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gecko-dev/dom/serializers/nsPlainTextSerializer.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/. */
/*
* nsIContentSerializer implementation that can be used with an
* nsIDocumentEncoder to convert a DOM into plaintext in a nice way
* (eg for copy/paste as plaintext).
*/
#include "nsPlainTextSerializer.h"
#include <limits>
#include "nsPrintfCString.h"
#include "nsDebug.h"
#include "nsGkAtoms.h"
#include "nsNameSpaceManager.h"
#include "nsTextFragment.h"
#include "nsContentUtils.h"
#include "nsReadableUtils.h"
#include "nsUnicharUtils.h"
#include "nsCRT.h"
#include "mozilla/Casting.h"
#include "mozilla/TextEditor.h"
#include "mozilla/dom/CharacterData.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLBRElement.h"
#include "mozilla/dom/Text.h"
#include "mozilla/intl/Segmenter.h"
#include "mozilla/intl/UnicodeProperties.h"
#include "nsUnicodeProperties.h"
#include "mozilla/Span.h"
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_converter.h"
#include "nsComputedDOMStyle.h"
namespace mozilla {
class Encoding;
}
using namespace mozilla;
using namespace mozilla::dom;
#define PREF_STRUCTS "converter.html2txt.structs"
#define PREF_HEADER_STRATEGY "converter.html2txt.header_strategy"
static const int32_t kTabSize = 4;
static const int32_t kIndentSizeHeaders =
2; /* Indention of h1, if
mHeaderStrategy = kIndentIncreasedWithHeaderLevel
or = kNumberHeadingsAndIndentSlightly. Indention of
other headers is derived from that. */
static const int32_t kIndentIncrementHeaders =
2; /* If mHeaderStrategy = kIndentIncreasedWithHeaderLevel,
indent h(x+1) this many
columns more than h(x) */
static const int32_t kIndentSizeList = kTabSize;
// Indention of non-first lines of ul and ol
static const int32_t kIndentSizeDD = kTabSize; // Indention of <dd>
static const char16_t kNBSP = 160;
static const char16_t kSPACE = ' ';
static int32_t HeaderLevel(const nsAtom* aTag);
static int32_t GetUnicharWidth(char32_t ucs);
static int32_t GetUnicharStringWidth(Span<const char16_t> aString);
// Someday may want to make this non-const:
static const uint32_t TagStackSize = 500;
NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPlainTextSerializer)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsPlainTextSerializer)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsPlainTextSerializer)
NS_INTERFACE_MAP_ENTRY(nsIContentSerializer)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION(nsPlainTextSerializer, mElement)
nsresult NS_NewPlainTextSerializer(nsIContentSerializer** aSerializer) {
RefPtr<nsPlainTextSerializer> it = new nsPlainTextSerializer();
it.forget(aSerializer);
return NS_OK;
}
// @param aFlags As defined in nsIDocumentEncoder.idl.
static void DetermineLineBreak(const int32_t aFlags, nsAString& aLineBreak) {
// Set the line break character:
if ((aFlags & nsIDocumentEncoder::OutputCRLineBreak) &&
(aFlags & nsIDocumentEncoder::OutputLFLineBreak)) {
// Windows
aLineBreak.AssignLiteral(u"\r\n");
} else if (aFlags & nsIDocumentEncoder::OutputCRLineBreak) {
// Mac
aLineBreak.AssignLiteral(u"\r");
} else if (aFlags & nsIDocumentEncoder::OutputLFLineBreak) {
// Unix/DOM
aLineBreak.AssignLiteral(u"\n");
} else {
// Platform/default
aLineBreak.AssignLiteral(NS_ULINEBREAK);
}
}
void nsPlainTextSerializer::CurrentLine::MaybeReplaceNbspsInContent(
const int32_t aFlags) {
// HTML editors may enforce consecutive spaces in HTML output by replacing
// them with non-breaking spaces.
// Here we revert this hack when converting HTML text to plain text.
if (!(aFlags & nsIDocumentEncoder::OutputPersistNBSP)) {
//
// Replace NBSP characters with spaces if they are adjacent to a space.
//
const uint32_t length = mContent.Length();
bool containsSpace = false;
bool containsNBSP = false;
// 1. Inspect the string forwards, and replace NBSPs that are **after**
// regular spaces.
//
// After that loop, all sequences of "spaceNBSP*" have been replaced by
// equally long "space*" sequences.
for (uint32_t i = 0; i < length; i++) {
if (mContent[i] == kSPACE) {
containsSpace = true;
} else if (mContent[i] == kNBSP) {
if (i > 0 && mContent[i - 1] == kSPACE) {
mContent.SetCharAt(kSPACE, i);
} else {
containsNBSP = true;
}
}
}
// 2. If we found spaces and didn't replace all relevant NBSPs, inpect the
// string backwards, and replace NBSPs that are **before** regular spaces.
//
// After that loop, all sequences of "NBSP*space" have been replaced by
// equally long "space*" sequences.
if (containsSpace && containsNBSP && length >= 1) {
for (uint32_t i = length - 1; i > 0; i--) {
if (mContent[i - 1] == kNBSP && mContent[i] == kSPACE) {
mContent.SetCharAt(kSPACE, i - 1);
}
}
}
}
}
void nsPlainTextSerializer::CurrentLine::ResetContentAndIndentationHeader() {
mContent.Truncate();
mIndentation.mHeader.Truncate();
}
int32_t nsPlainTextSerializer::CurrentLine::FindWrapIndexForContent(
const uint32_t aWrapColumn, bool aUseLineBreaker) const {
MOZ_ASSERT(!mContent.IsEmpty());
const uint32_t prefixwidth = DeterminePrefixWidth();
int32_t goodSpace = 0;
if (aUseLineBreaker) {
// We advance one line break point at a time from the beginning of the
// mContent until we find a width less than or equal to wrap column.
uint32_t width = 0;
intl::LineBreakIteratorUtf16 lineBreakIter(mContent);
while (const Maybe<uint32_t> nextGoodSpace = lineBreakIter.Next()) {
width += GetUnicharStringWidth(Span<const char16_t>(
mContent.get() + goodSpace, *nextGoodSpace - goodSpace));
if (prefixwidth + width > aWrapColumn) {
// The next break point makes the width exceeding the wrap column, so
// goodSpace is what we want.
break;
}
goodSpace = AssertedCast<int32_t>(*nextGoodSpace);
}
return goodSpace;
}
// In this case we don't want strings, especially CJK-ones, to be split. See
// bug 333064 for more information. We break only at ASCII spaces.
if (aWrapColumn >= prefixwidth) {
// Search backward from the adjusted wrap column or from the text end.
goodSpace =
std::min<int32_t>(aWrapColumn - prefixwidth, mContent.Length() - 1);
while (goodSpace >= 0) {
if (nsCRT::IsAsciiSpace(mContent.CharAt(goodSpace))) {
return goodSpace;
}
goodSpace--;
}
}
// Search forward from the adjusted wrap column.
