forked from mozilla/gecko-dev
-
Notifications
You must be signed in to change notification settings - Fork 2
/
nsINode.h
2051 lines (1846 loc) · 72 KB
/
nsINode.h
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/. */
#ifndef nsINode_h___
#define nsINode_h___
#include "mozilla/Likely.h"
#include "nsCOMPtr.h" // for member, local
#include "nsGkAtoms.h" // for nsGkAtoms::baseURIProperty
#include "nsIDOMNode.h"
#include "mozilla/dom/NodeInfo.h" // member (in nsCOMPtr)
#include "nsIVariant.h" // for use in GetUserData()
#include "nsNodeInfoManager.h" // for use in NodePrincipal()
#include "nsPropertyTable.h" // for typedefs
#include "nsTObserverArray.h" // for member
#include "mozilla/ErrorResult.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/EventTarget.h" // for base class
#include "js/TypeDecls.h" // for Handle, Value, JSObject, JSContext
#include "mozilla/dom/DOMString.h"
#include "mozilla/dom/BindingDeclarations.h"
// Including 'windows.h' will #define GetClassInfo to something else.
#ifdef XP_WIN
#ifdef GetClassInfo
#undef GetClassInfo
#endif
#endif
class nsAttrAndChildArray;
class nsChildContentList;
struct nsCSSSelectorList;
class nsDOMAttributeMap;
class nsIContent;
class nsIDocument;
class nsIDOMElement;
class nsIDOMNodeList;
class nsIEditor;
class nsIFrame;
class nsIMutationObserver;
class nsINodeList;
class nsIPresShell;
class nsIPrincipal;
class nsIURI;
class nsNodeSupportsWeakRefTearoff;
class nsNodeWeakReference;
class nsXPCClassInfo;
class nsDOMMutationObserver;
namespace mozilla {
class EventListenerManager;
namespace dom {
/**
* @return true if aChar is what the DOM spec defines as 'space character'.
* http://dom.spec.whatwg.org/#space-character
*/
inline bool IsSpaceCharacter(char16_t aChar) {
return aChar == ' ' || aChar == '\t' || aChar == '\n' || aChar == '\r' ||
aChar == '\f';
}
inline bool IsSpaceCharacter(char aChar) {
return aChar == ' ' || aChar == '\t' || aChar == '\n' || aChar == '\r' ||
aChar == '\f';
}
struct BoxQuadOptions;
struct ConvertCoordinateOptions;
class DOMPoint;
class DOMQuad;
class DOMRectReadOnly;
class Element;
class EventHandlerNonNull;
class OnErrorEventHandlerNonNull;
template<typename T> class Optional;
class Text;
class TextOrElementOrDocument;
struct DOMPointInit;
} // namespace dom
} // namespace mozilla
#define NODE_FLAG_BIT(n_) \
(nsWrapperCache::FlagsType(1U) << (WRAPPER_CACHE_FLAGS_BITS_USED + (n_)))
enum {
// This bit will be set if the node has a listener manager.
NODE_HAS_LISTENERMANAGER = NODE_FLAG_BIT(0),
// Whether this node has had any properties set on it
NODE_HAS_PROPERTIES = NODE_FLAG_BIT(1),
// Whether this node is the root of an anonymous subtree. Note that this
// need not be a native anonymous subtree. Any anonymous subtree, including
// XBL-generated ones, will do. This flag is set-once: once a node has it,
// it must not be removed.
// NOTE: Should only be used on nsIContent nodes
NODE_IS_ANONYMOUS_ROOT = NODE_FLAG_BIT(2),
// Whether the node has some ancestor, possibly itself, that is native
// anonymous. This includes ancestors crossing XBL scopes, in cases when an
// XBL binding is attached to an element which has a native anonymous
// ancestor. This flag is set-once: once a node has it, it must not be
// removed.
// NOTE: Should only be used on nsIContent nodes
NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE = NODE_FLAG_BIT(3),
// Whether this node is the root of a native anonymous (from the perspective
// of its parent) subtree. This flag is set-once: once a node has it, it
// must not be removed.
