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gecko-dev
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gecko-dev/dom/base/nsRange.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
/*
* Implementation of the DOM Range object.
*/
#ifndef nsRange_h___
#define nsRange_h___
#include "nsCOMPtr.h"
#include "mozilla/dom/AbstractRange.h"
#include "nsLayoutUtils.h"
#include "prmon.h"
#include "nsStubMutationObserver.h"
#include "nsWrapperCache.h"
#include "mozilla/Attributes.h"
#include "mozilla/ErrorResult.h"
#include "mozilla/LinkedList.h"
#include "mozilla/RangeBoundary.h"
namespace mozilla {
namespace dom {
struct ClientRectsAndTexts;
class DocGroup;
class DocumentFragment;
class DOMRect;
class DOMRectList;
class InspectorFontFace;
class Selection;
} // namespace dom
} // namespace mozilla
class nsRange final : public mozilla::dom::AbstractRange,
public nsStubMutationObserver,
// For linking together selection-associated ranges.
public mozilla::LinkedListElement<nsRange> {
typedef mozilla::ErrorResult ErrorResult;
typedef mozilla::dom::AbstractRange AbstractRange;
typedef mozilla::dom::DocGroup DocGroup;
typedef mozilla::dom::DOMRect DOMRect;
typedef mozilla::dom::DOMRectList DOMRectList;
typedef mozilla::RangeBoundary RangeBoundary;
typedef mozilla::RawRangeBoundary RawRangeBoundary;
virtual ~nsRange();
explicit nsRange(nsINode* aNode);
public:
/**
* The following Create() returns `nsRange` instance which is initialized
* only with aNode. The result is never positioned.
*/
static already_AddRefed<nsRange> Create(nsINode* aNode);
/**
* The following Create() may return `nsRange` instance which is initialized
* with given range or points. If it fails initializing new range with the
* arguments, returns `nullptr`. `ErrorResult` is set to an error only
* when this returns `nullptr`. The error code indicates the reason why
* it couldn't initialize the instance.
*/
static already_AddRefed<nsRange> Create(const AbstractRange* aAbstractRange,
ErrorResult& aRv) {
return nsRange::Create(aAbstractRange->StartRef(), aAbstractRange->EndRef(),
aRv);
}
static already_AddRefed<nsRange> Create(nsINode* aStartContainer,
uint32_t aStartOffset,
nsINode* aEndContainer,
uint32_t aEndOffset,
ErrorResult& aRv) {
return nsRange::Create(RawRangeBoundary(aStartContainer, aStartOffset),
RawRangeBoundary(aEndContainer, aEndOffset), aRv);
}
template <typename SPT, typename SRT, typename EPT, typename ERT>
static already_AddRefed<nsRange> Create(
const mozilla::RangeBoundaryBase<SPT, SRT>& aStartBoundary,
const mozilla::RangeBoundaryBase<EPT, ERT>& aEndBoundary,
ErrorResult& aRv);
NS_DECL_ISUPPORTS_INHERITED
NS_IMETHODIMP_(void) DeleteCycleCollectable(void) override;
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(nsRange, AbstractRange)
nsrefcnt GetRefCount() const { return mRefCnt; }
nsINode* GetRoot() const { return mRoot; }
/**
* Return true iff this range is part of a Selection object
* and isn't detached.
*/
bool IsInSelection() const { return !!mSelection; }
MOZ_CAN_RUN_SCRIPT void RegisterSelection(
mozilla::dom::Selection& aSelection);
void UnregisterSelection();
/**
* Returns pointer to a Selection if the range is associated with a Selection.
*/
mozilla::dom::Selection* GetSelection() const;
/**
* Return true if this range was generated.
* @see SetIsGenerated
*/
bool IsGenerated() const { return mIsGenerated; }
/**
* Mark this range as being generated or not.
* Currently it is used for marking ranges that are created when splitting up
* a range to exclude a -moz-user-select:none region.
* @see Selection::AddRangesForSelectableNodes
* @see ExcludeNonSelectableNodes
*/
void SetIsGenerated(bool aIsGenerated) { mIsGenerated = aIsGenerated; }
void Reset();
/**
* SetStart() and SetEnd() sets start point or end point separately.
* However, this is expensive especially when it's a range of Selection.
* When you set both start and end of a range, you should use
* SetStartAndEnd() instead.
