defmodule Cldr.Unit do
@moduledoc """
Supports the CLDR Units definitions which provide for the localization of many
unit types.
The primary public API defines:
* `Cldr.Unit.to_string/3` which, given a unit or unit list will
output a localized string
* `Cldr.Unit.known_units/0` identifies the available units for localization
* `Cldr.Unit.{add, sub, mult, div}/2` to support basic unit mathematics between
units of compatible type (like length or volume)
* `Cldr.Unit.compare/2` to compare one unit to another unit as long as they
are convertible.
* `Cldr.Unit.convert/2` to convert one unit to another unit as long as they
are convertible.
* `Cldr.Unit.localize/3` will convert a unit into the units preferred for a
given locale and usage
* `Cldr.Unit.preferred_units/3` which, for a given unit and locale,
will return a list of preferred units that can be applied to
`Cldr.Unit.decompose/2`
* `Cldr.Unit.decompose/2` to take a unit and return a list of units decomposed
by a list of smaller units.
"""
import Kernel, except: [to_string: 1]
alias Cldr.Unit
alias Cldr.{Locale, LanguageTag}
alias Cldr.Unit.{Math, Alias, Parser, Conversion, Conversions, Preference, BaseUnit, Format}
@enforce_keys [:unit, :value, :base_conversion, :usage, :format_options]
defstruct unit: nil,
value: 0,
base_conversion: [],
usage: :default,
format_options: [],
backend: nil
@root_locale_name Cldr.Config.root_locale_name()
# See https://unicode.org/reports/tr35/tr35-general.html#Case
@grammatical_case [
:abessive,
:ablative,
:accusative,
:adessive,
:allative,
:causal,
:comitative,
:dative,
:delative,
:elative,
:ergative,
:genitive,
:illative,
:inessive,
:instrumental,
:locative,
:localtivecopulative,
:nominative,
:oblique,
:partitive,
:prepositional,
:sociative,
:sublative,
:superessive,
:terminative,
:translative,
:vocative
]
@grammatical_gender [
:animate,
:inanimate,
:personal,
:common,
:feminine,
:masculine,
:neuter
]
@styles [
:long,
:short,
:narrow
]
@measurement_systems Cldr.Config.measurement_systems()
@system_names Map.keys(@measurement_systems) |> Enum.sort()
@measurement_system_keys [
:default,
:paper_size,
:temperature
]
# Converts a list of atoms into a typespec
type = &Enum.reduce(&1, fn x, acc -> {:|, [], [x, acc]} end)
@type translatable_unit :: atom() | list(atom())
@type unit :: translatable_unit | String.t()
@type category :: atom()
@type usage :: atom()
@type grammatical_gender :: unquote(type.(@grammatical_gender))
@type grammatical_case :: unquote(type.(@grammatical_case))
@type measurement_system :: unquote(type.(@system_names))
@type measurement_system_key :: unquote(type.(@measurement_system_keys))
@type style :: unquote(type.(@styles))
@type value :: Cldr.Math.number_or_decimal()
@type locale :: Locale.locale_name() | LanguageTag.t()
@type base_conversion :: {translatable_unit, Conversion.t()}
@type conversion :: [base_conversion()] | {[base_conversion()], [base_conversion()]}
@type t :: %__MODULE__{
unit: unit(),
value: value(),
base_conversion: conversion(),
usage: usage(),
format_options: Keyword.t()
}
@default_style :long
@app_name Cldr.Config.app_name()
@data_dir [:code.priv_dir(@app_name), "/cldr/locales"] |> :erlang.iolist_to_binary()
@config %{data_dir: @data_dir, locales: ["en"], default_locale: "en"}
@unit_tree :en
|> Cldr.Locale.Loader.get_locale(@config)
|> Map.fetch!(:units)
|> Map.fetch!(:long)
|> Enum.map(fn {k, v} -> {k, Map.keys(v) |> Enum.sort()} end)
|> Map.new()
@units Cldr.Config.units()
defdelegate convert(unit_1, to_unit), to: Conversion
defdelegate convert!(unit_1, to_unit), to: Conversion
defdelegate preferred_units(unit, backend, options), to: Preference
defdelegate preferred_units!(unit, backend, options), to: Preference
defdelegate add(unit_1, unit_2), to: Math
defdelegate sub(unit_1, unit_2), to: Math
defdelegate mult(unit_1, unit_2), to: Math
defdelegate div(unit_1, unit_2), to: Math
defdelegate add!(unit_1, unit_2), to: Math
defdelegate sub!(unit_1, unit_2), to: Math
defdelegate mult!(unit_1, unit_2), to: Math
defdelegate div!(unit_1, unit_2), to: Math
defdelegate round(unit, places, mode), to: Math
defdelegate round(unit, places), to: Math
defdelegate round(unit), to: Math
defdelegate compare(unit_1, unit_2), to: Math
@doc """
Returns the units that are defined for
a given category (such as :volume, :length)
See also `Cldr.Unit.known_unit_categories/0`.
## Example
=> Cldr.Unit.known_units_by_category
%{
acceleration: [:g_force, :meter_per_square_second],
angle: [:arc_minute, :arc_second, :degree, :radian, :revolution],
area: [:acre, :dunam, :hectare, :square_centimeter, :square_foot,
:square_inch, :square_kilometer, :square_meter, :square_mile, :square_yard],
concentr: [:karat, :milligram_per_deciliter, :millimole_per_liter, :mole,
:percent, :permille, :permillion, :permyriad], ...
}
"""
@units_by_category @unit_tree
|> Map.delete(:compound)
|> Map.delete(:coordinate)
@doc since: "3.4.0"
@spec known_units_by_category :: %{category() => [translatable_unit(), ...]}
def known_units_by_category do
@units_by_category
end
@doc """
Returns the known units that are directly
translatable.
These units have localised content in CLDR
and are used as a key to retrieving that
content.
## Example
=> Cldr.Unit.known_units
[:acre, :acre_foot, :ampere, :arc_minute, :arc_second, :astronomical_unit, :bit,
:bushel, :byte, :calorie, :carat, :celsius, :centiliter, :centimeter, :century,
:cubic_centimeter, :cubic_foot, :cubic_inch, :cubic_kilometer, :cubic_meter,
:cubic_mile, :cubic_yard, :cup, :cup_metric, :day, :deciliter, :decimeter,
:degree, :fahrenheit, :fathom, :fluid_ounce, :foodcalorie, :foot, :furlong,
:g_force, :gallon, :gallon_imperial, :generic, :gigabit, :gigabyte, :gigahertz,
:gigawatt, :gram, :hectare, :hectoliter, :hectopascal, :hertz, :horsepower,
:hour, :inch, ...]
"""
# Beaufort not fully supported yet
@translatable_units @units_by_category
|> Map.values()
|> List.flatten()
|> List.delete(:generic)
|> List.delete(:beaufort)
|> Kernel.++(Cldr.Unit.Additional.additional_units())
@spec known_units :: [translatable_unit(), ...]
def known_units do
@translatable_units
end
@deprecated "Use Cldr.Unit.known_units/0"
defdelegate unit(), to: __MODULE__, as: :known_units
@doc """
Returns a list of the known unit categories.
## Example
iex> Cldr.Unit.known_unit_categories()
[:acceleration, :angle, :area, :concentr, :consumption, :digital,
:duration, :electric, :energy, :force, :frequency, :graphics, :length, :light, :mass,
:power, :pressure, :speed, :temperature, :torque, :volume]
"""
@unit_categories Map.keys(@units_by_category) |> Enum.sort()
@spec known_unit_categories :: list(category())
def known_unit_categories do
@unit_categories
end
@doc """
Returns the list of units defined for a given
category.
## Arguments
* `category` is any unit category returned by
`Cldr.Unit.known_unit_categories/0`.
See also `Cldr.Unit.known_units_by_category/0`.
## Example
=> Cldr.Unit.known_units_for_category :volume
{
:ok,
[
:cubic_centimeter,
:centiliter,
:hectoliter,
:cubic_kilometer,
:acre_foot,
...
]
}
"""
@doc since: "3.4.0"
@spec known_units_for_category(category()) ::
{:ok, [translatable_unit(), ...]} | {:error, {module(), String.t()}}
def known_units_for_category(category) when category in @unit_categories do
units = Map.fetch!(known_units_by_category(), category)
{:ok, units}
end
def known_units_for_category(category) do
{:error, unit_category_error(category)}
end
@doc """
Returns a list of the known grammatical
cases.
A grammatical case can be provided as an option to
`Cldr.Unit.to_string/2` in order to localise a unit
appropriate to the context in which it is used.
## Example
iex> Cldr.Unit.known_grammatical_cases()
[
:abessive,
:ablative,
:accusative,
:adessive,
:allative,
:causal,
:comitative,
:dative,
:delative,
:elative,
:ergative,
:genitive,
:illative,
:inessive,
:instrumental,
:locative,
:localtivecopulative,
:nominative,
:oblique,
:partitive,
:prepositional,
:sociative,
:sublative,
:superessive,
:terminative,
:translative,
:vocative
]
"""
@doc since: "3.5.0"
def known_grammatical_cases do
@grammatical_case
end
@doc """
Returns a list of the known grammatical genders.
A gender can be provided as an option to
`Cldr.Unit.to_string/2` in order to localise a unit
appropriate to the context in which it is used.
## Example
iex> Cldr.Unit.known_grammatical_genders()
[
:animate,
:inanimate,
:personal,
:common,
:feminine,
:masculine,
:neuter
]
"""
@doc since: "3.5.0"
def known_grammatical_genders do
@grammatical_gender
end
@doc """
Returns a new `Unit.t` struct.
## Arguments
* `value` is any float, integer or `Decimal`
* `unit` is any unit name returned by `Cldr.Unit.known_units/0`
* `options` is Keyword list of options. The default
is `[]`
## Options
* `:usage` is the intended use of the unit. This
is used during localization to convert the unit
to that appropriate for the unit category,
usage, target territory and unit value. The usage
must be defined for the unit's category. See
`Cldr.Unit.unit_category_usage/0` for the known
usage types for each category.
