blob: 178d775f2439bf017f30ffd89b032277fe7c3c68 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef APP_BIDI_LINE_ITERATOR_H_
#define APP_BIDI_LINE_ITERATOR_H_
#pragma once
#include <string>
#include "unicode/ubidi.h"
#include "base/basictypes.h"
// A simple wrapper class for the bidirectional iterator of ICU.
// This class uses the bidirectional iterator of ICU to split a line of
// bidirectional texts into visual runs in its display order.
class BiDiLineIterator {
public:
BiDiLineIterator() : bidi_(NULL) { }
~BiDiLineIterator();
// Initializes the bidirectional iterator with the specified text. Returns
// whether initialization succeeded.
UBool Open(const std::wstring& text, bool right_to_left, bool url);
// Returns the number of visual runs in the text, or zero on error.
int CountRuns();
// Gets the logical offset, length, and direction of the specified visual run.
UBiDiDirection GetVisualRun(int index, int* start, int* length);
// Given a start position, figure out where the run ends (and the BiDiLevel).
void GetLogicalRun(int start, int* end, UBiDiLevel* level);
private:
UBiDi* bidi_;
DISALLOW_COPY_AND_ASSIGN(BiDiLineIterator);
};
#endif // APP_BIDI_LINE_ITERATOR_H_
|
