forked from mozilla/gecko-dev
-
Notifications
You must be signed in to change notification settings - Fork 2
/
nsStyleSet.cpp
1637 lines (1432 loc) · 54.5 KB
/
nsStyleSet.cpp
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
/* -*- 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/. */
/*
* the container for the style sheets that apply to a presentation, and
* the internal API that the style system exposes for creating (and
* potentially re-creating) style contexts
*/
#include "mozilla/Util.h"
#include "nsStyleSet.h"
#include "nsNetUtil.h"
#include "nsCSSStyleSheet.h"
#include "nsIDocument.h"
#include "nsRuleWalker.h"
#include "nsStyleContext.h"
#include "mozilla/css/StyleRule.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSRuleProcessor.h"
#include "nsIContent.h"
#include "nsRuleData.h"
#include "nsRuleProcessorData.h"
#include "nsTransitionManager.h"
#include "nsAnimationManager.h"
#include "nsEventStates.h"
#include "nsStyleSheetService.h"
#include "mozilla/dom/Element.h"
#include "sampler.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_ISUPPORTS1(nsEmptyStyleRule, nsIStyleRule)
/* virtual */ void
nsEmptyStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
}
#ifdef DEBUG
/* virtual */ void
nsEmptyStyleRule::List(FILE* out, int32_t aIndent) const
{
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("[empty style rule] {}\n", out);
}
#endif
NS_IMPL_ISUPPORTS1(nsInitialStyleRule, nsIStyleRule)
/* virtual */ void
nsInitialStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
// Iterate over the property groups
for (nsStyleStructID sid = nsStyleStructID(0);
sid < nsStyleStructID_Length; sid = nsStyleStructID(sid + 1)) {
if (aRuleData->mSIDs & (1 << sid)) {
// Iterate over nsCSSValues within the property group
nsCSSValue * const value_start =
aRuleData->mValueStorage + aRuleData->mValueOffsets[sid];
for (nsCSSValue *value = value_start,
*value_end = value + nsCSSProps::PropertyCountInStruct(sid);
value != value_end; ++value) {
// If MathML is disabled take care not to set MathML properties (or we
// will trigger assertions in nsRuleNode)
if (sid == eStyleStruct_Font &&
!aRuleData->mPresContext->Document()->GetMathMLEnabled()) {
size_t index = value - value_start;
if (index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_script_level) ||
index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_script_size_multiplier) ||
index == nsCSSProps::PropertyIndexInStruct(
eCSSProperty_script_min_size)) {
continue;
}
}
if (value->GetUnit() == eCSSUnit_Null) {
value->SetInitialValue();
}
}
}
}
}
#ifdef DEBUG
/* virtual */ void
nsInitialStyleRule::List(FILE* out, int32_t aIndent) const
{
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("[initial style rule] {}\n", out);
}
#endif
static const nsStyleSet::sheetType gCSSSheetTypes[] = {
nsStyleSet::eAgentSheet,
nsStyleSet::eUserSheet,
nsStyleSet::eDocSheet,
nsStyleSet::eOverrideSheet
};
nsStyleSet::nsStyleSet()
: mRuleTree(nullptr),
mBatching(0),
mInShutdown(false),
mAuthorStyleDisabled(false),
mInReconstruct(false),
mDirty(0),
mUnusedRuleNodeCount(0)
{
}
size_t
nsStyleSet::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
for (int i = 0; i < eSheetTypeCount; i++) {
if (mRuleProcessors[i]) {
n += mRuleProcessors[i]->SizeOfIncludingThis(aMallocSizeOf);
}
}
return n;
}
nsresult
nsStyleSet::Init(nsPresContext *aPresContext)
{
mFirstLineRule = new nsEmptyStyleRule;
mFirstLetterRule = new nsEmptyStyleRule;
mPlaceholderRule = new nsEmptyStyleRule;
mRuleTree = nsRuleNode::CreateRootNode(aPresContext);
GatherRuleProcessors(eAnimationSheet);
GatherRuleProcessors(eTransitionSheet);
return NS_OK;
}
nsresult
nsStyleSet::BeginReconstruct()
{
NS_ASSERTION(!mInReconstruct, "Unmatched begin/end?");
NS_ASSERTION(mRuleTree, "Reconstructing before first construction?");
// Create a new rule tree root
nsRuleNode* newTree =
nsRuleNode::CreateRootNode(mRuleTree->GetPresContext());
if (!newTree)
return NS_ERROR_OUT_OF_MEMORY;
// Save the old rule tree so we can destroy it later
if (!mOldRuleTrees.AppendElement(mRuleTree)) {
newTree->Destroy();
return NS_ERROR_OUT_OF_MEMORY;
}
// We need to keep mRoots so that the rule tree GC will only free the
// rule trees that really aren't referenced anymore (which should be
// all of them, if there are no bugs in reresolution code).
