Source file date0.ml
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open! Import
open Std_internal
open Digit_string_helpers
let is_leap_year ~year = (year mod 4 = 0 && not (year mod 100 = 0)) || year mod 400 = 0
module Stable = struct
module V1 = struct
module Without_comparable = struct
module T : sig
type t
[@@immediate]
[@@deriving bin_io ~localize, compare, equal, hash, typerep, stable_witness]
val create_exn : y:int -> m:Month.Stable.V1.t -> d:int -> t
val year : t -> int
val month : t -> Month.Stable.V1.t
val day : t -> int
val days_in_month : year:int -> month:Month.t -> int
val to_int : t -> int
val of_int_exn : int -> t
val of_int_unchecked : int -> t
val invalid_value__for_internal_use_only : t
end = struct
type t = int
[@@deriving
compare
, equal
, hash
, typerep
, bin_shape ~basetype:"899ee3e0-490a-11e6-a10a-a3734f733566"
, stable_witness]
let create0 ~year ~month ~day =
(year lsl 16) lor (Month.to_int month lsl 8) lor day
;;
let of_int_unchecked t = t
let year t = t lsr 16
let month t = Month.of_int_exn ((t lsr 8) land 0xff)
let day t = t land 0xff
let days_in_month ~year ~month =
match (month : Month.t) with
| Jan | Mar | May | Jul | Aug | Oct | Dec -> 31
| Apr | Jun | Sep | Nov -> 30
| Feb -> if is_leap_year ~year then 29 else 28
;;
let create_exn ~y:year ~m:month ~d:day =
let invalid ~year ~month ~day msg =
invalid_argf
!"Date.create_exn ~y:%d ~m:%{Month} ~d:%d error: %s"
year
month
day
msg
()
in
if year < 0 || year > 9999
then invalid ~year ~month ~day "year outside of [0..9999]";
if day <= 0 then invalid ~year ~month ~day "day <= 0";
let days_in_month = days_in_month ~year ~month in
if day > days_in_month
then invalid ~year ~month ~day (sprintf "%d day month violation" days_in_month);
create0 ~year ~month ~day
;;
let bin_read_t buf ~pos_ref =
let year = Int.bin_read_t buf ~pos_ref in
let month = Month.Stable.V1.bin_read_t buf ~pos_ref in
let day = Int.bin_read_t buf ~pos_ref in
create0 ~year ~month ~day
;;
let __bin_read_t__ _buf ~pos_ref =
Bin_prot.Common.raise_variant_wrong_type "Date.t" !pos_ref
;;
let bin_reader_t =
{ Bin_prot.Type_class.read = bin_read_t; vtag_read = __bin_read_t__ }
;;
let bin_size_t__local t =
Int.bin_size_t (year t) + Month.bin_size_t (month t) + Int.bin_size_t (day t)
;;
let bin_size_t t = bin_size_t__local t
let bin_write_t__local buf ~pos t =
let pos = Int.bin_write_t buf ~pos (year t) in
let pos = Month.bin_write_t buf ~pos (month t) in
Int.bin_write_t buf ~pos (day t)
;;
let bin_write_t buf ~pos t = bin_write_t__local buf ~pos t
let bin_writer_t = { Bin_prot.Type_class.size = bin_size_t; write = bin_write_t }
let bin_t =
{ Bin_prot.Type_class.reader = bin_reader_t
; writer = bin_writer_t
; shape = bin_shape_t
}
;;
let to_int t = t
let of_int_exn n = create_exn ~y:(year n) ~m:(month n) ~d:(day n)
let invalid_value__for_internal_use_only = 0
let%test "invalid value" =
Exn.does_raise (fun () : t -> of_int_exn invalid_value__for_internal_use_only)
;;
end
include T
(** YYYY-MM-DD *)
let to_string_iso8601_extended t =
let buf = Bytes.create 10 in
write_4_digit_int buf ~pos:0 (year t);
Bytes.set buf 4 '-';
write_2_digit_int buf ~pos:5 (Month.to_int (month t));
Bytes.set buf 7 '-';
write_2_digit_int buf ~pos:8 (day t);
Bytes.unsafe_to_string ~no_mutation_while_string_reachable:buf
;;
let to_string = to_string_iso8601_extended
(** YYYYMMDD *)
