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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 "nsINode.h"
#include "mozilla/dom/Document.h"
#include "nsLayoutUtils.h"
#include "prmon.h"
#include "nsStubMutationObserver.h"
#include "nsWrapperCache.h"
#include "mozilla/Attributes.h"
#include "mozilla/GuardObjects.h"
#include "mozilla/LinkedList.h"
#include "mozilla/RangeBoundary.h"
namespace mozilla {
class ErrorResult;
namespace dom {
struct ClientRectsAndTexts;
class DocGroup;
class DocumentFragment;
class DOMRect;
class DOMRectList;
class InspectorFontFace;
class Selection;
} // namespace dom
} // namespace mozilla
class nsRange final : public nsStubMutationObserver,
public nsWrapperCache,
// For linking together selection-associated ranges.
public mozilla::LinkedListElement<nsRange> {
typedef mozilla::ErrorResult ErrorResult;
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();
public:
explicit nsRange(nsINode* aNode);
static nsresult CreateRange(nsINode* aStartContainer, uint32_t aStartOffset,
nsINode* aEndContainer, uint32_t aEndOffset,
nsRange** aRange);
static nsresult CreateRange(const RawRangeBoundary& aStart,
const RawRangeBoundary& aEnd, nsRange** aRange);
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsRange)
nsrefcnt GetRefCount() const { return mRefCnt; }
nsINode* GetRoot() const { return mRoot; }
const RangeBoundary& StartRef() const { return mStart; }
nsINode* GetStartContainer() const { return mStart.Container(); }
const RangeBoundary& EndRef() const { return mEnd; }
nsINode* GetEndContainer() const { return mEnd.Container(); }
uint32_t StartOffset() const {
return static_cast<uint32_t>(mStart.Offset());
}
uint32_t EndOffset() const { return static_cast<uint32_t>(mEnd.Offset()); }
nsIContent* GetChildAtStartOffset() const {
return mStart.GetChildAtOffset();
}
nsIContent* GetChildAtEndOffset() const { return mEnd.GetChildAtOffset(); }
bool IsPositioned() const { return mIsPositioned; }
/**
* Return true iff this range is part of a Selection object
* and isn't detached.
*/
bool IsInSelection() const { return !!mSelection; }
/**
* Called when the range is added/removed from a Selection.
*/
void SetSelection(mozilla::dom::Selection* aSelection);
/**
* Returns pointer to a Selection if the range is associated with a Selection.
*/
mozilla::dom::Selection* GetSelection() const { return mSelection; }
/**
* 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::AddItem
* @see ExcludeNonSelectableNodes
*/
void SetIsGenerated(bool aIsGenerated) { mIsGenerated = aIsGenerated; }
nsINode* GetCommonAncestor() const;
void Reset();
/**
* ResetTemporarily() is called when Selection starts to cache the instance
* to reuse later. This method clears mStart, mEnd and mIsPositioned but
* does not clear mRoot for reducing the cost to register this as a mutation
* observer again.
*/
void ResetTemporarily() {
DoSetRange(RawRangeBoundary(), RawRangeBoundary(), mRoot);
}
/**
* 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));
}
nsresult SetStartAndEnd(const RawRangeBoundary& aStart,
const RawRangeBoundary& aEnd);
/**
* 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);
}
/**
* Retrieves node and offset for setting start or end of a range to
* before or after aNode.
*/
static nsINode* GetContainerAndOffsetAfter(nsINode* aNode,
uint32_t* aOffset) {
MOZ_ASSERT(aNode);
MOZ_ASSERT(aOffset);
*aOffset = 0;
nsINode* parentNode = aNode->GetParentNode();
if (!parentNode) {
return nullptr;
}
int32_t indexInParent = parentNode->ComputeIndexOf(aNode);
if (NS_WARN_IF(indexInParent < 0)) {
return nullptr;
}
*aOffset = static_cast<uint32_t>(indexInParent) + 1;
return parentNode;
}
static nsINode* GetContainerAndOffsetBefore(nsINode* aNode,
uint32_t* aOffset) {
MOZ_ASSERT(aNode);
MOZ_ASSERT(aOffset);
*aOffset = 0;
nsINode* parentNode = aNode->GetParentNode();
if (!parentNode) {
return nullptr;
}
int32_t indexInParent = parentNode->ComputeIndexOf(aNode);
if (NS_WARN_IF(indexInParent < 0)) {
return nullptr;
}
*aOffset = static_cast<uint32_t>(indexInParent);
return parentNode;
}
// 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<nsAutoPtr<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);
bool Collapsed() const {
return mIsPositioned && mStart.Container() == mEnd.Container() &&
mStart.Offset() == mEnd.Offset();
}
already_AddRefed<mozilla::dom::DocumentFragment> CreateContextualFragment(
const nsAString& aString, ErrorResult& aError);
already_AddRefed<mozilla::dom::DocumentFragment> CloneContents(
ErrorResult& aErr);
int16_t CompareBoundaryPoints(uint16_t aHow, nsRange& aOther,
ErrorResult& aErr);
int16_t ComparePoint(nsINode& aContainer, uint32_t aOffset,
ErrorResult& aErr) {
return ComparePoint(RawRangeBoundary(&aContainer, aOffset), aErr);
}
int16_t ComparePoint(const RawRangeBoundary& aPoint, ErrorResult& aErr);
void DeleteContents(ErrorResult& aRv);
already_AddRefed<mozilla::dom::DocumentFragment> ExtractContents(
ErrorResult& aErr);
nsINode* GetCommonAncestorContainer(ErrorResult& aRv) const;
nsINode* GetStartContainer(ErrorResult& aRv) const;
uint32_t GetStartOffset(ErrorResult& aRv) const;
nsINode* GetEndContainer(ErrorResult& aRv) const;
uint32_t GetEndOffset(ErrorResult& aRv) const;
void InsertNode(nsINode& aNode, ErrorResult& aErr);
bool IntersectsNode(nsINode& aNode, ErrorResult& aRv);
bool IsPointInRange(nsINode& aContainer, uint32_t aOffset,
ErrorResult& aErr) {
return IsPointInRange(RawRangeBoundary(&aContainer, aOffset), aErr);
}
bool IsPointInRange(const RawRangeBoundary& aPoint, ErrorResult& aErr);
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);
nsINode* GetParentObject() const { return mOwner; }
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;
public:
/**
* Compute the root node of aNode for initializing range classes.