## Returns
* `unit` or
* `{:error, {exception, message}}`
## Examples
iex> Cldr.Unit.new(23, :gallon)
{:ok, Cldr.Unit.new!(:gallon, 23)}
iex> Cldr.Unit.new(:gallon, 23)
{:ok, Cldr.Unit.new!(:gallon, 23)}
iex> Cldr.Unit.new(14, :gadzoots)
{:error, {Cldr.UnknownUnitError,
"Unknown unit was detected at \\"gadzoots\\""}}
Cldr.Unit.new(:gallon, 23, usage: :fluid)
#=> {:ok, #Cldr.Unit<:gallon, 23, usage: :fluid, format_options: []>}
"""
@spec new(unit() | value(), value() | unit(), Keyword.t()) ::
{:ok, t()} | {:error, {module(), String.t()}}
def new(value, unit, options \\ [])
def new(value, unit, options) when is_integer(value) do
create_unit(value, unit, options)
end
def new(unit, value, options) when is_integer(value) do
new(value, unit, options)
end
def new(value, unit, options) when is_float(value) do
create_unit(Decimal.from_float(value), unit, options)
end
def new(unit, value, options) when is_float(value) do
new(Decimal.from_float(value), unit, options)
end
def new(%Decimal{} = value, unit, options) do
create_unit(value, unit, options)
end
def new(unit, %Decimal{} = value, options) do
new(value, unit, options)
end
def new(a, b, options) do
with {:error, _} <- maybe_new(a, b, options) do
maybe_new(b, a, options)
end
end
def maybe_new(a, b, options) do
new(a, Decimal.new(b), options)
rescue
Decimal.Error ->
{:error,
{Cldr.InvalidUnit,
"Could not resolve a new unit from Cldr.Unit.new(#{inspect(b)}, #{inspect(a)})"}}
end
@doc """
Returns a new `Unit.t` struct or raises on error.
## Arguments
* `value` is any float, integer or `Decimal`
* `unit` is any unit returned by `Cldr.Unit.known_units/0`
## Returns
* `unit` or
* raises an exception
## Examples
iex> Cldr.Unit.new! 23, :gallon
Cldr.Unit.new!(:gallon, 23)
Cldr.Unit.new! 14, :gadzoots
** (Cldr.UnknownUnitError) The unit :gadzoots is not known.
(ex_cldr_units) lib/cldr/unit.ex:57: Cldr.Unit.new!/2
"""
@spec new!(unit() | value(), value() | unit()) :: t() | no_return()
def new!(unit, value, options \\ []) do
case new(unit, value, options) do
{:ok, unit} -> unit
{:error, {exception, message}} -> raise exception, message
end
end
@doc """
Returns a new `Unit.t` struct from a map.
A map representation of a unit may be generated
from json or other external format data.
The map provided must have the keys `unit` and
`value` in either `String.t` or `atom` (both keys
must be of the same type).
`value` must be either an integer, a float or a map
representation of a rational number. A rational number
map has the keys `numerator` and `denominator` in either
`String.t` or `atom` format (both keys must be of
the same type).
## Arguments
* `map` is a map with the keys `unit` and `value`
## Returns
* `{:ok, unit}` or
* `{:error, {exception, reason}}`
## Examples
Cldr.Unit.from_map %{value: 1, unit: "kilogram"}
=> {:ok, #Cldr.Unit<:kilogram, 1>}
Cldr.Unit.from_map %{value: %{numerator: 3, denominator: 4}, unit: "kilogram"}
=> {:ok, #Cldr.Unit<:kilogram, 3 <|> 4>}
Cldr.Unit.from_map %{"value" => 1, "unit" => "kilogram"}
=> {:ok, #Cldr.Unit<:kilogram, 1>}
"""
def from_map(%{"unit" => unit, "value" => value}) when is_number(value) do
new(unit, value)
end
def from_map(%{"unit" => unit, "value" => value}) when is_binary(value) do
new(unit, value)
end
def from_map(%{
"unit" => unit,
"value" => %{"numerator" => numerator, "denominator" => denominator}
}) do
new(unit, Decimal.div(numerator, denominator))
end
def from_map(%{unit: unit, value: value}) when is_number(value) do
new(unit, value)
end
def from_map(%{unit: unit, value: %{numerator: numerator, denominator: denominator}}) do
new(unit, Decimal.div(numerator, denominator))
end
def from_map(other) do
{:error, unit_error(other)}
end
@doc """
Parse a string to create a new unit.
This function attempts to parse a string
into a `number` and `unit type`. If successful
it attempts to create a new unit using
`Cldr.Unit.new/3`.
The parsed `unit type` is aliased against all the
known unit names for a give locale (or the current
locale if no locale is specified). The known
aliases for unit types can be returned with
`MyApp.Cldr.Unit.unit_strings_for/1` where `MyApp.Cldr`
is the name of a backend module.
## Arguments
* `unit string` is any string to be parsed and if
possible used to create a new `t:Cldr.Unit`
* `options` is a keyword list of options
## Options
* `:locale` is any valid locale name returned by `Cldr.known_locale_names/0`
or a `t:Cldr.LanguageTag` struct. The default is `Cldr.get_locale/0`
* `:backend` is any module that includes `use Cldr` and therefore
is a `Cldr` backend module. The default is `Cldr.default_backend!/0`.
* `:only` is a unit category or unit, or a list of unit categories and units.
The parsed unit must match one of the categories or units in order to
be valid. This is helpful when disambiguating parsed units. For example,
parsing "2w" could be either "2 watts" or "2 weeks". Specifying `only: :duration`
would return "2 weeks". Specifying `only: :power` would return
"2 watts"
* `:except` is the oppostte of `:only`. The parsed unit must *not*
match the specified unit or category, or unit categories and units.
## Returns
* `{:ok, unit}` or
* `{:error, {exception, reason}}`
## Notes
* When both `:only` and `:except` options are passed, both
conditions must be true in order to return a parsed result.
* Only units returned by `Cldr.Unit.known_units/0` can be
used in the `:only` and `:except` filters.
## Examples
iex> Cldr.Unit.parse "1kg"
Cldr.Unit.new(1, :kilogram)
iex> Cldr.Unit.parse "1w"
Cldr.Unit.new(1, :watt)
iex> Cldr.Unit.parse "1w", only: :duration
Cldr.Unit.new(1, :week)
iex> Cldr.Unit.parse "1m", only: [:year, :month, :day]
Cldr.Unit.new(1, :month)
iex> Cldr.Unit.parse "1 tages", locale: "de"
Cldr.Unit.new(1, :day)
iex> Cldr.Unit.parse "1 tag", locale: "de"
Cldr.Unit.new(1, :day)
iex> Cldr.Unit.parse("42 millispangels")
{:error, {Cldr.UnknownUnitError, "Unknown unit was detected at \\"spangels\\""}}
"""
@spec parse(binary) :: {:ok, t()} | {:error, {module(), binary()}}
@doc since: "3.6.0"
def parse(unit_string, options \\ []) do
{locale, backend} = Cldr.locale_and_backend_from(options)
with {:ok, locale} <- Cldr.validate_locale(locale, backend),
{:ok, strings} <- Module.concat([backend, :Unit]).unit_strings_for(locale) do
case Cldr.Number.Parser.scan(unit_string, options) do
[number, unit] when is_number(number) and is_binary(unit) ->
units = resolve_unit_alias(unit, strings)
new_unit(number, unit, units, options)
[unit, number] when is_number(number) and is_binary(unit) ->
units = resolve_unit_alias(unit, strings)
new_unit(number, unit, units, options)
_other ->
{:error, not_parseable_error(unit_string)}
end
end
end
@doc """
Parse a string to find a matching unit-atom.
This function attempts to parse a string and
extract the `unit type`.
The parsed `unit type` is aliased against all the
known unit names for a give locale (or the current
locale if no locale is specified). The known
aliases for unit types can be returned with
`MyApp.Cldr.Unit.unit_strings_for/1` where `MyApp.Cldr`
is the name of a backend module.
## Arguments
* `unit_name_string` is any string to be parsed and converted into a `unit type`
* `options` is a keyword list of options
## Options
* `:locale` is any valid locale name returned by `Cldr.known_locale_names/0`
or a `t:Cldr.LanguageTag` struct. The default is `Cldr.get_locale/0`
* `:backend` is any module that includes `use Cldr` and therefore
is a `Cldr` backend module. The default is `Cldr.default_backend!/0`.
* `:only` is a unit category or unit, or a list of unit categories and units.
The parsed unit must match one of the categories or units in order to
be valid. This is helpful when disambiguating parsed units. For example,
parsing "w" could be either `:watt` or `:weeks`. Specifying `only: :duration`
would return `:weeks`. Specifying `only: :power` would return `:watt`
* `:except` is the oppostte of `:only`. The parsed unit must *not*
match the specified unit or category, or unit categories and units.
## Returns
* `{:ok, unit_name}` or
* `{:error, {exception, reason}}`
## Notes
* When both `:only` and `:except` options are passed, both
conditions must be true in order to return a parsed result.
* Only units returned by `Cldr.Unit.known_units/0` can be
used in the `:only` and `:except` filters.
