base/i18n/bidi_line_iterator.cc

   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
   9 namespace base {
  10 namespace i18n {
  11
  12 BiDiLineIterator::BiDiLineIterator() : bidi_(NULL) {
  13 }
  14
  15 BiDiLineIterator::~BiDiLineIterator() {
  16   if (bidi_) {
  17     ubidi_close(bidi_);
  18     bidi_ = NULL;
  19   }
  20 }
  21
  22 bool 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
  38 int 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
  45 UBiDiDirection BiDiLineIterator::GetVisualRun(int index,
  46                                               int* start,
  47                                               int* length) {
  48   DCHECK(bidi_ != NULL);
  49   return ubidi_getVisualRun(bidi_, index, start, length);
  50 }
  51
  52 void 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