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%%{
machine common;
action comment_begin { fcall comment_tail; }
action comment_exit { fret; }
# RFC5322: address_lists, date_time, message_ids, phrase_lists, received
obs_NO_WS_CTL = 0x01..0x08 | 0x0b | 0x0c | 0x0e..0x1f | 0x7f;
LF = "\n";
CR = "\r";
CRLF = "\r\n";
WSP = 0x09 | 0x20;
obs_ctext = obs_NO_WS_CTL;
VCHAR = 0x21..0x7e;
obs_qp = "\\" (0x00 | obs_NO_WS_CTL | LF | CR);
obs_FWS = (CRLF? WSP)+;
ctext = 0x21..0x27 | 0x2a..0x5b | 0x5d..0x7e | obs_ctext;
quoted_pair = ("\\" (VCHAR | WSP)) | obs_qp;
FWS = (WSP* CRLF WSP+) | (CRLF WSP+) | obs_FWS;
ALPHA = [a-zA-Z];
DIGIT = [0-9];
DQUOTE = '"';
obs_qtext = obs_NO_WS_CTL;
atext = ALPHA | DIGIT | "!" | "#" | "$" | "%" | "&" |
"'" | "*" | "+" | "-" | "/" | "=" | "?" | "^" |
"_" | "`" | "{" | "|" | "}" | "~";
qtext = 0x21 | 0x23..0x5b | 0x5d..0x7e | obs_qtext;
obs_dtext = obs_NO_WS_CTL | quoted_pair;
qcontent = qtext | quoted_pair;
# Handle recursive comments
ccontent = ctext | quoted_pair | "(" @comment_begin;
comment_tail := ((FWS? ccontent)* >comment_s) FWS? ")" @comment_exit;
comment = "(" @comment_begin %comment_e;
CFWS = ((FWS? comment)+ FWS?) | FWS;
quoted_string = CFWS?
(DQUOTE
(((FWS? qcontent)* FWS?) >qstr_s %qstr_e)
DQUOTE)
CFWS?;
atom = CFWS? atext+ CFWS?;
word = atom | quoted_string;
# phrase_lists
obs_phrase = (word | "." | "@")+;
phrase = (obs_phrase | word+) >phrase_s %phrase_e;
phrase_lists = phrase ("," FWS* phrase)*;
# address_lists
# local_part:
domain_text = (DQUOTE (FWS? qcontent)+ FWS? DQUOTE) | atext+;
local_dot_atom_text = ("."* domain_text "."*)+;
local_dot_atom = CFWS?
(local_dot_atom_text >local_dot_atom_s %local_dot_atom_pre_comment_e)
CFWS?;
obs_local_part = word ("." word)*;
local_part = (local_dot_atom >local_dot_atom_s %local_dot_atom_e |
(quoted_string %local_quoted_string_e) |
obs_local_part);
# Treetop parser behavior was to ignore addresses missing '@' inside of angle
# brackets. This construction preserves that behavior.
local_part_no_capture = (local_dot_atom | quoted_string | obs_local_part);
# domain:
dot_atom_text = "."* domain_text ("."* domain_text)*;
dtext = 0x21..0x5a | 0x5e..0x7e | obs_dtext;
dot_atom = CFWS? dot_atom_text (CFWS? >(comment_after_address,1));
domain_literal = CFWS? "[" (FWS? dtext)* FWS? "]" CFWS?;
obs_domain = atom ("." atom)*;
domain = (dot_atom | domain_literal | obs_domain) >domain_s %domain_e;
