function addWords($words, $tag = '') {
if ($tag != $this->_tag) {
$this
->_flushGroup($tag);
}
foreach ($words as $word) {
// new-line should only come as first char of word.
if ($word == '') {
continue;
}
if ($word[0] == "\n") {
$this
->_flushLine($tag);
$word = drupal_substr($word, 1);
}
assert(!strstr($word, "\n"));
$this->_group .= $word;
}
}