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/* 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 "mozilla/intl/Bidi.h"
#include "mozilla/Casting.h"
#include "mozilla/intl/ICU4CGlue.h"
#if !USE_RUST_UNICODE_BIDI
# include "unicode/ubidi.h"
#endif
namespace mozilla::intl {
#if USE_RUST_UNICODE_BIDI
using namespace ffi;
Bidi::Bidi() = default;
Bidi::~Bidi() = default;
#else
Bidi::Bidi() { mBidi = ubidi_open(); }
Bidi::~Bidi() { ubidi_close(mBidi.GetMut()); }
#endif
ICUResult Bidi::SetParagraph(Span<const char16_t> aParagraph,
BidiEmbeddingLevel aLevel) {
#if USE_RUST_UNICODE_BIDI
const auto* text = reinterpret_cast<const uint16_t*>(aParagraph.Elements());
mBidi.reset(bidi_new(text, aParagraph.Length(), aLevel));
return ToICUResult(U_ZERO_ERROR);
#else
// Do not allow any reordering of the runs, as this can change the
// performance characteristics of working with runs. In the default mode,
// the levels can be iterated over directly, rather than relying on computing
// logical runs on the fly. This can have negative performance characteristics
// compared to iterating over the levels.
//
// In the UBIDI_REORDER_RUNS_ONLY the levels are encoded with additional
// information which can be safely ignored in this Bidi implementation.
// Note that this check is here since setting the mode must be done before
// calls to setting the paragraph.
MOZ_ASSERT(ubidi_getReorderingMode(mBidi.GetMut()) == UBIDI_REORDER_DEFAULT);
UErrorCode status = U_ZERO_ERROR;
ubidi_setPara(mBidi.GetMut(), aParagraph.Elements(),
AssertedCast<int32_t>(aParagraph.Length()), aLevel, nullptr,
&status);
mLevels = nullptr;
return ToICUResult(status);
#endif
}
Bidi::ParagraphDirection Bidi::GetParagraphDirection() const {
#if USE_RUST_UNICODE_BIDI
auto dir = bidi_get_direction(mBidi.get());
switch (dir) {
case -1:
return Bidi::ParagraphDirection::RTL;
case 0:
return Bidi::ParagraphDirection::Mixed;
case 1:
return Bidi::ParagraphDirection::LTR;
default:
MOZ_ASSERT_UNREACHABLE("Bad direction value");
return Bidi::ParagraphDirection::Mixed;
}
#else
switch (ubidi_getDirection(mBidi.GetConst())) {
case UBIDI_LTR:
return Bidi::ParagraphDirection::LTR;
case UBIDI_RTL:
return Bidi::ParagraphDirection::RTL;
case UBIDI_MIXED:
return Bidi::ParagraphDirection::Mixed;
case UBIDI_NEUTRAL:
// This is only used in `ubidi_getBaseDirection` which is unused in this
// API.
