mirror of
https://github.com/mozilla/gecko-dev.git
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9137955c65
This changes some function signatures to take a nsTArray<T>& instead of a FallibleTArray<T>& because AutoTArray does not inherit from FallibleTArray. This is effectively a no-op because the affected array operations already use `mozilla::fallible`.
499 lines
16 KiB
C++
499 lines
16 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsLineBreaker.h"
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#include "nsContentUtils.h"
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#include "nsILineBreaker.h"
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#include "gfxTextRun.h" // for the gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_* values
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#include "nsHyphenationManager.h"
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#include "nsHyphenator.h"
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#include "mozilla/gfx/2D.h"
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nsLineBreaker::nsLineBreaker()
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: mCurrentWordLanguage(nullptr),
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mCurrentWordContainsMixedLang(false),
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mCurrentWordContainsComplexChar(false),
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mAfterBreakableSpace(false), mBreakHere(false),
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mWordBreak(nsILineBreaker::kWordBreak_Normal)
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{
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}
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nsLineBreaker::~nsLineBreaker()
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{
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NS_ASSERTION(mCurrentWord.Length() == 0, "Should have Reset() before destruction!");
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}
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static void
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SetupCapitalization(const char16_t* aWord, uint32_t aLength,
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bool* aCapitalization)
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{
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// Capitalize the first alphanumeric character after a space or start
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// of the word.
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// The only space character a word can contain is NBSP.
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bool capitalizeNextChar = true;
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for (uint32_t i = 0; i < aLength; ++i) {
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uint32_t ch = aWord[i];
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if (capitalizeNextChar) {
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if (NS_IS_HIGH_SURROGATE(ch) && i + 1 < aLength &&
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NS_IS_LOW_SURROGATE(aWord[i + 1])) {
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ch = SURROGATE_TO_UCS4(ch, aWord[i + 1]);
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}
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if (nsContentUtils::IsAlphanumeric(ch)) {
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aCapitalization[i] = true;
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capitalizeNextChar = false;
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}
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if (!IS_IN_BMP(ch)) {
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++i;
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}
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}
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if (ch == 0xA0 /*NBSP*/) {
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capitalizeNextChar = true;
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}
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}
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}
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nsresult
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nsLineBreaker::FlushCurrentWord()
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{
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uint32_t length = mCurrentWord.Length();
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AutoTArray<uint8_t,4000> breakState;
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if (!breakState.AppendElements(length))
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return NS_ERROR_OUT_OF_MEMORY;
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nsTArray<bool> capitalizationState;
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if (!mCurrentWordContainsComplexChar) {
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// For break-strict set everything internal to "break", otherwise
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// to "no break"!
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memset(breakState.Elements(),
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mWordBreak == nsILineBreaker::kWordBreak_BreakAll ?
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gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NORMAL :
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gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE,
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length*sizeof(uint8_t));
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} else {
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nsContentUtils::LineBreaker()->
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GetJISx4051Breaks(mCurrentWord.Elements(), length, mWordBreak,
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breakState.Elements());
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}
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bool autoHyphenate = mCurrentWordLanguage &&
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!mCurrentWordContainsMixedLang;
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uint32_t i;
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for (i = 0; autoHyphenate && i < mTextItems.Length(); ++i) {
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TextItem* ti = &mTextItems[i];
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if (!(ti->mFlags & BREAK_USE_AUTO_HYPHENATION)) {
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autoHyphenate = false;
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}
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}
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if (autoHyphenate) {
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RefPtr<nsHyphenator> hyphenator =
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nsHyphenationManager::Instance()->GetHyphenator(mCurrentWordLanguage);
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if (hyphenator) {
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FindHyphenationPoints(hyphenator,
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mCurrentWord.Elements(),
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mCurrentWord.Elements() + length,
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breakState.Elements());
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}
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}
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uint32_t offset = 0;
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for (i = 0; i < mTextItems.Length(); ++i) {
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TextItem* ti = &mTextItems[i];
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NS_ASSERTION(ti->mLength > 0, "Zero length word contribution?");
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if ((ti->mFlags & BREAK_SUPPRESS_INITIAL) && ti->mSinkOffset == 0) {
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breakState[offset] = gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE;
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}
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if (ti->mFlags & BREAK_SUPPRESS_INSIDE) {
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uint32_t exclude = ti->mSinkOffset == 0 ? 1 : 0;
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memset(breakState.Elements() + offset + exclude,
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gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE,
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(ti->mLength - exclude)*sizeof(uint8_t));
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}
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// Don't set the break state for the first character of the word, because
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// it was already set correctly earlier and we don't know what the true
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// value should be.
