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gecko-dev/dom/base/nsDocumentEncoder.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/. */
/*
* Object that can be used to serialize selections, ranges, or nodes
* to strings in a gazillion different ways.
*/
#include "nsIDocumentEncoder.h"
#include "nscore.h"
#include "nsIFactory.h"
#include "nsISupports.h"
#include "nsIDocument.h"
#include "nsIHTMLDocument.h"
#include "nsCOMPtr.h"
#include "nsIContentSerializer.h"
#include "mozilla/Encoding.h"
#include "nsIOutputStream.h"
#include "nsIDOMElement.h"
#include "nsIDOMNodeList.h"
#include "nsRange.h"
#include "nsIDOMDocument.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsIScriptContext.h"
#include "nsIScriptGlobalObject.h"
#include "nsIScriptSecurityManager.h"
#include "mozilla/dom/Selection.h"
#include "nsISelectionPrivate.h"
#include "nsITransferable.h" // for kUnicodeMime
#include "nsContentUtils.h"
#include "nsElementTable.h"
#include "nsNodeUtils.h"
#include "nsUnicharUtils.h"
#include "nsReadableUtils.h"
#include "nsTArray.h"
#include "nsIFrame.h"
#include "nsStringBuffer.h"
#include "mozilla/dom/Comment.h"
#include "mozilla/dom/DocumentType.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ProcessingInstruction.h"
#include "mozilla/dom/ShadowRoot.h"
#include "mozilla/dom/Text.h"
#include "nsLayoutUtils.h"
#include "mozilla/ScopeExit.h"
using namespace mozilla;
using namespace mozilla::dom;
enum nsRangeIterationDirection {
kDirectionOut = -1,
kDirectionIn = 1
};
class nsDocumentEncoder : public nsIDocumentEncoder
{
public:
nsDocumentEncoder();
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(nsDocumentEncoder)
NS_DECL_NSIDOCUMENTENCODER
protected:
virtual ~nsDocumentEncoder();
void Initialize(bool aClearCachedSerializer = true);
nsresult SerializeNodeStart(nsINode* aNode, int32_t aStartOffset,
int32_t aEndOffset, nsAString& aStr,
nsINode* aOriginalNode = nullptr);
nsresult SerializeToStringRecursive(nsINode* aNode,
nsAString& aStr,
bool aDontSerializeRoot,
uint32_t aMaxLength = 0);
nsresult SerializeNodeEnd(nsINode* aNode, nsAString& aStr);
// This serializes the content of aNode.
nsresult SerializeToStringIterative(nsINode* aNode,
nsAString& aStr);
nsresult SerializeRangeToString(nsRange *aRange,
nsAString& aOutputString);
nsresult SerializeRangeNodes(nsRange* aRange,
nsINode* aNode,
nsAString& aString,
int32_t aDepth);
nsresult SerializeRangeContextStart(const nsTArray<nsINode*>& aAncestorArray,
nsAString& aString);
nsresult SerializeRangeContextEnd(nsAString& aString);
virtual int32_t
GetImmediateContextCount(const nsTArray<nsINode*>& aAncestorArray)
{
return -1;
}
nsresult FlushText(nsAString& aString, bool aForce);
bool IsVisibleNode(nsINode* aNode)
{
NS_PRECONDITION(aNode, "");
if (mFlags & SkipInvisibleContent) {
// Treat the visibility of the ShadowRoot as if it were
// the host content.
nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
if (ShadowRoot* shadowRoot = ShadowRoot::FromNodeOrNull(content)) {
content = shadowRoot->GetHost();
}
if (content) {
nsIFrame* frame = content->GetPrimaryFrame();
if (!frame) {
if (aNode->IsNodeOfType(nsINode::eTEXT)) {
// We have already checked that our parent is visible.
return true;
}
if (aNode->IsHTMLElement(nsGkAtoms::rp)) {
// Ruby parentheses are part of ruby structure, hence
// shouldn't be stripped out even if it is not displayed.
return true;
}
return false;
}
bool isVisible = frame->StyleVisibility()->IsVisible();
if (!isVisible && aNode->IsNodeOfType(nsINode::eTEXT))
return false;
}
}
return true;
}
virtual bool IncludeInContext(nsINode *aNode);
void Clear();
class MOZ_STACK_CLASS AutoReleaseDocumentIfNeeded final
{
public:
explicit AutoReleaseDocumentIfNeeded(nsDocumentEncoder* aEncoder)
: mEncoder(aEncoder)
{
}
~AutoReleaseDocumentIfNeeded()
{
if (mEncoder->mFlags & RequiresReinitAfterOutput) {
mEncoder->Clear();
}
}
private:
nsDocumentEncoder* mEncoder;
};
nsCOMPtr<nsIDocument> mDocument;
RefPtr<Selection> mSelection;
RefPtr<nsRange> mRange;
nsCOMPtr<nsINode> mNode;
nsCOMPtr<nsIOutputStream> mStream;
nsCOMPtr<nsIContentSerializer> mSerializer;
UniquePtr<Encoder> mUnicodeEncoder;
nsCOMPtr<nsINode> mCommonParent;
nsCOMPtr<nsIDocumentEncoderNodeFixup> mNodeFixup;
nsString mMimeType;
const Encoding* mEncoding;
uint32_t mFlags;
uint32_t mWrapColumn;
uint32_t mStartDepth;
uint32_t mEndDepth;
int32_t mStartRootIndex;
int32_t mEndRootIndex;
AutoTArray<nsINode*, 8> mCommonAncestors;
AutoTArray<nsIContent*, 8> mStartNodes;
AutoTArray<int32_t, 8> mStartOffsets;
AutoTArray<nsIContent*, 8> mEndNodes;
AutoTArray<int32_t, 8> mEndOffsets;
AutoTArray<AutoTArray<nsINode*, 8>, 8> mRangeContexts;
// Whether the serializer cares about being notified to scan elements to
// keep track of whether they are preformatted. This stores the out
// argument of nsIContentSerializer::Init().
