forked from mirrors/gecko-dev
577 lines
20 KiB
C++
577 lines
20 KiB
C++
/* -*- 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/. */
|
||
|
||
#include "nsLineBreaker.h"
|
||
#include "nsContentUtils.h"
|
||
#include "gfxTextRun.h" // for the gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_* values
|
||
#include "nsHyphenationManager.h"
|
||
#include "nsHyphenator.h"
|
||
#include "mozilla/AutoRestore.h"
|
||
#include "mozilla/gfx/2D.h"
|
||
#include "mozilla/intl/LineBreaker.h" // for LineBreaker::ComputeBreakPositions
|
||
#include "mozilla/intl/Locale.h"
|
||
#include "mozilla/intl/UnicodeProperties.h"
|
||
|
||
using mozilla::AutoRestore;
|
||
using mozilla::intl::LineBreaker;
|
||
using mozilla::intl::LineBreakRule;
|
||
using mozilla::intl::Locale;
|
||
using mozilla::intl::LocaleParser;
|
||
using mozilla::intl::UnicodeProperties;
|
||
using mozilla::intl::WordBreakRule;
|
||
|
||
nsLineBreaker::nsLineBreaker()
|
||
: mCurrentWordLanguage(nullptr),
|
||
mCurrentWordContainsMixedLang(false),
|
||
mCurrentWordContainsComplexChar(false),
|
||
mScriptIsChineseOrJapanese(false),
|
||
mAfterBreakableSpace(false),
|
||
mBreakHere(false),
|
||
mWordBreak(WordBreakRule::Normal),
|
||
mLineBreak(LineBreakRule::Auto),
|
||
mWordContinuation(false) {}
|
||
|
||
nsLineBreaker::~nsLineBreaker() {
|
||
NS_ASSERTION(mCurrentWord.Length() == 0,
|
||
"Should have Reset() before destruction!");
|
||
}
|
||
|
||
static void SetupCapitalization(const char16_t* aWord, uint32_t aLength,
|
||
bool* aCapitalization) {
|
||
// Capitalize the first alphanumeric character after a space or punctuation.
|
||
using mozilla::intl::GeneralCategory;
|
||
bool capitalizeNextChar = true;
|
||
for (uint32_t i = 0; i < aLength; ++i) {
|
||
uint32_t ch = aWord[i];
|
||
if (i + 1 < aLength && NS_IS_SURROGATE_PAIR(ch, aWord[i + 1])) {
|
||
ch = SURROGATE_TO_UCS4(ch, aWord[i + 1]);
|
||
}
|
||
auto category = UnicodeProperties::CharType(ch);
|
||
switch (category) {
|
||
case GeneralCategory::Uppercase_Letter:
|
||
case GeneralCategory::Lowercase_Letter:
|
||
case GeneralCategory::Titlecase_Letter:
|
||
case GeneralCategory::Modifier_Letter:
|
||
case GeneralCategory::Other_Letter:
|
||
case GeneralCategory::Decimal_Number:
|
||
case GeneralCategory::Letter_Number:
|
||
case GeneralCategory::Other_Number:
|
||
if (capitalizeNextChar) {
|
||
aCapitalization[i] = true;
|
||
capitalizeNextChar = false;
|
||
}
|
||
break;
|
||
case GeneralCategory::Space_Separator:
|
||
case GeneralCategory::Line_Separator:
|
||
case GeneralCategory::Paragraph_Separator:
|
||
case GeneralCategory::Dash_Punctuation:
|
||
case GeneralCategory::Initial_Punctuation:
|
||
/* These punctuation categories are excluded, for examples like
|
||
* "what colo[u]r" -> "What Colo[u]r?" (rather than "What Colo[U]R?")
