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gecko-dev/editor/libeditor/EditorUtils.h

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/* -*- 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 mozilla_EditorUtils_h
#define mozilla_EditorUtils_h
#include "mozilla/ContentIterator.h"
#include "mozilla/EditAction.h"
#include "mozilla/EditorBase.h"
#include "mozilla/EditorDOMPoint.h"
#include "mozilla/RangeBoundary.h"
#include "mozilla/Result.h"
#include "mozilla/dom/HTMLBRElement.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/dom/StaticRange.h"
#include "nsAtom.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nscore.h"
#include "nsDebug.h"
#include "nsDirection.h"
#include "nsRange.h"
#include "nsString.h"
class nsISimpleEnumerator;
class nsITransferable;
namespace mozilla {
class MoveNodeResult;
template <class T>
class OwningNonNull;
namespace dom {
class Element;
class Text;
} // namespace dom
/***************************************************************************
* EditResult returns nsresult and preferred point where selection should be
* collapsed or the range where selection should select.
*
* NOTE: If we stop modifying selection at every DOM tree change, perhaps,
* the following classes need to inherit this class.
*/
class MOZ_STACK_CLASS EditResult final {
public:
bool Succeeded() const { return NS_SUCCEEDED(mRv); }
bool Failed() const { return NS_FAILED(mRv); }
nsresult Rv() const { return mRv; }
bool EditorDestroyed() const { return mRv == NS_ERROR_EDITOR_DESTROYED; }
const EditorDOMPoint& PointRefToCollapseSelection() const {
MOZ_DIAGNOSTIC_ASSERT(mStartPoint.IsSet());
MOZ_DIAGNOSTIC_ASSERT(mStartPoint == mEndPoint);
return mStartPoint;
}
const EditorDOMPoint& StartPointRef() const { return mStartPoint; }
const EditorDOMPoint& EndPointRef() const { return mEndPoint; }
already_AddRefed<dom::StaticRange> CreateStaticRange() const {
return dom::StaticRange::Create(mStartPoint.ToRawRangeBoundary(),
mEndPoint.ToRawRangeBoundary(),
IgnoreErrors());
}
already_AddRefed<nsRange> CreateRange() const {
return nsRange::Create(mStartPoint.ToRawRangeBoundary(),
mEndPoint.ToRawRangeBoundary(), IgnoreErrors());
}
EditResult() = delete;
explicit EditResult(nsresult aRv) : mRv(aRv) {
MOZ_DIAGNOSTIC_ASSERT(NS_FAILED(mRv));
}
template <typename PT, typename CT>
explicit EditResult(const EditorDOMPointBase<PT, CT>& aPointToPutCaret)
: mRv(aPointToPutCaret.IsSet() ? NS_OK : NS_ERROR_FAILURE),
mStartPoint(aPointToPutCaret),
mEndPoint(aPointToPutCaret) {}
template <typename SPT, typename SCT, typename EPT, typename ECT>
EditResult(const EditorDOMPointBase<SPT, SCT>& aStartPoint,
const EditorDOMPointBase<EPT, ECT>& aEndPoint)
: mRv(aStartPoint.IsSet() && aEndPoint.IsSet() ? NS_OK
: NS_ERROR_FAILURE),
mStartPoint(aStartPoint),
mEndPoint(aEndPoint) {}
EditResult(const EditResult& aOther) = delete;
EditResult& operator=(const EditResult& aOther) = delete;
EditResult(EditResult&& aOther) = default;
EditResult& operator=(EditResult&& aOther) = default;
private:
nsresult mRv;
EditorDOMPoint mStartPoint;
EditorDOMPoint mEndPoint;
};
/***************************************************************************
* EditActionResult is useful to return multiple results of an editor
* action handler without out params.
* Note that when you return an anonymous instance from a method, you should
* use EditActionIgnored(), EditActionHandled() or EditActionCanceled() for
* easier to read. In other words, EditActionResult should be used when
* declaring return type of a method, being an argument or defined as a local
* variable.
*/
class MOZ_STACK_CLASS EditActionResult final {
public:
bool Succeeded() const { return NS_SUCCEEDED(mRv); }
bool Failed() const { return NS_FAILED(mRv); }
nsresult Rv() const { return mRv; }
bool Canceled() const { return mCanceled; }
bool Handled() const { return mHandled; }
bool Ignored() const { return !mCanceled && !mHandled; }
bool EditorDestroyed() const { return mRv == NS_ERROR_EDITOR_DESTROYED; }
EditActionResult SetResult(nsresult aRv) {
mRv = aRv;
return *this;
}
EditActionResult MarkAsCanceled() {
mCanceled = true;
return *this;
}
EditActionResult MarkAsHandled() {
mHandled = true;
return *this;
}
explicit EditActionResult(nsresult aRv)
: mRv(aRv), mCanceled(false), mHandled(false) {}
EditActionResult& operator|=(const EditActionResult& aOther) {
mCanceled |= aOther.mCanceled;
mHandled |= aOther.mHandled;
// When both result are same, keep the result.
if (mRv == aOther.mRv) {
return *this;
}
// If one of the result is NS_ERROR_EDITOR_DESTROYED, use it since it's
// the most important error code for editor.
if (EditorDestroyed() || aOther.EditorDestroyed()) {
mRv = NS_ERROR_EDITOR_DESTROYED;
}
// If one of the results is error, use NS_ERROR_FAILURE.
else if (Failed() || aOther.Failed()) {
mRv = NS_ERROR_FAILURE;
} else {
// Otherwise, use generic success code, NS_OK.
mRv = NS_OK;
}
return *this;
}
EditActionResult& operator|=(const MoveNodeResult& aMoveNodeResult);
private:
nsresult mRv;
bool mCanceled;
bool mHandled;
EditActionResult(nsresult aRv, bool aCanceled, bool aHandled)
: mRv(aRv), mCanceled(aCanceled), mHandled(aHandled) {}
EditActionResult()
: mRv(NS_ERROR_NOT_INITIALIZED), mCanceled(false), mHandled(false) {}
friend EditActionResult EditActionIgnored(nsresult aRv);
friend EditActionResult EditActionHandled(nsresult aRv);
friend EditActionResult EditActionCanceled(nsresult aRv);
};
/***************************************************************************
* When an edit action handler (or its helper) does nothing,
* EditActionIgnored should be returned.
