defmodule Cldr.Number.Format do
@moduledoc """
Functions to manage the collection of number patterns defined in Cldr.
Number patterns affect how numbers are interpreted in a localized context.
Here are some examples, based on the French locale. The "." shows where the
decimal point should go. The "," shows where the thousands separator should
go. A "0" indicates zero-padding: if the number is too short, a zero (in the
locale's numeric set) will go there. A "#" indicates no padding: if the
number is too short, nothing goes there. A "¤" shows where the currency sign
will go. The following illustrates the effects of different patterns for the
French locale, with the number "1234.567". Notice how the pattern characters
',' and '.' are replaced by the characters appropriate for the locale.
## Number Pattern Examples
| Pattern | Currency | Text |
| ------------- | :-------------: | ----------: |
| #,##0.## | n/a | 1 234,57 |
| #,##0.### | n/a | 1 234,567 |
| ###0.##### | n/a | 1234,567 |
| ###0.0000# | n/a | 1234,5670 |
| 00000.0000 | n/a | 01234,5670 |
| #,##0.00 ¤ | EUR | 1 234,57 € |
The number of # placeholder characters before the decimal do not matter,
since no limit is placed on the maximum number of digits. There should,
however, be at least one zero some place in the pattern. In currency formats,
the number of digits after the decimal also do not matter, since the
information in the supplemental data (see Supplemental Currency Data) is used
to override the number of decimal places — and the rounding — according to
the currency that is being formatted. That can be seen in the above chart,
with the difference between Yen and Euro formatting.
Details of the number formats are described in the
[Unicode documentation](http://unicode.org/reports/tr35/tr35-numbers.html#Number_Format_Patterns)
"""
@type format :: String.t()
@short_format_styles [:decimal_long, :decimal_short, :currency_short, :currency_long]
@format_styles [
:standard,
:currency,
:accounting,
:scientific,
:percent,
:accounting_alpha_next_to_number,
:accounting_no_symbol,
:currency_alpha_next_to_number,
:currency_no_symbol
] ++ @short_format_styles
defstruct @format_styles ++ [:currency_spacing, :other]
require Cldr
alias Cldr.Number.System
alias Cldr.Locale
alias Cldr.LanguageTag
def short_format_styles do
@short_format_styles
end
@doc """
Returns the list of decimal formats in the configured locales including
the list of locales configured for precompilation in `config.exs`.
This function exists to allow the decimal formatter
to precompile all the known formats at compile time.
## Arguments
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Example
=> Cldr.Number.Format.decimal_format_list(MyApp.Cldr)
["#", "#,##,##0%", "#,##,##0.###", "#,##,##0.00¤", "#,##,##0.00¤;(#,##,##0.00¤)",
"#,##,##0 %", "#,##0%", "#,##0.###", "#,##0.00 ¤",
"#,##0.00 ¤;(#,##0.00 ¤)", "#,##0.00¤", "#,##0.00¤;(#,##0.00¤)",
"#,##0 %", "#0%", "#0.######", "#0.00 ¤", "#E0", "%#,##0", "% #,##0",
"0", "0.000000E+000", "0000 M ¤", "0000¤", "000G ¤", "000K ¤", "000M ¤",
"000T ¤", "000mM ¤", "000m ¤", "000 Bio'.' ¤", "000 Bln ¤", "000 Bn ¤",
"000 B ¤", "000 E ¤", "000 K ¤", "000 MRD ¤", "000 Md ¤", "000 Mio'.' ¤",
"000 Mio ¤", "000 Mld ¤", "000 Mln ¤", "000 Mn ¤", "000 Mrd'.' ¤",
"000 Mrd ¤", "000 Mr ¤", "000 M ¤", "000 NT ¤", "000 N ¤", "000 Tn ¤",
"000 Tr ¤", ...]
