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Common Locale Data Repository (CLDR) functions for Elixir to localize and format numbers, dates, lists, messages, languages, territories and units with support for over 700 locales for internationalized (i18n) and localized (L10N) applications.
Retired package: Deprecated
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lib/cldr/number/system.ex
defmodule Cldr.Number.System do
@moduledoc """
A number system defines the digits (if they exist in this number system) or
or rules (if the number system does not have decimal digits).
The system name is also used as a key to define the separators that are used
when formatting a number is this number_system. See
`Cldr.Number.Symbol.number_symbols_for/2`.
"""
alias Cldr.Locale
alias Cldr.Number.Symbol
@default_number_system_type :default
@number_system_types [:default, :native, :traditional, :finance]
@type name :: atom
@type types :: :default | :native | :traditional | :finance
@doc """
Return the default number system type name.
Currently this is `:default`. Note that this is
not the number system itself but the type of the
number system. It can be used to find the
default number system for a given locale with
`number_systems_for(locale)[default_number_system()]`.
## Example
iex> Cldr.Number.System.default_number_system_type
:default
"""
def default_number_system_type do
@default_number_system_type
end
@doc """
Returns a list of the known number system types.
Note that not all locales support all number system types.
`:default` is available for all locales, the other types
configured only in certain locales.
## Example
iex> Cldr.Number.System.number_system_types
[:default, :native, :traditional, :finance]
"""
def number_system_types do
@number_system_types
end
@doc """
Return a map of all CLDR number systems and definitions.
## Example
iex> Cldr.Number.System.number_systems |> Enum.count
77
"""
@spec number_systems :: %{}
@number_systems Path.join(Cldr.Config.cldr_data_dir(), "number_systems.json")
|> File.read!
|> Poison.decode!
|> Cldr.Map.atomize_keys
|> Enum.map(fn {k, v} -> {k, %{v | type: String.to_atom(v.type)}} end)
|> Enum.into(%{})
def number_systems do
@number_systems
end
@doc """
The unique Cldr number systems names,
## Example
iex> Cldr.Number.System.number_system_names
[:adlm, :ahom, :arab, :arabext, :armn, :armnlow, :bali,
:beng, :bhks, :brah, :cakm, :cham, :cyrl, :deva, :ethi,
:fullwide, :geor, :grek, :greklow, :gujr, :guru, :hanidays,
:hanidec, :hans, :hansfin, :hant, :hantfin, :hebr, :hmng,
:java, :jpan, :jpanfin, :kali, :khmr, :knda, :lana, :lanatham,
:laoo, :latn, :lepc, :limb, :mathbold, :mathdbl, :mathmono,
:mathsanb, :mathsans, :mlym, :modi, :mong, :mroo, :mtei,
:mymr, :mymrshan, :mymrtlng, :newa, :nkoo, :olck, :orya,
:osma, :roman, :romanlow, :saur, :shrd, :sind, :sinh, :sora,
:sund, :takr, :talu, :taml, :tamldec, :telu, :thai, :tibt,
:tirh, :vaii, :wara]
"""
@number_system_names @number_systems |> Map.keys |> Enum.sort
@spec number_system_names :: [String.t]
def number_system_names do
@number_system_names
end
@systems_with_digits Enum.reject @number_systems, fn {_name, system} ->
is_nil(system[:digits])
end
@doc """
Number systems that have their own digit characters defined.
"""
def systems_with_digits do
@systems_with_digits
end
@doc """
Returns the number systems available for a locale.
## Examples
iex> Cldr.Number.System.number_systems_for "en"
%{default: :latn, native: :latn}
iex> Cldr.Number.System.number_systems_for "th"
%{default: :latn, native: :thai}
"""
@spec number_systems_for(Cldr.locale) :: %{}
def number_systems_for(locale) do
Locale.get_locale(locale)[:number_systems]
end
@spec number_system_names_for(Cldr.locale) :: [String.t]
def number_system_names_for(locale) do
Locale.get_locale(locale)[:number_systems]
|> Map.values
|> Enum.uniq
end
def number_system_for(locale, system_name) do
system_name = system_name_from(system_name, locale)
number_systems()[system_name]
end
@doc """
Returns a number system name for a given locale and number system reference.
* `system_name` is any name of name type
* `locale` is any valid locale returned by `Cldr.known_locales()`
Number systems can be references in one of two ways:
* As a number system type such as :default, :native, :traditional and
:finance. This allows references to a number system for a locale in a
consistent fashion for a given use
* WIth the number system name directly, such as :latn, :arab or any of the
other 70 or so
This function dereferences the supplied `system_name` and returns the
actual system name.
## Examples
ex> Cldr.Number.System.system_name_from(:default, "en")
:latn
iex> Cldr.Number.System.system_name_from("latn", "en")
:latn
iex> Cldr.Number.System.system_name_from(:finance, "en")
:finance
Note that return value is not guaranteed to be a valid
number system for the given locale as demonstrated in the third example.
"""
def system_name_from(system_name, locale \\ Cldr.get_locale())
def system_name_from(system_name, locale) when is_binary(system_name) do
try do
system_name_from(String.to_existing_atom(system_name), locale)
rescue
ArgumentError ->
raise Cldr.UnknownLocaleError,
"The requested number system #{inspect system_name} is not known."
end
end
def system_name_from(system_name, locale) when is_atom(system_name) do
if system = number_systems_for(locale)[system_name] do
system
else
system_name
end
end
@doc """
Returns locale and number systems that have the same digits and
separators as the supplied one.
Transliterating between locale & number systems is expensive. To avoid
unncessary transliteration we look for locale and number systems that have
the same digits and separators. Typically we are comparing to locale "en"
and number system "latn" since this is what the number formatting routines use
as placeholders.
"""
# @lint {Credo.Check.Refactor.Nesting, false}
def number_systems_like(locale, number_system) do
digits = number_system_for(locale, number_system)[:digits]
symbols = Symbol.number_symbols_for(locale, number_system)
likes = Enum.map(Cldr.known_locales(), fn this_locale ->
Enum.reduce number_system_names_for(locale), [], fn this_system, acc ->
case number_system_for(this_locale, this_system) do
nil ->
acc
system ->
these_digits = system.digits
these_symbols = Symbol.number_symbols_for(this_locale, this_system)
if digits == these_digits && symbols == these_symbols do
acc ++ {this_locale, this_system}
end
end
end
end)
likes |> Enum.reject(&(is_nil(&1) || &1 == []))
end
end