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gecko-dev/dom/base/nsRange.cpp

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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 nsIDOMRange object.
*/
#include "nscore.h"
#include "nsRange.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsIDOMNode.h"
#include "nsIDOMDocumentFragment.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsIDOMText.h"
#include "nsError.h"
#include "nsIContentIterator.h"
#include "nsIDOMNodeList.h"
#include "nsGkAtoms.h"
#include "nsContentUtils.h"
#include "nsGenericDOMDataNode.h"
#include "nsTextFrame.h"
#include "nsFontFaceList.h"
#include "mozilla/dom/DocumentFragment.h"
#include "mozilla/dom/DocumentType.h"
#include "mozilla/dom/RangeBinding.h"
#include "mozilla/dom/DOMRect.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/Selection.h"
#include "mozilla/Telemetry.h"
#include "mozilla/Likely.h"
#include "nsCSSFrameConstructor.h"
#include "nsStyleStruct.h"
#include "nsStyleStructInlines.h"
#include "nsComputedDOMStyle.h"
using namespace mozilla;
using namespace mozilla::dom;
JSObject*
nsRange::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return RangeBinding::Wrap(aCx, this, aGivenProto);
}
/******************************************************
* stack based utilty class for managing monitor
******************************************************/
static void InvalidateAllFrames(nsINode* aNode)
{
NS_PRECONDITION(aNode, "bad arg");
nsIFrame* frame = nullptr;
switch (aNode->NodeType()) {
case nsIDOMNode::TEXT_NODE:
case nsIDOMNode::ELEMENT_NODE:
{
nsIContent* content = static_cast<nsIContent*>(aNode);
frame = content->GetPrimaryFrame();
break;
}
case nsIDOMNode::DOCUMENT_NODE:
{
nsIDocument* doc = static_cast<nsIDocument*>(aNode);
nsIPresShell* shell = doc ? doc->GetShell() : nullptr;
frame = shell ? shell->GetRootFrame() : nullptr;
break;
}
}
for (nsIFrame* f = frame; f; f = f->GetNextContinuation()) {
f->InvalidateFrameSubtree();
}
}
// Utility routine to detect if a content node is completely contained in a range
// If outNodeBefore is returned true, then the node starts before the range does.
// If outNodeAfter is returned true, then the node ends after the range does.
// Note that both of the above might be true.
// If neither are true, the node is contained inside of the range.
// XXX - callers responsibility to ensure node in same doc as range!
// static
nsresult
nsRange::CompareNodeToRange(nsINode* aNode, nsRange* aRange,
bool *outNodeBefore, bool *outNodeAfter)
{
NS_ENSURE_STATE(aNode);
// create a pair of dom points that expresses location of node:
// NODE(start), NODE(end)
// Let incoming range be:
// {RANGE(start), RANGE(end)}
// if (RANGE(start) <= NODE(start)) and (RANGE(end) => NODE(end))
// then the Node is contained (completely) by the Range.
if (!aRange || !aRange->IsPositioned())
return NS_ERROR_UNEXPECTED;
// gather up the dom point info
int32_t nodeStart, nodeEnd;
nsINode* parent = aNode->GetParentNode();
if (!parent) {
// can't make a parent/offset pair to represent start or
// end of the root node, because it has no parent.
// so instead represent it by (node,0) and (node,numChildren)
parent = aNode;
nodeStart = 0;
nodeEnd = aNode->GetChildCount();
}
else {
nodeStart = parent->IndexOf(aNode);
nodeEnd = nodeStart + 1;
}
nsINode* rangeStartParent = aRange->GetStartParent();
nsINode* rangeEndParent = aRange->GetEndParent();
int32_t rangeStartOffset = aRange->StartOffset();
int32_t rangeEndOffset = aRange->EndOffset();
// is RANGE(start) <= NODE(start) ?
bool disconnected = false;
*outNodeBefore = nsContentUtils::ComparePoints(rangeStartParent,
rangeStartOffset,
parent, nodeStart,
&disconnected) > 0;
NS_ENSURE_TRUE(!disconnected, NS_ERROR_DOM_WRONG_DOCUMENT_ERR);
// is RANGE(end) >= NODE(end) ?
*outNodeAfter = nsContentUtils::ComparePoints(rangeEndParent,
rangeEndOffset,
parent, nodeEnd,
&disconnected) < 0;
NS_ENSURE_TRUE(!disconnected, NS_ERROR_DOM_WRONG_DOCUMENT_ERR);
return NS_OK;
}
static nsINode*
GetNextRangeCommonAncestor(nsINode* aNode)
{
while (aNode && !aNode->IsCommonAncestorForRangeInSelection()) {
if (!aNode->IsDescendantOfCommonAncestorForRangeInSelection()) {
return nullptr;
}
aNode = aNode->GetParentNode();
}
return aNode;
}
/**
* A Comparator suitable for mozilla::BinarySearchIf for searching a collection
* of nsRange* for an overlap of (mNode, mStartOffset) .. (mNode, mEndOffset).
*/
struct IsItemInRangeComparator
{
nsINode* mNode;
uint32_t mStartOffset;
uint32_t mEndOffset;
int operator()(const nsRange* const aRange) const
{
int32_t cmp = nsContentUtils::ComparePoints(mNode, mEndOffset,
aRange->GetStartParent(),
aRange->StartOffset());
if (cmp == 1) {
cmp = nsContentUtils::ComparePoints(mNode, mStartOffset,
aRange->GetEndParent(),
aRange->EndOffset());
if (cmp == -1) {
return 0;
}
return 1;
}
return -1;
}
};
/* static */ bool
nsRange::IsNodeSelected(nsINode* aNode, uint32_t aStartOffset,
uint32_t aEndOffset)
{
NS_PRECONDITION(aNode, "bad arg");
nsINode* n = GetNextRangeCommonAncestor(aNode);
NS_ASSERTION(n || !aNode->IsSelectionDescendant(),
"orphan selection descendant");
// Collect the potential ranges and their selection objects.
RangeHashTable ancestorSelectionRanges;
nsTHashtable<nsPtrHashKey<Selection>> ancestorSelections;
uint32_t maxRangeCount = 0;
for (; n; n = GetNextRangeCommonAncestor(n->GetParentNode())) {
RangeHashTable* ranges =
static_cast<RangeHashTable*>(n->GetProperty(nsGkAtoms::range));
for (auto iter = ranges->ConstIter(); !iter.Done(); iter.Next()) {
nsRange* range = iter.Get()->GetKey();
if (range->IsInSelection() && !range->Collapsed()) {
ancestorSelectionRanges.PutEntry(range);
Selection* selection = range->mSelection;
ancestorSelections.PutEntry(selection);
maxRangeCount = std::max(maxRangeCount, selection->RangeCount());
}
}
}
if (!ancestorSelectionRanges.IsEmpty()) {
nsTArray<const nsRange*> sortedRanges(maxRangeCount);
for (auto iter = ancestorSelections.ConstIter(); !iter.Done(); iter.Next()) {
Selection* selection = iter.Get()->GetKey();
// Sort the found ranges for |selection| in document order
// (Selection::GetRangeAt returns its ranges ordered).
for (uint32_t i = 0, len = selection->RangeCount(); i < len; ++i) {
nsRange* range = selection->GetRangeAt(i);
if (ancestorSelectionRanges.Contains(range)) {
sortedRanges.AppendElement(range);
}
}
MOZ_ASSERT(!sortedRanges.IsEmpty());
// Binary search the now sorted ranges.
IsItemInRangeComparator comparator = { aNode, aStartOffset, aEndOffset };
size_t unused;
if (mozilla::BinarySearchIf(sortedRanges, 0, sortedRanges.Length(), comparator, &unused)) {
return true;
}
sortedRanges.ClearAndRetainStorage();
}
}
return false;
}
/******************************************************
* constructor/destructor
******************************************************/
nsRange::~nsRange()
{
NS_ASSERTION(!IsInSelection(), "deleting nsRange that is in use");
// we want the side effects (releases and list removals)
DoSetRange(nullptr, 0, nullptr, 0, nullptr);
}
nsRange::nsRange(nsINode* aNode)
: mRoot(nullptr)
, mStartOffset(0)
, mEndOffset(0)
, mIsPositioned(false)
, mMaySpanAnonymousSubtrees(false)
, mIsGenerated(false)
, mStartOffsetWasIncremented(false)
, mEndOffsetWasIncremented(false)
, mEnableGravitationOnElementRemoval(true)
#ifdef DEBUG
, mAssertNextInsertOrAppendIndex(-1)
, mAssertNextInsertOrAppendNode(nullptr)
#endif
{
MOZ_ASSERT(aNode, "range isn't in a document!");
mOwner = aNode->OwnerDoc();
}
/* static */
nsresult
nsRange::CreateRange(nsINode* aStartParent, int32_t aStartOffset,
nsINode* aEndParent, int32_t aEndOffset,
nsRange** aRange)
{
nsCOMPtr<nsIDOMNode> startDomNode = do_QueryInterface(aStartParent);
nsCOMPtr<nsIDOMNode> endDomNode = do_QueryInterface(aEndParent);
nsresult rv = CreateRange(startDomNode, aStartOffset, endDomNode, aEndOffset,
aRange);
return rv;
}
/* static */
nsresult
nsRange::CreateRange(nsIDOMNode* aStartParent, int32_t aStartOffset,
nsIDOMNode* aEndParent, int32_t aEndOffset,
nsRange** aRange)
{
MOZ_ASSERT(aRange);
*aRange = nullptr;
nsCOMPtr<nsINode> startParent = do_QueryInterface(aStartParent);
NS_ENSURE_ARG_POINTER(startParent);
RefPtr<nsRange> range = new nsRange(startParent);
nsresult rv = range->SetStart(startParent, aStartOffset);
NS_ENSURE_SUCCESS(rv, rv);
rv = range->SetEnd(aEndParent, aEndOffset);
NS_ENSURE_SUCCESS(rv, rv);
range.forget(aRange);
return NS_OK;
}
/* static */
nsresult
nsRange::CreateRange(nsIDOMNode* aStartParent, int32_t aStartOffset,
nsIDOMNode* aEndParent, int32_t aEndOffset,
nsIDOMRange** aRange)
{
RefPtr<nsRange> range;
nsresult rv = nsRange::CreateRange(aStartParent, aStartOffset, aEndParent,
aEndOffset, getter_AddRefs(range));
range.forget(aRange);
return rv;
}
/******************************************************
* nsISupports
******************************************************/
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsRange)
NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(nsRange,
DoSetRange(nullptr, 0, nullptr, 0, nullptr))
// QueryInterface implementation for nsRange
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsRange)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsIDOMRange)
NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMRange)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION_CLASS(nsRange)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsRange)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner);
tmp->Reset();
// This needs to be unlinked after Reset() is called, as it controls
// the result of IsInSelection() which is used by tmp->Reset().
NS_IMPL_CYCLE_COLLECTION_UNLINK(mSelection);
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsRange)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mStartParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEndParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mSelection)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_SCRIPT_OBJECTS
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(nsRange)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
static void MarkDescendants(nsINode* aNode)
{
// Set NodeIsDescendantOfCommonAncestorForRangeInSelection on aNode's
// descendants unless aNode is already marked as a range common ancestor
// or a descendant of one, in which case all of our descendants have the
// bit set already.
if (!aNode->IsSelectionDescendant()) {
// don't set the Descendant bit on |aNode| itself
nsINode* node = aNode->GetNextNode(aNode);
while (node) {
node->SetDescendantOfCommonAncestorForRangeInSelection();
if (!node->IsCommonAncestorForRangeInSelection()) {
node = node->GetNextNode(aNode);
} else {
// optimize: skip this sub-tree since it's marked already.
node = node->GetNextNonChildNode(aNode);
}
}
}
}
static void UnmarkDescendants(nsINode* aNode)
{
// Unset NodeIsDescendantOfCommonAncestorForRangeInSelection on aNode's
// descendants unless aNode is a descendant of another range common ancestor.