bool mNeedsPreformatScanning;
bool mHaltRangeHint;
// Used when context has already been serialized for
// table cell selections (where parent is <tr>)
bool mDisableContextSerialize;
bool mIsCopying; // Set to true only while copying
bool mNodeIsContainer;
bool mIsPlainText;
nsStringBuffer* mCachedBuffer;
};
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDocumentEncoder)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDocumentEncoder)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDocumentEncoder)
NS_INTERFACE_MAP_ENTRY(nsIDocumentEncoder)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION(nsDocumentEncoder,
mDocument, mSelection, mRange, mNode, mSerializer,
mCommonParent)
nsDocumentEncoder::nsDocumentEncoder()
: mEncoding(nullptr)
, mCachedBuffer(nullptr)
{
Initialize();
mMimeType.AssignLiteral("text/plain");
}
void nsDocumentEncoder::Initialize(bool aClearCachedSerializer)
{
mFlags = 0;
mWrapColumn = 72;
mStartDepth = 0;
mEndDepth = 0;
mStartRootIndex = 0;
mEndRootIndex = 0;
mNeedsPreformatScanning = false;
mHaltRangeHint = false;
mDisableContextSerialize = false;
mNodeIsContainer = false;
mIsPlainText = false;
if (aClearCachedSerializer) {
mSerializer = nullptr;
}
}
nsDocumentEncoder::~nsDocumentEncoder()
{
if (mCachedBuffer) {
mCachedBuffer->Release();
}
}
NS_IMETHODIMP
nsDocumentEncoder::Init(nsIDOMDocument* aDocument,
const nsAString& aMimeType,
uint32_t aFlags)
{
if (!aDocument)
return NS_ERROR_INVALID_ARG;
nsCOMPtr<nsIDocument> doc = do_QueryInterface(aDocument);
NS_ENSURE_TRUE(doc, NS_ERROR_FAILURE);
return NativeInit(doc, aMimeType, aFlags);
}
NS_IMETHODIMP
nsDocumentEncoder::NativeInit(nsIDocument* aDocument,
const nsAString& aMimeType,
uint32_t aFlags)
{
if (!aDocument)
return NS_ERROR_INVALID_ARG;
Initialize(!mMimeType.Equals(aMimeType));
mDocument = aDocument;
mMimeType = aMimeType;
mFlags = aFlags;
mIsCopying = false;
return NS_OK;
}
NS_IMETHODIMP
nsDocumentEncoder::SetWrapColumn(uint32_t aWC)
{
mWrapColumn = aWC;
return NS_OK;
}
NS_IMETHODIMP
nsDocumentEncoder::SetSelection(nsISelection* aSelection)
{
mSelection = aSelection->AsSelection();
return NS_OK;
}
NS_IMETHODIMP
nsDocumentEncoder::SetRange(nsIDOMRange* aRange)
{
mRange = static_cast<nsRange*>(aRange);
return NS_OK;
}
NS_IMETHODIMP
nsDocumentEncoder::SetNode(nsIDOMNode* aNode)
{
mNodeIsContainer = false;
mNode = do_QueryInterface(aNode);
return NS_OK;
}
NS_IMETHODIMP
nsDocumentEncoder::SetNativeNode(nsINode* aNode)
{
mNodeIsContainer = false;
mNode = aNode;
return NS_OK;
}
NS_IMETHODIMP
nsDocumentEncoder::SetContainerNode(nsIDOMNode *aContainer)
{
mNodeIsContainer = true;
mNode = do_QueryInterface(aContainer);
return NS_OK;
}
NS_IMETHODIMP
nsDocumentEncoder::SetNativeContainerNode(nsINode* aContainer)
{
mNodeIsContainer = true;
mNode = aContainer;
return NS_OK;
}
NS_IMETHODIMP
nsDocumentEncoder::SetCharset(const nsACString& aCharset)
{
const Encoding* encoding = Encoding::ForLabel(aCharset);
if (!encoding) {
return NS_ERROR_UCONV_NOCONV;
}
mEncoding = encoding->OutputEncoding();
return NS_OK;
}
NS_IMETHODIMP
nsDocumentEncoder::GetMimeType(nsAString& aMimeType)
{
aMimeType = mMimeType;
return NS_OK;
}
bool
nsDocumentEncoder::IncludeInContext(nsINode *aNode)
{
return false;
}
nsresult
nsDocumentEncoder::SerializeNodeStart(nsINode* aNode,
int32_t aStartOffset,
int32_t aEndOffset,
nsAString& aStr,
nsINode* aOriginalNode)
{
if (mNeedsPreformatScanning && aNode->IsElement()) {
mSerializer->ScanElementForPreformat(aNode->AsElement());
}
if (!IsVisibleNode(aNode))
return NS_OK;
nsINode* node = nullptr;
nsCOMPtr<nsINode> fixedNodeKungfuDeathGrip;
// Caller didn't do fixup, so we'll do it ourselves
if (!aOriginalNode) {
aOriginalNode = aNode;
if (mNodeFixup) {
bool dummy;
nsCOMPtr<nsIDOMNode> domNodeIn = do_QueryInterface(aNode);
nsCOMPtr<nsIDOMNode> domNodeOut;
mNodeFixup->FixupNode(domNodeIn, &dummy, getter_AddRefs(domNodeOut));
fixedNodeKungfuDeathGrip = do_QueryInterface(domNodeOut);
node = fixedNodeKungfuDeathGrip;
}
}
// Either there was no fixed-up node,
// or the caller did fixup themselves and aNode is already fixed
if (!node)
node = aNode;
if (node->IsElement()) {
if ((mFlags & (nsIDocumentEncoder::OutputPreformatted |
nsIDocumentEncoder::OutputDropInvisibleBreak)) &&
nsLayoutUtils::IsInvisibleBreak(node)) {
return NS_OK;
}
Element* originalElement =
aOriginalNode && aOriginalNode->IsElement() ?
aOriginalNode->AsElement() : nullptr;
mSerializer->AppendElementStart(node->AsElement(),
originalElement, aStr);
return NS_OK;
}
switch (node->NodeType()) {
case nsINode::TEXT_NODE:
{
mSerializer->AppendText(static_cast<nsIContent*>(node),
aStartOffset, aEndOffset, aStr);
break;
}
case nsINode::CDATA_SECTION_NODE:
{
mSerializer->AppendCDATASection(static_cast<nsIContent*>(node),
aStartOffset, aEndOffset, aStr);
break;
}
case nsINode::PROCESSING_INSTRUCTION_NODE:
{
mSerializer->AppendProcessingInstruction(static_cast<ProcessingInstruction*>(node),
aStartOffset, aEndOffset, aStr);
break;
}
case nsINode::COMMENT_NODE:
{
mSerializer->AppendComment(static_cast<Comment*>(node),
aStartOffset, aEndOffset, aStr);
break;
}
case nsINode::DOCUMENT_TYPE_NODE:
{
mSerializer->AppendDoctype(static_cast<DocumentType*>(node), aStr);
break;
}
}
return NS_OK;
}
nsresult
nsDocumentEncoder::SerializeNodeEnd(nsINode* aNode,
nsAString& aStr)
{
if (mNeedsPreformatScanning && aNode->IsElement()) {
mSerializer->ForgetElementForPreformat(aNode->AsElement());
}
if (!IsVisibleNode(aNode))
return NS_OK;
if (aNode->IsElement()) {
mSerializer->AppendElementEnd(aNode->AsElement(), aStr);
}
return NS_OK;
}
nsresult
nsDocumentEncoder::SerializeToStringRecursive(nsINode* aNode,
nsAString& aStr,
bool aDontSerializeRoot,
uint32_t aMaxLength)
{
if (aMaxLength > 0 && aStr.Length() >= aMaxLength) {
return NS_OK;
}
if (!IsVisibleNode(aNode))
return NS_OK;
nsresult rv = NS_OK;
bool serializeClonedChildren = false;
nsINode* maybeFixedNode = nullptr;
// Keep the node from FixupNode alive.
