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// 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_);
}
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