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language: elixir
elixir:
- 1.2.1
otp_release:
- 18.2
matrix:
include:
- elixir: 1.0.5
otp_release: 17.5
- elixir: 1.1.0
otp_release: 17.5
notifications:
recipients:
- alisdairsullivan@yahoo.ca

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Copyright 2016 alisdair sullivan
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The MIT License (MIT)
Copyright (c) 2016 alisdair sullivan
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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# iso8601
parse and format iso8601 strings in elixir and erlang

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defmodule RFC3339 do
defstruct year: nil, month: nil, day: nil,
hour: nil, min: nil, sec: nil, usec: nil,
tz_offset: nil
def parse(dt) do
case :rfc3339.parse(dt) do
{:ok, {date, time, tz}} ->
dt = %RFC3339{}
dt = insert_date(dt, date)
dt = insert_time(dt, time)
insert_tz(dt, tz)
{:error, error} ->
RFC3339.Error.from_erl(error)
end
end
def format(dt), do: :rfc3339.format(dt)
defp insert_date(dt, {year, month, day}) do
%{ dt | :year => year, :month => month, :day => day }
end
defp insert_date(dt, :undefined), do: dt
defp insert_time(dt, {hour, min, sec, :undefined}) do
%{ dt | :hour => hour, :min => min, :sec => sec }
end
defp insert_time(dt, {hour, min, sec, usec}) do
%{ dt | :hour => hour, :min => min, :sec => sec, :usec => usec }
end
defp insert_time(dt, :undefined), do: dt
defp insert_tz(dt, :undefined), do: dt
defp insert_tz(dt, offset), do: %{ dt | :tz_offset => offset }
end
defmodule RFC3339.Error do
defstruct message: nil, reason: nil
def from_erl(error) do
%RFC3339.Error{message: error_to_message(error), reason: error}
end
defp error_to_message(_), do: ""
end

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defmodule RFC3339.Mixfile do
use Mix.Project
@version "0.0.1"
def project do
[app: :rfc3339,
version: @version,
description: description,
elixir: "~> 1.2",
package: package,
build_embedded: Mix.env == :prod,
start_permanent: Mix.env == :prod,
deps: deps]
end
def application do
[applications: []]
end
defp description do
"an rfc3339 parser and formatter"
end
defp package do
[maintainers: ["alisdair sullivan"],
licenses: ["Apache 2.0", "MIT"],
links: %{"Github" => "https://github.com/talentdeficit/rfc3339"},
files: ["src", "lib", "README.md", "LICENSE*", "mix.exs", "rebar.config"]]
end
defp deps do
[]
end
end

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[].

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{application, rfc3339,
[
{description, "an rfc3339 parser and formatter"},
{vsn, "0.0.1"},
{modules, [rfc3339]},
{registered, []},
{applications, [
kernel,
stdlib
]},
{env, []}
]}.

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-module(rfc3339).
-export([parse/1]).
-export([format/1]).
-export([to_tuple/1]).
-export([to_map/1]).
-export_type([datetime/0, date/0, time/0, tz/0]).
-export_type([year/0, month/0, day/0]).
-export_type([hour/0, min/0, sec/0, usec/0]).
-export_type([tz_offset/0]).
-export_type([(error/0)]).
-type datetime() :: {date(), time(), tz()}.
-type date() :: {year(), month(), day()}.
-type year() :: 0..9999.
-type month() :: 0..12.
-type day() :: 0..31.
-type time() :: {hour(), min(), sec(), usec()}.
-type hour() :: 0..24.
-type min() :: 0..59.
-type sec() :: 0..60.
-type usec() :: 0..999999.
-type tz() :: tz_offset().
-type tz_offset() :: -1439..1439.
-type error() :: map().
-spec parse(binary()) -> {ok, datetime()} | {error, error()}.
parse(Bin) -> time_or_date(Bin, {undefined, undefined, undefined}).