*/
nsresult SetStart(nsINode* aContainer, uint32_t aOffset) {
ErrorResult error;
SetStart(RawRangeBoundary(aContainer, aOffset), error);
return error.StealNSResult();
}
nsresult SetEnd(nsINode* aContainer, uint32_t aOffset) {
ErrorResult error;
SetEnd(RawRangeBoundary(aContainer, aOffset), error);
return error.StealNSResult();
}
already_AddRefed<nsRange> CloneRange() const;
/**
* SetStartAndEnd() works similar to call both SetStart() and SetEnd().
* Different from calls them separately, this does nothing if either
* the start point or the end point is invalid point.
* If the specified start point is after the end point, the range will be
* collapsed at the end point. Similarly, if they are in different root,
* the range will be collapsed at the end point.
*/
nsresult SetStartAndEnd(nsINode* aStartContainer, uint32_t aStartOffset,
nsINode* aEndContainer, uint32_t aEndOffset) {
return SetStartAndEnd(RawRangeBoundary(aStartContainer, aStartOffset),
RawRangeBoundary(aEndContainer, aEndOffset));
}
template <typename SPT, typename SRT, typename EPT, typename ERT>
nsresult SetStartAndEnd(
const mozilla::RangeBoundaryBase<SPT, SRT>& aStartBoundary,
const mozilla::RangeBoundaryBase<EPT, ERT>& aEndBoundary) {
return AbstractRange::SetStartAndEndInternal(aStartBoundary, aEndBoundary,
this);
}
/**
* Adds all nodes between |aStartContent| and |aEndContent| to the range.
* The start offset will be set before |aStartContent|,
* while the end offset will be set immediately after |aEndContent|.
*
* Caller must guarantee both nodes are non null and
* children of |aContainer| and that |aEndContent| is after |aStartContent|.
*/
void SelectNodesInContainer(nsINode* aContainer, nsIContent* aStartContent,
nsIContent* aEndContent);
/**
* CollapseTo() works similar to call both SetStart() and SetEnd() with
* same node and offset. This just calls SetStartAndParent() to set
* collapsed range at aContainer and aOffset.
*/
nsresult CollapseTo(nsINode* aContainer, uint32_t aOffset) {
return CollapseTo(RawRangeBoundary(aContainer, aOffset));
}
nsresult CollapseTo(const RawRangeBoundary& aPoint) {
return SetStartAndEnd(aPoint, aPoint);
}
// aMaxRanges is the maximum number of text ranges to record for each face
// (pass 0 to just get the list of faces, without recording exact ranges
// where each face was used).
nsresult GetUsedFontFaces(
nsTArray<mozilla::UniquePtr<mozilla::dom::InspectorFontFace>>& aResult,
uint32_t aMaxRanges, bool aSkipCollapsedWhitespace);
// nsIMutationObserver methods
NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED
NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
// WebIDL
static already_AddRefed<nsRange> Constructor(
const mozilla::dom::GlobalObject& global, mozilla::ErrorResult& aRv);
already_AddRefed<mozilla::dom::DocumentFragment> CreateContextualFragment(
const nsAString& aString, ErrorResult& aError) const;
already_AddRefed<mozilla::dom::DocumentFragment> CloneContents(
ErrorResult& aErr);
int16_t CompareBoundaryPoints(uint16_t aHow, const nsRange& aOtherRange,
ErrorResult& aRv);
int16_t ComparePoint(const nsINode& aContainer, uint32_t aOffset,
ErrorResult& aRv) const;
void DeleteContents(ErrorResult& aRv);
already_AddRefed<mozilla::dom::DocumentFragment> ExtractContents(
ErrorResult& aErr);
nsINode* GetCommonAncestorContainer(ErrorResult& aRv) const {
if (!mIsPositioned) {
aRv.Throw(NS_ERROR_NOT_INITIALIZED);
return nullptr;
}
return GetClosestCommonInclusiveAncestor();
}
void InsertNode(nsINode& aNode, ErrorResult& aErr);
bool IntersectsNode(nsINode& aNode, ErrorResult& aRv);
bool IsPointInRange(const nsINode& aContainer, uint32_t aOffset,
ErrorResult& aRv) const;
void ToString(nsAString& aReturn, ErrorResult& aErr);
void Detach();
// *JS() methods are mapped to Range.*() of DOM.
// They may move focus only when the range represents normal selection.