nsCOMPtr<nsINode> fixedNodeKungfuDeathGrip;
if (mNodeFixup) {
nsCOMPtr<nsIDOMNode> domNodeIn = do_QueryInterface(aNode);
nsCOMPtr<nsIDOMNode> domNodeOut;
mNodeFixup->FixupNode(domNodeIn, &serializeClonedChildren, getter_AddRefs(domNodeOut));
fixedNodeKungfuDeathGrip = do_QueryInterface(domNodeOut);
maybeFixedNode = fixedNodeKungfuDeathGrip;
}
if (!maybeFixedNode)
maybeFixedNode = aNode;
if ((mFlags & SkipInvisibleContent) &&
!(mFlags & OutputNonTextContentAsPlaceholder)) {
if (aNode->IsContent()) {
if (nsIFrame* frame = aNode->AsContent()->GetPrimaryFrame()) {
if (!frame->IsSelectable(nullptr)) {
aDontSerializeRoot = true;
}
}
}
}
if (!aDontSerializeRoot) {
int32_t endOffset = -1;
if (aMaxLength > 0) {
MOZ_ASSERT(aMaxLength >= aStr.Length());
endOffset = aMaxLength - aStr.Length();
}
rv = SerializeNodeStart(maybeFixedNode, 0, endOffset, aStr, aNode);
NS_ENSURE_SUCCESS(rv, rv);
}
nsINode* node = serializeClonedChildren ? maybeFixedNode : aNode;
for (nsINode* child = nsNodeUtils::GetFirstChildOfTemplateOrNode(node);
child;
child = child->GetNextSibling()) {
rv = SerializeToStringRecursive(child, aStr, false, aMaxLength);
NS_ENSURE_SUCCESS(rv, rv);
}
if (!aDontSerializeRoot) {
rv = SerializeNodeEnd(maybeFixedNode, aStr);
NS_ENSURE_SUCCESS(rv, rv);
}
return FlushText(aStr, false);
}
nsresult
nsDocumentEncoder::SerializeToStringIterative(nsINode* aNode,
nsAString& aStr)
{
nsresult rv;
nsINode* node = nsNodeUtils::GetFirstChildOfTemplateOrNode(aNode);
while (node) {
nsINode* current = node;
rv = SerializeNodeStart(current, 0, -1, aStr, current);
NS_ENSURE_SUCCESS(rv, rv);
node = nsNodeUtils::GetFirstChildOfTemplateOrNode(current);
while (!node && current && current != aNode) {
rv = SerializeNodeEnd(current, aStr);
NS_ENSURE_SUCCESS(rv, rv);
// Check if we have siblings.
node = current->GetNextSibling();
if (!node) {
// Perhaps parent node has siblings.
current = current->GetParentNode();
// Handle template element. If the parent is a template's content,
// then adjust the parent to be the template element.
if (current && current != aNode &&
current->NodeType() == nsINode::DOCUMENT_FRAGMENT_NODE) {
DocumentFragment* frag = static_cast<DocumentFragment*>(current);
nsIContent* host = frag->GetHost();
if (host && host->IsHTMLElement(nsGkAtoms::_template)) {
current = host;
}
}
}
}
}
return NS_OK;
}
static nsresult
ConvertAndWrite(const nsAString& aString,
nsIOutputStream* aStream,
Encoder* aEncoder,
bool aIsPlainText)
{
NS_ENSURE_ARG_POINTER(aStream);
NS_ENSURE_ARG_POINTER(aEncoder);
if (!aString.Length()) {
return NS_OK;
}
uint8_t buffer[4096];
auto src = MakeSpan(aString);
auto bufferSpan = MakeSpan(buffer);
// Reserve space for terminator
auto dst = bufferSpan.To(bufferSpan.Length() - 1);
for (;;) {
uint32_t result;
size_t read;
size_t written;
bool hadErrors;
if (aIsPlainText) {
Tie(result, read, written) =
aEncoder->EncodeFromUTF16WithoutReplacement(src, dst, false);
if (result != kInputEmpty && result != kOutputFull) {
// There's always room for one byte in the case of
// an unmappable character, because otherwise
// we'd have gotten `kOutputFull`.
dst[written++] = '?';
}
} else {
Tie(result, read, written, hadErrors) =
aEncoder->EncodeFromUTF16(src, dst, false);
}
Unused << hadErrors;
src = src.From(read);
// Sadly, we still have test cases that implement nsIOutputStream in JS, so
// the buffer needs to be zero-terminated for XPConnect to do its thing.
// See bug 170416.
bufferSpan[written] = 0;
uint32_t streamWritten;
nsresult rv = aStream->Write(
reinterpret_cast<char*>(dst.Elements()), written, &streamWritten);
if (NS_FAILED(rv)) {
return rv;
}
if (result == kInputEmpty) {
return NS_OK;
}
}
}
nsresult
nsDocumentEncoder::FlushText(nsAString& aString, bool aForce)
{
if (!mStream)
return NS_OK;
nsresult rv = NS_OK;
if (aString.Length() > 1024 || aForce) {
rv = ConvertAndWrite(aString, mStream, mUnicodeEncoder.get(), mIsPlainText);
aString.Truncate();
}
return rv;
}
static bool IsTextNode(nsINode *aNode)
{
return aNode && aNode->IsNodeOfType(nsINode::eTEXT);
}
nsresult
nsDocumentEncoder::SerializeRangeNodes(nsRange* aRange,
nsINode* aNode,
nsAString& aString,
int32_t aDepth)
{
nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
NS_ENSURE_TRUE(content, NS_ERROR_FAILURE);
if (!IsVisibleNode(aNode))
return NS_OK;
nsresult rv = NS_OK;
// get start and end nodes for this recursion level
nsCOMPtr<nsIContent> startNode, endNode;
{
int32_t start = mStartRootIndex - aDepth;
if (start >= 0 && (uint32_t)start <= mStartNodes.Length())
startNode = mStartNodes[start];
int32_t end = mEndRootIndex - aDepth;
if (end >= 0 && (uint32_t)end <= mEndNodes.Length())
endNode = mEndNodes[end];
}
if (startNode != content && endNode != content)
{
// node is completely contained in range. Serialize the whole subtree
// rooted by this node.
rv = SerializeToStringRecursive(aNode, aString, false);
NS_ENSURE_SUCCESS(rv, rv);
}
else
{
// due to implementation it is impossible for text node to be both start and end of
// range. We would have handled that case without getting here.
//XXXsmaug What does this all mean?
if (IsTextNode(aNode))
{
if (startNode == content)
{
int32_t startOffset = aRange->StartOffset();
rv = SerializeNodeStart(aNode, startOffset, -1, aString);
NS_ENSURE_SUCCESS(rv, rv);
}
else
{
int32_t endOffset = aRange->EndOffset();
rv = SerializeNodeStart(aNode, 0, endOffset, aString);
NS_ENSURE_SUCCESS(rv, rv);
}
}
else
{
if (aNode != mCommonParent)
{
if (IncludeInContext(aNode))
{
// halt the incrementing of mStartDepth/mEndDepth. This is
// so paste client will include this node in paste.
mHaltRangeHint = true;
}
if ((startNode == content) && !mHaltRangeHint) mStartDepth++;
if ((endNode == content) && !mHaltRangeHint) mEndDepth++;
// serialize the start of this node
rv = SerializeNodeStart(aNode, 0, -1, aString);
NS_ENSURE_SUCCESS(rv, rv);
}
// do some calculations that will tell us which children of this
// node are in the range.
int32_t startOffset = 0, endOffset = -1;
if (startNode == content && mStartRootIndex >= aDepth)
startOffset = mStartOffsets[mStartRootIndex - aDepth];
if (endNode == content && mEndRootIndex >= aDepth)
endOffset = mEndOffsets[mEndRootIndex - aDepth];
// generated content will cause offset values of -1 to be returned.
uint32_t childCount = content->GetChildCount();
if (startOffset == -1) startOffset = 0;
if (endOffset == -1) endOffset = childCount;
else
{
// if we are at the "tip" of the selection, endOffset is fine.