*/
inline EditActionResult EditActionIgnored(nsresult aRv = NS_OK) {
return EditActionResult(aRv, false, false);
}
/***************************************************************************
* When an edit action handler (or its helper) handled and not canceled,
* EditActionHandled should be returned.
*/
inline EditActionResult EditActionHandled(nsresult aRv = NS_OK) {
return EditActionResult(aRv, false, true);
}
/***************************************************************************
* When an edit action handler (or its helper) handled and canceled,
* EditActionHandled should be returned.
*/
inline EditActionResult EditActionCanceled(nsresult aRv = NS_OK) {
return EditActionResult(aRv, true, true);
}
/***************************************************************************
* CreateNodeResultBase is a simple class for CreateSomething() methods
* which want to return new node.
*/
template <typename NodeType>
class CreateNodeResultBase;
typedef CreateNodeResultBase<dom::Element> CreateElementResult;
template <typename NodeType>
class MOZ_STACK_CLASS CreateNodeResultBase final {
typedef CreateNodeResultBase<NodeType> SelfType;
public:
bool Succeeded() const { return NS_SUCCEEDED(mRv); }
bool Failed() const { return NS_FAILED(mRv); }
nsresult Rv() const { return mRv; }
bool EditorDestroyed() const { return mRv == NS_ERROR_EDITOR_DESTROYED; }
NodeType* GetNewNode() const { return mNode; }
CreateNodeResultBase() = delete;
explicit CreateNodeResultBase(nsresult aRv) : mRv(aRv) {
MOZ_DIAGNOSTIC_ASSERT(NS_FAILED(mRv));
}
explicit CreateNodeResultBase(NodeType* aNode)
: mNode(aNode), mRv(aNode ? NS_OK : NS_ERROR_FAILURE) {}
explicit CreateNodeResultBase(RefPtr<NodeType>&& aNode)
: mNode(std::move(aNode)), mRv(mNode.get() ? NS_OK : NS_ERROR_FAILURE) {}
CreateNodeResultBase(const SelfType& aOther) = delete;
SelfType& operator=(const SelfType& aOther) = delete;
CreateNodeResultBase(SelfType&& aOther) = default;
SelfType& operator=(SelfType&& aOther) = default;
already_AddRefed<NodeType> forget() {
mRv = NS_ERROR_NOT_INITIALIZED;
return mNode.forget();
}
private:
RefPtr<NodeType> mNode;
nsresult mRv;
};
/***************************************************************************
* MoveNodeResult is a simple class for MoveSomething() methods.
* This holds error code and next insertion point if moving contents succeeded.
*/
class MOZ_STACK_CLASS MoveNodeResult final {
public:
bool Succeeded() const { return NS_SUCCEEDED(mRv); }
bool Failed() const { return NS_FAILED(mRv); }
bool Handled() const { return mHandled; }
bool Ignored() const { return !mHandled; }
nsresult Rv() const { return mRv; }
bool EditorDestroyed() const { return mRv == NS_ERROR_EDITOR_DESTROYED; }
const EditorDOMPoint& NextInsertionPointRef() const {
return mNextInsertionPoint;
}
EditorDOMPoint NextInsertionPoint() const { return mNextInsertionPoint; }
void MarkAsHandled() { mHandled = true; }
MoveNodeResult() : mRv(NS_ERROR_NOT_INITIALIZED), mHandled(false) {}
explicit MoveNodeResult(nsresult aRv) : mRv(aRv), mHandled(false) {
MOZ_DIAGNOSTIC_ASSERT(NS_FAILED(mRv));
}
MoveNodeResult(const MoveNodeResult& aOther) = delete;
MoveNodeResult& operator=(const MoveNodeResult& aOther) = delete;
MoveNodeResult(MoveNodeResult&& aOther) = default;
MoveNodeResult& operator=(MoveNodeResult&& aOther) = default;
MoveNodeResult& operator|=(const MoveNodeResult& aOther) {
mHandled |= aOther.mHandled;
// When both result are same, keep the result but use newer point.
if (mRv == aOther.mRv) {
mNextInsertionPoint = aOther.mNextInsertionPoint;
return *this;
}
// If one of the result is NS_ERROR_EDITOR_DESTROYED, use it since it's
// the most important error code for editor.
if (EditorDestroyed() || aOther.EditorDestroyed()) {
mRv = NS_ERROR_EDITOR_DESTROYED;
mNextInsertionPoint.Clear();
return *this;
}
// If the other one has not been set explicit nsresult, keep current
// value.
if (aOther.mRv == NS_ERROR_NOT_INITIALIZED) {
return *this;
}
// If this one has not been set explicit nsresult, copy the other one's.
if (mRv == NS_ERROR_NOT_INITIALIZED) {
mRv = aOther.mRv;
mNextInsertionPoint = aOther.mNextInsertionPoint;
return *this;
}
// If one of the results is error, use NS_ERROR_FAILURE.
if (Failed() || aOther.Failed()) {
mRv = NS_ERROR_FAILURE;
mNextInsertionPoint.Clear();
return *this;
}
// Otherwise, use generic success code, NS_OK, and use newer point.