mInReconstruct = true;
mRuleTree = newTree;
return NS_OK;
}
void
nsStyleSet::EndReconstruct()
{
NS_ASSERTION(mInReconstruct, "Unmatched begin/end?");
mInReconstruct = false;
#ifdef DEBUG
for (int32_t i = mRoots.Length() - 1; i >= 0; --i) {
nsRuleNode *n = mRoots[i]->GetRuleNode();
while (n->GetParent()) {
n = n->GetParent();
}
// Since nsStyleContext's mParent and mRuleNode are immutable, and
// style contexts own their parents, and nsStyleContext asserts in
// its constructor that the style context and its parent are in the
// same rule tree, we don't need to check any of the children of
// mRoots; we only need to check the rule nodes of mRoots
// themselves.
NS_ASSERTION(n == mRuleTree, "style context has old rule node");
}
#endif
// This *should* destroy the only element of mOldRuleTrees, but in
// case of some bugs (which would trigger the above assertions), it
// won't.
GCRuleTrees();
}
void
nsStyleSet::SetQuirkStyleSheet(nsIStyleSheet* aQuirkStyleSheet)
{
NS_ASSERTION(aQuirkStyleSheet, "Must have quirk sheet if this is called");
NS_ASSERTION(!mQuirkStyleSheet, "Multiple calls to SetQuirkStyleSheet?");
NS_ASSERTION(mSheets[eAgentSheet].IndexOf(aQuirkStyleSheet) != -1,
"Quirk style sheet not one of our agent sheets?");
mQuirkStyleSheet = aQuirkStyleSheet;
}
nsresult
nsStyleSet::GatherRuleProcessors(sheetType aType)
{
mRuleProcessors[aType] = nullptr;
if (mAuthorStyleDisabled && (aType == eDocSheet ||
aType == ePresHintSheet ||
aType == eStyleAttrSheet)) {
//don't regather if this level is disabled
return NS_OK;
}
if (aType == eAnimationSheet) {
// We have no sheet for the animations level; just a rule
// processor. (XXX: We should probably do this for the other
// non-CSS levels too!)
mRuleProcessors[aType] = PresContext()->AnimationManager();
return NS_OK;
}
if (aType == eTransitionSheet) {
// We have no sheet for the transitions level; just a rule
// processor. (XXX: We should probably do this for the other
// non-CSS levels too!)