// NOTE: Should only be used on nsIContent nodes
NODE_IS_NATIVE_ANONYMOUS_ROOT = NODE_FLAG_BIT(4),
// Forces the XBL code to treat this node as if it were
// in the document and therefore should get bindings attached.
NODE_FORCE_XBL_BINDINGS = NODE_FLAG_BIT(5),
// Whether a binding manager may have a pointer to this
NODE_MAY_BE_IN_BINDING_MNGR = NODE_FLAG_BIT(6),
NODE_IS_EDITABLE = NODE_FLAG_BIT(7),
// For all Element nodes, NODE_MAY_HAVE_CLASS is guaranteed to be set if the
// node in fact has a class, but may be set even if it doesn't.
NODE_MAY_HAVE_CLASS = NODE_FLAG_BIT(8),
// Whether the node participates in a shadow tree.
NODE_IS_IN_SHADOW_TREE = NODE_FLAG_BIT(9),
// Node has an :empty or :-moz-only-whitespace selector
NODE_HAS_EMPTY_SELECTOR = NODE_FLAG_BIT(10),
// A child of the node has a selector such that any insertion,
// removal, or appending of children requires restyling the parent.
NODE_HAS_SLOW_SELECTOR = NODE_FLAG_BIT(11),
// A child of the node has a :first-child, :-moz-first-node,
// :only-child, :last-child or :-moz-last-node selector.
NODE_HAS_EDGE_CHILD_SELECTOR = NODE_FLAG_BIT(12),
// A child of the node has a selector such that any insertion or
// removal of children requires restyling later siblings of that
// element. Additionally (in this manner it is stronger than
// NODE_HAS_SLOW_SELECTOR), if a child's style changes due to any
// other content tree changes (e.g., the child changes to or from
// matching :empty due to a grandchild insertion or removal), the
// child's later siblings must also be restyled.
NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS = NODE_FLAG_BIT(13),
NODE_ALL_SELECTOR_FLAGS = NODE_HAS_EMPTY_SELECTOR |
NODE_HAS_SLOW_SELECTOR |
NODE_HAS_EDGE_CHILD_SELECTOR |
NODE_HAS_SLOW_SELECTOR_LATER_SIBLINGS,
// This node needs to go through frame construction to get a frame (or
// undisplayed entry).
NODE_NEEDS_FRAME = NODE_FLAG_BIT(14),
// At least one descendant in the flattened tree has NODE_NEEDS_FRAME set.
// This should be set on every node on the flattened tree path between the
// node(s) with NODE_NEEDS_FRAME and the root content.
NODE_DESCENDANTS_NEED_FRAMES = NODE_FLAG_BIT(15),
// Set if the node has the accesskey attribute set.
NODE_HAS_ACCESSKEY = NODE_FLAG_BIT(16),
// Set if the node has right-to-left directionality
NODE_HAS_DIRECTION_RTL = NODE_FLAG_BIT(17),
// Set if the node has left-to-right directionality
NODE_HAS_DIRECTION_LTR = NODE_FLAG_BIT(18),
NODE_ALL_DIRECTION_FLAGS = NODE_HAS_DIRECTION_LTR |
NODE_HAS_DIRECTION_RTL,
NODE_CHROME_ONLY_ACCESS = NODE_FLAG_BIT(19),
NODE_IS_ROOT_OF_CHROME_ONLY_ACCESS = NODE_FLAG_BIT(20),
// Remaining bits are node type specific.
NODE_TYPE_SPECIFIC_BITS_OFFSET = 21
};
// Make sure we have space for our bits
#define ASSERT_NODE_FLAGS_SPACE(n) \
static_assert(WRAPPER_CACHE_FLAGS_BITS_USED + (n) <= \
sizeof(nsWrapperCache::FlagsType) * 8, \
"Not enough space for our bits")
ASSERT_NODE_FLAGS_SPACE(NODE_TYPE_SPECIFIC_BITS_OFFSET);
/**
* Class used to detect unexpected mutations. To use the class create an
* nsMutationGuard on the stack before unexpected mutations could occur.
* You can then at any time call Mutated to check if any unexpected mutations
* have occurred.
