127 lines
3.4 KiB
C++
127 lines
3.4 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/i18n/break_iterator.h"
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#include "base/logging.h"
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#include "third_party/icu/source/common/unicode/ubrk.h"
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#include "third_party/icu/source/common/unicode/uchar.h"
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#include "third_party/icu/source/common/unicode/ustring.h"
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namespace base {
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namespace i18n {
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const size_t npos = -1;
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BreakIterator::BreakIterator(const string16& str, BreakType break_type)
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: iter_(NULL),
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string_(str),
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break_type_(break_type),
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prev_(npos),
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pos_(0) {
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}
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BreakIterator::~BreakIterator() {
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if (iter_)
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ubrk_close(static_cast<UBreakIterator*>(iter_));
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}
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bool BreakIterator::Init() {
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UErrorCode status = U_ZERO_ERROR;
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UBreakIteratorType break_type;
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switch (break_type_) {
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case BREAK_CHARACTER:
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break_type = UBRK_CHARACTER;
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break;
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case BREAK_WORD:
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break_type = UBRK_WORD;
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break;
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case BREAK_LINE:
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case BREAK_NEWLINE:
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break_type = UBRK_LINE;
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break;
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default:
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NOTREACHED() << "invalid break_type_";
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return false;
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}
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iter_ = ubrk_open(break_type, NULL,
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string_.data(), static_cast<int32_t>(string_.size()),
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&status);
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if (U_FAILURE(status)) {
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NOTREACHED() << "ubrk_open failed";
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return false;
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}
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// Move the iterator to the beginning of the string.
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ubrk_first(static_cast<UBreakIterator*>(iter_));
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return true;
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}
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bool BreakIterator::Advance() {
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int32_t pos;
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int32_t status;
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prev_ = pos_;
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switch (break_type_) {
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case BREAK_CHARACTER:
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case BREAK_WORD:
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case BREAK_LINE:
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pos = ubrk_next(static_cast<UBreakIterator*>(iter_));
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if (pos == UBRK_DONE) {
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pos_ = npos;
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return false;
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}
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pos_ = static_cast<size_t>(pos);
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return true;
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case BREAK_NEWLINE:
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do {
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pos = ubrk_next(static_cast<UBreakIterator*>(iter_));
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if (pos == UBRK_DONE)
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break;
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pos_ = static_cast<size_t>(pos);
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status = ubrk_getRuleStatus(static_cast<UBreakIterator*>(iter_));
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} while (status >= UBRK_LINE_SOFT && status < UBRK_LINE_SOFT_LIMIT);
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if (pos == UBRK_DONE && prev_ == pos_) {
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pos_ = npos;
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return false;
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}
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return true;
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default:
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NOTREACHED() << "invalid break_type_";
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return false;
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}
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}
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bool BreakIterator::IsWord() const {
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int32_t status = ubrk_getRuleStatus(static_cast<UBreakIterator*>(iter_));
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return (break_type_ == BREAK_WORD && status != UBRK_WORD_NONE);
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}
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bool BreakIterator::IsEndOfWord(size_t position) const {
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if (break_type_ != BREAK_WORD)
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return false;
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UBreakIterator* iter = static_cast<UBreakIterator*>(iter_);
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UBool boundary = ubrk_isBoundary(iter, static_cast<int32_t>(position));
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int32_t status = ubrk_getRuleStatus(iter);
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return (!!boundary && status != UBRK_WORD_NONE);
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}
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bool BreakIterator::IsStartOfWord(size_t position) const {
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if (break_type_ != BREAK_WORD)
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return false;
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UBreakIterator* iter = static_cast<UBreakIterator*>(iter_);
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UBool boundary = ubrk_isBoundary(iter, static_cast<int32_t>(position));
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ubrk_next(iter);
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int32_t next_status = ubrk_getRuleStatus(iter);
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return (!!boundary && next_status != UBRK_WORD_NONE);
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}
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string16 BreakIterator::GetString() const {
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DCHECK(prev_ != npos && pos_ != npos);
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return string_.substr(prev_, pos_ - prev_);
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}
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} // namespace i18n
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} // namespace base
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