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uint32_t skipSet = i == 0 ? 1 : 0;
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if (ti->mSink) {
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ti->mSink->SetBreaks(ti->mSinkOffset + skipSet, ti->mLength - skipSet,
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breakState.Elements() + offset + skipSet);
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if (ti->mFlags & BREAK_NEED_CAPITALIZATION) {
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if (capitalizationState.Length() == 0) {
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if (!capitalizationState.AppendElements(length))
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return NS_ERROR_OUT_OF_MEMORY;
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memset(capitalizationState.Elements(), false, length*sizeof(bool));
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SetupCapitalization(mCurrentWord.Elements(), length,
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capitalizationState.Elements());
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}
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ti->mSink->SetCapitalization(ti->mSinkOffset, ti->mLength,
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capitalizationState.Elements() + offset);
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}
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}
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offset += ti->mLength;
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}
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mCurrentWord.Clear();
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mTextItems.Clear();
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mCurrentWordContainsComplexChar = false;
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mCurrentWordContainsMixedLang = false;
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mCurrentWordLanguage = nullptr;
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return NS_OK;
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}
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// If the aFlags parameter to AppendText has all these bits set,
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// then we don't need to worry about finding break opportunities
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// in the appended text.
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#define NO_BREAKS_NEEDED_FLAGS (BREAK_SUPPRESS_INITIAL | \
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BREAK_SUPPRESS_INSIDE | \
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BREAK_SKIP_SETTING_NO_BREAKS)
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nsresult
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nsLineBreaker::AppendText(nsIAtom* aHyphenationLanguage, const char16_t* aText, uint32_t aLength,
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uint32_t aFlags, nsILineBreakSink* aSink)
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{
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NS_ASSERTION(aLength > 0, "Appending empty text...");
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uint32_t offset = 0;
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// Continue the current word
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if (mCurrentWord.Length() > 0) {
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NS_ASSERTION(!mAfterBreakableSpace && !mBreakHere, "These should not be set");
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while (offset < aLength && !IsSpace(aText[offset])) {
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mCurrentWord.AppendElement(aText[offset]);
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if (!mCurrentWordContainsComplexChar && IsComplexChar(aText[offset])) {
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mCurrentWordContainsComplexChar = true;
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}
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UpdateCurrentWordLanguage(aHyphenationLanguage);
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++offset;
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}
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if (offset > 0) {
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mTextItems.AppendElement(TextItem(aSink, 0, offset, aFlags));
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}
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if (offset == aLength)
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return NS_OK;
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// We encountered whitespace, so we're done with this word
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nsresult rv = FlushCurrentWord();
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if (NS_FAILED(rv))
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return rv;
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}
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AutoTArray<uint8_t,4000> breakState;
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if (aSink) {
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if (!breakState.AppendElements(aLength))
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return NS_ERROR_OUT_OF_MEMORY;
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}
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bool noCapitalizationNeeded = true;
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nsTArray<bool> capitalizationState;
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if (aSink && (aFlags & BREAK_NEED_CAPITALIZATION)) {
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if (!capitalizationState.AppendElements(aLength))
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return NS_ERROR_OUT_OF_MEMORY;
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memset(capitalizationState.Elements(), false, aLength*sizeof(bool));
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noCapitalizationNeeded = false;
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}
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uint32_t start = offset;
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bool noBreaksNeeded = !aSink ||
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((aFlags & NO_BREAKS_NEEDED_FLAGS) == NO_BREAKS_NEEDED_FLAGS &&
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!mBreakHere && !mAfterBreakableSpace);
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if (noBreaksNeeded && noCapitalizationNeeded) {
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// Skip to the space before the last word, since either the break data
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// here is not needed, or no breaks are set in the sink and there cannot
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// be any breaks in this chunk; and we don't need to do word-initial
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// capitalization. All we need is the context for the next chunk (if any).
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offset = aLength;
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while (offset > start) {
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--offset;
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if (IsSpace(aText[offset]))
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break;
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}
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}
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uint32_t wordStart = offset;
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bool wordHasComplexChar = false;
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RefPtr<nsHyphenator> hyphenator;
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if ((aFlags & BREAK_USE_AUTO_HYPHENATION) &&
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!(aFlags & BREAK_SUPPRESS_INSIDE) &&
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aHyphenationLanguage) {
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hyphenator = nsHyphenationManager::Instance()->GetHyphenator(aHyphenationLanguage);
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}
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for (;;) {
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char16_t ch = aText[offset];
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bool isSpace = IsSpace(ch);
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bool isBreakableSpace = isSpace && !(aFlags & BREAK_SUPPRESS_INSIDE);
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if (aSink && !noBreaksNeeded) {
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breakState[offset] =
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mBreakHere || (mAfterBreakableSpace && !isBreakableSpace) ||
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(mWordBreak == nsILineBreaker::kWordBreak_BreakAll) ?