*/
class nsMutationGuard {
public:
nsMutationGuard()
{
mStartingGeneration = sGeneration;
}
/**
* Returns true if any unexpected mutations have occurred. You can pass in
* an 8-bit ignore count to ignore a number of expected mutations.
*
* We don't need to care about overflow because subtraction of uint64_t's is
* finding the difference between two elements of the group Z < 2^64. Once
* we know the difference between two elements we only need to check that is
* less than the given number of mutations to know less than that many
* mutations occured. Assuming constant 1ns mutations it would take 584
* years for sGeneration to fully wrap around so we can ignore a guard living
* through a full wrap around.
*/
bool Mutated(uint8_t aIgnoreCount)
{
return (sGeneration - mStartingGeneration) > aIgnoreCount;
}
// This function should be called whenever a mutation that we want to keep
// track of happen. For now this is only done when children are added or
// removed, but we might do it for attribute changes too in the future.
static void DidMutate()
{
sGeneration++;
}
private:
// This is the value sGeneration had when the guard was constructed.
uint64_t mStartingGeneration;
// This value is incremented on every mutation, for the life of the process.
static uint64_t sGeneration;
};
// This should be used for any nsINode sub-class that has fields of its own
// that it needs to measure; any sub-class that doesn't use it will inherit
// SizeOfExcludingThis from its super-class. SizeOfIncludingThis() need not be
// defined, it is inherited from nsINode.
// This macro isn't actually specific to nodes, and bug 956400 will move it into MFBT.
#define NS_DECL_SIZEOF_EXCLUDING_THIS \
virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const MOZ_OVERRIDE;
// Categories of node properties
// 0 is global.
#define DOM_USER_DATA 1
#define SMIL_MAPPED_ATTR_ANIMVAL 2
// IID for the nsINode interface
#define NS_INODE_IID \
{ 0x66972940, 0x1d1b, 0x4d15, \
{ 0x93, 0x11, 0x96, 0x72, 0x84, 0x2e, 0xc7, 0x27 } }
/**
* An internal interface that abstracts some DOMNode-related parts that both
* nsIContent and nsIDocument share. An instance of this interface has a list
* of nsIContent children and provides access to them.
*/
class nsINode : public mozilla::dom::EventTarget
{
public:
typedef mozilla::dom::BoxQuadOptions BoxQuadOptions;
typedef mozilla::dom::ConvertCoordinateOptions ConvertCoordinateOptions;
typedef mozilla::dom::DOMPoint DOMPoint;
typedef mozilla::dom::DOMPointInit DOMPointInit;
typedef mozilla::dom::DOMQuad DOMQuad;
typedef mozilla::dom::DOMRectReadOnly DOMRectReadOnly;
typedef mozilla::dom::TextOrElementOrDocument TextOrElementOrDocument;
typedef mozilla::ErrorResult ErrorResult;
NS_DECLARE_STATIC_IID_ACCESSOR(NS_INODE_IID)
// Among the sub-classes that inherit (directly or indirectly) from nsINode,
// measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - nsGenericHTMLElement: mForm, mFieldSet
// - nsGenericHTMLFrameElement: mFrameLoader (bug 672539)
// - HTMLBodyElement: mContentStyleRule
// - HTMLDataListElement: mOptions
// - HTMLFieldSetElement: mElements, mDependentElements, mFirstLegend
// - HTMLFormElement: many!
// - HTMLFrameSetElement: mRowSpecs, mColSpecs
// - HTMLInputElement: mInputData, mFiles, mFileList, mStaticDocfileList
// - nsHTMLMapElement: mAreas
// - HTMLMediaElement: many!
// - nsHTMLOutputElement: mDefaultValue, mTokenList
// - nsHTMLRowElement: mCells
// - nsHTMLSelectElement: mOptions, mRestoreState
// - nsHTMLTableElement: mTBodies, mRows, mTableInheritedAttributes
// - nsHTMLTableSectionElement: mRows
// - nsHTMLTextAreaElement: mControllers, mState
//
// The following members don't need to be measured:
// - nsIContent: mPrimaryFrame, because it's non-owning and measured elsewhere
//
virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
// SizeOfIncludingThis doesn't need to be overridden by sub-classes because
// sub-classes of nsINode are guaranteed to be laid out in memory in such a
// way that |this| points to the start of the allocated object, even in
// methods of nsINode's sub-classes, and so |aMallocSizeOf(this)| is always
// safe to call no matter which object it was invoked on.
virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
friend class nsNodeUtils;
friend class nsNodeWeakReference;
friend class nsNodeSupportsWeakRefTearoff;
friend class nsAttrAndChildArray;
#ifdef MOZILLA_INTERNAL_API
explicit nsINode(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: mNodeInfo(aNodeInfo),
mParent(nullptr),
mBoolFlags(0),
mNextSibling(nullptr),
mPreviousSibling(nullptr),
mFirstChild(nullptr),
mSubtreeRoot(this),
mSlots(nullptr)
{
}
#endif
virtual ~nsINode();
/**
* Bit-flags to pass (or'ed together) to IsNodeOfType()
*/
enum {
/** nsIContent nodes */
eCONTENT = 1 << 0,
/** nsIDocument nodes */
eDOCUMENT = 1 << 1,
/** nsIAttribute nodes */
eATTRIBUTE = 1 << 2,
/** text nodes */
eTEXT = 1 << 3,
/** xml processing instructions */
ePROCESSING_INSTRUCTION = 1 << 4,
/** comment nodes */
eCOMMENT = 1 << 5,
/** form control elements */
eHTML_FORM_CONTROL = 1 << 6,
/** document fragments */
eDOCUMENT_FRAGMENT = 1 << 7,
/** data nodes (comments, PIs, text). Nodes of this type always
returns a non-null value for nsIContent::GetText() */
eDATA_NODE = 1 << 8,
/** HTMLMediaElement */
eMEDIA = 1 << 9,
/** animation elements */
eANIMATION = 1 << 10,
/** filter elements that implement SVGFilterPrimitiveStandardAttributes */
eFILTER = 1 << 11
};
/**
* API for doing a quick check if a content is of a given
* type, such as Text, Document, Comment ... Use this when you can instead of
* checking the tag.
*
* @param aFlags what types you want to test for (see above)
* @return whether the content matches ALL flags passed in
*/
virtual bool IsNodeOfType(uint32_t aFlags) const = 0;
virtual JSObject* WrapObject(JSContext *aCx) MOZ_OVERRIDE;
/**
* returns true if we are in priviliged code or
* layout.css.getBoxQuads.enabled == true.
*/
static bool HasBoxQuadsSupport(JSContext* aCx, JSObject* /* unused */);
protected:
/**
* WrapNode is called from WrapObject to actually wrap this node, WrapObject
* does some additional checks and fix-up that's common to all nodes. WrapNode
* should just call the DOM binding's Wrap function.
*/
virtual JSObject* WrapNode(JSContext *aCx) = 0;
public:
mozilla::dom::ParentObject GetParentObject() const; // Implemented in nsIDocument.h
/**
* Return the scope chain parent for this node, for use in things
* like event handler compilation. Returning null means to use the
* global object as the scope chain parent.
*/
virtual nsINode* GetScopeChainParent() const;
/**
* Return whether the node is an Element node
*/
bool IsElement() const {
return GetBoolFlag(NodeIsElement);
}
/**
* Return this node as an Element. Should only be used for nodes
* for which IsElement() is true. This is defined inline in Element.h.
*/
mozilla::dom::Element* AsElement();
const mozilla::dom::Element* AsElement() const;
/**
* Return this node as nsIContent. Should only be used for nodes for which
* IsContent() is true. This is defined inline in nsIContent.h.
*/
nsIContent* AsContent();
const nsIContent* AsContent() const
{
return const_cast<nsINode*>(this)->AsContent();
}
/**
* Return this node as Text if it is one, otherwise null. This is defined
* inline in Text.h.
*/
mozilla::dom::Text* GetAsText();
const mozilla::dom::Text* GetAsText() const;
virtual nsIDOMNode* AsDOMNode() = 0;
/**
* Return if this node has any children.