-spec format(map() | datetime()) -> {ok, binary()} | {error, error()}.
format({{Year, Month, Day}, {Hour, Min, Sec, USec}, Offset}) ->
DT = #{year => Year, month => Month, day => Day,
hour => Hour, min => Min, sec => Sec, usec => USec,
tz_offset => Offset},
format(DT);
format(DT) ->
Date = format_date(DT),
Time = format_time(DT),
format(Date, Time).
-spec to_tuple(binary()) -> {ok, datetime()} | {error, error()}.
to_tuple(Bin) -> parse(Bin).
-spec to_map(binary()) -> {ok, map()} | {error, error()}.
to_map(Bin) ->
case parse(Bin) of
{ok, {Date, Time, Offset}} ->
mapify(Date, Time, Offset, #{});
{error, Error} -> {error, Error}
end.
mapify(undefined, Time, Offset, Result) -> mapify(Time, Offset, Result);
mapify({Year, Month, Day}, Time, Offset, Result) ->
mapify(Time, Offset, maps:merge(Result, #{year => Year, month => Month, day => Day})).
mapify(undefined, _, Result) -> Result;
mapify({Hour, Min, Sec, undefined}, Offset, Result) ->
mapify(Offset, maps:merge(Result, #{hour => Hour, min => Min, sec => Sec}));
mapify({Hour, Min, Sec, USec}, Offset, Result) ->
mapify(Offset, maps:merge(Result, #{hour => Hour, min => Min, sec => Sec, usec => USec})).
mapify(undefined, Result) -> Result;
mapify(Offset, Result) ->
maps:merge(Result, #{tz_offset => Offset}).
time_or_date(<<H1, H2, $:, M1, M2, $:, S1, S2, Rest/binary>>, _Result) ->
Hour = to_hour(H1, H2),
Min = to_minute(M1, M2),
Sec = to_second(S1, S2),
usec_or_tz(Rest, {undefined, {Hour, Min, Sec, undefined}, undefined});
time_or_date(<<Y1, Y2, Y3, Y4, $-, M1, M2, $-, D1, D2, Rest/binary>>, _Result) ->
Year = to_year(Y1, Y2, Y3, Y4),
Month = to_month(M1, M2),
Day = to_day(D1, D2, Year, Month),
time_or_end(Rest, {{Year, Month, Day}, undefined, undefined});
time_or_date(_, _Result) ->
{error, badarg}.
usec_or_tz(<<$., Rest/binary>>, Result) ->
usec(Rest, Result, 0, 100000);
usec_or_tz(Rest, Result) -> tz(Rest, Result).
%% next two clauses burn off fractional seconds beyond microsecond precision
usec(<<X, Rest/binary>>, Result, undefined, undefined)
when X >= $0 andalso X =< $9 ->
usec(Rest, Result, undefined, undefined);
usec(Bin, Result, undefined, undefined) ->
tz(Bin, Result);
%% keep a running acc of usecs
usec(<<X, Rest/binary>>, Result, Acc, Multiplier)
when X >= $0 andalso X =< $9 ->
try list_to_integer([X]) of
N -> usec(Rest, Result, Acc + (N * Multiplier), Multiplier div 10)
catch
error:badarg -> {error, badusec}
end;
%% not a digit, insert usecs into time and proceed to tz
usec(Bin, {Date, {Hour, Min, Sec, undefined}, undefined}, Acc, _) ->
tz(Bin, {Date, {Hour, Min, Sec, Acc}, undefined});
usec(_, _, _, _) -> {error, badusec}.
tz(<<$+, H1, H2, $:, M1, M2>>, {Date, Time, undefined}) ->
Hour = to_hour(H1, H2),
Min = to_minute(M1, M2),
{ok, {Date, Time, (Hour * 60) + Min}};
tz(<<$-, H1, H2, $:, M1, M2>>, {Date, Time, undefined}) ->
Hour = to_hour(H1, H2),
Min = to_minute(M1, M2),
{ok, {Date, Time, (Hour * -60) - Min}};
tz(<<$Z>>, Result) ->
{ok, Result};
tz(<<$z>>, Result) ->
{ok, Result};
tz(_, _) -> {error, badtimezone}.