## Examples
iex> Cldr.Unit.parse_unit_name "kg"
{:ok, :kilogram}
iex> Cldr.Unit.parse_unit_name "w"
{:ok, :watt}
iex> Cldr.Unit.parse_unit_name "w", only: :duration
{:ok, :week}
iex> Cldr.Unit.parse_unit_name "m", only: [:year, :month, :day]
{:ok, :month}
iex> Cldr.Unit.parse_unit_name "tages", locale: "de"
{:ok, :day}
iex> Cldr.Unit.parse_unit_name "tag", locale: "de"
{:ok, :day}
iex> Cldr.Unit.parse_unit_name("millispangels")
{:error, {Cldr.UnknownUnitError, "Unknown unit was detected at \\"spangels\\""}}
"""
@doc since: "3.14.0"
@spec parse_unit_name(binary, Keyword.t()) :: {:ok, atom} | {:error, {module(), binary()}}
def parse_unit_name(unit_name_string, options \\ []) do
{locale, backend} = Cldr.locale_and_backend_from(options)
with {:ok, locale} <- Cldr.validate_locale(locale, backend),
{:ok, strings} <- Module.concat([backend, :Unit]).unit_strings_for(locale),
units = resolve_unit_alias(unit_name_string, strings),
{:ok, {only, except, _}} <- get_filter_options(options),
{:ok, unit} = unit_matching_filter(unit_name_string, units, only, except),
{:ok, unit, _base_conversion} <- validate_unit(unit) do
{:ok, unit}
end
end
defp new_unit(number, unit, units, options) do
with {:ok, {only, except, options}} <- get_filter_options(options),
{:ok, unit} <- unit_matching_filter(unit, units, only, except) do
new(number, unit, options)
end
end
defp get_filter_options(options) do
{only, options} = Keyword.pop(options, :only, []) |> maybe_list_wrap()
{except, options} = Keyword.pop(options, :except, []) |> maybe_list_wrap()
with {:ok, only} <- validate_categories_or_units(only),
{:ok, except} <- validate_categories_or_units(except) do
{:ok, {only, except, options}}
end
end
# If there are no options to filter then
# use the original implementation which is to pick
# the shortest match (lexically shortest)
defp unit_matching_filter(_unit, unit, {[], []} = _only, {[], []} = _except)
when is_binary(unit) do
{:ok, unit}
end
defp unit_matching_filter(_unit, units, {[], []} = _only, {[], []} = _except) do
units
|> Enum.map(&Kernel.to_string/1)
|> Enum.sort(&(String.length(&1) <= String.length(&2) && &1 < &2))
|> hd
|> wrap(:ok)
end
# If there is an :only and/or :except option then
# filter for a match. If there is no match its an
# error. And error could be because the result is
# ambiguous (multiple results) or because no category
# could be derived for a unit
defp unit_matching_filter(unit, units, only, except) do
case filter_units(units, only, except) do
[unit] -> {:ok, unit}
[] -> {:error, category_unit_match_error(units, only, except)}
units -> {:error, ambiguous_unit_error(unit, units)}
end
end
defp filter_units(units, only, except) do
Enum.filter(units, fn unit ->
case unit_category(unit) do
{:ok, category} ->
category_match?(category, only, except) && unit_match?(unit, only, except)
_other ->
false
end
end)
end
defp category_match?(_category, {[], _}, {[], _}), do: true
defp category_match?(category, {only, _}, {[], _}), do: category in only
defp category_match?(category, {[], _}, {except, _}), do: category not in except
defp category_match?(category, {only, _}, {except, _}),
do: category in only and category not in except
defp unit_match?(_unit, {_, []}, {_, []}), do: true
defp unit_match?(unit, {_, only}, {_, []}), do: unit in only
defp unit_match?(unit, {_, []}, {_, except}), do: unit not in except
defp unit_match?(unit, {_, only}, {_, except}), do: unit in only and unit not in except
defp wrap(term, atom), do: {atom, term}
defp maybe_list_wrap({list, options}) when is_list(list), do: {list, options}
defp maybe_list_wrap({other, options}), do: {[other], options}
@doc """
Parse a string to create a new unit or
raises an exception.
This function attempts to parse a string
into a `number` and `unit type`. If successful
it attempts to create a new unit using
`Cldr.Unit.new/3`.
The parsed `unit type` is un-aliased against all the
known unit names for a give locale (or the current
locale if no locale is specified). The known
aliases for unit types can be returned with
`MyApp.Cldr.Unit.unit_strings_for/1` where `MyApp.Cldr`
is the name of a backend module.
## Arguments
* `unit string` is any string to be parsed and if
possible used to create a new `t:Cldr.Unit`
* `options` is a keyword list of options
## Options
* `:locale` is any valid locale name returned by `Cldr.known_locale_names/0`
or a `t:Cldr.LanguageTag` struct. The default is `Cldr.get_locale/0`
* `:backend` is any module that includes `use Cldr` and therefore
is a `Cldr` backend module. The default is `Cldr.default_backend!/0`.
* `:only` is a unit category or unit, or a list of unit categories and units.
The parsed unit must match one of the categories or units in order to
be valid. This is helpful when disambiguating parsed units. For example,
parsing "2w" could be either "2 watts" or "2 weeks". Specifying `only: :duration`
would return "2 weeks". Specifying `only: :power` would return
"2 watts"
* `:except` is the oppostte of `:only`. The parsed unit must *not*
match the specified unit or category, or unit categories and units.
## Notes
* When both `:only` and `:except` options are passed, both
conditions must be true in order to return a parsed result.
* Only units returned by `Cldr.Unit.known_units/0` can be
used in the `:only` and `:except` filters.
## Returns
* `unit` or
* raises an exception
## Examples
iex> Cldr.Unit.parse! "1kg"
Cldr.Unit.new!(1, :kilogram)
iex> Cldr.Unit.parse! "1 tages", locale: "de"
Cldr.Unit.new!(1, :day)
iex> Cldr.Unit.parse!("42 candela per lux")
Cldr.Unit.new!(42, "candela per lux")
iex> Cldr.Unit.parse!("42 millispangels")
** (Cldr.UnknownUnitError) Unknown unit was detected at "spangels"
"""
@spec parse!(binary) :: t() | no_return()
@doc since: "3.6.0"
def parse!(unit_string, options \\ []) do
case parse(unit_string, options) do
{:ok, unit} -> unit
{:error, {exception, message}} -> raise exception, message
end
end
@doc """
Parse a string to find a matching unit-atom.
This function attempts to parse a string and
extract the `unit type`.
The parsed `unit type` is aliased against all the
known unit names for a give locale (or the current
locale if no locale is specified). The known
aliases for unit types can be returned with
`MyApp.Cldr.Unit.unit_strings_for/1` where `MyApp.Cldr`
is the name of a backend module.
## Arguments
* `unit_name_string` is any string to be parsed and converted into a `unit type`
* `options` is a keyword list of options
## Options
* `:locale` is any valid locale name returned by `Cldr.known_locale_names/0`
or a `t:Cldr.LanguageTag` struct. The default is `Cldr.get_locale/0`
* `:backend` is any module that includes `use Cldr` and therefore
is a `Cldr` backend module. The default is `Cldr.default_backend!/0`.
* `:only` is a unit category or unit, or a list of unit categories and units.
The parsed unit must match one of the categories or units in order to
be valid. This is helpful when disambiguating parsed units. For example,
parsing "w" could be either `watts` or `:week`. Specifying `only: :duration`
would return `:week`. Specifying `only: :power` would return `:watts`
* `:except` is the oppostte of `:only`. The parsed unit must *not*
match the specified unit or category, or unit categories and units.
## Returns
* `unit_name` or
* raises an exception
## Notes
* When both `:only` and `:except` options are passed, both
conditions must be true in order to return a parsed result.
* Only units returned by `Cldr.Unit.known_units/0` can be
used in the `:only` and `:except` filters.
## Examples
iex> Cldr.Unit.parse_unit_name! "kg"
:kilogram
iex> Cldr.Unit.parse_unit_name! "w"
:watt
iex> Cldr.Unit.parse_unit_name! "w", only: :duration
:week
iex> Cldr.Unit.parse_unit_name! "m", only: [:year, :month, :day]
:month
iex> Cldr.Unit.parse_unit_name! "tages", locale: "de"
:day
iex> Cldr.Unit.parse_unit_name! "tag", locale: "de"
:day
iex> Cldr.Unit.parse_unit_name!("millispangels")
** (Cldr.UnknownUnitError) Unknown unit was detected at "spangels"
"""
@doc since: "3.14.0"
@spec parse_unit_name!(binary) :: atom() | no_return()
def parse_unit_name!(unit_name_string, options \\ []) do
case parse_unit_name(unit_name_string, options) do
{:ok, unit} -> unit
{:error, {exception, message}} -> raise exception, message
end
end
defp resolve_unit_alias(unit, strings) do
unit = String.trim(unit)
Map.get(strings, unit, unit)
end
@default_use :default
@default_format_options []
defp create_unit(value, unit, options) do
usage = Keyword.get(options, :usage, @default_use)
format_options = Keyword.get(options, :format_options, @default_format_options)
with {:ok, unit, base_conversion} <- validate_unit(unit),
{:ok, usage} <- validate_usage(unit, usage, base_conversion) do
unit = %Unit{
unit: unit,
value: value,
base_conversion: base_conversion,
usage: usage,
format_options: format_options
}
{:ok, unit}
end
end
@doc false
def validate_usage(_unit, @default_use = usage, _base_conversion) do
{:ok, usage}
end
def validate_usage(unit, usage, base_conversion) do
with {:ok, category} <- unit_category(unit, base_conversion) do
validate_category_usage(category, usage)
end
end
@default_category_usage [@default_use]
defp validate_category_usage(category, usage) when is_atom(usage) do
usage_list = Map.get(unit_category_usage(), category, @default_category_usage)
if usage in usage_list do
{:ok, usage}
else
{:error, unknown_usage_error(category, usage)}
end
end
defp validate_category_usage(category, "") do
validate_category_usage(category, @default_use)
end
defp validate_category_usage(category, usage) when is_binary(usage) do
atom_usage = String.to_existing_atom(usage)
validate_category_usage(category, atom_usage)
rescue
ArgumentError ->
{:error, unknown_usage_error(category, usage)}
end
defp validate_categories_or_units(units_or_categories) do
{categories, units} = Enum.split_with(units_or_categories, &(&1 in known_unit_categories()))
invalid_units = Enum.filter(units, &(&1 not in known_units()))
if invalid_units == [] do
{:ok, {categories, units}}
else
{:error, unit_error(invalid_units)}
end
end
@doc """
Formats a number into a string according to a unit definition
for the current process's locale and backend.
The current process's locale is set with
`Cldr.put_locale/1`.
See `Cldr.Unit.to_string/3` for full details.
"""
@spec to_string(list_or_number :: Unit.value() | Unit.t() | [Unit.t()]) ::
{:ok, String.t()} | {:error, {atom, binary}}
def to_string(unit) do
Format.to_string(unit)
end
@doc """
Formats a number into a string according to a unit definition for a locale.
During processing any `:format_options` of a `Unit.t()` are merged with
`options` with `options` taking precedence.