*/
bool HasChildren() const { return !!mFirstChild; }
/**
* Get the number of children
* @return the number of children
*/
virtual uint32_t GetChildCount() const = 0;
/**
* Get a child by index
* @param aIndex the index of the child to get
* @return the child, or null if index out of bounds
*/
virtual nsIContent* GetChildAt(uint32_t aIndex) const = 0;
/**
* Get a raw pointer to the child array. This should only be used if you
* plan to walk a bunch of the kids, promise to make sure that nothing ever
* mutates (no attribute changes, not DOM tree changes, no script execution,
* NOTHING), and will never ever peform an out-of-bounds access here. This
* method may return null if there are no children, or it may return a
* garbage pointer. In all cases the out param will be set to the number of
* children.
*/
virtual nsIContent * const * GetChildArray(uint32_t* aChildCount) const = 0;
/**
* Get the index of a child within this content
* @param aPossibleChild the child to get the index of.
* @return the index of the child, or -1 if not a child
*
* If the return value is not -1, then calling GetChildAt() with that value
* will return aPossibleChild.
*/
virtual int32_t IndexOf(const nsINode* aPossibleChild) const = 0;
/**
* Return the "owner document" of this node. Note that this is not the same
* as the DOM ownerDocument -- that's null for Document nodes, whereas for a
* nsIDocument GetOwnerDocument returns the document itself. For nsIContent
* implementations the two are the same.
*/
nsIDocument *OwnerDoc() const
{
return mNodeInfo->GetDocument();
}
/**
* Return the "owner document" of this node as an nsINode*. Implemented
* in nsIDocument.h.
*/
nsINode *OwnerDocAsNode() const;
/**
* Returns true if the content has an ancestor that is a document.
*
* @return whether this content is in a document tree
*/
bool IsInUncomposedDoc() const
{
return GetBoolFlag(IsInDocument);
}
/**
* @deprecated
*/
bool IsInDoc() const
{
return IsInUncomposedDoc();
}
/**
* Get the document that this content is currently in, if any. This will be
* null if the content has no ancestor that is a document.
*
* @return the current document
*/
nsIDocument* GetUncomposedDoc() const
{
return IsInUncomposedDoc() ? OwnerDoc() : nullptr;
}
/**
* @deprecated
*/
nsIDocument *GetCurrentDoc() const
{
return GetUncomposedDoc();
}
/**
* This method gets the current doc of the node hosting this content
* or the current doc of this content if it is not being hosted. This
* method walks through ShadowRoot boundaries until it reach the host
* that is located in the root of the "tree of trees" (see Shadow DOM
* spec) and returns the current doc for that host.
*/
nsIDocument* GetComposedDoc() const
{
return IsInShadowTree() ?
GetComposedDocInternal() : GetUncomposedDoc();
}
/**
* @deprecated
*/
nsIDocument* GetCrossShadowCurrentDoc() const
{
return GetComposedDoc();
}
/**
* Returns true if GetComposedDoc() would return a non-null value.
*/
bool IsInComposedDoc() const
{
return IsInUncomposedDoc() || (IsInShadowTree() && GetComposedDocInternal());
}
/**
* The values returned by this function are the ones defined for
* nsIDOMNode.nodeType
*/
uint16_t NodeType() const
{
return mNodeInfo->NodeType();
}
const nsString& NodeName() const
{
return mNodeInfo->NodeName();
}
const nsString& LocalName() const
{
return mNodeInfo->LocalName();
}
/**
* Get the tag for this element. This will always return a non-null atom
* pointer (as implied by the naming of the method). For elements this is
* the non-namespaced tag, and for other nodes it's something like "#text",
* "#comment", "#document", etc.
*/
nsIAtom* Tag() const
{
return mNodeInfo->NameAtom();
}
/**
* Insert a content node at a particular index. This method handles calling
* BindToTree on the child appropriately.
*
* @param aKid the content to insert
* @param aIndex the index it is being inserted at (the index it will have
* after it is inserted)
* @param aNotify whether to notify the document (current document for
* nsIContent, and |this| for nsIDocument) that the insert has
* occurred
*
* @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
* than one element node as a child of a document. Doing this will also
* assert -- you shouldn't be doing it! Check with
* nsIDocument::GetRootElement() first if you're not sure. Apart from this
* one constraint, this doesn't do any checking on whether aKid is a valid
* child of |this|.