// otherwise, we need to add one. This is because of the semantics
// of the offset list created by GetAncestorsAndOffsets(). The
// intermediate points on the list use the endOffset of the
// location of the ancestor, rather than just past it. So we need
// to add one here in order to include it in the children we serialize.
if (aNode != aRange->GetEndContainer())
{
endOffset++;
}
}
if (endOffset) {
// serialize the children of this node that are in the range
nsIContent* childAsNode = content->GetFirstChild();
int32_t j = 0;
for (; j < startOffset && childAsNode; ++j) {
childAsNode = childAsNode->GetNextSibling();
}
NS_ENSURE_TRUE(!!childAsNode, NS_ERROR_FAILURE);
MOZ_ASSERT(j == startOffset);
for (; childAsNode && j < endOffset; ++j)
{
if ((j==startOffset) || (j==endOffset-1)) {
rv = SerializeRangeNodes(aRange, childAsNode, aString, aDepth+1);
} else {
rv = SerializeToStringRecursive(childAsNode, aString, false);
}
NS_ENSURE_SUCCESS(rv, rv);
childAsNode = childAsNode->GetNextSibling();
}
}
// serialize the end of this node
if (aNode != mCommonParent)
{
rv = SerializeNodeEnd(aNode, aString);
NS_ENSURE_SUCCESS(rv, rv);
}
}
}
return NS_OK;
}
nsresult
nsDocumentEncoder::SerializeRangeContextStart(const nsTArray<nsINode*>& aAncestorArray,
nsAString& aString)
{
if (mDisableContextSerialize) {
return NS_OK;
}
AutoTArray<nsINode*, 8>* serializedContext = mRangeContexts.AppendElement();
int32_t i = aAncestorArray.Length(), j;
nsresult rv = NS_OK;
// currently only for table-related elements; see Bug 137450
j = GetImmediateContextCount(aAncestorArray);
while (i > 0) {
nsINode *node = aAncestorArray.ElementAt(--i);
if (!node)
break;
// Either a general inclusion or as immediate context
if (IncludeInContext(node) || i < j) {
rv = SerializeNodeStart(node, 0, -1, aString);
serializedContext->AppendElement(node);
if (NS_FAILED(rv))
break;
}
}
return rv;
}
nsresult
nsDocumentEncoder::SerializeRangeContextEnd(nsAString& aString)
{
if (mDisableContextSerialize) {
return NS_OK;
}
MOZ_RELEASE_ASSERT(!mRangeContexts.IsEmpty(), "Tried to end context without starting one.");
AutoTArray<nsINode*, 8>& serializedContext = mRangeContexts.LastElement();
nsresult rv = NS_OK;
for (nsINode* node : Reversed(serializedContext)) {
rv = SerializeNodeEnd(node, aString);
if (NS_FAILED(rv))
break;
}
mRangeContexts.RemoveLastElement();
return rv;
}
nsresult
nsDocumentEncoder::SerializeRangeToString(nsRange *aRange,
nsAString& aOutputString)
{
if (!aRange || aRange->Collapsed())
return NS_OK;
mCommonParent = aRange->GetCommonAncestor();
if (!mCommonParent)
return NS_OK;
nsINode* startContainer = aRange->GetStartContainer();
NS_ENSURE_TRUE(startContainer, NS_ERROR_FAILURE);
int32_t startOffset = aRange->StartOffset();
nsINode* endContainer = aRange->GetEndContainer();
NS_ENSURE_TRUE(endContainer, NS_ERROR_FAILURE);
int32_t endOffset = aRange->EndOffset();
mStartDepth = mEndDepth = 0;
mCommonAncestors.Clear();
mStartNodes.Clear();
mStartOffsets.Clear();
mEndNodes.Clear();
mEndOffsets.Clear();
nsContentUtils::GetAncestors(mCommonParent, mCommonAncestors);
nsCOMPtr<nsIDOMNode> sp = do_QueryInterface(startContainer);
nsContentUtils::GetAncestorsAndOffsets(sp, startOffset,
&mStartNodes, &mStartOffsets);
nsCOMPtr<nsIDOMNode> ep = do_QueryInterface(endContainer);
nsContentUtils::GetAncestorsAndOffsets(ep, endOffset,
&mEndNodes, &mEndOffsets);
nsCOMPtr<nsIContent> commonContent = do_QueryInterface(mCommonParent);
mStartRootIndex = mStartNodes.IndexOf(commonContent);
mEndRootIndex = mEndNodes.IndexOf(commonContent);
nsresult rv = NS_OK;
rv = SerializeRangeContextStart(mCommonAncestors, aOutputString);
NS_ENSURE_SUCCESS(rv, rv);
if (startContainer == endContainer && IsTextNode(startContainer)) {
if (mFlags & SkipInvisibleContent) {
// Check that the parent is visible if we don't a frame.
// IsVisibleNode() will do it when there's a frame.
nsCOMPtr<nsIContent> content = do_QueryInterface(startContainer);
if (content && !content->GetPrimaryFrame()) {
nsIContent* parent = content->GetParent();
if (!parent || !IsVisibleNode(parent))
return NS_OK;
}
}
rv = SerializeNodeStart(startContainer, startOffset, endOffset,
aOutputString);
NS_ENSURE_SUCCESS(rv, rv);
} else {
rv = SerializeRangeNodes(aRange, mCommonParent, aOutputString, 0);
NS_ENSURE_SUCCESS(rv, rv);
}
rv = SerializeRangeContextEnd(aOutputString);
NS_ENSURE_SUCCESS(rv, rv);
return rv;
}
void
nsDocumentEncoder::Clear()
{
mDocument = nullptr;
mSelection = nullptr;
mRange = nullptr;
mNode = nullptr;
mCommonParent = nullptr;
mNodeFixup = nullptr;
Initialize(false);
}
NS_IMETHODIMP
nsDocumentEncoder::EncodeToString(nsAString& aOutputString)
{
return EncodeToStringWithMaxLength(0, aOutputString);
}
static bool ParentIsTR(nsIContent* aContent) {
mozilla::dom::Element* parent = aContent->GetParentElement();
if (!parent) {
return false;
}
return parent->IsHTMLElement(nsGkAtoms::tr);
}
NS_IMETHODIMP
nsDocumentEncoder::EncodeToStringWithMaxLength(uint32_t aMaxLength,
nsAString& aOutputString)
{
MOZ_ASSERT(mRangeContexts.IsEmpty(), "Re-entrant call to nsDocumentEncoder.");
auto rangeContextGuard = MakeScopeExit([&] {
mRangeContexts.Clear();
});
if (!mDocument)
return NS_ERROR_NOT_INITIALIZED;
AutoReleaseDocumentIfNeeded autoReleaseDocument(this);
aOutputString.Truncate();
nsString output;
static const size_t bufferSize = 2048;
if (!mCachedBuffer) {
mCachedBuffer = nsStringBuffer::Alloc(bufferSize).take();
if (NS_WARN_IF(!mCachedBuffer)) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
NS_ASSERTION(!mCachedBuffer->IsReadonly(),
"DocumentEncoder shouldn't keep reference to non-readonly buffer!");
static_cast<char16_t*>(mCachedBuffer->Data())[0] = char16_t(0);
mCachedBuffer->ToString(0, output, true);
// output owns the buffer now!
mCachedBuffer = nullptr;
if (!mSerializer) {
nsAutoCString progId(NS_CONTENTSERIALIZER_CONTRACTID_PREFIX);
AppendUTF16toUTF8(mMimeType, progId);
mSerializer = do_CreateInstance(progId.get());
NS_ENSURE_TRUE(mSerializer, NS_ERROR_NOT_IMPLEMENTED);
}
nsresult rv = NS_OK;
bool rewriteEncodingDeclaration = !(mSelection || mRange || mNode) && !(mFlags & OutputDontRewriteEncodingDeclaration);
mSerializer->Init(
mFlags, mWrapColumn, mEncoding, mIsCopying, rewriteEncodingDeclaration, &mNeedsPreformatScanning);
if (mSelection) {
uint32_t count = mSelection->RangeCount();
nsCOMPtr<nsINode> node, prevNode;
uint32_t firstRangeStartDepth = 0;
for (uint32_t i = 0; i < count; ++i) {
RefPtr<nsRange> range = mSelection->GetRangeAt(i);
// Bug 236546: newlines not added when copying table cells into clipboard
// Each selected cell shows up as a range containing a row with a single cell
// get the row, compare it to previous row and emit </tr><tr> as needed
// Bug 137450: Problem copying/pasting a table from a web page to Excel.