let to_string_iso8601_basic t =
let buf = Bytes.create 8 in
write_4_digit_int buf ~pos:0 (year t);
write_2_digit_int buf ~pos:4 (Month.to_int (month t));
write_2_digit_int buf ~pos:6 (day t);
Bytes.unsafe_to_string ~no_mutation_while_string_reachable:buf
;;
(** MM/DD/YYYY *)
let to_string_american t =
let buf = Bytes.create 10 in
write_2_digit_int buf ~pos:0 (Month.to_int (month t));
Bytes.set buf 2 '/';
write_2_digit_int buf ~pos:3 (day t);
Bytes.set buf 5 '/';
write_4_digit_int buf ~pos:6 (year t);
Bytes.unsafe_to_string ~no_mutation_while_string_reachable:buf
;;
let parse_year4 str pos = read_4_digit_int str ~pos
let parse_month str pos = Month.of_int_exn (read_2_digit_int str ~pos)
let parse_day str pos = read_2_digit_int str ~pos
(** YYYYMMDD *)
let of_string_iso8601_basic str ~pos =
if pos + 8 > String.length str
then invalid_arg "Date.of_string_iso8601_basic: pos + 8 > string length";
create_exn
~y:(parse_year4 str pos)
~m:(parse_month str (pos + 4))
~d:(parse_day str (pos + 6))
;;
let of_string s =
let invalid () = failwith ("invalid date: " ^ s) in
let ensure b = if not b then invalid () in
let month_num ~year ~month ~day =
create_exn ~y:(parse_year4 s year) ~m:(parse_month s month) ~d:(parse_day s day)
in
let month_abrv ~year ~month ~day =
create_exn
~y:(parse_year4 s year)
~m:(Month.of_string (String.sub s ~pos:month ~len:3))
~d:(parse_day s day)
in
if String.contains s '/'
then (
let y, m, d =
match String.split s ~on:'/' with
| [ a; b; c ] ->
if String.length a = 4 then a, b, c else c, a, b
| _ -> invalid ()
in
let year = Int.of_string y in
let year =
if year >= 100 then year else if year < 75 then 2000 + year else 1900 + year
in
let month = Month.of_int_exn (Int.of_string m) in
let day = Int.of_string d in
create_exn ~y:year ~m:month ~d:day)
else if String.contains s '-'
then (
ensure (String.length s = 10 && Char.( = ) s.[4] '-' && Char.( = ) s.[7] '-');
month_num ~year:0 ~month:5 ~day:8)
else if String.contains s ' '
then
if String.length s = 11 && Char.( = ) s.[2] ' ' && Char.( = ) s.[6] ' '
then
month_abrv ~day:0 ~month:3 ~year:7
else (
ensure (String.length s = 11 && Char.( = ) s.[4] ' ' && Char.( = ) s.[8] ' ');
month_abrv ~day:9 ~month:5 ~year:0)
else if String.length s = 9
then
month_abrv ~day:0 ~month:2 ~year:5
else if String.length s = 8
then
month_num ~year:0 ~month:4 ~day:6
else invalid ()
;;
let of_string s =
try of_string s with
| exn -> invalid_argf "Date.of_string (%s): %s" s (Exn.to_string exn) ()
;;
module Sexpable = struct
module Old_date = struct
type t =
{ y : int
; m : int
; d : int
}
[@@deriving sexp]
let to_date t = T.create_exn ~y:t.y ~m:(Month.of_int_exn t.m) ~d:t.d
end
let t_of_sexp = function
| Sexp.Atom s -> of_string s
| Sexp.List _ as sexp -> Old_date.to_date (Old_date.t_of_sexp sexp)
;;
let t_of_sexp s =
try t_of_sexp s with
| Of_sexp_error _ as exn -> raise exn
| Invalid_argument a -> of_sexp_error a s
;;
let sexp_of_t t = Sexp.Atom (to_string t)
let t_sexp_grammar =
let open Sexplib in
Sexp_grammar.tag
(Sexp_grammar.coerce String.t_sexp_grammar : t Sexp_grammar.t)
~key:Sexp_grammar.type_name_tag
~value:(Atom "Core.Date.t")
;;
end
include Sexpable
include (val Comparator.Stable.V1.make ~compare ~sexp_of_t)
end
include Without_comparable
include Comparable.Stable.V1.With_stable_witness.Make (Without_comparable)
include Hashable.Stable.V1.With_stable_witness.Make (Without_comparable)