*
* @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
*/
virtual nsresult InsertChildAt(nsIContent* aKid, uint32_t aIndex,
bool aNotify) = 0;
/**
* Append a content node to the end of the child list. This method handles
* calling BindToTree on the child appropriately.
*
* @param aKid the content to append
* @param aNotify whether to notify the document (current document for
* nsIContent, and |this| for nsIDocument) that the append has
* occurred
*
* @throws NS_ERROR_DOM_HIERARCHY_REQUEST_ERR if one attempts to have more
* than one element node as a child of a document. Doing this will also
* assert -- you shouldn't be doing it! Check with
* nsIDocument::GetRootElement() first if you're not sure. Apart from this
* one constraint, this doesn't do any checking on whether aKid is a valid
* child of |this|.
*
* @throws NS_ERROR_OUT_OF_MEMORY in some cases (from BindToTree).
*/
nsresult AppendChildTo(nsIContent* aKid, bool aNotify)
{
return InsertChildAt(aKid, GetChildCount(), aNotify);
}
/**
* Remove a child from this node. This method handles calling UnbindFromTree
* on the child appropriately.
*
* @param aIndex the index of the child to remove
* @param aNotify whether to notify the document (current document for
* nsIContent, and |this| for nsIDocument) that the remove has
* occurred
*
* Note: If there is no child at aIndex, this method will simply do nothing.
*/
virtual void RemoveChildAt(uint32_t aIndex, bool aNotify) = 0;
/**
* Get a property associated with this node.
*
* @param aPropertyName name of property to get.
* @param aStatus out parameter for storing resulting status.
* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
* is not set.
* @return the property. Null if the property is not set
* (though a null return value does not imply the
* property was not set, i.e. it can be set to null).
*/
void* GetProperty(nsIAtom *aPropertyName,
nsresult *aStatus = nullptr) const
{
return GetProperty(0, aPropertyName, aStatus);
}
/**
* Get a property associated with this node.
*
* @param aCategory category of property to get.
* @param aPropertyName name of property to get.
* @param aStatus out parameter for storing resulting status.
* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
* is not set.
* @return the property. Null if the property is not set
* (though a null return value does not imply the
* property was not set, i.e. it can be set to null).
*/
virtual void* GetProperty(uint16_t aCategory,
nsIAtom *aPropertyName,
nsresult *aStatus = nullptr) const;
/**
* Set a property to be associated with this node. This will overwrite an
* existing value if one exists. The existing value is destroyed using the
* destructor function given when that value was set.
*
* @param aPropertyName name of property to set.
* @param aValue new value of property.
* @param aDtor destructor function to be used when this property
* is destroyed.
* @param aTransfer if true the property will not be deleted when the
* ownerDocument of the node changes, if false it
* will be deleted.
*
* @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
* was already set
* @throws NS_ERROR_OUT_OF_MEMORY if that occurs
*/
nsresult SetProperty(nsIAtom *aPropertyName,
void *aValue,
NSPropertyDtorFunc aDtor = nullptr,
bool aTransfer = false)
{
return SetProperty(0, aPropertyName, aValue, aDtor, aTransfer);
}
/**
* Set a property to be associated with this node. This will overwrite an
* existing value if one exists. The existing value is destroyed using the
* destructor function given when that value was set.
*
* @param aCategory category of property to set.
* @param aPropertyName name of property to set.
* @param aValue new value of property.
* @param aDtor destructor function to be used when this property
* is destroyed.
* @param aTransfer if true the property will not be deleted when the
* ownerDocument of the node changes, if false it
* will be deleted.
* @param aOldValue [out] previous value of property.
*
* @return NS_PROPTABLE_PROP_OVERWRITTEN (success value) if the property
* was already set
* @throws NS_ERROR_OUT_OF_MEMORY if that occurs
*/
virtual nsresult SetProperty(uint16_t aCategory,
nsIAtom *aPropertyName,
void *aValue,
NSPropertyDtorFunc aDtor = nullptr,
bool aTransfer = false,
void **aOldValue = nullptr);
/**
* A generic destructor for property values allocated with new.
