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yaws.erl
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yaws.erl
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%%%----------------------------------------------------------------------
%%% File : yaws.erl
%%% Author : Claes Wikstrom <klacke@bluetail.com>
%%% Purpose :
%%% Created : 16 Jan 2002 by Claes Wikstrom <klacke@bluetail.com>
%%%----------------------------------------------------------------------
-module(yaws).
-author('klacke@bluetail.com').
-include_lib("yaws/include/yaws.hrl").
-include_lib("yaws/include/yaws_api.hrl").
-include("yaws_debug.hrl").
-include_lib("kernel/include/file.hrl").
-compile(export_all).
-import(lists, [reverse/1, reverse/2]).
%%-export([Function/Arity, ...]).
start() ->
application:start(yaws, permanent).
stop() ->
application:stop(yaws).
hup(Sock) ->
spawn(fun() ->
group_leader(whereis(user), self()),
dohup(Sock)
end).
dohup(Sock) ->
{Debug, Trace, TraceOut, Conf, _RunMod, _Embed} =
yaws_sup:get_app_args(),
Res = (catch case yaws_config:load(Conf, Trace, TraceOut, Debug) of
{ok, Gconf, Sconfs} ->
yaws_api:setconf(Gconf, Sconfs);
Err ->
Err
end),
gen_tcp:send(Sock, io_lib:format("hupped: ~p~n", [Res])),
gen_tcp:close(Sock).
%%% misc funcs
first(_F, []) ->
false;
first(F, [H|T]) ->
case F(H) of
{ok, Val} ->
{ok, Val, H};
ok ->
{ok, ok, H};
_ ->
first(F, T)
end.
elog(F, As) ->
error_logger:format(F, As).
filesize(Fname) ->
case file:read_file_info(Fname) of
{ok, FI} when FI#file_info.type == regular ->
{ok, FI#file_info.size};
{ok, FI} ->
{error, FI#file_info.type};
Err ->
Err
end.
%%
upto(0, []) ->
[];
upto(_I, []) ->
[];
upto(0, _) ->
" ....";
upto(_I, [0|_]) ->
" ....";
upto(I,[H|T]) ->
[H|upto(I-1, T)].
zip([H1|T1], [H2|T2]) ->
[{H1, H2} |zip(T1, T2)];
zip([], []) ->
[].
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Date and Time functions
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
date_and_time() ->
case catch erlang:now() of
{'EXIT', _} -> % We don't have info about UTC
short_time(calendar:local_time());
Now ->
UTC = calendar:now_to_universal_time(Now),
Local = calendar:universal_time_to_local_time(UTC),
date_and_time(Local, UTC)
end.
date_and_time(Local, UTC) ->
DiffSecs = calendar:datetime_to_gregorian_seconds(Local) -
calendar:datetime_to_gregorian_seconds(UTC),
short_time(Local) ++ diff(DiffSecs).
%% short_time
short_time({{Y,M,D},{H,Mi,S}}) ->
[y1(Y), y2(Y), M, D, H, Mi, S].
%% Format date according to ISO 8601
date_and_time_to_string(DAT) ->
case validate_date_and_time(DAT) of
true ->
dat2str(DAT);
false ->
erlang:fault({badarg, {?MODULE, date_and_time_to_string, [DAT]}})
end.
universal_time_to_string(UTC) ->
Local = calendar:universal_time_to_local_time(UTC),
DT = local_time_to_date_and_time(Local),
date_and_time_to_string(DT).
dat2str([Y1,Y2, Mo, D, H, M, S | Diff]) ->
lists:flatten(
io_lib:format("~s ~w-~2.2.0w-~2.2.0w,~2.2.0w:~2.2.0w:~2.2.0w",
[weekday(Y1,Y2,Mo,D), y(Y1,Y2),Mo,D,H,M,S]) ++
case Diff of
[Sign,Hd,Md] ->
io_lib:format("~c~2.2.0w~2.2.0w",
[Sign,Hd,Md]);
_ -> []
end).