goodSpace = (prefixwidth > aWrapColumn) ? 1 : aWrapColumn - prefixwidth;
const int32_t contentLength = mContent.Length();
while (goodSpace < contentLength &&
!nsCRT::IsAsciiSpace(mContent.CharAt(goodSpace))) {
goodSpace++;
}
return goodSpace;
}
nsPlainTextSerializer::OutputManager::OutputManager(const int32_t aFlags,
nsAString& aOutput)
: mFlags{aFlags}, mOutput{aOutput}, mAtFirstColumn{true} {
MOZ_ASSERT(aOutput.IsEmpty());
DetermineLineBreak(mFlags, mLineBreak);
}
void nsPlainTextSerializer::OutputManager::Append(
const CurrentLine& aCurrentLine,
const StripTrailingWhitespaces aStripTrailingWhitespaces) {
if (IsAtFirstColumn()) {
nsAutoString quotesAndIndent;
aCurrentLine.CreateQuotesAndIndent(quotesAndIndent);
if ((aStripTrailingWhitespaces == StripTrailingWhitespaces::kMaybe)) {
const bool stripTrailingSpaces = aCurrentLine.mContent.IsEmpty();
if (stripTrailingSpaces) {
quotesAndIndent.Trim(" ", false, true, false);
}
}
Append(quotesAndIndent);
}
Append(aCurrentLine.mContent);
}
void nsPlainTextSerializer::OutputManager::Append(const nsAString& aString) {
if (!aString.IsEmpty()) {
mOutput.Append(aString);
mAtFirstColumn = false;
}
}
void nsPlainTextSerializer::OutputManager::AppendLineBreak() {
mOutput.Append(mLineBreak);
mAtFirstColumn = true;
}
uint32_t nsPlainTextSerializer::OutputManager::GetOutputLength() const {
return mOutput.Length();
}
nsPlainTextSerializer::nsPlainTextSerializer()
: mFloatingLines(-1),
mLineBreakDue(false),
kSpace(u" "_ns) // Init of "constant"
{
mHeadLevel = 0;
mHasWrittenCiteBlockquote = false;
mSpanLevel = 0;
for (int32_t i = 0; i <= 6; i++) {
mHeaderCounter[i] = 0;
}
// Flow
mEmptyLines = 1; // The start of the document is an "empty line" in itself,
mInWhitespace = false;
mPreFormattedMail = false;
mPreformattedBlockBoundary = false;
// initialize the tag stack to zero:
// The stack only ever contains pointers to static atoms, so they don't
// need refcounting.
mTagStack = new const nsAtom*[TagStackSize];
mTagStackIndex = 0;
mIgnoreAboveIndex = (uint32_t)kNotFound;
mULCount = 0;
mIgnoredChildNodeLevel = 0;
}
nsPlainTextSerializer::~nsPlainTextSerializer() {
delete[] mTagStack;
NS_WARNING_ASSERTION(mHeadLevel == 0, "Wrong head level!");
}
nsPlainTextSerializer::Settings::HeaderStrategy
nsPlainTextSerializer::Settings::Convert(const int32_t aPrefHeaderStrategy) {
HeaderStrategy result{HeaderStrategy::kIndentIncreasedWithHeaderLevel};
switch (aPrefHeaderStrategy) {
case 0: {
result = HeaderStrategy::kNoIndentation;
break;
}
case 1: {
result = HeaderStrategy::kIndentIncreasedWithHeaderLevel;
break;
}
case 2: {
result = HeaderStrategy::kNumberHeadingsAndIndentSlightly;
break;
}
default: {
NS_WARNING(
nsPrintfCString("Header strategy pref contains undefined value: %i",
aPrefHeaderStrategy)
.get());
}
}
return result;
}
const int32_t kDefaultHeaderStrategy = 1;
void nsPlainTextSerializer::Settings::Init(const int32_t aFlags,
const uint32_t aWrapColumn) {
mFlags = aFlags;
if (mFlags & nsIDocumentEncoder::OutputFormatted) {
// Get some prefs that controls how we do formatted output
mStructs = Preferences::GetBool(PREF_STRUCTS, mStructs);
int32_t headerStrategy =
Preferences::GetInt(PREF_HEADER_STRATEGY, kDefaultHeaderStrategy);
mHeaderStrategy = Convert(headerStrategy);
}
mWithRubyAnnotation = StaticPrefs::converter_html2txt_always_include_ruby() ||
(mFlags & nsIDocumentEncoder::OutputRubyAnnotation);
// XXX We should let the caller decide whether to do this or not
mFlags &= ~nsIDocumentEncoder::OutputNoFramesContent;
mWrapColumn = aWrapColumn;
}
NS_IMETHODIMP
nsPlainTextSerializer::Init(const uint32_t aFlags, uint32_t aWrapColumn,
const Encoding* aEncoding, bool aIsCopying,
bool aIsWholeDocument,
bool* aNeedsPreformatScanning, nsAString& aOutput) {
#ifdef DEBUG
// Check if the major control flags are set correctly.
if (aFlags & nsIDocumentEncoder::OutputFormatFlowed) {
NS_ASSERTION(aFlags & nsIDocumentEncoder::OutputFormatted,
"If you want format=flowed, you must combine it with "
"nsIDocumentEncoder::OutputFormatted");
}
if (aFlags & nsIDocumentEncoder::OutputFormatted) {
NS_ASSERTION(
!(aFlags & nsIDocumentEncoder::OutputPreformatted),
"Can't do formatted and preformatted output at the same time!");
}
#endif
MOZ_ASSERT(!(aFlags & nsIDocumentEncoder::OutputFormatDelSp) ||
(aFlags & nsIDocumentEncoder::OutputFormatFlowed));
*aNeedsPreformatScanning = true;
mSettings.Init(aFlags, aWrapColumn);
mOutputManager.emplace(mSettings.GetFlags(), aOutput);
mUseLineBreaker = mSettings.MayWrap() && mSettings.MayBreakLines();
mLineBreakDue = false;
mFloatingLines = -1;
mPreformattedBlockBoundary = false;
MOZ_ASSERT(mOLStack.IsEmpty());
return NS_OK;
}
bool nsPlainTextSerializer::GetLastBool(const nsTArray<bool>& aStack) {
uint32_t size = aStack.Length();
if (size == 0) {
return false;
}
return aStack.ElementAt(size - 1);
}
void nsPlainTextSerializer::SetLastBool(nsTArray<bool>& aStack, bool aValue) {
uint32_t size = aStack.Length();
if (size > 0) {
aStack.ElementAt(size - 1) = aValue;
} else {
NS_ERROR("There is no \"Last\" value");
}
}
void nsPlainTextSerializer::PushBool(nsTArray<bool>& aStack, bool aValue) {
aStack.AppendElement(bool(aValue));
}
bool nsPlainTextSerializer::PopBool(nsTArray<bool>& aStack) {
return aStack.Length() ? aStack.PopLastElement() : false;
}
bool nsPlainTextSerializer::IsIgnorableRubyAnnotation(
const nsAtom* aTag) const {
if (mSettings.GetWithRubyAnnotation()) {
return false;
}
return aTag == nsGkAtoms::rp || aTag == nsGkAtoms::rt ||
aTag == nsGkAtoms::rtc;
}
// Return true if aElement has 'display:none' or if we just don't know.
static bool IsDisplayNone(Element* aElement) {
RefPtr<const ComputedStyle> computedStyle =
nsComputedDOMStyle::GetComputedStyleNoFlush(aElement);
return !computedStyle ||
computedStyle->StyleDisplay()->mDisplay == StyleDisplay::None;
}
static bool IsIgnorableScriptOrStyle(Element* aElement) {
return aElement->IsAnyOfHTMLElements(nsGkAtoms::script, nsGkAtoms::style) &&
IsDisplayNone(aElement);
}
NS_IMETHODIMP
nsPlainTextSerializer::AppendText(nsIContent* aText, int32_t aStartOffset,
int32_t aEndOffset) {
if (mIgnoreAboveIndex != (uint32_t)kNotFound) {
return NS_OK;
}
NS_ASSERTION(aStartOffset >= 0, "Negative start offset for text fragment!");
if (aStartOffset < 0) return NS_ERROR_INVALID_ARG;
NS_ENSURE_ARG(aText);
nsresult rv = NS_OK;
nsIContent* content = aText;
const nsTextFragment* frag;
if (!content || !(frag = content->GetText())) {
return NS_ERROR_FAILURE;
}
int32_t fragLength = frag->GetLength();
int32_t endoffset =
(aEndOffset == -1) ? fragLength : std::min(aEndOffset, fragLength);
NS_ASSERTION(aStartOffset <= endoffset,
"A start offset is beyond the end of the text fragment!");
int32_t length = endoffset - aStartOffset;
if (length <= 0) {
return NS_OK;
}
nsAutoString textstr;
if (frag->Is2b()) {
textstr.Assign(frag->Get2b() + aStartOffset, length);
} else {
// AssignASCII is for 7-bit character only, so don't use it
const char* data = frag->Get1b();
CopyASCIItoUTF16(Substring(data + aStartOffset, data + endoffset), textstr);
}
// Mask the text if the text node is in a password field.