mRv = NS_OK;
mNextInsertionPoint = aOther.mNextInsertionPoint;
return *this;
}
private:
template <typename PT, typename CT>
explicit MoveNodeResult(const EditorDOMPointBase<PT, CT>& aNextInsertionPoint,
bool aHandled)
: mNextInsertionPoint(aNextInsertionPoint),
mRv(aNextInsertionPoint.IsSet() ? NS_OK : NS_ERROR_FAILURE),
mHandled(aHandled && aNextInsertionPoint.IsSet()) {
if (mNextInsertionPoint.IsSet()) {
AutoEditorDOMPointChildInvalidator computeOffsetAndForgetChild(
mNextInsertionPoint);
}
}
MoveNodeResult(nsINode* aParentNode, uint32_t aOffsetOfNextInsertionPoint,
bool aHandled) {
if (!aParentNode) {
mRv = NS_ERROR_FAILURE;
mHandled = false;
return;
}
aOffsetOfNextInsertionPoint =
std::min(aOffsetOfNextInsertionPoint, aParentNode->Length());
mNextInsertionPoint.Set(aParentNode, aOffsetOfNextInsertionPoint);
mRv = mNextInsertionPoint.IsSet() ? NS_OK : NS_ERROR_FAILURE;
mHandled = aHandled && mNextInsertionPoint.IsSet();
}
EditorDOMPoint mNextInsertionPoint;
nsresult mRv;
bool mHandled;
friend MoveNodeResult MoveNodeIgnored(nsINode* aParentNode,
uint32_t aOffsetOfNextInsertionPoint);
friend MoveNodeResult MoveNodeHandled(nsINode* aParentNode,
uint32_t aOffsetOfNextInsertionPoint);
template <typename PT, typename CT>
friend MoveNodeResult MoveNodeIgnored(
const EditorDOMPointBase<PT, CT>& aNextInsertionPoint);
template <typename PT, typename CT>
friend MoveNodeResult MoveNodeHandled(
const EditorDOMPointBase<PT, CT>& aNextInsertionPoint);
};
/***************************************************************************
* When a move node handler (or its helper) does nothing,
* MoveNodeIgnored should be returned.
*/
inline MoveNodeResult MoveNodeIgnored(nsINode* aParentNode,
uint32_t aOffsetOfNextInsertionPoint) {
return MoveNodeResult(aParentNode, aOffsetOfNextInsertionPoint, false);
}
template <typename PT, typename CT>
inline MoveNodeResult MoveNodeIgnored(
const EditorDOMPointBase<PT, CT>& aNextInsertionPoint) {
return MoveNodeResult(aNextInsertionPoint, false);
}
/***************************************************************************
* When a move node handler (or its helper) handled and not canceled,
* MoveNodeHandled should be returned.
*/
inline MoveNodeResult MoveNodeHandled(nsINode* aParentNode,
uint32_t aOffsetOfNextInsertionPoint) {
return MoveNodeResult(aParentNode, aOffsetOfNextInsertionPoint, true);
}
template <typename PT, typename CT>
inline MoveNodeResult MoveNodeHandled(
const EditorDOMPointBase<PT, CT>& aNextInsertionPoint) {
return MoveNodeResult(aNextInsertionPoint, true);
}
/***************************************************************************
* SplitNodeResult is a simple class for
* HTMLEditor::SplitNodeDeepWithTransaction().
* This makes the callers' code easier to read.
*/
class MOZ_STACK_CLASS SplitNodeResult final {
public:
bool Succeeded() const { return NS_SUCCEEDED(mRv); }
bool Failed() const { return NS_FAILED(mRv); }
nsresult Rv() const { return mRv; }
bool Handled() const { return mPreviousNode || mNextNode; }
bool EditorDestroyed() const { return mRv == NS_ERROR_EDITOR_DESTROYED; }
/**
* DidSplit() returns true if a node was actually split.
*/
bool DidSplit() const { return mPreviousNode && mNextNode; }
/**
* GetLeftNode() simply returns the left node which was created at splitting.
* This returns nullptr if the node wasn't split.
*/
nsIContent* GetLeftNode() const {
return mPreviousNode && mNextNode ? mPreviousNode.get() : nullptr;
}
/**
* GetRightNode() simply returns the right node which was split.
* This won't return nullptr unless failed to split due to invalid arguments.
*/
nsIContent* GetRightNode() const {
if (mGivenSplitPoint.IsSet()) {
return mGivenSplitPoint.GetChild();
}
return mPreviousNode && !mNextNode ? mPreviousNode : mNextNode;
}
/**
* GetPreviousNode() returns previous node at the split point.
*/
nsIContent* GetPreviousNode() const {
if (mGivenSplitPoint.IsSet()) {
return mGivenSplitPoint.IsEndOfContainer() ? mGivenSplitPoint.GetChild()
: nullptr;
}
return mPreviousNode;
}
/**
* GetNextNode() returns next node at the split point.
*/
nsIContent* GetNextNode() const {
if (mGivenSplitPoint.IsSet()) {
return !mGivenSplitPoint.IsEndOfContainer() ? mGivenSplitPoint.GetChild()
: nullptr;
}
return mNextNode;
}
/**
* SplitPoint() returns the split point in the container.
* This is useful when callers insert an element at split point with
* EditorBase::CreateNodeWithTransaction() or something similar methods.
*
* Note that the result is EditorRawDOMPoint but the nodes are grabbed
* by this instance. Therefore, the life time of both container node
* and child node are guaranteed while using the result temporarily.
*/
EditorDOMPoint SplitPoint() const {
if (Failed()) {
return EditorDOMPoint();
}
if (mGivenSplitPoint.IsSet()) {
return EditorDOMPoint(mGivenSplitPoint);
}
if (!mPreviousNode) {
return EditorDOMPoint(mNextNode);
}
EditorDOMPoint point(mPreviousNode);
DebugOnly<bool> advanced = point.AdvanceOffset();
NS_WARNING_ASSERTION(advanced,
"Failed to advance offset to after previous node");
return point;
}
/**
* This constructor shouldn't be used by anybody except methods which
* use this as result when it succeeds.
*
* @param aPreviousNodeOfSplitPoint Previous node immediately before
* split point.
* @param aNextNodeOfSplitPoint Next node immediately after split
* point.