MOZ_ASSERT_UNREACHABLE("Unexpected UBiDiDirection value.");
};
return Bidi::ParagraphDirection::Mixed;
#endif
}
/* static */
void Bidi::ReorderVisual(const BidiEmbeddingLevel* aLevels, int32_t aLength,
int32_t* aIndexMap) {
#if USE_RUST_UNICODE_BIDI
bidi_reorder_visual(reinterpret_cast<const uint8_t*>(aLevels), aLength,
aIndexMap);
#else
ubidi_reorderVisual(reinterpret_cast<const uint8_t*>(aLevels), aLength,
aIndexMap);
#endif
}
/* static */
Bidi::BaseDirection Bidi::GetBaseDirection(Span<const char16_t> aText) {
#if USE_RUST_UNICODE_BIDI
const auto* text = reinterpret_cast<const uint16_t*>(aText.Elements());
switch (bidi_get_base_direction(text, aText.Length(), false)) {
case -1:
return Bidi::BaseDirection::RTL;
case 0:
return Bidi::BaseDirection::Neutral;
case 1:
return Bidi::BaseDirection::LTR;
default:
MOZ_ASSERT_UNREACHABLE("Bad base direction value");
return Bidi::BaseDirection::Neutral;
}
#else
UBiDiDirection direction = ubidi_getBaseDirection(
aText.Elements(), AssertedCast<int32_t>(aText.Length()));
switch (direction) {
case UBIDI_LTR:
return Bidi::BaseDirection::LTR;
case UBIDI_RTL:
return Bidi::BaseDirection::RTL;
case UBIDI_NEUTRAL:
return Bidi::BaseDirection::Neutral;
case UBIDI_MIXED:
MOZ_ASSERT_UNREACHABLE("Unexpected UBiDiDirection value.");
}
return Bidi::BaseDirection::Neutral;
#endif
}
#if !USE_RUST_UNICODE_BIDI
static BidiDirection ToBidiDirection(UBiDiDirection aDirection) {
switch (aDirection) {
case UBIDI_LTR:
return BidiDirection::LTR;
case UBIDI_RTL:
return BidiDirection::RTL;
case UBIDI_MIXED:
case UBIDI_NEUTRAL:
MOZ_ASSERT_UNREACHABLE("Unexpected UBiDiDirection value.");
}
return BidiDirection::LTR;
}
#endif
Result<int32_t, ICUError> Bidi::CountRuns() {
#if USE_RUST_UNICODE_BIDI
return bidi_count_runs(mBidi.get());
#else
UErrorCode status = U_ZERO_ERROR;
int32_t runCount = ubidi_countRuns(mBidi.GetMut(), &status);
if (U_FAILURE(status)) {
return Err(ToICUError(status));
}
mLength = ubidi_getProcessedLength(mBidi.GetConst());
mLevels = mLength > 0 ? reinterpret_cast<const BidiEmbeddingLevel*>(
ubidi_getLevels(mBidi.GetMut(), &status))
: nullptr;
if (U_FAILURE(status)) {
return Err(ToICUError(status));
}
return runCount;
#endif
}
void Bidi::GetLogicalRun(int32_t aLogicalStart, int32_t* aLogicalLimitOut,
BidiEmbeddingLevel* aLevelOut) {
#if USE_RUST_UNICODE_BIDI
const int32_t length = bidi_get_length(mBidi.get());
MOZ_DIAGNOSTIC_ASSERT(aLogicalStart < length);
const auto* levels = bidi_get_levels(mBidi.get());
#else
MOZ_ASSERT(mLevels, "CountRuns hasn't been run?");
MOZ_RELEASE_ASSERT(aLogicalStart < mLength, "Out of bound");
const int32_t length = mLength;
const auto* levels = mLevels;
#endif
const uint8_t level = levels[aLogicalStart];
int32_t limit;
for (limit = aLogicalStart + 1; limit < length; limit++) {
if (levels[limit] != level) {
break;
}
}
*aLogicalLimitOut = limit;
*aLevelOut = BidiEmbeddingLevel(level);
}
BidiEmbeddingLevel Bidi::GetParagraphEmbeddingLevel() const {
#if USE_RUST_UNICODE_BIDI
return BidiEmbeddingLevel(bidi_get_paragraph_level(mBidi.get()));
#else
return BidiEmbeddingLevel(ubidi_getParaLevel(mBidi.GetConst()));
#endif
}
BidiDirection Bidi::GetVisualRun(int32_t aRunIndex, int32_t* aLogicalStart,
int32_t* aLength) {
#if USE_RUST_UNICODE_BIDI
auto run = bidi_get_visual_run(mBidi.get(), aRunIndex);
*aLogicalStart = run.start;
*aLength = run.length;
return BidiEmbeddingLevel(run.level).Direction();
#else
return ToBidiDirection(
ubidi_getVisualRun(mBidi.GetMut(), aRunIndex, aLogicalStart, aLength));
#endif
}
} // namespace mozilla::intl
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