if (content->HasFlag(NS_MAYBE_MASKED)) {
TextEditor::MaskString(textstr, *content->AsText(), 0, aStartOffset);
}
// We have to split the string across newlines
// to match parser behavior
int32_t start = 0;
int32_t offset = textstr.FindCharInSet(u"\n\r");
while (offset != kNotFound) {
if (offset > start) {
// Pass in the line
DoAddText(false, Substring(textstr, start, offset - start));
}
// Pass in a newline
DoAddText();
start = offset + 1;
offset = textstr.FindCharInSet(u"\n\r", start);
}
// Consume the last bit of the string if there's any left
if (start < length) {
if (start) {
DoAddText(false, Substring(textstr, start, length - start));
} else {
DoAddText(false, textstr);
}
}
return rv;
}
NS_IMETHODIMP
nsPlainTextSerializer::AppendCDATASection(nsIContent* aCDATASection,
int32_t aStartOffset,
int32_t aEndOffset) {
return AppendText(aCDATASection, aStartOffset, aEndOffset);
}
NS_IMETHODIMP
nsPlainTextSerializer::ScanElementForPreformat(Element* aElement) {
mPreformatStack.push(IsElementPreformatted(aElement));
return NS_OK;
}
NS_IMETHODIMP
nsPlainTextSerializer::ForgetElementForPreformat(Element* aElement) {
MOZ_RELEASE_ASSERT(!mPreformatStack.empty(),
"Tried to pop without previous push.");
mPreformatStack.pop();
return NS_OK;
}
NS_IMETHODIMP
nsPlainTextSerializer::AppendElementStart(Element* aElement,
Element* aOriginalElement) {
NS_ENSURE_ARG(aElement);
mElement = aElement;
nsresult rv;
nsAtom* id = GetIdForContent(mElement);
bool isContainer = !FragmentOrElement::IsHTMLVoid(id);
if (isContainer) {
rv = DoOpenContainer(id);
} else {
rv = DoAddLeaf(id);
}
mElement = nullptr;
if (id == nsGkAtoms::head) {
++mHeadLevel;
}
return rv;
}
NS_IMETHODIMP
nsPlainTextSerializer::AppendElementEnd(Element* aElement,
Element* aOriginalElement) {
NS_ENSURE_ARG(aElement);
mElement = aElement;
nsresult rv;
nsAtom* id = GetIdForContent(mElement);
bool isContainer = !FragmentOrElement::IsHTMLVoid(id);
rv = NS_OK;
if (isContainer) {
rv = DoCloseContainer(id);
}
mElement = nullptr;
if (id == nsGkAtoms::head) {
NS_ASSERTION(mHeadLevel != 0, "mHeadLevel being decremented below 0");
--mHeadLevel;
}
return rv;
}
NS_IMETHODIMP
nsPlainTextSerializer::FlushAndFinish() {
MOZ_ASSERT(mOutputManager);
mOutputManager->Flush(mCurrentLine);
return Finish();
}
NS_IMETHODIMP
nsPlainTextSerializer::Finish() {
mOutputManager.reset();
return NS_OK;
}
NS_IMETHODIMP
nsPlainTextSerializer::GetOutputLength(uint32_t& aLength) const {
MOZ_ASSERT(mOutputManager);
aLength = mOutputManager->GetOutputLength();
return NS_OK;
}
NS_IMETHODIMP
nsPlainTextSerializer::AppendDocumentStart(Document* aDocument) {
return NS_OK;
}
constexpr int32_t kOlStackDummyValue = 0;
nsresult nsPlainTextSerializer::DoOpenContainer(const nsAtom* aTag) {
if (IsIgnorableRubyAnnotation(aTag)) {
// Ignorable ruby annotation shouldn't be replaced by a placeholder
// character, neither any of its descendants.
mIgnoredChildNodeLevel++;
return NS_OK;
}
if (IsIgnorableScriptOrStyle(mElement)) {
mIgnoredChildNodeLevel++;
return NS_OK;
}
if (mSettings.HasFlag(nsIDocumentEncoder::OutputForPlainTextClipboardCopy)) {
if (mPreformattedBlockBoundary && DoOutput()) {
// Should always end a line, but get no more whitespace
if (mFloatingLines < 0) mFloatingLines = 0;
mLineBreakDue = true;
}
mPreformattedBlockBoundary = false;
}
if (mSettings.HasFlag(nsIDocumentEncoder::OutputRaw)) {
// Raw means raw. Don't even think about doing anything fancy
// here like indenting, adding line breaks or any other
// characters such as list item bullets, quote characters
// around <q>, etc.
return NS_OK;
}
if (mTagStackIndex < TagStackSize) {
mTagStack[mTagStackIndex++] = aTag;
}
if (mIgnoreAboveIndex != (uint32_t)kNotFound) {
return NS_OK;
}
// Reset this so that <blockquote type=cite> doesn't affect the whitespace
// above random <pre>s below it.
mHasWrittenCiteBlockquote =
mHasWrittenCiteBlockquote && aTag == nsGkAtoms::pre;
bool isInCiteBlockquote = false;
// XXX special-case <blockquote type=cite> so that we don't add additional
// newlines before the text.
if (aTag == nsGkAtoms::blockquote) {
nsAutoString value;
nsresult rv = GetAttributeValue(nsGkAtoms::type, value);
isInCiteBlockquote = NS_SUCCEEDED(rv) && value.EqualsIgnoreCase("cite");
}
if (mLineBreakDue && !isInCiteBlockquote) EnsureVerticalSpace(mFloatingLines);
// Check if this tag's content that should not be output
if ((aTag == nsGkAtoms::noscript &&
!mSettings.HasFlag(nsIDocumentEncoder::OutputNoScriptContent)) ||
((aTag == nsGkAtoms::iframe || aTag == nsGkAtoms::noframes) &&
!mSettings.HasFlag(nsIDocumentEncoder::OutputNoFramesContent))) {
// Ignore everything that follows the current tag in
// question until a matching end tag is encountered.
mIgnoreAboveIndex = mTagStackIndex - 1;
return NS_OK;
}
if (aTag == nsGkAtoms::body) {
// Try to figure out here whether we have a
// preformatted style attribute set by Thunderbird.
//
// Trigger on the presence of a "pre-wrap" in the
// style attribute. That's a very simplistic way to do
// it, but better than nothing.
nsAutoString style;
int32_t whitespace;
if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::style, style)) &&
(kNotFound != (whitespace = style.Find(u"white-space:")))) {
if (kNotFound != style.LowerCaseFindASCII("pre-wrap", whitespace)) {
#ifdef DEBUG_preformatted
printf("Set mPreFormattedMail based on style pre-wrap\n");
#endif
mPreFormattedMail = true;
} else if (kNotFound != style.LowerCaseFindASCII("pre", whitespace)) {
#ifdef DEBUG_preformatted
printf("Set mPreFormattedMail based on style pre\n");
#endif
mPreFormattedMail = true;
}
} else {
/* See comment at end of function. */
mInWhitespace = true;
mPreFormattedMail = false;
}
return NS_OK;
}
// Keep this in sync with DoCloseContainer!
if (!DoOutput()) {
return NS_OK;
}
if (aTag == nsGkAtoms::p)
EnsureVerticalSpace(1);
else if (aTag == nsGkAtoms::pre) {
if (GetLastBool(mIsInCiteBlockquote))
EnsureVerticalSpace(0);
else if (mHasWrittenCiteBlockquote) {
EnsureVerticalSpace(0);
mHasWrittenCiteBlockquote = false;
} else
EnsureVerticalSpace(1);
} else if (aTag == nsGkAtoms::tr) {
PushBool(mHasWrittenCellsForRow, false);
} else if (aTag == nsGkAtoms::td || aTag == nsGkAtoms::th) {
// We must make sure that the content of two table cells get a
// space between them.
// To make the separation between cells most obvious and
// importable, we use a TAB.
if (mHasWrittenCellsForRow.IsEmpty()) {
// We don't always see a <tr> (nor a <table>) before the <td> if we're
// copying part of a table
PushBool(mHasWrittenCellsForRow, true); // will never be popped
} else if (GetLastBool(mHasWrittenCellsForRow)) {
// Bypass |Write| so that the TAB isn't compressed away.