*/
SplitNodeResult(nsIContent* aPreviousNodeOfSplitPoint,
nsIContent* aNextNodeOfSplitPoint)
: mPreviousNode(aPreviousNodeOfSplitPoint),
mNextNode(aNextNodeOfSplitPoint),
mRv(NS_OK) {
MOZ_DIAGNOSTIC_ASSERT(mPreviousNode || mNextNode);
}
/**
* This constructor should be used when the method didn't split any nodes
* but want to return given split point as right point.
*/
explicit SplitNodeResult(const EditorRawDOMPoint& aGivenSplitPoint)
: mGivenSplitPoint(aGivenSplitPoint), mRv(NS_OK) {
MOZ_DIAGNOSTIC_ASSERT(mGivenSplitPoint.IsSet());
}
/**
* This constructor shouldn't be used by anybody except methods which
* use this as error result when it fails.
*/
explicit SplitNodeResult(nsresult aRv) : mRv(aRv) {
MOZ_DIAGNOSTIC_ASSERT(NS_FAILED(mRv));
}
private:
// When methods which return this class split some nodes actually, they
// need to set a set of left node and right node to this class. However,
// one or both of them may be moved or removed by mutation observer.
// In such case, we cannot represent the point with EditorDOMPoint since
// it requires current container node. Therefore, we need to use
// nsCOMPtr<nsIContent> here instead.
nsCOMPtr<nsIContent> mPreviousNode;
nsCOMPtr<nsIContent> mNextNode;
// Methods which return this class may not split any nodes actually. Then,
// they may want to return given split point as is since such behavior makes
// their callers simpler. In this case, the point may be in a text node
// which cannot be represented as a node. Therefore, we need EditorDOMPoint
// for representing the point.
EditorDOMPoint mGivenSplitPoint;
nsresult mRv;
SplitNodeResult() = delete;
};
/***************************************************************************
* SplitRangeOffFromNodeResult class is a simple class for methods which split a
* node at 2 points for making part of the node split off from the node.
*/
class MOZ_STACK_CLASS SplitRangeOffFromNodeResult final {
public:
bool Succeeded() const { return NS_SUCCEEDED(mRv); }
bool Failed() const { return NS_FAILED(mRv); }
nsresult Rv() const { return mRv; }
bool EditorDestroyed() const { return mRv == NS_ERROR_EDITOR_DESTROYED; }
/**
* GetLeftContent() returns new created node before the part of quarried out.
* This may return nullptr if the method didn't split at start edge of
* the node.
*/
nsIContent* GetLeftContent() const { return mLeftContent; }
dom::Element* GetLeftContentAsElement() const {
return dom::Element::FromNodeOrNull(mLeftContent);
}
/**
* GetMiddleContent() returns new created node between left node and right
* node. I.e., this is quarried out from the node. This may return nullptr
* if the method unwrapped the middle node.
*/
nsIContent* GetMiddleContent() const { return mMiddleContent; }
dom::Element* GetMiddleContentAsElement() const {
return dom::Element::FromNodeOrNull(mMiddleContent);
}
/**
* GetRightContent() returns the right node after the part of quarried out.
* This may return nullptr it the method didn't split at end edge of the
* node.
*/
nsIContent* GetRightContent() const { return mRightContent; }
dom::Element* GetRightContentAsElement() const {
return dom::Element::FromNodeOrNull(mRightContent);
}
SplitRangeOffFromNodeResult(nsIContent* aLeftContent,
nsIContent* aMiddleContent,
nsIContent* aRightContent)
: mLeftContent(aLeftContent),
mMiddleContent(aMiddleContent),
mRightContent(aRightContent),
mRv(NS_OK) {}
SplitRangeOffFromNodeResult(SplitNodeResult& aSplitResultAtLeftOfMiddleNode,
SplitNodeResult& aSplitResultAtRightOfMiddleNode)
: mRv(NS_OK) {
if (aSplitResultAtLeftOfMiddleNode.Succeeded()) {
mLeftContent = aSplitResultAtLeftOfMiddleNode.GetPreviousNode();
}
if (aSplitResultAtRightOfMiddleNode.Succeeded()) {
mRightContent = aSplitResultAtRightOfMiddleNode.GetNextNode();
mMiddleContent = aSplitResultAtRightOfMiddleNode.GetPreviousNode();
}
if (!mMiddleContent && aSplitResultAtLeftOfMiddleNode.Succeeded()) {
mMiddleContent = aSplitResultAtLeftOfMiddleNode.GetNextNode();
}
}
explicit SplitRangeOffFromNodeResult(nsresult aRv) : mRv(aRv) {
MOZ_DIAGNOSTIC_ASSERT(NS_FAILED(mRv));
}
SplitRangeOffFromNodeResult(const SplitRangeOffFromNodeResult& aOther) =
delete;
SplitRangeOffFromNodeResult& operator=(
const SplitRangeOffFromNodeResult& aOther) = delete;
SplitRangeOffFromNodeResult(SplitRangeOffFromNodeResult&& aOther) = default;
SplitRangeOffFromNodeResult& operator=(SplitRangeOffFromNodeResult&& aOther) =
default;
private:
nsCOMPtr<nsIContent> mLeftContent;
nsCOMPtr<nsIContent> mMiddleContent;
nsCOMPtr<nsIContent> mRightContent;
nsresult mRv;
SplitRangeOffFromNodeResult() = delete;
};
/***************************************************************************
* SplitRangeOffResult class is a simple class for methods which splits
* specific ancestor elements at 2 DOM points.
*/
class MOZ_STACK_CLASS SplitRangeOffResult final {
public:
bool Succeeded() const { return NS_SUCCEEDED(mRv); }
bool Failed() const { return NS_FAILED(mRv); }
nsresult Rv() const { return mRv; }
bool Handled() const { return mHandled; }
bool EditorDestroyed() const { return mRv == NS_ERROR_EDITOR_DESTROYED; }
/**
* This is at right node of split at start point.
