARIANT_LENGTH;
    break;
  case TYPE_PERCENTAGE:
    variant = VARIANT_PERCENT;
    break;
  case TYPE_COLOR:
    variant = VARIANT_COLOR;
    break;
  case TYPE_URL:
    variant = VARIANT_URL;
    break;
  case TYPE_ANGLE:
    variant = VARIANT_ANGLE;
    break;
  case TYPE_FREQUENCY:
    variant = VARIANT_FREQUENCY;
    break;
  case TYPE_TIME:
    variant = VARIANT_TIME;
    break;
  case TYPE_GRADIENT:
    variant = VARIANT_GRADIENT;
    break;
  case TYPE_TIMING_FUNCTION:
    variant = VARIANT_TIMING_FUNCTION;
    break;
  case TYPE_IMAGE_RECT:
    variant = VARIANT_IMAGE_RECT;
    break;
  case TYPE_NUMBER:
    // Include integers under "number"?
    variant = VARIANT_NUMBER | VARIANT_INTEGER | VARIANT_OPACITY;
    break;
  default:
    // Unknown type
    return NS_ERROR_NOT_AVAILABLE;
  }

  *_retval = PropertySupportsVariant(propertyID, variant);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetCSSValuesForProperty(const nsAString& aProperty,
                                    uint32_t* aLength,
                                    char16_t*** aValues)
{
  nsCSSPropertyID propertyID = nsCSSProps::
    LookupProperty(aProperty, CSSEnabledState::eForAllContent);
  if (propertyID == eCSSProperty_UNKNOWN) {
    return NS_ERROR_FAILURE;
  }

  nsTArray<nsString> array;
  // We start collecting the values, BUT colors need to go in first, because array
  // needs to stay sorted, and the colors are sorted, so we just append them.
  if (propertyID == eCSSPropertyExtra_variable) {
    // No other values we can report.
  } else if (!nsCSSProps::IsShorthand(propertyID)) {
    // Property is longhand.
    uint32_t propertyParserVariant = nsCSSProps::ParserVariant(propertyID);
    // Get colors first.
    GetColorsForProperty(propertyParserVariant, array);
    if (propertyParserVariant & VARIANT_KEYWORD) {
      GetKeywordsForProperty(propertyID, array);
    }
    GetOtherValuesForProperty(propertyParserVariant, array);
  } else {
    // Property is shorthand.
    CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(subproperty, propertyID,
                                         CSSEnabledState::eForAllContent) {
      // Get colors (once) first.
      uint32_t propertyParserVariant = nsCSSProps::ParserVariant(*subproperty);
      if (propertyParserVariant & VARIANT_COLOR) {
        GetColorsForProperty(propertyParserVariant, array);
        break;
      }
    }
    CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(subproperty, propertyID,
                                         CSSEnabledState::eForAllContent) {
      uint32_t propertyParserVariant = nsCSSProps::ParserVariant(*subproperty);
      if (propertyParserVariant & VARIANT_KEYWORD) {
        GetKeywordsForProperty(*subproperty, array);
      }
      GetOtherValuesForProperty(propertyParserVariant, array);
    }
  }
  // All CSS properties take initial, inherit and unset.
  InsertNoDuplicates(array, NS_LITERAL_STRING("initial"));
  InsertNoDuplicates(array, NS_LITERAL_STRING("inherit"));
  InsertNoDuplicates(array, NS_LITERAL_STRING("unset"));

  *aLength = array.Length();
  char16_t** ret =
    static_cast<char16_t**>(moz_xmalloc(*aLength * sizeof(char16_t*)));
  for (uint32_t i = 0; i < *aLength; ++i) {
    ret[i] = ToNewUnicode(array[i]);
  }
  *aValues = ret;
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::ColorNameToRGB(const nsAString& aColorName, JSContext* aCx,
                           JS::MutableHandle<JS::Value> aValue)
{
  nscolor color;
  if (!NS_ColorNameToRGB(aColorName, &color)) {
    return NS_ERROR_INVALID_ARG;
  }