weekday(Y1,Y2,Mo,D) ->
int_to_wd(calendar:day_of_the_week(Y1*256+Y2,Mo,D)).
int_to_wd(1) ->
"Mon";
int_to_wd(2) ->
"Tue";
int_to_wd(3) ->
"Wed";
int_to_wd(4) ->
"Thu";
int_to_wd(5) ->
"Fri";
int_to_wd(6) ->
"Sat";
int_to_wd(7) ->
"Sun".
y1(Y) -> (Y bsr 8) band 255.
y2(Y) -> Y band 255.
y(Y1, Y2) -> 256 * Y1 + Y2.
diff(Secs) ->
case calendar:seconds_to_daystime(Secs) of
{0, {H, M,_}} ->
[$+, H, M];
{-1, _} ->
{0, {H, M, _}} = calendar:seconds_to_daystime(-Secs),
[$-, H, M]
end.
universal_time_to_date_and_time(UTC) ->
short_time(UTC) ++ [$+, 0, 0].
local_time_to_date_and_time(Local) ->
UTC = calendar:local_time_to_universal_time(Local),
date_and_time(Local, UTC).
date_and_time_to_universal_time([Y1,Y2, Mo, D, H, M, S]) ->
%% Local time specified, convert to UTC
Local = {{y(Y1,Y2), Mo, D}, {H, M, S}},
calendar:local_time_to_universal_time(Local);
date_and_time_to_universal_time([Y1,Y2, Mo, D, H, M, S, Sign, Hd, Md]) ->
%% Time specified as local time + diff from UTC. Conv to UTC.
Local = {{y(Y1,Y2), Mo, D}, {H, M, S}},
LocalSecs = calendar:datetime_to_gregorian_seconds(Local),
Diff = (Hd*60 + Md)*60,
UTCSecs = if Sign == $+ -> LocalSecs - Diff;
Sign == $- -> LocalSecs + Diff
end,
calendar:gregorian_seconds_to_datetime(UTCSecs).
validate_date_and_time([Y1,Y2, Mo, D, H, M, S | Diff])
when 0 =< Y1, 0 =< Y2, 0 < Mo, Mo < 13, 0 < D, D < 32, 0 =< H,
H < 24, 0 =< M, M < 60, 0 =< S, S < 61 ->
case check_diff(Diff) of
true ->
calendar:valid_date(y(Y1,Y2), Mo, D);
false ->
false
end;
validate_date_and_time(_) -> false.
check_diff([]) -> true;
check_diff([$+, H, M]) when 0 =< H, H < 24, 0 =< M, M < 60 -> true;
check_diff([$-, H, M]) when 0 =< H, H < 24, 0 =< M, M < 60 -> true;
check_diff(_) -> false.
%% to_string
to_string(X) when float(X) ->
io_lib:format("~.2.0f",[X]);
to_string(X) when integer(X) ->
integer_to_list(X);
to_string(X) when atom(X) ->
atom_to_list(X);
to_string(X) ->
lists:concat([X]).
%%
to_list(L) when list(L) ->
L;
to_list(A) when atom(A) ->
atom_to_list(A).
lowercase([C|S]) -> [lowercase(C)|lowercase(S)];
lowercase(C) when C>=$A, C=<$Z -> C+32;
lowercase(C) -> C.
%%
uppercase([C|S]) -> [uppercase(C)|uppercase(S)];
uppercase(C) when C>=$a, C=<$z -> C-32;
uppercase(C) -> C.
%%
lowercase_string(String) ->
lists:map(fun(X) -> lowercase(X) end, String).
%% integer_to_hex
integer_to_hex(I) ->
case catch erlang:integer_to_list(I, 16) of
{'EXIT', _} ->
old_integer_to_hex(I);
Int ->
Int
end.
old_integer_to_hex(I) when I<10 ->
integer_to_list(I);
old_integer_to_hex(I) when I<16 ->
[I-10+$A];
old_integer_to_hex(I) when I>=16 ->
N = trunc(I/16),
old_integer_to_hex(N) ++ old_integer_to_hex(I rem 16).