## Arguments
* `list_or_number` is any number (integer, float or Decimal) or a
`t:Cldr.Unit` struct or a list of `t:Cldr.Unit` structs
* `backend` is any module that includes `use Cldr` and therefore
is a `Cldr` backend module. The default is `Cldr.default_backend!/0`.
* `options` is a keyword list of options.
## Options
* `:unit` is any unit returned by `Cldr.Unit.known_units/0`. Ignored if
the number to be formatted is a `t:Cldr.Unit` struct
* `:locale` is any valid locale name returned by `Cldr.known_locale_names/1`
or a `Cldr.LanguageTag` struct. The default is `Cldr.get_locale/0`
* `style` is one of those returned by `Cldr.Unit.styles`.
The current styles are `:long`, `:short` and `:narrow`.
The default is `style: :long`
* `:grammatical_case` indicates that a localisation for the given
locale and given grammatical case should be used. See `Cldr.Unit.known_grammatical_cases/0`
for the list of known grammatical cases. Note that not all locales
define all cases. However all locales do define the `:nominative`
case, which is also the default.
* `:gender` indicates that a localisation for the given
locale and given grammatical gender should be used.
See `Cldr.Unit.known_grammatical_genders/0`
for the list of known grammatical genders. Note that not all locales
define all genders.
* `:list_options` is a keyword list of options for formatting a list
which is passed through to `Cldr.List.to_string/3`. This is only
applicable when formatting a list of units.
* Any other options are passed to `Cldr.Number.to_string/2`
which is used to format the `number`
## Returns
* `{:ok, formatted_string}` or
* `{:error, {exception, message}}`
## Examples
iex> Cldr.Unit.to_string Cldr.Unit.new!(:gallon, 123), MyApp.Cldr
{:ok, "123 gallons"}
iex> Cldr.Unit.to_string Cldr.Unit.new!(:gallon, 1), MyApp.Cldr
{:ok, "1 gallon"}
iex> Cldr.Unit.to_string Cldr.Unit.new!(:gallon, 1), MyApp.Cldr, locale: "af"
{:ok, "1 gelling"}
iex> Cldr.Unit.to_string Cldr.Unit.new!(:gallon, 1), MyApp.Cldr, locale: "bs"
{:ok, "1 galon"}
iex> Cldr.Unit.to_string Cldr.Unit.new!(:gallon, 1234), MyApp.Cldr, format: :long
{:ok, "1 thousand gallons"}
iex> Cldr.Unit.to_string Cldr.Unit.new!(:gallon, 1234), MyApp.Cldr, format: :short
{:ok, "1K gallons"}
iex> Cldr.Unit.to_string Cldr.Unit.new!(:megahertz, 1234), MyApp.Cldr
{:ok, "1,234 megahertz"}
iex> Cldr.Unit.to_string Cldr.Unit.new!(:megahertz, 1234), MyApp.Cldr, style: :narrow
{:ok, "1,234MHz"}
iex> unit = Cldr.Unit.new!(123, :foot)
iex> Cldr.Unit.to_string unit, MyApp.Cldr
{:ok, "123 feet"}
iex> Cldr.Unit.to_string 123, MyApp.Cldr, unit: :foot
{:ok, "123 feet"}
iex> Cldr.Unit.to_string Decimal.new(123), MyApp.Cldr, unit: :foot
{:ok, "123 feet"}
iex> Cldr.Unit.to_string 123, MyApp.Cldr, unit: :megabyte, locale: "en", style: :unknown
{:error, {Cldr.UnknownFormatError, "The unit style :unknown is not known."}}
"""
@spec to_string(
Unit.value() | Unit.t() | list(Unit.t()),
Cldr.backend() | Keyword.t(),
Keyword.t()
) ::
{:ok, String.t()} | {:error, {atom, binary}}
def to_string(list_or_unit, backend, options \\ [])
# Options but no backend
def to_string(list_or_unit, options, []) when is_list(options) do
Format.to_string(list_or_unit, options, [])
end
def to_string(list_or_unit, backend, options) do
Format.to_string(list_or_unit, backend, options)
end
@doc """
Formats a number into a string according to a unit definition
for the current process's locale and backend or raises
on error.
The current process's locale is set with
`Cldr.put_locale/1`.
See `Cldr.Unit.to_string!/3` for full details.
"""
@spec to_string!(list_or_number :: Unit.value() | Unit.t() | [Unit.t()]) ::
String.t() | no_return()
def to_string!(unit) do
Format.to_string!(unit)
end
@doc """
Formats a number into a string according to a unit definition
for the current process's locale and backend or raises
on error.
During processing any `:format_options` of a `t:Cldr.Unit` are merged with
`options` with `options` taking precedence.
## Arguments
* `number` is any number (integer, float or Decimal) or a
`t:Cldr.Unit` struct
* `backend` is any module that includes `use Cldr` and therefore
is a `Cldr` backend module. The default is `Cldr.default_backend!/0`.
* `options` is a keyword list
## Options
* `:unit` is any unit returned by `Cldr.Unit.known_units/0`. Ignored if
the number to be formatted is a `t:Cldr.Unit` struct
* `:locale` is any valid locale name returned by `Cldr.known_locale_names/0`
or a `Cldr.LanguageTag` struct. The default is `Cldr.get_locale/0`
* `:style` is one of those returned by `Cldr.Unit.known_styles/0`.
The current styles are `:long`, `:short` and `:narrow`.
The default is `style: :long`
* Any other options are passed to `Cldr.Number.to_string/2`
which is used to format the `number`
## Returns
* `formatted_string` or
* raises an exception
## Examples
iex> Cldr.Unit.to_string! Cldr.Unit.new!(:gallon, 123), MyApp.Cldr
"123 gallons"
iex> Cldr.Unit.to_string! Cldr.Unit.new!(:gallon, 1), MyApp.Cldr
"1 gallon"
iex> Cldr.Unit.to_string! Cldr.Unit.new!(:gallon, 1), MyApp.Cldr, locale: "af"
"1 gelling"
"""
@spec to_string!(
Unit.value() | Unit.t() | list(Unit.t()),
Cldr.backend() | Keyword.t(),
Keyword.t()
) ::
String.t() | no_return()
def to_string!(unit, backend, options \\ []) do
Format.to_string!(unit, backend, options)
end
## TODO remove in ex_cldr 4.0
@doc false
@spec to_iolist(list_or_number :: Unit.value() | Unit.t() | [Unit.t()]) ::
{:ok, String.t()} | {:error, {atom, binary}}
def to_iolist(unit) do
Format.to_iolist(unit)
end
@doc false
@spec to_iolist(Cldr.Unit.value() | Cldr.Unit.t() | [Cldr.Unit.t(), ...], Keyword.t()) ::
{:ok, list()} | {:error, {atom, binary}}
def to_iolist(unit, backend, options \\ []) do
Format.to_iolist(unit, backend, options)
end
@doc false
@spec to_iolist!(Cldr.Unit.value() | Cldr.Unit.t() | [Cldr.Unit.t(), ...]) ::
list() | no_return()
def to_iolist!(unit) do
Format.to_iolist!(unit)
end
@doc false
@spec to_iolist!(Cldr.Unit.value() | Cldr.Unit.t() | [Cldr.Unit.t(), ...], Keyword.t()) ::
list() | no_return()
def to_iolist!(unit, backend, options \\ []) do
Format.to_iolist!(unit, backend, options)
end
@doc """
Inverts a unit
Only "per" units can be inverted.
"""
@spec invert(t()) :: {:ok, t()} | {:error, {module(), String.t()}}
def invert(%Unit{value: value, base_conversion: conversion} = unit)
when is_tuple(conversion) and is_number(value) do
new_unit = inverted_unit(unit)
{:ok, %{new_unit | value: invert_value(value)}}
end
def invert(%Unit{value: %Decimal{} = value, base_conversion: conversion} = unit)
when is_tuple(conversion) do
new_unit = inverted_unit(unit)
{:ok, %{new_unit | value: invert_value(value)}}
end
@per Cldr.Unit.Parser.per()
@one Decimal.new(1)
def invert(%Unit{unit: name, value: value}) when is_atom(name) do
case Atom.to_string(name) |> String.split(@per) do
[_unit_name] ->
{:error, not_invertable_error(name)}
[left, right] ->
new_name = right <> @per <> left
new_value = invert_value(value)
Cldr.Unit.new(new_name, new_value)
end
end
def invert(%Unit{} = unit) do
{:error, not_invertable_error(unit)}
end
defp invert_value(value) when is_number(value) do
1 / value
end
defp invert_value(%Decimal{} = value) do
Decimal.div(@one, value)
end
defp inverted_unit(%Unit{base_conversion: {numerator, denominator}} = unit) do
new_conversion = {denominator, numerator}
new_unit = %{unit | base_conversion: new_conversion}
new_name =
new_conversion
|> Cldr.Unit.Parser.canonical_unit_name()
|> maybe_translatable_unit()
%{new_unit | unit: new_name}
end
@doc """
Returns a boolean indicating if two units are
of the same unit category.
## Arguments
* `unit_1` and `unit_2` are any units returned by
`Cldr.Unit.new/2` or a valid unit name.
## Returns
* `true` or `false`
## Examples
iex> Cldr.Unit.compatible? :foot, :meter
true
iex> Cldr.Unit.compatible? Cldr.Unit.new!(:foot, 23), :meter
true
iex> Cldr.Unit.compatible? :foot, :liter
false
iex> Cldr.Unit.compatible? "light_year_per_second", "meter_per_gallon"
false
"""
@spec compatible?(t() | unit(), t() | unit()) :: boolean
def compatible?(unit_1, unit_2) do
case Conversion.conversion_for(unit_1, unit_2) do
{:ok, _conversion, _maybe_inverted} -> true
{:error, _error} -> false
end
end
@doc """
Return the value of the Unit struct
## Arguments
* `unit` is any unit returned by `Cldr.Unit.new/2`
## Returns
* an integer, float or Decimal representing the amount
of the unit
## Example
iex> Cldr.Unit.value Cldr.Unit.new!(:kilogram, 23)
23
"""
@spec value(unit :: t()) :: value()
def value(%Unit{value: value}) do
value
end
@doc """
Decomposes a unit into subunits.