|
||
* and
|
||
* "snake_case" -> "Snake_case" (to match word selection behavior)
|
||
case GeneralCategory::Open_Punctuation:
|
||
case GeneralCategory::Close_Punctuation:
|
||
case GeneralCategory::Connector_Punctuation:
|
||
*/
|
||
capitalizeNextChar = true;
|
||
break;
|
||
case GeneralCategory::Final_Punctuation:
|
||
/* Special-case: exclude Unicode single-close-quote/apostrophe,
|
||
for examples like "Lowe’s" etc. */
|
||
if (ch != 0x2019) {
|
||
capitalizeNextChar = true;
|
||
}
|
||
break;
|
||
case GeneralCategory::Other_Punctuation:
|
||
/* Special-case: exclude ASCII apostrophe, for "Lowe's" etc.,
|
||
and MIDDLE DOT, for Catalan "l·l". */
|
||
if (ch != '\'' && ch != 0x00B7) {
|
||
capitalizeNextChar = true;
|
||
}
|
||
break;
|
||
default:
|
||
break;
|
||
}
|
||
if (!IS_IN_BMP(ch)) {
|
||
++i;
|
||
}
|
||
}
|
||
}
|
||
|
||
nsresult nsLineBreaker::FlushCurrentWord() {
|
||
uint32_t length = mCurrentWord.Length();
|
||
AutoTArray<uint8_t, 4000> breakState;
|
||
if (!breakState.AppendElements(length, mozilla::fallible)) {
|
||
return NS_ERROR_OUT_OF_MEMORY;
|
||
}
|
||
|
||
if (mLineBreak == LineBreakRule::Anywhere) {
|
||
memset(breakState.Elements(),
|
||
gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NORMAL,
|
||
length * sizeof(uint8_t));
|
||
} else if (!mCurrentWordContainsComplexChar) {
|
||
// For break-strict set everything internal to "break", otherwise
|
||
// to "no break"!
|
||
memset(breakState.Elements(),
|
||
mWordBreak == WordBreakRule::BreakAll
|
||
? gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NORMAL
|
||
: gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE,
|
||
length * sizeof(uint8_t));
|
||
} else {
|
||
LineBreaker::ComputeBreakPositions(
|
||
mCurrentWord.Elements(), length, mWordBreak, mLineBreak,
|
||
mScriptIsChineseOrJapanese, breakState.Elements());
|
||
}
|
||
|
||
bool autoHyphenate = mCurrentWordLanguage && !mCurrentWordContainsMixedLang;
|
||
uint32_t i;
|
||
for (i = 0; autoHyphenate && i < mTextItems.Length(); ++i) {
|
||
TextItem* ti = &mTextItems[i];
|
||
if (!(ti->mFlags & BREAK_USE_AUTO_HYPHENATION)) {
|
||
autoHyphenate = false;
|
||
}
|
||
}
|
||
if (autoHyphenate) {
|
||
RefPtr<nsHyphenator> hyphenator =
|
||
nsHyphenationManager::Instance()->GetHyphenator(mCurrentWordLanguage);
|
||
if (hyphenator) {
|
||
FindHyphenationPoints(hyphenator, mCurrentWord.Elements(),
|
||
mCurrentWord.Elements() + length,
|
||
breakState.Elements());
|
||
}
|
||
}
|
||
|
||
nsTArray<bool> capitalizationState;
|
||
uint32_t offset = 0;
|
||
for (i = 0; i < mTextItems.Length(); ++i) {
|
||
TextItem* ti = &mTextItems[i];
|
||
NS_ASSERTION(ti->mLength > 0, "Zero length word contribution?");
|
||
|
||
if ((ti->mFlags & BREAK_SUPPRESS_INITIAL) && ti->mSinkOffset == 0) {
|
||
breakState[offset] = gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE;
|
||
}
|
||
if (ti->mFlags & BREAK_SUPPRESS_INSIDE) {
|
||
uint32_t exclude = ti->mSinkOffset == 0 ? 1 : 0;
|
||
memset(breakState.Elements() + offset + exclude,
|
||
gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE,
|
||
(ti->mLength - exclude) * sizeof(uint8_t));
|
||
}
|
||
|
||
// Don't set the break state for the first character of the word, because
|
||
// it was already set correctly earlier and we don't know what the true
|
||
// value should be.