mRuleProcessors[aType] = PresContext()->TransitionManager();
return NS_OK;
}
if (mSheets[aType].Count()) {
switch (aType) {
case eAgentSheet:
case eUserSheet:
case eDocSheet:
case eOverrideSheet: {
// levels containing CSS stylesheets
nsCOMArray<nsIStyleSheet>& sheets = mSheets[aType];
nsTArray<nsRefPtr<nsCSSStyleSheet> > cssSheets(sheets.Count());
for (int32_t i = 0, i_end = sheets.Count(); i < i_end; ++i) {
nsRefPtr<nsCSSStyleSheet> cssSheet = do_QueryObject(sheets[i]);
NS_ASSERTION(cssSheet, "not a CSS sheet");
cssSheets.AppendElement(cssSheet);
}
mRuleProcessors[aType] = new nsCSSRuleProcessor(cssSheets,
uint8_t(aType));
} break;
default:
// levels containing non-CSS stylesheets
NS_ASSERTION(mSheets[aType].Count() == 1, "only one sheet per level");
mRuleProcessors[aType] = do_QueryInterface(mSheets[aType][0]);
break;
}
}
return NS_OK;
}
nsresult
nsStyleSet::AppendStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
mSheets[aType].RemoveObject(aSheet);
if (!mSheets[aType].AppendObject(aSheet))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::PrependStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
mSheets[aType].RemoveObject(aSheet);
if (!mSheets[aType].InsertObjectAt(aSheet, 0))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::RemoveStyleSheet(sheetType aType, nsIStyleSheet *aSheet)
{
NS_PRECONDITION(aSheet, "null arg");
NS_ASSERTION(aSheet->IsComplete(),
"Incomplete sheet being removed from style set");
mSheets[aType].RemoveObject(aSheet);
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::ReplaceSheets(sheetType aType,
const nsCOMArray<nsIStyleSheet> &aNewSheets)
{
mSheets[aType].Clear();
if (!mSheets[aType].AppendObjects(aNewSheets))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
nsresult
nsStyleSet::InsertStyleSheetBefore(sheetType aType, nsIStyleSheet *aNewSheet,
nsIStyleSheet *aReferenceSheet)
{
NS_PRECONDITION(aNewSheet && aReferenceSheet, "null arg");
NS_ASSERTION(aNewSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
mSheets[aType].RemoveObject(aNewSheet);
int32_t idx = mSheets[aType].IndexOf(aReferenceSheet);
if (idx < 0)
return NS_ERROR_INVALID_ARG;
if (!mSheets[aType].InsertObjectAt(aNewSheet, idx))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(aType);
mDirty |= 1 << aType;
return NS_OK;
}
bool
nsStyleSet::GetAuthorStyleDisabled()
{
return mAuthorStyleDisabled;
}
nsresult
nsStyleSet::SetAuthorStyleDisabled(bool aStyleDisabled)
{
if (aStyleDisabled == !mAuthorStyleDisabled) {
mAuthorStyleDisabled = aStyleDisabled;
BeginUpdate();
mDirty |= 1 << eDocSheet |
1 << ePresHintSheet |
1 << eStyleAttrSheet;
return EndUpdate();
}
return NS_OK;
}
// -------- Doc Sheets
nsresult
nsStyleSet::AddDocStyleSheet(nsIStyleSheet* aSheet, nsIDocument* aDocument)
{
NS_PRECONDITION(aSheet && aDocument, "null arg");
NS_ASSERTION(aSheet->IsApplicable(),
"Inapplicable sheet being placed in style set");
nsCOMArray<nsIStyleSheet>& docSheets = mSheets[eDocSheet];
docSheets.RemoveObject(aSheet);
nsStyleSheetService *sheetService = nsStyleSheetService::GetInstance();
// lowest index first
int32_t newDocIndex = aDocument->GetIndexOfStyleSheet(aSheet);
int32_t count = docSheets.Count();
int32_t index;
for (index = 0; index < count; index++) {
nsIStyleSheet* sheet = docSheets.ObjectAt(index);
int32_t sheetDocIndex = aDocument->GetIndexOfStyleSheet(sheet);
if (sheetDocIndex > newDocIndex)
break;
// If the sheet is not owned by the document it can be an author
// sheet registered at nsStyleSheetService or an additional author
// sheet on the document, which means the new
// doc sheet should end up before it.
if (sheetDocIndex < 0 &&
((sheetService &&
sheetService->AuthorStyleSheets()->IndexOf(sheet) >= 0) ||
sheet == aDocument->FirstAdditionalAuthorSheet()))
break;
}
if (!docSheets.InsertObjectAt(aSheet, index))
return NS_ERROR_OUT_OF_MEMORY;
if (!mBatching)
return GatherRuleProcessors(eDocSheet);
mDirty |= 1 << eDocSheet;
return NS_OK;
}
// Batching
void
nsStyleSet::BeginUpdate()
{
++mBatching;
}
nsresult
nsStyleSet::EndUpdate()
{
NS_ASSERTION(mBatching > 0, "Unbalanced EndUpdate");
if (--mBatching) {
// We're not completely done yet.
