base/i18n/char_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/char_iterator.h"
   6
   7 #include "unicode/utf8.h"
   8 #include "unicode/utf16.h"
   9
  10 namespace base {
  11 namespace i18n {
  12
  13 UTF8CharIterator::UTF8CharIterator(const std::string* str)
  14     : str_(reinterpret_cast<const uint8_t*>(str->data())),
  15       len_(str->size()),
  16       array_pos_(0),
  17       next_pos_(0),
  18       char_pos_(0),
  19       char_(0) {
  20   if (len_)
  21     U8_NEXT(str_, next_pos_, len_, char_);
  22 }
  23
  24 UTF8CharIterator::~UTF8CharIterator() {
  25 }
  26
  27 bool UTF8CharIterator::Advance() {
  28   if (array_pos_ >= len_)
  29     return false;
  30
  31   array_pos_ = next_pos_;
  32   char_pos_++;
  33   if (next_pos_ < len_)
  34     U8_NEXT(str_, next_pos_, len_, char_);
  35
  36   return true;
  37 }
  38
  39 UTF16CharIterator::UTF16CharIterator(const string16* str)
  40     : str_(reinterpret_cast<const char16*>(str->data())),
  41       len_(str->size()),
  42       array_pos_(0),
  43       next_pos_(0),
  44       char_pos_(0),
  45       char_(0) {
  46   if (len_)
  47     ReadChar();
  48 }
  49
  50 UTF16CharIterator::UTF16CharIterator(const char16* str, size_t str_len)
  51     : str_(str),
  52       len_(str_len),
  53       array_pos_(0),
  54       next_pos_(0),
  55       char_pos_(0),
  56       char_(0) {
  57   if (len_)
  58     ReadChar();
  59 }
  60
  61 UTF16CharIterator::~UTF16CharIterator() {
  62 }
  63
  64 bool UTF16CharIterator::Advance() {
  65   if (array_pos_ >= len_)
  66     return false;
  67
  68   array_pos_ = next_pos_;
  69   char_pos_++;
  70   if (next_pos_ < len_)
  71     ReadChar();
  72
  73   return true;
  74 }
  75
  76 void UTF16CharIterator::ReadChar() {
  77   // This is actually a huge macro, so is worth having in a separate function.
  78   U16_NEXT(str_, next_pos_, len_, char_);
  79 }
  80
  81 }  // namespace i18n
  82 }  // namespace base