* When aNode is in an anonymous subtree, this returns the shadow root or
* binding parent. Otherwise, the root node of the document or document
* fragment. If this returns nullptr, that means aNode can be neither the
* start container nor end container of any range.
*/
static nsINode* ComputeRootNode(nsINode* aNode);
/**
* Return true if aStartContainer/aStartOffset and aEndContainer/aEndOffset
* are valid start and end points for a range. Otherwise, return false.
*/
static bool IsValidPoints(nsINode* aStartContainer, uint32_t aStartOffset,
nsINode* aEndContainer, uint32_t aEndOffset);
/******************************************************************************
* Utility routine to detect if a content node starts before a range and/or
* ends after a range. If neither it is contained inside the range.
*
* XXX - callers responsibility to ensure node in same doc as range!
*
*****************************************************************************/
static nsresult CompareNodeToRange(nsINode* aNode, nsRange* aRange,
bool* outNodeBefore, bool* outNodeAfter);
/**
* Return true if any part of (aNode, aStartOffset) .. (aNode, aEndOffset)
* overlaps any nsRange in aNode's GetNextRangeCommonAncestor ranges (i.e.
* where aNode is a descendant of a range's common ancestor node).
* If a nsRange starts in (aNode, aEndOffset) or if it ends in
* (aNode, aStartOffset) then it is non-overlapping and the result is false
* for that nsRange. Collapsed ranges always counts as non-overlapping.
*/
static bool IsNodeSelected(nsINode* aNode, uint32_t aStartOffset,
uint32_t aEndOffset);
/**
* 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:
void RegisterCommonAncestor(nsINode* aNode);
void UnregisterCommonAncestor(nsINode* aNode, bool aIsUnlinking);
nsINode* IsValidBoundary(nsINode* aNode) const {
return ComputeRootNode(aNode);
}
/**
* XXX nsRange should accept 0 - UINT32_MAX as offset. However, users of
* nsRange treat offset as int32_t. Additionally, some other internal
* APIs like nsINode::ComputeIndexOf() use int32_t. Therefore,
* nsRange should accept only 0 - INT32_MAX as valid offset for now.
*/
static bool IsValidOffset(uint32_t aOffset) { return aOffset <= INT32_MAX; }
static bool IsValidOffset(nsINode* aNode, uint32_t aOffset);
// CharacterDataChanged set aNotInsertedYet to true to disable an 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.
MOZ_CAN_RUN_SCRIPT_BOUNDARY
void DoSetRange(const RawRangeBoundary& lowerBound,
const RawRangeBoundary& upperBound, nsINode* aRoot,
bool aNotInsertedYet = false);
/**
* For a range for which IsInSelection() is true, return the common 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 GetCommonAncestor 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* GetRegisteredCommonAncestor();
// Helper to IsNodeSelected.
static bool IsNodeInSortedRanges(nsINode* aNode, uint32_t aStartOffset,
uint32_t aEndOffset,
const nsTArray<const nsRange*>& aRanges,
size_t aRangeStart, size_t aRangeEnd);
// 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;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
public:
explicit AutoCalledByJSRestore(
nsRange& aRange MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mRange(aRange), mOldValue(aRange.mCalledByJS) {
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
}
~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->GetRegisteredCommonAncestor();
}
~AutoInvalidateSelection();
nsRange* mRange;
RefPtr<nsINode> mCommonAncestor;
static bool sIsNested;
};
RefPtr<mozilla::dom::Document> mOwner;
nsCOMPtr<nsINode> mRoot;
// mRegisteredCommonAncestor is only non-null when the range
// IsInSelection(). It's kept alive via mStartContainer/mEndContainer,
// because we update it any time those could become disconnected from it.
nsINode* MOZ_NON_OWNING_REF mRegisteredCommonAncestor;
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;
RangeBoundary mStart;
RangeBoundary mEnd;
bool mIsPositioned : 1;
bool mIsGenerated : 1;
bool mCalledByJS : 1;
};
#endif /* nsRange_h___ */
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