return NS_OK;
}
for (int i = 0; i < eSheetTypeCount; ++i) {
if (mDirty & (1 << i)) {
nsresult rv = GatherRuleProcessors(sheetType(i));
NS_ENSURE_SUCCESS(rv, rv);
}
}
mDirty = 0;
return NS_OK;
}
void
nsStyleSet::EnableQuirkStyleSheet(bool aEnable)
{
#ifdef DEBUG
bool oldEnabled;
{
nsCOMPtr<nsIDOMCSSStyleSheet> domSheet =
do_QueryInterface(mQuirkStyleSheet);
domSheet->GetDisabled(&oldEnabled);
oldEnabled = !oldEnabled;
}
#endif
mQuirkStyleSheet->SetEnabled(aEnable);
#ifdef DEBUG
// This should always be OK, since SetEnabled should call
// ClearRuleCascades.
// Note that we can hit this codepath multiple times when document.open()
// (potentially implied) happens multiple times.
if (mRuleProcessors[eAgentSheet] && aEnable != oldEnabled) {
static_cast<nsCSSRuleProcessor*>(static_cast<nsIStyleRuleProcessor*>(
mRuleProcessors[eAgentSheet]))->AssertQuirksChangeOK();
}
#endif
}
template<class T>
static bool
EnumRulesMatching(nsIStyleRuleProcessor* aProcessor, void* aData)
{
T* data = static_cast<T*>(aData);
aProcessor->RulesMatching(data);
return true;
}
static inline bool
IsMoreSpecificThanAnimation(nsRuleNode *aRuleNode)
{
return !aRuleNode->IsRoot() &&
(aRuleNode->GetLevel() == nsStyleSet::eTransitionSheet ||
aRuleNode->IsImportantRule());
}
static nsIStyleRule*
GetAnimationRule(nsRuleNode *aRuleNode)
{
nsRuleNode *n = aRuleNode;
while (IsMoreSpecificThanAnimation(n)) {
n = n->GetParent();
}
if (n->IsRoot() || n->GetLevel() != nsStyleSet::eAnimationSheet) {
return nullptr;
}
return n->GetRule();
}
static nsRuleNode*
ReplaceAnimationRule(nsRuleNode *aOldRuleNode,
nsIStyleRule *aOldAnimRule,
nsIStyleRule *aNewAnimRule)
{
nsTArray<nsRuleNode*> moreSpecificNodes;
nsRuleNode *n = aOldRuleNode;
while (IsMoreSpecificThanAnimation(n)) {
moreSpecificNodes.AppendElement(n);
n = n->GetParent();
}
if (aOldAnimRule) {
NS_ABORT_IF_FALSE(n->GetRule() == aOldAnimRule, "wrong rule");
NS_ABORT_IF_FALSE(n->GetLevel() == nsStyleSet::eAnimationSheet,
"wrong level");
n = n->GetParent();
}
NS_ABORT_IF_FALSE(!IsMoreSpecificThanAnimation(n) &&
(n->IsRoot() ||
n->GetLevel() != nsStyleSet::eAnimationSheet),
"wrong level");
if (aNewAnimRule) {
n = n->Transition(aNewAnimRule, nsStyleSet::eAnimationSheet, false);
}
for (uint32_t i = moreSpecificNodes.Length(); i-- != 0; ) {
nsRuleNode *oldNode = moreSpecificNodes[i];
n = n->Transition(oldNode->GetRule(), oldNode->GetLevel(),
oldNode->IsImportantRule());
}
return n;
}
/**
* |GetContext| implements sharing of style contexts (not just the data
* on the rule nodes) between siblings and cousins of the same
* generation. (It works for cousins of the same generation since
* |aParentContext| could itself be a shared context.)
*/
already_AddRefed<nsStyleContext>
nsStyleSet::GetContext(nsStyleContext* aParentContext,
nsRuleNode* aRuleNode,
// aVisitedRuleNode may be null; if it is null
// it means that we don't need to force creation
// of a StyleIfVisited. (But if we make one
// because aParentContext has one, then aRuleNode
// should be used.)