"""
@spec decimal_format_list(Cldr.backend()) :: list(format())
def decimal_format_list(backend) do
Module.concat(backend, Number.Format).decimal_format_list
end
@doc """
Returns the list of decimal formats for a configured locale.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
This function exists to allow the decimal formatter to precompile all
the known formats at compile time. Its use is not otherwise recommended.
## Example
iex> Cldr.Number.Format.decimal_format_list_for("en", MyApp.Cldr)
{:ok, ["#,##0%", "#,##0.###", "#,##0.00", "#,##0.00;(#,##0.00)","#E0",
"0 billion", "0 million", "0 thousand",
"0 trillion", "00 billion", "00 million", "00 thousand", "00 trillion",
"000 billion", "000 million", "000 thousand", "000 trillion", "000B", "000K",
"000M", "000T", "00B", "00K", "00M", "00T", "0B", "0K", "0M", "0T",
"¤#,##0.00", "¤#,##0.00;(¤#,##0.00)", "¤000B", "¤000K", "¤000M",
"¤000T", "¤00B", "¤00K", "¤00M", "¤00T", "¤0B", "¤0K", "¤0M", "¤0T",
"¤ #,##0.00", "¤ #,##0.00;(¤ #,##0.00)", "¤ 000B", "¤ 000K", "¤ 000M",
"¤ 000T", "¤ 00B", "¤ 00K", "¤ 00M", "¤ 00T", "¤ 0B", "¤ 0K", "¤ 0M", "¤ 0T"]}
"""
@spec decimal_format_list_for(LanguageTag.t() | Locale.locale_name(), Cldr.backend()) ::
{:ok, list(String.t())} | {:error, {module(), String.t()}}
def decimal_format_list_for(locale, backend) do
Module.concat(backend, Number.Format).decimal_format_list_for(locale)
end
@doc """
Returns the decimal formats defined for a given locale.
## Options
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Examples
Cldr.Number.Format.all_formats_for("en", MyApp.Cldr)
#=> {:ok, %{latn: %Cldr.Number.Format{
accounting: "¤#,##0.00;(¤#,##0.00)",
currency: "¤#,##0.00",
percent: "#,##0%",
scientific: "#E0",
standard: "#,##0.###",
currency_short: [{"1000", [one: "¤0K", other: "¤0K"]},
{"10000", [one: "¤00K", other: "¤00K"]},
{"100000", [one: "¤000K", other: "¤000K"]},
{"1000000", [one: "¤0M", other: "¤0M"]},
{"10000000", [one: "¤00M", other: "¤00M"]},
{"100000000", [one: "¤000M", other: "¤000M"]},
{"1000000000", [one: "¤0B", other: "¤0B"]},
{"10000000000", [one: "¤00B", other: "¤00B"]},
{"100000000000", [one: "¤000B", other: "¤000B"]},
{"1000000000000", [one: "¤0T", other: "¤0T"]},
{"10000000000000", [one: "¤00T", other: "¤00T"]},
{"100000000000000", [one: "¤000T", other: "¤000T"]}],
....
}}
"""
@spec all_formats_for(LanguageTag.t() | Locale.locale_name(), Cldr.backend()) ::
{:ok, map()} | {:error, {module(), String.t()}}
def all_formats_for(locale, backend) do
Module.concat(backend, Number.Format).all_formats_for(locale)
end
@doc """
Returns the decimal formats defined for a given locale.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Returns
* a list of decimal formats or
* raises an exception
See `Cldr.Number.Format.all_formats_for/2` for further information.
