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Map, Calendar, Digits, Decimal, HTTP, Macro, Math, and String helpers for ex_cldr.
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lib/cldr/utils/string.ex
defmodule Cldr.String do
@moduledoc """
Functions that operate on a `String.t` that are not provided
in the standard lib.
"""
@doc """
This is the code of Macro.underscore with modifications:
The change is to cater for strings in the format:
This_That
which in Macro.underscore get formatted as
this__that (note the double underscore)
when we actually want
that_that
"""
def underscore(atom) when is_atom(atom) do
"Elixir." <> rest = Atom.to_string(atom)
underscore(rest)
end
def underscore(<<h, t::binary>>) do
<<to_lower_char(h)>> <> do_underscore(t, h)
end
def underscore("") do
""
end
# h is upper case, next char is not uppercase, or a _ or . => and prev != _
defp do_underscore(<<h, t, rest::binary>>, prev)
when h >= ?A and h <= ?Z and not (t >= ?A and t <= ?Z) and t != ?. and t != ?_ and
prev != ?_ do
<<?_, to_lower_char(h), t>> <> do_underscore(rest, t)
end
# h is uppercase, previous was not uppercase or _
defp do_underscore(<<h, t::binary>>, prev)
when h >= ?A and h <= ?Z and not (prev >= ?A and prev <= ?Z) and prev != ?_ do
<<?_, to_lower_char(h)>> <> do_underscore(t, h)
end
# h is .
defp do_underscore(<<?., t::binary>>, _) do
<<?/>> <> underscore(t)
end
# Any other char
defp do_underscore(<<h, t::binary>>, _) do
<<to_lower_char(h)>> <> do_underscore(t, h)
end
defp do_underscore(<<>>, _) do
<<>>
end
def to_upper_char(char) when char >= ?a and char <= ?z, do: char - 32
def to_upper_char(char), do: char
def to_lower_char(char) when char >= ?A and char <= ?Z, do: char + 32
def to_lower_char(char), do: char
end