AddToLine(u"\t", 1);
mInWhitespace = true;
} else {
SetLastBool(mHasWrittenCellsForRow, true);
}
} else if (aTag == nsGkAtoms::ul) {
// Indent here to support nested lists, which aren't included in li :-(
EnsureVerticalSpace(IsInOlOrUl() ? 0 : 1);
// Must end the current line before we change indention
mCurrentLine.mIndentation.mLength += kIndentSizeList;
mULCount++;
} else if (aTag == nsGkAtoms::ol) {
EnsureVerticalSpace(IsInOlOrUl() ? 0 : 1);
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatted)) {
// Must end the current line before we change indention
nsAutoString startAttr;
int32_t startVal = 1;
if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::start, startAttr))) {
nsresult rv = NS_OK;
startVal = startAttr.ToInteger(&rv);
if (NS_FAILED(rv)) {
startVal = 1;
}
}
mOLStack.AppendElement(startVal);
} else {
mOLStack.AppendElement(kOlStackDummyValue);
}
mCurrentLine.mIndentation.mLength += kIndentSizeList; // see ul
} else if (aTag == nsGkAtoms::li &&
mSettings.HasFlag(nsIDocumentEncoder::OutputFormatted)) {
if (mTagStackIndex > 1 && IsInOL()) {
if (!mOLStack.IsEmpty()) {
nsAutoString valueAttr;
if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::value, valueAttr))) {
nsresult rv = NS_OK;
int32_t valueAttrVal = valueAttr.ToInteger(&rv);
if (NS_SUCCEEDED(rv)) {
mOLStack.LastElement() = valueAttrVal;
}
}
// This is what nsBulletFrame does for OLs:
mCurrentLine.mIndentation.mHeader.AppendInt(mOLStack.LastElement(), 10);
mOLStack.LastElement()++;
} else {
mCurrentLine.mIndentation.mHeader.Append(char16_t('#'));
}
mCurrentLine.mIndentation.mHeader.Append(char16_t('.'));
} else {
static const char bulletCharArray[] = "*o+#";
uint32_t index = mULCount > 0 ? (mULCount - 1) : 3;
char bulletChar = bulletCharArray[index % 4];
mCurrentLine.mIndentation.mHeader.Append(char16_t(bulletChar));
}
mCurrentLine.mIndentation.mHeader.Append(char16_t(' '));
} else if (aTag == nsGkAtoms::dl) {
EnsureVerticalSpace(1);
} else if (aTag == nsGkAtoms::dt) {
EnsureVerticalSpace(0);
} else if (aTag == nsGkAtoms::dd) {
EnsureVerticalSpace(0);
mCurrentLine.mIndentation.mLength += kIndentSizeDD;
} else if (aTag == nsGkAtoms::span) {
++mSpanLevel;
} else if (aTag == nsGkAtoms::blockquote) {
// Push
PushBool(mIsInCiteBlockquote, isInCiteBlockquote);
if (isInCiteBlockquote) {
EnsureVerticalSpace(0);
mCurrentLine.mCiteQuoteLevel++;
} else {
EnsureVerticalSpace(1);
mCurrentLine.mIndentation.mLength +=
kTabSize; // Check for some maximum value?
}
} else if (aTag == nsGkAtoms::q) {
Write(u"\""_ns);
}
// Else make sure we'll separate block level tags,
// even if we're about to leave, before doing any other formatting.
else if (IsCssBlockLevelElement(mElement)) {
EnsureVerticalSpace(0);
}
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatted)) {
OpenContainerForOutputFormatted(aTag);
}
return NS_OK;
}
void nsPlainTextSerializer::OpenContainerForOutputFormatted(
const nsAtom* aTag) {
const bool currentNodeIsConverted = IsCurrentNodeConverted();
if (aTag == nsGkAtoms::h1 || aTag == nsGkAtoms::h2 || aTag == nsGkAtoms::h3 ||
aTag == nsGkAtoms::h4 || aTag == nsGkAtoms::h5 || aTag == nsGkAtoms::h6) {
EnsureVerticalSpace(2);
if (mSettings.GetHeaderStrategy() ==
Settings::HeaderStrategy::kNumberHeadingsAndIndentSlightly) {
mCurrentLine.mIndentation.mLength += kIndentSizeHeaders;
// Caching
int32_t level = HeaderLevel(aTag);
// Increase counter for current level
mHeaderCounter[level]++;
// Reset all lower levels
int32_t i;
for (i = level + 1; i <= 6; i++) {
mHeaderCounter[i] = 0;
}
// Construct numbers
nsAutoString leadup;
for (i = 1; i <= level; i++) {
leadup.AppendInt(mHeaderCounter[i]);
leadup.Append(char16_t('.'));
}
leadup.Append(char16_t(' '));
Write(leadup);
} else if (mSettings.GetHeaderStrategy() ==
Settings::HeaderStrategy::kIndentIncreasedWithHeaderLevel) {
mCurrentLine.mIndentation.mLength += kIndentSizeHeaders;
for (int32_t i = HeaderLevel(aTag); i > 1; i--) {
// for h(x), run x-1 times
mCurrentLine.mIndentation.mLength += kIndentIncrementHeaders;
}
}
} else if (aTag == nsGkAtoms::sup && mSettings.GetStructs() &&
!currentNodeIsConverted) {
Write(u"^"_ns);
} else if (aTag == nsGkAtoms::sub && mSettings.GetStructs() &&
!currentNodeIsConverted) {
Write(u"_"_ns);
} else if (aTag == nsGkAtoms::code && mSettings.GetStructs() &&
!currentNodeIsConverted) {
Write(u"|"_ns);
} else if ((aTag == nsGkAtoms::strong || aTag == nsGkAtoms::b) &&
mSettings.GetStructs() && !currentNodeIsConverted) {
Write(u"*"_ns);
} else if ((aTag == nsGkAtoms::em || aTag == nsGkAtoms::i) &&
mSettings.GetStructs() && !currentNodeIsConverted) {
Write(u"/"_ns);
} else if (aTag == nsGkAtoms::u && mSettings.GetStructs() &&
!currentNodeIsConverted) {
Write(u"_"_ns);
}
/* Container elements are always block elements, so we shouldn't
output any whitespace immediately after the container tag even if
there's extra whitespace there because the HTML is pretty-printed
or something. To ensure that happens, tell the serializer we're
already in whitespace so it won't output more. */
mInWhitespace = true;
}
nsresult nsPlainTextSerializer::DoCloseContainer(const nsAtom* aTag) {
if (IsIgnorableRubyAnnotation(aTag)) {
mIgnoredChildNodeLevel--;
return NS_OK;
}
if (IsIgnorableScriptOrStyle(mElement)) {
mIgnoredChildNodeLevel--;
return NS_OK;
}
if (mSettings.HasFlag(nsIDocumentEncoder::OutputForPlainTextClipboardCopy)) {
if (DoOutput() && IsElementPreformatted() &&
IsCssBlockLevelElement(mElement)) {
// If we're closing a preformatted block element, output a line break
// when we find a new container.
mPreformattedBlockBoundary = true;
}
}
if (mSettings.HasFlag(nsIDocumentEncoder::OutputRaw)) {
// Raw means raw. Don't even think about doing anything fancy
// here like indenting, adding line breaks or any other
// characters such as list item bullets, quote characters
// around <q>, etc.
return NS_OK;
}
if (mTagStackIndex > 0) {
--mTagStackIndex;
}
if (mTagStackIndex >= mIgnoreAboveIndex) {
if (mTagStackIndex == mIgnoreAboveIndex) {
// We're dealing with the close tag whose matching
// open tag had set the mIgnoreAboveIndex value.
// Reset mIgnoreAboveIndex before discarding this tag.
mIgnoreAboveIndex = (uint32_t)kNotFound;
}
return NS_OK;
}
MOZ_ASSERT(mOutputManager);
// End current line if we're ending a block level tag
if ((aTag == nsGkAtoms::body) || (aTag == nsGkAtoms::html)) {
// We want the output to end with a new line,
// but in preformatted areas like text fields,
// we can't emit newlines that weren't there.
// So add the newline only in the case of formatted output.