// Also, exclude descendants of range common ancestors (but not the common
// ancestor itself).
if (!aNode->IsDescendantOfCommonAncestorForRangeInSelection()) {
// we know |aNode| doesn't have any bit set
nsINode* node = aNode->GetNextNode(aNode);
while (node) {
node->ClearDescendantOfCommonAncestorForRangeInSelection();
if (!node->IsCommonAncestorForRangeInSelection()) {
node = node->GetNextNode(aNode);
} else {
// We found an ancestor of an overlapping range, skip its descendants.
node = node->GetNextNonChildNode(aNode);
}
}
}
}
void
nsRange::RegisterCommonAncestor(nsINode* aNode)
{
NS_PRECONDITION(aNode, "bad arg");
NS_ASSERTION(IsInSelection(), "registering range not in selection");
MarkDescendants(aNode);
RangeHashTable* ranges =
static_cast<RangeHashTable*>(aNode->GetProperty(nsGkAtoms::range));
if (!ranges) {
ranges = new RangeHashTable;
aNode->SetProperty(nsGkAtoms::range, ranges,
nsINode::DeleteProperty<nsRange::RangeHashTable>, true);
}
ranges->PutEntry(this);
aNode->SetCommonAncestorForRangeInSelection();
}
void
nsRange::UnregisterCommonAncestor(nsINode* aNode)
{
NS_PRECONDITION(aNode, "bad arg");
NS_ASSERTION(aNode->IsCommonAncestorForRangeInSelection(), "wrong node");
RangeHashTable* ranges =
static_cast<RangeHashTable*>(aNode->GetProperty(nsGkAtoms::range));
NS_ASSERTION(ranges->GetEntry(this), "unknown range");
if (ranges->Count() == 1) {
aNode->ClearCommonAncestorForRangeInSelection();
aNode->DeleteProperty(nsGkAtoms::range);
UnmarkDescendants(aNode);
} else {
ranges->RemoveEntry(this);
}
}
/******************************************************
* nsIMutationObserver implementation
******************************************************/
void
nsRange::CharacterDataChanged(nsIDocument* aDocument,
nsIContent* aContent,
CharacterDataChangeInfo* aInfo)
{
MOZ_ASSERT(mAssertNextInsertOrAppendIndex == -1,
"splitText failed to notify insert/append?");
NS_ASSERTION(mIsPositioned, "shouldn't be notified if not positioned");
nsINode* newRoot = nullptr;
nsINode* newStartNode = nullptr;
nsINode* newEndNode = nullptr;
uint32_t newStartOffset = 0;
uint32_t newEndOffset = 0;
if (aInfo->mDetails &&
aInfo->mDetails->mType == CharacterDataChangeInfo::Details::eSplit) {
// If the splitted text node is immediately before a range boundary point
// that refers to a child index (i.e. its parent is the boundary container)
// then we need to increment the corresponding offset to account for the new
// text node that will be inserted. If so, we need to prevent the next
// ContentInserted or ContentAppended for this range from incrementing it
// again (when the new text node is notified).
nsINode* parentNode = aContent->GetParentNode();
int32_t index = -1;
if (parentNode == mEndParent && mEndOffset > 0 &&
(index = parentNode->IndexOf(aContent)) + 1 == mEndOffset) {
++mEndOffset;
mEndOffsetWasIncremented = true;
}
if (parentNode == mStartParent && mStartOffset > 0 &&
(index != -1 ? index : parentNode->IndexOf(aContent)) + 1 == mStartOffset) {
++mStartOffset;
mStartOffsetWasIncremented = true;
}
#ifdef DEBUG
if (mStartOffsetWasIncremented || mEndOffsetWasIncremented) {
mAssertNextInsertOrAppendIndex =
(mStartOffsetWasIncremented ? mStartOffset : mEndOffset) - 1;
mAssertNextInsertOrAppendNode = aInfo->mDetails->mNextSibling;
}
#endif
}
// If the changed node contains our start boundary and the change starts
// before the boundary we'll need to adjust the offset.
if (aContent == mStartParent &&
aInfo->mChangeStart < static_cast<uint32_t>(mStartOffset)) {
if (aInfo->mDetails) {
// splitText(), aInfo->mDetails->mNextSibling is the new text node
NS_ASSERTION(aInfo->mDetails->mType ==
CharacterDataChangeInfo::Details::eSplit,
"only a split can start before the end");
NS_ASSERTION(static_cast<uint32_t>(mStartOffset) <= aInfo->mChangeEnd + 1,
"mStartOffset is beyond the end of this node");
newStartOffset = static_cast<uint32_t>(mStartOffset) - aInfo->mChangeStart;
newStartNode = aInfo->mDetails->mNextSibling;
if (MOZ_UNLIKELY(aContent == mRoot)) {
newRoot = IsValidBoundary(newStartNode);
}
bool isCommonAncestor = IsInSelection() && mStartParent == mEndParent;
if (isCommonAncestor) {
UnregisterCommonAncestor(mStartParent);
RegisterCommonAncestor(newStartNode);
}
if (mStartParent->IsDescendantOfCommonAncestorForRangeInSelection()) {
newStartNode->SetDescendantOfCommonAncestorForRangeInSelection();
}
} else {
// If boundary is inside changed text, position it before change
// else adjust start offset for the change in length.
mStartOffset = static_cast<uint32_t>(mStartOffset) <= aInfo->mChangeEnd ?
aInfo->mChangeStart :
mStartOffset + aInfo->mChangeStart - aInfo->mChangeEnd +
aInfo->mReplaceLength;
}
}
// Do the same thing for the end boundary, except for splitText of a node
// with no parent then only switch to the new node if the start boundary
// did so too (otherwise the range would end up with disconnected nodes).
if (aContent == mEndParent &&
aInfo->mChangeStart < static_cast<uint32_t>(mEndOffset)) {
if (aInfo->mDetails && (aContent->GetParentNode() || newStartNode)) {
// splitText(), aInfo->mDetails->mNextSibling is the new text node
NS_ASSERTION(aInfo->mDetails->mType ==
CharacterDataChangeInfo::Details::eSplit,
"only a split can start before the end");
NS_ASSERTION(static_cast<uint32_t>(mEndOffset) <= aInfo->mChangeEnd + 1,
"mEndOffset is beyond the end of this node");
newEndOffset = static_cast<uint32_t>(mEndOffset) - aInfo->mChangeStart;
newEndNode = aInfo->mDetails->mNextSibling;
bool isCommonAncestor = IsInSelection() && mStartParent == mEndParent;
if (isCommonAncestor && !newStartNode) {
// The split occurs inside the range.
UnregisterCommonAncestor(mStartParent);
RegisterCommonAncestor(mStartParent->GetParentNode());
newEndNode->SetDescendantOfCommonAncestorForRangeInSelection();
} else if (mEndParent->IsDescendantOfCommonAncestorForRangeInSelection()) {
newEndNode->SetDescendantOfCommonAncestorForRangeInSelection();
}
} else {
mEndOffset = static_cast<uint32_t>(mEndOffset) <= aInfo->mChangeEnd ?
aInfo->mChangeStart :
mEndOffset + aInfo->mChangeStart - aInfo->mChangeEnd +
aInfo->mReplaceLength;
}
}
if (aInfo->mDetails &&
aInfo->mDetails->mType == CharacterDataChangeInfo::Details::eMerge) {
// normalize(), aInfo->mDetails->mNextSibling is the merged text node
// that will be removed
nsIContent* removed = aInfo->mDetails->mNextSibling;
if (removed == mStartParent) {
newStartOffset = static_cast<uint32_t>(mStartOffset) + aInfo->mChangeStart;
newStartNode = aContent;
if (MOZ_UNLIKELY(removed == mRoot)) {
newRoot = IsValidBoundary(newStartNode);
}
}
if (removed == mEndParent) {
newEndOffset = static_cast<uint32_t>(mEndOffset) + aInfo->mChangeStart;
newEndNode = aContent;
if (MOZ_UNLIKELY(removed == mRoot)) {
newRoot = IsValidBoundary(newEndNode);
}
}
// When the removed text node's parent is one of our boundary nodes we may
// need to adjust the offset to account for the removed node. However,
// there will also be a ContentRemoved notification later so the only cases
// we need to handle here is when the removed node is the text node after
// the boundary. (The m*Offset > 0 check is an optimization - a boundary
// point before the first child is never affected by normalize().)
nsINode* parentNode = aContent->GetParentNode();
if (parentNode == mStartParent && mStartOffset > 0 &&
uint32_t(mStartOffset) < parentNode->GetChildCount() &&
removed == parentNode->GetChildAt(mStartOffset)) {
newStartNode = aContent;
newStartOffset = aInfo->mChangeStart;
}
if (parentNode == mEndParent && mEndOffset > 0 &&
uint32_t(mEndOffset) < parentNode->GetChildCount() &&
removed == parentNode->GetChildAt(mEndOffset)) {
newEndNode = aContent;
newEndOffset = aInfo->mChangeEnd;
}
}
if (newStartNode || newEndNode) {
if (!newStartNode) {
newStartNode = mStartParent;
newStartOffset = mStartOffset;
}
if (!newEndNode) {
newEndNode = mEndParent;
newEndOffset = mEndOffset;
}
DoSetRange(newStartNode, newStartOffset, newEndNode, newEndOffset,
newRoot ? newRoot : mRoot.get(),
!newEndNode->GetParentNode() || !newStartNode->GetParentNode());
}
}
void
nsRange::ContentAppended(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aFirstNewContent,
int32_t aNewIndexInContainer)
{
NS_ASSERTION(mIsPositioned, "shouldn't be notified if not positioned");
nsINode* container = NODE_FROM(aContainer, aDocument);
if (container->IsSelectionDescendant() && IsInSelection()) {
nsINode* child = aFirstNewContent;
while (child) {
if (!child->IsDescendantOfCommonAncestorForRangeInSelection()) {
MarkDescendants(child);
child->SetDescendantOfCommonAncestorForRangeInSelection();
}
child = child->GetNextSibling();
}
}
if (mStartOffsetWasIncremented || mEndOffsetWasIncremented) {
MOZ_ASSERT(mAssertNextInsertOrAppendIndex == aNewIndexInContainer);
MOZ_ASSERT(mAssertNextInsertOrAppendNode == aFirstNewContent);
MOZ_ASSERT(aFirstNewContent->IsNodeOfType(nsINode::eDATA_NODE));
mStartOffsetWasIncremented = mEndOffsetWasIncremented = false;
#ifdef DEBUG
mAssertNextInsertOrAppendIndex = -1;
mAssertNextInsertOrAppendNode = nullptr;
#endif
}
}
void
nsRange::ContentInserted(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer)
{
NS_ASSERTION(mIsPositioned, "shouldn't be notified if not positioned");
nsINode* container = NODE_FROM(aContainer, aDocument);
// Adjust position if a sibling was inserted.
if (container == mStartParent && aIndexInContainer < mStartOffset &&
!mStartOffsetWasIncremented) {
++mStartOffset;
}
if (container == mEndParent && aIndexInContainer < mEndOffset &&
!mEndOffsetWasIncremented) {
++mEndOffset;
}
if (container->IsSelectionDescendant() &&
!aChild->IsDescendantOfCommonAncestorForRangeInSelection()) {
MarkDescendants(aChild);
aChild->SetDescendantOfCommonAncestorForRangeInSelection();
}
if (mStartOffsetWasIncremented || mEndOffsetWasIncremented) {
MOZ_ASSERT(mAssertNextInsertOrAppendIndex == aIndexInContainer);
MOZ_ASSERT(mAssertNextInsertOrAppendNode == aChild);
MOZ_ASSERT(aChild->IsNodeOfType(nsINode::eDATA_NODE));
mStartOffsetWasIncremented = mEndOffsetWasIncremented = false;
#ifdef DEBUG
mAssertNextInsertOrAppendIndex = -1;
mAssertNextInsertOrAppendNode = nullptr;
#endif
}
}
void
nsRange::ContentRemoved(nsIDocument* aDocument,
nsIContent* aContainer,
nsIContent* aChild,
int32_t aIndexInContainer,
nsIContent* aPreviousSibling)
{
NS_ASSERTION(mIsPositioned, "shouldn't be notified if not positioned");
MOZ_ASSERT(!mStartOffsetWasIncremented && !mEndOffsetWasIncremented &&
mAssertNextInsertOrAppendIndex == -1,
"splitText failed to notify insert/append?");
nsINode* container = NODE_FROM(aContainer, aDocument);
bool gravitateStart = false;
bool gravitateEnd = false;
bool didCheckStartParentDescendant = false;
// Adjust position if a sibling was removed...
if (container == mStartParent) {
if (aIndexInContainer < mStartOffset) {
--mStartOffset;
}
} else { // ...or gravitate if an ancestor was removed.
didCheckStartParentDescendant = true;
gravitateStart = nsContentUtils::ContentIsDescendantOf(mStartParent, aChild);
}
// Do same thing for end boundry.
if (container == mEndParent) {
if (aIndexInContainer < mEndOffset) {
--mEndOffset;
}
} else if (didCheckStartParentDescendant && mStartParent == mEndParent) {
gravitateEnd = gravitateStart;
} else {
gravitateEnd = nsContentUtils::ContentIsDescendantOf(mEndParent, aChild);
}
if (!mEnableGravitationOnElementRemoval) {
// Do not gravitate.
return;
}
if (gravitateStart || gravitateEnd) {
DoSetRange(gravitateStart ? container : mStartParent.get(),
gravitateStart ? aIndexInContainer : mStartOffset,
gravitateEnd ? container : mEndParent.get(),
gravitateEnd ? aIndexInContainer : mEndOffset,
mRoot);
}
if (container->IsSelectionDescendant() &&
aChild->IsDescendantOfCommonAncestorForRangeInSelection()) {
aChild->ClearDescendantOfCommonAncestorForRangeInSelection();
UnmarkDescendants(aChild);
}
}
void
nsRange::ParentChainChanged(nsIContent *aContent)
{
MOZ_ASSERT(!mStartOffsetWasIncremented && !mEndOffsetWasIncremented &&
mAssertNextInsertOrAppendIndex == -1,
"splitText failed to notify insert/append?");
NS_ASSERTION(mRoot == aContent, "Wrong ParentChainChanged notification?");
nsINode* newRoot = IsValidBoundary(mStartParent);
NS_ASSERTION(newRoot, "No valid boundary or root found!");
if (newRoot != IsValidBoundary(mEndParent)) {
// Sometimes ordering involved in cycle collection can lead to our
// start parent and/or end parent being disconnected from our root
// without our getting a ContentRemoved notification.