*/
template<class T>
static void DeleteProperty(void *, nsIAtom *, void *aPropertyValue, void *)
{
delete static_cast<T *>(aPropertyValue);
}
/**
* Destroys a property associated with this node. The value is destroyed
* using the destruction function given when that value was set.
*
* @param aPropertyName name of property to destroy.
*/
void DeleteProperty(nsIAtom *aPropertyName)
{
DeleteProperty(0, aPropertyName);
}
/**
* Destroys a property associated with this node. The value is destroyed
* using the destruction function given when that value was set.
*
* @param aCategory category of property to destroy.
* @param aPropertyName name of property to destroy.
*/
virtual void DeleteProperty(uint16_t aCategory, nsIAtom *aPropertyName);
/**
* Unset a property associated with this node. The value will not be
* destroyed but rather returned. It is the caller's responsibility to
* destroy the value after that point.
*
* @param aPropertyName name of property to unset.
* @param aStatus out parameter for storing resulting status.
* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
* is not set.
* @return the property. Null if the property is not set
* (though a null return value does not imply the
* property was not set, i.e. it can be set to null).
*/
void* UnsetProperty(nsIAtom *aPropertyName,
nsresult *aStatus = nullptr)
{
return UnsetProperty(0, aPropertyName, aStatus);
}
/**
* Unset a property associated with this node. The value will not be
* destroyed but rather returned. It is the caller's responsibility to
* destroy the value after that point.
*
* @param aCategory category of property to unset.
* @param aPropertyName name of property to unset.
* @param aStatus out parameter for storing resulting status.
* Set to NS_PROPTABLE_PROP_NOT_THERE if the property
* is not set.
* @return the property. Null if the property is not set
* (though a null return value does not imply the
* property was not set, i.e. it can be set to null).
*/
virtual void* UnsetProperty(uint16_t aCategory,
nsIAtom *aPropertyName,
nsresult *aStatus = nullptr);
bool HasProperties() const
{
return HasFlag(NODE_HAS_PROPERTIES);
}
/**
* Return the principal of this node. This is guaranteed to never be a null
* pointer.
*/
nsIPrincipal* NodePrincipal() const {
return mNodeInfo->NodeInfoManager()->DocumentPrincipal();
}
/**
* Get the parent nsIContent for this node.
* @return the parent, or null if no parent or the parent is not an nsIContent
*/
nsIContent* GetParent() const {
return MOZ_LIKELY(GetBoolFlag(ParentIsContent)) ?
reinterpret_cast<nsIContent*>(mParent) : nullptr;
}
/**
* Get the parent nsINode for this node. This can be either an nsIContent,
* an nsIDocument or an nsIAttribute.
* @return the parent node
*/
nsINode* GetParentNode() const
{
return mParent;
}
/**
* Get the parent nsINode for this node if it is an Element.
* @return the parent node
*/
mozilla::dom::Element* GetParentElement() const
{
return mParent && mParent->IsElement() ? mParent->AsElement() : nullptr;
}
/**
* Get the parent Element of this node, traversing over a ShadowRoot
* to its host if necessary.
*/
mozilla::dom::Element* GetParentElementCrossingShadowRoot() const;
/**
* Get the root of the subtree this node belongs to. This never returns
* null. It may return 'this' (e.g. for document nodes, and nodes that
* are the roots of disconnected subtrees).
*/
nsINode* SubtreeRoot() const;
/**
* See nsIDOMEventTarget
*/
NS_DECL_NSIDOMEVENTTARGET
virtual mozilla::EventListenerManager*
GetExistingListenerManager() const MOZ_OVERRIDE;
virtual mozilla::EventListenerManager*
GetOrCreateListenerManager() MOZ_OVERRIDE;
using mozilla::dom::EventTarget::RemoveEventListener;
using nsIDOMEventTarget::AddEventListener;
virtual void AddEventListener(const nsAString& aType,
mozilla::dom::EventListener* aListener,
bool aUseCapture,
const mozilla::dom::Nullable<bool>& aWantsUntrusted,
mozilla::ErrorResult& aRv) MOZ_OVERRIDE;
using nsIDOMEventTarget::AddSystemEventListener;
virtual nsIDOMWindow* GetOwnerGlobal() MOZ_OVERRIDE;
/**
* Adds a mutation observer to be notified when this node, or any of its
* descendants, are modified. The node will hold a weak reference to the
* observer, which means that it is the responsibility of the observer to
* remove itself in case it dies before the node. If an observer is added
* while observers are being notified, it may also be notified. In general,
* adding observers while inside a notification is not a good idea. An
* observer that is already observing the node must not be added without
* being removed first.