  InspectorRGBTriple triple;
  triple.mR = NS_GET_R(color);
  triple.mG = NS_GET_G(color);
  triple.mB = NS_GET_B(color);

  if (!ToJSValue(aCx, triple, aValue)) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::RgbToColorName(uint8_t aR, uint8_t aG, uint8_t aB,
                           nsAString& aColorName)
{
  const char* color = NS_RGBToColorName(NS_RGB(aR, aG, aB));
  if (!color) {
    aColorName.Truncate();
    return NS_ERROR_INVALID_ARG;
  }

  aColorName.AssignASCII(color);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::ColorToRGBA(const nsAString& aColorString, JSContext* aCx,
                        JS::MutableHandle<JS::Value> aValue)
{
  nscolor color = 0;
  nsCSSParser cssParser;
  nsCSSValue cssValue;

  bool isColor = cssParser.ParseColorString(aColorString, nullptr, 0,
                                            cssValue, true);

  if (!isColor) {
    aValue.setNull();
    return NS_OK;
  }

  nsRuleNode::ComputeColor(cssValue, nullptr, nullptr, color);

  InspectorRGBATuple tuple;
  tuple.mR = NS_GET_R(color);
  tuple.mG = NS_GET_G(color);
  tuple.mB = NS_GET_B(color);
  tuple.mA = nsStyleUtil::ColorComponentToFloat(NS_GET_A(color));

  if (!ToJSValue(aCx, tuple, aValue)) {
    return NS_ERROR_FAILURE;
  }

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::IsValidCSSColor(const nsAString& aColorString, bool *_retval)
{
  nsCSSParser cssParser;
  nsCSSValue cssValue;
  *_retval = cssParser.ParseColorString(aColorString, nullptr, 0, cssValue, true);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::CssPropertyIsValid(const nsAString& aPropertyName,
                               const nsAString& aPropertyValue,
                               bool *_retval)
{
  nsCSSPropertyID propertyID = nsCSSProps::
    LookupProperty(aPropertyName, CSSEnabledState::eIgnoreEnabledState);

  if (propertyID == eCSSProperty_UNKNOWN) {
    *_retval = false;
    return NS_OK;
  }

  if (propertyID == eCSSPropertyExtra_variable) {
    *_retval = true;
    return NS_OK;
  }

  // Get a parser, parse the property.
  nsCSSParser parser;
  *_retval = parser.IsValueValidForProperty(propertyID, aPropertyValue);

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetBindingURLs(nsIDOMElement *aElement, nsIArray **_retval)
{
  NS_ENSURE_ARG_POINTER(aElement);

  *_retval = nullptr;

  nsCOMPtr<nsIMutableArray> urls = do_CreateInstance(NS_ARRAY_CONTRACTID);
  if (!urls)
    return NS_ERROR_FAILURE;

  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
  NS_ENSURE_ARG_POINTER(content);

  nsXBLBinding *binding = content->GetXBLBinding();

  while (binding) {
    urls->AppendElement(binding->PrototypeBinding()->BindingURI(), false);
    binding = binding->GetBaseBinding();
  }

  urls.forget(_retval);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::SetContentState(nsIDOMElement* aElement,
                            EventStates::InternalType aState,
                            bool* aRetVal)
{
  NS_ENSURE_ARG_POINTER(aElement);

  RefPtr<EventStateManager> esm =
    inLayoutUtils::GetEventStateManagerFor(aElement);
  NS_ENSURE_TRUE(esm, NS_ERROR_INVALID_ARG);

  nsCOMPtr<nsIContent> content;
  content = do_QueryInterface(aElement);
  NS_ENSURE_TRUE(content, NS_ERROR_INVALID_ARG);