// See bug 846096 for more details.
NS_ASSERTION(mEndParent->IsInNativeAnonymousSubtree(),
"This special case should happen only with "
"native-anonymous content");
// When that happens, bail out and set pointers to null; since we're
// in cycle collection and unreachable it shouldn't matter.
Reset();
return;
}
// This is safe without holding a strong ref to self as long as the change
// of mRoot is the last thing in DoSetRange.
DoSetRange(mStartParent, mStartOffset, mEndParent, mEndOffset, newRoot);
}
/******************************************************
* Utilities for comparing points: API from nsIDOMRange
******************************************************/
NS_IMETHODIMP
nsRange::IsPointInRange(nsIDOMNode* aParent, int32_t aOffset, bool* aResult)
{
nsCOMPtr<nsINode> parent = do_QueryInterface(aParent);
if (!parent) {
return NS_ERROR_DOM_NOT_OBJECT_ERR;
}
ErrorResult rv;
*aResult = IsPointInRange(*parent, aOffset, rv);
return rv.StealNSResult();
}
bool
nsRange::IsPointInRange(nsINode& aParent, uint32_t aOffset, ErrorResult& aRv)
{
uint16_t compareResult = ComparePoint(aParent, aOffset, aRv);
// If the node isn't in the range's document, it clearly isn't in the range.
if (aRv.ErrorCodeIs(NS_ERROR_DOM_WRONG_DOCUMENT_ERR)) {
aRv.SuppressException();
return false;
}
return compareResult == 0;
}
// returns -1 if point is before range, 0 if point is in range,
// 1 if point is after range.
NS_IMETHODIMP
nsRange::ComparePoint(nsIDOMNode* aParent, int32_t aOffset, int16_t* aResult)
{
nsCOMPtr<nsINode> parent = do_QueryInterface(aParent);
NS_ENSURE_TRUE(parent, NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
ErrorResult rv;
*aResult = ComparePoint(*parent, aOffset, rv);
return rv.StealNSResult();
}
int16_t
nsRange::ComparePoint(nsINode& aParent, uint32_t aOffset, ErrorResult& aRv)
{
// our range is in a good state?
if (!mIsPositioned) {
aRv.Throw(NS_ERROR_NOT_INITIALIZED);
return 0;
}
if (!nsContentUtils::ContentIsDescendantOf(&aParent, mRoot)) {
aRv.Throw(NS_ERROR_DOM_WRONG_DOCUMENT_ERR);
return 0;
}
if (aParent.NodeType() == nsIDOMNode::DOCUMENT_TYPE_NODE) {
aRv.Throw(NS_ERROR_DOM_INVALID_NODE_TYPE_ERR);
return 0;
}
if (aOffset > aParent.Length()) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return 0;
}
int32_t cmp;
if ((cmp = nsContentUtils::ComparePoints(&aParent, aOffset,
mStartParent, mStartOffset)) <= 0) {
return cmp;
}
if (nsContentUtils::ComparePoints(mEndParent, mEndOffset,
&aParent, aOffset) == -1) {
return 1;
}
return 0;
}
NS_IMETHODIMP
nsRange::IntersectsNode(nsIDOMNode* aNode, bool* aResult)
{
*aResult = false;
nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
// TODO: This should throw a TypeError.
NS_ENSURE_ARG(node);
ErrorResult rv;
*aResult = IntersectsNode(*node, rv);
return rv.StealNSResult();
}
bool
nsRange::IntersectsNode(nsINode& aNode, ErrorResult& aRv)
{
if (!mIsPositioned) {
aRv.Throw(NS_ERROR_NOT_INITIALIZED);
return false;
}
// Step 3.
nsINode* parent = aNode.GetParentNode();
if (!parent) {
// Steps 2 and 4.
// |parent| is null, so |node|'s root is |node| itself.
return GetRoot() == &aNode;
}
// Step 5.
int32_t nodeIndex = parent->IndexOf(&aNode);
// Steps 6-7.
// Note: if disconnected is true, ComparePoints returns 1.
bool disconnected = false;
bool result = nsContentUtils::ComparePoints(mStartParent, mStartOffset,
parent, nodeIndex + 1,
&disconnected) < 0 &&
nsContentUtils::ComparePoints(parent, nodeIndex,
mEndParent, mEndOffset,
&disconnected) < 0;
// Step 2.
if (disconnected) {
result = false;
}
return result;
}
/******************************************************
* Private helper routines
******************************************************/
// It's important that all setting of the range start/end points
// go through this function, which will do all the right voodoo
// for content notification of range ownership.
// Calling DoSetRange with either parent argument null will collapse
// the range to have both endpoints point to the other node
void
nsRange::DoSetRange(nsINode* aStartN, int32_t aStartOffset,
nsINode* aEndN, int32_t aEndOffset,
nsINode* aRoot, bool aNotInsertedYet)
{
NS_PRECONDITION((aStartN && aEndN && aRoot) ||
(!aStartN && !aEndN && !aRoot),
"Set all or none");
NS_PRECONDITION(!aRoot || aNotInsertedYet ||
(nsContentUtils::ContentIsDescendantOf(aStartN, aRoot) &&
nsContentUtils::ContentIsDescendantOf(aEndN, aRoot) &&
aRoot == IsValidBoundary(aStartN) &&
aRoot == IsValidBoundary(aEndN)),
"Wrong root");
NS_PRECONDITION(!aRoot ||
(aStartN->IsNodeOfType(nsINode::eCONTENT) &&
aEndN->IsNodeOfType(nsINode::eCONTENT) &&
aRoot ==
static_cast<nsIContent*>(aStartN)->GetBindingParent() &&
aRoot ==
static_cast<nsIContent*>(aEndN)->GetBindingParent()) ||
(!aRoot->GetParentNode() &&
(aRoot->IsNodeOfType(nsINode::eDOCUMENT) ||
aRoot->IsNodeOfType(nsINode::eATTRIBUTE) ||
aRoot->IsNodeOfType(nsINode::eDOCUMENT_FRAGMENT) ||
/*For backward compatibility*/
aRoot->IsNodeOfType(nsINode::eCONTENT))),
"Bad root");
if (mRoot != aRoot) {
if (mRoot) {
mRoot->RemoveMutationObserver(this);
}
if (aRoot) {
aRoot->AddMutationObserver(this);
}
}
bool checkCommonAncestor = (mStartParent != aStartN || mEndParent != aEndN) &&
IsInSelection() && !aNotInsertedYet;
nsINode* oldCommonAncestor = checkCommonAncestor ? GetCommonAncestor() : nullptr;
mStartParent = aStartN;
mStartOffset = aStartOffset;
mEndParent = aEndN;
mEndOffset = aEndOffset;
mIsPositioned = !!mStartParent;
if (checkCommonAncestor) {
nsINode* newCommonAncestor = GetCommonAncestor();
if (newCommonAncestor != oldCommonAncestor) {
if (oldCommonAncestor) {
UnregisterCommonAncestor(oldCommonAncestor);
}
if (newCommonAncestor) {
RegisterCommonAncestor(newCommonAncestor);
} else {
NS_ASSERTION(!mIsPositioned, "unexpected disconnected nodes");
mSelection = nullptr;
}
}
}
// This needs to be the last thing this function does, other than notifying
// selection listeners. See comment in ParentChainChanged.
mRoot = aRoot;
// Notify any selection listeners. This has to occur last because otherwise the world
// could be observed by a selection listener while the range was in an invalid state.
if (mSelection) {
mSelection->NotifySelectionListeners();
}
}
static int32_t
IndexOf(nsINode* aChild)
{
nsINode* parent = aChild->GetParentNode();
return parent ? parent->IndexOf(aChild) : -1;
}
void
nsRange::SetSelection(mozilla::dom::Selection* aSelection)
{
if (mSelection == aSelection) {
return;
}
// At least one of aSelection and mSelection must be null
// aSelection will be null when we are removing from a selection
// and a range can't be in more than one selection at a time,
// thus mSelection must be null too.
MOZ_ASSERT(!aSelection || !mSelection);
mSelection = aSelection;
nsINode* commonAncestor = GetCommonAncestor();
NS_ASSERTION(commonAncestor, "unexpected disconnected nodes");
if (mSelection) {
RegisterCommonAncestor(commonAncestor);
} else {
UnregisterCommonAncestor(commonAncestor);
}
}
nsINode*
nsRange::GetCommonAncestor() const
{
return mIsPositioned ?
nsContentUtils::GetCommonAncestor(mStartParent, mEndParent) :
nullptr;
}
void
nsRange::Reset()
{
DoSetRange(nullptr, 0, nullptr, 0, nullptr);
}
/******************************************************
* public functionality
******************************************************/
NS_IMETHODIMP
nsRange::GetStartContainer(nsIDOMNode** aStartParent)
{
if (!mIsPositioned)
return NS_ERROR_NOT_INITIALIZED;
return CallQueryInterface(mStartParent, aStartParent);
}
nsINode*
nsRange::GetStartContainer(ErrorResult& aRv) const
{
if (!mIsPositioned) {
aRv.Throw(NS_ERROR_NOT_INITIALIZED);
return nullptr;
}
return mStartParent;
}
NS_IMETHODIMP
nsRange::GetStartOffset(int32_t* aStartOffset)
{
if (!mIsPositioned)
return NS_ERROR_NOT_INITIALIZED;
*aStartOffset = mStartOffset;
return NS_OK;
}
uint32_t
nsRange::GetStartOffset(ErrorResult& aRv) const
{
if (!mIsPositioned) {
aRv.Throw(NS_ERROR_NOT_INITIALIZED);
return 0;
}
return mStartOffset;
}
NS_IMETHODIMP
nsRange::GetEndContainer(nsIDOMNode** aEndParent)
{
if (!mIsPositioned)
return NS_ERROR_NOT_INITIALIZED;
return CallQueryInterface(mEndParent, aEndParent);
}
nsINode*
nsRange::GetEndContainer(ErrorResult& aRv) const
{
if (!mIsPositioned) {
aRv.Throw(NS_ERROR_NOT_INITIALIZED);
return nullptr;
}
return mEndParent;
}
NS_IMETHODIMP
nsRange::GetEndOffset(int32_t* aEndOffset)
{
if (!mIsPositioned)
return NS_ERROR_NOT_INITIALIZED;
*aEndOffset = mEndOffset;
return NS_OK;
}
uint32_t
nsRange::GetEndOffset(ErrorResult& aRv) const
{
if (!mIsPositioned) {
aRv.Throw(NS_ERROR_NOT_INITIALIZED);
return 0;
}
return mEndOffset;
}
NS_IMETHODIMP
nsRange::GetCollapsed(bool* aIsCollapsed)
{
if (!mIsPositioned)
return NS_ERROR_NOT_INITIALIZED;
*aIsCollapsed = Collapsed();
return NS_OK;
}
nsINode*
nsRange::GetCommonAncestorContainer(ErrorResult& aRv) const
{
if (!mIsPositioned) {
aRv.Throw(NS_ERROR_NOT_INITIALIZED);
return nullptr;
}
return nsContentUtils::GetCommonAncestor(mStartParent, mEndParent);
}
NS_IMETHODIMP
nsRange::GetCommonAncestorContainer(nsIDOMNode** aCommonParent)
{
ErrorResult rv;
nsINode* commonAncestor = GetCommonAncestorContainer(rv);
if (commonAncestor) {
NS_ADDREF(*aCommonParent = commonAncestor->AsDOMNode());
} else {
*aCommonParent = nullptr;
}
return rv.StealNSResult();
}
nsINode*
nsRange::IsValidBoundary(nsINode* aNode)
{
if (!aNode) {
return nullptr;
}
if (aNode->IsNodeOfType(nsINode::eCONTENT)) {
if (aNode->NodeInfo()->NameAtom() == nsGkAtoms::documentTypeNodeName) {
return nullptr;
}
nsIContent* content = static_cast<nsIContent*>(aNode);
if (!mMaySpanAnonymousSubtrees) {
// If the node is in a shadow tree then the ShadowRoot is the root.
ShadowRoot* containingShadow = content->GetContainingShadow();
if (containingShadow) {
return containingShadow;
}
// If the node has a binding parent, that should be the root.
