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 #pragma once 8 9 #include "unicode/ubidi.h" 10 11 #include "base/basictypes.h" 12 #include "base/string16.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 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, bool right_to_left, bool url); 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_ 48