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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "base/logging.h"
#include "base/word_iterator.h"
#include "unicode/ubrk.h"
const int WordIterator::npos = -1;
WordIterator::WordIterator(const std::wstring& 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<int>(pos);
return true;
}
}
bool WordIterator::IsWord() const {
return (ubrk_getRuleStatus(iter_) != UBRK_WORD_NONE);
}
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