Any list compatible units can be provided
however a list of units of decreasing scale
is recommended. For example `[:foot, :inch]`
or `[:kilometer, :meter, :centimeter, :millimeter]`
## Arguments
* `unit` is any unit returned by `Cldr.Unit.new/2`
* `unit_list` is a list of valid units (one or
more from the list returned by `Cldr.Unit.known_units/0`. All
units must be from the same unit category.
* `format_options` is a Keyword list of options
that is added to the *last* unit in `unit_list`.
The `format_options` will be applied when calling
`Cldr.Unit.to_string/3` on the `unit`. The
default is `[]`.
## Returns
* a list of units after decomposition or an error
tuple
## Examples
iex> u = Cldr.Unit.new!(10.3, :foot)
iex> Cldr.Unit.decompose u, [:foot, :inch]
[Cldr.Unit.new!(:foot, 10), Cldr.Unit.new!(:inch, "3.6")]
iex> u = Cldr.Unit.new!(:centimeter, 1111)
iex> Cldr.Unit.decompose u, [:kilometer, :meter, :centimeter, :millimeter]
[Cldr.Unit.new!(:meter, 11), Cldr.Unit.new!(:centimeter, 11)]
"""
@spec decompose(unit :: Unit.t(), unit_list :: [Unit.unit()], options :: Keyword.t()) ::
[Unit.t()]
def decompose(unit, unit_list, format_options \\ [])
def decompose(unit, [], _format_options) do
[unit]
end
# This is the last unit
def decompose(unit, [h | []], format_options) do
new_unit = Conversion.convert!(unit, h)
if zero?(new_unit) do
[]
else
[%{new_unit | format_options: format_options}]
end
end
def decompose(unit, [h | t], format_options) do
new_unit = Conversion.convert!(unit, h)
{integer_unit, remainder} = int_rem(new_unit)
if zero?(integer_unit) do
decompose(remainder, t, format_options)
else
[integer_unit | decompose(remainder, t, format_options)]
end
end
@doc """
Localizes a unit according to the current
processes locale and backend.
The current process's locale is set with
`Cldr.put_locale/1`.
See `Cldr.Unit.localize/3` for further
details.
"""
@spec localize(t()) :: [t(), ...]
def localize(%Unit{} = unit) do
locale = Cldr.get_locale()
backend = locale.backend
localize(unit, backend, locale: locale)
end
@doc """
Localizes a unit according to a territory
A territory can be derived from a `t:Cldr.Locale.locale_name`
or `t:Cldr.LangaugeTag`.
Use this function if you have a unit which
should be presented in a user interface using
units relevant to the audience. For example, a
unit `#Cldr.Unit100, :meter>` might be better
presented to a US audience as `#Cldr.Unit<328, :foot>`.
## Arguments
* `unit` is any unit returned by `Cldr.Unit.new/2`
* `backend` is any module that includes `use Cldr` and therefore
is a `Cldr` backend module.
* `options` is a keyword list of options
## Options
* `:locale` is any valid locale name returned by `Cldr.known_locale_names/0`
or a `Cldr.LanguageTag` struct. The default is `backend.get_locale/0`.
* `:territory` is any valid territory code returned by
`Cldr.known_territories/0`. The default is the territory defined
as part of the `:locale`. The option `:territory` has a precedence
over the territory in a locale.
* `:usage` is the way in which the unit is intended
to be used. The available `usage` varyies according
to the unit category. See `Cldr.Unit.preferred_units/3`.
## Examples
iex> unit = Cldr.Unit.new!(1.83, :meter)
iex> Cldr.Unit.localize(unit, usage: :person_height, territory: :US)
[
Cldr.Unit.new!(:foot, 6, usage: :person_height),
Cldr.Unit.new!(:inch, "0.04724409448818897637795275598", usage: :person_height)
]
"""
@spec localize(t(), Cldr.backend(), Keyword.t()) :: [t(), ...]
def localize(unit, backend, options \\ [])
def localize(%Unit{} = unit, options, []) when is_list(options) do
locale = Cldr.get_locale()
options = Keyword.merge([locale: locale], options)
localize(unit, locale.backend, options)
end
def localize(%Unit{} = unit, backend, options) when is_atom(backend) do
with {:ok, unit_list, format_options} <- Preference.preferred_units(unit, backend, options) do
unit = %{unit | usage: options[:usage] || unit.usage}
decompose(unit, unit_list, format_options)
end
end
@doc """
Returns the localized display name
for a unit.
The returned text is generally suitable
for including in UI elements such as
selection boxes.
## Arguments
* `unit` is any `t:Cldr.Unit` or any
unit name returned by `Cldr.Unit.known_units/0`.
* `options` is a keyword list of options.
## Options
* `:locale` is any valid locale name returned by `Cldr.known_locale_names/0`
or a `Cldr.LanguageTag` struct. The default is `Cldr.get_locale/0`.
* `backend` is any module that includes `use Cldr` and therefore
is a `Cldr` backend module. The default is `Cldr.default_backend!/0`.
* `:style` is one of those returned by `Cldr.Unit.available_styles`.
The current styles are `:long`, `:short` and `:narrow`.
The default is `style: :long`.
## Examples
iex> Cldr.Unit.display_name :liter
"liters"
iex> Cldr.Unit.display_name :liter, locale: "fr"
"litres"
iex> Cldr.Unit.display_name :liter, locale: "fr", style: :short
"l"
"""
@spec display_name(Cldr.Unit.value() | Cldr.Unit.t(), Keyword.t()) ::
String.t() | {:error, {module, binary}}
def display_name(unit, options \\ [])
def display_name(%Unit{unit: unit}, options) do
display_name(unit, options)
end
def display_name(unit, options) when unit in @translatable_units do
style = Keyword.get(options, :style, @default_style)
{locale, backend} = Cldr.locale_and_backend_from(options)
with {:ok, locale} <- Cldr.validate_locale(locale, backend),
{:ok, style} <- validate_style(style) do
locale
|> units_for(style, backend)
|> Map.fetch!(unit)
|> Map.fetch!(:display_name)
end
end
def display_name(unit, _options) do
if match?({:ok, _unit, _conversion}, validate_unit(unit)) do
{:error, unit_not_translatable_error(unit)}
else
{:error, unit_error(unit)}
end
end
@doc """
Returns a new unit of the same unit
type but with a zero value.
## Argument
* `unit` is any unit returned by `Cldr.Unit.new/2`
## Example
iex> u = Cldr.Unit.new!(:foot, 23.3)
Cldr.Unit.new!(:foot, "23.3")
iex> Cldr.Unit.zero(u)
Cldr.Unit.new!(:foot, 0)
"""
def zero(%Unit{value: _value} = unit) do
%Unit{unit | value: 0}
end
@doc """
Returns a boolean indicating whether a given unit
has a zero value.
## Argument
* `unit` is any unit returned by `Cldr.Unit.new/2`
## Examples
iex> u = Cldr.Unit.new!(:foot, 23.3)
Cldr.Unit.new!(:foot, 23.3)
iex> Cldr.Unit.zero?(u)
false
iex> u = Cldr.Unit.new!(:foot, 0)
Cldr.Unit.new!(:foot, 0)
iex> Cldr.Unit.zero?(u)
true
"""
def zero?(%Unit{value: value}) when is_number(value) do
value == 0
end
@decimal_0 Decimal.new(0)
def zero?(%Unit{value: %Decimal{} = value}) do
Cldr.Decimal.compare(value, @decimal_0) == :eq
end
@system_units @units
|> Map.get(:conversions)
|> Enum.flat_map(fn {unit, conversion} ->
Enum.map(conversion.systems, fn system -> {system, unit} end)
end)
|> Enum.group_by(fn {system, _unit} -> system end, fn {_system, unit} ->
unit
end)
@doc """
Returns the list of units defined in a given
measurement system.
## Arguments
* `system` is any measurement system returned by
`Cldr.Unit.known_measurement_systems/0`
## Returns
* A list of translatable units as atoms or
* `{:error, {exception, message}}`
## Example
=> Cldr.Unit.measurement_system_units :uksystem
[
:ton,
:inch,
:yard,
...
]
"""
@doc since: "3.4.0"
@spec measurement_system_units(measurement_system()) ::
[translatable_unit(), ...] | {:error, {module(), String.t()}}
def measurement_system_units(system) when system in @system_names do
Map.get(@system_units, system)
end
def measurement_system_units(system) do
{:error, unknown_measurement_system_error(system)}
end
@doc """
Returns a boolean indicating if a given
unit belongs to one or more measurement
systems.
When a list or more than one measurement
system is provided, the test is one of
inclusion. That is, if the unit belongs to
any of the provided measurement systems
the return is `true`.
## Arguments
* `system` is any measurement system or list
of measurement systems returned by
`Cldr.Unit.known_measurement_systems/0`
## Returns
* `true` or `false` or
* `{:error, {exception, message}}`
## Examples
iex> Cldr.Unit.measurement_system? :foot, :uksystem
true
iex> Cldr.Unit.measurement_system? :foot, [:uksystem, :ussystem]
true
iex> Cldr.Unit.measurement_system? :foot, [:metric]
false
iex> Cldr.Unit.measurement_system? :invalid, [:metric]
{:error, {Cldr.UnknownUnitError, "The unit :invalid is not known."}}
"""
@doc since: "3.4.0"
@spec measurement_system?(t() | unit, measurement_system | list(measurement_system)) ::
boolean() | {:error, {module(), String.t()}}
def measurement_system?(unit, system) when is_atom(system) do
measurement_system?(unit, [system])
end
def measurement_system?(%Unit{unit: unit}, systems) when is_list(systems) do
measurement_system?(unit, systems)
end
def measurement_system?(unit, systems) when unit in @translatable_units and is_list(systems) do
Enum.any?(measurement_systems_for_unit(unit), &(&1 in systems))
end
def measurement_system?(_unit, systems) when not is_list(systems) do
{:error, unknown_measurement_system_error(systems)}
end
def measurement_system?(unit, _systems) do
{:error, unit_error(unit)}
end
@systems_for_unit @units
|> Map.get(:conversions)
|> Enum.map(fn {unit, conversion} -> {unit, conversion.systems} end)
|> Kernel.++(Cldr.Unit.Additional.systems_for_units())
|> Map.new()
@doc """
Returns the measurement systems for a given
unit.
