Refactor WordIterator into base::BreakIterator....

base/i18n/word_iterator.cc

-// Copyright (c) 2009 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.
-
-#include "base/i18n/word_iterator.h"
-
-#include "base/logging.h"
-#include "unicode/ubrk.h"
-#include "unicode/uchar.h"
-#include "unicode/ustring.h"
-
-const size_t npos = -1;
-
-WordIterator::WordIterator(const string16* str, BreakType break_type)
-    : iter_(NULL),
-      string_(str),
-      break_type_(break_type),
-      prev_(npos),
-      pos_(0) {
-}
-
-WordIterator::~WordIterator() {
-  if (iter_)
-    ubrk_close(iter_);
-}
-
-bool WordIterator::Init() {
-  UErrorCode status = U_ZERO_ERROR;
-  UBreakIteratorType break_type;
-  switch (break_type_) {
-    case BREAK_WORD:
-      break_type = UBRK_WORD;
-      break;
-    case BREAK_LINE:
-      break_type = UBRK_LINE;
-      break;
-    default:
-      NOTREACHED();
-      break_type = UBRK_LINE;
-  }
-  iter_ = ubrk_open(break_type, NULL,
-                    string_->data(), static_cast<int32_t>(string_->size()),
-                    &status);
-  if (U_FAILURE(status)) {
-    NOTREACHED() << "ubrk_open failed";
-    return false;
-  }
-  ubrk_first(iter_);  // Move the iterator to the beginning of the string.
-  return true;
-}
-
-bool WordIterator::Advance() {
-  prev_ = pos_;
-  const int32_t pos = ubrk_next(iter_);
-  if (pos == UBRK_DONE) {
-    pos_ = npos;
-    return false;
-  } else {
-    pos_ = static_cast<size_t>(pos);
-    return true;
-  }
-}
-
-bool WordIterator::IsWord() const {
-  return (ubrk_getRuleStatus(iter_) != UBRK_WORD_NONE);
-}
-
-string16 WordIterator::GetWord() const {
-  DCHECK(prev_ != npos && pos_ != npos);
-  return string_->substr(prev_, pos_ - prev_);
-}