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gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NORMAL :
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gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE;
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}
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mBreakHere = false;
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mAfterBreakableSpace = isBreakableSpace;
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if (isSpace) {
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if (offset > wordStart && aSink) {
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if (!(aFlags & BREAK_SUPPRESS_INSIDE)) {
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if (wordHasComplexChar) {
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// Save current start-of-word state because GetJISx4051Breaks will
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// set it to false
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uint8_t currentStart = breakState[wordStart];
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nsContentUtils::LineBreaker()->
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GetJISx4051Breaks(aText + wordStart, offset - wordStart,
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mWordBreak,
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breakState.Elements() + wordStart);
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breakState[wordStart] = currentStart;
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}
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if (hyphenator) {
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FindHyphenationPoints(hyphenator,
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aText + wordStart, aText + offset,
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breakState.Elements() + wordStart);
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}
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}
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if (!noCapitalizationNeeded) {
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SetupCapitalization(aText + wordStart, offset - wordStart,
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capitalizationState.Elements() + wordStart);
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}
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}
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wordHasComplexChar = false;
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++offset;
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if (offset >= aLength)
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break;
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wordStart = offset;
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} else {
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if (!wordHasComplexChar && IsComplexChar(ch)) {
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wordHasComplexChar = true;
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}
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++offset;
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if (offset >= aLength) {
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// Save this word
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mCurrentWordContainsComplexChar = wordHasComplexChar;
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uint32_t len = offset - wordStart;
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char16_t* elems = mCurrentWord.AppendElements(len);
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if (!elems)
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return NS_ERROR_OUT_OF_MEMORY;
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memcpy(elems, aText + wordStart, sizeof(char16_t)*len);
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mTextItems.AppendElement(TextItem(aSink, wordStart, len, aFlags));
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// Ensure that the break-before for this word is written out
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offset = wordStart + 1;
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UpdateCurrentWordLanguage(aHyphenationLanguage);
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break;
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}
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}
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}
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if (aSink) {
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if (!noBreaksNeeded) {
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aSink->SetBreaks(start, offset - start, breakState.Elements() + start);
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}
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if (!noCapitalizationNeeded) {
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aSink->SetCapitalization(start, offset - start,
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capitalizationState.Elements() + start);
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}
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}
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return NS_OK;
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}
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void
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nsLineBreaker::FindHyphenationPoints(nsHyphenator *aHyphenator,
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const char16_t *aTextStart,
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const char16_t *aTextLimit,
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uint8_t *aBreakState)
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{
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nsDependentSubstring string(aTextStart, aTextLimit);
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AutoTArray<bool,200> hyphens;
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if (NS_SUCCEEDED(aHyphenator->Hyphenate(string, hyphens))) {
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for (uint32_t i = 0; i + 1 < string.Length(); ++i) {
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if (hyphens[i]) {
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aBreakState[i + 1] =
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gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_HYPHEN;
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}
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}
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}
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}
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nsresult
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nsLineBreaker::AppendText(nsIAtom* aHyphenationLanguage, const uint8_t* aText, uint32_t aLength,
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uint32_t aFlags, nsILineBreakSink* aSink)
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{
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NS_ASSERTION(aLength > 0, "Appending empty text...");
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if (aFlags & (BREAK_NEED_CAPITALIZATION | BREAK_USE_AUTO_HYPHENATION)) {
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// Defer to the Unicode path if capitalization or hyphenation is required
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nsAutoString str;
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const char* cp = reinterpret_cast<const char*>(aText);
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CopyASCIItoUTF16(nsDependentCSubstring(cp, cp + aLength), str);
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return AppendText(aHyphenationLanguage, str.get(), aLength, aFlags, aSink);
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}
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uint32_t offset = 0;
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// Continue the current word
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if (mCurrentWord.Length() > 0) {
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NS_ASSERTION(!mAfterBreakableSpace && !mBreakHere, "These should not be set");
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while (offset < aLength && !IsSpace(aText[offset])) {
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mCurrentWord.AppendElement(aText[offset]);
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if (!mCurrentWordContainsComplexChar &&
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IsComplexASCIIChar(aText[offset])) {
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mCurrentWordContainsComplexChar = true;
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}
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++offset;
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}
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if (offset > 0) {
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mTextItems.AppendElement(TextItem(aSink, 0, offset, aFlags));
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}
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if (offset == aLength) {
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// We did not encounter whitespace so the word hasn't finished yet.