*/
const EditorDOMPoint& SplitPointAtStart() const { return mSplitPointAtStart; }
/**
* This is at right node of split at end point. I.e., not in the range.
* This is after the range.
*/
const EditorDOMPoint& SplitPointAtEnd() const { return mSplitPointAtEnd; }
SplitRangeOffResult() = delete;
/**
* Constructor for success case.
*
* @param aTrackedRangeStart This should be at topmost right node
* child at start point if actually split
* there, or at start point to be tried
* to split. Note that if the method
* allows to run script after splitting
* at start point, the point should be
* tracked with AutoTrackDOMPoint.
* @param aSplitNodeResultAtStart Raw split node result at start point.
* @param aTrackedRangeEnd This should be at topmost right node
* child at end point if actually split
* here, or at end point to be tried to
* split. As same as aTrackedRangeStart,
* this value should be tracked while
* running some script.
* @param aSplitNodeResultAtEnd Raw split node result at start point.
*/
SplitRangeOffResult(const EditorDOMPoint& aTrackedRangeStart,
const SplitNodeResult& aSplitNodeResultAtStart,
const EditorDOMPoint& aTrackedRangeEnd,
const SplitNodeResult& aSplitNodeResultAtEnd)
: mSplitPointAtStart(aTrackedRangeStart),
mSplitPointAtEnd(aTrackedRangeEnd),
mRv(NS_OK),
mHandled(aSplitNodeResultAtStart.Handled() ||
aSplitNodeResultAtEnd.Handled()) {
MOZ_ASSERT(mSplitPointAtStart.IsSet());
MOZ_ASSERT(mSplitPointAtEnd.IsSet());
MOZ_ASSERT(aSplitNodeResultAtStart.Succeeded());
MOZ_ASSERT(aSplitNodeResultAtEnd.Succeeded());
}
explicit SplitRangeOffResult(nsresult aRv) : mRv(aRv), mHandled(false) {
MOZ_DIAGNOSTIC_ASSERT(NS_FAILED(mRv));
}
SplitRangeOffResult(const SplitRangeOffResult& aOther) = delete;
SplitRangeOffResult& operator=(const SplitRangeOffResult& aOther) = delete;
SplitRangeOffResult(SplitRangeOffResult&& aOther) = default;
SplitRangeOffResult& operator=(SplitRangeOffResult&& aOther) = default;
private:
EditorDOMPoint mSplitPointAtStart;
EditorDOMPoint mSplitPointAtEnd;
// If you need to store previous and/or next node at start/end point,
// you might be able to use `SplitNodeResult::GetPreviousNode()` etc in the
// constructor only when `SplitNodeResult::Handled()` returns true. But
// the node might have gone with another DOM tree mutation. So, be careful
// if you do it.
nsresult mRv;
bool mHandled;
};
/***************************************************************************
* stack based helper class for calling EditorBase::EndTransaction() after
* EditorBase::BeginTransaction(). This shouldn't be used in editor classes
* or helper classes while an edit action is being handled. Use
* AutoTransactionBatch in such cases since it uses non-virtual internal
* methods.
***************************************************************************/
class MOZ_RAII AutoTransactionBatchExternal final {
public:
MOZ_CAN_RUN_SCRIPT explicit AutoTransactionBatchExternal(
EditorBase& aEditorBase)
: mEditorBase(aEditorBase) {
MOZ_KnownLive(mEditorBase).BeginTransaction();
}
MOZ_CAN_RUN_SCRIPT ~AutoTransactionBatchExternal() {
MOZ_KnownLive(mEditorBase).EndTransaction();
}
private:
EditorBase& mEditorBase;
};
/******************************************************************************
* AutoSelectionRangeArray stores all ranges in `aSelection`.
* Note that modifying the ranges means modifing the selection ranges.
*****************************************************************************/
class MOZ_STACK_CLASS AutoSelectionRangeArray final {
public:
explicit AutoSelectionRangeArray(dom::Selection& aSelection) {
uint32_t rangeCount = aSelection.RangeCount();
for (uint32_t i = 0; i < rangeCount; i++) {
mRanges.AppendElement(*aSelection.GetRangeAt(i));
}
}
AutoTArray<mozilla::OwningNonNull<nsRange>, 8> mRanges;
};
/******************************************************************************
* AutoRangeArray stores ranges which do no belong any `Selection`.
* So, different from `AutoSelectionRangeArray`, this can be used for
* ranges which may need to be modified before touching the DOM tree,
* but does not want to modify `Selection` for the performance.
*****************************************************************************/
class MOZ_STACK_CLASS AutoRangeArray final {
public:
explicit AutoRangeArray(const dom::Selection& aSelection) {
Initialize(aSelection);
}
void Initialize(const dom::Selection& aSelection) {
mDirection = aSelection.GetDirection();
mRanges.Clear();
for (uint32_t i = 0; i < aSelection.RangeCount(); i++) {
mRanges.AppendElement(aSelection.GetRangeAt(i)->CloneRange());
if (aSelection.GetRangeAt(i) == aSelection.GetAnchorFocusRange()) {
mAnchorFocusRange = mRanges.LastElement();
}
}
}
/**
* EnsureOnlyEditableRanges() removes ranges which cannot modify.
* Note that this is designed only for `HTMLEditor` because this must not
* be required by `TextEditor`.
*/
void EnsureOnlyEditableRanges(const dom::Element& aEditingHost);
static bool IsEditableRange(const dom::AbstractRange& aRange,
const dom::Element& aEditingHost);
/**
* IsAtLeastOneContainerOfRangeBoundariesInclusiveDescendantOf() returns true
* if at least one of the containers of the range boundaries is an inclusive
* descendant of aContent.