// XXXbz maybe only for native anonymous content?
nsINode* root = content->GetBindingParent();
if (root) {
return root;
}
}
}
// Elements etc. must be in document or in document fragment,
// text nodes in document, in document fragment or in attribute.
nsINode* root = aNode->GetUncomposedDoc();
if (root) {
return root;
}
root = aNode->SubtreeRoot();
NS_ASSERTION(!root->IsNodeOfType(nsINode::eDOCUMENT),
"GetUncomposedDoc should have returned a doc");
// We allow this because of backward compatibility.
return root;
}
void
nsRange::SetStart(nsINode& aNode, uint32_t aOffset, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
AutoInvalidateSelection atEndOfBlock(this);
aRv = SetStart(&aNode, aOffset);
}
NS_IMETHODIMP
nsRange::SetStart(nsIDOMNode* aParent, int32_t aOffset)
{
nsCOMPtr<nsINode> parent = do_QueryInterface(aParent);
if (!parent) {
return NS_ERROR_DOM_NOT_OBJECT_ERR;
}
ErrorResult rv;
SetStart(*parent, aOffset, rv);
return rv.StealNSResult();
}
/* virtual */ nsresult
nsRange::SetStart(nsINode* aParent, int32_t aOffset)
{
nsINode* newRoot = IsValidBoundary(aParent);
if (!newRoot) {
return NS_ERROR_DOM_INVALID_NODE_TYPE_ERR;
}
if (aOffset < 0 || uint32_t(aOffset) > aParent->Length()) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
// Collapse if not positioned yet, if positioned in another doc or
// if the new start is after end.
if (!mIsPositioned || newRoot != mRoot ||
nsContentUtils::ComparePoints(aParent, aOffset,
mEndParent, mEndOffset) == 1) {
DoSetRange(aParent, aOffset, aParent, aOffset, newRoot);
return NS_OK;
}
DoSetRange(aParent, aOffset, mEndParent, mEndOffset, mRoot);
return NS_OK;
}
void
nsRange::SetStartBefore(nsINode& aNode, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
AutoInvalidateSelection atEndOfBlock(this);
aRv = SetStart(aNode.GetParentNode(), IndexOf(&aNode));
}
NS_IMETHODIMP
nsRange::SetStartBefore(nsIDOMNode* aSibling)
{
nsCOMPtr<nsINode> sibling = do_QueryInterface(aSibling);
if (!sibling) {
return NS_ERROR_DOM_NOT_OBJECT_ERR;
}
ErrorResult rv;
SetStartBefore(*sibling, rv);
return rv.StealNSResult();
}
void
nsRange::SetStartAfter(nsINode& aNode, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
AutoInvalidateSelection atEndOfBlock(this);
aRv = SetStart(aNode.GetParentNode(), IndexOf(&aNode) + 1);
}
NS_IMETHODIMP
nsRange::SetStartAfter(nsIDOMNode* aSibling)
{
nsCOMPtr<nsINode> sibling = do_QueryInterface(aSibling);
if (!sibling) {
return NS_ERROR_DOM_NOT_OBJECT_ERR;
}
ErrorResult rv;
SetStartAfter(*sibling, rv);
return rv.StealNSResult();
}
void
nsRange::SetEnd(nsINode& aNode, uint32_t aOffset, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
AutoInvalidateSelection atEndOfBlock(this);
aRv = SetEnd(&aNode, aOffset);
}
NS_IMETHODIMP
nsRange::SetEnd(nsIDOMNode* aParent, int32_t aOffset)
{
nsCOMPtr<nsINode> parent = do_QueryInterface(aParent);
if (!parent) {
return NS_ERROR_DOM_NOT_OBJECT_ERR;
}
ErrorResult rv;
SetEnd(*parent, aOffset, rv);
return rv.StealNSResult();
}
/* virtual */ nsresult
nsRange::SetEnd(nsINode* aParent, int32_t aOffset)
{
nsINode* newRoot = IsValidBoundary(aParent);
if (!newRoot) {
return NS_ERROR_DOM_INVALID_NODE_TYPE_ERR;
}
if (aOffset < 0 || uint32_t(aOffset) > aParent->Length()) {
return NS_ERROR_DOM_INDEX_SIZE_ERR;
}
// Collapse if not positioned yet, if positioned in another doc or
// if the new end is before start.
if (!mIsPositioned || newRoot != mRoot ||
nsContentUtils::ComparePoints(mStartParent, mStartOffset,
aParent, aOffset) == 1) {
DoSetRange(aParent, aOffset, aParent, aOffset, newRoot);
return NS_OK;
}
DoSetRange(mStartParent, mStartOffset, aParent, aOffset, mRoot);
return NS_OK;
}
void
nsRange::SetEndBefore(nsINode& aNode, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
AutoInvalidateSelection atEndOfBlock(this);
aRv = SetEnd(aNode.GetParentNode(), IndexOf(&aNode));
}
NS_IMETHODIMP
nsRange::SetEndBefore(nsIDOMNode* aSibling)
{
nsCOMPtr<nsINode> sibling = do_QueryInterface(aSibling);
if (!sibling) {
return NS_ERROR_DOM_NOT_OBJECT_ERR;
}
ErrorResult rv;
SetEndBefore(*sibling, rv);
return rv.StealNSResult();
}
void
nsRange::SetEndAfter(nsINode& aNode, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
AutoInvalidateSelection atEndOfBlock(this);
aRv = SetEnd(aNode.GetParentNode(), IndexOf(&aNode) + 1);
}
NS_IMETHODIMP
nsRange::SetEndAfter(nsIDOMNode* aSibling)
{
nsCOMPtr<nsINode> sibling = do_QueryInterface(aSibling);
if (!sibling) {
return NS_ERROR_DOM_NOT_OBJECT_ERR;
}
ErrorResult rv;
SetEndAfter(*sibling, rv);
return rv.StealNSResult();
}
NS_IMETHODIMP
nsRange::Collapse(bool aToStart)
{
if (!mIsPositioned)
return NS_ERROR_NOT_INITIALIZED;
AutoInvalidateSelection atEndOfBlock(this);
if (aToStart)
DoSetRange(mStartParent, mStartOffset, mStartParent, mStartOffset, mRoot);
else
DoSetRange(mEndParent, mEndOffset, mEndParent, mEndOffset, mRoot);
return NS_OK;
}
NS_IMETHODIMP
nsRange::SelectNode(nsIDOMNode* aN)
{
nsCOMPtr<nsINode> node = do_QueryInterface(aN);
NS_ENSURE_TRUE(node, NS_ERROR_DOM_INVALID_NODE_TYPE_ERR);
ErrorResult rv;
SelectNode(*node, rv);
return rv.StealNSResult();
}
void
nsRange::SelectNode(nsINode& aNode, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
nsINode* parent = aNode.GetParentNode();
nsINode* newRoot = IsValidBoundary(parent);
if (!newRoot) {
aRv.Throw(NS_ERROR_DOM_INVALID_NODE_TYPE_ERR);
return;
}
int32_t index = parent->IndexOf(&aNode);
if (index < 0) {
aRv.Throw(NS_ERROR_DOM_INVALID_NODE_TYPE_ERR);
return;
}
AutoInvalidateSelection atEndOfBlock(this);
DoSetRange(parent, index, parent, index + 1, newRoot);
}
NS_IMETHODIMP
nsRange::SelectNodeContents(nsIDOMNode* aN)
{
nsCOMPtr<nsINode> node = do_QueryInterface(aN);
NS_ENSURE_TRUE(node, NS_ERROR_DOM_INVALID_NODE_TYPE_ERR);
ErrorResult rv;
SelectNodeContents(*node, rv);
return rv.StealNSResult();
}
void
nsRange::SelectNodeContents(nsINode& aNode, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
nsINode* newRoot = IsValidBoundary(&aNode);
if (!newRoot) {
aRv.Throw(NS_ERROR_DOM_INVALID_NODE_TYPE_ERR);
return;
}
AutoInvalidateSelection atEndOfBlock(this);
DoSetRange(&aNode, 0, &aNode, aNode.Length(), newRoot);
}
// The Subtree Content Iterator only returns subtrees that are
// completely within a given range. It doesn't return a CharacterData
// node that contains either the start or end point of the range.,
// nor does it return element nodes when nothing in the element is selected.
// We need an iterator that will also include these start/end points
// so that our methods/algorithms aren't cluttered with special
// case code that tries to include these points while iterating.
//
// The RangeSubtreeIterator class mimics the nsIContentIterator
// methods we need, so should the Content Iterator support the
// start/end points in the future, we can switchover relatively
// easy.
class MOZ_STACK_CLASS RangeSubtreeIterator
{
private:
enum RangeSubtreeIterState { eDone=0,
eUseStart,
eUseIterator,
eUseEnd };
nsCOMPtr<nsIContentIterator> mIter;
RangeSubtreeIterState mIterState;
nsCOMPtr<nsINode> mStart;
nsCOMPtr<nsINode> mEnd;
public:
RangeSubtreeIterator()
: mIterState(eDone)
{
}
~RangeSubtreeIterator()
{
}
nsresult Init(nsRange *aRange);
already_AddRefed<nsINode> GetCurrentNode();
void First();
void Last();
void Next();
void Prev();
bool IsDone()
{
return mIterState == eDone;
}
};
nsresult
RangeSubtreeIterator::Init(nsRange *aRange)
{
mIterState = eDone;
if (aRange->Collapsed()) {
return NS_OK;
}
// Grab the start point of the range and QI it to
// a CharacterData pointer. If it is CharacterData store
// a pointer to the node.
ErrorResult rv;
nsCOMPtr<nsINode> node = aRange->GetStartContainer(rv);
if (!node) return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMCharacterData> startData = do_QueryInterface(node);
if (startData || (node->IsElement() &&
node->AsElement()->GetChildCount() == aRange->GetStartOffset(rv))) {
mStart = node;
}
// Grab the end point of the range and QI it to
// a CharacterData pointer. If it is CharacterData store
// a pointer to the node.
node = aRange->GetEndContainer(rv);
if (!node) return NS_ERROR_FAILURE;
nsCOMPtr<nsIDOMCharacterData> endData = do_QueryInterface(node);
if (endData || (node->IsElement() && aRange->GetEndOffset(rv) == 0)) {
mEnd = node;
}
if (mStart && mStart == mEnd)
{
// The range starts and stops in the same CharacterData
// node. Null out the end pointer so we only visit the
// node once!
mEnd = nullptr;
}
else
{
// Now create a Content Subtree Iterator to be used
// for the subtrees between the end points!
mIter = NS_NewContentSubtreeIterator();
nsresult res = mIter->Init(aRange);
if (NS_FAILED(res)) return res;
if (mIter->IsDone())
{
// The subtree iterator thinks there's nothing
// to iterate over, so just free it up so we
// don't accidentally call into it.
mIter = nullptr;
}
}
// Initialize the iterator by calling First().
// Note that we are ignoring the return value on purpose!
First();
return NS_OK;
}
already_AddRefed<nsINode>
RangeSubtreeIterator::GetCurrentNode()
{
nsCOMPtr<nsINode> node;
if (mIterState == eUseStart && mStart) {
node = mStart;
} else if (mIterState == eUseEnd && mEnd) {
node = mEnd;
} else if (mIterState == eUseIterator && mIter) {
node = mIter->GetCurrentNode();
}
return node.forget();
}
void
RangeSubtreeIterator::First()
{
if (mStart)
mIterState = eUseStart;
else if (mIter)
{
mIter->First();
mIterState = eUseIterator;
}
else if (mEnd)
mIterState = eUseEnd;
else
mIterState = eDone;
}
void
RangeSubtreeIterator::Last()
{
if (mEnd)
mIterState = eUseEnd;
else if (mIter)
{
mIter->Last();
mIterState = eUseIterator;
}
else if (mStart)
mIterState = eUseStart;
else
mIterState = eDone;
}
void
RangeSubtreeIterator::Next()
{
if (mIterState == eUseStart)
{
if (mIter)
{
mIter->First();
mIterState = eUseIterator;
}
else if (mEnd)
mIterState = eUseEnd;
else
mIterState = eDone;
}
else if (mIterState == eUseIterator)
{
mIter->Next();
if (mIter->IsDone())
{
if (mEnd)
mIterState = eUseEnd;
else
mIterState = eDone;
}
}
else
mIterState = eDone;
}
void
RangeSubtreeIterator::Prev()
{
if (mIterState == eUseEnd)
{
if (mIter)
{
mIter->Last();
mIterState = eUseIterator;
}
else if (mStart)
mIterState = eUseStart;
else
mIterState = eDone;
}
else if (mIterState == eUseIterator)
{
mIter->Prev();
if (mIter->IsDone())
{
if (mStart)
mIterState = eUseStart;
else
mIterState = eDone;
}
}
else
mIterState = eDone;
}
// CollapseRangeAfterDelete() is a utility method that is used by
// DeleteContents() and ExtractContents() to collapse the range
// in the correct place, under the range's root container (the
// range end points common container) as outlined by the Range spec:
//
// http://www.w3.org/TR/2000/REC-DOM-Level-2-Traversal-Range-20001113/ranges.html
// The assumption made by this method is that the delete or extract
// has been done already, and left the range in a state where there is
// no content between the 2 end points.
static nsresult
CollapseRangeAfterDelete(nsRange* aRange)
{
NS_ENSURE_ARG_POINTER(aRange);
// Check if range gravity took care of collapsing the range for us!
if (aRange->Collapsed())
{
// aRange is collapsed so there's nothing for us to do.
//
// There are 2 possible scenarios here:
//
// 1. aRange could've been collapsed prior to the delete/extract,
// which would've resulted in nothing being removed, so aRange
// is already where it should be.