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatted)) {
EnsureVerticalSpace(0);
} else {
mOutputManager->Flush(mCurrentLine);
}
// We won't want to do anything with these in formatted mode either,
// so just return now:
return NS_OK;
}
// Keep this in sync with DoOpenContainer!
if (!DoOutput()) {
return NS_OK;
}
if (aTag == nsGkAtoms::tr) {
PopBool(mHasWrittenCellsForRow);
// Should always end a line, but get no more whitespace
if (mFloatingLines < 0) mFloatingLines = 0;
mLineBreakDue = true;
} else if (((aTag == nsGkAtoms::li) || (aTag == nsGkAtoms::dt)) &&
mSettings.HasFlag(nsIDocumentEncoder::OutputFormatted)) {
// Items that should always end a line, but get no more whitespace
if (mFloatingLines < 0) mFloatingLines = 0;
mLineBreakDue = true;
} else if (aTag == nsGkAtoms::pre) {
mFloatingLines = GetLastBool(mIsInCiteBlockquote) ? 0 : 1;
mLineBreakDue = true;
} else if (aTag == nsGkAtoms::ul) {
mOutputManager->Flush(mCurrentLine);
mCurrentLine.mIndentation.mLength -= kIndentSizeList;
--mULCount;
if (!IsInOlOrUl()) {
mFloatingLines = 1;
mLineBreakDue = true;
}
} else if (aTag == nsGkAtoms::ol) {
mOutputManager->Flush(mCurrentLine); // Doing this after decreasing
// OLStackIndex would be wrong.
mCurrentLine.mIndentation.mLength -= kIndentSizeList;
MOZ_ASSERT(!mOLStack.IsEmpty(), "Wrong OLStack level!");
mOLStack.RemoveLastElement();
if (!IsInOlOrUl()) {
mFloatingLines = 1;
mLineBreakDue = true;
}
} else if (aTag == nsGkAtoms::dl) {
mFloatingLines = 1;
mLineBreakDue = true;
} else if (aTag == nsGkAtoms::dd) {
mOutputManager->Flush(mCurrentLine);
mCurrentLine.mIndentation.mLength -= kIndentSizeDD;
} else if (aTag == nsGkAtoms::span) {
NS_ASSERTION(mSpanLevel, "Span level will be negative!");
--mSpanLevel;
} else if (aTag == nsGkAtoms::div) {
if (mFloatingLines < 0) mFloatingLines = 0;
mLineBreakDue = true;
} else if (aTag == nsGkAtoms::blockquote) {
mOutputManager->Flush(mCurrentLine); // Is this needed?
// Pop
bool isInCiteBlockquote = PopBool(mIsInCiteBlockquote);
if (isInCiteBlockquote) {
NS_ASSERTION(mCurrentLine.mCiteQuoteLevel,
"CiteQuote level will be negative!");
mCurrentLine.mCiteQuoteLevel--;
mFloatingLines = 0;
mHasWrittenCiteBlockquote = true;
} else {
mCurrentLine.mIndentation.mLength -= kTabSize;
mFloatingLines = 1;
}
mLineBreakDue = true;
} else if (aTag == nsGkAtoms::q) {
Write(u"\""_ns);
} else if (IsCssBlockLevelElement(mElement)) {
// All other blocks get 1 vertical space after them
// in formatted mode, otherwise 0.
// This is hard. Sometimes 0 is a better number, but
// how to know?
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatted)) {
EnsureVerticalSpace(1);
} else {
if (mFloatingLines < 0) mFloatingLines = 0;
mLineBreakDue = true;
}
}
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatted)) {
CloseContainerForOutputFormatted(aTag);
}
return NS_OK;
}
void nsPlainTextSerializer::CloseContainerForOutputFormatted(
const nsAtom* aTag) {
const bool currentNodeIsConverted = IsCurrentNodeConverted();
if (aTag == nsGkAtoms::h1 || aTag == nsGkAtoms::h2 || aTag == nsGkAtoms::h3 ||
aTag == nsGkAtoms::h4 || aTag == nsGkAtoms::h5 || aTag == nsGkAtoms::h6) {
using HeaderStrategy = Settings::HeaderStrategy;
if ((mSettings.GetHeaderStrategy() ==
HeaderStrategy::kIndentIncreasedWithHeaderLevel) ||
(mSettings.GetHeaderStrategy() ==
HeaderStrategy::kNumberHeadingsAndIndentSlightly)) {
mCurrentLine.mIndentation.mLength -= kIndentSizeHeaders;
}
if (mSettings.GetHeaderStrategy() ==
HeaderStrategy::kIndentIncreasedWithHeaderLevel) {
for (int32_t i = HeaderLevel(aTag); i > 1; i--) {
// for h(x), run x-1 times
mCurrentLine.mIndentation.mLength -= kIndentIncrementHeaders;
}
}
EnsureVerticalSpace(1);
} else if (aTag == nsGkAtoms::a && !currentNodeIsConverted) {
nsAutoString url;
if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::href, url)) &&
!url.IsEmpty()) {
nsAutoString temp;
temp.AssignLiteral(" <");
temp += url;
temp.Append(char16_t('>'));
Write(temp);
}
} else if ((aTag == nsGkAtoms::sup || aTag == nsGkAtoms::sub) &&
mSettings.GetStructs() && !currentNodeIsConverted) {
Write(kSpace);
} else if (aTag == nsGkAtoms::code && mSettings.GetStructs() &&
!currentNodeIsConverted) {
Write(u"|"_ns);
} else if ((aTag == nsGkAtoms::strong || aTag == nsGkAtoms::b) &&
mSettings.GetStructs() && !currentNodeIsConverted) {
Write(u"*"_ns);
} else if ((aTag == nsGkAtoms::em || aTag == nsGkAtoms::i) &&
mSettings.GetStructs() && !currentNodeIsConverted) {
Write(u"/"_ns);
} else if (aTag == nsGkAtoms::u && mSettings.GetStructs() &&
!currentNodeIsConverted) {
Write(u"_"_ns);
}
}
bool nsPlainTextSerializer::MustSuppressLeaf() const {
if (mIgnoredChildNodeLevel > 0) {
return true;
}
if ((mTagStackIndex > 1 &&
mTagStack[mTagStackIndex - 2] == nsGkAtoms::select) ||
(mTagStackIndex > 0 &&
mTagStack[mTagStackIndex - 1] == nsGkAtoms::select)) {
// Don't output the contents of SELECT elements;
// Might be nice, eventually, to output just the selected element.
// Read more in bug 31994.
return true;
}
return false;
}
void nsPlainTextSerializer::DoAddText() { DoAddText(true, u""_ns); }
void nsPlainTextSerializer::DoAddText(bool aIsLineBreak,
const nsAString& aText) {
// If we don't want any output, just return
if (!DoOutput()) {
return;
}
if (!aIsLineBreak) {
// Make sure to reset this, since it's no longer true.
mHasWrittenCiteBlockquote = false;
}
if (mLineBreakDue) EnsureVerticalSpace(mFloatingLines);
if (MustSuppressLeaf()) {
return;
}
if (aIsLineBreak) {
// The only times we want to pass along whitespace from the original
// html source are if we're forced into preformatted mode via flags,
// or if we're prettyprinting and we're inside a <pre>.
// Otherwise, either we're collapsing to minimal text, or we're
// prettyprinting to mimic the html format, and in neither case
// does the formatting of the html source help us.
if (mSettings.HasFlag(nsIDocumentEncoder::OutputPreformatted) ||
(mPreFormattedMail && !mSettings.GetWrapColumn()) ||
IsElementPreformatted()) {
EnsureVerticalSpace(mEmptyLines + 1);
} else if (!mInWhitespace) {
Write(kSpace);
mInWhitespace = true;
}
return;
}
Write(aText);
}
void CreateLineOfDashes(nsAString& aResult, const uint32_t aWrapColumn) {
MOZ_ASSERT(aResult.IsEmpty());
const uint32_t width = (aWrapColumn > 0 ? aWrapColumn : 25);
while (aResult.Length() < width) {
aResult.Append(char16_t('-'));
}
}
nsresult nsPlainTextSerializer::DoAddLeaf(const nsAtom* aTag) {
mPreformattedBlockBoundary = false;
if (!DoOutput()) {
return NS_OK;
}
if (mLineBreakDue) EnsureVerticalSpace(mFloatingLines);
if (MustSuppressLeaf()) {
return NS_OK;
}
if (aTag == nsGkAtoms::br) {
// Another egregious editor workaround, see bug 38194:
// ignore the bogus br tags that the editor sticks here and there.