## Arguments
* `unit` is any `t:Cldr.Unit` or any unit
returned by `Cldr.Unit.known_units/0` or a
string unit name.
## Returns
* A list of measurement systems to which
the `unit` belongs.
* `{:error, {exception, message}}`
## Examples
iex> Cldr.Unit.measurement_systems_for_unit :foot
[:ussystem, :uksystem]
iex> Cldr.Unit.measurement_systems_for_unit :meter
[:metric, :si]
iex> Cldr.Unit.measurement_systems_for_unit :invalid
{:error, {Cldr.UnknownUnitError, "The unit :invalid is not known."}}
"""
@doc since: "3.4.0"
@spec measurement_systems_for_unit(t() | unit()) ::
[measurement_system(), ...] | {:error, {module(), String.t()}}
def measurement_systems_for_unit(%Unit{unit: unit}) do
measurement_systems_for_unit(unit)
end
def measurement_systems_for_unit(unit) when unit in @translatable_units do
case Map.fetch(@systems_for_unit, unit) do
{:ok, systems} -> systems
:error -> measurement_systems_for_unit(Kernel.to_string(unit))
end
end
# Strip SI and power factors amd try the root
# unit
for prefix <- Cldr.Unit.Prefix.prefixes() do
def measurement_systems_for_unit(unquote(prefix) <> unit) do
with {:ok, unit, _conversion} <- Cldr.Unit.validate_unit(unit) do
measurement_systems_for_unit(unit)
end
end
end
def measurement_systems_for_unit("per_" <> unit) do
measurement_systems_for_unit(unit)
end
# Decompose the unit recursively until there is a match on
# a base unit, otherwise return an error
def measurement_systems_for_unit(unit) when is_binary(unit) do
[first | rest] = String.split(unit, "_", parts: 2)
with {:ok, part_unit, _conversion} <- Cldr.Unit.validate_unit(first) do
measurement_systems_for_unit(part_unit)
else
_other ->
if rest == [], do: {:error, unit_error(unit)}, else: measurement_systems_for_unit(hd(rest))
end
end
def measurement_systems_for_unit(unit) do
{:error, unit_error(unit)}
end
@doc """
Return a list of known measurement systems.
## Example
iex> Cldr.Unit.known_measurement_systems()
%{
metric: %{alias: nil, description: "Metric System"},
uksystem: %{
alias: :imperial,
description: "UK System of measurement: feet, pints, etc.; pints are 20oz"
},
ussystem: %{alias: nil, description: "US System of measurement: feet, pints, etc.; pints are 16oz"},
si: %{alias: nil, description: "SI System"}
}
"""
@spec known_measurement_systems ::
%{measurement_system() => %{alias: atom(), description: String.t()}}
def known_measurement_systems do
@measurement_systems
end
@doc """
Return a list of known measurement system names.
## Example
iex> Cldr.Unit.known_measurement_system_names()
[:metric, :si, :uksystem, :ussystem]
"""
@doc since: "3.5.0"
@spec known_measurement_system_names :: [measurement_system(), ...]
def known_measurement_system_names do
@system_names
end
@doc """
Determines the preferred measurement system
from a locale.
See also `Cldr.Unit.known_measurement_systems/0`.
## Arguments
* `locale` is any valid locale name returned by
`Cldr.known_locale_names/0` or a `t:Cldr.LanguageTag`
struct. The default is `Cldr.get_locale/0`.
* `key` is any measurement system key.
The known keys are `:default`, `:temperature`
and `:paper_size`. The default key is `:default`.
## Examples
iex> Cldr.Unit.measurement_system_from_locale "en"
:ussystem
iex> Cldr.Unit.measurement_system_from_locale "en-GB"
:uksystem
iex> Cldr.Unit.measurement_system_from_locale "en-AU"
:metric
iex> Cldr.Unit.measurement_system_from_locale "en-AU-u-ms-ussystem"
:ussystem
iex> Cldr.Unit.measurement_system_from_locale "en-GB", :temperature
:uksystem
iex> Cldr.Unit.measurement_system_from_locale "en-AU", :paper_size
:a4
iex> Cldr.Unit.measurement_system_from_locale "en-GB", :invalid
{:error,
{Cldr.Unit.InvalidSystemKeyError,
"The key :invalid is not known. Valid keys are :default, :paper_size and :temperature"}}
"""
@doc since: "3.4.0"
@spec measurement_system_from_locale(
Cldr.LanguageTag.t() | Cldr.Locale.locale_name(),
measurement_system_key() | Cldr.backend()
) ::
measurement_system() | {:error, {module(), String.t()}}
def measurement_system_from_locale(locale \\ Cldr.get_locale(), key \\ :default)
def measurement_system_from_locale(locale, backend_or_key) when is_binary(locale) do
case Cldr.validate_backend(backend_or_key) do
{:ok, backend} ->
with {:ok, locale} <- Cldr.validate_locale(locale, backend) do
measurement_system_from_locale(locale)
end
{:error, _} ->
with {:ok, locale} <- Cldr.validate_locale(locale) do
measurement_system_from_locale(locale, backend_or_key)
end
end
end
def measurement_system_from_locale(%LanguageTag{locale: %{ms: :imperial}}, _key) do
:uksystem
end
def measurement_system_from_locale(%LanguageTag{locale: %{ms: system}}, _key)
when not is_nil(system) do
system
end
def measurement_system_from_locale(%Cldr.LanguageTag{} = locale, key) do
territory = Cldr.Locale.territory_from_locale(locale)
measurement_system_for_territory(territory, key)
end
@doc since: "3.4.0"
@spec measurement_system_from_locale(
Locale.locale_reference(),
Cldr.backend(),
measurement_system_key()
) ::
measurement_system() | {:error, {module(), String.t()}}
def measurement_system_from_locale(locale, backend, key) do
with {:ok, locale} <- Cldr.validate_locale(locale, backend) do
measurement_system_from_locale(locale, key)
end
end
@category_usage @units
|> Map.get(:preferences)
|> Enum.map(fn {k, v} -> {k, Map.keys(v) |> Enum.sort()} end)
|> Map.new()
@doc """
Returns a mapping between Unit categories
and the uses they define.
## Example
iex> Cldr.Unit.unit_category_usage()
%{
area: [:default, :floor, :geograph, :land],
concentration: [:blood_glucose, :default],
consumption: [:default, :vehicle_fuel],
duration: [:default, :media],
energy: [:default, :food],
length: [:default, :focal_length, :person, :person_height, :rainfall, :road,
:snowfall, :vehicle, :visiblty],
mass: [:default, :person],
mass_density: [:default],
power: [:default, :engine],
pressure: [:baromtrc, :default],
speed: [:default, :rainfall, :snowfall, :wind],
temperature: [:default, :weather],
volume: [:default, :fluid, :oil, :vehicle],
year_duration: [:default, :person_age]
}
"""
def unit_category_usage do
@category_usage
end
@doc """
Returns a mapping from unit categories to the
base unit.
"""
@base_units @units
|> Map.get(:base_units)
|> Kernel.++(Cldr.Unit.Additional.base_units())
|> Enum.uniq()
|> Map.new()
def base_units do
@base_units
end
@doc """
Returns the base unit for a given unit.
## Argument
* `unit` is either a `t:Cldr.Unit`, an `atom` or
a `t:String`
## Returns
* `{:ok, base_unit}` or
* `{:error, {exception, reason}}`
## Example
iex> Cldr.Unit.base_unit :square_kilometer
{:ok, :square_meter}
iex> Cldr.Unit.base_unit :square_table
{:error, {Cldr.UnknownUnitError, "Unknown unit was detected at \\"table\\""}}
"""
def base_unit(%Unit{base_conversion: conversion}) do
BaseUnit.canonical_base_unit(conversion)
end
def base_unit(unit_name) when is_atom(unit_name) or is_binary(unit_name) do
with {:ok, _unit, conversion} <- Cldr.Unit.validate_unit(unit_name) do
BaseUnit.canonical_base_unit(conversion)
end
end
@deprecated "Use `Cldr.Unit.known_unit_categories/0"
defdelegate unit_categories(), to: __MODULE__, as: :known_unit_categories
@unit_category_inverse_map Cldr.Map.invert(@units_by_category) |> Cldr.Map.stringify_keys()
@doc false
def unit_category_inverse_map do
@unit_category_inverse_map
end
@doc """
Returns the units category for a given unit
## Options
* `unit` is any unit returned by
`Cldr.Unit.new/2`
## Returns
* `{:ok, category}` or
* `{:error, {exception, message}}`
## Examples
iex> Cldr.Unit.unit_category :pint_metric
{:ok, :volume}
iex> Cldr.Unit.unit_category :stone
{:ok, :mass}
iex> Cldr.Unit.unit_category :watt
{:ok, :power}
iex> Cldr.Unit.unit_category "kilowatt hour"
{:ok, :energy}
iex> Cldr.Unit.unit_category "watt hour per light year"
{:error,
{Cldr.Unit.UnknownCategoryError,
"The category for \\"watt hour per light year\\" is not known."}}
"""
@spec unit_category(Unit.t() | String.t() | atom()) ::
{:ok, category()} | {:error, {module(), String.t()}}
def unit_category(unit) when unit in @translatable_units do
case Map.fetch(@unit_category_inverse_map, Kernel.to_string(unit)) do
{:ok, category} -> {:ok, category}
:error -> {:error, unknown_category_error(unit)}
end
end
def unit_category(unit) do
with {:ok, resolved_unit, conversion} <- validate_unit(unit) do
if resolved_unit in @translatable_units do
unit_category(resolved_unit)
else
unit_category(unit, conversion)
end
end
end
@doc false
def unit_category(unit, conversion) do
with {:ok, base_unit} <- BaseUnit.canonical_base_unit(conversion),
{:ok, category} <- Map.fetch(@unit_category_inverse_map, Kernel.to_string(base_unit)) do
{:ok, category}
else
:error -> {:error, unknown_category_error(unit)}
other -> other
end
end
@deprecated "Please use `Cldr.Unit.unit_category/1"
def unit_type(unit) do
unit_category(unit)
end
@doc """
Return the grammatical gender for a
unit.
