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61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_I18N_BIDI_LINE_ITERATOR_H_
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#define BASE_I18N_BIDI_LINE_ITERATOR_H_
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#include "base/i18n/base_i18n_export.h"
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#include "base/i18n/rtl.h"
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#include "base/macros.h"
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#include "base/strings/string16.h"
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#include "third_party/icu/source/common/unicode/ubidi.h"
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#include "third_party/icu/source/common/unicode/uchar.h"
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namespace base {
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namespace i18n {
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// A simple wrapper class for the bidirectional iterator of ICU.
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// This class uses the bidirectional iterator of ICU to split a line of
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// bidirectional texts into visual runs in its display order.
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class BASE_I18N_EXPORT BiDiLineIterator {
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public:
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// Specifies some alternative iteration behavior.
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enum class CustomBehavior {
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// No special behavior.
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NONE,
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// Treat URL delimiter characters as strong LTR. This is a special treatment
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// for URLs that purposefully violates the URL Standard, as an experiment.
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// It should only be used behind a flag.
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AS_URL
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};
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BiDiLineIterator();
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~BiDiLineIterator();
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// Initializes the bidirectional iterator with the specified text. Returns
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// whether initialization succeeded.
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bool Open(const string16& text,
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TextDirection direction,
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CustomBehavior behavior);
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// Returns the number of visual runs in the text, or zero on error.
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int CountRuns() const;
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// Gets the logical offset, length, and direction of the specified visual run.
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UBiDiDirection GetVisualRun(int index, int* start, int* length) const;
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// Given a start position, figure out where the run ends (and the BiDiLevel).
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void GetLogicalRun(int start, int* end, UBiDiLevel* level) const;
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private:
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UBiDi* bidi_;
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DISALLOW_COPY_AND_ASSIGN(BiDiLineIterator);
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};
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} // namespace i18n
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} // namespace base
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#endif // BASE_I18N_BIDI_LINE_ITERATOR_H_
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