// These methods shouldn't be used from internal.
void CollapseJS(bool aToStart);
void SelectNodeJS(nsINode& aNode, ErrorResult& aErr);
void SelectNodeContentsJS(nsINode& aNode, ErrorResult& aErr);
void SetEndJS(nsINode& aNode, uint32_t aOffset, ErrorResult& aErr);
void SetEndAfterJS(nsINode& aNode, ErrorResult& aErr);
void SetEndBeforeJS(nsINode& aNode, ErrorResult& aErr);
void SetStartJS(nsINode& aNode, uint32_t aOffset, ErrorResult& aErr);
void SetStartAfterJS(nsINode& aNode, ErrorResult& aErr);
void SetStartBeforeJS(nsINode& aNode, ErrorResult& aErr);
void SurroundContents(nsINode& aNode, ErrorResult& aErr);
already_AddRefed<DOMRect> GetBoundingClientRect(bool aClampToEdge = true,
bool aFlushLayout = true);
already_AddRefed<DOMRectList> GetClientRects(bool aClampToEdge = true,
bool aFlushLayout = true);
void GetClientRectsAndTexts(mozilla::dom::ClientRectsAndTexts& aResult,
ErrorResult& aErr);
// Following methods should be used for internal use instead of *JS().
void SelectNode(nsINode& aNode, ErrorResult& aErr);
void SelectNodeContents(nsINode& aNode, ErrorResult& aErr);
void SetEnd(nsINode& aNode, uint32_t aOffset, ErrorResult& aErr);
void SetEnd(const RawRangeBoundary& aPoint, ErrorResult& aErr);
void SetEndAfter(nsINode& aNode, ErrorResult& aErr);
void SetEndBefore(nsINode& aNode, ErrorResult& aErr);
void SetStart(nsINode& aNode, uint32_t aOffset, ErrorResult& aErr);
void SetStart(const RawRangeBoundary& aPoint, ErrorResult& aErr);
void SetStartAfter(nsINode& aNode, ErrorResult& aErr);
void SetStartBefore(nsINode& aNode, ErrorResult& aErr);
void Collapse(bool aToStart);
static void GetInnerTextNoFlush(mozilla::dom::DOMString& aValue,
mozilla::ErrorResult& aError,
nsIContent* aContainer);
virtual JSObject* WrapObject(JSContext* cx,
JS::Handle<JSObject*> aGivenProto) final;
DocGroup* GetDocGroup() const;
private:
// no copy's or assigns
nsRange(const nsRange&);
nsRange& operator=(const nsRange&);
/**
* Cut or delete the range's contents.
*
* @param aFragment DocumentFragment containing the nodes.
* May be null to indicate the caller doesn't want a
* fragment.
*/
nsresult CutContents(mozilla::dom::DocumentFragment** frag);
static nsresult CloneParentsBetween(nsINode* aAncestor, nsINode* aNode,
nsINode** aClosestAncestor,
nsINode** aFarthestAncestor);
/**
* Returns whether a node is safe to be accessed by the current caller.
*/
bool CanAccess(const nsINode&) const;
void AdjustNextRefsOnCharacterDataSplit(const nsIContent& aContent,
const CharacterDataChangeInfo& aInfo);
struct RangeBoundariesAndRoot {
RawRangeBoundary mStart;
RawRangeBoundary mEnd;
nsINode* mRoot = nullptr;
};
/**
* @param aContent Must be non-nullptr.
*/
RangeBoundariesAndRoot DetermineNewRangeBoundariesAndRootOnCharacterDataMerge(
nsIContent* aContent, const CharacterDataChangeInfo& aInfo) const;
// @return true iff the range is positioned, aContainer belongs to the same
// document as the range, aContainer is a DOCUMENT_TYPE_NODE and
// aOffset doesn't exceed aContainer's length.
bool IsPointComparableToRange(const nsINode& aContainer, uint32_t aOffset,
ErrorResult& aErrorResult) const;
public:
/**
* This helper function gets rects and correlated text for the given range.
* @param aTextList optional where nullptr = don't retrieve text
*/
static void CollectClientRectsAndText(
nsLayoutUtils::RectCallback* aCollector,
mozilla::dom::Sequence<nsString>* aTextList, nsRange* aRange,
nsINode* aStartContainer, uint32_t aStartOffset, nsINode* aEndContainer,
uint32_t aEndOffset, bool aClampToEdge, bool aFlushLayout);
/**
* Scan this range for -moz-user-select:none nodes and split it up into
* multiple ranges to exclude those nodes. The resulting ranges are put
* in aOutRanges. If no -moz-user-select:none node is found in the range
* then |this| is unmodified and is the only range in aOutRanges.
* Otherwise, |this| will be modified so that it ends before the first
* -moz-user-select:none node and additional ranges may also be created.
* If all nodes in the range are -moz-user-select:none then aOutRanges
* will be empty.
