protected function init()
{
if (count(self::$_specials) > 0) {
return;
}
self::$_specials = array('(', ')', '<', '>', '[', ']', ':', ';', '@', ',', '.', '"');
/**
* * Refer to RFC 2822 for ABNF grammar **
*/
// All basic building blocks
self::$_grammar['NO-WS-CTL'] = '[\\x01-\\x08\\x0B\\x0C\\x0E-\\x19\\x7F]';
self::$_grammar['WSP'] = '[ \\t]';
self::$_grammar['CRLF'] = '(?:\\r\\n)';
self::$_grammar['FWS'] = '(?:(?:' . self::$_grammar['WSP'] . '*' . self::$_grammar['CRLF'] . ')?' . self::$_grammar['WSP'] . ')';
self::$_grammar['text'] = '[\\x00-\\x08\\x0B\\x0C\\x0E-\\x7F]';
self::$_grammar['quoted-pair'] = '(?:\\\\' . self::$_grammar['text'] . ')';
self::$_grammar['ctext'] = '(?:' . self::$_grammar['NO-WS-CTL'] . '|[\\x21-\\x27\\x2A-\\x5B\\x5D-\\x7E])';
// Uses recursive PCRE (?1) -- could be a weak point??
self::$_grammar['ccontent'] = '(?:' . self::$_grammar['ctext'] . '|' . self::$_grammar['quoted-pair'] . '|(?1))';
self::$_grammar['comment'] = '(\\((?:' . self::$_grammar['FWS'] . '|' . self::$_grammar['ccontent'] . ')*' . self::$_grammar['FWS'] . '?\\))';
self::$_grammar['CFWS'] = '(?:(?:' . self::$_grammar['FWS'] . '?' . self::$_grammar['comment'] . ')*(?:(?:' . self::$_grammar['FWS'] . '?' . self::$_grammar['comment'] . ')|' . self::$_grammar['FWS'] . '))';
self::$_grammar['qtext'] = '(?:' . self::$_grammar['NO-WS-CTL'] . '|[\\x21\\x23-\\x5B\\x5D-\\x7E])';
self::$_grammar['qcontent'] = '(?:' . self::$_grammar['qtext'] . '|' . self::$_grammar['quoted-pair'] . ')';
self::$_grammar['quoted-string'] = '(?:' . self::$_grammar['CFWS'] . '?"' . '(' . self::$_grammar['FWS'] . '?' . self::$_grammar['qcontent'] . ')*' . self::$_grammar['FWS'] . '?"' . self::$_grammar['CFWS'] . '?)';
self::$_grammar['atext'] = '[a-zA-Z0-9!#\\$%&\'\\*\\+\\-\\/=\\?\\^_`\\{\\}\\|~]';
self::$_grammar['atom'] = '(?:' . self::$_grammar['CFWS'] . '?' . self::$_grammar['atext'] . '+' . self::$_grammar['CFWS'] . '?)';
self::$_grammar['dot-atom-text'] = '(?:' . self::$_grammar['atext'] . '+' . '(\\.' . self::$_grammar['atext'] . '+)*)';
self::$_grammar['dot-atom'] = '(?:' . self::$_grammar['CFWS'] . '?' . self::$_grammar['dot-atom-text'] . '+' . self::$_grammar['CFWS'] . '?)';
self::$_grammar['word'] = '(?:' . self::$_grammar['atom'] . '|' . self::$_grammar['quoted-string'] . ')';
self::$_grammar['phrase'] = '(?:' . self::$_grammar['word'] . '+?)';
self::$_grammar['no-fold-quote'] = '(?:"(?:' . self::$_grammar['qtext'] . '|' . self::$_grammar['quoted-pair'] . ')*")';
self::$_grammar['dtext'] = '(?:' . self::$_grammar['NO-WS-CTL'] . '|[\\x21-\\x5A\\x5E-\\x7E])';
self::$_grammar['no-fold-literal'] = '(?:\\[(?:' . self::$_grammar['dtext'] . '|' . self::$_grammar['quoted-pair'] . ')*\\])';
// Message IDs
self::$_grammar['id-left'] = '(?:' . self::$_grammar['dot-atom-text'] . '|' . self::$_grammar['no-fold-quote'] . ')';
self::$_grammar['id-right'] = '(?:' . self::$_grammar['dot-atom-text'] . '|' . self::$_grammar['no-fold-literal'] . ')';
// Addresses, mailboxes and paths
self::$_grammar['local-part'] = '(?:' . self::$_grammar['dot-atom'] . '|' . self::$_grammar['quoted-string'] . ')';
self::$_grammar['dcontent'] = '(?:' . self::$_grammar['dtext'] . '|' . self::$_grammar['quoted-pair'] . ')';
self::$_grammar['domain-literal'] = '(?:' . self::$_grammar['CFWS'] . '?\\[(' . self::$_grammar['FWS'] . '?' . self::$_grammar['dcontent'] . ')*?' . self::$_grammar['FWS'] . '?\\]' . self::$_grammar['CFWS'] . '?)';
self::$_grammar['domain'] = '(?:' . self::$_grammar['dot-atom'] . '|' . self::$_grammar['domain-literal'] . ')';
self::$_grammar['addr-spec'] = '(?:' . self::$_grammar['local-part'] . '@' . self::$_grammar['domain'] . ')';
}
