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Robust job processing, backed by modern PostgreSQL, SQLite3, and MySQL.
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lib/oban/crontab/parser.ex.exs
defmodule Oban.Crontab.Parser do
@moduledoc false
# parsec:Oban.Crontab.Parser
import NimbleParsec
month_alias =
[
replace(string("JAN"), 1),
replace(string("FEB"), 2),
replace(string("MAR"), 3),
replace(string("APR"), 4),
replace(string("MAY"), 5),
replace(string("JUN"), 6),
replace(string("JUL"), 7),
replace(string("AUG"), 8),
replace(string("SEP"), 9),
replace(string("OCT"), 10),
replace(string("NOV"), 11),
replace(string("DEC"), 12)
]
|> choice()
|> unwrap_and_tag(:literal)
weekday_alias =
[
replace(string("MON"), 1),
replace(string("TUE"), 2),
replace(string("WED"), 3),
replace(string("THU"), 4),
replace(string("FRI"), 5),
replace(string("SAT"), 6),
replace(string("SUN"), 0)
]
|> choice()
|> unwrap_and_tag(:literal)
range =
integer(min: 1, max: 2)
|> ignore(string("-"))
|> integer(min: 1, max: 2)
|> tag(:range)
step =
string("*/")
|> ignore()
|> integer(min: 1, max: 2)
|> unwrap_and_tag(:step)
literal = integer(min: 1, max: 2) |> unwrap_and_tag(:literal)
wild = string("*") |> unwrap_and_tag(:wild)
separator = string(",") |> ignore()
expression = choice([range, literal, step, wild, separator])
minutes =
expression
|> times(min: 1)
|> tag(:minutes)
hours =
expression
|> times(min: 1)
|> tag(:hours)
days =
expression
|> times(min: 1)
|> tag(:days)
months =
[month_alias, expression]
|> choice()
|> times(min: 1)
|> tag(:months)
weekdays =
[weekday_alias, expression]
|> choice()
|> times(min: 1)
|> tag(:weekdays)
whitespace = ascii_string([?\s, ?\t], min: 1)
defparsec(
:cron,
minutes
|> ignore(whitespace)
|> concat(hours)
|> ignore(whitespace)
|> concat(days)
|> ignore(whitespace)
|> concat(months)
|> ignore(whitespace)
|> concat(weekdays)
)
# parsec:Oban.Crontab.Parser
end