// Each separate block of <tr></tr> produced above will be wrapped by the
// immediate context. This assumes that you can't select cells that are
// multiple selections from two tables simultaneously.
node = range->GetStartContainer();
NS_ENSURE_TRUE(node, NS_ERROR_FAILURE);
if (node != prevNode) {
if (prevNode) {
rv = SerializeNodeEnd(prevNode, output);
NS_ENSURE_SUCCESS(rv, rv);
}
nsCOMPtr<nsIContent> content = do_QueryInterface(node);
if (content && content->IsHTMLElement(nsGkAtoms::tr) && !ParentIsTR(content)) {
if (!prevNode) {
// Went from a non-<tr> to a <tr>
mCommonAncestors.Clear();
nsContentUtils::GetAncestors(node->GetParentNode(),
mCommonAncestors);
rv = SerializeRangeContextStart(mCommonAncestors, output);
NS_ENSURE_SUCCESS(rv, rv);
// Don't let SerializeRangeToString serialize the context again
mDisableContextSerialize = true;
}
rv = SerializeNodeStart(node, 0, -1, output);
NS_ENSURE_SUCCESS(rv, rv);
prevNode = node;
} else if (prevNode) {
// Went from a <tr> to a non-<tr>
mDisableContextSerialize = false;
rv = SerializeRangeContextEnd(output);
NS_ENSURE_SUCCESS(rv, rv);
prevNode = nullptr;
}
}
rv = SerializeRangeToString(range, output);
NS_ENSURE_SUCCESS(rv, rv);
if (i == 0) {
firstRangeStartDepth = mStartDepth;
}
}
mStartDepth = firstRangeStartDepth;
if (prevNode) {
rv = SerializeNodeEnd(prevNode, output);
NS_ENSURE_SUCCESS(rv, rv);
mDisableContextSerialize = false;
rv = SerializeRangeContextEnd(output);
NS_ENSURE_SUCCESS(rv, rv);
}
// Just to be safe
mDisableContextSerialize = false;
mSelection = nullptr;
} else if (mRange) {
rv = SerializeRangeToString(mRange, output);
mRange = nullptr;
} else if (mNode) {
if (!mNodeFixup && !(mFlags & SkipInvisibleContent) && !mStream &&
mNodeIsContainer) {
rv = SerializeToStringIterative(mNode, output);
} else {
rv = SerializeToStringRecursive(mNode, output, mNodeIsContainer);
}
mNode = nullptr;
} else {
rv = mSerializer->AppendDocumentStart(mDocument, output);
if (NS_SUCCEEDED(rv)) {
rv = SerializeToStringRecursive(mDocument, output, false, aMaxLength);
}
}
NS_ENSURE_SUCCESS(rv, rv);
rv = mSerializer->Flush(output);
mCachedBuffer = nsStringBuffer::FromString(output);
// We have to be careful how we set aOutputString, because we don't
// want it to end up sharing mCachedBuffer if we plan to reuse it.
bool setOutput = false;
// Try to cache the buffer.
if (mCachedBuffer) {
if (mCachedBuffer->StorageSize() == bufferSize &&
!mCachedBuffer->IsReadonly()) {
mCachedBuffer->AddRef();
} else {
if (NS_SUCCEEDED(rv)) {
mCachedBuffer->ToString(output.Length(), aOutputString);
setOutput = true;
}
mCachedBuffer = nullptr;
}
}
if (!setOutput && NS_SUCCEEDED(rv)) {
aOutputString.Append(output.get(), output.Length());
}
return rv;
}
NS_IMETHODIMP
nsDocumentEncoder::EncodeToStream(nsIOutputStream* aStream)
{
MOZ_ASSERT(mRangeContexts.IsEmpty(), "Re-entrant call to nsDocumentEncoder.");
auto rangeContextGuard = MakeScopeExit([&] {
mRangeContexts.Clear();
});
nsresult rv = NS_OK;
if (!mDocument)
return NS_ERROR_NOT_INITIALIZED;
if (!mEncoding) {
return NS_ERROR_UCONV_NOCONV;
}
mUnicodeEncoder = mEncoding->NewEncoder();
mIsPlainText = (mMimeType.LowerCaseEqualsLiteral("text/plain"));
mStream = aStream;
nsAutoString buf;
rv = EncodeToString(buf);
// Force a flush of the last chunk of data.
FlushText(buf, true);
mStream = nullptr;
mUnicodeEncoder = nullptr;
return rv;
}
NS_IMETHODIMP
nsDocumentEncoder::EncodeToStringWithContext(nsAString& aContextString,
nsAString& aInfoString,
nsAString& aEncodedString)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsDocumentEncoder::SetNodeFixup(nsIDocumentEncoderNodeFixup *aFixup)
{
mNodeFixup = aFixup;
return NS_OK;
}
nsresult NS_NewTextEncoder(nsIDocumentEncoder** aResult); // make mac compiler happy
nsresult
NS_NewTextEncoder(nsIDocumentEncoder** aResult)
{
*aResult = new nsDocumentEncoder;
NS_ADDREF(*aResult);
return NS_OK;
}
class nsHTMLCopyEncoder : public nsDocumentEncoder
{
public:
nsHTMLCopyEncoder();
virtual ~nsHTMLCopyEncoder();
NS_IMETHOD Init(nsIDOMDocument* aDocument, const nsAString& aMimeType, uint32_t aFlags) override;
// overridden methods from nsDocumentEncoder
NS_IMETHOD SetSelection(nsISelection* aSelection) override;
NS_IMETHOD EncodeToStringWithContext(nsAString& aContextString,
nsAString& aInfoString,
nsAString& aEncodedString) override;
NS_IMETHOD EncodeToString(nsAString& aOutputString) override;
protected:
enum Endpoint
{
kStart,
kEnd
};
nsresult PromoteRange(nsRange* inRange);
nsresult PromoteAncestorChain(nsCOMPtr<nsINode>* ioNode,
int32_t* ioStartOffset,
int32_t* ioEndOffset);
nsresult GetPromotedPoint(Endpoint aWhere, nsINode* aNode, int32_t aOffset,
nsCOMPtr<nsINode>* outNode, int32_t* outOffset, nsINode* aCommon);
nsCOMPtr<nsINode> GetChildAt(nsINode *aParent, int32_t aOffset);
bool IsMozBR(nsIDOMNode* aNode);
bool IsMozBR(Element* aNode);
nsresult GetNodeLocation(nsINode *inChild, nsCOMPtr<nsINode> *outParent, int32_t *outOffset);
bool IsRoot(nsINode* aNode);
bool IsFirstNode(nsINode *aNode);
bool IsLastNode(nsINode *aNode);
bool IsEmptyTextContent(nsIDOMNode* aNode);
virtual bool IncludeInContext(nsINode *aNode) override;
virtual int32_t
GetImmediateContextCount(const nsTArray<nsINode*>& aAncestorArray) override;
bool mIsTextWidget;
};
nsHTMLCopyEncoder::nsHTMLCopyEncoder()
{
mIsTextWidget = false;
}
nsHTMLCopyEncoder::~nsHTMLCopyEncoder()
{
}
NS_IMETHODIMP
nsHTMLCopyEncoder::Init(nsIDOMDocument* aDocument,
const nsAString& aMimeType,
uint32_t aFlags)
{
if (!aDocument)
return NS_ERROR_INVALID_ARG;
mIsTextWidget = false;
Initialize();
mIsCopying = true;
mDocument = do_QueryInterface(aDocument);
NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
// Hack, hack! Traditionally, the caller passes text/unicode, which is
// treated as "guess text/html or text/plain" in this context. (It has a
// different meaning in other contexts. Sigh.) From now on, "text/plain"
// means forcing text/plain instead of guessing.