*/
bool IsAtLeastOneContainerOfRangeBoundariesInclusiveDescendantOf(
const nsIContent& aContent) const {
for (const OwningNonNull<nsRange>& range : mRanges) {
nsINode* startContainer = range->GetStartContainer();
if (startContainer &&
startContainer->IsInclusiveDescendantOf(&aContent)) {
return true;
}
nsINode* endContainer = range->GetEndContainer();
if (startContainer == endContainer) {
continue;
}
if (endContainer && endContainer->IsInclusiveDescendantOf(&aContent)) {
return true;
}
}
return false;
}
auto& Ranges() { return mRanges; }
const auto& Ranges() const { return mRanges; }
auto& FirstRangeRef() { return mRanges[0]; }
const auto& FirstRangeRef() const { return mRanges[0]; }
template <template <typename> typename StrongPtrType>
AutoTArray<StrongPtrType<nsRange>, 8> CloneRanges() const {
AutoTArray<StrongPtrType<nsRange>, 8> ranges;
for (const auto& range : mRanges) {
ranges.AppendElement(range->CloneRange());
}
return ranges;
}
EditorDOMPoint GetStartPointOfFirstRange() const {
if (mRanges.IsEmpty() || !mRanges[0]->IsPositioned()) {
return EditorDOMPoint();
}
return EditorDOMPoint(mRanges[0]->StartRef());
}
EditorDOMPoint GetEndPointOfFirstRange() const {
if (mRanges.IsEmpty() || !mRanges[0]->IsPositioned()) {
return EditorDOMPoint();
}
return EditorDOMPoint(mRanges[0]->EndRef());
}
nsresult SelectNode(nsINode& aNode) {
mRanges.Clear();
if (!mAnchorFocusRange) {
mAnchorFocusRange = nsRange::Create(&aNode);
if (!mAnchorFocusRange) {
return NS_ERROR_FAILURE;
}
}
ErrorResult error;
mAnchorFocusRange->SelectNode(aNode, error);
if (error.Failed()) {
mAnchorFocusRange = nullptr;
return error.StealNSResult();
}
mRanges.AppendElement(*mAnchorFocusRange);
return NS_OK;
}
/**
* ExtendAnchorFocusRangeFor() extends the anchor-focus range for deleting
* content for aDirectionAndAmount. The range won't be extended to outer of
* selection limiter. Note that if a range is extened, the range is
* recreated. Therefore, caller cannot cache pointer of any ranges before
* calling this.
*/
[[nodiscard]] MOZ_CAN_RUN_SCRIPT Result<nsIEditor::EDirection, nsresult>
ExtendAnchorFocusRangeFor(const EditorBase& aEditorBase,
nsIEditor::EDirection aDirectionAndAmount);
/**
* For compatiblity with the other browsers, we should shrink ranges to
* start from an atomic content and/or end after one instead of start
* from end of a preceding text node and end by start of a follwing text
* node. Returns true if this modifies a range.
*/
enum class IfSelectingOnlyOneAtomicContent {
Collapse, // Collapse to the range selecting only one atomic content to
// start or after of it. Whether to collapse start or after
// it depends on aDirectionAndAmount. This is ignored if
// there are multiple ranges.
KeepSelecting, // Won't collapse the range.
};
Result<bool, nsresult> ShrinkRangesIfStartFromOrEndAfterAtomicContent(
const HTMLEditor& aHTMLEditor, nsIEditor::EDirection aDirectionAndAmount,
IfSelectingOnlyOneAtomicContent aIfSelectingOnlyOneAtomicContent,
const dom::Element* aEditingHost);
/**
* The following methods are same as `Selection`'s methods.
*/
bool IsCollapsed() const {
return mRanges.IsEmpty() ||
(mRanges.Length() == 1 && mRanges[0]->Collapsed());
}
template <typename PT, typename CT>
nsresult Collapse(const EditorDOMPointBase<PT, CT>& aPoint) {
mRanges.Clear();
if (!mAnchorFocusRange) {
ErrorResult error;
mAnchorFocusRange = nsRange::Create(aPoint.ToRawRangeBoundary(),
aPoint.ToRawRangeBoundary(), error);
if (error.Failed()) {
mAnchorFocusRange = nullptr;
return error.StealNSResult();
}
} else {
nsresult rv = mAnchorFocusRange->CollapseTo(aPoint.ToRawRangeBoundary());
if (NS_FAILED(rv)) {
mAnchorFocusRange = nullptr;
return rv;
}
}
mRanges.AppendElement(*mAnchorFocusRange);
return NS_OK;
}
template <typename SPT, typename SCT, typename EPT, typename ECT>
nsresult SetStartAndEnd(const EditorDOMPointBase<SPT, SCT>& aStart,
const EditorDOMPointBase<EPT, ECT>& aEnd) {
mRanges.Clear();
if (!mAnchorFocusRange) {
ErrorResult error;
mAnchorFocusRange = nsRange::Create(aStart.ToRawRangeBoundary(),
aEnd.ToRawRangeBoundary(), error);
if (error.Failed()) {
mAnchorFocusRange = nullptr;
return error.StealNSResult();
}
} else {
nsresult rv = mAnchorFocusRange->SetStartAndEnd(
aStart.ToRawRangeBoundary(), aEnd.ToRawRangeBoundary());
if (NS_FAILED(rv)) {
mAnchorFocusRange = nullptr;
return rv;
}
}
mRanges.AppendElement(*mAnchorFocusRange);
return NS_OK;
}
const nsRange* GetAnchorFocusRange() const { return mAnchorFocusRange; }
nsDirection GetDirection() const { return mDirection; }
const RangeBoundary& AnchorRef() const {
if (!mAnchorFocusRange) {
static RangeBoundary sEmptyRangeBoundary;
return sEmptyRangeBoundary;
}
return mDirection == nsDirection::eDirNext ? mAnchorFocusRange->StartRef()
: mAnchorFocusRange->EndRef();
}
nsINode* GetAnchorNode() const {
return AnchorRef().IsSet() ? AnchorRef().Container() : nullptr;
}
uint32_t GetAnchorOffset() const {
return AnchorRef().IsSet()
? AnchorRef()
.Offset(RangeBoundary::OffsetFilter::kValidOffsets)
.valueOr(0)
: 0;
}
nsIContent* GetChildAtAnchorOffset() const {
return AnchorRef().IsSet() ? AnchorRef().GetChildAtOffset() : nullptr;
}
const RangeBoundary& FocusRef() const {
if (!mAnchorFocusRange) {