%% hex_to_integer
hex_to_integer(Hex) ->
case catch erlang:list_to_integer(Hex, 16) of
{'EXIT', _} ->
old_hex_to_integer(Hex);
X ->
X
end.
old_hex_to_integer(Hex) ->
DEHEX = fun (H) when H >= $a, H =< $f -> H - $a + 10;
(H) when H >= $A, H =< $F -> H - $A + 10;
(H) when H >= $0, H =< $9 -> H - $0
end,
lists:foldl(fun(E, Acc) -> Acc*16+DEHEX(E) end, 0, Hex).
%% string_to_hex
string_to_hex(String) ->
HEXC = fun (D) when D > 9 -> $a + D - 10;
(D) -> $0 + D
end,
lists:foldr(fun (E, Acc) ->
[HEXC(E div 16),HEXC(E rem 16)|Acc]
end, [],
String).
%% hex_to_string
hex_to_string(Hex) ->
DEHEX = fun (H) when H >= $a -> H - $a + 10;
(H) when H >= $A -> H - $A + 10;
(H) -> H - $0
end,
{String, _} =
lists:foldr(fun (E, {Acc, nolow}) ->
{Acc, DEHEX(E)};
(E, {Acc, LO}) ->
{[DEHEX(E)*16+LO|Acc], nolow}
end, {[], nolow},
Hex),
String.
%% mk_list
mk_list([]) ->
[];
mk_list([X]) ->
to_string(X);
mk_list([X|Rest]) ->
[to_string(X)," ",mk_list(Rest)].
universal_time_as_string() ->
time_to_string(calendar:universal_time(), "GMT").
local_time_as_gmt_string(LocalTime) ->
time_to_string(calendar:local_time_to_universal_time(LocalTime),"GMT").
time_to_string( {{Year, Month, Day}, {Hour, Min, Sec}}, Zone) ->
io_lib:format("~s, ~s ~s ~w ~s:~s:~s ~s",
[day(Year, Month, Day),
mk2(Day), month(Month), Year,
mk2(Hour), mk2(Min), mk2(Sec), Zone]).
mk2(I) when I < 10 ->
[$0 | integer_to_list(I)];
mk2(I) ->
integer_to_list(I).
day(Year, Month, Day) ->
int_to_wd(calendar:day_of_the_week(Year, Month, Day)).
month(1) ->
"Jan";
month(2) ->
"Feb";
month(3) ->
"Mar";
month(4) ->
"Apr";
month(5) ->
"May";
month(6) ->
"Jun";
month(7) ->
"Jul";
month(8) ->
"Aug";
month(9) ->
"Sep";
month(10) ->
"Oct";
month(11) ->
"Nov";
month(12) ->
"Dec".
month_str_to_int("Jan") ->
1;
month_str_to_int("Jun") ->
6;
month_str_to_int("Jul") ->
7;
month_str_to_int("Feb") ->
2;
month_str_to_int("Mar") ->
3;
month_str_to_int("Apr") ->
4;
month_str_to_int("May") ->
5;
month_str_to_int("Aug") ->
8;
month_str_to_int("Sep") ->
9;
month_str_to_int("Oct") ->
10;
month_str_to_int("Nov") ->
11;
month_str_to_int("Dec") ->
12.
day_str_to_int("Mon") ->
1;
day_str_to_int("Tue") ->
2;
day_str_to_int("Wed") ->
3;
day_str_to_int("Thu") ->
4;
day_str_to_int("Fri") ->
5;
day_str_to_int("Sat") ->
6;
day_str_to_int("Sun") ->
7.