// FYI: `brElement` may be `nullptr` if the element is <br> element
// of non-HTML element.
// XXX Do we need to call `EnsureVerticalSpace()` when the <br> element
// is not an HTML element?
HTMLBRElement* brElement = HTMLBRElement::FromNodeOrNull(mElement);
if (!brElement || !brElement->IsPaddingForEmptyLastLine()) {
EnsureVerticalSpace(mEmptyLines + 1);
}
} else if (aTag == nsGkAtoms::hr &&
mSettings.HasFlag(nsIDocumentEncoder::OutputFormatted)) {
EnsureVerticalSpace(0);
// Make a line of dashes as wide as the wrap width
// XXX honoring percentage would be nice
nsAutoString line;
CreateLineOfDashes(line, mSettings.GetWrapColumn());
Write(line);
EnsureVerticalSpace(0);
} else if (aTag == nsGkAtoms::img) {
/* Output (in decreasing order of preference)
alt, title or nothing */
// See <http://www.w3.org/TR/REC-html40/struct/objects.html#edef-IMG>
nsAutoString imageDescription;
if (NS_SUCCEEDED(GetAttributeValue(nsGkAtoms::alt, imageDescription))) {
// If the alt attribute has an empty value (|alt=""|), output nothing
} else if (NS_SUCCEEDED(
GetAttributeValue(nsGkAtoms::title, imageDescription)) &&
!imageDescription.IsEmpty()) {
imageDescription = u" ["_ns + imageDescription + u"] "_ns;
}
Write(imageDescription);
}
return NS_OK;
}
/**
* Adds as many newline as necessary to get |aNumberOfRows| empty lines
*
* aNumberOfRows = -1 : Being in the middle of some line of text
* aNumberOfRows = 0 : Being at the start of a line
* aNumberOfRows = n>0 : Having n empty lines before the current line.
*/
void nsPlainTextSerializer::EnsureVerticalSpace(const int32_t aNumberOfRows) {
// If we have something in the indent we probably want to output
// it and it's not included in the count for empty lines so we don't
// realize that we should start a new line.
if (aNumberOfRows >= 0 && !mCurrentLine.mIndentation.mHeader.IsEmpty()) {
EndLine(false);
mInWhitespace = true;
}
while (mEmptyLines < aNumberOfRows) {
EndLine(false);
mInWhitespace = true;
}
mLineBreakDue = false;
mFloatingLines = -1;
}
void nsPlainTextSerializer::OutputManager::Flush(CurrentLine& aCurrentLine) {
if (!aCurrentLine.mContent.IsEmpty()) {
aCurrentLine.MaybeReplaceNbspsInContent(mFlags);
Append(aCurrentLine, StripTrailingWhitespaces::kNo);
aCurrentLine.ResetContentAndIndentationHeader();
}
}
static bool IsSpaceStuffable(const char16_t* s) {
return (s[0] == '>' || s[0] == ' ' || s[0] == kNBSP ||
NS_strncmp(s, u"From ", 5) == 0);
}
void nsPlainTextSerializer::MaybeWrapAndOutputCompleteLines() {
if (!mSettings.MayWrap()) {
return;
}
const uint32_t prefixwidth = mCurrentLine.DeterminePrefixWidth();
// Yes, wrap!
// The "+4" is to avoid wrap lines that only would be a couple
// of letters too long. We give this bonus only if the
// wrapcolumn is more than 20.
const uint32_t wrapColumn = mSettings.GetWrapColumn();
uint32_t bonuswidth = (wrapColumn > 20) ? 4 : 0;
while (!mCurrentLine.mContent.IsEmpty()) {
// The width of the line as it will appear on the screen (approx.).
const uint32_t currentLineContentWidth =
GetUnicharStringWidth(mCurrentLine.mContent);
if (currentLineContentWidth + prefixwidth <= wrapColumn + bonuswidth) {
break;
}
const int32_t goodSpace =
mCurrentLine.FindWrapIndexForContent(wrapColumn, mUseLineBreaker);
const int32_t contentLength = mCurrentLine.mContent.Length();
if ((goodSpace < contentLength) && (goodSpace > 0)) {
// Found a place to break
// -1 (trim a char at the break position)
// only if the line break was a space.
nsAutoString restOfContent;
if (nsCRT::IsAsciiSpace(mCurrentLine.mContent.CharAt(goodSpace))) {
mCurrentLine.mContent.Right(restOfContent,
contentLength - goodSpace - 1);
} else {
mCurrentLine.mContent.Right(restOfContent, contentLength - goodSpace);
}
// if breaker was U+0020, it has to consider for delsp=yes support
const bool breakBySpace = mCurrentLine.mContent.CharAt(goodSpace) == ' ';
mCurrentLine.mContent.Truncate(goodSpace);
EndLine(true, breakBySpace);
mCurrentLine.mContent.Truncate();
// Space stuff new line?
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatFlowed)) {
if (!restOfContent.IsEmpty() && IsSpaceStuffable(restOfContent.get()) &&
mCurrentLine.mCiteQuoteLevel ==
0 // We space-stuff quoted lines anyway
) {
// Space stuffing a la RFC 2646 (format=flowed).
mCurrentLine.mContent.Append(char16_t(' '));
// XXX doesn't seem to work correctly for ' '
}
}
mCurrentLine.mContent.Append(restOfContent);
mEmptyLines = -1;
} else {
// Nothing to do. Hopefully we get more data later
// to use for a place to break line
break;
}
}
}
/**
* This function adds a piece of text to the current stored line. If we are
* wrapping text and the stored line will become too long, a suitable
* location to wrap will be found and the line that's complete will be
* output.
*/
void nsPlainTextSerializer::AddToLine(const char16_t* aLineFragment,
int32_t aLineFragmentLength) {
if (mLineBreakDue) EnsureVerticalSpace(mFloatingLines);
if (mCurrentLine.mContent.IsEmpty()) {
if (0 == aLineFragmentLength) {
return;
}
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatFlowed)) {
if (IsSpaceStuffable(aLineFragment) &&
mCurrentLine.mCiteQuoteLevel ==
0 // We space-stuff quoted lines anyway
) {
// Space stuffing a la RFC 2646 (format=flowed).
mCurrentLine.mContent.Append(char16_t(' '));
}
}
mEmptyLines = -1;
}
mCurrentLine.mContent.Append(aLineFragment, aLineFragmentLength);
MaybeWrapAndOutputCompleteLines();
}
// The signature separator (RFC 2646).
const char kSignatureSeparator[] = "-- ";
// The OpenPGP dash-escaped signature separator in inline
// signed messages according to the OpenPGP standard (RFC 2440).
const char kDashEscapedSignatureSeparator[] = "- -- ";
static bool IsSignatureSeparator(const nsAString& aString) {
return aString.EqualsLiteral(kSignatureSeparator) ||
aString.EqualsLiteral(kDashEscapedSignatureSeparator);
}
/**
* Outputs the contents of mCurrentLine.mContent, and resets line
* specific variables. Also adds an indentation and prefix if there is one
* specified. Strips ending spaces from the line if it isn't preformatted.
*/
void nsPlainTextSerializer::EndLine(bool aSoftLineBreak, bool aBreakBySpace) {
if (aSoftLineBreak && mCurrentLine.mContent.IsEmpty()) {
// No meaning
return;
}
/* In non-preformatted mode, remove spaces from the end of the line for
* format=flowed compatibility. Don't do this for these special cases:
* "-- ", the signature separator (RFC 2646) shouldn't be touched and
* "- -- ", the OpenPGP dash-escaped signature separator in inline
* signed messages according to the OpenPGP standard (RFC 2440).
