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-module(erlydtl_dateformat).
-export([format/1, format/2]).
-define(TAG_SUPPORTED(C),
C =:= $a orelse
C =:= $A orelse
C =:= $b orelse
C =:= $B orelse
C =:= $c orelse
C =:= $d orelse
C =:= $D orelse
C =:= $f orelse
C =:= $F orelse
C =:= $g orelse
C =:= $G orelse
C =:= $h orelse
C =:= $H orelse
C =:= $i orelse
C =:= $I orelse
C =:= $j orelse
C =:= $l orelse
C =:= $L orelse
C =:= $m orelse
C =:= $M orelse
C =:= $n orelse
C =:= $N orelse
C =:= $O orelse
C =:= $P orelse
C =:= $r orelse
C =:= $s orelse
C =:= $S orelse
C =:= $t orelse
C =:= $T orelse
C =:= $U orelse
C =:= $w orelse
C =:= $W orelse
C =:= $y orelse
C =:= $Y orelse
C =:= $z orelse
C =:= $Z
).
%
% Format the current date/time
%
format(FormatString) when is_binary(FormatString) ->
format(binary_to_list(FormatString));
format(FormatString) ->
{Date, Time} = erlang:localtime(),
replace_tags(Date, Time, FormatString).
%
% Format a tuple of the form {{Y,M,D},{H,M,S}}
% This is the format returned by erlang:localtime()
% and other standard date/time BIFs
%
format(DateTime, FormatString) when is_binary(FormatString) ->
format(DateTime, binary_to_list(FormatString));
format({{_,_,_} = Date,{_,_,_} = Time}, FormatString) ->
replace_tags(Date, Time, FormatString);
%
% Format a tuple of the form {Y,M,D}
%
format({_,_,_} = Date, FormatString) ->
replace_tags(Date, {0,0,0}, FormatString);
format(DateTime, FormatString) ->
io:format("Unrecognised date paramater : ~p~n", [DateTime]),
FormatString.
replace_tags(Date, Time, Input) ->
replace_tags(Date, Time, Input, [], noslash).
replace_tags(_Date, _Time, [], Out, _State) ->
lists:reverse(Out);
replace_tags(Date, Time, [C|Rest], Out, noslash) when ?TAG_SUPPORTED(C) ->
replace_tags(Date, Time, Rest,
lists:reverse(tag_to_value(C, Date, Time)) ++ Out, noslash);
replace_tags(Date, Time, [$\\|Rest], Out, noslash) ->
replace_tags(Date, Time, Rest, Out, slash);
replace_tags(Date, Time, [C|Rest], Out, slash) ->
replace_tags(Date, Time, Rest, [C|Out], noslash);
replace_tags(Date, Time, [C|Rest], Out, _State) ->
replace_tags(Date, Time, Rest, [C|Out], noslash).
%-----------------------------------------------------------
% Time formatting
%-----------------------------------------------------------
% 'a.m.' or 'p.m.'
tag_to_value($a, _, {H, _, _}) when H > 11 -> "p.m.";
tag_to_value($a, _, _) -> "a.m.";
% 'AM' or 'PM'
tag_to_value($A, _, {H, _, _}) when H > 11 -> "PM";
tag_to_value($A, _, _) -> "AM";
% Swatch Internet time
tag_to_value($B, _, _) ->
""; % NotImplementedError
% ISO 8601 Format.
tag_to_value($c, Date, Time) ->
tag_to_value($Y, Date, Time) ++
"-" ++ tag_to_value($m, Date, Time) ++
"-" ++ tag_to_value($d, Date, Time) ++
"T" ++ tag_to_value($H, Date, Time) ++
":" ++ tag_to_value($i, Date, Time) ++
":" ++ tag_to_value($s, Date, Time);
%
% Time, in 12-hour hours and minutes, with minutes
% left off if they're zero.
%
% Examples: '1', '1:30', '2:05', '2'
%
% Proprietary extension.
%
tag_to_value($f, Date, {H, 0, S}) ->
% If min is zero then return the hour only
tag_to_value($g, Date, {H, 0, S});
tag_to_value($f, Date, Time) ->
% Otherwise return hours and mins
tag_to_value($g, Date, Time)
++ ":" ++ tag_to_value($i, Date, Time);
% Hour, 12-hour format without leading zeros; i.e. '1' to '12'
tag_to_value($g, _, {H,_,_}) ->
integer_to_list(hour_24to12(H));
% Hour, 24-hour format without leading zeros; i.e. '0' to '23'
tag_to_value($G, _, {H,_,_}) ->
integer_to_list(H);
% Hour, 12-hour format; i.e. '01' to '12'
tag_to_value($h, _, {H,_,_}) ->
integer_to_list_zerofill(hour_24to12(H));
% Hour, 24-hour format; i.e. '00' to '23'
tag_to_value($H, _, {H,_,_}) ->
integer_to_list_zerofill(H);
% Minutes; i.e. '00' to '59'
tag_to_value($i, _, {_,M,_}) ->
integer_to_list_zerofill(M);
% Time, in 12-hour hours, minutes and 'a.m.'/'p.m.', with minutes left off
% if they're zero and the strings 'midnight' and 'noon' if appropriate.