|
||
uint32_t skipSet = i == 0 ? 1 : 0;
|
||
if (ti->mSink) {
|
||
ti->mSink->SetBreaks(ti->mSinkOffset + skipSet, ti->mLength - skipSet,
|
||
breakState.Elements() + offset + skipSet);
|
||
|
||
if (!mWordContinuation && (ti->mFlags & BREAK_NEED_CAPITALIZATION)) {
|
||
if (capitalizationState.Length() == 0) {
|
||
if (!capitalizationState.AppendElements(length, mozilla::fallible)) {
|
||
return NS_ERROR_OUT_OF_MEMORY;
|
||
}
|
||
memset(capitalizationState.Elements(), false, length * sizeof(bool));
|
||
SetupCapitalization(mCurrentWord.Elements(), length,
|
||
capitalizationState.Elements());
|
||
}
|
||
ti->mSink->SetCapitalization(ti->mSinkOffset, ti->mLength,
|
||
capitalizationState.Elements() + offset);
|
||
}
|
||
}
|
||
|
||
offset += ti->mLength;
|
||
}
|
||
|
||
mCurrentWord.Clear();
|
||
mTextItems.Clear();
|
||
mCurrentWordContainsComplexChar = false;
|
||
mCurrentWordContainsMixedLang = false;
|
||
mCurrentWordLanguage = nullptr;
|
||
mWordContinuation = false;
|
||
return NS_OK;
|
||
}
|
||
|
||
// If the aFlags parameter to AppendText has all these bits set,
|
||
// then we don't need to worry about finding break opportunities
|
||
// in the appended text.
|
||
#define NO_BREAKS_NEEDED_FLAGS \
|
||
(BREAK_SUPPRESS_INITIAL | BREAK_SUPPRESS_INSIDE | \
|
||
BREAK_SKIP_SETTING_NO_BREAKS)
|
||
|
||
nsresult nsLineBreaker::AppendText(nsAtom* aHyphenationLanguage,
|
||
const char16_t* aText, uint32_t aLength,
|
||
uint32_t aFlags, nsILineBreakSink* aSink) {
|
||
NS_ASSERTION(aLength > 0, "Appending empty text...");
|
||
|
||
uint32_t offset = 0;
|
||
|
||
// Continue the current word
|
||
if (mCurrentWord.Length() > 0) {
|
||
NS_ASSERTION(!mAfterBreakableSpace && !mBreakHere,
|
||
"These should not be set");
|
||
|
||
while (offset < aLength && !IsSpace(aText[offset])) {
|
||
mCurrentWord.AppendElement(aText[offset]);
|
||
if (!mCurrentWordContainsComplexChar && IsComplexChar(aText[offset])) {
|
||
mCurrentWordContainsComplexChar = true;
|
||
}
|
||
UpdateCurrentWordLanguage(aHyphenationLanguage);
|
||
++offset;
|
||
}
|
||
|
||
if (offset > 0) {
|
||
mTextItems.AppendElement(TextItem(aSink, 0, offset, aFlags));
|
||
}
|
||
|
||
if (offset == aLength) {
|
||
return NS_OK;
|
||
}
|
||
|
||
// We encountered whitespace, so we're done with this word
|
||
nsresult rv = FlushCurrentWord();
|
||
if (NS_FAILED(rv)) {
|
||
return rv;
|
||
}
|
||
}
|
||
|
||
AutoTArray<uint8_t, 4000> breakState;
|
||
if (aSink) {
|
||
if (!breakState.AppendElements(aLength, mozilla::fallible)) {
|
||
return NS_ERROR_OUT_OF_MEMORY;
|
||
}
|
||
}
|
||
|
||
bool noCapitalizationNeeded = true;
|
||
nsTArray<bool> capitalizationState;
|
||
if (aSink && (aFlags & BREAK_NEED_CAPITALIZATION)) {
|
||
if (!capitalizationState.AppendElements(aLength, mozilla::fallible)) {
|
||
return NS_ERROR_OUT_OF_MEMORY;
|
||
}
|
||
memset(capitalizationState.Elements(), false, aLength * sizeof(bool));
|
||
noCapitalizationNeeded = false;
|
||
}
|
||
|
||
uint32_t start = offset;
|
||
bool noBreaksNeeded =
|
||
!aSink || ((aFlags & NO_BREAKS_NEEDED_FLAGS) == NO_BREAKS_NEEDED_FLAGS &&
|
||
!mBreakHere && !mAfterBreakableSpace);
|
||
if (noBreaksNeeded && noCapitalizationNeeded) {
|
||
// Skip to the space before the last word, since either the break data
|
||
// here is not needed, or no breaks are set in the sink and there cannot
|
||
// be any breaks in this chunk; and we don't need to do word-initial
|
||
// capitalization. All we need is the context for the next chunk (if any).