static RangeBoundary sEmptyRangeBoundary;
return sEmptyRangeBoundary;
}
return mDirection == nsDirection::eDirNext ? mAnchorFocusRange->EndRef()
: mAnchorFocusRange->StartRef();
}
nsINode* GetFocusNode() const {
return FocusRef().IsSet() ? FocusRef().Container() : nullptr;
}
uint32_t FocusOffset() const {
return FocusRef().IsSet()
? FocusRef()
.Offset(RangeBoundary::OffsetFilter::kValidOffsets)
.valueOr(0)
: 0;
}
nsIContent* GetChildAtFocusOffset() const {
return FocusRef().IsSet() ? FocusRef().GetChildAtOffset() : nullptr;
}
void RemoveAllRanges() {
mRanges.Clear();
mAnchorFocusRange = nullptr;
mDirection = nsDirection::eDirNext;
}
private:
AutoTArray<mozilla::OwningNonNull<nsRange>, 8> mRanges;
RefPtr<nsRange> mAnchorFocusRange;
nsDirection mDirection = nsDirection::eDirNext;
};
/******************************************************************************
* some helper classes for iterating the dom tree
*****************************************************************************/
class MOZ_RAII DOMIterator {
public:
explicit DOMIterator();
explicit DOMIterator(nsINode& aNode);
virtual ~DOMIterator() = default;
nsresult Init(nsRange& aRange);
nsresult Init(const RawRangeBoundary& aStartRef,
const RawRangeBoundary& aEndRef);
template <class NodeClass>
void AppendAllNodesToArray(
nsTArray<OwningNonNull<NodeClass>>& aArrayOfNodes) const;
/**
* AppendNodesToArray() calls aFunctor before appending found node to
* aArrayOfNodes. If aFunctor returns false, the node will be ignored.
* You can use aClosure instead of capturing something with lambda.
* Note that aNode is guaranteed that it's an instance of NodeClass
* or its sub-class.
* XXX If we can make type of aNode templated without std::function,
* it'd be better, though.
*/
typedef bool (*BoolFunctor)(nsINode& aNode, void* aClosure);
template <class NodeClass>
void AppendNodesToArray(BoolFunctor aFunctor,
nsTArray<OwningNonNull<NodeClass>>& aArrayOfNodes,
void* aClosure = nullptr) const;
protected:
ContentIteratorBase* mIter;
PostContentIterator mPostOrderIter;
};
class MOZ_RAII DOMSubtreeIterator final : public DOMIterator {
public:
explicit DOMSubtreeIterator();
virtual ~DOMSubtreeIterator() = default;
nsresult Init(nsRange& aRange);
private:
ContentSubtreeIterator mSubtreeIter;
explicit DOMSubtreeIterator(nsINode& aNode) = delete;
};
/**
* ReplaceRangeDataBase() represents range to be replaced and replacing string.
*/
template <typename EditorDOMPointType>
class MOZ_STACK_CLASS ReplaceRangeDataBase final {
public:
ReplaceRangeDataBase() = default;
template <typename OtherEditorDOMRangeType>
ReplaceRangeDataBase(const OtherEditorDOMRangeType& aRange,
const nsAString& aReplaceString)
: mRange(aRange), mReplaceString(aReplaceString) {}
template <typename StartPointType, typename EndPointType>
ReplaceRangeDataBase(const StartPointType& aStart, const EndPointType& aEnd,
const nsAString& aReplaceString)
: mRange(aStart, aEnd), mReplaceString(aReplaceString) {}
bool IsSet() const { return mRange.IsPositioned(); }
bool IsSetAndValid() const { return mRange.IsPositionedAndValid(); }
bool Collapsed() const { return mRange.Collapsed(); }
bool HasReplaceString() const { return !mReplaceString.IsEmpty(); }
const EditorDOMPointType& StartRef() const { return mRange.StartRef(); }
const EditorDOMPointType& EndRef() const { return mRange.EndRef(); }
const EditorDOMRangeBase<EditorDOMPointType>& RangeRef() const {
return mRange;
}
const nsString& ReplaceStringRef() const { return mReplaceString; }
template <typename PointType>
MOZ_NEVER_INLINE_DEBUG void SetStart(const PointType& aStart) {
mRange.SetStart(aStart);
}
template <typename PointType>
MOZ_NEVER_INLINE_DEBUG void SetEnd(const PointType& aEnd) {
mRange.SetEnd(aEnd);
}
template <typename StartPointType, typename EndPointType>
MOZ_NEVER_INLINE_DEBUG void SetStartAndEnd(const StartPointType& aStart,
const EndPointType& aEnd) {
mRange.SetRange(aStart, aEnd);
}
template <typename OtherEditorDOMRangeType>
MOZ_NEVER_INLINE_DEBUG void SetRange(const OtherEditorDOMRangeType& aRange) {
mRange = aRange;
}
void SetReplaceString(const nsAString& aReplaceString) {
mReplaceString = aReplaceString;
}
template <typename StartPointType, typename EndPointType>
MOZ_NEVER_INLINE_DEBUG void SetStartAndEnd(const StartPointType& aStart,
const EndPointType& aEnd,
const nsAString& aReplaceString) {
SetStartAndEnd(aStart, aEnd);
SetReplaceString(aReplaceString);
}
template <typename OtherEditorDOMRangeType>
MOZ_NEVER_INLINE_DEBUG void Set(const OtherEditorDOMRangeType& aRange,
const nsAString& aReplaceString) {
SetRange(aRange);
SetReplaceString(aReplaceString);
}
private:
EditorDOMRangeBase<EditorDOMPointType> mRange;
// This string may be used with ReplaceTextTransaction. Therefore, for
// avoiding memory copy, we should store it with nsString rather than
// nsAutoString.
nsString mReplaceString;
};
using ReplaceRangeData = ReplaceRangeDataBase<EditorDOMPoint>;
using ReplaceRangeInTextsData = ReplaceRangeDataBase<EditorDOMPointInText>;
class EditorUtils final {
public:
using EditorType = EditorBase::EditorType;
using Selection = dom::Selection;
/**
* IsDescendantOf() checks if aNode is a child or a descendant of aParent.
