| // Copyright (c) 2006-2008 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/word_iterator.h" |
| |
| #include "base/logging.h" |
| #include "unicode/ubrk.h" |
| #include "unicode/ustring.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; |
| } |
| #if defined(WCHAR_T_IS_UTF16) |
| iter_ = ubrk_open(break_type, NULL, |
| string_.data(), static_cast<int32_t>(string_.size()), |
| &status); |
| #else // WCHAR_T_IS_UTF16 |
| // When wchar_t is wider than UChar (16 bits), transform |string_| into a |
| // UChar* string. Size the UChar* buffer to be large enough to hold twice |
| // as many UTF-16 code points as there are UCS-4 characters, in case each |
| // character translates to a UTF-16 surrogate pair, and leave room for a NUL |
| // terminator. |
| // TODO(avi): avoid this alloc |
| chars_.resize(string_.length() * sizeof(UChar) + 1); |
| |
| UErrorCode error = U_ZERO_ERROR; |
| int32_t destLength; |
| u_strFromWCS(&chars_[0], chars_.size(), &destLength, string_.data(), |
| string_.length(), &error); |
| |
| iter_ = ubrk_open(break_type, NULL, &chars_[0], destLength, &status); |
| #endif |
| 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); |
| } |
| |
| std::wstring WordIterator::GetWord() const { |
| DCHECK(prev_ >= 0 && pos_ >= 0); |
| return string_.substr(prev_, pos_ - prev_); |
| } |
| |