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1 // Copyright (c) 2010 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 APP_BIDI_LINE_ITERATOR_H_ | |
6 #define APP_BIDI_LINE_ITERATOR_H_ | |
7 #pragma once | |
8 | |
9 #include <string> | |
10 | |
11 #include "unicode/ubidi.h" | |
12 | |
13 #include "base/basictypes.h" | |
14 #include "base/string16.h" | |
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 BiDiLineIterator { | |
20 public: | |
21 BiDiLineIterator() : bidi_(NULL) { } | |
22 ~BiDiLineIterator(); | |
23 | |
24 // Initializes the bidirectional iterator with the specified text. Returns | |
25 // whether initialization succeeded. | |
26 UBool 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 #endif // APP_BIDI_LINE_ITERATOR_H_ | |
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