/**
* This method return a tuple representing the token discovered.
*
* @access public
* @param \Unicity\IO\Reader $reader the reader to be used
* @return \Unicity\Lexer\Scanner\Tuple a tuple representing the token
* discovered
*/
public function process(IO\Reader $reader)
{
$index = $reader->position();
$char = $reader->readChar($index, false);
if ($char == $this->quotation) {
$lookahead = $index + 1;
$length = $reader->length() - 1;
while ($lookahead <= $length) {
if ($reader->readChar($lookahead, false) == $this->quotation) {
if ($lookahead == $length || $reader->readChar($lookahead + 1, false) != $this->quotation) {
$lookahead++;
break;
}
$lookahead++;
}
$lookahead++;
}
$token = $reader->readRange($index, $lookahead);
$tuple = new Lexer\Scanner\Tuple(Lexer\Scanner\TokenType::literal(), new Common\String($token));
return $tuple;
}
return null;
}