% Examples: '1 a.m.', '1:30 p.m.', 'midnight', 'noon', '12:30 p.m.'
% Proprietary extension.
tag_to_value($P, _, {0, 0, _}) -> "midnight";
tag_to_value($P, _, {12, 0, _}) -> "noon";
tag_to_value($P, Date, Time) ->
tag_to_value($f, Date, Time)
++ " " ++ tag_to_value($a, Date, Time);
% Seconds; i.e. '00' to '59'
tag_to_value($s, _, {_,_,S}) ->
integer_to_list_zerofill(S);
%-----------------------------------------------------------
% Date formatting
%-----------------------------------------------------------
% Month, textual, 3 letters, lowercase; e.g. 'jan'
tag_to_value($b, {_,M,_}, _) ->
string:sub_string(monthname(M), 1, 3);
% Day of the month, 2 digits with leading zeros; i.e. '01' to '31'
tag_to_value($d, {_, _, D}, _) ->
integer_to_list_zerofill(D);
% Day of the week, textual, 3 letters; e.g. 'Fri'
tag_to_value($D, Date, _) ->
Dow = calendar:day_of_the_week(Date),
ucfirst(string:sub_string(dayname(Dow), 1, 3));
% Month, textual, long; e.g. 'January'
tag_to_value($F, {_,M,_}, _) ->
ucfirst(monthname(M));
% '1' if Daylight Savings Time, '0' otherwise.
tag_to_value($I, _, _) ->
"TODO";
% Day of the month without leading zeros; i.e. '1' to '31'
tag_to_value($j, {_, _, D}, _) ->
integer_to_list(D);
% Day of the week, textual, long; e.g. 'Friday'
tag_to_value($l, Date, _) ->
ucfirst(dayname(calendar:day_of_the_week(Date)));
% Boolean for whether it is a leap year; i.e. True or False
tag_to_value($L, {Y,_,_}, _) ->
case calendar:is_leap_year(Y) of
true -> "True";
_ -> "False"
end;
% Month; i.e. '01' to '12'
tag_to_value($m, {_, M, _}, _) ->
integer_to_list_zerofill(M);
% Month, textual, 3 letters; e.g. 'Jan'
tag_to_value($M, {_,M,_}, _) ->
ucfirst(string:sub_string(monthname(M), 1, 3));
% Month without leading zeros; i.e. '1' to '12'
tag_to_value($n, {_, M, _}, _) ->
integer_to_list(M);
% Month abbreviation in Associated Press style. Proprietary extension.
tag_to_value($N, {_,M,_}, _) when M =:= 9 ->
% Special case - "Sept."
ucfirst(string:sub_string(monthname(M), 1, 4)) ++ ".";
tag_to_value($N, {_,M,_}, _) when M < 3 orelse M > 7 ->
% Jan, Feb, Aug, Oct, Nov, Dec are all
% abbreviated with a full-stop appended.
ucfirst(string:sub_string(monthname(M), 1, 3)) ++ ".";
tag_to_value($N, {_,M,_}, _) ->
% The rest are the fullname.