if (aMimeType.EqualsLiteral("text/plain")) {
mMimeType.AssignLiteral("text/plain");
} else {
mMimeType.AssignLiteral("text/html");
}
// Make all links absolute when copying
// (see related bugs #57296, #41924, #58646, #32768)
mFlags = aFlags | OutputAbsoluteLinks;
if (!mDocument->IsScriptEnabled())
mFlags |= OutputNoScriptContent;
return NS_OK;
}
NS_IMETHODIMP
nsHTMLCopyEncoder::SetSelection(nsISelection* aSelection)
{
// check for text widgets: we need to recognize these so that
// we don't tweak the selection to be outside of the magic
// div that ender-lite text widgets are embedded in.
if (!aSelection)
return NS_ERROR_NULL_POINTER;
Selection* selection = aSelection->AsSelection();
uint32_t rangeCount = selection->RangeCount();
// if selection is uninitialized return
if (!rangeCount) {
return NS_ERROR_FAILURE;
}
// we'll just use the common parent of the first range. Implicit assumption
// here that multi-range selections are table cell selections, in which case
// the common parent is somewhere in the table and we don't really care where.
RefPtr<nsRange> range = selection->GetRangeAt(0);
if (!range) {
// XXXbz can this happen given rangeCount > 0?
return NS_ERROR_NULL_POINTER;
}
nsINode* commonParent = range->GetCommonAncestor();
for (nsCOMPtr<nsIContent> selContent(do_QueryInterface(commonParent));
selContent;
selContent = selContent->GetParent())
{
// checking for selection inside a plaintext form widget
if (selContent->IsAnyOfHTMLElements(nsGkAtoms::input, nsGkAtoms::textarea))
{
mIsTextWidget = true;
break;
}
#if defined(MOZ_THUNDERBIRD) || defined(MOZ_SUITE)
else if (selContent->IsHTMLElement(nsGkAtoms::body)) {
// Currently, setting mIsTextWidget to 'true' will result in the selection
// being encoded/copied as pre-formatted plain text.
// This is fine for copying pre-formatted plain text with Firefox, it is
// already not correct for copying pre-formatted "rich" text (bold, colour)
// with Firefox. As long as the serialisers aren't fixed, copying
// pre-formatted text in Firefox is broken. If we set mIsTextWidget,
// pre-formatted plain text is copied, but pre-formatted "rich" text loses
// the "rich" formatting. If we don't set mIsTextWidget, "rich" text
// attributes aren't lost, but white-space is lost.
// So far the story for Firefox.
//
// Thunderbird has two *conflicting* requirements.
// Case 1:
// When selecting and copying text, even pre-formatted text, as a quote
// to be placed into a reply, we *always* expect HTML to be copied.
// Case 2:
// When copying text in a so-called "plain text" message, that is
// one where the body carries style "white-space:pre-wrap", the text should
// be copied as pre-formatted plain text.
//
// Therefore the following code checks for "pre-wrap" on the body.
// This is a terrible hack.
//
// The proper fix would be this:
// For case 1:
// Communicate the fact that HTML is required to EncodeToString(),
// bug 1141786.
// For case 2:
// Wait for Firefox to get fixed to detect pre-formatting correctly,
// bug 1174452.
nsAutoString styleVal;
if (selContent->IsElement() &&
selContent->AsElement()->GetAttr(kNameSpaceID_None, nsGkAtoms::style, styleVal) &&
styleVal.Find(NS_LITERAL_STRING("pre-wrap")) != kNotFound) {
mIsTextWidget = true;
break;
}
}
#endif
}
// normalize selection if we are not in a widget
if (mIsTextWidget)
{
mSelection = selection;
mMimeType.AssignLiteral("text/plain");
return NS_OK;
}
// XXX We should try to get rid of the Selection object here.
// XXX bug 1245883
// also consider ourselves in a text widget if we can't find an html document
nsCOMPtr<nsIHTMLDocument> htmlDoc = do_QueryInterface(mDocument);
if (!(htmlDoc && mDocument->IsHTMLDocument())) {
mIsTextWidget = true;
mSelection = selection;
// mMimeType is set to text/plain when encoding starts.
return NS_OK;
}
// there's no Clone() for selection! fix...
//nsresult rv = aSelection->Clone(getter_AddRefs(mSelection);
//NS_ENSURE_SUCCESS(rv, rv);
mSelection = new Selection();
// loop thru the ranges in the selection
for (uint32_t rangeIdx = 0; rangeIdx < rangeCount; ++rangeIdx) {
range = selection->GetRangeAt(rangeIdx);
NS_ENSURE_TRUE(range, NS_ERROR_FAILURE);
RefPtr<nsRange> myRange = range->CloneRange();
MOZ_ASSERT(myRange);
// adjust range to include any ancestors who's children are entirely selected
nsresult rv = PromoteRange(myRange);
NS_ENSURE_SUCCESS(rv, rv);
ErrorResult result;
mSelection->AddRangeInternal(*myRange, mDocument, result);
rv = result.StealNSResult();
NS_ENSURE_SUCCESS(rv, rv);
}
return NS_OK;
}
NS_IMETHODIMP
nsHTMLCopyEncoder::EncodeToString(nsAString& aOutputString)
{
if (mIsTextWidget) {
mMimeType.AssignLiteral("text/plain");
}
return nsDocumentEncoder::EncodeToString(aOutputString);
}
NS_IMETHODIMP
nsHTMLCopyEncoder::EncodeToStringWithContext(nsAString& aContextString,
nsAString& aInfoString,
nsAString& aEncodedString)
{
nsresult rv = EncodeToString(aEncodedString);
NS_ENSURE_SUCCESS(rv, rv);
// do not encode any context info or range hints if we are in a text widget.
if (mIsTextWidget) return NS_OK;
// now encode common ancestors into aContextString. Note that the common ancestors
// will be for the last range in the selection in the case of multirange selections.
// encoding ancestors every range in a multirange selection in a way that could be
// understood by the paste code would be a lot more work to do. As a practical matter,
// selections are single range, and the ones that aren't are table cell selections
// where all the cells are in the same table.