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return NS_OK;
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}
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// We encountered whitespace, so we're done with this word
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nsresult rv = FlushCurrentWord();
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if (NS_FAILED(rv))
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return rv;
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}
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AutoTArray<uint8_t,4000> breakState;
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if (aSink) {
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if (!breakState.AppendElements(aLength))
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return NS_ERROR_OUT_OF_MEMORY;
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}
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uint32_t start = offset;
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bool noBreaksNeeded = !aSink ||
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((aFlags & NO_BREAKS_NEEDED_FLAGS) == NO_BREAKS_NEEDED_FLAGS &&
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!mBreakHere && !mAfterBreakableSpace);
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if (noBreaksNeeded) {
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// Skip to the space before the last word, since either the break data
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// here is not needed, or no breaks are set in the sink and there cannot
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// be any breaks in this chunk; all we need is the context for the next
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// chunk (if any)
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offset = aLength;
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while (offset > start) {
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--offset;
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if (IsSpace(aText[offset]))
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break;
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}
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}
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uint32_t wordStart = offset;
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bool wordHasComplexChar = false;
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for (;;) {
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uint8_t ch = aText[offset];
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bool isSpace = IsSpace(ch);
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bool isBreakableSpace = isSpace && !(aFlags & BREAK_SUPPRESS_INSIDE);
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if (aSink) {
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// Consider word-break style. Since the break position of CJK scripts
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// will be set by nsILineBreaker, we don't consider CJK at this point.
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breakState[offset] =
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mBreakHere || (mAfterBreakableSpace && !isBreakableSpace) ||
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(mWordBreak == nsILineBreaker::kWordBreak_BreakAll) ?
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gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NORMAL :
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gfxTextRun::CompressedGlyph::FLAG_BREAK_TYPE_NONE;
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}
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mBreakHere = false;
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mAfterBreakableSpace = isBreakableSpace;
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if (isSpace) {
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if (offset > wordStart && wordHasComplexChar) {
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if (aSink && !(aFlags & BREAK_SUPPRESS_INSIDE)) {
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// Save current start-of-word state because GetJISx4051Breaks will
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// set it to false
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uint8_t currentStart = breakState[wordStart];
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nsContentUtils::LineBreaker()->
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GetJISx4051Breaks(aText + wordStart, offset - wordStart,
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mWordBreak,
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breakState.Elements() + wordStart);
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breakState[wordStart] = currentStart;
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}
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wordHasComplexChar = false;
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}
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++offset;
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if (offset >= aLength)
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break;
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wordStart = offset;
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} else {
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if (!wordHasComplexChar && IsComplexASCIIChar(ch)) {
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wordHasComplexChar = true;
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}
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++offset;
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if (offset >= aLength) {
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// Save this word
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mCurrentWordContainsComplexChar = wordHasComplexChar;
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uint32_t len = offset - wordStart;
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char16_t* elems = mCurrentWord.AppendElements(len);
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if (!elems)
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return NS_ERROR_OUT_OF_MEMORY;
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uint32_t i;
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for (i = wordStart; i < offset; ++i) {
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elems[i - wordStart] = aText[i];
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}
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mTextItems.AppendElement(TextItem(aSink, wordStart, len, aFlags));
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// Ensure that the break-before for this word is written out
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offset = wordStart + 1;
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break;
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}
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}
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}
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if (!noBreaksNeeded) {
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aSink->SetBreaks(start, offset - start, breakState.Elements() + start);
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}
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return NS_OK;
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}
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void
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nsLineBreaker::UpdateCurrentWordLanguage(nsIAtom *aHyphenationLanguage)
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{
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if (mCurrentWordLanguage && mCurrentWordLanguage != aHyphenationLanguage) {
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mCurrentWordContainsMixedLang = true;
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} else {
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mCurrentWordLanguage = aHyphenationLanguage;
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}
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}
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nsresult
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nsLineBreaker::AppendInvisibleWhitespace(uint32_t aFlags)
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{
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nsresult rv = FlushCurrentWord();
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if (NS_FAILED(rv))
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return rv;
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bool isBreakableSpace = !(aFlags & BREAK_SUPPRESS_INSIDE);
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if (mAfterBreakableSpace && !isBreakableSpace) {
|
|
mBreakHere = true;
|
|
}
|
|
mAfterBreakableSpace = isBreakableSpace;
|
|
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;
|
|
}
|