%% space
time_or_end(<<16#20, H1, H2, $:, M1, M2, $:, S1, S2, Rest/binary>>, {Date, undefined, undefined}) ->
Hour = to_hour(H1, H2),
Min = to_minute(M1, M2),
Sec = to_second(S1, S2),
usec_or_tz(Rest, {Date, {Hour, Min, Sec, undefined}, undefined});
time_or_end(<<$t, H1, H2, $:, M1, M2, $:, S1, S2, Rest/binary>>, {Date, undefined, undefined}) ->
Hour = to_hour(H1, H2),
Min = to_minute(M1, M2),
Sec = to_second(S1, S2),
usec_or_tz(Rest, {Date, {Hour, Min, Sec, undefined}, undefined});
time_or_end(<<$T, H1, H2, $:, M1, M2, $:, S1, S2, Rest/binary>>, {Date, undefined, undefined}) ->
Hour = to_hour(H1, H2),
Min = to_minute(M1, M2),
Sec = to_second(S1, S2),
usec_or_tz(Rest, {Date, {Hour, Min, Sec, undefined}, undefined});
time_or_end(<<>>, Result) -> {ok, Result};
time_or_end(_, _) -> {error, badtime}.
to_hour(H1, H2) ->
try list_to_integer([H1, H2]) of
X when X >= 0 andalso X =< 23 -> X;
_ -> {error, badhour}
catch
error:badarg -> {error, badhour}
end.
to_minute(M1, M2) ->
try list_to_integer([M1, M2]) of
X when X >= 0 andalso X =< 59 -> X;
_ -> {error, badminute}
catch
error:badarg -> {error, badminute}
end.
to_second(S1, S2) ->
try list_to_integer([S1, S2]) of
X when X >= 0 andalso X =< 60 -> X;
_ -> {error, badsecond}
catch
error:badarg -> {error, badsecond}
end.
to_year(Y1, Y2, Y3, Y4) ->
try list_to_integer([Y1, Y2, Y3, Y4]) of
X when X >= 0 andalso X =< 9999 -> X;
_ -> {error, badyear}
catch
error:badarg -> {error, badyear}
end.
to_month(M1, M2) ->
try list_to_integer([M1, M2]) of
X when X >= 1 andalso X =< 12 -> X;
_ -> {error, badmonth}
catch
error:badarg -> {error, badmonth}
end.
to_day(D1, D2, Year, Month) ->
try list_to_integer([D1, D2]) of
X when X >= 0 andalso X =< 28 -> X;
X when X >= 29 andalso X =< 31 ->
case day_in_month(Year, Month, X) of
true -> X;
false -> {error, badday}
end;
_ -> {error, badday}
catch
error:badarg -> {error, badday}
end.
day_in_month({error, badyear}, _, _) -> {error, badyear};
day_in_month(_, {error, badmonth}, _) -> {error, badmonth};
day_in_month(Year, Month, Day) ->
case Day of
29 when Month == 2 -> ((Year rem 4 == 0) andalso not (Year rem 100 == 0)) orelse (Year rem 400 == 0);
30 when Month == 2 -> false;
31 when Month == 2; Month == 4; Month == 6; Month == 9; Month == 11 -> false;
_ -> true
end.
format_date(DT) ->
Year = maps:get(year, DT, undefined),
Month = maps:get(month, DT, undefined),
Day = maps:get(day, DT, undefined),
format_date(Year, Month, Day).
format_date(Y, M, D) when is_integer(Y), is_integer(M), is_integer(D) ->
io_lib:format("~4.10.0B-~2.10.0B-~2.10.0B", [Y, M, D]);
format_date(undefined, undefined, undefined) -> {error, nodate};
format_date(nil, nil, nil) -> {error, nodate};
format_date(_, _, _) -> {error, baddate}.
format_time(DT) ->
Hour = maps:get(hour, DT, undefined),
Min = maps:get(min, DT, undefined),
Sec = maps:get(sec, DT, undefined),
USec = maps:get(usec, DT, undefined),
Time = format_time(Hour, Min, Sec, USec),
Offset = maps:get(tz_offset, DT, undefined),
TZ = format_offset(Offset),
format_time(Time, TZ).
