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Unit formatting (volume, area, length, ...), conversion and arithmetic functions based upon the Common Locale Data Repository (CLDR).
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lib/cldr/unit/prefix.ex
defmodule Cldr.Unit.Prefix do
@moduledoc false
@si_factors %{
"yokto" => Ratio.new(1, 1_000_000_000_000_000_000_000_000),
"zepto" => Ratio.new(1, 1_000_000_000_000_000_000_000),
"atto" => Ratio.new(1, 1_000_000_000_000_000_000),
"femto" => Ratio.new(1, 1_000_000_000_000_000),
"pico" => Ratio.new(1, 1_000_000_000_000),
"nano" => Ratio.new(1, 1_000_000_000),
"micro" => Ratio.new(1, 1_000_000),
"milli" => Ratio.new(1, 1_000),
"centi" => Ratio.new(1, 100),
"deci" => Ratio.new(1, 10),
"deka" => 10,
"hecto" => 100,
"kilo" => 1_000,
"mega" => 1_000_000,
"giga" => 1_000_000_000,
"tera" => 1_000_000_000_000,
"peta" => 1_000_000_000_000_000,
"exa" => 1_000_000_000_000_000_000,
"zetta" => 1_000_000_000_000_000_000_000,
"yotta" => 1_000_000_000_000_000_000_000_000
}
def si_factors do
@si_factors
end
@si_power_prefixes @si_factors
|> Enum.map(fn
{prefix, factor} when is_integer(factor) ->
{prefix, trunc(:math.log10(factor))}
{prefix, %Ratio{denominator: factor}} ->
{prefix, -trunc(:math.log10(factor))}
end)
|> Map.new()
def si_power_prefixes do
@si_power_prefixes
end
@power_units [{"square", 2}, {"cubic", 3}]
def power_units do
@power_units
end
@si_sort_order @si_factors
|> Enum.map(fn
{k, v} when is_integer(v) -> {k, v / 1.0}
{k, v} -> {k, Ratio.to_float(v)}
end)
|> Enum.sort(fn {_k1, v1}, {_k2, v2} -> v1 > v2 end)
|> Enum.map(&elem(&1, 0))
|> Enum.with_index()
def si_sort_order do
@si_sort_order
end
@prefixes Map.keys(@si_factors) ++ Enum.map(@power_units, fn {factor, _} -> factor <> "_" end)
def prefixes do
@prefixes
end
@si_keys @si_power_prefixes
|> Enum.map(fn {_name, exp} ->
String.replace("10p#{exp}", "-", "_") |> String.to_atom()
end)
def si_keys do
@si_keys
end
@power_keys @power_units
|> Enum.map(fn {_name, exp} ->
String.to_atom("power#{exp}")
end)
def power_keys do
@power_keys
end
end