//
// 2. Prior to the delete/extract, aRange's start and end were in
// the same container which would mean everything between them
// was removed, causing range gravity to collapse the range.
return NS_OK;
}
// aRange isn't collapsed so figure out the appropriate place to collapse!
// First get both end points and their common ancestor.
ErrorResult rv;
nsCOMPtr<nsINode> commonAncestor = aRange->GetCommonAncestorContainer(rv);
if (rv.Failed()) return rv.StealNSResult();
nsCOMPtr<nsINode> startContainer = aRange->GetStartContainer(rv);
if (rv.Failed()) return rv.StealNSResult();
nsCOMPtr<nsINode> endContainer = aRange->GetEndContainer(rv);
if (rv.Failed()) return rv.StealNSResult();
// Collapse to one of the end points if they are already in the
// commonAncestor. This should work ok since this method is called
// immediately after a delete or extract that leaves no content
// between the 2 end points!
if (startContainer == commonAncestor)
return aRange->Collapse(true);
if (endContainer == commonAncestor)
return aRange->Collapse(false);
// End points are at differing levels. We want to collapse to the
// point that is between the 2 subtrees that contain each point,
// under the common ancestor.
nsCOMPtr<nsINode> nodeToSelect(startContainer);
while (nodeToSelect)
{
nsCOMPtr<nsINode> parent = nodeToSelect->GetParentNode();
if (parent == commonAncestor)
break; // We found the nodeToSelect!
nodeToSelect = parent;
}
if (!nodeToSelect)
return NS_ERROR_FAILURE; // This should never happen!
aRange->SelectNode(*nodeToSelect, rv);
if (rv.Failed()) return rv.StealNSResult();
return aRange->Collapse(false);
}
/**
* Split a data node into two parts.
*
* @param aStartNode The original node we are trying to split.
* @param aStartIndex The index at which to split.
* @param aEndNode The second node.
* @param aCloneAfterOriginal Set false if the original node should be the
* latter one after split.
*/
static nsresult SplitDataNode(nsIDOMCharacterData* aStartNode,
uint32_t aStartIndex,
nsIDOMCharacterData** aEndNode,
bool aCloneAfterOriginal = true)
{
nsresult rv;
nsCOMPtr<nsINode> node = do_QueryInterface(aStartNode);
NS_ENSURE_STATE(node && node->IsNodeOfType(nsINode::eDATA_NODE));
nsGenericDOMDataNode* dataNode = static_cast<nsGenericDOMDataNode*>(node.get());
nsCOMPtr<nsIContent> newData;
rv = dataNode->SplitData(aStartIndex, getter_AddRefs(newData),
aCloneAfterOriginal);
NS_ENSURE_SUCCESS(rv, rv);
return CallQueryInterface(newData, aEndNode);
}
NS_IMETHODIMP
PrependChild(nsINode* aParent, nsINode* aChild)
{
nsCOMPtr<nsINode> first = aParent->GetFirstChild();
ErrorResult rv;
aParent->InsertBefore(*aChild, first, rv);
return rv.StealNSResult();
}
// Helper function for CutContents, making sure that the current node wasn't
// removed by mutation events (bug 766426)
static bool
ValidateCurrentNode(nsRange* aRange, RangeSubtreeIterator& aIter)
{
bool before, after;
nsCOMPtr<nsINode> node = aIter.GetCurrentNode();
if (!node) {
// We don't have to worry that the node was removed if it doesn't exist,
// e.g., the iterator is done.
return true;
}
nsresult res = nsRange::CompareNodeToRange(node, aRange, &before, &after);
NS_ENSURE_SUCCESS(res, false);
if (before || after) {
nsCOMPtr<nsIDOMCharacterData> charData = do_QueryInterface(node);
if (charData) {
// If we're dealing with the start/end container which is a character
// node, pretend that the node is in the range.
if (before && node == aRange->GetStartParent()) {
before = false;
}
if (after && node == aRange->GetEndParent()) {
after = false;
}
}
}
return !before && !after;
}
nsresult
nsRange::CutContents(DocumentFragment** aFragment)
{
if (aFragment) {
*aFragment = nullptr;
}
nsCOMPtr<nsIDocument> doc = mStartParent->OwnerDoc();
ErrorResult res;
nsCOMPtr<nsINode> commonAncestor = GetCommonAncestorContainer(res);
NS_ENSURE_TRUE(!res.Failed(), res.StealNSResult());
// If aFragment isn't null, create a temporary fragment to hold our return.
RefPtr<DocumentFragment> retval;
if (aFragment) {
retval = new DocumentFragment(doc->NodeInfoManager());
}
nsCOMPtr<nsINode> commonCloneAncestor = retval.get();
// Batch possible DOMSubtreeModified events.
mozAutoSubtreeModified subtree(mRoot ? mRoot->OwnerDoc(): nullptr, nullptr);
// Save the range end points locally to avoid interference
// of Range gravity during our edits!
nsCOMPtr<nsINode> startContainer = mStartParent;
int32_t startOffset = mStartOffset;
nsCOMPtr<nsINode> endContainer = mEndParent;
int32_t endOffset = mEndOffset;
if (retval) {
// For extractContents(), abort early if there's a doctype (bug 719533).
// This can happen only if the common ancestor is a document, in which case
// we just need to find its doctype child and check if that's in the range.
nsCOMPtr<nsIDocument> commonAncestorDocument = do_QueryInterface(commonAncestor);
if (commonAncestorDocument) {
RefPtr<DocumentType> doctype = commonAncestorDocument->GetDoctype();
if (doctype &&
nsContentUtils::ComparePoints(startContainer, startOffset,
doctype, 0) < 0 &&
nsContentUtils::ComparePoints(doctype, 0,
endContainer, endOffset) < 0) {
return NS_ERROR_DOM_HIERARCHY_REQUEST_ERR;
}
}
}
// Create and initialize a subtree iterator that will give
// us all the subtrees within the range.
RangeSubtreeIterator iter;
nsresult rv = iter.Init(this);
if (NS_FAILED(rv)) return rv;
if (iter.IsDone())
{
// There's nothing for us to delete.
rv = CollapseRangeAfterDelete(this);
if (NS_SUCCEEDED(rv) && aFragment) {
retval.forget(aFragment);
}
return rv;
}
// We delete backwards to avoid iterator problems!
iter.Last();
bool handled = false;
// With the exception of text nodes that contain one of the range
// end points, the subtree iterator should only give us back subtrees
// that are completely contained between the range's end points.
while (!iter.IsDone())
{
nsCOMPtr<nsINode> nodeToResult;
nsCOMPtr<nsINode> node = iter.GetCurrentNode();
// Before we delete anything, advance the iterator to the
// next subtree.
iter.Prev();
handled = false;
// If it's CharacterData, make sure we might need to delete
// part of the data, instead of removing the whole node.
//
// XXX_kin: We need to also handle ProcessingInstruction
// XXX_kin: according to the spec.
nsCOMPtr<nsIDOMCharacterData> charData(do_QueryInterface(node));
if (charData)
{
uint32_t dataLength = 0;
if (node == startContainer)
{
if (node == endContainer)
{
// This range is completely contained within a single text node.
// Delete or extract the data between startOffset and endOffset.
if (endOffset > startOffset)
{
if (retval) {
nsAutoString cutValue;
rv = charData->SubstringData(startOffset, endOffset - startOffset,
cutValue);
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDOMNode> clone;
rv = charData->CloneNode(false, 1, getter_AddRefs(clone));
NS_ENSURE_SUCCESS(rv, rv);
clone->SetNodeValue(cutValue);
nodeToResult = do_QueryInterface(clone);
}
nsMutationGuard guard;
rv = charData->DeleteData(startOffset, endOffset - startOffset);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_STATE(!guard.Mutated(0) ||
ValidateCurrentNode(this, iter));
}
handled = true;
}
else
{
// Delete or extract everything after startOffset.
rv = charData->GetLength(&dataLength);
NS_ENSURE_SUCCESS(rv, rv);
if (dataLength >= (uint32_t)startOffset)
{
nsMutationGuard guard;
nsCOMPtr<nsIDOMCharacterData> cutNode;
rv = SplitDataNode(charData, startOffset, getter_AddRefs(cutNode));
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_STATE(!guard.Mutated(1) ||
ValidateCurrentNode(this, iter));
nodeToResult = do_QueryInterface(cutNode);
}
handled = true;
}
}
else if (node == endContainer)
{
// Delete or extract everything before endOffset.
if (endOffset >= 0)
{
nsMutationGuard guard;
nsCOMPtr<nsIDOMCharacterData> cutNode;
/* The Range spec clearly states clones get cut and original nodes
remain behind, so use false as the last parameter.
*/
rv = SplitDataNode(charData, endOffset, getter_AddRefs(cutNode),
false);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_STATE(!guard.Mutated(1) ||
ValidateCurrentNode(this, iter));
nodeToResult = do_QueryInterface(cutNode);
}
handled = true;
}
}
if (!handled && (node == endContainer || node == startContainer))
{
if (node && node->IsElement() &&
((node == endContainer && endOffset == 0) ||
(node == startContainer &&
int32_t(node->AsElement()->GetChildCount()) == startOffset)))
{
if (retval) {
ErrorResult rv;
nodeToResult = node->CloneNode(false, rv);
NS_ENSURE_TRUE(!rv.Failed(), rv.StealNSResult());
}
handled = true;
}
}
if (!handled)
{
// node was not handled above, so it must be completely contained
// within the range. Just remove it from the tree!
nodeToResult = node;
}
uint32_t parentCount = 0;
// Set the result to document fragment if we have 'retval'.
if (retval) {
nsCOMPtr<nsINode> oldCommonAncestor = commonAncestor;
if (!iter.IsDone()) {
// Setup the parameters for the next iteration of the loop.
nsCOMPtr<nsINode> prevNode = iter.GetCurrentNode();
NS_ENSURE_STATE(prevNode);
// Get node's and prevNode's common parent. Do this before moving
// nodes from original DOM to result fragment.
commonAncestor = nsContentUtils::GetCommonAncestor(node, prevNode);
NS_ENSURE_STATE(commonAncestor);
nsCOMPtr<nsINode> parentCounterNode = node;
while (parentCounterNode && parentCounterNode != commonAncestor)
{
++parentCount;
parentCounterNode = parentCounterNode->GetParentNode();
NS_ENSURE_STATE(parentCounterNode);
}
}
// Clone the parent hierarchy between commonAncestor and node.
nsCOMPtr<nsINode> closestAncestor, farthestAncestor;
rv = CloneParentsBetween(oldCommonAncestor, node,
getter_AddRefs(closestAncestor),
getter_AddRefs(farthestAncestor));
NS_ENSURE_SUCCESS(rv, rv);
if (farthestAncestor)
{
nsCOMPtr<nsINode> n = do_QueryInterface(commonCloneAncestor);
rv = PrependChild(n, farthestAncestor);
NS_ENSURE_SUCCESS(rv, rv);
}
nsMutationGuard guard;
nsCOMPtr<nsINode> parent = nodeToResult->GetParentNode();
rv = closestAncestor ? PrependChild(closestAncestor, nodeToResult)
: PrependChild(commonCloneAncestor, nodeToResult);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_STATE(!guard.Mutated(parent ? 2 : 1) ||
ValidateCurrentNode(this, iter));
} else if (nodeToResult) {
nsMutationGuard guard;
nsCOMPtr<nsINode> node = nodeToResult;
nsCOMPtr<nsINode> parent = node->GetParentNode();
if (parent) {
mozilla::ErrorResult error;
parent->RemoveChild(*node, error);
NS_ENSURE_FALSE(error.Failed(), error.StealNSResult());
}
NS_ENSURE_STATE(!guard.Mutated(1) ||
ValidateCurrentNode(this, iter));
}
if (!iter.IsDone() && retval) {
// Find the equivalent of commonAncestor in the cloned tree.
