Specs

resolve_currency(String.t(), Keyword.t()) ::
  Cldr.Currency.code()
  | [Cldr.Currency.code() | String.t()]
  | {:error, {module(), String.t()}}

Resolve a currency from the beginning and/or the end of a string

Arguments

• list is any list in which currency names and symbols are expected

• options is a keyword list of options

Options

• :backend is any module() that includes use Cldr and therefore is a Cldr backend module(). The default is Cldr.default_backend!/0

• :locale is any valid locale returned by Cldr.known_locale_names/1 or a Cldr.LanguageTag struct returned by Cldr.Locale.new!/2 The default is options[:backend].get_locale()

• :only is an atom or list of atoms representing the currencies or currency types to be considered for a match. The equates to a list of acceptable currencies for parsing. See the notes below for currency types.

• :except is an atom or list of atoms representing the currencies or currency types to be not considered for a match. This equates to a list of unacceptable currencies for parsing. See the notes below for currency types.

• :fuzzy is a float greater than 0.0 and less than or equal to 1.0 which is used as input to String.jaro_distance/2 to determine is the provided currency string is close enough to a known currency string for it to identify definitively a currency code. It is recommended to use numbers greater than 0.8 in order to reduce false positives.

Returns

• An ISO417 currency code as an atom or

• {:error, {exception, message}}

Notes

The :only and :except options accept a list of currency codes and/or currency types. The following types are recognised.

If both :only and :except are specified, the :except entries take priority - that means any entries in :except are removed from the :only entries.

• :all, the default, considers all currencies

• :current considers those currencies that have a :to date of nil and which also is a known ISO4217 currency

• :historic is the opposite of :current

• :tender considers currencies that are legal tender

• :unannotated considers currencies that don't have "(some string)" in their names. These are usually financial instruments.

Examples

iex> Cldr.Number.Parser.resolve_currency("US dollars")
[:USD]

iex> Cldr.Number.Parser.resolve_currency("100 eurosports", fuzzy: 0.75)
[:EUR]

iex> Cldr.Number.Parser.resolve_currency("dollars des États-Unis", locale: "fr")
[:USD]

iex> Cldr.Number.Parser.resolve_currency("not a known currency", locale: "fr")
{:error,
 {Cldr.UnknownCurrencyError,
  "The currency \"not a known currency\" is unknown or not supported"}}