## Arguments
## Options
## Returns
## Examples
"""
@unknown_gender :undefined
@doc since: "3.5.0"
@spec grammatical_gender(t(), Keyword.t()) :: grammatical_gender()
def grammatical_gender(unit, options \\ [])
def grammatical_gender(%__MODULE__{} = unit, options) when is_list(options) do
{locale, backend} = Cldr.locale_and_backend_from(options)
module = Module.concat(backend, :Unit)
units = units_for(locale, :long)
features =
module.grammatical_features(@root_locale_name)
|> Map.merge(module.grammatical_features(locale))
|> Map.fetch!(:gender)
Cldr.Unit.Format.traverse(unit, fn
{:unit, unit} -> Map.fetch!(units, unit) |> Map.get(:gender, @unknown_gender)
{:times, left_right} -> elem(left_right, features.times)
{:per, left_right} -> elem(left_right, features.per)
{:prefix, left_right} -> elem(left_right, features.prefix + 1)
{:power, left_right} -> elem(left_right, features.power + 1)
end)
end
def grammatical_gender(unit, options) when is_binary(unit) do
grammatical_gender(new!(1, unit), options)
end
@base_unit_category_map Cldr.Config.units()
|> Map.get(:base_units)
# |> Kernel.++(Cldr.Unit.Additional.base_units())
|> Enum.map(fn {k, v} -> {Kernel.to_string(v), k} end)
|> Map.new()
@doc """
Returns a mapping of base units to their respective
unit categories.
Base units are a common unit for a given unit
category which are used in two scenarios:
1. When converting between units. If two units
have the same base unit they can be converted
to each other. See `Cldr.Unit.Conversion`.
2. When identifying the preferred units for a given
locale or territory, the base unit is used to
aid identification of preferences for given use
cases. See `Cldr.Unit.Preference`.
## Example
=> Cldr.Unit.base_unit_category_map
%{
"kilogram_square_meter_per_cubic_second_ampere" => :voltage,
"kilogram_meter_per_meter_square_second" => :torque,
"square_meter" => :area,
"kilogram" => :mass,
"kilogram_square_meter_per_square_second" => :energy,
"revolution" => :angle,
"candela_per_square_meter" => :luminance,
...
}
"""
@spec base_unit_category_map :: map()
def base_unit_category_map do
@base_unit_category_map
end
@doc """
Returns the known styles for a unit.
## Example
iex> Cldr.Unit.known_styles()
[:long, :short, :narrow]
"""
@spec known_styles :: [style(), ...]
def known_styles do
@styles
end
@deprecated "Use Cldr.Unit.known_styles/0"
defdelegate styles, to: __MODULE__, as: :known_styles
@doc """
Returns the default formatting style.
## Example
iex> Cldr.Unit.default_style()
:long
"""
@spec default_style :: style()
def default_style do
@default_style
end
# Returns a map of unit preferences
#
# Units of measure vary country by country. While
# most countries standardize on the metric system,
# others use the US or UK systems of measure.
#
# When presening a unit to an end user it is appropriate
# to do so using units familiar and relevant to that
# end user.
#
# The data returned by this function supports the
# opportunity to convert a given unit to meet this
# requirement.
#
# Unit preferences can vary by usage, not just territory,
# Therefore the data is structured according to unit
# category and unit usage.
#
# This function is called at compile time to generate
# preference functions in `Cldr.Unit.Preference`.
@doc false
@unit_preferences Cldr.Config.units() |> Map.get(:preferences)
@spec unit_preferences() :: map()
@rounding 10
def unit_preferences do
for {category, usages} <- @unit_preferences, into: Map.new() do
usages =
for {usage, preferences} <- usages, into: Map.new() do
preferences =
Cldr.Enum.reduce_peeking(preferences, [], fn
%{regions: regions} = pref, [%{regions: regions} | _rest], acc ->
%{units: units, geq: geq} = pref
value =
Unit.new!(hd(units), geq)
|> Conversion.convert_to_base_unit!()
|> Math.round(@rounding)
|> Map.get(:value)
{:cont, acc ++ [%{pref | geq: to_float(value)}]}
pref, _rest, acc ->
pref = %{pref | geq: 0}
{:cont, acc ++ [pref]}
end)
{usage, preferences}
end
{category, usages}
end
end
@doc false
def rounding do
@rounding
end
@doc false
def units_for(locale, style \\ default_style(), backend \\ default_backend()) do
module = Module.concat(backend, Elixir.Unit)
module.units_for(locale, style)
end
@systems_by_territory Cldr.Config.territories()
|> Enum.map(fn {k, v} -> {k, v.measurement_system} end)
|> Map.new()
@doc """
Returns a map of measurement systems by territory.
## Example
=> Cldr.Unit.measurement_systems_by_territory
%{
KE: %{default: :metric, paper_size: :a4, temperature: :metric},
GU: %{default: :metric, paper_size: :a4, temperature: :metric},
...
}
"""
@spec measurement_systems_by_territory() :: %{Locale.territory_code() => map()}
def measurement_systems_by_territory do
@systems_by_territory
end
@deprecated "Use Cldr.Unit.measurement_systems_by_territory/0"
defdelegate measurement_systems(), to: __MODULE__, as: :measurement_systems_by_territory
@doc """
Returns the default measurement system for a territory
and a given system key.
## Arguments
* `territory` is any valid territory returned by
`Cldr.validate_territory/1`
* `key` is any measurement system key.
The known keys are `:default`, `:temperature`
and `:paper_size`. The default key is `:default`.
## Examples
iex> Cldr.Unit.measurement_system_for_territory :US
:ussystem
iex> Cldr.Unit.measurement_system_for_territory :GB
:uksystem
iex> Cldr.Unit.measurement_system_for_territory :AU
:metric
iex> Cldr.Unit.measurement_system_for_territory :US, :temperature
:ussystem
iex> Cldr.Unit.measurement_system_for_territory :GB, :temperature
:uksystem
iex> Cldr.Unit.measurement_system_for_territory :GB, :volume
{:error,
{Cldr.Unit.InvalidSystemKeyError,
"The key :volume is not known. Valid keys are :default, :paper_size and :temperature"}}
"""
@spec measurement_system_for_territory(atom(), atom()) ::
:metric | :ussystem | :uksystem | :a4 | :us_letter | {:error, {module(), String.t()}}
def measurement_system_for_territory(territory, category \\ :default)
def measurement_system_for_territory(territory, :default = key) do
do_measurement_system_for_territory(territory, key, :metric)
end
def measurement_system_for_territory(territory, :paper_size = key) do
do_measurement_system_for_territory(territory, key, :a4)
end
def measurement_system_for_territory(territory, :temperature = key) do
do_measurement_system_for_territory(territory, key, :metric)
end
def measurement_system_for_territory(_territory, key) do
{:error, invalid_system_key_error(key)}
end
defp do_measurement_system_for_territory(territory, key, default) do
with {:ok, territory} <- Cldr.validate_territory(territory) do
get_in(measurement_systems_by_territory(), [territory, key]) || default
end
end
@doc """
Validates a unit name and normalizes it,
A unit name can be expressed as:
* an `atom()` in which case the unit must be
localizable in CLDR directly
* or a `t:String` in which case it is parsed
into a list of composable subunits that
can be converted but are not guaranteed to
be output as a localized string.
## Arguments
* `unit_name` is an `atom()` or `t:String`, supplied
as is or as part of an `t:Cldr.Unit` struct.
## Returns
* `{:ok, canonical_unit_name, conversion}` where
`canonical_unit_name` is the normalized unit name
and `conversion` is an opaque structure used
to convert this this unit into its base unit or
* `{:error, {exception, reason}}`
## Notes
A returned `unit_name` that is an atom is directly
localisable (CLDR has translation data for the unit).
A `unit_name` that is a `t:String` is composed of
one or more unit names that need to be resolved in
order for the `unit_name` to be localised.
The difference is an implementation detail and should
not be of concern to the user of this library.
