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/strings/string16.h" 11 #include "third_party/icu/source/common/unicode/ubidi.h" 12 13 namespace base { 14 namespace i18n { 15 16 // A simple wrapper class for the bidirectional iterator of ICU. 17 // This class uses the bidirectional iterator of ICU to split a line of 18 // bidirectional texts into visual runs in its display order. 19 class BASE_I18N_EXPORT BiDiLineIterator { 20 public: 21 BiDiLineIterator(); 22 ~BiDiLineIterator(); 23 24 // Initializes the bidirectional iterator with the specified text. Returns 25 // whether initialization succeeded. 26 bool Open(const string16& text, bool right_to_left, bool url); 27 28 // Returns the number of visual runs in the text, or zero on error. 29 int CountRuns(); 30 31 // Gets the logical offset, length, and direction of the specified visual run. 32 UBiDiDirection GetVisualRun(int index, int* start, int* length); 33 34 // Given a start position, figure out where the run ends (and the BiDiLevel). 35 void GetLogicalRun(int start, int* end, UBiDiLevel* level); 36 37 private: 38 UBiDi* bidi_; 39 40 DISALLOW_COPY_AND_ASSIGN(BiDiLineIterator); 41 }; 42 43 } // namespace i18n 44 } // namespace base 45 46 #endif // BASE_I18N_BIDI_LINE_ITERATOR_H_ 47