include Diffable.Atomic.Make (Without_comparable)
end
module Option = struct
module V1 = struct
type t = int
[@@deriving
bin_io ~localize
, bin_shape ~basetype:"826a3e79-3321-451a-9707-ed6c03b84e2f"
, compare
, equal
, hash
, typerep
, stable_witness]
let none = V1.(to_int invalid_value__for_internal_use_only)
let is_none t = t = none
let is_some t = not (is_none t)
let some_is_representable _ = true
let some t = V1.to_int t
let unchecked_value = V1.of_int_unchecked
let to_option t = if is_some t then Some (unchecked_value t) else None
let of_option opt =
match opt with
| None -> none
| Some v -> some v
;;
let value_exn t =
if is_some t
then unchecked_value t
else raise_s [%message [%here] "Date.Option.value_exn none"]
;;
let value t ~default = Bool.select (is_none t) default (unchecked_value t)
let sexp_of_t t = to_option t |> Option.sexp_of_t V1.sexp_of_t
let t_of_sexp sexp = (Option.t_of_sexp V1.t_of_sexp) sexp |> of_option
let t_sexp_grammar = Sexplib.Sexp_grammar.coerce [%sexp_grammar: V1.t Option.t]
let of_int_exn t =
if t = none then none else some (V1.of_int_exn t)
;;
let to_int t = t
end
end
end
module Without_comparable = Stable.V1.Without_comparable
include Without_comparable
module C = Comparable.Make_binable_using_comparator (Without_comparable)
include C
include Diffable.Atomic.Make (struct
include Without_comparable
include C
end)
module O = struct
include (C : Comparable.Infix with type t := t)
end
include (
Hashable.Make_binable (struct
include T
include Sexpable
include Binable
let compare (a : t) (b : t) = compare a b
end) :
Hashable.S_binable with type t := t)
include Pretty_printer.Register (struct
type nonrec t = t
let module_name = "Core.Date"
let to_string = to_string
end)
let unix_epoch = create_exn ~y:1970 ~m:Jan ~d:1
module Days : sig
type date = t
type t [@@immediate]
val of_date : date -> t
val to_date : t -> date
val diff : t -> t -> int
val add_days : t -> int -> t
val unix_epoch : t
end
with type date := t = struct
open Int
type t = int
let of_year y = (365 * y) + (y / 4) - (y / 100) + (y / 400)
let of_date date =
let m = (Month.to_int (month date) + 9) % 12 in
let y = year date - (m / 10) in
of_year y + (((m * 306) + 5) / 10) + (day date - 1)
;;
let c_10_000 = Int63.of_int 10_000
let c_14_780 = Int63.of_int 14_780
let c_3_652_425 = Int63.of_int 3_652_425
let to_date days =
let y =
let open Int63 in
to_int_exn (((c_10_000 * of_int days) + c_14_780) / c_3_652_425)
in
let ddd = days - of_year y in
let y, ddd =
if ddd < 0
then (
let y = y - 1 in
y, days - of_year y)
else y, ddd
in
let mi = ((100 * ddd) + 52) / 3_060 in
let y = y + ((mi + 2) / 12) in
let m = ((mi + 2) % 12) + 1 in
let d = ddd - (((mi * 306) + 5) / 10) + 1 in
create_exn ~y ~m:(Month.of_int_exn m) ~d
;;
let unix_epoch = of_date unix_epoch
let add_days t days = t + days
let diff t1 t2 = t1 - t2
end
let add_days t days = Days.to_date (Days.add_days (Days.of_date t) days)
let diff t1 t2 = Days.diff (Days.of_date t1) (Days.of_date t2)
let add_months t n =
let total_months = Month.to_int (month t) + n in
let y = year t + (total_months /% 12) in
let m = total_months % 12 in
let y, m = if Int.( = ) m 0 then y - 1, m + 12 else y, m in
let m = Month.of_int_exn m in
let rec try_create d =
try create_exn ~y ~m ~d with
| _exn ->
assert (Int.( >= ) d 1);
try_create (d - 1)
in