# addr_spec:
# The %(end_addr,N) priority resolves uncertainty when whitespace
# after an addr_spec could cause it to be interpreted as a
# display name: "bar@example.com ,..."
addr_spec_in_angle_brackets =
(local_part "@" domain) %(end_addr,1) |
local_part_no_capture %(end_addr,0);
addr_spec_no_angle_brackets =
(local_part "@" domain) %(end_addr,1) |
local_part %(end_addr,0);
# angle_addr:
obs_domain_list = (CFWS | ",")* "@" domain ("," CFWS? ("@" domain)?)*;
obs_route = (obs_domain_list ":") >obs_domain_list_s %obs_domain_list_e;
obs_angle_addr = CFWS? "<" obs_route? addr_spec_in_angle_brackets ">" CFWS?;
angle_addr = CFWS? ("<" >angle_addr_s) addr_spec_in_angle_brackets ">" CFWS? |
obs_angle_addr;
# Address
display_name = phrase;
name_addr = display_name? %(end_addr,2) angle_addr;
mailbox = (name_addr | addr_spec_no_angle_brackets) >address_s %address_e;
obs_mbox_list = (CFWS? ",")* mailbox ("," (mailbox | CFWS)?)*;
mailbox_list = (mailbox (("," | ";") mailbox)*) | obs_mbox_list;
obs_group_list = (CFWS? ",")+ CFWS?;
group_list = mailbox_list | CFWS | obs_group_list;
group = (display_name >group_name_s %group_name_e) ":"
(group_list?) ";" CFWS?;
address = group | mailbox;
#obs_addr_list = (CFWS? ",")* address ("," (address | CFWS)?)*;
address_lists = address? %(comment_after_address,0)
(FWS* ("," | ";") FWS* address?)*;
# message_ids
obs_id_left = local_part;
id_left = dot_atom_text | obs_id_left;
# id_right modifications to support multiple '@' in msg_id.
msg_id_atext = ALPHA | DIGIT | "!" | "#" | "$" | "%" | "&" | "'" | "*" |
"+" | "-" | "/" | "=" | "?" | "^" | "_" | "`" | "{" | "|" |
"}" | "~" | "@";
msg_id_dot_atom_text = (msg_id_atext+ "."?)+;
obs_id_right = domain;
no_fold_literal = "[" (dtext)* "]";
id_right = msg_id_dot_atom_text | no_fold_literal | obs_id_right;
msg_id = (CFWS)?
(("<" id_left "@" id_right ">") >msg_id_s %msg_id_e)
(CFWS)?;
message_ids = msg_id (CFWS? msg_id)*;
include date_time "date_time.rl";
date_time = (day_of_week ",")?
(date >date_s %date_e) <: (time >time_s %time_e) CFWS?;
# Added CFWS? to increase robustness
# (qmail likes to include a comment style string...?)
received_token = word | angle_addr | addr_spec_no_angle_brackets | domain;
received = ((CFWS? received_token*) >received_tokens_s %received_tokens_e)
";" date_time;
# RFC2045: mime_version, content_type, content_transfer_encoding
mime_version = CFWS?
(DIGIT+ >major_digits_s %major_digits_e)
comment? "." comment?
(DIGIT+ >minor_digits_s %minor_digits_e)
CFWS?;
token = 0x21..0x27 | 0x2a..0x2b | 0x2c..0x2e |
0x30..0x39 | 0x41..0x5a | 0x5e..0x7e;
value = (quoted_string | (token -- '"' | 0x3d)+) >param_val_s %param_val_e;
attribute = (token+) >param_attr_s %param_attr_e;
parameter = CFWS? attribute "=" value CFWS?;
ietf_token = token+;
custom_x_token = 'x'i "-" token+;
extension_token = ietf_token | custom_x_token;
discrete_type = 'text'i | 'image'i | 'audio'i | 'video'i |
'application'i | extension_token;
composite_type = 'message'i | 'multipart'i | extension_token;
iana_token = token+;
main_type = (discrete_type | composite_type) >main_type_s %main_type_e;
sub_type = (extension_token | iana_token) >sub_type_s %sub_type_e;
content_type = main_type "/" sub_type (((CFWS? ";"+) | CFWS) parameter CFWS?)*;
encoding = ('7bits' | '8bits' | '7bit' | '8bit' | 'binary' |
'quoted-printable' | 'base64' | ietf_token |
custom_x_token) >encoding_s %encoding_e;
content_transfer_encoding = CFWS? encoding CFWS? ";"? CFWS?;
# RFC2183: content_disposition
# TODO: recognize filename, size, creation date, etc.
disposition_type = 'inline'i | 'attachment'i | extension_token | '';
content_disposition = (disposition_type >disp_type_s %disp_type_e)
(CFWS? ";" parameter CFWS?)*;
# Envelope From
ctime_date = day_name " "+ month " "+ day " " time_of_day " " year;
null_sender = ('<>' ' '{0,1});
envelope_from = (addr_spec_no_angle_brackets | null_sender) >address_s %address_e " "
(ctime_date >ctime_date_s %ctime_date_e);
# content_location
location = quoted_string | ((token | 0x3d)+ >token_string_s %token_string_e);
content_location = CFWS? location CFWS?;
}%%
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