nsRuleNode* aVisitedRuleNode,
bool aIsLink,
bool aIsVisitedLink,
nsIAtom* aPseudoTag,
nsCSSPseudoElements::Type aPseudoType,
bool aDoAnimations,
Element* aElementForAnimation)
{
NS_PRECONDITION((!aPseudoTag &&
aPseudoType ==
nsCSSPseudoElements::ePseudo_NotPseudoElement) ||
(aPseudoTag &&
nsCSSPseudoElements::GetPseudoType(aPseudoTag) ==
aPseudoType),
"Pseudo mismatch");
if (aVisitedRuleNode == aRuleNode) {
// No need to force creation of a visited style in this case.
aVisitedRuleNode = nullptr;
}
// Ensure |aVisitedRuleNode != nullptr| corresponds to the need to
// create an if-visited style context, and that in that case, we have
// parentIfVisited set correctly.
nsStyleContext *parentIfVisited =
aParentContext ? aParentContext->GetStyleIfVisited() : nullptr;
if (parentIfVisited) {
if (!aVisitedRuleNode) {
aVisitedRuleNode = aRuleNode;
}
} else {
if (aVisitedRuleNode) {
parentIfVisited = aParentContext;
}
}
if (aIsLink) {
// If this node is a link, we want its visited's style context's
// parent to be the regular style context of its parent, because
// only the visitedness of the relevant link should influence style.
parentIfVisited = aParentContext;
}
nsRefPtr<nsStyleContext> result;
if (aParentContext)
result = aParentContext->FindChildWithRules(aPseudoTag, aRuleNode,
aVisitedRuleNode,
aIsVisitedLink);
#ifdef NOISY_DEBUG
if (result)
fprintf(stdout, "--- SharedSC %d ---\n", ++gSharedCount);
else
fprintf(stdout, "+++ NewSC %d +++\n", ++gNewCount);
#endif
if (!result) {
result = NS_NewStyleContext(aParentContext, aPseudoTag, aPseudoType,
aRuleNode);
if (!result)
return nullptr;
if (aVisitedRuleNode) {
nsRefPtr<nsStyleContext> resultIfVisited =
NS_NewStyleContext(parentIfVisited, aPseudoTag, aPseudoType,
aVisitedRuleNode);
if (!resultIfVisited) {
return nullptr;
}
if (!parentIfVisited) {
mRoots.AppendElement(resultIfVisited);
}
resultIfVisited->SetIsStyleIfVisited();
result->SetStyleIfVisited(resultIfVisited.forget());
bool relevantLinkVisited =
aIsLink ? aIsVisitedLink
: (aParentContext && aParentContext->RelevantLinkVisited());
if (relevantLinkVisited) {
result->AddStyleBit(NS_STYLE_RELEVANT_LINK_VISITED);
}
}
if (!aParentContext)
mRoots.AppendElement(result);
}
else {
NS_ASSERTION(result->GetPseudoType() == aPseudoType, "Unexpected type");
NS_ASSERTION(result->GetPseudo() == aPseudoTag, "Unexpected pseudo");
}
if (aDoAnimations) {
// Normally the animation manager has already added the correct
// style rule. However, if the animation-name just changed, it
// might have been wrong. So ask it to double-check based on the
// resulting style context.
nsIStyleRule *oldAnimRule = GetAnimationRule(aRuleNode);
nsIStyleRule *animRule = PresContext()->AnimationManager()->
CheckAnimationRule(result, aElementForAnimation);
NS_ABORT_IF_FALSE(result->GetRuleNode() == aRuleNode,
"unexpected rule node");
NS_ABORT_IF_FALSE(!result->GetStyleIfVisited() == !aVisitedRuleNode,
"unexpected visited rule node");
NS_ABORT_IF_FALSE(!aVisitedRuleNode ||
result->GetStyleIfVisited()->GetRuleNode() ==
aVisitedRuleNode,
"unexpected visited rule node");
if (oldAnimRule != animRule) {
nsRuleNode *ruleNode =
ReplaceAnimationRule(aRuleNode, oldAnimRule, animRule);
nsRuleNode *visitedRuleNode = aVisitedRuleNode
? ReplaceAnimationRule(aVisitedRuleNode, oldAnimRule, animRule)
: nullptr;
result = GetContext(aParentContext, ruleNode, visitedRuleNode,
aIsLink, aIsVisitedLink,
aPseudoTag, aPseudoType, false, nullptr);
}
}
if (aElementForAnimation && aElementForAnimation->IsHTML(nsGkAtoms::body) &&
aPseudoType == nsCSSPseudoElements::ePseudo_NotPseudoElement &&
PresContext()->CompatibilityMode() == eCompatibility_NavQuirks) {
nsIDocument* doc = aElementForAnimation->GetCurrentDoc();
if (doc && doc->GetBodyElement() == aElementForAnimation) {
// Update the prescontext's body color
PresContext()->SetBodyTextColor(result->GetStyleColor()->mColor);
}
}
return result.forget();
}
void
nsStyleSet::AddImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode,
nsRuleWalker* aRuleWalker)
{
NS_ASSERTION(aCurrLevelNode &&
aCurrLevelNode != aLastPrevLevelNode, "How did we get here?");
nsAutoTArray<nsIStyleRule*, 16> importantRules;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
// We guarantee that we never walk the root node here, so no need
// to null-check GetRule(). Furthermore, it must be a CSS rule.