nsCOMPtr<nsINode> newCloneAncestor = nodeToResult;
for (uint32_t i = parentCount; i; --i)
{
newCloneAncestor = newCloneAncestor->GetParentNode();
NS_ENSURE_STATE(newCloneAncestor);
}
commonCloneAncestor = newCloneAncestor;
}
}
rv = CollapseRangeAfterDelete(this);
if (NS_SUCCEEDED(rv) && aFragment) {
retval.forget(aFragment);
}
return rv;
}
NS_IMETHODIMP
nsRange::DeleteContents()
{
return CutContents(nullptr);
}
void
nsRange::DeleteContents(ErrorResult& aRv)
{
aRv = CutContents(nullptr);
}
NS_IMETHODIMP
nsRange::ExtractContents(nsIDOMDocumentFragment** aReturn)
{
NS_ENSURE_ARG_POINTER(aReturn);
RefPtr<DocumentFragment> fragment;
nsresult rv = CutContents(getter_AddRefs(fragment));
fragment.forget(aReturn);
return rv;
}
already_AddRefed<DocumentFragment>
nsRange::ExtractContents(ErrorResult& rv)
{
RefPtr<DocumentFragment> fragment;
rv = CutContents(getter_AddRefs(fragment));
return fragment.forget();
}
NS_IMETHODIMP
nsRange::CompareBoundaryPoints(uint16_t aHow, nsIDOMRange* aOtherRange,
int16_t* aCmpRet)
{
nsRange* otherRange = static_cast<nsRange*>(aOtherRange);
NS_ENSURE_TRUE(otherRange, NS_ERROR_NULL_POINTER);
ErrorResult rv;
*aCmpRet = CompareBoundaryPoints(aHow, *otherRange, rv);
return rv.StealNSResult();
}
int16_t
nsRange::CompareBoundaryPoints(uint16_t aHow, nsRange& aOtherRange,
ErrorResult& rv)
{
if (!mIsPositioned || !aOtherRange.IsPositioned()) {
rv.Throw(NS_ERROR_NOT_INITIALIZED);
return 0;
}
nsINode *ourNode, *otherNode;
int32_t ourOffset, otherOffset;
switch (aHow) {
case nsIDOMRange::START_TO_START:
ourNode = mStartParent;
ourOffset = mStartOffset;
otherNode = aOtherRange.GetStartParent();
otherOffset = aOtherRange.StartOffset();
break;
case nsIDOMRange::START_TO_END:
ourNode = mEndParent;
ourOffset = mEndOffset;
otherNode = aOtherRange.GetStartParent();
otherOffset = aOtherRange.StartOffset();
break;
case nsIDOMRange::END_TO_START:
ourNode = mStartParent;
ourOffset = mStartOffset;
otherNode = aOtherRange.GetEndParent();
otherOffset = aOtherRange.EndOffset();
break;
case nsIDOMRange::END_TO_END:
ourNode = mEndParent;
ourOffset = mEndOffset;
otherNode = aOtherRange.GetEndParent();
otherOffset = aOtherRange.EndOffset();
break;
default:
// We were passed an illegal value
rv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return 0;
}
if (mRoot != aOtherRange.GetRoot()) {
rv.Throw(NS_ERROR_DOM_WRONG_DOCUMENT_ERR);
return 0;
}
return nsContentUtils::ComparePoints(ourNode, ourOffset,
otherNode, otherOffset);
}
/* static */ nsresult
nsRange::CloneParentsBetween(nsINode *aAncestor,
nsINode *aNode,
nsINode **aClosestAncestor,
nsINode **aFarthestAncestor)
{
NS_ENSURE_ARG_POINTER((aAncestor && aNode && aClosestAncestor && aFarthestAncestor));
*aClosestAncestor = nullptr;
*aFarthestAncestor = nullptr;
if (aAncestor == aNode)
return NS_OK;
nsCOMPtr<nsINode> firstParent, lastParent;
nsCOMPtr<nsINode> parent = aNode->GetParentNode();
while(parent && parent != aAncestor)
{
ErrorResult rv;
nsCOMPtr<nsINode> clone = parent->CloneNode(false, rv);
if (rv.Failed()) {
return rv.StealNSResult();
}
if (!clone) {
return NS_ERROR_FAILURE;
}
if (! firstParent) {
firstParent = lastParent = clone;
} else {
clone->AppendChild(*lastParent, rv);
if (rv.Failed()) return rv.StealNSResult();
lastParent = clone;
}
parent = parent->GetParentNode();
}
*aClosestAncestor = firstParent;
NS_IF_ADDREF(*aClosestAncestor);
*aFarthestAncestor = lastParent;
NS_IF_ADDREF(*aFarthestAncestor);
return NS_OK;
}
NS_IMETHODIMP
nsRange::CloneContents(nsIDOMDocumentFragment** aReturn)
{
ErrorResult rv;
*aReturn = CloneContents(rv).take();
return rv.StealNSResult();
}
already_AddRefed<DocumentFragment>
nsRange::CloneContents(ErrorResult& aRv)
{
nsCOMPtr<nsINode> commonAncestor = GetCommonAncestorContainer(aRv);
MOZ_ASSERT(!aRv.Failed(), "GetCommonAncestorContainer() shouldn't fail!");
nsCOMPtr<nsIDocument> doc = mStartParent->OwnerDoc();
NS_ASSERTION(doc, "CloneContents needs a document to continue.");
if (!doc) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
// Create a new document fragment in the context of this document,
// which might be null
RefPtr<DocumentFragment> clonedFrag =
new DocumentFragment(doc->NodeInfoManager());
nsCOMPtr<nsINode> commonCloneAncestor = clonedFrag.get();
// Create and initialize a subtree iterator that will give
// us all the subtrees within the range.
RangeSubtreeIterator iter;
aRv = iter.Init(this);
if (aRv.Failed()) {
return nullptr;
}
if (iter.IsDone())
{
// There's nothing to add to the doc frag, we must be done!
return clonedFrag.forget();
}
iter.First();
// With the exception of text nodes that contain one of the range
// end points and elements which don't have any content selected the subtree
// iterator should only give us back subtrees that are completely contained
// between the range's end points.
//
// Unfortunately these subtrees don't contain the parent hierarchy/context
// that the Range spec requires us to return. This loop clones the
// parent hierarchy, adds a cloned version of the subtree, to it, then
// correctly places this new subtree into the doc fragment.
while (!iter.IsDone())
{
nsCOMPtr<nsINode> node = iter.GetCurrentNode();
bool deepClone = !node->IsElement() ||
(!(node == mEndParent && mEndOffset == 0) &&
!(node == mStartParent &&
mStartOffset ==
int32_t(node->AsElement()->GetChildCount())));
// Clone the current subtree!
nsCOMPtr<nsINode> clone = node->CloneNode(deepClone, aRv);
if (aRv.Failed()) {
return nullptr;
}
// If it's CharacterData, make sure we only clone what
// is in the range.
//
// XXX_kin: We need to also handle ProcessingInstruction
// XXX_kin: according to the spec.
nsCOMPtr<nsIDOMCharacterData> charData(do_QueryInterface(clone));
if (charData)
{
if (node == mEndParent)
{
// We only need the data before mEndOffset, so get rid of any
// data after it.
uint32_t dataLength = 0;
aRv = charData->GetLength(&dataLength);
if (aRv.Failed()) {
return nullptr;
}
if (dataLength > (uint32_t)mEndOffset)
{
aRv = charData->DeleteData(mEndOffset, dataLength - mEndOffset);
if (aRv.Failed()) {
return nullptr;
}
}
}
if (node == mStartParent)
{
// We don't need any data before mStartOffset, so just
// delete it!
if (mStartOffset > 0)
{
aRv = charData->DeleteData(0, mStartOffset);
if (aRv.Failed()) {
return nullptr;
}
}
}
}
// Clone the parent hierarchy between commonAncestor and node.
nsCOMPtr<nsINode> closestAncestor, farthestAncestor;
aRv = CloneParentsBetween(commonAncestor, node,
getter_AddRefs(closestAncestor),
getter_AddRefs(farthestAncestor));
if (aRv.Failed()) {
return nullptr;
}
// Hook the parent hierarchy/context of the subtree into the clone tree.
if (farthestAncestor)
{
commonCloneAncestor->AppendChild(*farthestAncestor, aRv);
if (aRv.Failed()) {
return nullptr;
}
}
// Place the cloned subtree into the cloned doc frag tree!
nsCOMPtr<nsINode> cloneNode = do_QueryInterface(clone);
if (closestAncestor)
{
// Append the subtree under closestAncestor since it is the
// immediate parent of the subtree.
closestAncestor->AppendChild(*cloneNode, aRv);
}
else
{
// If we get here, there is no missing parent hierarchy between
// commonAncestor and node, so just append clone to commonCloneAncestor.
commonCloneAncestor->AppendChild(*cloneNode, aRv);
}
if (aRv.Failed()) {
return nullptr;
}
// Get the next subtree to be processed. The idea here is to setup
// the parameters for the next iteration of the loop.
iter.Next();
if (iter.IsDone())
break; // We must be done!
nsCOMPtr<nsINode> nextNode = iter.GetCurrentNode();
if (!nextNode) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
// Get node and nextNode's common parent.
commonAncestor = nsContentUtils::GetCommonAncestor(node, nextNode);
if (!commonAncestor) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
// Find the equivalent of commonAncestor in the cloned tree!
while (node && node != commonAncestor)
{
node = node->GetParentNode();
if (aRv.Failed()) {
return nullptr;
}
if (!node) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
cloneNode = cloneNode->GetParentNode();
if (!cloneNode) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
}
commonCloneAncestor = cloneNode;
}
return clonedFrag.forget();
}
already_AddRefed<nsRange>
nsRange::CloneRange() const
{
RefPtr<nsRange> range = new nsRange(mOwner);
range->SetMaySpanAnonymousSubtrees(mMaySpanAnonymousSubtrees);
range->DoSetRange(mStartParent, mStartOffset, mEndParent, mEndOffset, mRoot);
return range.forget();
}
NS_IMETHODIMP
nsRange::CloneRange(nsIDOMRange** aReturn)
{
*aReturn = CloneRange().take();
return NS_OK;
}
NS_IMETHODIMP
nsRange::InsertNode(nsIDOMNode* aNode)
{
nsCOMPtr<nsINode> node = do_QueryInterface(aNode);
if (!node) {
return NS_ERROR_DOM_NOT_OBJECT_ERR;
}
ErrorResult rv;
InsertNode(*node, rv);
return rv.StealNSResult();
}
void
nsRange::InsertNode(nsINode& aNode, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
int32_t tStartOffset = StartOffset();
nsCOMPtr<nsINode> tStartContainer = GetStartContainer(aRv);
if (aRv.Failed()) {
return;
}
// This is the node we'll be inserting before, and its parent
nsCOMPtr<nsINode> referenceNode;
nsCOMPtr<nsINode> referenceParentNode = tStartContainer;
nsCOMPtr<nsIDOMText> startTextNode(do_QueryInterface(tStartContainer));
nsCOMPtr<nsIDOMNodeList> tChildList;
if (startTextNode) {
referenceParentNode = tStartContainer->GetParentNode();
if (!referenceParentNode) {
aRv.Throw(NS_ERROR_DOM_HIERARCHY_REQUEST_ERR);
return;
}
referenceParentNode->EnsurePreInsertionValidity(aNode, tStartContainer,
aRv);
if (aRv.Failed()) {
return;
}
nsCOMPtr<nsIDOMText> secondPart;
aRv = startTextNode->SplitText(tStartOffset, getter_AddRefs(secondPart));
if (aRv.Failed()) {
return;
}
referenceNode = do_QueryInterface(secondPart);
} else {
aRv = tStartContainer->AsDOMNode()->GetChildNodes(getter_AddRefs(tChildList));
if (aRv.Failed()) {
return;
}
// find the insertion point in the DOM and insert the Node
nsCOMPtr<nsIDOMNode> q;
aRv = tChildList->Item(tStartOffset, getter_AddRefs(q));
referenceNode = do_QueryInterface(q);
if (aRv.Failed()) {
return;
}
tStartContainer->EnsurePreInsertionValidity(aNode, referenceNode, aRv);
if (aRv.Failed()) {
return;
}
}
// We might need to update the end to include the new node (bug 433662).
// Ideally we'd only do this if needed, but it's tricky to know when it's
// needed in advance (bug 765799).
int32_t newOffset;
if (referenceNode) {
newOffset = IndexOf(referenceNode);
} else {
uint32_t length;
aRv = tChildList->GetLength(&length);
if (aRv.Failed()) {
return;
}
newOffset = length;
}
if (aNode.NodeType() == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) {
newOffset += aNode.GetChildCount();
} else {
newOffset++;
}
// Now actually insert the node
nsCOMPtr<nsINode> tResultNode;
tResultNode = referenceParentNode->InsertBefore(aNode, referenceNode, aRv);
if (aRv.Failed()) {
return;
}
if (Collapsed()) {
aRv = SetEnd(referenceParentNode, newOffset);
}
}
NS_IMETHODIMP
nsRange::SurroundContents(nsIDOMNode* aNewParent)
{
nsCOMPtr<nsINode> node = do_QueryInterface(aNewParent);
if (!node) {
return NS_ERROR_DOM_NOT_OBJECT_ERR;
}
ErrorResult rv;
SurroundContents(*node, rv);
return rv.StealNSResult();
}
void
nsRange::SurroundContents(nsINode& aNewParent, ErrorResult& aRv)
{
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aNewParent)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return;
}
if (!mRoot) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
// INVALID_STATE_ERROR: Raised if the Range partially selects a non-text
// node.
if (mStartParent != mEndParent) {
bool startIsText = mStartParent->IsNodeOfType(nsINode::eTEXT);
bool endIsText = mEndParent->IsNodeOfType(nsINode::eTEXT);
nsINode* startGrandParent = mStartParent->GetParentNode();
nsINode* endGrandParent = mEndParent->GetParentNode();
if (!((startIsText && endIsText &&
startGrandParent &&
startGrandParent == endGrandParent) ||
(startIsText &&
startGrandParent &&
startGrandParent == mEndParent) ||
(endIsText &&
endGrandParent &&
endGrandParent == mStartParent))) {
aRv.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
return;
}
}
// INVALID_NODE_TYPE_ERROR if aNewParent is something that can't be inserted
// (Document, DocumentType, DocumentFragment)
uint16_t nodeType = aNewParent.NodeType();
if (nodeType == nsIDOMNode::DOCUMENT_NODE ||
nodeType == nsIDOMNode::DOCUMENT_TYPE_NODE ||
nodeType == nsIDOMNode::DOCUMENT_FRAGMENT_NODE) {
aRv.Throw(NS_ERROR_DOM_INVALID_NODE_TYPE_ERR);
return;
}
// Extract the contents within the range.