"""
def all_formats_for!(locale, backend) do
Module.concat(backend, Number.Format).all_formats_for!(locale)
end
@doc """
Returns the minimum grouping digits for a locale.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/0`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Returns
* `{:ok, minumum_digits}` or
* `{:error, {exception, message}}`
## Examples
iex> Cldr.Number.Format.minimum_grouping_digits_for("en", MyApp.Cldr)
{:ok, 1}
"""
@spec minimum_grouping_digits_for(LanguageTag.t(), Cldr.backend()) ::
{:ok, non_neg_integer} | {:error, {module(), String.t()}}
def minimum_grouping_digits_for(locale, backend) do
Module.concat(backend, Number.Format).minimum_grouping_digits_for(locale)
end
@doc """
Returns the minimum grouping digits for a locale or raises if there is an error.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Examples
iex> Cldr.Number.Format.minimum_grouping_digits_for!("en", MyApp.Cldr)
1
Cldr.Number.Format.minimum_grouping_digits_for!(:invalid)
** (Cldr.UnknownLocaleError) The locale :invalid is invalid
"""
def minimum_grouping_digits_for!(locale, backend) do
Module.concat(backend, Number.Format).minimum_grouping_digits_for!(locale)
end
@doc """
Returns the default grouping for a locale.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/0`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Returns
* `{:ok, minumum_digits}` or
* `{:error, {exception, message}}`
## Examples
iex> Cldr.Number.Format.default_grouping_for("en", MyApp.Cldr)
{:ok, %{fraction: %{first: 0, rest: 0}, integer: %{first: 3, rest: 3}}}
"""
@spec default_grouping_for(LanguageTag.t() | Cldr.Locale.locale_name(), Cldr.backend()) ::
{:ok, non_neg_integer} | {:error, {module(), String.t()}}
def default_grouping_for(locale, backend) do
Module.concat(backend, Number.Format).default_grouping_for(locale)
end
@doc """
Returns the default grouping for a locale or raises if there is an error.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Examples
iex> Cldr.Number.Format.default_grouping_for!("en", MyApp.Cldr)
%{fraction: %{first: 0, rest: 0}, integer: %{first: 3, rest: 3}}
Cldr.Number.Format.default_grouping_for!(:invalid)
** (Cldr.UnknownLocaleError) The locale :invalid is invalid
"""
@spec default_grouping_for!(LanguageTag.t() | Cldr.Locale.locale_name(), Cldr.backend()) ::
map() | no_return
def default_grouping_for!(locale, backend) do
Module.concat(backend, Number.Format).default_grouping_for!(locale)
end
@doc """
Returns the currency space for a given locale and
number system.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `number_system` is any valid number system or number system type returned
by `Cldr.Number.System.number_systems_for/2`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
"""
@spec currency_spacing(
LanguageTag.t() | Cldr.Locale.locale_name(),
System.system_name(),
Cldr.backend()
) :: map() | {:error, {module(), String.t()}}
def currency_spacing(locale, number_system, backend) do
backend.currency_spacing(locale, number_system)
end
@doc """
Return the predfined formats for a given `locale` and `number_system`.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `number_system` is any valid number system or number system type returned
by `Cldr.Number.System.number_systems_for/2` or `Cldr.Number.System.number_system_names_for/2`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Example
Cldr.Number.Format.formats_for "fr", :native, MyApp.Cldr
#=> {:ok, %Cldr.Number.Format{
accounting: "#,##0.00 ¤;(#,##0.00 ¤)",
currency: "#,##0.00 ¤",
percent: "#,##0 %",
scientific: "#E0",
standard: "#,##0.###"
currency_short: [{"1000", [one: "0 k ¤", other: "0 k ¤"]},
{"10000", [one: "00 k ¤", other: "00 k ¤"]},
{"100000", [one: "000 k ¤", other: "000 k ¤"]},
{"1000000", [one: "0 M ¤", other: "0 M ¤"]},
{"10000000", [one: "00 M ¤", other: "00 M ¤"]},
{"100000000", [one: "000 M ¤", other: "000 M ¤"]},
{"1000000000", [one: "0 Md ¤", other: "0 Md ¤"]},
{"10000000000", [one: "00 Md ¤", other: "00 Md ¤"]},
{"100000000000", [one: "000 Md ¤", other: "000 Md ¤"]},
{"1000000000000", [one: "0 Bn ¤", other: "0 Bn ¤"]},
{"10000000000000", [one: "00 Bn ¤", other: "00 Bn ¤"]},
{"100000000000000", [one: "000 Bn ¤", other: "000 Bn ¤"]}],
...