// leaf of ancestors might be text node. If so discard it.
int32_t count = mCommonAncestors.Length();
int32_t i;
nsCOMPtr<nsINode> node;
if (count > 0)
node = mCommonAncestors.ElementAt(0);
if (node && IsTextNode(node))
{
mCommonAncestors.RemoveElementAt(0);
// don't forget to adjust range depth info
if (mStartDepth) mStartDepth--;
if (mEndDepth) mEndDepth--;
// and the count
count--;
}
i = count;
while (i > 0)
{
node = mCommonAncestors.ElementAt(--i);
SerializeNodeStart(node, 0, -1, aContextString);
}
//i = 0; guaranteed by above
while (i < count)
{
node = mCommonAncestors.ElementAt(i++);
SerializeNodeEnd(node, aContextString);
}
// encode range info : the start and end depth of the selection, where the depth is
// distance down in the parent hierarchy. Later we will need to add leading/trailing
// whitespace info to this.
nsAutoString infoString;
infoString.AppendInt(mStartDepth);
infoString.Append(char16_t(','));
infoString.AppendInt(mEndDepth);
aInfoString = infoString;
return NS_OK;
}
bool
nsHTMLCopyEncoder::IncludeInContext(nsINode *aNode)
{
nsCOMPtr<nsIContent> content(do_QueryInterface(aNode));
if (!content)
return false;
return content->IsAnyOfHTMLElements(nsGkAtoms::b,
nsGkAtoms::i,
nsGkAtoms::u,
nsGkAtoms::a,
nsGkAtoms::tt,
nsGkAtoms::s,
nsGkAtoms::big,
nsGkAtoms::small,
nsGkAtoms::strike,
nsGkAtoms::em,
nsGkAtoms::strong,
nsGkAtoms::dfn,
nsGkAtoms::code,
nsGkAtoms::cite,
nsGkAtoms::var,
nsGkAtoms::abbr,
nsGkAtoms::font,
nsGkAtoms::script,
nsGkAtoms::span,
nsGkAtoms::pre,
nsGkAtoms::h1,
nsGkAtoms::h2,
nsGkAtoms::h3,
nsGkAtoms::h4,
nsGkAtoms::h5,
nsGkAtoms::h6);
}
nsresult
nsHTMLCopyEncoder::PromoteRange(nsRange* inRange)
{
if (!inRange->IsPositioned()) {
return NS_ERROR_UNEXPECTED;
}
nsCOMPtr<nsINode> startNode = inRange->GetStartContainer();
uint32_t startOffset = inRange->StartOffset();
nsCOMPtr<nsINode> endNode = inRange->GetEndContainer();
uint32_t endOffset = inRange->EndOffset();
nsCOMPtr<nsINode> common = inRange->GetCommonAncestor();
nsCOMPtr<nsINode> opStartNode;
nsCOMPtr<nsINode> opEndNode;
int32_t opStartOffset, opEndOffset;
// examine range endpoints.
nsresult rv =
GetPromotedPoint(kStart, startNode,
static_cast<int32_t>(startOffset),
address_of(opStartNode), &opStartOffset,
common);
NS_ENSURE_SUCCESS(rv, rv);
rv = GetPromotedPoint(kEnd, endNode,
static_cast<int32_t>(endOffset),
address_of(opEndNode), &opEndOffset,
common);
NS_ENSURE_SUCCESS(rv, rv);
// if both range endpoints are at the common ancestor, check for possible inclusion of ancestors
if (opStartNode == common && opEndNode == common) {
rv = PromoteAncestorChain(address_of(opStartNode), &opStartOffset, &opEndOffset);
NS_ENSURE_SUCCESS(rv, rv);
opEndNode = opStartNode;
}
// set the range to the new values
ErrorResult err;
inRange->SetStart(*opStartNode, static_cast<uint32_t>(opStartOffset), err);
if (NS_WARN_IF(err.Failed())) {
return err.StealNSResult();
}
inRange->SetEnd(*opEndNode, static_cast<uint32_t>(opEndOffset), err);
if (NS_WARN_IF(err.Failed())) {
return err.StealNSResult();
}
return NS_OK;
}
// PromoteAncestorChain will promote a range represented by [{*ioNode,*ioStartOffset} , {*ioNode,*ioEndOffset}]
// The promotion is different from that found in getPromotedPoint: it will only promote one endpoint if it can
// promote the other. Thus, instead of having a startnode/endNode, there is just the one ioNode.
nsresult
nsHTMLCopyEncoder::PromoteAncestorChain(nsCOMPtr<nsINode>* ioNode,
int32_t* ioStartOffset,
int32_t* ioEndOffset)
{
if (!ioNode || !ioStartOffset || !ioEndOffset) return NS_ERROR_NULL_POINTER;
nsresult rv = NS_OK;
bool done = false;
nsCOMPtr<nsINode> frontNode, endNode, parent;
int32_t frontOffset, endOffset;
//save the editable state of the ioNode, so we don't promote an ancestor if it has different editable state
nsCOMPtr<nsINode> node = *ioNode;
bool isEditable = node->IsEditable();
// loop for as long as we can promote both endpoints
while (!done)
{
node = *ioNode;
parent = node->GetParentNode();
if (!parent) {
done = true;
} else {
// passing parent as last param to GetPromotedPoint() allows it to promote only one level
// up the hierarchy.
rv = GetPromotedPoint( kStart, *ioNode, *ioStartOffset, address_of(frontNode), &frontOffset, parent);
NS_ENSURE_SUCCESS(rv, rv);
// then we make the same attempt with the endpoint
rv = GetPromotedPoint( kEnd, *ioNode, *ioEndOffset, address_of(endNode), &endOffset, parent);
NS_ENSURE_SUCCESS(rv, rv);
// if both endpoints were promoted one level and isEditable is the same as the original node,
// keep looping - otherwise we are done.
if ( (frontNode != parent) || (endNode != parent) || (frontNode->IsEditable() != isEditable) )
done = true;
else
{
*ioNode = frontNode;
*ioStartOffset = frontOffset;
*ioEndOffset = endOffset;
}
}
}
return rv;
}
nsresult
nsHTMLCopyEncoder::GetPromotedPoint(Endpoint aWhere, nsINode* aNode,
int32_t aOffset, nsCOMPtr<nsINode>* outNode,
int32_t* outOffset, nsINode* common)
{
nsresult rv = NS_OK;
nsCOMPtr<nsINode> node = aNode;
nsCOMPtr<nsINode> parent = aNode;
int32_t offset = aOffset;
bool bResetPromotion = false;
// default values
*outNode = node;
*outOffset = offset;
if (common == node)
return NS_OK;
if (aWhere == kStart)
{
// some special casing for text nodes
nsCOMPtr<nsINode> t = aNode;
if (auto nodeAsText = t->GetAsText())
{
// if not at beginning of text node, we are done
if (offset > 0)
{
// unless everything before us in just whitespace. NOTE: we need a more
// general solution that truly detects all cases of non-significant
// whitesace with no false alarms.
nsAutoString text;
nodeAsText->SubstringData(0, offset, text, IgnoreErrors());
text.CompressWhitespace();
if (!text.IsEmpty())
return NS_OK;
bResetPromotion = true;
}
// else
rv = GetNodeLocation(aNode, address_of(parent), &offset);
NS_ENSURE_SUCCESS(rv, rv);
}
else
{
node = GetChildAt(parent,offset);
}
if (!node) node = parent;
// finding the real start for this point. look up the tree for as long as we are the
// first node in the container, and as long as we haven't hit the body node.
