@spec number_system_for(
  Cldr.Locale.locale_reference(),
  Cldr.Number.System.system_name()
) ::
  {:ok, [atom()]} | {:error, {module(), String.t()}}

Returns the actual number system from a number system type.

• locale is any valid locale name returned by Cldr.known_locale_names/0 or a Cldr.LanguageTag struct returned by Cldr.Locale.new!/2

• system_name is any number system name returned by Cldr.known_number_systems/0 or a number system type returned by Cldr.known_number_system_types/0

This function will decode a number system type into the actual number system. If the number system provided can't be decoded it is returned as is.

Examples

iex> Plausible.Cldr.Number.System.number_system_for "th", :latn
{:ok, %{digits: "0123456789", type: :numeric}}

iex> Plausible.Cldr.Number.System.number_system_for "en", :default
{:ok, %{digits: "0123456789", type: :numeric}}

iex> Plausible.Cldr.Number.System.number_system_for "he", :traditional
{:ok, %{rules: "hebrew", type: :algorithmic}}

iex> Plausible.Cldr.Number.System.number_system_for "en", :native
{:ok, %{digits: "0123456789", type: :numeric}}

iex> Plausible.Cldr.Number.System.number_system_for "en", :finance
{
  :error,
  {Cldr.UnknownNumberSystemError,
    "The number system :finance is unknown for the locale named :en. Valid number systems are %{default: :latn, native: :latn}"}
}

@spec number_system_from_locale(Cldr.Locale.locale_reference()) ::
  Cldr.Number.System.system_name()

Returns the number system from a language tag or locale name.

Arguments

• locale is any language tag returned be Cldr.Locale.new/2 or a locale name in the list returned by Cldr.known_locale_names/1

Returns

• A number system name as an atom

Examples

iex> Plausible.Cldr.Number.System.number_system_from_locale "en-US-u-nu-thai"
:thai

iex> Plausible.Cldr.Number.System.number_system_from_locale "en-US"
:latn

@spec number_system_names_for(Cldr.Locale.locale_reference()) ::
  {:ok, [atom()]} | {:error, {module(), String.t()}}

Returns the number systems available for a locale or {:error, message} if the locale is not known.

• locale is any valid locale name returned by Plausible.Cldr.known_locale_names/0 or a Cldr.LanguageTag struct returned by Plausible.Cldr.Locale.new!/1

Examples

iex> Plausible.Cldr.Number.System.number_system_names_for "en"
{:ok, [:latn]}

iex> Plausible.Cldr.Number.System.number_system_names_for "zz"
{:error, {Cldr.InvalidLanguageError, "The language \"zz\" is invalid"}}

@spec number_systems_for(Cldr.Locale.locale_reference()) ::
  {:ok, map()} | {:error, {module(), String.t()}}

Returns the number systems available for a locale or {:error, message} if the locale is not known.

• locale is any valid locale name returned by Plausible.Cldr.known_locale_names/0 or a Cldr.LanguageTag struct returned by Plausible.Cldr.Locale.new!/1

Examples

iex> Plausible.Cldr.Number.System.number_systems_for "en"
{:ok, %{default: :latn, native: :latn}}

iex> Plausible.Cldr.Number.System.number_systems_for "th"
{:ok, %{default: :latn, native: :thai}}

iex> Plausible.Cldr.Number.System.number_systems_for "zz"
{:error, {Cldr.InvalidLanguageError, "The language \"zz\" is invalid"}}

@spec system_name_from(
  Cldr.Number.System.system_name(),
  Cldr.Locale.locale_reference()
) ::
  {:ok, Cldr.Number.System.system_name()} | {:error, {module(), String.t()}}

Returns a number system name for a given locale and number system reference.

• system_name is any number system name returned by Plausible.Cldr.known_number_systems/0 or a number system type returned by Plausible.Cldr.known_number_system_types/0

• locale is any valid locale name returned by Plausible.Cldr.known_locale_names/0 or a Cldr.LanguageTag struct returned by Plausible.Cldr.Locale.new!/1

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> Plausible.Cldr.Number.System.system_name_from(:default, "en")
{:ok, :latn}

iex> Plausible.Cldr.Number.System.system_name_from("latn", "en")
{:ok, :latn}

iex> Plausible.Cldr.Number.System.system_name_from(:native, "en")
{:ok, :latn}

iex> Plausible.Cldr.Number.System.system_name_from(:nope, "en")
{
  :error,
  {Cldr.UnknownNumberSystemError, "The number system :nope is unknown"}
}

Note that return value is not guaranteed to be a valid number system for the given locale as demonstrated in the third example.

Converts a number into the representation of a non-latin number system.

This function converts numbers to a known number system only, it does not provide number formatting.

• number is a float, integer or Decimal

• system_name is any number system name returned by Cldr.known_number_systems/0 or a number system type returned by Cldr.known_number_system_types/0

There are two types of number systems in CLDR:

• :numeric in which the number system defines a direct mapping between the latin digits 0..9 into a the number system equivalent. In this case, to_system/2 invokes Cldr.Number.Transliterate.transliterate_digits/3 for the given number.

• :algorithmic in which the number system does not have the same structure as the :latn number system and therefore the conversion is done algorithmically. For CLDR the algorithm is implemented through Cldr.Rbnf rulesets. These rulesets are considered by CLDR to be less rigorous than the :numeric number systems and caution and testing for a specific use case is recommended.

Examples

iex> Plausible.Cldr.Number.System.to_system 123456, :hebr
{:ok, "קכ״ג׳תנ״ו"}

iex> Plausible.Cldr.Number.System.to_system 123, :hans
{:ok, "一百二十三"}

iex> Plausible.Cldr.Number.System.to_system 123, :hant
{:ok, "一百二十三"}

iex> Plausible.Cldr.Number.System.to_system 123, :hansfin
{:ok, "壹佰贰拾叁"}

Converts a number into the representation of a non-latin number system. Returns a converted string or raises on error.

• number is a float, integer or Decimal

• system_name is any number system name returned by Plausible.Cldr.known_number_systems/0 or a number system type returned by Plausible.Cldr.known_number_system_types/0

See Plausible.Cldr.Number.System.to_system/2 for further information.

Examples

iex> Plausible.Cldr.Number.System.to_system! 123, :hans
"一百二十三"

iex> Plausible.Cldr.Number.System.to_system! 123, :hant
"一百二十三"

iex> Plausible.Cldr.Number.System.to_system! 123, :hansfin
"壹佰贰拾叁"