*/
if (!mSettings.HasFlag(nsIDocumentEncoder::OutputPreformatted) &&
(aSoftLineBreak || !IsSignatureSeparator(mCurrentLine.mContent))) {
mCurrentLine.mContent.Trim(" ", false, true, false);
}
if (aSoftLineBreak &&
mSettings.HasFlag(nsIDocumentEncoder::OutputFormatFlowed) &&
(mCurrentLine.mIndentation.mLength == 0)) {
// Add the soft part of the soft linebreak (RFC 2646 4.1)
// We only do this when there is no indentation since format=flowed
// lines and indentation doesn't work well together.
// If breaker character is ASCII space with RFC 3676 support (delsp=yes),
// add twice space.
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatDelSp) &&
aBreakBySpace) {
mCurrentLine.mContent.AppendLiteral(" ");
} else {
mCurrentLine.mContent.Append(char16_t(' '));
}
}
if (aSoftLineBreak) {
mEmptyLines = 0;
} else {
// Hard break
if (mCurrentLine.HasContentOrIndentationHeader()) {
mEmptyLines = 0;
} else {
mEmptyLines++;
}
}
MOZ_ASSERT(mOutputManager);
mCurrentLine.MaybeReplaceNbspsInContent(mSettings.GetFlags());
// If we don't have anything "real" to output we have to
// make sure the indent doesn't end in a space since that
// would trick a format=flowed-aware receiver.
mOutputManager->Append(mCurrentLine,
OutputManager::StripTrailingWhitespaces::kMaybe);
mOutputManager->AppendLineBreak();
mCurrentLine.ResetContentAndIndentationHeader();
mInWhitespace = true;
mLineBreakDue = false;
mFloatingLines = -1;
}
/**
* Creates the calculated and stored indent and text in the indentation. That is
* quote chars and numbers for numbered lists and such.
*/
void nsPlainTextSerializer::CurrentLine::CreateQuotesAndIndent(
nsAString& aResult) const {
// Put the mail quote "> " chars in, if appropriate:
if (mCiteQuoteLevel > 0) {
nsAutoString quotes;
for (int i = 0; i < mCiteQuoteLevel; i++) {
quotes.Append(char16_t('>'));
}
if (!mContent.IsEmpty()) {
/* Better don't output a space here, if the line is empty,
in case a receiving format=flowed-aware UA thinks, this were a flowed
line, which it isn't - it's just empty. (Flowed lines may be joined
with the following one, so the empty line may be lost completely.) */
quotes.Append(char16_t(' '));
}
aResult = quotes;
}
// Indent if necessary
int32_t indentwidth = mIndentation.mLength - mIndentation.mHeader.Length();
if (indentwidth > 0 && HasContentOrIndentationHeader()
// Don't make empty lines look flowed
) {
nsAutoString spaces;
for (int i = 0; i < indentwidth; ++i) spaces.Append(char16_t(' '));
aResult += spaces;
}
if (!mIndentation.mHeader.IsEmpty()) {
aResult += mIndentation.mHeader;
}
}
static bool IsLineFeedCarriageReturnBlankOrTab(char16_t c) {
return ('\n' == c || '\r' == c || ' ' == c || '\t' == c);
}
static void ReplaceVisiblyTrailingNbsps(nsAString& aString) {
const int32_t totLen = aString.Length();
for (int32_t i = totLen - 1; i >= 0; i--) {
char16_t c = aString[i];
if (IsLineFeedCarriageReturnBlankOrTab(c)) {
continue;
}
if (kNBSP == c) {
aString.Replace(i, 1, ' ');
} else {
break;
}
}
}
void nsPlainTextSerializer::ConvertToLinesAndOutput(const nsAString& aString) {
const int32_t totLen = aString.Length();
int32_t newline{0};
// Put the mail quote "> " chars in, if appropriate.
// Have to put it in before every line.
int32_t bol = 0;
while (bol < totLen) {
bool outputLineBreak = false;
bool spacesOnly = true;
// Find one of '\n' or '\r' using iterators since nsAString
// doesn't have the old FindCharInSet function.
nsAString::const_iterator iter;
aString.BeginReading(iter);
nsAString::const_iterator done_searching;
aString.EndReading(done_searching);
iter.advance(bol);
int32_t new_newline = bol;
newline = kNotFound;
while (iter != done_searching) {
if ('\n' == *iter || '\r' == *iter) {
newline = new_newline;
break;
}
if (' ' != *iter) {
spacesOnly = false;
}
++new_newline;
++iter;
}
// Done searching
nsAutoString stringpart;
if (newline == kNotFound) {
// No new lines.
stringpart.Assign(Substring(aString, bol, totLen - bol));
if (!stringpart.IsEmpty()) {
char16_t lastchar = stringpart.Last();
mInWhitespace = IsLineFeedCarriageReturnBlankOrTab(lastchar);
}
mEmptyLines = -1;
bol = totLen;
} else {
// There is a newline
stringpart.Assign(Substring(aString, bol, newline - bol));
mInWhitespace = true;
outputLineBreak = true;
mEmptyLines = 0;
bol = newline + 1;
if ('\r' == *iter && bol < totLen && '\n' == *++iter) {
// There was a CRLF in the input. This used to be illegal and
// stripped by the parser. Apparently not anymore. Let's skip
// over the LF.
bol++;
}
}
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatFlowed)) {
if ((outputLineBreak || !spacesOnly) && // bugs 261467,125928
!IsQuotedLine(stringpart) && !IsSignatureSeparator(stringpart)) {
stringpart.Trim(" ", false, true, true);
}
if (IsSpaceStuffable(stringpart.get()) && !IsQuotedLine(stringpart)) {
mCurrentLine.mContent.Append(char16_t(' '));
}
}
mCurrentLine.mContent.Append(stringpart);
mCurrentLine.MaybeReplaceNbspsInContent(mSettings.GetFlags());
mOutputManager->Append(mCurrentLine,
OutputManager::StripTrailingWhitespaces::kNo);
if (outputLineBreak) {
mOutputManager->AppendLineBreak();
}
mCurrentLine.ResetContentAndIndentationHeader();
}
#ifdef DEBUG_wrapping
printf("No wrapping: newline is %d, totLen is %d\n", newline, totLen);
#endif
}
/**
* Write a string. This is the highlevel function to use to get text output.
* By using AddToLine, Output, EndLine and other functions it handles quotation,
* line wrapping, indentation, whitespace compression and other things.
*/
void nsPlainTextSerializer::Write(const nsAString& aStr) {
// XXX Copy necessary to use nsString methods and gain
// access to underlying buffer
nsAutoString str(aStr);
#ifdef DEBUG_wrapping
printf("Write(%s): wrap col = %d\n", NS_ConvertUTF16toUTF8(str).get(),
mSettings.GetWrapColumn());
#endif
const int32_t totLen = str.Length();
// If the string is empty, do nothing:
if (totLen <= 0) return;
// For Flowed text change nbsp-ses to spaces at end of lines to allow them
// to be cut off along with usual spaces if required. (bug #125928)
if (mSettings.HasFlag(nsIDocumentEncoder::OutputFormatFlowed)) {
ReplaceVisiblyTrailingNbsps(str);
}
// We have two major codepaths here. One that does preformatted text and one
// that does normal formatted text. The one for preformatted text calls
// Output directly while the other code path goes through AddToLine.
if ((mPreFormattedMail && !mSettings.GetWrapColumn()) ||
(IsElementPreformatted() && !mPreFormattedMail) ||
(mSpanLevel > 0 && mEmptyLines >= 0 && IsQuotedLine(str))) {
// No intelligent wrapping.
// This mustn't be mixed with intelligent wrapping without clearing
// the mCurrentLine.mContent buffer before!!!
