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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/bidi_line_iterator.h"
#include "base/check.h"
#include "base/notreached.h"
namespace ui {
namespace gfx {
namespace {
UBiDiLevel GetParagraphLevelForDirection(base::i18n::TextDirection direction) {
switch (direction) {
case base::i18n::UNKNOWN_DIRECTION:
return UBIDI_DEFAULT_LTR;
case base::i18n::RIGHT_TO_LEFT:
return 1; // Highest RTL level.
case base::i18n::LEFT_TO_RIGHT:
return 0; // Highest LTR level.
default:
NOTREACHED();
}
}
} // namespace
BiDiLineIterator::BiDiLineIterator() = default;
BiDiLineIterator::~BiDiLineIterator() = default;
bool BiDiLineIterator::Open(std::u16string_view text,
base::i18n::TextDirection direction) {
DCHECK(!bidi_);
UErrorCode error = U_ZERO_ERROR;
bidi_.reset(ubidi_openSized(static_cast<int>(text.length()), 0, &error));
if (U_FAILURE(error))
return false;
ubidi_setPara(bidi_.get(), text.data(), static_cast<int>(text.length()),
GetParagraphLevelForDirection(direction), nullptr, &error);
return (U_SUCCESS(error));
}
int BiDiLineIterator::CountRuns() const {
DCHECK(bidi_ != nullptr);
UErrorCode error = U_ZERO_ERROR;
const int runs = ubidi_countRuns(bidi_.get(), &error);
return U_SUCCESS(error) ? runs : 0;
}
UBiDiDirection BiDiLineIterator::GetVisualRun(int index,
int* start,
int* length) const {
DCHECK(bidi_ != nullptr);
return ubidi_getVisualRun(bidi_.get(), index, start, length);
}
void BiDiLineIterator::GetLogicalRun(int start,
int* end,
UBiDiLevel* level) const {
DCHECK(bidi_ != nullptr);
ubidi_getLogicalRun(bidi_.get(), start, end, level);
}
} // namespace gfx
} // namespace ui
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