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// 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/break_iterator.h"
#include "base/logging.h"
#include "unicode/ubrk.h"
#include "unicode/uchar.h"
#include "unicode/ustring.h"
namespace base {
const size_t npos = -1;
BreakIterator::BreakIterator(const string16* str, BreakType break_type)
: iter_(NULL),
string_(str),
break_type_(break_type),
prev_(npos),
pos_(0) {
}
BreakIterator::~BreakIterator() {
if (iter_)
ubrk_close(iter_);
}
bool BreakIterator::Init() {
UErrorCode status = U_ZERO_ERROR;
UBreakIteratorType break_type;
switch (break_type_) {
case BREAK_WORD:
break_type = UBRK_WORD;
break;
case BREAK_SPACE:
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 BreakIterator::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 BreakIterator::IsWord() const {
return (break_type_ == BREAK_WORD &&
ubrk_getRuleStatus(iter_) != UBRK_WORD_NONE);
}
string16 BreakIterator::GetString() const {
DCHECK(prev_ != npos && pos_ != npos);
return string_->substr(prev_, pos_ - prev_);
}
} // namespace base
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