}}
"""
@spec formats_for(LanguageTag.t() | Locale.locale_name(), atom | String.t(), Cldr.backend()) ::
{:ok, map()} | {:error, {module(), String.t()}}
def formats_for(locale, number_system, backend) do
Module.concat(backend, Number.Format).formats_for(locale, number_system)
end
@doc """
Return the predfined formats for a given `locale` and `number_system` or raises
if either the `locale` or `number_system` is invalid.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `number_system` is any valid number system or number system type returned
by `Cldr.Number.System.number_systems_for/2`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
"""
@spec formats_for!(LanguageTag.t(), Cldr.Number.System.system_name(), Cldr.backend()) ::
map() | no_return()
def formats_for!(locale, number_system, backend) do
case formats_for(locale, number_system, backend) do
{:ok, formats} -> formats
{:error, {exception, message}} -> raise exception, message
end
end
@doc """
Returns the format styles available for a `locale`.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `number_system` is any valid number system or number system type returned
by `Cldr.Number.System.number_systems_for/2`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
Format styles standardise the access to a format defined for a common
use. These types are `:standard`, `:currency`, `:accounting`, `:scientific`
and :percent, :currency_short, :decimal_short, :decimal_long.
These types can be used when formatting a number for output. For example
`Cldr.Number.to_string(123.456, format: :percent)`.
## Example
iex> {:ok, format_styles} = Cldr.Number.Format.format_styles_for("en", :latn, MyApp.Cldr)
iex> Enum.sort(format_styles)
[
:accounting,
:accounting_alpha_next_to_number,
:accounting_no_symbol,
:currency,
:currency_alpha_next_to_number,
:currency_long,
:currency_no_symbol,
:currency_short,
:decimal_long,
:decimal_short,
:percent,
:scientific,
:standard
]
"""
@reject_styles [:__struct__, :currency_spacing, :other]
@spec format_styles_for(
LanguageTag.t() | Locale.locale_name(),
System.system_name(),
Cldr.backend()
) :: {:ok, list(atom())} | {:error, {module(), String.t()}}
def format_styles_for(%LanguageTag{} = locale, number_system, backend) do
with {:ok, formats} <- formats_for(locale, number_system, backend) do
{
:ok,
formats
|> Map.to_list()
|> Enum.reject(fn {k, v} -> is_nil(v) || k in @reject_styles end)
|> Enum.into(%{})
|> Map.keys()
}
end
end
def format_styles_for(locale_name, number_system, backend) do
with {:ok, locale} <- Cldr.validate_locale(locale_name, backend) do
format_styles_for(locale, number_system, backend)
end
end
@doc """
Returns the short formats available for a locale.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `number_system` is any valid number system or number system type returned
by `Cldr.Number.System.number_systems_for/2`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Example
iex> {:ok, short_format_styles} = Cldr.Number.Format.short_format_styles_for("he", :latn, MyApp.Cldr)
iex> Enum.sort(short_format_styles)
[:currency_short, :decimal_long, :decimal_short]
"""
@isnt_really_a_short_format [:currency_long]
@short_formats MapSet.new(@short_format_styles -- @isnt_really_a_short_format)
@spec short_format_styles_for(
LanguageTag.t() | Cldr.Locale.locale_name(),
binary | atom,
Cldr.backend()
) ::
{:ok, list(atom())} | {:error, {module(), String.t()}}
@dialyzer {:nowarn_function, short_format_styles_for: 3}
def short_format_styles_for(%LanguageTag{} = locale, number_system, backend) do
with {:ok, formats} <- format_styles_for(locale, number_system, backend) do
{
:ok,
formats
|> MapSet.new()
|> MapSet.intersection(@short_formats)
|> MapSet.to_list()
}
end
end
def short_format_styles_for(locale_name, number_system, backend) do
