blob: b83be71287f5103cffdc56076c385a4077a8acf6 [file] [log] [blame]
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/i18n/rtl.h"
#include "base/macros.h"
#include "base/strings/string16.h"
#include "third_party/icu/source/common/unicode/ubidi.h"
#include "third_party/icu/source/common/unicode/uchar.h"
#include "ui/gfx/gfx_export.h"
namespace ui {
namespace gfx {
// A simple wrapper class for the bidirectional iterator of ICU.
// This class uses the bidirectional iterator of ICU to split a line of
// bidirectional texts into visual runs in its display order.
class GFX_EXPORT BiDiLineIterator {
// Initializes the bidirectional iterator with the specified text. Returns
// whether initialization succeeded.
bool Open(const base::string16& text, base::i18n::TextDirection direction);
// Returns the number of visual runs in the text, or zero on error.
int CountRuns() const;
// Gets the logical offset, length, and direction of the specified visual run.
UBiDiDirection GetVisualRun(int index, int* start, int* length) const;
// Given a start position, figure out where the run ends (and the BiDiLevel).
void GetLogicalRun(int start, int* end, UBiDiLevel* level) const;
UBiDi* bidi_;
} // namespace gfx
} // namespace ui