format_time(H, M, S, undefined) when is_integer(H), is_integer(M), is_integer(S) ->
io_lib:format("~2.10.0B:~2.10.0B:~2.10.0B", [H, M, S]);
format_time(H, M, S, nil) when is_integer(H), is_integer(M), is_integer(S) ->
io_lib:format("~2.10.0B:~2.10.0B:~2.10.0B", [H, M, S]);
format_time(H, M, S, U) when is_integer(H), is_integer(M), is_integer(S), is_integer(U) ->
SU = (S / 1) + (U / 1000000),
io_lib:format("~2.10.0B:~2.10.0B:~9.6.0f", [H, M, SU]);
format_time(undefined, undefined, undefined, undefined) -> {error, notime};
format_time(nil, nil, nil, nil) -> {error, notime};
format_time(_, _, _, _) -> {error, badtime}.
format_offset(undefined) -> "Z";
format_offset(nil) -> "Z";
format_offset(0) -> "Z";
format_offset(M) when is_integer(M) ->
Sign = case M >= 0 of true -> "+"; false -> "-" end,
Hour = abs(M) div 60,
Min = abs(M) rem 60,
Sign ++ io_lib:format("~2.10.0B:~2.10.0B", [Hour, Min]).
format_time({error, Error}, _) -> {error, Error};
format_time(Time, TZ) -> [Time, TZ].
format({error, baddate}, _) -> {error, badarg};
format(_, {error, badtime}) -> {error, badtime};
format({error, nodate}, {error, notime}) -> {error, badarg};
format({error, nodate}, Time) -> unicode:characters_to_binary(Time);
format(Date, {error, notime}) -> unicode:characters_to_binary(Date);
format(Date, Time) -> unicode:characters_to_binary([Date, "T", Time]).

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defmodule RFC3339Test do
use ExUnit.Case
test "decode 0000-01-01" do
assert %RFC3339{year: 0, month: 1, day: 1} == RFC3339.parse("0000-01-01")
end
test "decode 9999-12-31" do
assert %RFC3339{year: 9999, month: 12, day: 31} == RFC3339.parse("9999-12-31")
end
test "decode 1584-03-04" do
assert %RFC3339{year: 1584, month: 3, day: 4} == RFC3339.parse("1584-03-04")
end
test "decode 1900-01-01" do
assert %RFC3339{year: 1900, month: 1, day: 1} == RFC3339.parse("1900-01-01")
end
test "decode 2016-01-24" do
assert %RFC3339{year: 2016, month: 1, day: 24} == RFC3339.parse("2016-01-24")
end
test "decode 00:00:00Z" do
assert %RFC3339{hour: 0, min: 0, sec: 0} == RFC3339.parse("00:00:00Z")
end
test "decode 23:59:60Z" do
assert %RFC3339{hour: 23, min: 59, sec: 60} == RFC3339.parse("23:59:60Z")
end
test "decode 23:59:60.5Z" do
assert %RFC3339{hour: 23, min: 59, sec: 60, usec: 500000} == RFC3339.parse("23:59:60.5Z")
end
test "decode 23:59:60.55Z" do
assert %RFC3339{hour: 23, min: 59, sec: 60, usec: 550000} == RFC3339.parse("23:59:60.55Z")
end
test "decode 23:59:60.555555Z" do
assert %RFC3339{hour: 23, min: 59, sec: 60, usec: 555555} == RFC3339.parse("23:59:60.555555Z")
end
test "decode 23:59:60.5555554Z" do
assert %RFC3339{hour: 23, min: 59, sec: 60, usec: 555555} == RFC3339.parse("23:59:60.5555554Z")
end
test "decode 23:59:60.999999Z" do
assert %RFC3339{hour: 23, min: 59, sec: 60, usec: 999999} == RFC3339.parse("23:59:60.999999Z")
end
test "decode 23:59:60.9999999Z" do
