rfc2045.treetop - mail-2.5.4 Documentation

module Mail

    grammar RFC2045

      rule tspecials
        "(" / ")" / "<" / ">" / "@" /
        "," / ";" / ":" / '\\' / "<" / ">" /
        "/" / "[" / "]" / "?" / "="
      end

      rule ietf_token
        token+
      end

      rule custom_x_token
        [xX] "-" token+
      end

      rule iana_token
        token+

# <A publicly-defined extension token. Tokens # of this form must be registered with IANA # as specified in RFC 2048.>

      end

      rule token
        [\x21-\x27] /       # any (US-ASCII) CHAR
        [\x2a-\x2b] /       # except SPACE,
        [\x2c-\x2e] /       # CTLs,
        [\x30-\x39] /       # or tspecials
        [\x41-\x5a] /
        [\x5e-\x7e]
      end

    end

end