bidi_line_iterator.cc revision 5821806d5e7f356e8fa4b058a389a808ea183019 
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#include "base/i18n/bidi_line_iterator.h"
6
7#include "base/logging.h"
8
9namespace base {
10namespace i18n {
11
12BiDiLineIterator::BiDiLineIterator() : bidi_(NULL) {
13}
14
15BiDiLineIterator::~BiDiLineIterator() {
16  if (bidi_) {
17    ubidi_close(bidi_);
18    bidi_ = NULL;
19  }
20}
21
22bool BiDiLineIterator::Open(const string16& text,
23                            bool right_to_left,
24                            bool url) {
25  DCHECK(!bidi_);
26  UErrorCode error = U_ZERO_ERROR;
27  bidi_ = ubidi_openSized(static_cast<int>(text.length()), 0, &error);
28  if (U_FAILURE(error))
29    return false;
30  if (right_to_left && url)
31    ubidi_setReorderingMode(bidi_, UBIDI_REORDER_RUNS_ONLY);
32  ubidi_setPara(bidi_, text.data(), static_cast<int>(text.length()),
33                right_to_left ? UBIDI_DEFAULT_RTL : UBIDI_DEFAULT_LTR,
34                NULL, &error);
35  return (U_SUCCESS(error) == TRUE);
36}
37
38int BiDiLineIterator::CountRuns() {
39  DCHECK(bidi_ != NULL);
40  UErrorCode error = U_ZERO_ERROR;
41  const int runs = ubidi_countRuns(bidi_, &error);
42  return U_SUCCESS(error) ? runs : 0;
43}
44
45UBiDiDirection BiDiLineIterator::GetVisualRun(int index,
46                                              int* start,
47                                              int* length) {
48  DCHECK(bidi_ != NULL);
49  return ubidi_getVisualRun(bidi_, index, start, length);
50}
51
52void BiDiLineIterator::GetLogicalRun(int start,
53                                     int* end,
54                                     UBiDiLevel* level) {
55  DCHECK(bidi_ != NULL);
56  ubidi_getLogicalRun(bidi_, start, end, level);
57}
58
59}  // namespace i18n
60}  // namespace base
61