|
||
offset = aLength;
|
||
while (offset > start) {
|
||
--offset;
|
||
if (IsSpace(aText[offset])) {
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
uint32_t wordStart = offset;
|
||
bool wordHasComplexChar = false;
|
||
|
||
RefPtr<nsHyphenator> hyphenator;
|
||
if ((aFlags & BREAK_USE_AUTO_HYPHENATION) &&
|
||
!(aFlags & BREAK_SUPPRESS_INSIDE) && aHyphenationLanguage) {
|
||
hyphenator =
|
||
nsHyphenationManager::Instance()->GetHyphenator(aHyphenationLanguage);
|
||
}
|
||
|
||
for (;;) {
|
||
char16_t ch = aText[offset];
|
||
bool isSpace = IsSpace(ch);
|
||
bool isBreakableSpace = isSpace && !(aFlags & BREAK_SUPPRESS_INSIDE);
|
||
|
||
if (aSink && !noBreaksNeeded) {
|
||
breakState[offset] =
|
||
mBreakHere || (mAfterBreakableSpace && !isBreakableSpace) ||
|
||
mWordBreak == WordBreakRule::BreakAll ||
|
||
mLineBreak == LineBreakRule::Anywhere
|
||
? gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NORMAL
|
||
: gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE;
|
||
}
|
||
mBreakHere = false;
|
||
mAfterBreakableSpace = isBreakableSpace;
|
||
|
||
if (isSpace || ch == '\n') {
|
||
if (offset > wordStart && aSink) {
|
||
if (!(aFlags & BREAK_SUPPRESS_INSIDE)) {
|
||
if (mLineBreak == LineBreakRule::Anywhere) {
|
||
memset(breakState.Elements() + wordStart,
|
||
gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NORMAL,
|
||
offset - wordStart);
|
||
} else if (wordHasComplexChar) {
|
||
// Save current start-of-word state because ComputeBreakPositions()
|
||
// will set it to false.
|
||
AutoRestore<uint8_t> saveWordStartBreakState(breakState[wordStart]);
|
||
LineBreaker::ComputeBreakPositions(
|
||
aText + wordStart, offset - wordStart, mWordBreak, mLineBreak,
|
||
mScriptIsChineseOrJapanese, breakState.Elements() + wordStart);
|
||
}
|
||
if (hyphenator) {
|
||
FindHyphenationPoints(hyphenator, aText + wordStart, aText + offset,
|
||
breakState.Elements() + wordStart);
|
||
}
|
||
}
|
||
if (!mWordContinuation && !noCapitalizationNeeded) {
|
||
SetupCapitalization(aText + wordStart, offset - wordStart,
|
||
capitalizationState.Elements() + wordStart);
|
||
}
|
||
}
|
||
wordHasComplexChar = false;
|
||
mWordContinuation = false;
|
||
++offset;
|
||
if (offset >= aLength) {
|
||
break;
|
||
}
|
||
wordStart = offset;
|
||
} else {
|
||
if (!wordHasComplexChar && IsComplexChar(ch)) {
|
||
wordHasComplexChar = true;
|
||
}
|
||
++offset;
|
||
if (offset >= aLength) {
|
||
// Save this word
|
||
mCurrentWordContainsComplexChar = wordHasComplexChar;
|
||
uint32_t len = offset - wordStart;
|
||
char16_t* elems = mCurrentWord.AppendElements(len);
|
||
if (!elems) {
|
||
return NS_ERROR_OUT_OF_MEMORY;
|
||
}
|
||
memcpy(elems, aText + wordStart, sizeof(char16_t) * len);
|
||
mTextItems.AppendElement(TextItem(aSink, wordStart, len, aFlags));
|
||
// Ensure that the break-before for this word is written out
|
||
offset = wordStart + 1;
|
||
UpdateCurrentWordLanguage(aHyphenationLanguage);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (aSink) {
|
||
if (!noBreaksNeeded) {
|
||
aSink->SetBreaks(start, offset - start, breakState.Elements() + start);
|
||
}
|
||
if (!noCapitalizationNeeded) {
|
||
aSink->SetCapitalization(start, offset - start,
|
||
capitalizationState.Elements() + start);
|
||
}
|
||
}
|
||
return NS_OK;
|
||
}
|
||
|
||
void nsLineBreaker::FindHyphenationPoints(nsHyphenator* aHyphenator,
|
||
const char16_t* aTextStart,
|
||
const char16_t* aTextLimit,
|
||
uint8_t* aBreakState) {
|
||
nsDependentSubstring string(aTextStart, aTextLimit);
|
||
AutoTArray<bool, 200> hyphens;
|
||
if (NS_SUCCEEDED(aHyphenator->Hyphenate(string, hyphens))) {
|
||
for (uint32_t i = 0; i + 1 < string.Length(); ++i) {
