function Internal_CleanupWSByEatingInput($pattern) {
if (strlen($pattern) <= 0) return;
foreach (str_split($pattern) as $char) {
switch ($char) {
case 's':
$token_type = $this->lexer->NextToken();
while ($token_type == BBCODE_WS) {
$token_type = $this->lexer->NextToken();
}
$this->lexer->UngetToken();
break;
case 'n':
$token_type = $this->lexer->NextToken();
if ($token_type != BBCODE_NL)
$this->lexer->UngetToken();
break;
case 'a':
$token_type = $this->lexer->NextToken();
while ($token_type == BBCODE_WS || $token_type == BBCODE_NL) {
$token_type = $this->lexer->NextToken();
}
$this->lexer->UngetToken();
break;
}
}
}