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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_I18N_BIDI_LINE_ITERATOR_H_ | |
| 6 #define BASE_I18N_BIDI_LINE_ITERATOR_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/i18n/base_i18n_export.h" | |
| 10 #include "base/i18n/rtl.h" | |
| 11 #include "base/strings/string16.h" | |
| 12 #include "third_party/icu/source/common/unicode/ubidi.h" | |
| 13 | |
| 14 namespace base { | |
| 15 namespace i18n { | |
| 16 | |
| 17 // A simple wrapper class for the bidirectional iterator of ICU. | |
| 18 // This class uses the bidirectional iterator of ICU to split a line of | |
| 19 // bidirectional texts into visual runs in its display order. | |
| 20 class BASE_I18N_EXPORT BiDiLineIterator { | |
| 21 public: | |
| 22 BiDiLineIterator(); | |
| 23 ~BiDiLineIterator(); | |
| 24 | |
| 25 // Initializes the bidirectional iterator with the specified text. Returns | |
| 26 // whether initialization succeeded. | |
| 27 bool Open(const string16& text, TextDirection direction); | |
| 28 | |
| 29 // Returns the number of visual runs in the text, or zero on error. | |
| 30 int CountRuns(); | |
| 31 | |
| 32 // Gets the logical offset, length, and direction of the specified visual run. | |
| 33 UBiDiDirection GetVisualRun(int index, int* start, int* length); | |
| 34 | |
| 35 // Given a start position, figure out where the run ends (and the BiDiLevel). | |
| 36 void GetLogicalRun(int start, int* end, UBiDiLevel* level); | |
| 37 | |
| 38 private: | |
| 39 UBiDi* bidi_; | |
| 40 | |
| 41 DISALLOW_COPY_AND_ASSIGN(BiDiLineIterator); | |
| 42 }; | |
| 43 | |
| 44 } // namespace i18n | |
| 45 } // namespace base | |
| 46 | |
| 47 #endif // BASE_I18N_BIDI_LINE_ITERATOR_H_ | |
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