|
||
if (hyphens[i]) {
|
||
aBreakState[i + 1] =
|
||
gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_HYPHEN;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
nsresult nsLineBreaker::AppendText(nsAtom* aHyphenationLanguage,
|
||
const uint8_t* aText, uint32_t aLength,
|
||
uint32_t aFlags, nsILineBreakSink* aSink) {
|
||
NS_ASSERTION(aLength > 0, "Appending empty text...");
|
||
|
||
if (aFlags & (BREAK_NEED_CAPITALIZATION | BREAK_USE_AUTO_HYPHENATION)) {
|
||
// Defer to the Unicode path if capitalization or hyphenation is required
|
||
nsAutoString str;
|
||
const char* cp = reinterpret_cast<const char*>(aText);
|
||
CopyASCIItoUTF16(nsDependentCSubstring(cp, cp + aLength), str);
|
||
return AppendText(aHyphenationLanguage, str.get(), aLength, aFlags, aSink);
|
||
}
|
||
|
||
uint32_t offset = 0;
|
||
|
||
// Continue the current word
|
||
if (mCurrentWord.Length() > 0) {
|
||
NS_ASSERTION(!mAfterBreakableSpace && !mBreakHere,
|
||
"These should not be set");
|
||
|
||
while (offset < aLength && !IsSpace(aText[offset])) {
|
||
mCurrentWord.AppendElement(aText[offset]);
|
||
if (!mCurrentWordContainsComplexChar &&
|
||
IsComplexASCIIChar(aText[offset])) {
|
||
mCurrentWordContainsComplexChar = true;
|
||
}
|
||
++offset;
|
||
}
|
||
|
||
if (offset > 0) {
|
||
mTextItems.AppendElement(TextItem(aSink, 0, offset, aFlags));
|
||
}
|
||
|
||
if (offset == aLength) {
|
||
// We did not encounter whitespace so the word hasn't finished yet.
|
||
return NS_OK;
|
||
}
|
||
|
||
// We encountered whitespace, so we're done with this word
|
||
nsresult rv = FlushCurrentWord();
|
||
if (NS_FAILED(rv)) {
|
||
return rv;
|
||
}
|
||
}
|
||
|
||
AutoTArray<uint8_t, 4000> breakState;
|
||
if (aSink) {
|
||
if (!breakState.AppendElements(aLength, mozilla::fallible)) {
|
||
return NS_ERROR_OUT_OF_MEMORY;
|
||
}
|
||
}
|
||
|
||
uint32_t start = offset;
|
||
bool noBreaksNeeded =
|
||
!aSink || ((aFlags & NO_BREAKS_NEEDED_FLAGS) == NO_BREAKS_NEEDED_FLAGS &&
|
||
!mBreakHere && !mAfterBreakableSpace);
|
||
if (noBreaksNeeded) {
|
||
// Skip to the space before the last word, since either the break data
|
||
// here is not needed, or no breaks are set in the sink and there cannot
|
||
// be any breaks in this chunk; all we need is the context for the next
|
||
// chunk (if any)
|
||
offset = aLength;
|
||
while (offset > start) {
|
||
--offset;
|
||
if (IsSpace(aText[offset])) {
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
uint32_t wordStart = offset;
|
||
bool wordHasComplexChar = false;
|
||
|
||
for (;;) {
|
||
uint8_t ch = aText[offset];
|
||
bool isSpace = IsSpace(ch);
|
||
bool isBreakableSpace = isSpace && !(aFlags & BREAK_SUPPRESS_INSIDE);
|
||
|
||
if (aSink) {
|
||
// Consider word-break style. Since the break position of CJK scripts
|
||
// will be set by nsILineBreaker, we don't consider CJK at this point.
|
||
breakState[offset] =
|
||
mBreakHere || (mAfterBreakableSpace && !isBreakableSpace) ||
|
||
mWordBreak == WordBreakRule::BreakAll ||
|
||
mLineBreak == LineBreakRule::Anywhere
|
||
? gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NORMAL
|
||
: gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE;
|
||
}
|
||
mBreakHere = false;
|
||
mAfterBreakableSpace = isBreakableSpace;
|
||
|
||
if (isSpace) {
|
||
if (offset > wordStart && aSink && !(aFlags & BREAK_SUPPRESS_INSIDE)) {
|
||
if (mLineBreak == LineBreakRule::Anywhere) {
|
||
memset(breakState.Elements() + wordStart,
|
||
gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NORMAL,
|
||
offset - wordStart);
|
||
} else if (wordHasComplexChar) {
|
||
// Save current start-of-word state because ComputeBreakPositions()
|
||
// will set it to false.