try_create (day t)
;;
let add_years t n = add_months t (n * 12)
let day_of_week =
let table = [| 0; 3; 2; 5; 0; 3; 5; 1; 4; 6; 2; 4 |] in
fun t ->
let m = Month.to_int (month t) in
let y = if Int.( < ) m 3 then year t - 1 else year t in
Day_of_week.of_int_exn
((y + (y / 4) - (y / 100) + (y / 400) + table.(m - 1) + day t) % 7)
;;
let non_leap_year_table = [| 0; 31; 59; 90; 120; 151; 181; 212; 243; 273; 304; 334 |]
let leap_year_table = [| 0; 31; 60; 91; 121; 152; 182; 213; 244; 274; 305; 335 |]
let ordinal_date t =
let table =
if is_leap_year ~year:(year t) then leap_year_table else non_leap_year_table
in
let offset = table.(Month.to_int (month t) - 1) in
day t + offset
;;
let last_week_of_year y =
let first_of_year = create_exn ~y ~m:Jan ~d:1 in
let is t day = Day_of_week.equal (day_of_week t) day in
if is first_of_year Thu || (is_leap_year ~year:y && is first_of_year Wed)
then 53
else 52
;;
let call_with_week_and_year t ~f =
let ordinal = ordinal_date t in
let weekday = Day_of_week.iso_8601_weekday_number (day_of_week t) in
let week = (ordinal - weekday + 10) / 7 in
let year = year t in
if Int.( < ) week 1
then f ~week:(last_week_of_year (year - 1)) ~year:(year - 1)
else if Int.( > ) week (last_week_of_year year)
then f ~week:1 ~year:(year + 1)
else f ~week ~year
;;
let week_number_and_year t = call_with_week_and_year t ~f:(fun ~week ~year -> week, year)
let week_number t = call_with_week_and_year t ~f:(fun ~week ~year:_ -> week)
let is_weekend t = Day_of_week.is_sun_or_sat (day_of_week t)
let is_weekday t = not (is_weekend t)
let is_business_day t ~is_holiday = is_weekday t && not (is_holiday t)
let rec diff_weekend_days t1 t2 =
if t1 < t2
then -diff_weekend_days t2 t1
else (
let diff = diff t1 t2 in
let d1 = day_of_week t1 in
let d2 = day_of_week t2 in
let num_satsun_crossings =
if Int.( < ) (Day_of_week.to_int d1) (Day_of_week.to_int d2)
then 1 + (diff / 7)
else diff / 7
in
(num_satsun_crossings * 2)
+ (if Day_of_week.( = ) d2 Day_of_week.Sun then 1 else 0)
+ if Day_of_week.( = ) d1 Day_of_week.Sun then -1 else 0)
;;
let diff_weekdays t1 t2 = diff t1 t2 - diff_weekend_days t1 t2
let add_days_skipping t ~skip n =
let step = if Int.( >= ) n 0 then 1 else -1 in
let rec loop t k =
let t_next = add_days t step in
if skip t then loop t_next k else if Int.( = ) k 0 then t else loop t_next (k - 1)
in
loop t (abs n)
;;
let rec first_day_satisfying t ~step ~condition =
if condition t then t else first_day_satisfying (add_days t step) ~step ~condition
;;
let next_day_satisfying t ~step ~condition =
let next_day = add_days t step in
first_day_satisfying next_day ~step ~condition
;;
let following_weekday t = next_day_satisfying t ~step:1 ~condition:is_weekday
let previous_weekday t = next_day_satisfying t ~step:(-1) ~condition:is_weekday
let round_forward_to_weekday t = first_day_satisfying t ~step:1 ~condition:is_weekday
let round_backward_to_weekday t = first_day_satisfying t ~step:(-1) ~condition:is_weekday
let round_forward_to_business_day t ~is_holiday =
first_day_satisfying t ~step:1 ~condition:(is_business_day ~is_holiday)
;;
let round_backward_to_business_day t ~is_holiday =
first_day_satisfying t ~step:(-1) ~condition:(is_business_day ~is_holiday)
;;
let add_weekdays t n = add_days_skipping t ~skip:is_weekend n
let add_weekdays_rounding_in_direction_of_step = add_weekdays
let add_weekdays_rounding_forward t n =