assert %RFC3339{hour: 23, min: 59, sec: 60, usec: 999999} == RFC3339.parse("23:59:60.9999999Z")
end
test "decode 00:00:00+00:00" do
assert %RFC3339{hour: 0, min: 0, sec: 0, tz_offset: 0} == RFC3339.parse("00:00:00+00:00")
end
test "decode 00:00:00-00:00" do
assert %RFC3339{hour: 0, min: 0, sec: 0, tz_offset: 0} == RFC3339.parse("00:00:00-00:00")
end
test "decode 00:00:00+23:59" do
assert %RFC3339{hour: 0, min: 0, sec: 0, tz_offset: 1439} == RFC3339.parse("00:00:00+23:59")
end
test "decode 23:59:60+00:00" do
assert %RFC3339{hour: 23, min: 59, sec: 60, tz_offset: 0} == RFC3339.parse("23:59:60+00:00")
end
test "decode 23:59:60+23:59" do
assert %RFC3339{hour: 23, min: 59, sec: 60, tz_offset: 1439} == RFC3339.parse("23:59:60+23:59")
end
test "decode 23:59:60-23:59" do
assert %RFC3339{hour: 23, min: 59, sec: 60, tz_offset: -1439} == RFC3339.parse("23:59:60-23:59")
end
test "decode 1979-06-21T22:20:03Z" do
assert %RFC3339{year: 1979, month: 6, day: 21, hour: 22, min: 20, sec: 3} == RFC3339.parse("1979-06-21T22:20:03Z")
end
test "decode 1979-06-21t22:20:03z" do
assert %RFC3339{year: 1979, month: 6, day: 21, hour: 22, min: 20, sec: 3} == RFC3339.parse("1979-06-21t22:20:03z")
end
test "decode 1979-06-21 22:20:03Z" do
assert %RFC3339{year: 1979, month: 6, day: 21, hour: 22, min: 20, sec: 3} == RFC3339.parse("1979-06-21 22:20:03Z")
end
test "decode 1979-06-21T22:20:03.9876543Z" do
assert %RFC3339{year: 1979, month: 6, day: 21, hour: 22, min: 20, sec: 3, usec: 987654} == RFC3339.parse("1979-06-21T22:20:03.9876543Z")
end
test "decode 1979-06-21T22:20:03+02:00" do
assert %RFC3339{year: 1979, month: 6, day: 21, hour: 22, min: 20, sec: 3, tz_offset: 120} == RFC3339.parse("1979-06-21T22:20:03+02:00")
end
test "decode 1979-06-21T22:20:03.9876543+02:00" do
assert %RFC3339{year: 1979, month: 6, day: 21, hour: 22, min: 20, sec: 3, usec: 987654, tz_offset: 120} == RFC3339.parse("1979-06-21T22:20:03.9876543+02:00")
end
test "encode 1979-06-21" do
assert "1979-06-21" == RFC3339.format(%RFC3339{year: 1979, month: 6, day: 21})
end
test "encode 12:12:12Z" do
assert "12:12:12Z" == RFC3339.format(%RFC3339{hour: 12, min: 12, sec: 12})
end
test "encode 12:12:12.120000Z" do
assert "12:12:12.120000Z" == RFC3339.format(%RFC3339{hour: 12, min: 12, sec: 12, usec: 120000})
end
test "encode 12:12:12.000012Z" do
assert "12:12:12.000012Z" == RFC3339.format(%RFC3339{hour: 12, min: 12, sec: 12, usec: 12})
end
test "encode 12:12:12+12:12" do
assert "12:12:12+12:12" == RFC3339.format(%RFC3339{hour: 12, min: 12, sec: 12, tz_offset: 732})
end
test "encode 12:12:12-12:12" do
assert "12:12:12-12:12" == RFC3339.format(%RFC3339{hour: 12, min: 12, sec: 12, tz_offset: -732})
end
test "encode 1979-06-21T12:12:12Z" do
assert "1979-06-21T12:12:12Z" == RFC3339.format(%RFC3339{year: 1979, month: 6, day: 21, hour: 12, min: 12, sec: 12})
end
end

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ExUnit.start()