RefPtr<DocumentFragment> docFrag = ExtractContents(aRv);
if (aRv.Failed()) {
return;
}
if (!docFrag) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
// Spec says we need to remove all of aNewParent's
// children prior to insertion.
nsCOMPtr<nsINodeList> children = aNewParent.ChildNodes();
if (!children) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
uint32_t numChildren = children->Length();
while (numChildren)
{
nsCOMPtr<nsINode> child = children->Item(--numChildren);
if (!child) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
aNewParent.RemoveChild(*child, aRv);
if (aRv.Failed()) {
return;
}
}
// Insert aNewParent at the range's start point.
InsertNode(aNewParent, aRv);
if (aRv.Failed()) {
return;
}
// Append the content we extracted under aNewParent.
aNewParent.AppendChild(*docFrag, aRv);
if (aRv.Failed()) {
return;
}
// Select aNewParent, and its contents.
SelectNode(aNewParent, aRv);
}
NS_IMETHODIMP
nsRange::ToString(nsAString& aReturn)
{
// clear the string
aReturn.Truncate();
// If we're unpositioned, return the empty string
if (!mIsPositioned) {
return NS_OK;
}
#ifdef DEBUG_range
printf("Range dump: -----------------------\n");
#endif /* DEBUG */
// effeciency hack for simple case
if (mStartParent == mEndParent)
{
nsCOMPtr<nsIDOMText> textNode( do_QueryInterface(mStartParent) );
if (textNode)
{
#ifdef DEBUG_range
// If debug, dump it:
nsCOMPtr<nsIContent> cN (do_QueryInterface(mStartParent));
if (cN) cN->List(stdout);
printf("End Range dump: -----------------------\n");
#endif /* DEBUG */
// grab the text
if (NS_FAILED(textNode->SubstringData(mStartOffset,mEndOffset-mStartOffset,aReturn)))
return NS_ERROR_UNEXPECTED;
return NS_OK;
}
}
/* complex case: mStartParent != mEndParent, or mStartParent not a text node
revisit - there are potential optimizations here and also tradeoffs.
*/
nsCOMPtr<nsIContentIterator> iter = NS_NewContentIterator();
nsresult rv = iter->Init(this);
NS_ENSURE_SUCCESS(rv, rv);
nsString tempString;
// loop through the content iterator, which returns nodes in the range in
// close tag order, and grab the text from any text node
while (!iter->IsDone())
{
nsINode *n = iter->GetCurrentNode();
#ifdef DEBUG_range
// If debug, dump it:
n->List(stdout);
#endif /* DEBUG */
nsCOMPtr<nsIDOMText> textNode(do_QueryInterface(n));
if (textNode) // if it's a text node, get the text
{
if (n == mStartParent) // only include text past start offset
{
uint32_t strLength;
textNode->GetLength(&strLength);
textNode->SubstringData(mStartOffset,strLength-mStartOffset,tempString);
aReturn += tempString;
}
else if (n == mEndParent) // only include text before end offset
{
textNode->SubstringData(0,mEndOffset,tempString);
aReturn += tempString;
}
else // grab the whole kit-n-kaboodle
{
textNode->GetData(tempString);
aReturn += tempString;
}
}
iter->Next();
}
#ifdef DEBUG_range
printf("End Range dump: -----------------------\n");
#endif /* DEBUG */
return NS_OK;
}
NS_IMETHODIMP
nsRange::Detach()
{
return NS_OK;
}
NS_IMETHODIMP
nsRange::CreateContextualFragment(const nsAString& aFragment,
nsIDOMDocumentFragment** aReturn)
{
if (mIsPositioned) {
return nsContentUtils::CreateContextualFragment(mStartParent, aFragment,
false, aReturn);
}
return NS_ERROR_FAILURE;
}
already_AddRefed<DocumentFragment>
nsRange::CreateContextualFragment(const nsAString& aFragment, ErrorResult& aRv)
{
if (!mIsPositioned) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
return nsContentUtils::CreateContextualFragment(mStartParent, aFragment,
false, aRv);
}
static void ExtractRectFromOffset(nsIFrame* aFrame,
const int32_t aOffset, nsRect* aR, bool aKeepLeft,
bool aClampToEdge)
{
nsPoint point;
aFrame->GetPointFromOffset(aOffset, &point);
if (!aClampToEdge && !aR->Contains(point)) {
aR->width = 0;
aR->x = point.x;
return;
}
if (aClampToEdge) {
point = aR->ClampPoint(point);
}
if (aKeepLeft) {
aR->width = point.x - aR->x;
} else {
aR->width = aR->XMost() - point.x;
aR->x = point.x;
}
}
static nsTextFrame*
GetTextFrameForContent(nsIContent* aContent, bool aFlushLayout)
{
nsIPresShell* presShell = aContent->OwnerDoc()->GetShell();
if (presShell) {
presShell->FrameConstructor()->EnsureFrameForTextNode(
static_cast<nsGenericDOMDataNode*>(aContent));
if (aFlushLayout) {
aContent->OwnerDoc()->FlushPendingNotifications(Flush_Layout);
}
nsIFrame* frame = aContent->GetPrimaryFrame();
if (frame && frame->GetType() == nsGkAtoms::textFrame) {
return static_cast<nsTextFrame*>(frame);
}
}
return nullptr;
}
static nsresult GetPartialTextRect(nsLayoutUtils::RectCallback* aCallback,
nsIContent* aContent, int32_t aStartOffset,
int32_t aEndOffset, bool aClampToEdge,
bool aFlushLayout)
{
nsTextFrame* textFrame = GetTextFrameForContent(aContent, aFlushLayout);
if (textFrame) {
nsIFrame* relativeTo = nsLayoutUtils::GetContainingBlockForClientRect(textFrame);
for (nsTextFrame* f = textFrame; f; f = static_cast<nsTextFrame*>(f->GetNextContinuation())) {
int32_t fstart = f->GetContentOffset(), fend = f->GetContentEnd();
if (fend <= aStartOffset || fstart >= aEndOffset)
continue;
// overlapping with the offset we want
f->EnsureTextRun(nsTextFrame::eInflated);
NS_ENSURE_TRUE(f->GetTextRun(nsTextFrame::eInflated), NS_ERROR_OUT_OF_MEMORY);
bool rtl = f->GetTextRun(nsTextFrame::eInflated)->IsRightToLeft();
nsRect r = f->GetRectRelativeToSelf();
if (fstart < aStartOffset) {
// aStartOffset is within this frame
ExtractRectFromOffset(f, aStartOffset, &r, rtl, aClampToEdge);
}
if (fend > aEndOffset) {
// aEndOffset is in the middle of this frame
ExtractRectFromOffset(f, aEndOffset, &r, !rtl, aClampToEdge);
}
r = nsLayoutUtils::TransformFrameRectToAncestor(f, r, relativeTo);
aCallback->AddRect(r);
}
}
return NS_OK;
}
/* static */ void
nsRange::CollectClientRects(nsLayoutUtils::RectCallback* aCollector,
nsRange* aRange,
nsINode* aStartParent, int32_t aStartOffset,
nsINode* aEndParent, int32_t aEndOffset,
bool aClampToEdge, bool aFlushLayout)
{
// Hold strong pointers across the flush
nsCOMPtr<nsINode> startContainer = aStartParent;
nsCOMPtr<nsINode> endContainer = aEndParent;
// Flush out layout so our frames are up to date.
if (!aStartParent->IsInUncomposedDoc()) {
return;
}
if (aFlushLayout) {
aStartParent->OwnerDoc()->FlushPendingNotifications(Flush_Layout);
// Recheck whether we're still in the document
if (!aStartParent->IsInUncomposedDoc()) {
return;
}
}
RangeSubtreeIterator iter;
nsresult rv = iter.Init(aRange);
if (NS_FAILED(rv)) return;
if (iter.IsDone()) {
// the range is collapsed, only continue if the cursor is in a text node
nsCOMPtr<nsIContent> content = do_QueryInterface(aStartParent);
if (content && content->IsNodeOfType(nsINode::eTEXT)) {
nsTextFrame* textFrame = GetTextFrameForContent(content, aFlushLayout);
if (textFrame) {
int32_t outOffset;
nsIFrame* outFrame;
textFrame->GetChildFrameContainingOffset(aStartOffset, false,
&outOffset, &outFrame);
if (outFrame) {
nsIFrame* relativeTo =
nsLayoutUtils::GetContainingBlockForClientRect(outFrame);
nsRect r = outFrame->GetRectRelativeToSelf();
ExtractRectFromOffset(outFrame, aStartOffset, &r, false, aClampToEdge);
r.width = 0;
r = nsLayoutUtils::TransformFrameRectToAncestor(outFrame, r, relativeTo);
aCollector->AddRect(r);
}
}
}
return;
}
do {
nsCOMPtr<nsINode> node = iter.GetCurrentNode();
iter.Next();
nsCOMPtr<nsIContent> content = do_QueryInterface(node);
if (!content)
continue;
if (content->IsNodeOfType(nsINode::eTEXT)) {
if (node == startContainer) {
int32_t offset = startContainer == endContainer ?
aEndOffset : content->GetText()->GetLength();
GetPartialTextRect(aCollector, content, aStartOffset, offset,
aClampToEdge, aFlushLayout);
continue;
} else if (node == endContainer) {
GetPartialTextRect(aCollector, content, 0, aEndOffset,
aClampToEdge, aFlushLayout);
continue;
}
}
nsIFrame* frame = content->GetPrimaryFrame();
if (frame) {
nsLayoutUtils::GetAllInFlowRects(frame,
nsLayoutUtils::GetContainingBlockForClientRect(frame), aCollector,
nsLayoutUtils::RECTS_ACCOUNT_FOR_TRANSFORMS);
}
} while (!iter.IsDone());
}
NS_IMETHODIMP
nsRange::GetBoundingClientRect(nsIDOMClientRect** aResult)
{
*aResult = GetBoundingClientRect(true).take();
return NS_OK;
}
already_AddRefed<DOMRect>
nsRange::GetBoundingClientRect(bool aClampToEdge, bool aFlushLayout)
{
RefPtr<DOMRect> rect = new DOMRect(ToSupports(this));
if (!mStartParent) {
return rect.forget();
}
nsLayoutUtils::RectAccumulator accumulator;
CollectClientRects(&accumulator, this, mStartParent, mStartOffset,
mEndParent, mEndOffset, aClampToEdge, aFlushLayout);
nsRect r = accumulator.mResultRect.IsEmpty() ? accumulator.mFirstRect :
accumulator.mResultRect;
rect->SetLayoutRect(r);
return rect.forget();
}
NS_IMETHODIMP
nsRange::GetClientRects(nsIDOMClientRectList** aResult)
{
*aResult = GetClientRects(true).take();
return NS_OK;
}
already_AddRefed<DOMRectList>
nsRange::GetClientRects(bool aClampToEdge, bool aFlushLayout)
{
if (!mStartParent) {
return nullptr;
}
RefPtr<DOMRectList> rectList =
new DOMRectList(static_cast<nsIDOMRange*>(this));
nsLayoutUtils::RectListBuilder builder(rectList);
CollectClientRects(&builder, this, mStartParent, mStartOffset,
mEndParent, mEndOffset, aClampToEdge, aFlushLayout);
return rectList.forget();
}
NS_IMETHODIMP
nsRange::GetUsedFontFaces(nsIDOMFontFaceList** aResult)
{
*aResult = nullptr;
NS_ENSURE_TRUE(mStartParent, NS_ERROR_UNEXPECTED);
nsCOMPtr<nsINode> startContainer = do_QueryInterface(mStartParent);
nsCOMPtr<nsINode> endContainer = do_QueryInterface(mEndParent);
// Flush out layout so our frames are up to date.
nsIDocument* doc = mStartParent->OwnerDoc();
NS_ENSURE_TRUE(doc, NS_ERROR_UNEXPECTED);
doc->FlushPendingNotifications(Flush_Frames);
// Recheck whether we're still in the document
NS_ENSURE_TRUE(mStartParent->IsInUncomposedDoc(), NS_ERROR_UNEXPECTED);
RefPtr<nsFontFaceList> fontFaceList = new nsFontFaceList();
RangeSubtreeIterator iter;
nsresult rv = iter.Init(this);
NS_ENSURE_SUCCESS(rv, rv);
while (!iter.IsDone()) {
// only collect anything if the range is not collapsed
nsCOMPtr<nsINode> node = iter.GetCurrentNode();
iter.Next();
nsCOMPtr<nsIContent> content = do_QueryInterface(node);
if (!content) {
continue;
}
nsIFrame* frame = content->GetPrimaryFrame();
if (!frame) {
continue;
}
if (content->IsNodeOfType(nsINode::eTEXT)) {
if (node == startContainer) {
int32_t offset = startContainer == endContainer ?
