virtual size_t Prev(IterType what)
{
int32_t pos;
switch (what) {
case ITER_CHARACTER:
pos = this->char_itr->previous();
break;
case ITER_WORD:
pos = this->word_itr->preceding(this->char_itr->current());
/* The ICU word iterator considers both the start and the end of a word a valid
* break point, but we only want word starts. Move to the previous location in
* case the new position points to whitespace. */
while (pos != icu::BreakIterator::DONE &&
IsWhitespace(Utf16DecodeChar((const uint16 *)&this->utf16_str[pos]))) {
int32_t new_pos = this->word_itr->previous();
/* Don't set it to DONE if it was valid before. Otherwise we'll return END
* even though the iterator wasn't at the start of the string before. */
if (new_pos == icu::BreakIterator::DONE) break;
pos = new_pos;
}
this->char_itr->isBoundary(pos);
break;
default:
NOT_REACHED();
}
return pos == icu::BreakIterator::DONE ? END : this->utf16_to_utf8[pos];
}
virtual size_t Next(IterType what)
{
int32_t pos;
switch (what) {
case ITER_CHARACTER:
pos = this->char_itr->next();
break;
case ITER_WORD:
pos = this->word_itr->following(this->char_itr->current());
/* The ICU word iterator considers both the start and the end of a word a valid
* break point, but we only want word starts. Move to the next location in
* case the new position points to whitespace. */
while (pos != icu::BreakIterator::DONE && IsWhitespace(Utf16DecodeChar((const uint16 *)&this->utf16_str[pos]))) pos = this->word_itr->next();
this->char_itr->isBoundary(pos);
break;
default:
NOT_REACHED();
}
return pos == icu::BreakIterator::DONE ? END : this->utf16_to_utf8[pos];
}