  *aRetVal = esm->SetContentState(content, EventStates(aState));
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::RemoveContentState(nsIDOMElement* aElement,
                               EventStates::InternalType aState,
                               bool* aRetVal)
{
  NS_ENSURE_ARG_POINTER(aElement);

  RefPtr<EventStateManager> esm =
    inLayoutUtils::GetEventStateManagerFor(aElement);
  NS_ENSURE_TRUE(esm, NS_ERROR_INVALID_ARG);

  *aRetVal = esm->SetContentState(nullptr, EventStates(aState));
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetContentState(nsIDOMElement* aElement,
                            EventStates::InternalType* aState)
{
  *aState = 0;
  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
  NS_ENSURE_ARG_POINTER(content);

  // NOTE: if this method is removed,
  // please remove GetInternalValue from EventStates
  *aState = content->AsElement()->State().GetInternalValue();
  return NS_OK;
}

/* static */ nsresult
inDOMUtils::GetRuleNodeForElement(dom::Element* aElement,
                                  nsIAtom* aPseudo,
                                  nsStyleContext** aStyleContext,
                                  nsRuleNode** aRuleNode)
{
  MOZ_ASSERT(aElement);

  *aRuleNode = nullptr;
  *aStyleContext = nullptr;

  nsIDocument* doc = aElement->GetComposedDoc();
  NS_ENSURE_TRUE(doc, NS_ERROR_UNEXPECTED);

  nsIPresShell *presShell = doc->GetShell();
  NS_ENSURE_TRUE(presShell, NS_ERROR_UNEXPECTED);

  nsPresContext *presContext = presShell->GetPresContext();
  NS_ENSURE_TRUE(presContext, NS_ERROR_UNEXPECTED);

  presContext->EnsureSafeToHandOutCSSRules();

  RefPtr<nsStyleContext> sContext =
    nsComputedDOMStyle::GetStyleContextForElement(aElement, aPseudo, presShell);
  if (sContext) {
    *aRuleNode = sContext->RuleNode();
    sContext.forget(aStyleContext);
  }
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::GetUsedFontFaces(nsIDOMRange* aRange,
                             nsIDOMFontFaceList** aFontFaceList)
{
  return static_cast<nsRange*>(aRange)->GetUsedFontFaces(aFontFaceList);
}

static EventStates
GetStatesForPseudoClass(const nsAString& aStatePseudo)
{
  // An array of the states that are relevant for various pseudoclasses.
  // XXXbz this duplicates code in nsCSSRuleProcessor
  static const EventStates sPseudoClassStates[] = {
#define CSS_PSEUDO_CLASS(_name, _value, _flags, _pref) \
    EventStates(),
#define CSS_STATE_PSEUDO_CLASS(_name, _value, _flags, _pref, _states) \
    _states,
#include "nsCSSPseudoClassList.h"
#undef CSS_STATE_PSEUDO_CLASS
#undef CSS_PSEUDO_CLASS

    // Add more entries for our fake values to make sure we can't
    // index out of bounds into this array no matter what.
    EventStates(),
    EventStates()
  };
  static_assert(MOZ_ARRAY_LENGTH(sPseudoClassStates) ==
                static_cast<size_t>(CSSPseudoClassType::MAX),
                "Length of PseudoClassStates array is incorrect");

  nsCOMPtr<nsIAtom> atom = NS_Atomize(aStatePseudo);
  CSSPseudoClassType type = nsCSSPseudoClasses::
    GetPseudoType(atom, CSSEnabledState::eIgnoreEnabledState);

  // Ignore :any-link so we don't give the element simultaneous
  // visited and unvisited style state
  if (type == CSSPseudoClassType::anyLink ||
      type == CSSPseudoClassType::mozAnyLink) {
    return EventStates();
  }
  // Our array above is long enough that indexing into it with
  // NotPseudo is ok.
  return sPseudoClassStates[static_cast<CSSPseudoClassTypeBase>(type)];
}

