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expression
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0.1.0
A Excel like expression parser, compatible with FLOIP Expression language.
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lib/date_helpers.ex
defmodule Expression.DateHelpers do
@moduledoc false
import NimbleParsec
def date_separator do
choice([
string("-"),
string("/")
])
end
def us_date do
integer(2)
|> ignore(date_separator())
|> integer(2)
|> ignore(date_separator())
|> integer(4)
end
def us_time do
integer(2)
|> ignore(string(":"))
|> integer(2)
|> optional(ignore(string(":")))
|> optional(integer(2))
end
def us_datetime do
us_date()
|> ignore(string(" "))
|> concat(us_time())
end
def iso_date do
integer(4)
|> ignore(date_separator())
|> integer(2)
|> ignore(date_separator())
|> integer(2)
end
def iso_time do
integer(2)
|> ignore(string(":"))
|> integer(2)
|> ignore(string(":"))
|> integer(2)
|> ignore(optional(string(".")))
|> optional(integer(min: 1))
|> optional(
choice([
ignore(string("+")) |> integer(min: 1),
string("Z") |> replace(0)
])
)
end
def iso_datetime do
iso_date()
|> ignore(string("T"))
|> concat(iso_time())
end
def date do
choice([
tag(us_date(), :us_format),
tag(iso_date(), :iso_format)
])
|> reduce(:to_date)
end
def datetime do
choice([
tag(us_datetime(), :us_format),
tag(iso_datetime(), :iso_format)
])
|> reduce(:to_date)
end
def to_date(opts) do
values =
case opts do
[iso_format: parsed_value] ->
values =
[:year, :month, :day, :hour, :minute, :second, :microsecond, :utc_offset]
|> Enum.zip(parsed_value)
{microseconds, values} = Keyword.pop(values, :microsecond, 0)
microsecond_entry =
{microseconds,
microseconds
|> to_string()
|> String.length()}
Keyword.put(values, :microsecond, microsecond_entry)
[us_format: parsed_value] ->
[:day, :month, :year, :hour, :minute, :second]
|> Enum.zip(parsed_value)
end
fields =
[
calendar: Calendar.ISO,
hour: 0,
minute: 0,
second: 0,
time_zone: "Etc/UTC",
zone_abbr: "UTC",
utc_offset: 0,
std_offset: 0
]
|> Keyword.merge(values)
struct(DateTime, fields)
end
end