protected function doScan(Scanner $scanner)
{
$type = $scanner->tokenType();
$start_state = null;
foreach ($this->parsers as $parser) {
$start_state = $scanner->getState();
if ($type == $parser->trigger($scanner) && $parser->scan($scanner)) {
return true;
}
}
$scanner->setState($start_state);
return false;
}
protected function doScan(Scanner $scanner)
{
$quotechar = $scanner->tokenType();
$ret = false;
$string = "";
while ($token = $scanner->nextToken()) {
if ($token == $quotechar) {
$ret = true;
break;
}
$string .= $scanner->token();
}
if ($string && !$this->discard) {
$scanner->getContext()->pushResult($string);
}
return $ret;
}
final function scan(Scanner $scanner)
{
if ($scanner->tokenType() == Scanner::SOF) {
$scanner->nextToken();
}
$ret = $this->doScan($scanner);
if ($ret && !$this->discard && $this->term()) {
$this->push($scanner);
}
if ($ret) {
$this->invokeHandler($scanner);
}
if ($this->term() && $ret) {
$this->next($scanner);
}
$this->report("::scan returning {$ret}");
return $ret;
}
function trigger(Scanner $scanner)
{
if ($scanner->tokenType() != Scanner::WORD) {
return false;
}
if (is_null($this->word)) {
return true;
}
return $this->word == $scanner->token();
}
/**
* sign: '!' sign | '+' sign | '-' sign | index
*/
private static function parseSign(Scanner $scanner)
{
switch ($scanner->tokenType()) {
case '!':
$scanner->nextToken();
$result = new NotExpression(self::parseSign($scanner));
break;
case '+':
$scanner->nextToken();
$result = self::parseSign($scanner);
break;
case '-':
$scanner->nextToken();
$result = new MinusExpression(self::parseSign($scanner));
break;
default:
$result = self::parseIndex($scanner);
}
return $result;
}