## Examples
iex> Cldr.Unit.validate_unit :meter
{
:ok,
:meter,
[meter: %Cldr.Unit.Conversion{base_unit: [:meter], factor: 1, offset: 0}]
}
iex> Cldr.Unit.validate_unit "meter"
{:ok, :meter,
[meter: %Cldr.Unit.Conversion{base_unit: [:meter], factor: 1, offset: 0}]}
iex> Cldr.Unit.validate_unit "miles_per_liter"
{:error, {Cldr.UnknownUnitError, "Unknown unit was detected at \\"s\\""}}
iex> Cldr.Unit.validate_unit "mile_per_liter"
{:ok, "mile_per_liter",
{[
mile: %Cldr.Unit.Conversion{
factor: Decimal.new("1609.3440"),
offset: 0,
base_unit: [:meter]
}
],
[
liter: %Cldr.Unit.Conversion{
factor: Decimal.new("0.001"),
offset: 0,
base_unit: [:cubic_meter]
}
]}}
"""
def validate_unit(unit_name) when unit_name in @translatable_units do
{:ok, unit_name, Conversions.conversion_for!(unit_name)}
end
@aliases Alias.aliases() |> Map.keys() |> Enum.sort()
def validate_unit(unit_name) when unit_name in @aliases do
unit_name
|> Alias.alias()
|> validate_unit()
end
def validate_unit(unit_name) when is_atom(unit_name) do
unit_name
|> Atom.to_string()
|> validate_unit()
end
def validate_unit(unit_name) when is_binary(unit_name) do
unit_name
|> normalize_unit_name()
|> maybe_translatable_unit()
|> return_parsed_unit()
end
def validate_unit(%Unit{unit: unit_name, base_conversion: base_conversion}) do
{:ok, unit_name, base_conversion}
end
def validate_unit(unknown_unit) do
{:error, unit_error(unknown_unit)}
end
defp return_parsed_unit(unit_name) when is_atom(unit_name) do
validate_unit(unit_name)
end
defp return_parsed_unit(unit_name) do
with {:ok, parsed} <- Parser.parse_unit(unit_name) do
name =
parsed
|> Parser.canonical_unit_name()
|> maybe_translatable_unit()
{:ok, name, parsed}
end
end
@doc false
def normalize_unit_name(name) when is_binary(name) do
String.replace(name, [" ", "-"], "_")
end
@doc false
def maybe_translatable_unit(name) do
atom_name = String.to_existing_atom(name)
if atom_name in known_units(), do: atom_name, else: name
rescue
ArgumentError ->
name
end
@doc """
Validates a unit style and normalizes it to a
standard downcased atom form
"""
def validate_style(style) when style in @styles do
{:ok, style}
end
def validate_style(style) when is_binary(style) do
style
|> String.downcase()
|> String.to_existing_atom()
|> validate_style()
catch
ArgumentError ->
{:error, style_error(style)}
end
def validate_style(style) do
{:error, style_error(style)}
end
@doc """
Validates a grammatical case and normalizes it to a
standard downcased atom form
"""
@doc since: "3.5.0"
def validate_grammatical_case(grammatical_case) when grammatical_case in @grammatical_case do
{:ok, grammatical_case}
end
def validate_grammatical_case(grammatical_case) when is_binary(grammatical_case) do
grammatical_case
|> String.downcase()
|> String.to_existing_atom()
|> validate_grammatical_case()
catch
ArgumentError ->
{:error, grammatical_case_error(grammatical_case)}
end
def validate_grammatical_case(grammatical_case) do
{:error, grammatical_case_error(grammatical_case)}
end
@doc false
def validate_grammatical_gender(nil, default_gender, locale) do
validate_grammatical_gender(default_gender, locale)
end
def validate_grammatical_gender(grammatical_gender, _default_gender, locale) do
validate_grammatical_gender(grammatical_gender, locale)
end
@doc """
Validates a grammatical gender and normalizes it to a
standard downcased atom form
"""
@doc since: "3.5.0"
def validate_grammatical_gender(grammatical_gender, locale \\ Cldr.default_locale())
def validate_grammatical_gender(grammatical_gender, %LanguageTag{} = locale)
when is_atom(grammatical_gender) do
with {:ok, genders} = Module.concat(locale.backend, :Unit).grammatical_gender(locale) do
if grammatical_gender in genders do
{:ok, grammatical_gender}
else
{:error, grammatical_gender_error(grammatical_gender, genders, locale)}
end
end
end
def validate_grammatical_gender(grammatical_gender, %LanguageTag{} = locale)
when is_binary(grammatical_gender) do
grammatical_gender
|> String.downcase()
|> String.to_existing_atom()
|> validate_grammatical_gender(locale)
catch
ArgumentError ->
{:error, grammatical_gender_error(grammatical_gender, locale)}
end
@doc """
Convert a Decimal or integer `t:Unit` to a float `t:Unit`.
"""
@doc since: "3.5.0"
def to_float_unit(%Unit{value: value} = unit) when is_integer(value) do
value = 1.0 * value
%{unit | value: value}
end
def to_float_unit(%Unit{value: %Decimal{} = value} = unit) do
value = Decimal.to_float(value)
%{unit | value: value}
end
def to_float_unit(%Unit{} = other) do
other
end
@deprecated "Use Cldr.Unit.to_float_unit/1"
defdelegate ratio_to_float(unit), to: __MODULE__, as: :to_float_unit
@doc """
Convert a float or integer `t:Unit` to a Decimal `t:Unit`.
"""
@doc since: "3.5.0"
def to_decimal_unit(%Unit{value: value} = unit) when is_float(value) do
value = Decimal.from_float(value)
%{unit | value: value}
end
def to_decimal_unit(%Unit{value: value} = unit) when is_integer(value) do
value = Decimal.new(value)
%{unit | value: value}
end
def to_decimal_unit(%Unit{} = other) do
other
end
@deprecated "Use Cldr.Unit.to_decimal_unit/1"
defdelegate ratio_to_decimal(unit), to: __MODULE__, as: :to_decimal_unit
@doc false
def unknown_base_unit_error(unit_name) do
{Cldr.Unit.UnknownBaseUnitError, "Base unit for #{inspect(unit_name)} is not known"}
end
@doc false
def unit_error(nil) do
{
Cldr.UnknownUnitError,
"A unit must be provided, for example 'Cldr.Unit.string(123, unit: :meter)'."
}
end
def unit_error([unit]) do
{Cldr.UnknownUnitError, "The unit #{inspect(unit)} is not known."}
end
def unit_error(units) when is_list(units) do
units = Enum.sort(units)
{Cldr.UnknownUnitError, "The units #{inspect(units)} are not known."}
end
def unit_error(unit) do
{Cldr.UnknownUnitError, "The unit #{inspect(unit)} is not known."}
end
@doc false
def unit_category_error(category) do
{Cldr.Unit.UnknownUnitCategoryError, "The unit category #{inspect(category)} is not known."}
end
@doc false
def unit_categories_error([category]) do
unit_category_error(category)
end
@doc false
def unit_categories_error(categories) do
{Cldr.Unit.UnknownUnitCategoryError,
"The unit categories #{inspect(categories)} are not known."}
end
@doc false
def unknown_category_error(unit) do
{Cldr.Unit.UnknownCategoryError, "The category for #{inspect(unit)} is not known."}
end
@doc false
def style_error(style) do
{Cldr.UnknownFormatError, "The unit style #{inspect(style)} is not known."}
end
@doc false
def grammatical_case_error(grammatical_case) do
{
Cldr.UnknownGrammaticalCaseError,
"The grammatical case #{inspect(grammatical_case)} " <>
"is not known. The valid cases are #{inspect(@grammatical_case)}"
}
end
@doc false
def grammatical_gender_error(grammatical_gender, known_genders, locale) do
{
Cldr.UnknownGrammaticalGenderError,
"The locale #{inspect(locale.cldr_locale_name)} does not define " <>
"a grammatical gender #{inspect(grammatical_gender)}. " <>
"The valid genders are #{inspect(known_genders)}"
}
end
def grammatical_gender_error(grammatical_gender, _locale) do
{
Cldr.UnknownGrammaticalGenderError,
"The grammatical gender #{inspect(grammatical_gender)} is invalid"
}
end
@doc false
def incompatible_units_error(%Unit{unit: unit_1}, unit_2) do
incompatible_units_error(unit_1, unit_2)
end
def incompatible_units_error(unit_1, %Unit{unit: unit_2}) do
incompatible_units_error(unit_1, unit_2)
end
def incompatible_units_error(unit_1, unit_2) do
{
Unit.IncompatibleUnitsError,
"Operations can only be performed between units with the same base unit. " <>
"Received #{inspect(unit_1)} and #{inspect(unit_2)}"
}
end
@doc false
def unknown_usage_error(category, usage) do
{
Cldr.Unit.UnknownUsageError,
"The unit category #{inspect(category)} does not define a usage #{inspect(usage)}"
}
end
@doc false
def unit_not_translatable_error(unit) do
{
Cldr.Unit.UnitNotTranslatableError,
"The unit #{inspect(unit)} is not translatable"
}
end
@doc false
def unknown_measurement_system_error(system) do
{
Cldr.Unit.UnknownMeasurementSystemError,
"The measurement system #{inspect(system)} is not known"
}
end
@doc false
def invalid_system_key_error(key) do
{
Cldr.Unit.InvalidSystemKeyError,
"The key #{inspect(key)} is not known. " <>
"Valid keys are :default, :paper_size and :temperature"
}
end
@doc false
def no_pattern_error(unit, locale, style) do
{
Cldr.Unit.NoPatternError,
"No localisation pattern was found for unit #{inspect(unit)} in " <>
"locale #{inspect(locale.requested_locale_name)} for " <>
"style #{inspect(style)}"
}
end
@doc false
def not_invertable_error(unit) do
{
Cldr.Unit.NotInvertableError,
"The unit #{inspect(unit)} cannot be inverted. Only compound 'per' units " <>
"can be inverted"
}
end
@doc false
def not_parseable_error(string) do
{
Cldr.Unit.NotParseableError,
"The string #{inspect(string)} could not be parsed as a unit and a value"
}
end
@doc false
def ambiguous_unit_error(unit, units) do
units = Enum.sort(units)
{
Cldr.Unit.AmbiguousUnitError,
"The string #{inspect(String.trim(unit))} ambiguously resolves to #{inspect(units)}"
}
end
@doc false
defp category_unit_match_error(unit, only, {[], []}) do
{
Cldr.Unit.CategoryMatchError,
"None of the units #{inspect(Enum.sort(unit))} belong to a unit or category matching " <>
"only: #{inspect(flatten(only))}"
}
end
defp category_unit_match_error(unit, {[], []}, except) do
{
Cldr.Unit.CategoryMatchError,
"None of the units #{inspect(Enum.sort(unit))} belong to a unit or category matching " <>
"except: #{inspect(flatten(except))}"
}
end
defp category_unit_match_error(unit, only, except) do
{
Cldr.Unit.CategoryMatchError,
"None of the units #{inspect(Enum.sort(unit))} belong to a unit or category matching " <>
"only: #{inspect(flatten(only))} except: #{inspect(flatten(except))}"
}
end
defp flatten(tuple) when is_tuple(tuple) do
tuple
|> Tuple.to_list()
|> List.flatten()
end
defp int_rem(unit) do
integer_unit = Unit.round(unit, 0, :down) |> Math.trunc()
remainder = Math.sub(unit, integer_unit)
{integer_unit, remainder}
end
@doc false
# TODO remove for Cldr 3.0
if Code.ensure_loaded?(Cldr) && function_exported?(Cldr, :default_backend!, 0) do
def default_backend do
Cldr.default_backend!()
end
else
def default_backend do
Cldr.default_backend()
end
end
defimpl Cldr.DisplayName do
def display_name(unit, options) do
Cldr.Unit.display_name(unit, options)
end
end
@doc false
def exclude_protocol_implementation(module) do
exclusions =
:ex_unit
|> Application.get_env(:exclude_protocol_implementations, [])
|> List.wrap()
module in exclusions
end
def to_float(%Decimal{} = value) do
Decimal.to_float(value)
|> Cldr.Math.round(@rounding)
end
def to_float(other) do
other
end
end