mEndOffset : content->GetText()->GetLength();
nsLayoutUtils::GetFontFacesForText(frame, mStartOffset, offset,
true, fontFaceList);
continue;
}
if (node == endContainer) {
nsLayoutUtils::GetFontFacesForText(frame, 0, mEndOffset,
true, fontFaceList);
continue;
}
}
nsLayoutUtils::GetFontFacesForFrames(frame, fontFaceList);
}
fontFaceList.forget(aResult);
return NS_OK;
}
nsINode*
nsRange::GetRegisteredCommonAncestor()
{
NS_ASSERTION(IsInSelection(),
"GetRegisteredCommonAncestor only valid for range in selection");
nsINode* ancestor = GetNextRangeCommonAncestor(mStartParent);
while (ancestor) {
RangeHashTable* ranges =
static_cast<RangeHashTable*>(ancestor->GetProperty(nsGkAtoms::range));
if (ranges->GetEntry(this)) {
break;
}
ancestor = GetNextRangeCommonAncestor(ancestor->GetParentNode());
}
NS_ASSERTION(ancestor, "can't find common ancestor for selected range");
return ancestor;
}
/* static */ bool nsRange::AutoInvalidateSelection::mIsNested;
nsRange::AutoInvalidateSelection::~AutoInvalidateSelection()
{
NS_ASSERTION(mWasInSelection == mRange->IsInSelection(),
"Range got unselected in AutoInvalidateSelection block");
if (!mCommonAncestor) {
return;
}
mIsNested = false;
::InvalidateAllFrames(mCommonAncestor);
nsINode* commonAncestor = mRange->GetRegisteredCommonAncestor();
if (commonAncestor != mCommonAncestor) {
::InvalidateAllFrames(commonAncestor);
}
}
/* static */ already_AddRefed<nsRange>
nsRange::Constructor(const GlobalObject& aGlobal,
ErrorResult& aRv)
{
nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal.GetAsSupports());
if (!window || !window->GetDoc()) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
return window->GetDoc()->CreateRange(aRv);
}
static bool ExcludeIfNextToNonSelectable(nsIContent* aContent)
{
return aContent->IsNodeOfType(nsINode::eTEXT) &&
aContent->HasFlag(NS_CREATE_FRAME_IF_NON_WHITESPACE);
}
void
nsRange::ExcludeNonSelectableNodes(nsTArray<RefPtr<nsRange>>* aOutRanges)
{
MOZ_ASSERT(mIsPositioned);
MOZ_ASSERT(mEndParent);
MOZ_ASSERT(mStartParent);
nsRange* range = this;
RefPtr<nsRange> newRange;
while (range) {
nsCOMPtr<nsIContentIterator> iter = NS_NewPreContentIterator();
nsresult rv = iter->Init(range);
if (NS_FAILED(rv)) {
return;
}
bool added = false;
bool seenSelectable = false;
// |firstNonSelectableContent| is the first node in a consecutive sequence
// of non-IsSelectable nodes. When we find a selectable node after such
// a sequence we'll end the last nsRange, create a new one and restart
// the outer loop.
nsIContent* firstNonSelectableContent = nullptr;
while (true) {
ErrorResult err;
nsINode* node = iter->GetCurrentNode();
iter->Next();
bool selectable = true;
nsIContent* content =
node && node->IsContent() ? node->AsContent() : nullptr;
if (content) {
if (firstNonSelectableContent && ExcludeIfNextToNonSelectable(content)) {
// Ignorable whitespace next to a sequence of non-selectable nodes
// counts as non-selectable (bug 1216001).
selectable = false;
}
if (selectable) {
nsIFrame* frame = content->GetPrimaryFrame();
for (nsIContent* p = content; !frame && (p = p->GetParent()); ) {
frame = p->GetPrimaryFrame();
}
if (frame) {
frame->IsSelectable(&selectable, nullptr);
}
}
}
if (!selectable) {
if (!firstNonSelectableContent) {
firstNonSelectableContent = content;
}
if (iter->IsDone() && seenSelectable) {
// The tail end of the initial range is non-selectable - truncate the
// current range before the first non-selectable node.
range->SetEndBefore(*firstNonSelectableContent, err);
}
} else if (firstNonSelectableContent) {
if (range == this && !seenSelectable) {
// This is the initial range and all its nodes until now are
// non-selectable so just trim them from the start.
range->SetStartBefore(*node, err);
if (err.Failed()) {
return;
}
break; // restart the same range with a new iterator
} else {
// Save the end point before truncating the range.
nsINode* endParent = range->mEndParent;
int32_t endOffset = range->mEndOffset;
// Truncate the current range before the first non-selectable node.
range->SetEndBefore(*firstNonSelectableContent, err);
// Store it in the result (strong ref) - do this before creating
// a new range in |newRange| below so we don't drop the last ref
// to the range created in the previous iteration.
if (!added && !err.Failed()) {
aOutRanges->AppendElement(range);
}
// Create a new range for the remainder.
rv = CreateRange(node, 0, endParent, endOffset,
getter_AddRefs(newRange));
if (NS_FAILED(rv) || newRange->Collapsed()) {
newRange = nullptr;
}
range = newRange;
break; // create a new iterator for the new range, if any
}
} else {
seenSelectable = true;
if (!added) {
added = true;
aOutRanges->AppendElement(range);
}
}
if (iter->IsDone()) {
return;
}
}
}
}
struct InnerTextAccumulator
{
explicit InnerTextAccumulator(mozilla::dom::DOMString& aValue)
: mString(aValue.AsAString()), mRequiredLineBreakCount(0) {}
void FlushLineBreaks()
{
while (mRequiredLineBreakCount > 0) {
// Required line breaks at the start of the text are suppressed.
if (!mString.IsEmpty()) {
mString.Append('\n');
}
--mRequiredLineBreakCount;
}
}
void Append(char aCh)
{
Append(nsAutoString(aCh));
}
void Append(const nsAString& aString)
{
if (aString.IsEmpty()) {
return;
}
FlushLineBreaks();
mString.Append(aString);
}
void AddRequiredLineBreakCount(int8_t aCount)
{
mRequiredLineBreakCount = std::max(mRequiredLineBreakCount, aCount);
}
nsAString& mString;
int8_t mRequiredLineBreakCount;
};
static bool
IsVisibleAndNotInReplacedElement(nsIFrame* aFrame)
{
if (!aFrame || !aFrame->StyleVisibility()->IsVisible()) {
return false;
}
for (nsIFrame* f = aFrame->GetParent(); f; f = f->GetParent()) {
if (f->IsFrameOfType(nsIFrame::eReplaced) &&
!f->GetContent()->IsHTMLElement(nsGkAtoms::button)) {
return false;
}
}
return true;
}
static bool
ElementIsVisible(Element* aElement)
{
if (!aElement) {
return false;
}
RefPtr<nsStyleContext> sc = nsComputedDOMStyle::GetStyleContextForElement(
aElement, nullptr, nullptr);
return sc && sc->StyleVisibility()->IsVisible();
}
static void
AppendTransformedText(InnerTextAccumulator& aResult,
nsGenericDOMDataNode* aTextNode,
int32_t aStart, int32_t aEnd)
{
nsIFrame* frame = aTextNode->GetPrimaryFrame();
if (!IsVisibleAndNotInReplacedElement(frame)) {
return;
}
nsIFrame::RenderedText text = frame->GetRenderedText(aStart, aEnd);
aResult.Append(text.mString);
}
/**
* States for tree traversal. AT_NODE means that we are about to enter
* the current DOM node. AFTER_NODE means that we have just finished traversing
* the children of the current DOM node and are about to apply any
* "after processing the node's children" steps before we finish visiting
* the node.
*/
enum TreeTraversalState {
AT_NODE,
AFTER_NODE
};
static int8_t
GetRequiredInnerTextLineBreakCount(nsIFrame* aFrame)
{
if (aFrame->GetContent()->IsHTMLElement(nsGkAtoms::p)) {
return 2;
}
const nsStyleDisplay* styleDisplay = aFrame->StyleDisplay();
if (styleDisplay->IsBlockOutside(aFrame) ||
styleDisplay->mDisplay == NS_STYLE_DISPLAY_TABLE_CAPTION) {
return 1;
}
return 0;
}
static bool
IsLastCellOfRow(nsIFrame* aFrame)
{
nsIAtom* type = aFrame->GetType();
if (type != nsGkAtoms::tableCellFrame &&
type != nsGkAtoms::bcTableCellFrame) {
return true;
}
for (nsIFrame* c = aFrame; c; c = c->GetNextContinuation()) {
if (c->GetNextSibling()) {
return false;
}
}
return true;
}
static bool
IsLastRowOfRowGroup(nsIFrame* aFrame)
{
if (aFrame->GetType() != nsGkAtoms::tableRowFrame) {
return true;
}
for (nsIFrame* c = aFrame; c; c = c->GetNextContinuation()) {
if (c->GetNextSibling()) {
return false;
}
}
return true;
}
static bool
IsLastNonemptyRowGroupOfTable(nsIFrame* aFrame)
{
if (aFrame->GetType() != nsGkAtoms::tableRowGroupFrame) {
return true;
}
for (nsIFrame* c = aFrame; c; c = c->GetNextContinuation()) {
for (nsIFrame* next = c->GetNextSibling(); next; next = next->GetNextSibling()) {
if (next->PrincipalChildList().FirstChild()) {
return false;
}
}
}
return true;
}
void
nsRange::GetInnerTextNoFlush(DOMString& aValue, ErrorResult& aError,
nsIContent* aStartParent, uint32_t aStartOffset,
nsIContent* aEndParent, uint32_t aEndOffset)
{
InnerTextAccumulator result(aValue);
nsIContent* currentNode = aStartParent;
TreeTraversalState currentState = AFTER_NODE;
if (aStartParent->IsNodeOfType(nsINode::eTEXT)) {
auto t = static_cast<nsGenericDOMDataNode*>(aStartParent);
if (aStartParent == aEndParent) {
AppendTransformedText(result, t, aStartOffset, aEndOffset);
return;
}
AppendTransformedText(result, t, aStartOffset, t->TextLength());
} else {
if (uint32_t(aStartOffset) < aStartParent->GetChildCount()) {
currentNode = aStartParent->GetChildAt(aStartOffset);
currentState = AT_NODE;
}
}
nsIContent* endNode = aEndParent;
TreeTraversalState endState = AFTER_NODE;
if (aEndParent->IsNodeOfType(nsINode::eTEXT)) {
endState = AT_NODE;
} else {
if (uint32_t(aEndOffset) < aEndParent->GetChildCount()) {
endNode = aEndParent->GetChildAt(aEndOffset);
endState = AT_NODE;
}
}
while (currentNode != endNode || currentState != endState) {
nsIFrame* f = currentNode->GetPrimaryFrame();
bool isVisibleAndNotReplaced = IsVisibleAndNotInReplacedElement(f);
if (currentState == AT_NODE) {
bool isText = currentNode->IsNodeOfType(nsINode::eTEXT);
if (isText && currentNode->GetParent()->IsHTMLElement(nsGkAtoms::rp) &&
ElementIsVisible(currentNode->GetParent()->AsElement())) {
nsAutoString str;
currentNode->GetTextContent(str, aError);
result.Append(str);
} else if (isVisibleAndNotReplaced) {
result.AddRequiredLineBreakCount(GetRequiredInnerTextLineBreakCount(f));
if (isText) {
nsIFrame::RenderedText text = f->GetRenderedText();
result.Append(text.mString);
}
}
nsIContent* child = currentNode->GetFirstChild();
if (child) {
currentNode = child;
continue;
}
currentState = AFTER_NODE;
}
if (currentNode == endNode && currentState == endState) {
break;
}
if (isVisibleAndNotReplaced) {
if (currentNode->IsHTMLElement(nsGkAtoms::br)) {
result.Append('\n');
}
switch (f->StyleDisplay()->mDisplay) {
case NS_STYLE_DISPLAY_TABLE_CELL:
if (!IsLastCellOfRow(f)) {
result.Append('\t');
}
break;
case NS_STYLE_DISPLAY_TABLE_ROW:
if (!IsLastRowOfRowGroup(f) ||
!IsLastNonemptyRowGroupOfTable(f->GetParent())) {
result.Append('\n');
}
break;
}
result.AddRequiredLineBreakCount(GetRequiredInnerTextLineBreakCount(f));
}
nsIContent* next = currentNode->GetNextSibling();
if (next) {
currentNode = next;
currentState = AT_NODE;
} else {
currentNode = currentNode->GetParent();
}
}
if (aEndParent->IsNodeOfType(nsINode::eTEXT)) {
nsGenericDOMDataNode* t = static_cast<nsGenericDOMDataNode*>(aEndParent);
AppendTransformedText(result, t, 0, aEndOffset);
}
// Do not flush trailing line breaks! Required breaks at the end of the text
// are suppressed.
}
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