NS_ASSERTION(nsRefPtr<css::StyleRule>(do_QueryObject(node->GetRule())),
"Unexpected non-CSS rule");
nsIStyleRule* impRule =
static_cast<css::StyleRule*>(node->GetRule())->GetImportantRule();
if (impRule)
importantRules.AppendElement(impRule);
}
NS_ASSERTION(importantRules.Length() != 0,
"Why did we think there were important rules?");
for (uint32_t i = importantRules.Length(); i-- != 0; ) {
aRuleWalker->Forward(importantRules[i]);
}
}
#ifdef DEBUG
void
nsStyleSet::AssertNoImportantRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode)
{
if (!aCurrLevelNode)
return;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
nsRefPtr<css::StyleRule> rule(do_QueryObject(node->GetRule()));
NS_ASSERTION(rule, "Unexpected non-CSS rule");
NS_ASSERTION(!rule->GetImportantRule(), "Unexpected important rule");
}
}
void
nsStyleSet::AssertNoCSSRules(nsRuleNode* aCurrLevelNode,
nsRuleNode* aLastPrevLevelNode)
{
if (!aCurrLevelNode)
return;
for (nsRuleNode *node = aCurrLevelNode; node != aLastPrevLevelNode;
node = node->GetParent()) {
nsIStyleRule *rule = node->GetRule();
nsRefPtr<css::StyleRule> cssRule(do_QueryObject(rule));
NS_ASSERTION(!cssRule || !cssRule->Selector(), "Unexpected CSS rule");
}
}
#endif
// Enumerate the rules in a way that cares about the order of the rules.
void
nsStyleSet::FileRules(nsIStyleRuleProcessor::EnumFunc aCollectorFunc,
RuleProcessorData* aData, nsIContent* aContent,
nsRuleWalker* aRuleWalker)
{
SAMPLE_LABEL("nsStyleSet", "FileRules");
// Cascading order:
// [least important]
// - UA normal rules = Agent normal
// - User normal rules = User normal
// - Presentation hints = PresHint normal
// - Author normal rules = Document normal
// - Override normal rules = Override normal
// - animation rules = Animation normal
// - Author !important rules = Document !important
// - Override !important rules = Override !important
// - User !important rules = User !important
// - UA !important rules = Agent !important
// - transition rules = Transition normal
// [most important]
// Save off the last rule before we start walking our agent sheets;
// this will be either the root or one of the restriction rules.
nsRuleNode* lastRestrictionRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(eAgentSheet, false, true);
if (mRuleProcessors[eAgentSheet])
(*aCollectorFunc)(mRuleProcessors[eAgentSheet], aData);
nsRuleNode* lastAgentRN = aRuleWalker->CurrentNode();
bool haveImportantUARules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(eUserSheet, false, true);
bool skipUserStyles =
aContent && aContent->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[eUserSheet], aData);
nsRuleNode* lastUserRN = aRuleWalker->CurrentNode();
bool haveImportantUserRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(ePresHintSheet, false, false);
if (mRuleProcessors[ePresHintSheet])
(*aCollectorFunc)(mRuleProcessors[ePresHintSheet], aData);
nsRuleNode* lastPresHintRN = aRuleWalker->CurrentNode();
aRuleWalker->SetLevel(eDocSheet, false, true);
bool cutOffInheritance = false;
if (mBindingManager && aContent) {
// We can supply additional document-level sheets that should be walked.