with {:ok, locale} <- Cldr.validate_locale(locale_name, backend) do
short_format_styles_for(locale, number_system, backend)
end
end
@doc """
Returns the decimal format styles that are supported by
`Cldr.Number.Formatter.Decimal`.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `number_system` is any valid number system or number system type returned
by `Cldr.Number.System.number_systems_for/2`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Example
iex> {:ok, styles} = Cldr.Number.Format.decimal_format_styles_for("en", :latn, MyApp.Cldr)
iex> Enum.sort(styles)
[
:accounting,
:accounting_alpha_next_to_number,
:accounting_no_symbol,
:currency,
:currency_alpha_next_to_number,
:currency_long,
:currency_no_symbol,
:percent,
:scientific,
:standard
]
"""
@spec decimal_format_styles_for(
LanguageTag.t() | Locale.locale_name(),
System.system_name(),
Cldr.backend()
) :: {:ok, list(atom())} | {:error, {module(), String.t()}}
@dialyzer {:nowarn_function, decimal_format_styles_for: 3}
def decimal_format_styles_for(%LanguageTag{} = locale, number_system, backend) do
with {:ok, styles} <- format_styles_for(locale, number_system, backend),
{:ok, short_styles} <- short_format_styles_for(locale, number_system, backend) do
{:ok, styles -- short_styles -- [:currency_long, :currency_spacing, :other]}
end
end
def decimal_format_styles_for(locale_name, number_system, backend) do
with {:ok, locale} <- Cldr.validate_locale(locale_name, backend) do
decimal_format_styles_for(locale, number_system, backend)
end
end
@doc """
Returns the number system types available for a `locale`
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
A number system type is an identifier that categorises number systems
that comprise a site of digits or rules for transliterating or translating
digits and a number system name for determining plural rules and format
masks.
If that all sounds a bit complicated then the default `number system type`
called `:default` is probably what you want nearly all the time.
## Examples
iex> Cldr.Number.Format.format_system_types_for("pl", MyApp.Cldr)
{:ok, [:default, :native]}
iex> Cldr.Number.Format.format_system_types_for("ru", MyApp.Cldr)
{:ok, [:default, :native]}
iex> Cldr.Number.Format.format_system_types_for("th", MyApp.Cldr)
{:ok, [:default, :native]}
"""
@spec format_system_types_for(Cldr.Locale.locale_name() | LanguageTag.t(), Cldr.backend()) ::
{:ok, Keyword.t()} | {:error, {module(), String.t()}}
def format_system_types_for(%LanguageTag{} = locale, backend) do
with {:ok, _} <- Cldr.validate_locale(locale, backend) do
{:ok, systems} = System.number_systems_for(locale, backend)
{:ok, Map.keys(systems)}
end
end
def format_system_types_for(locale_name, backend) do
with {:ok, locale} <- Cldr.validate_locale(locale_name, backend) do
format_system_types_for(locale, backend)
end
end
@doc """
Returns the names of the number systems for the `locale`.
## Arguments
* `locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct returned by `Cldr.Locale.new!/2`. The default
is `Cldr.get_locale/1`
* `backend` is any `Cldr` backend. That is, any module that
contains `use Cldr`
## Examples
iex> Cldr.Number.Format.format_system_names_for("th", MyApp.Cldr)
{:ok, [:latn, :thai]}
iex> Cldr.Number.Format.format_system_names_for("pl", MyApp.Cldr)
{:ok, [:latn]}
"""
@spec format_system_names_for(LanguageTag.t() | Cldr.Locale.locale_name(), Cldr.backend()) ::
{:ok, list(atom)} | {:error, {module(), String.t()}}
def format_system_names_for(%LanguageTag{} = locale, backend) do
Cldr.Number.System.number_system_names_for(locale, backend)
end
def format_system_names_for(locale_name, backend) do
with {:ok, locale} <- Cldr.validate_locale(locale_name, backend) do
format_system_names_for(locale, backend)
end
end
end