NS_ASSERTION(mCurrentLine.mContent.IsEmpty() ||
(IsElementPreformatted() && !mPreFormattedMail),
"Mixed wrapping data and nonwrapping data on the same line");
MOZ_ASSERT(mOutputManager);
if (!mCurrentLine.mContent.IsEmpty()) {
mOutputManager->Flush(mCurrentLine);
}
ConvertToLinesAndOutput(str);
return;
}
// Intelligent handling of text
// If needed, strip out all "end of lines"
// and multiple whitespace between words
int32_t nextpos;
const char16_t* offsetIntoBuffer = nullptr;
int32_t bol = 0;
while (bol < totLen) { // Loop over lines
// Find a place where we may have to do whitespace compression
nextpos = str.FindCharInSet(u" \t\n\r", bol);
#ifdef DEBUG_wrapping
nsAutoString remaining;
str.Right(remaining, totLen - bol);
foo = ToNewCString(remaining);
// printf("Next line: bol = %d, newlinepos = %d, totLen = %d, "
// "string = '%s'\n", bol, nextpos, totLen, foo);
free(foo);
#endif
if (nextpos == kNotFound) {
// The rest of the string
offsetIntoBuffer = str.get() + bol;
AddToLine(offsetIntoBuffer, totLen - bol);
bol = totLen;
mInWhitespace = false;
} else {
// There's still whitespace left in the string
if (nextpos != 0 && (nextpos + 1) < totLen) {
offsetIntoBuffer = str.get() + nextpos;
// skip '\n' if it is between CJ chars
if (offsetIntoBuffer[0] == '\n' && IS_CJ_CHAR(offsetIntoBuffer[-1]) &&
IS_CJ_CHAR(offsetIntoBuffer[1])) {
offsetIntoBuffer = str.get() + bol;
AddToLine(offsetIntoBuffer, nextpos - bol);
bol = nextpos + 1;
continue;
}
}
// If we're already in whitespace and not preformatted, just skip it:
if (mInWhitespace && (nextpos == bol) && !mPreFormattedMail &&
!mSettings.HasFlag(nsIDocumentEncoder::OutputPreformatted)) {
// Skip whitespace
bol++;
continue;
}
if (nextpos == bol) {
// Note that we are in whitespace.
mInWhitespace = true;
offsetIntoBuffer = str.get() + nextpos;
AddToLine(offsetIntoBuffer, 1);
bol++;
continue;
}
mInWhitespace = true;
offsetIntoBuffer = str.get() + bol;
if (mPreFormattedMail ||
mSettings.HasFlag(nsIDocumentEncoder::OutputPreformatted)) {
// Preserve the real whitespace character
nextpos++;
AddToLine(offsetIntoBuffer, nextpos - bol);
bol = nextpos;
} else {
// Replace the whitespace with a space
AddToLine(offsetIntoBuffer, nextpos - bol);
AddToLine(kSpace.get(), 1);
bol = nextpos + 1; // Let's eat the whitespace
}
}
} // Continue looping over the string
}
/**
* Gets the value of an attribute in a string. If the function returns
* NS_ERROR_NOT_AVAILABLE, there was none such attribute specified.
*/
nsresult nsPlainTextSerializer::GetAttributeValue(const nsAtom* aName,
nsString& aValueRet) const {
if (mElement) {
if (mElement->GetAttr(kNameSpaceID_None, aName, aValueRet)) {
return NS_OK;
}
}
return NS_ERROR_NOT_AVAILABLE;
}
/**
* Returns true, if the element was inserted by Moz' TXT->HTML converter.
* In this case, we should ignore it.
*/
bool nsPlainTextSerializer::IsCurrentNodeConverted() const {
nsAutoString value;
nsresult rv = GetAttributeValue(nsGkAtoms::_class, value);
return (NS_SUCCEEDED(rv) &&
(StringBeginsWith(value, u"moz-txt"_ns,
nsASCIICaseInsensitiveStringComparator) ||
StringBeginsWith(value, u"\"moz-txt"_ns,
nsASCIICaseInsensitiveStringComparator)));
}
// static
nsAtom* nsPlainTextSerializer::GetIdForContent(nsIContent* aContent) {
if (!aContent->IsHTMLElement()) {
return nullptr;
}
nsAtom* localName = aContent->NodeInfo()->NameAtom();
return localName->IsStatic() ? localName : nullptr;
}
bool nsPlainTextSerializer::IsElementPreformatted() const {
return !mPreformatStack.empty() && mPreformatStack.top();
}
bool nsPlainTextSerializer::IsElementPreformatted(Element* aElement) {
RefPtr<const ComputedStyle> computedStyle =
nsComputedDOMStyle::GetComputedStyleNoFlush(aElement);
if (computedStyle) {
const nsStyleText* textStyle = computedStyle->StyleText();
return textStyle->WhiteSpaceOrNewlineIsSignificant();
}
// Fall back to looking at the tag, in case there is no style information.
return GetIdForContent(aElement) == nsGkAtoms::pre;
}
bool nsPlainTextSerializer::IsCssBlockLevelElement(Element* aElement) {
RefPtr<const ComputedStyle> computedStyle =
nsComputedDOMStyle::GetComputedStyleNoFlush(aElement);
if (computedStyle) {
const nsStyleDisplay* displayStyle = computedStyle->StyleDisplay();
return displayStyle->IsBlockOutsideStyle();
}
// Fall back to looking at the tag, in case there is no style information.
return nsContentUtils::IsHTMLBlockLevelElement(aElement);
}
/**
* This method is required only to identify LI's inside OL.
* Returns TRUE if we are inside an OL tag and FALSE otherwise.
*/
bool nsPlainTextSerializer::IsInOL() const {
int32_t i = mTagStackIndex;
while (--i >= 0) {
if (mTagStack[i] == nsGkAtoms::ol) return true;
if (mTagStack[i] == nsGkAtoms::ul) {
// If a UL is reached first, LI belongs the UL nested in OL.
return false;
}
}
// We may reach here for orphan LI's.
return false;
}
bool nsPlainTextSerializer::IsInOlOrUl() const {
return (mULCount > 0) || !mOLStack.IsEmpty();
}
/*
@return 0 = no header, 1 = h1, ..., 6 = h6
*/
int32_t HeaderLevel(const nsAtom* aTag) {
if (aTag == nsGkAtoms::h1) {
return 1;
}
if (aTag == nsGkAtoms::h2) {
return 2;
}
if (aTag == nsGkAtoms::h3) {
return 3;
}
if (aTag == nsGkAtoms::h4) {
return 4;
}
if (aTag == nsGkAtoms::h5) {
return 5;
}
if (aTag == nsGkAtoms::h6) {
return 6;
}
return 0;
}
/* These functions define the column width of an ISO 10646 character
* as follows:
*
* - The null character (U+0000) has a column width of 0.
*
* - Other C0/C1 control characters and DEL will lead to a return
* value of -1.
*
* - Non-spacing and enclosing combining characters (general
* category code Mn or Me in the Unicode database) have a
* column width of 0.
*
* - Spacing characters in the East Asian Wide (W) or East Asian
* FullWidth (F) category as defined in Unicode Technical
* Report #11 have a column width of 2.
*
* - All remaining characters (including all printable
* ISO 8859-1 and WGL4 characters, Unicode control characters,
* etc.) have a column width of 1.
*/
int32_t GetUnicharWidth(char32_t aCh) {
/* test for 8-bit control characters */
if (aCh == 0) {
return 0;
}
if (aCh < 32 || (aCh >= 0x7f && aCh < 0xa0)) {
return -1;
}
/* The first combining char in Unicode is U+0300 */
if (aCh < 0x0300) {
return 1;
}
auto gc = unicode::GetGeneralCategory(aCh);
if (gc == HB_UNICODE_GENERAL_CATEGORY_NON_SPACING_MARK ||
gc == HB_UNICODE_GENERAL_CATEGORY_ENCLOSING_MARK) {
return 0;
}
/* if we arrive here, ucs is not a combining or C0/C1 control character */
/* fast test for majority of non-wide scripts */
if (aCh < 0x1100) {
return 1;
}
return intl::UnicodeProperties::IsEastAsianWidthFW(aCh) ? 2 : 1;
}
int32_t GetUnicharStringWidth(Span<const char16_t> aString) {
int32_t width = 0;
for (auto iter = aString.begin(); iter != aString.end(); ++iter) {
char32_t c = *iter;
if (NS_IS_HIGH_SURROGATE(c) && (iter + 1) != aString.end() &&
NS_IS_LOW_SURROGATE(*(iter + 1))) {
c = SURROGATE_TO_UCS4(c, *++iter);
}
const int32_t w = GetUnicharWidth(c);
// Taking 1 as the width of non-printable character, for bug 94475.
width += (w < 0 ? 1 : w);
}
return width;
}
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