NS_IMETHODIMP
inDOMUtils::GetCSSPseudoElementNames(uint32_t* aLength, char16_t*** aNames)
{
  nsTArray<nsIAtom*> array;

  const CSSPseudoElementTypeBase pseudoCount =
    static_cast<CSSPseudoElementTypeBase>(CSSPseudoElementType::Count);
  for (CSSPseudoElementTypeBase i = 0; i < pseudoCount; ++i) {
    CSSPseudoElementType type = static_cast<CSSPseudoElementType>(i);
    if (nsCSSPseudoElements::IsEnabled(type, CSSEnabledState::eForAllContent)) {
      nsIAtom* atom = nsCSSPseudoElements::GetPseudoAtom(type);
      array.AppendElement(atom);
    }
  }

  *aLength = array.Length();
  char16_t** ret =
    static_cast<char16_t**>(moz_xmalloc(*aLength * sizeof(char16_t*)));
  for (uint32_t i = 0; i < *aLength; ++i) {
    ret[i] = ToNewUnicode(nsDependentAtomString(array[i]));
  }
  *aNames = ret;
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::AddPseudoClassLock(nsIDOMElement *aElement,
                               const nsAString &aPseudoClass)
{
  EventStates state = GetStatesForPseudoClass(aPseudoClass);
  if (state.IsEmpty()) {
    return NS_OK;
  }

  nsCOMPtr<mozilla::dom::Element> element = do_QueryInterface(aElement);
  NS_ENSURE_ARG_POINTER(element);

  element->LockStyleStates(state);

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::RemovePseudoClassLock(nsIDOMElement *aElement,
                                  const nsAString &aPseudoClass)
{
  EventStates state = GetStatesForPseudoClass(aPseudoClass);
  if (state.IsEmpty()) {
    return NS_OK;
  }

  nsCOMPtr<mozilla::dom::Element> element = do_QueryInterface(aElement);
  NS_ENSURE_ARG_POINTER(element);

  element->UnlockStyleStates(state);

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::HasPseudoClassLock(nsIDOMElement *aElement,
                               const nsAString &aPseudoClass,
                               bool *_retval)
{
  EventStates state = GetStatesForPseudoClass(aPseudoClass);
  if (state.IsEmpty()) {
    *_retval = false;
    return NS_OK;
  }

  nsCOMPtr<mozilla::dom::Element> element = do_QueryInterface(aElement);
  NS_ENSURE_ARG_POINTER(element);

  EventStates locks = element->LockedStyleStates();

  *_retval = locks.HasAllStates(state);
  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::ClearPseudoClassLocks(nsIDOMElement *aElement)
{
  nsCOMPtr<mozilla::dom::Element> element = do_QueryInterface(aElement);
  NS_ENSURE_ARG_POINTER(element);

  element->ClearStyleStateLocks();

  return NS_OK;
}

NS_IMETHODIMP
inDOMUtils::ParseStyleSheet(nsIDOMCSSStyleSheet *aSheet,
                            const nsAString& aInput)
{
  RefPtr<CSSStyleSheet> sheet = do_QueryObject(aSheet);
  NS_ENSURE_ARG_POINTER(sheet);

  return sheet->ReparseSheet(aInput);
}

NS_IMETHODIMP
inDOMUtils::ScrollElementIntoView(nsIDOMElement *aElement)
{
  nsCOMPtr<nsIContent> content = do_QueryInterface(aElement);
  NS_ENSURE_ARG_POINTER(content);

  nsIPresShell* presShell = content->OwnerDoc()->GetShell();
  if (!presShell) {
    return NS_OK;
  }

  presShell->ScrollContentIntoView(content,
                                   nsIPresShell::ScrollAxis(),
                                   nsIPresShell::ScrollAxis(),
                                   nsIPresShell::SCROLL_OVERFLOW_HIDDEN);

  return NS_OK;
}