add_days_skipping (round_forward_to_weekday t) ~skip:is_weekend n
;;
let add_weekdays_rounding_backward t n =
add_days_skipping (round_backward_to_weekday t) ~skip:is_weekend n
;;
let add_business_days t ~is_holiday n =
add_days_skipping t n ~skip:(fun d -> is_weekend d || is_holiday d)
;;
let add_business_days_rounding_in_direction_of_step = add_business_days
let add_business_days_rounding_forward t ~is_holiday n =
add_days_skipping (round_forward_to_business_day ~is_holiday t) n ~skip:(fun d ->
not (is_business_day ~is_holiday d))
;;
let add_business_days_rounding_backward t ~is_holiday n =
add_days_skipping (round_backward_to_business_day ~is_holiday t) n ~skip:(fun d ->
not (is_business_day ~is_holiday d))
;;
let dates_between ~min:t1 ~max:t2 =
let rec loop t l = if t < t1 then l else loop (add_days t (-1)) (t :: l) in
loop t2 []
;;
let weekdays_between ~min ~max =
let all_dates = dates_between ~min ~max in
Option.value_map (List.hd all_dates) ~default:[] ~f:(fun first_date ->
let first_weekday = day_of_week first_date in
let date_and_weekdays =
List.mapi all_dates ~f:(fun i date -> date, Day_of_week.shift first_weekday i)
in
List.filter_map date_and_weekdays ~f:(fun (date, weekday) ->
if Day_of_week.is_sun_or_sat weekday then None else Some date))
;;
let business_dates_between ~min ~max ~is_holiday =
weekdays_between ~min ~max |> List.filter ~f:(fun d -> not (is_holiday d))
;;
let first_strictly_after t ~on:dow =
let dow = Day_of_week.to_int dow in
let tplus1 = add_days t 1 in
let cur = Day_of_week.to_int (day_of_week tplus1) in
let diff = (dow + 7 - cur) mod 7 in
add_days tplus1 diff
;;
module For_quickcheck = struct
open Quickcheck
let gen_uniform_incl d1 d2 =
if d1 > d2
then
raise_s
[%message
"Date.gen_uniform_incl: bounds are crossed"
~lower_bound:(d1 : t)
~upper_bound:(d2 : t)];
Generator.map (Int.gen_uniform_incl 0 (diff d2 d1)) ~f:(fun days -> add_days d1 days)
;;
let gen_incl d1 d2 =
Generator.weighted_union
[ 1., Generator.return d1; 1., Generator.return d2; 18., gen_uniform_incl d1 d2 ]
;;
let quickcheck_generator = gen_incl (of_string "1900-01-01") (of_string "2100-01-01")
let quickcheck_observer = Observer.create (fun t ~size:_ ~hash -> hash_fold_t hash t)
let quickcheck_shrinker = Shrinker.empty ()
end
let quickcheck_generator = For_quickcheck.quickcheck_generator
let gen_incl = For_quickcheck.gen_incl
let gen_uniform_incl = For_quickcheck.gen_uniform_incl
let quickcheck_observer = For_quickcheck.quickcheck_observer
let quickcheck_shrinker = For_quickcheck.quickcheck_shrinker
module Private = struct
let leap_year_table = leap_year_table
let non_leap_year_table = non_leap_year_table
let ordinal_date = ordinal_date
end
module Option = struct
module Stable = Stable.Option
include Stable.V1
module Optional_syntax = struct
module Optional_syntax = struct
let is_none = is_none
let unsafe_value = unchecked_value
end
end
let quickcheck_generator =
Quickcheck.Generator.map
(Option.quickcheck_generator quickcheck_generator)
~f:of_option
;;
let quickcheck_shrinker =
Quickcheck.Shrinker.map
(Option.quickcheck_shrinker quickcheck_shrinker)
~f:of_option
~f_inverse:to_option
;;
let quickcheck_observer =
Quickcheck.Observer.of_hash
(module struct
type nonrec t = t [@@deriving hash]
end)
;;
include Comparable.Make_plain (struct
type nonrec t = t [@@deriving compare, sexp_of]
end)
end