* @param aOutRanges the resulting set of ranges
*/
void ExcludeNonSelectableNodes(nsTArray<RefPtr<nsRange>>* aOutRanges);
/**
* Notify the selection listeners after a range has been modified.
*/
MOZ_CAN_RUN_SCRIPT void NotifySelectionListenersAfterRangeSet();
typedef nsTHashtable<nsPtrHashKey<nsRange>> RangeHashTable;
protected:
/**
* https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor
*/
void RegisterClosestCommonInclusiveAncestor(nsINode* aNode);
/**
* https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor
*/
void UnregisterClosestCommonInclusiveAncestor(nsINode* aNode,
bool aIsUnlinking);
/**
* DoSetRange() is called when `AbstractRange::SetStartAndEndInternal()` sets
* mStart and mEnd, or some other internal methods modify `mStart` and/or
* `mEnd`. Therefore, this shouldn't be a virtual method.
*
* @param aStartBoundary Computed start point. This must equals or be
* before aEndBoundary in the DOM tree order.
* @param aEndBoundary Computed end point.
* @param aRootNode The root node.
* @param aNotInsertedYet true if this is called by CharacterDataChanged()
* to disable assertion and suppress re-registering
* a range common ancestor node since the new text
* node of a splitText hasn't been inserted yet.
* CharacterDataChanged() does the re-registering
* when needed. Otherwise, false.
*/
template <typename SPT, typename SRT, typename EPT, typename ERT>
MOZ_CAN_RUN_SCRIPT_BOUNDARY void DoSetRange(
const mozilla::RangeBoundaryBase<SPT, SRT>& aStartBoundary,
const mozilla::RangeBoundaryBase<EPT, ERT>& aEndBoundary,
nsINode* aRootNode, bool aNotInsertedYet = false);
/**
* For a range for which IsInSelection() is true, return the closest common
* inclusive ancestor
* (https://dom.spec.whatwg.org/#concept-tree-inclusive-ancestor)
* for the range, which we had to compute when the common ancestor changed or
* IsInSelection became true, so we could register with it. That is, it's a
* faster version of GetClosestCommonInclusiveAncestor that only works for
* ranges in a Selection. The method will assert and the behavior is undefined
* if called on a range where IsInSelection() is false.
*/
nsINode* GetRegisteredClosestCommonInclusiveAncestor();
// Assume that this is guaranteed that this is held by the caller when
// this is used. (Note that we cannot use AutoRestore for mCalledByJS
// due to a bit field.)
class MOZ_RAII AutoCalledByJSRestore final {
private:
nsRange& mRange;
bool mOldValue;
public:
explicit AutoCalledByJSRestore(nsRange& aRange)
: mRange(aRange), mOldValue(aRange.mCalledByJS) {}
~AutoCalledByJSRestore() { mRange.mCalledByJS = mOldValue; }
bool SavedValue() const { return mOldValue; }
};
struct MOZ_STACK_CLASS AutoInvalidateSelection {
explicit AutoInvalidateSelection(nsRange* aRange) : mRange(aRange) {
if (!mRange->IsInSelection() || sIsNested) {
return;
}
sIsNested = true;
mCommonAncestor = mRange->GetRegisteredClosestCommonInclusiveAncestor();
}
~AutoInvalidateSelection();
nsRange* mRange;
RefPtr<nsINode> mCommonAncestor;
static bool sIsNested;
};
bool MaybeInterruptLastRelease();
#ifdef DEBUG
bool IsCleared() const {
return !mRoot && !mRegisteredClosestCommonInclusiveAncestor &&
!mSelection && !mNextStartRef && !mNextEndRef;
}
#endif // #ifdef DEBUG
nsCOMPtr<nsINode> mRoot;
// mRegisteredClosestCommonInclusiveAncestor is only non-null when the range
// IsInSelection(). It's kept alive via mStart/mEnd,
// because we update it any time those could become disconnected from it.
nsINode* MOZ_NON_OWNING_REF mRegisteredClosestCommonInclusiveAncestor;
mozilla::WeakPtr<mozilla::dom::Selection> mSelection;
// These raw pointers are used to remember a child that is about
// to be inserted between a CharacterData call and a subsequent
// ContentInserted or ContentAppended call. It is safe to store
// these refs because the caller is guaranteed to trigger both
// notifications while holding a strong reference to the new child.
nsIContent* MOZ_NON_OWNING_REF mNextStartRef;
nsIContent* MOZ_NON_OWNING_REF mNextEndRef;
static nsTArray<RefPtr<nsRange>>* sCachedRanges;
friend class mozilla::dom::AbstractRange;
};
#endif /* nsRange_h___ */
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