mBindingManager->WalkRules(aCollectorFunc,
static_cast<ElementDependentRuleProcessorData*>(aData),
&cutOffInheritance);
}
if (!skipUserStyles && !cutOffInheritance &&
mRuleProcessors[eDocSheet]) // NOTE: different
(*aCollectorFunc)(mRuleProcessors[eDocSheet], aData);
aRuleWalker->SetLevel(eStyleAttrSheet, false,
aRuleWalker->GetCheckForImportantRules());
if (mRuleProcessors[eStyleAttrSheet])
(*aCollectorFunc)(mRuleProcessors[eStyleAttrSheet], aData);
nsRuleNode* lastDocRN = aRuleWalker->CurrentNode();
bool haveImportantDocRules = !aRuleWalker->GetCheckForImportantRules();
aRuleWalker->SetLevel(eOverrideSheet, false, true);
if (mRuleProcessors[eOverrideSheet])
(*aCollectorFunc)(mRuleProcessors[eOverrideSheet], aData);
nsRuleNode* lastOvrRN = aRuleWalker->CurrentNode();
bool haveImportantOverrideRules = !aRuleWalker->GetCheckForImportantRules();
// This needs to match IsMoreSpecificThanAnimation() above.
aRuleWalker->SetLevel(eAnimationSheet, false, false);
(*aCollectorFunc)(mRuleProcessors[eAnimationSheet], aData);
if (haveImportantDocRules) {
aRuleWalker->SetLevel(eDocSheet, true, false);
AddImportantRules(lastDocRN, lastPresHintRN, aRuleWalker); // doc
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastDocRN, lastPresHintRN);
}
#endif
if (haveImportantOverrideRules) {
aRuleWalker->SetLevel(eOverrideSheet, true, false);
AddImportantRules(lastOvrRN, lastDocRN, aRuleWalker); // override
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastOvrRN, lastDocRN);
}
#endif
#ifdef DEBUG
AssertNoCSSRules(lastPresHintRN, lastUserRN);
#endif
if (haveImportantUserRules) {
aRuleWalker->SetLevel(eUserSheet, true, false);
AddImportantRules(lastUserRN, lastAgentRN, aRuleWalker); //user
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastUserRN, lastAgentRN);
}
#endif
if (haveImportantUARules) {
aRuleWalker->SetLevel(eAgentSheet, true, false);
AddImportantRules(lastAgentRN, lastRestrictionRN, aRuleWalker); //agent
}
#ifdef DEBUG
else {
AssertNoImportantRules(lastAgentRN, lastRestrictionRN);
}
#endif
#ifdef DEBUG
AssertNoCSSRules(lastRestrictionRN, mRuleTree);
#endif
#ifdef DEBUG
nsRuleNode *lastImportantRN = aRuleWalker->CurrentNode();
#endif
aRuleWalker->SetLevel(eTransitionSheet, false, false);
(*aCollectorFunc)(mRuleProcessors[eTransitionSheet], aData);
#ifdef DEBUG
AssertNoCSSRules(aRuleWalker->CurrentNode(), lastImportantRN);
#endif
}
// Enumerate all the rules in a way that doesn't care about the order
// of the rules and doesn't walk !important-rules.
void
nsStyleSet::WalkRuleProcessors(nsIStyleRuleProcessor::EnumFunc aFunc,
ElementDependentRuleProcessorData* aData,
bool aWalkAllXBLStylesheets)
{
if (mRuleProcessors[eAgentSheet])
(*aFunc)(mRuleProcessors[eAgentSheet], aData);
bool skipUserStyles = aData->mElement->IsInNativeAnonymousSubtree();
if (!skipUserStyles && mRuleProcessors[eUserSheet]) // NOTE: different
(*aFunc)(mRuleProcessors[eUserSheet], aData);
if (mRuleProcessors[ePresHintSheet])
(*aFunc)(mRuleProcessors[ePresHintSheet], aData);
bool cutOffInheritance = false;
if (mBindingManager) {
// We can supply additional document-level sheets that should be walked.