%% Wed, 23 Jan 2002 19:07:44 GMT
stringdate_to_datetime([$ |T]) ->
stringdate_to_datetime(T);
stringdate_to_datetime([_D1, _D2, _D3, $\,, $ |Tail]) ->
stringdate_to_datetime1(Tail).
stringdate_to_datetime1([A, B, $\s |T]) ->
stringdate_to_datetime2(T, list_to_integer([A,B]));
stringdate_to_datetime1([A, $\s |T]) ->
stringdate_to_datetime2(T, list_to_integer([A])).
stringdate_to_datetime2([M1, M2, M3, $\s , Y1, Y2, Y3, Y4, $\s ,
H1, H2, $:, Min1, Min2,$:,
S1, S2,$\s ,$G, $M, $T|_], Day) ->
{{list_to_integer([Y1,Y2,Y3,Y4]),
month_str_to_int([M1, M2, M3]), Day},
{list_to_integer([H1, H2]),
list_to_integer([Min1, Min2]),
list_to_integer([S1, S2])}}.
%% used by If-Modified-Since header code
is_modified_p(FI, UTC_string) ->
case catch stringdate_to_datetime(UTC_string) of
{'EXIT', _ } ->
true;
UTC ->
Mtime = FI#file_info.mtime,
MtimeUTC = calendar:local_time_to_universal_time(Mtime),
MtimeUTC > UTC
end.
ticker(Time, Msg) ->
S = self(),
spawn_link(yaws, ticker, [Time, S, Msg]).
ticker(Time, To, Msg) ->
process_flag(trap_exit, true),
yaws_ticker:ticker(Time, To, Msg).
fmt_ip({A,B,C,D}) ->
[integer_to_list(A), $.,
integer_to_list(B), $.,
integer_to_list(C), $.,
integer_to_list(D)].
parse_ip(Val) ->
case string:tokens(Val, [$.]) of
Nums = [_X1, _X2, _X3,_X4] ->
L = lists:map(
fun(S) -> (catch list_to_integer(S)) end,
Nums),
case lists:zf(fun(I) when integer(I),
0 =< I,
I =< 255 ->
true;
(_) ->
false
end, L) of
L2 when length(L2) == 4 ->
list_to_tuple(L2);
_ ->
error
end;
_ ->
error
end.
address() ->
?F("<address> ~s Server at ~s </address>",
[
(get(gc))#gconf.yaws,
(get(sc))#sconf.servername]).
is_space($\s) ->
true;
is_space($\r) ->
true;
is_space($\n) ->
true;
is_space($\t) ->
true;
is_space(_) ->
false.
strip_spaces(String) ->
strip_spaces(String, both).
strip_spaces(String, left) ->
drop_spaces(String);
strip_spaces(String, right) ->
lists:reverse(drop_spaces(lists:reverse(String)));
strip_spaces(String, both) ->
strip_spaces(drop_spaces(String), right).
drop_spaces([]) ->
[];
drop_spaces(YS=[X|XS]) ->
case is_space(X) of
true ->
drop_spaces(XS);
false ->
YS
end.
%%% basic uuencode and decode functionality
list_to_uue(L) -> list_to_uue(L, []).
list_to_uue([], Out) ->
reverse([$\n,enc(0)|Out]);
list_to_uue(L, Out) ->
{L45, L1} = get_45(L),
Encoded = encode_line(L45),
list_to_uue(L1, reverse(Encoded, Out)).
uue_to_list(L) ->
uue_to_list(L, []).
uue_to_list([], Out) ->
reverse(Out);
uue_to_list(L, Out) ->
{Decoded, L1} = decode_line(L),
uue_to_list(L1, reverse(Decoded, Out)).
encode_line(L) ->
[enc(length(L))|encode_line1(L)].
encode_line1([C0, C1, C2|T]) ->
Char1 = enc(C0 bsr 2),
Char2 = enc((C0 bsl 4) band 8#60 bor (C1 bsr 4) band 8#17),
Char3 = enc((C1 bsl 2) band 8#74 bor (C2 bsr 6) band 8#3),
Char4 = enc(C2 band 8#77),
[Char1,Char2,Char3,Char4|encode_line1(T)];
encode_line1([C1, C2]) -> encode_line1([C1, C2, 0]);
encode_line1([C]) -> encode_line1([C,0,0]);
encode_line1([]) -> [$\n].