ucfirst(monthname(M));
% Difference to Greenwich time in hours; e.g. '+0200'
tag_to_value($O, Date, Time) ->
Diff = utc_diff(Date, Time),
Offset = if
Diff < 0 ->
io_lib:format("-~4..0w", [abs(Diff)]);
true ->
io_lib:format("+~4..0w", [Diff])
end,
lists:flatten(Offset);
% RFC 2822 formatted date; e.g. 'Thu, 21 Dec 2000 16:01:07 +0200'
tag_to_value($r, Date, Time) ->
replace_tags(Date, Time, "D, j M Y H:i:s O");
% English ordinal suffix for the day of the month, 2 characters;
% i.e. 'st', 'nd', 'rd' or 'th'
tag_to_value($S, {_, _, D}, _) when
D rem 100 =:= 11 orelse
D rem 100 =:= 12 orelse
D rem 100 =:= 13 -> "th";
tag_to_value($S, {_, _, D}, _) when D rem 10 =:= 1 -> "st";
tag_to_value($S, {_, _, D}, _) when D rem 10 =:= 2 -> "nd";
tag_to_value($S, {_, _, D}, _) when D rem 10 =:= 3 -> "rd";
tag_to_value($S, _, _) -> "th";
% Number of days in the given month; i.e. '28' to '31'
tag_to_value($t, {Y,M,_}, _) ->
integer_to_list(calendar:last_day_of_the_month(Y,M));
% Time zone of this machine; e.g. 'EST' or 'MDT'
tag_to_value($T, _, _) ->
"TODO";
% Seconds since the Unix epoch (January 1 1970 00:00:00 GMT)
tag_to_value($U, Date, Time) ->
EpochSecs = calendar:datetime_to_gregorian_seconds({Date, Time})
- calendar:datetime_to_gregorian_seconds({{1970,1,1},{0,0,0}}),
integer_to_list(EpochSecs);
% Day of the week, numeric, i.e. '0' (Sunday) to '6' (Saturday)
tag_to_value($w, Date, _) ->
% Note: calendar:day_of_the_week returns
% 1 | .. | 7. Monday = 1, Tuesday = 2, ..., Sunday = 7
integer_to_list(calendar:day_of_the_week(Date) rem 7);
% ISO-8601 week number of year, weeks starting on Monday
tag_to_value($W, {Y,M,D}, _) ->
integer_to_list(year_weeknum(Y,M,D));
% Year, 2 digits; e.g. '99'
tag_to_value($y, {Y, _, _}, _) ->
string:sub_string(integer_to_list(Y), 3);
% Year, 4 digits; e.g. '1999'
tag_to_value($Y, {Y, _, _}, _) ->
integer_to_list(Y);
% Day of the year; i.e. '0' to '365'
tag_to_value($z, {Y,M,D}, _) ->
integer_to_list(day_of_year(Y,M,D));
% Time zone offset in seconds (i.e. '-43200' to '43200'). The offset for
% timezones west of UTC is always negative, and for those east of UTC is
% always positive.
tag_to_value($Z, _, _) ->
"TODO";
tag_to_value(C, Date, Time) ->
io:format("Unimplemented tag : ~p [Date : ~p] [Time : ~p]",
[C, Date, Time]),
"".
% Date helper functions
day_of_year(Y,M,D) ->
day_of_year(Y,M,D,0).
day_of_year(_Y,M,D,Count) when M =< 1 ->
D + Count;
day_of_year(Y,M,D,Count) when M =< 12 ->
day_of_year(Y, M - 1, D, Count + calendar:last_day_of_the_month(Y,M));
day_of_year(Y,_M,D,_Count) ->
day_of_year(Y, 12, D, 0).
hour_24to12(0) -> 12;
hour_24to12(H) when H < 13 -> H;
hour_24to12(H) when H < 24 -> H - 12;
hour_24to12(H) -> H.
year_weeknum(Y,M,D) ->
First = (calendar:day_of_the_week(Y, 1, 1) rem 7) - 1,
Wk = ((((calendar:date_to_gregorian_days(Y, M, D) -
calendar:date_to_gregorian_days(Y, 1, 1)) + First) div 7)
+ (case First < 4 of true -> 1; _ -> 0 end)),
case Wk of
0 -> weeks_in_year(Y - 1);
_ -> case weeks_in_year(Y) of
WksInThisYear when Wk > WksInThisYear -> 1;
_ -> Wk
end
end.
weeks_in_year(Y) ->
D1 = calendar:day_of_the_week(Y, 1, 1),
D2 = calendar:day_of_the_week(Y, 12, 31),
if (D1 =:= 4 orelse D2 =:= 4) -> 53; true -> 52 end.
utc_diff({Y, M, D}, Time) when Y < 1970->
utc_diff({1970, M, D}, Time);
utc_diff(Date, Time) ->
LTime = {Date, Time},
UTime = erlang:localtime_to_universaltime(LTime),
DiffSecs = calendar:datetime_to_gregorian_seconds(LTime) -
calendar:datetime_to_gregorian_seconds(UTime),
trunc((DiffSecs / 3600) * 100).
dayname(1) -> "monday";
dayname(2) -> "tuesday";
dayname(3) -> "wednesday";
dayname(4) -> "thursday";
dayname(5) -> "friday";
dayname(6) -> "saturday";
dayname(7) -> "sunday";
dayname(_) -> "???".
monthname(1) -> "january";
monthname(2) -> "february";
monthname(3) -> "march";
monthname(4) -> "april";
monthname(5) -> "may";
monthname(6) -> "june";
monthname(7) -> "july";
monthname(8) -> "august";
monthname(9) -> "september";
monthname(10) -> "october";
monthname(11) -> "november";
monthname(12) -> "december";
monthname(_) -> "???".
% Utility functions
integer_to_list_zerofill(N) when is_float(N) ->
integer_to_list_zerofill(erlang:round(N));
integer_to_list_zerofill(N) when N < 10 ->
lists:flatten(io_lib:format("~2..0B", [N]));
integer_to_list_zerofill(N) when is_integer(N) ->
integer_to_list(N).
ucfirst([First | Rest]) when First >= $a, First =< $z ->
[First-($a-$A) | Rest];
ucfirst(Other) ->
Other.
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