if (aWalkAllXBLStylesheets) {
mBindingManager->WalkAllRules(aFunc, aData);
} else {
mBindingManager->WalkRules(aFunc, aData, &cutOffInheritance);
}
}
if (!skipUserStyles && !cutOffInheritance &&
mRuleProcessors[eDocSheet]) // NOTE: different
(*aFunc)(mRuleProcessors[eDocSheet], aData);
if (mRuleProcessors[eStyleAttrSheet])
(*aFunc)(mRuleProcessors[eStyleAttrSheet], aData);
if (mRuleProcessors[eOverrideSheet])
(*aFunc)(mRuleProcessors[eOverrideSheet], aData);
(*aFunc)(mRuleProcessors[eAnimationSheet], aData);
(*aFunc)(mRuleProcessors[eTransitionSheet], aData);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleFor(Element* aElement,
nsStyleContext* aParentContext)
{
TreeMatchContext treeContext(true, nsRuleWalker::eRelevantLinkUnvisited,
aElement->OwnerDoc());
return ResolveStyleFor(aElement, aParentContext, treeContext);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleFor(Element* aElement,
nsStyleContext* aParentContext,
TreeMatchContext& aTreeMatchContext)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
NS_ASSERTION(aElement, "aElement must not be null");
nsRuleWalker ruleWalker(mRuleTree);
aTreeMatchContext.ResetForUnvisitedMatching();
ElementRuleProcessorData data(PresContext(), aElement, &ruleWalker,
aTreeMatchContext);
FileRules(EnumRulesMatching<ElementRuleProcessorData>, &data, aElement,
&ruleWalker);
nsRuleNode *ruleNode = ruleWalker.CurrentNode();
nsRuleNode *visitedRuleNode = nullptr;
if (aTreeMatchContext.HaveRelevantLink()) {
aTreeMatchContext.ResetForVisitedMatching();
ruleWalker.Reset();
FileRules(EnumRulesMatching<ElementRuleProcessorData>, &data, aElement,
&ruleWalker);
visitedRuleNode = ruleWalker.CurrentNode();
}
return GetContext(aParentContext, ruleNode, visitedRuleNode,
nsCSSRuleProcessor::IsLink(aElement),
nsCSSRuleProcessor::GetContentState(aElement, aTreeMatchContext).
HasState(NS_EVENT_STATE_VISITED),
nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement,
true, aElement);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleForRules(nsStyleContext* aParentContext,
const nsTArray< nsCOMPtr<nsIStyleRule> > &aRules)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
nsRuleWalker ruleWalker(mRuleTree);
// FIXME: Perhaps this should be passed in, but it probably doesn't
// matter.
ruleWalker.SetLevel(eDocSheet, false, false);
for (uint32_t i = 0; i < aRules.Length(); i++) {
ruleWalker.ForwardOnPossiblyCSSRule(aRules.ElementAt(i));
}
return GetContext(aParentContext, ruleWalker.CurrentNode(), nullptr,
false, false,
nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement,
false, nullptr);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleForRules(nsStyleContext* aParentContext,
nsStyleContext* aOldStyle,
const nsTArray<RuleAndLevel>& aRules)
{
nsRuleWalker ruleWalker(mRuleTree);
for (int32_t i = aRules.Length() - 1; i >= 0; --i) {
ruleWalker.SetLevel(aRules[i].mLevel, false, false);
ruleWalker.ForwardOnPossiblyCSSRule(aRules[i].mRule);
}
return GetContext(aParentContext, ruleWalker.CurrentNode(), nullptr,
aOldStyle->IsLinkContext(), aOldStyle->RelevantLinkVisited(),
nullptr, nsCSSPseudoElements::ePseudo_NotPseudoElement,
false, nullptr);
}
already_AddRefed<nsStyleContext>
nsStyleSet::ResolveStyleByAddingRules(nsStyleContext* aBaseContext,
const nsCOMArray<nsIStyleRule> &aRules)
{
NS_ENSURE_FALSE(mInShutdown, nullptr);
nsRuleWalker ruleWalker(mRuleTree);
ruleWalker.SetCurrentNode(aBaseContext->GetRuleNode());