|
||
AutoRestore<uint8_t> saveWordStartBreakState(breakState[wordStart]);
|
||
LineBreaker::ComputeBreakPositions(
|
||
aText + wordStart, offset - wordStart, mWordBreak, mLineBreak,
|
||
mScriptIsChineseOrJapanese, breakState.Elements() + wordStart);
|
||
}
|
||
}
|
||
|
||
wordHasComplexChar = false;
|
||
mWordContinuation = false;
|
||
++offset;
|
||
if (offset >= aLength) {
|
||
break;
|
||
}
|
||
wordStart = offset;
|
||
} else {
|
||
if (!wordHasComplexChar && IsComplexASCIIChar(ch)) {
|
||
wordHasComplexChar = true;
|
||
}
|
||
++offset;
|
||
if (offset >= aLength) {
|
||
// Save this word
|
||
mCurrentWordContainsComplexChar = wordHasComplexChar;
|
||
uint32_t len = offset - wordStart;
|
||
char16_t* elems = mCurrentWord.AppendElements(len);
|
||
if (!elems) {
|
||
return NS_ERROR_OUT_OF_MEMORY;
|
||
}
|
||
uint32_t i;
|
||
for (i = wordStart; i < offset; ++i) {
|
||
elems[i - wordStart] = aText[i];
|
||
}
|
||
mTextItems.AppendElement(TextItem(aSink, wordStart, len, aFlags));
|
||
// Ensure that the break-before for this word is written out
|
||
offset = wordStart + 1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (!noBreaksNeeded) {
|
||
aSink->SetBreaks(start, offset - start, breakState.Elements() + start);
|
||
}
|
||
return NS_OK;
|
||
}
|
||
|
||
void nsLineBreaker::UpdateCurrentWordLanguage(nsAtom* aHyphenationLanguage) {
|
||
if (mCurrentWordLanguage && mCurrentWordLanguage != aHyphenationLanguage) {
|
||
mCurrentWordContainsMixedLang = true;
|
||
mScriptIsChineseOrJapanese = false;
|
||
} else {
|
||
if (aHyphenationLanguage && !mCurrentWordLanguage) {
|
||
Locale loc;
|
||
auto result =
|
||
LocaleParser::TryParse(nsAtomCString(aHyphenationLanguage), loc);
|
||
|
||
if (result.isErr()) {
|
||
return;
|
||
}
|
||
if (loc.Script().Missing() && loc.AddLikelySubtags().isErr()) {
|
||
return;
|
||
}
|
||
mScriptIsChineseOrJapanese =
|
||
loc.Script().EqualTo("Hans") || loc.Script().EqualTo("Hant") ||
|
||
loc.Script().EqualTo("Jpan") || loc.Script().EqualTo("Hrkt");
|
||
}
|
||
mCurrentWordLanguage = aHyphenationLanguage;
|
||
}
|
||
}
|
||
|
||
nsresult nsLineBreaker::AppendInvisibleWhitespace(uint32_t aFlags) {
|
||
nsresult rv = FlushCurrentWord();
|
||
if (NS_FAILED(rv)) {
|
||
return rv;
|
||
}
|
||
|
||
bool isBreakableSpace = !(aFlags & BREAK_SUPPRESS_INSIDE);
|
||
if (mAfterBreakableSpace && !isBreakableSpace) {
|
||
mBreakHere = true;
|
||
}
|
||
mAfterBreakableSpace = isBreakableSpace;
|
||
mWordContinuation = false;
|
||
return NS_OK;
|
||
}
|
||
|
||
nsresult nsLineBreaker::Reset(bool* aTrailingBreak) {
|
||
nsresult rv = FlushCurrentWord();
|
||
if (NS_FAILED(rv)) {
|
||
return rv;
|
||
}
|
||
|
||
*aTrailingBreak = mBreakHere || mAfterBreakableSpace;
|
||
mBreakHere = false;
|
||
mAfterBreakableSpace = false;
|
||
return NS_OK;
|
||
}
|