decode_line([H|T]) ->
case dec(H) of
0 -> {[], []};
Len -> decode_line(T, Len, [])
end.
decode_line([P0,P1,P2,P3|T], N, Out) when N >= 3->
Char1 = 16#FF band ((dec(P0) bsl 2) bor (dec(P1) bsr 4)),
Char2 = 16#FF band ((dec(P1) bsl 4) bor (dec(P2) bsr 2)),
Char3 = 16#FF band ((dec(P2) bsl 6) bor dec(P3)),
decode_line(T, N-3, [Char3,Char2,Char1|Out]);
decode_line([P0,P1,P2,_|T], 2, Out) ->
Char1 = 16#FF band ((dec(P0) bsl 2) bor (dec(P1) bsr 4)),
Char2 = 16#FF band ((dec(P1) bsl 4) bor (dec(P2) bsr 2)),
{reverse([Char2,Char1|Out]), tl(T)};
decode_line([P0,P1,_,_|T], 1, Out) ->
Char1 = 16#FF band ((dec(P0) bsl 2) bor (dec(P1) bsr 4)),
{reverse([Char1|Out]), tl(T)};
decode_line(T, 0, Out) ->
{reverse(Out), tl(T)}.
get_45(L) -> get_45(L, 45, []).
get_45(L, 0, F) -> {reverse(F), L};
get_45([H|T], N, L) -> get_45(T, N-1, [H|L]);
get_45([], _N, L) -> {reverse(L), []}.
%% enc/1 is the basic 1 character encoding function to make a char printing
%% dec/1 is the inverse
enc(0) -> $`;
enc(C) -> (C band 8#77) + $ .
dec(Char) -> (Char - $ ) band 8#77.
to_octal(I) -> reverse(to_octal1(I)).
to_octal1(0) -> [];
to_octal1(I) -> [$0 + I band 7|to_octal1(I bsr 3)].
oct_to_dig(O) -> oct_to_dig(O, 0).
oct_to_dig([], D) -> D;
oct_to_dig([H|T], D) -> oct_to_dig(T, D*8 + H - $0).
printversion() ->
io:format("Yaws ~s~n", [yaws_vsn:version()]),
init:stop().
%% our default arg rewriteer does's of cource nothing
arg_rewrite(A) ->
A.
delall(H, [H|T]) ->
delall(H,T);
delall(H,[H1|T]) ->
[H1 | delall(H, T)];
delall(_,[]) ->
[].
to_lowerchar(C) when C >= $A, C =< $Z ->
C+($a-$A);
to_lowerchar(C) ->
C.
to_lower([C|Cs]) when C >= $A, C =< $Z ->
[C+($a-$A)|to_lower(Cs)];
to_lower([C|Cs]) ->
[C|to_lower(Cs)];
to_lower([]) ->
[].
to_integer(I) when list(I) ->
list_to_integer(I);
to_integer(I) when integer(I) ->
I.
funreverse(List, Fun) ->
funreverse(List, Fun, []).
funreverse([H|T], Fun, Ack) ->
funreverse(T, Fun, [Fun(H)|Ack]);
funreverse([], _Fun, Ack) ->
Ack.
%% splits Str in two parts
%% First part leading Upto SubStr and remaining part after
split_at(Str, Substr) ->
split_at(Str, Substr,[]).
split_at(Str, Substr, Ack) ->
case is_prefix(Substr, Str) of
{true, Tail} ->
{lists:reverse(Ack), Tail};
false ->
case Str of
[] ->
{lists:reverse(Ack), []};
[H|T] ->
split_at(T, Substr, [H|Ack])
end
end.
%% is arg1 a prefix of arg2
is_prefix([H|T1], [H|T2]) ->
is_prefix(T1, T2);
is_prefix([], T) ->
{true, T};
is_prefix(_,_) ->
false.
%% Split a string of words seperated by Sep into a list of words and
%% strip off white space.