*/
void AddMutationObserver(nsIMutationObserver* aMutationObserver)
{
nsSlots* s = Slots();
NS_ASSERTION(s->mMutationObservers.IndexOf(aMutationObserver) ==
nsTArray<int>::NoIndex,
"Observer already in the list");
s->mMutationObservers.AppendElement(aMutationObserver);
}
/**
* Same as above, but only adds the observer if its not observing
* the node already.
*/
void AddMutationObserverUnlessExists(nsIMutationObserver* aMutationObserver)
{
nsSlots* s = Slots();
s->mMutationObservers.AppendElementUnlessExists(aMutationObserver);
}
/**
* Removes a mutation observer.
*/
void RemoveMutationObserver(nsIMutationObserver* aMutationObserver)
{
nsSlots* s = GetExistingSlots();
if (s) {
s->mMutationObservers.RemoveElement(aMutationObserver);
}
}
/**
* Clones this node. This needs to be overriden by all node classes. aNodeInfo
* should be identical to this node's nodeInfo, except for the document which
* may be different. When cloning an element, all attributes of the element
* will be cloned. The children of the node will not be cloned.
*
* @param aNodeInfo the nodeinfo to use for the clone
* @param aResult the clone
*/
virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const = 0;
// This class can be extended by subclasses that wish to store more
// information in the slots.
class nsSlots
{
public:
nsSlots()
: mChildNodes(nullptr),
mWeakReference(nullptr)
{
}
// If needed we could remove the vtable pointer this dtor causes by
// putting a DestroySlots function on nsINode
virtual ~nsSlots();
void Traverse(nsCycleCollectionTraversalCallback &cb);
void Unlink();
/**
* A list of mutation observers
*/
nsTObserverArray<nsIMutationObserver*> mMutationObservers;
/**
* An object implementing nsIDOMNodeList for this content (childNodes)
* @see nsIDOMNodeList
* @see nsGenericHTMLElement::GetChildNodes
*
* MSVC 7 doesn't like this as an nsRefPtr
*/
nsChildContentList* mChildNodes;
/**
* Weak reference to this node
*/
nsNodeWeakReference* mWeakReference;
};
/**
* Functions for managing flags and slots
*/
#ifdef DEBUG
nsSlots* DebugGetSlots()
{
return Slots();
}
#endif
void SetFlags(FlagsType aFlagsToSet)
{
NS_ASSERTION(!(aFlagsToSet & (NODE_IS_ANONYMOUS_ROOT |
NODE_IS_NATIVE_ANONYMOUS_ROOT |
NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |
NODE_DESCENDANTS_NEED_FRAMES |
NODE_NEEDS_FRAME |
NODE_CHROME_ONLY_ACCESS)) ||
IsNodeOfType(eCONTENT),
"Flag only permitted on nsIContent nodes");
nsWrapperCache::SetFlags(aFlagsToSet);
}
void UnsetFlags(FlagsType aFlagsToUnset)
{
NS_ASSERTION(!(aFlagsToUnset &
(NODE_IS_ANONYMOUS_ROOT |
NODE_IS_IN_NATIVE_ANONYMOUS_SUBTREE |
NODE_IS_NATIVE_ANONYMOUS_ROOT)),
"Trying to unset write-only flags");
nsWrapperCache::UnsetFlags(aFlagsToUnset);
}
void SetEditableFlag(bool aEditable)
{
if (aEditable) {
SetFlags(NODE_IS_EDITABLE);
}
else {
UnsetFlags(NODE_IS_EDITABLE);
}
}
bool IsEditable() const
{
#ifdef MOZILLA_INTERNAL_API
return IsEditableInternal();
#else
return IsEditableExternal();
#endif