* aOutPoint is set to the child of aParent.
*
* @return true if aNode is a child or a descendant of aParent.
*/
static bool IsDescendantOf(const nsINode& aNode, const nsINode& aParent,
EditorRawDOMPoint* aOutPoint = nullptr);
static bool IsDescendantOf(const nsINode& aNode, const nsINode& aParent,
EditorDOMPoint* aOutPoint);
/**
* Returns true if aContent is a <br> element and it's marked as padding for
* empty editor.
*/
static bool IsPaddingBRElementForEmptyEditor(const nsIContent& aContent) {
const dom::HTMLBRElement* brElement =
dom::HTMLBRElement::FromNode(&aContent);
return brElement && brElement->IsPaddingForEmptyEditor();
}
/**
* Returns true if aContent is a <br> element and it's marked as padding for
* empty last line.
*/
static bool IsPaddingBRElementForEmptyLastLine(const nsIContent& aContent) {
const dom::HTMLBRElement* brElement =
dom::HTMLBRElement::FromNode(&aContent);
return brElement && brElement->IsPaddingForEmptyLastLine();
}
/**
* IsEditableContent() returns true if aContent's data or children is ediable
* for the given editor type. Be aware, returning true does NOT mean the
* node can be removed from its parent node, and returning false does NOT
* mean the node cannot be removed from the parent node.
* XXX May be the anonymous nodes in TextEditor not editable? If it's not
* so, we can get rid of aEditorType.
*/
static bool IsEditableContent(const nsIContent& aContent,
EditorType aEditorType) {
if (aEditorType == EditorType::HTML &&
(!aContent.IsEditable() || !aContent.IsInComposedDoc())) {
// FIXME(emilio): Why only for HTML editors? All content from the root
// content in text editors is also editable, so afaict we can remove the
// special-case.
return false;
}
return IsElementOrText(aContent);
}
/**
* Returns true if aContent is a usual element node (not padding <br> element
* for empty editor) or a text node. In other words, returns true if
* aContent is a usual element node or visible data node.
*/
static bool IsElementOrText(const nsIContent& aContent) {
if (aContent.IsText()) {
return true;
}
return aContent.IsElement() && !IsPaddingBRElementForEmptyEditor(aContent);
}
/**
* IsWhiteSpacePreformatted() checks the style info for the node for the
* preformatted text style. This does NOT flush layout.
*/
static bool IsWhiteSpacePreformatted(const nsIContent& aContent);
/**
* IsNewLinePreformatted() checks whether the linefeed characters are
* preformatted or collapsible white-spaces. This does NOT flush layout.
*/
static bool IsNewLinePreformatted(const nsIContent& aContent);
/**
* IsOnlyNewLinePreformatted() checks whether the linefeed characters are
* preformated but white-spaces are collapsed, or otherwise. I.e., this
* returns true only when `white-space:pre-line`.
*/
static bool IsOnlyNewLinePreformatted(const nsIContent& aContent);
/**
* Helper method for `AppendString()` and `AppendSubString()`. This should
* be called only when `aText` is in a password field. This method masks
* A part of or all of `aText` (`aStartOffsetInText` and later) should've
* been copied (apppended) to `aString`. `aStartOffsetInString` is where
* the password was appended into `aString`.
*/
static void MaskString(nsString& aString, const dom::Text& aTextNode,
uint32_t aStartOffsetInString,
uint32_t aStartOffsetInText);
static nsStaticAtom* GetTagNameAtom(const nsAString& aTagName) {
if (aTagName.IsEmpty()) {
return nullptr;
}
nsAutoString lowerTagName;
nsContentUtils::ASCIIToLower(aTagName, lowerTagName);
return NS_GetStaticAtom(lowerTagName);
}
static nsStaticAtom* GetAttributeAtom(const nsAString& aAttribute) {
if (aAttribute.IsEmpty()) {
return nullptr; // Don't use nsGkAtoms::_empty for attribute.
}
return NS_GetStaticAtom(aAttribute);
}
/**
* Helper method for deletion. When this returns true, Selection will be
* computed with nsFrameSelection that also requires flushed layout
* information.
*/
template <typename SelectionOrAutoRangeArray>
static bool IsFrameSelectionRequiredToExtendSelection(
nsIEditor::EDirection aDirectionAndAmount,
SelectionOrAutoRangeArray& aSelectionOrAutoRangeArray) {
switch (aDirectionAndAmount) {
case nsIEditor::eNextWord:
case nsIEditor::ePreviousWord:
case nsIEditor::eToBeginningOfLine:
case nsIEditor::eToEndOfLine:
return true;
case nsIEditor::ePrevious:
case nsIEditor::eNext:
return aSelectionOrAutoRangeArray.IsCollapsed();
default:
return false;
}
}
/**
* Returns true if aSelection includes the point in aParentContent.
*/
static bool IsPointInSelection(const Selection& aSelection,
const nsINode& aParentNode, uint32_t aOffset);
/**
* Create an nsITransferable instance which has kUnicodeMime and
* kMozTextInternal flavors.
*/
static Result<nsCOMPtr<nsITransferable>, nsresult>
CreateTransferableForPlainText(const dom::Document& aDocument);
};
} // namespace mozilla
#endif // #ifndef mozilla_EditorUtils_h
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