%%
%% HTML semantics are used, such that empty words are omitted.
split_sep(undefined, _Sep) ->
[];
split_sep(L, Sep) ->
case drop_spaces(L) of
[] -> [];
[Sep|T] -> split_sep(T, Sep);
[C|T] -> split_sep(T, Sep, [C], [])
end.
split_sep([], _Sep, AccL) ->
lists:reverse(AccL);
split_sep([Sep|T], Sep, AccL) ->
split_sep(T, Sep, AccL);
split_sep([C|T], Sep, AccL) ->
split_sep(T, Sep, [C], AccL).
split_sep([], _Sep, AccW, AccL) ->
lists:reverse([lists:reverse(drop_spaces(AccW))|AccL]);
split_sep([Sep|Tail], Sep, AccW, AccL) ->
split_sep(drop_spaces(Tail),
Sep,
[lists:reverse(drop_spaces(AccW))|AccL]);
split_sep([C|Tail], Sep, AccW, AccL) ->
split_sep(Tail, Sep, [C|AccW], AccL).
%% header parsing
parse_qval(S) ->
parse_qval([], S).
parse_qval(A, ";q="++Q) ->
{lists:reverse(A), parse_qvalue(Q)};
parse_qval(A, "") ->
{lists:reverse(A), 1000};
parse_qval(A, [C|T]) ->
parse_qval([C|A], T).
parse_qvalue("0") ->
0;
parse_qvalue("0.") ->
0;
parse_qvalue("1") ->
1000;
parse_qvalue("1.") ->
1000;
parse_qvalue("1.0") ->
1000;
parse_qvalue("1.00") ->
1000;
parse_qvalue("1.000") ->
1000;
parse_qvalue("0."++[D1]) ->
three_digits_to_integer(D1,$0,$0);
parse_qvalue("0."++[D1,D2]) ->
three_digits_to_integer(D1,D2,$0);
parse_qvalue("0."++[D1,D2,D3]) ->
three_digits_to_integer(D1,D2,D3);
parse_qvalue(_) ->
% error
0.
three_digits_to_integer(D1, D2, D3) ->
100*(D1-$0)+10*(D2-$0)+D3-$0.
has_buggy_deflate(UserAgent, Mime) ->
UA = parse_ua(UserAgent),
in_ua(
fun("Mozilla/5.0") ->
in_comment(
fun("rv:0."++_) ->
true;
("Konqueror"++_) ->
true;
(_) ->
false
end,
UA);
("Mozilla/4.0") ->
in_comment(
fun("MSIE"++_) ->
% The fact that IE is
% broken does of
% course mean that we
% will have to abondon
% `deflate' (in favor
% of `gzip')
% altogether. To
% do...
true;
(_) ->
false
end,
UA);
("AppleWebKit"++_) ->
true;
("Galeon"++_) ->
true;
("w3m"++_) ->
% Problems when saving.
Mime /= "text/html";
(_) ->
false
end,
UA).
%% Gzip encoding
accepts_gzip(H, Mime) ->
case [Val || {_,_,'Accept-Encoding',_,Val}<- H#headers.other] of
[] ->
false;
[AcceptEncoding] ->
EncodingList = [parse_qval(X) ||
X <- split_sep(AcceptEncoding, $,)],
case [Q || {"gzip", Q} <- EncodingList]
++ [Q || {"*", Q} <- EncodingList] of
[] ->
false;
[Q|_] -> (Q > 100) % just for fun
and not has_buggy_gzip(
H#headers.user_agent, Mime)
end;
_ ->
false
end.
%%% Advice partly taken from Apache's documentation of `mod_deflate'.
