/**
* Transform file content to structured Rules
* @return Rules The valid ruleset
*/
public function parse()
{
$rules = new Rules();
$userAgent = $rule = null;
$separator = "\r\n";
$line = strtok($this->content, $separator);
while ($line !== false) {
if (strpos($line, '#') !== 0) {
if (preg_match('/^User-Agent\\: (.*)$/i', $line, $matches)) {
if ($userAgent !== null && $rule !== null) {
$rules->add($userAgent, $rule);
}
$userAgent = $matches[1];
$rule = new Rule();
} elseif (preg_match('/^Allow: (.*)$/i', $line, $matches)) {
$rule->allow($matches[1]);
} elseif (preg_match('/^Disallow: (.*)$/i', $line, $matches)) {
$rule->disallow($matches[1]);
}
}
$line = strtok($separator);
}
//Handle the last item in the loop
if ($rule instanceof Rule) {
$rules->add($userAgent, $rule);
}
return $rules;
}