if (!IsRoot(node) && (parent != common))
{
rv = GetNodeLocation(node, address_of(parent), &offset);
NS_ENSURE_SUCCESS(rv, rv);
if (offset == -1) return NS_OK; // we hit generated content; STOP
while ((IsFirstNode(node)) && (!IsRoot(parent)) && (parent != common))
{
if (bResetPromotion)
{
nsCOMPtr<nsIContent> content = do_QueryInterface(parent);
if (content && content->IsHTMLElement())
{
if (nsHTMLElement::IsBlock(nsHTMLTags::AtomTagToId(
content->NodeInfo()->NameAtom()))) {
bResetPromotion = false;
}
}
}
node = parent;
rv = GetNodeLocation(node, address_of(parent), &offset);
NS_ENSURE_SUCCESS(rv, rv);
if (offset == -1) // we hit generated content; STOP
{
// back up a bit
parent = node;
offset = 0;
break;
}
}
if (bResetPromotion)
{
*outNode = aNode;
*outOffset = aOffset;
}
else
{
*outNode = parent;
*outOffset = offset;
}
return rv;
}
}
if (aWhere == kEnd)
{
// some special casing for text nodes
nsCOMPtr<nsINode> n = do_QueryInterface(aNode);
if (auto nodeAsText = n->GetAsText())
{
// if not at end of text node, we are done
uint32_t len = n->Length();
if (offset < (int32_t)len)
{
// unless everything after us in just whitespace. NOTE: we need a more
// general solution that truly detects all cases of non-significant
// whitespace with no false alarms.
nsAutoString text;
nodeAsText->SubstringData(offset, len-offset, text, IgnoreErrors());
text.CompressWhitespace();
if (!text.IsEmpty())
return NS_OK;
bResetPromotion = true;
}
rv = GetNodeLocation(aNode, address_of(parent), &offset);
NS_ENSURE_SUCCESS(rv, rv);
}
else
{
if (offset) offset--; // we want node _before_ offset
node = GetChildAt(parent,offset);
}
if (!node) node = parent;
// finding the real end for this point. look up the tree for as long as we are the
// last node in the container, and as long as we haven't hit the body node.
if (!IsRoot(node) && (parent != common))
{
rv = GetNodeLocation(node, address_of(parent), &offset);
NS_ENSURE_SUCCESS(rv, rv);
if (offset == -1) return NS_OK; // we hit generated content; STOP
while ((IsLastNode(node)) && (!IsRoot(parent)) && (parent != common))
{
if (bResetPromotion)
{
nsCOMPtr<nsIContent> content = do_QueryInterface(parent);
if (content && content->IsHTMLElement())
{
if (nsHTMLElement::IsBlock(nsHTMLTags::AtomTagToId(
content->NodeInfo()->NameAtom()))) {
bResetPromotion = false;
}
}
}
node = parent;
rv = GetNodeLocation(node, address_of(parent), &offset);
NS_ENSURE_SUCCESS(rv, rv);
if (offset == -1) // we hit generated content; STOP
{
// back up a bit
parent = node;
offset = 0;
break;
}
}
if (bResetPromotion)
{
*outNode = aNode;
*outOffset = aOffset;
}
else
{
*outNode = parent;
offset++; // add one since this in an endpoint - want to be AFTER node.
*outOffset = offset;
}
return rv;
}
}
return rv;
}
nsCOMPtr<nsINode>
nsHTMLCopyEncoder::GetChildAt(nsINode *aParent, int32_t aOffset)
{
nsCOMPtr<nsINode> resultNode;
if (!aParent)
return resultNode;
nsCOMPtr<nsIContent> content = do_QueryInterface(aParent);
NS_PRECONDITION(content, "null content in nsHTMLCopyEncoder::GetChildAt");
resultNode = content->GetChildAt_Deprecated(aOffset);
return resultNode;
}
bool
nsHTMLCopyEncoder::IsMozBR(nsIDOMNode* aNode)
{
MOZ_ASSERT(aNode);
nsCOMPtr<Element> element = do_QueryInterface(aNode);
return element && IsMozBR(element);
}
bool
nsHTMLCopyEncoder::IsMozBR(Element* aElement)
{
return aElement->IsHTMLElement(nsGkAtoms::br) &&
aElement->AttrValueIs(kNameSpaceID_None, nsGkAtoms::type,
NS_LITERAL_STRING("_moz"), eIgnoreCase);
}
nsresult
nsHTMLCopyEncoder::GetNodeLocation(nsINode *inChild,
nsCOMPtr<nsINode> *outParent,
int32_t *outOffset)
{
NS_ASSERTION((inChild && outParent && outOffset), "bad args");
if (inChild && outParent && outOffset)
{
nsCOMPtr<nsIContent> child = do_QueryInterface(inChild);
if (!child) {
return NS_ERROR_NULL_POINTER;
}
nsIContent* parent = child->GetParent();
if (!parent) {
return NS_ERROR_NULL_POINTER;
}
*outParent = parent;
*outOffset = parent->ComputeIndexOf(child);
return NS_OK;
}
return NS_ERROR_NULL_POINTER;
}
bool
nsHTMLCopyEncoder::IsRoot(nsINode* aNode)
{
nsCOMPtr<nsIContent> content = do_QueryInterface(aNode);
if (!content) {
return false;
}
if (mIsTextWidget) {
return content->IsHTMLElement(nsGkAtoms::div);
}
return content->IsAnyOfHTMLElements(nsGkAtoms::body,
nsGkAtoms::td,
nsGkAtoms::th);
}
bool
nsHTMLCopyEncoder::IsFirstNode(nsINode *aNode)
{
// need to check if any nodes before us are really visible.
// Mike wrote something for me along these lines in nsSelectionController,
// but I don't think it's ready for use yet - revisit.
// HACK: for now, simply consider all whitespace text nodes to be
// invisible formatting nodes.
for (nsIContent* sibling = aNode->GetPreviousSibling();
sibling;
sibling = sibling->GetPreviousSibling()) {
if (!sibling->TextIsOnlyWhitespace()) {
return false;
}
}
return true;
}
bool
nsHTMLCopyEncoder::IsLastNode(nsINode *aNode)
{
// need to check if any nodes after us are really visible.
// Mike wrote something for me along these lines in nsSelectionController,
// but I don't think it's ready for use yet - revisit.
// HACK: for now, simply consider all whitespace text nodes to be
// invisible formatting nodes.
for (nsIContent* sibling = aNode->GetNextSibling();
sibling;
sibling = sibling->GetNextSibling()) {
if (sibling->IsElement() && IsMozBR(sibling->AsElement())) {
// we ignore trailing moz BRs.
continue;
}
if (!sibling->TextIsOnlyWhitespace()) {
return false;
}
}
return true;
}
bool
nsHTMLCopyEncoder::IsEmptyTextContent(nsIDOMNode* aNode)
{
nsCOMPtr<nsIContent> cont = do_QueryInterface(aNode);
return cont && cont->TextIsOnlyWhitespace();
}
nsresult NS_NewHTMLCopyTextEncoder(nsIDocumentEncoder** aResult); // make mac compiler happy
nsresult
NS_NewHTMLCopyTextEncoder(nsIDocumentEncoder** aResult)
{
*aResult = new nsHTMLCopyEncoder;
NS_ADDREF(*aResult);
return NS_OK;
}
int32_t
nsHTMLCopyEncoder::GetImmediateContextCount(const nsTArray<nsINode*>& aAncestorArray)
{
int32_t i = aAncestorArray.Length(), j = 0;
while (j < i) {
nsINode *node = aAncestorArray.ElementAt(j);
if (!node) {
break;
}
nsCOMPtr<nsIContent> content(do_QueryInterface(node));
if (!content ||
!content->IsAnyOfHTMLElements(nsGkAtoms::tr,
nsGkAtoms::thead,
nsGkAtoms::tbody,
nsGkAtoms::tfoot,
nsGkAtoms::table)) {
break;
}
++j;
}
return j;
}
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