% Only Netscape
% 4.06-4.08 is really
% broken.
has_buggy_gzip("Mozilla/4.06"++_, _) ->
true;
has_buggy_gzip("Mozilla/4.07"++_, _) ->
true;
has_buggy_gzip("Mozilla/4.08"++_, _) ->
true;
% Everything else
% handles at least
% HTML.
has_buggy_gzip(_, "text/html") ->
false;
has_buggy_gzip(UserAgent, Mime) ->
UA = parse_ua(UserAgent),
in_ua(fun("Mozilla/4"++_) ->
% Netscape 4.x may
% choke on anything
% not HTML.
case Mime of
% IE doesn't, but some
% versions are said to
% have issues with
% plugins.
"application/pdf" ->
true;
_ -> not in_comment(
fun("MSIE"++_) ->
true;
(_) -> false
end,
UA)
end;
("w3m"++_) ->
% W3m does not
% decompress when
% saving.
true;
("Opera") ->
% Opera 6 does not
% uncompress downloads.
in_ua(fun("6."++_) -> true;
(_) -> false
end, UA);
("Opera/6."++_) ->
true;
(_) ->
false
end,
UA).
%%% Parsing of User-Agent header.
%%% Yes, this looks a bit like overkill.
tokenize_ua([], Acc) ->
lists:reverse(Acc);
tokenize_ua([$\\ , C|T], Acc) ->
tokenize_ua(T, [C|Acc]);
tokenize_ua([$(|T], Acc) ->
tokenize_ua(T, [popen | Acc]);
tokenize_ua([$)|T], Acc) ->
tokenize_ua(T, [pclose | Acc]);
tokenize_ua([C|T], Acc) ->
tokenize_ua(T, [C|Acc]).
parse_ua(Line) ->
case catch parse_ua_l(tokenize_ua(Line, [])) of
{'EXIT', _} -> [];
Res -> Res
end.
parse_ua_l(Line) ->
case drop_spaces(Line) of
[] ->
[];
[popen|T] ->
{Comment, Tail} = parse_comment(T),
[Comment | parse_ua_l(Tail)];
[pclose|T] ->
% Error, ignore
parse_ua_l(T);
L ->
{UA, Tail} = parse_ua1(L),
[UA | parse_ua_l(Tail)]
end.
parse_comment(L) ->
parse_comment(L, [], []).
parse_comment([], _, _) ->
% Error
{error, []};
parse_comment([pclose|T], CAcc, CsAcc) ->
{{comment, lists:reverse([lists:reverse(CAcc)|CsAcc])}, T};
parse_comment([popen|T], CAcc, CsAcc) ->
{Comment, Tail} = parse_comment(T),
parse_comment(drop_spaces(Tail),
[], [Comment, lists:reverse(CAcc) | CsAcc]);
parse_comment([$;|T], CAcc, CsAcc) ->
parse_comment(drop_spaces(T), [], [lists:reverse(CAcc)|CsAcc]);
parse_comment([C|T], CAcc, CsAcc) ->
parse_comment(T, [C|CAcc], CsAcc).
parse_ua1(L) ->
parse_ua1(L, []).
parse_ua1([], Acc) ->
{{ua,lists:reverse(Acc)}, []};
parse_ua1([popen|T], Acc) ->
{{ua, lists:reverse(Acc)}, [popen|T]};
parse_ua1([pclose|T], _Acc) ->
{error, T};
parse_ua1([$ |T], Acc) ->
{{ua, lists:reverse(Acc)}, T};
parse_ua1([C|T], Acc) ->
parse_ua1(T, [C|Acc]).
in_ua(Pred, L) ->
lists:any(
fun(X) ->
case X of
{ua, UA} -> Pred(UA);
_ -> false
end
end, L).
in_comment(_Pred, []) ->
false;
in_comment(Pred, [{comment, Cs}|T]) ->
case in_comment_l(Pred, Cs) of
true ->
true;
false ->
in_comment(Pred, T)
end;
in_comment(Pred, [_|T]) ->
in_comment(Pred, T).
in_comment_l(Pred, Cs) ->
lists:any(fun(X) ->
case X of
{comment, Cs1} ->
in_comment_l(Pred, Cs1);
error -> false;
L -> Pred(L)
end
end, Cs).
%% imperative out header management
outh_set_status_code(Code) ->