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defmodule Codepoints do | |
defstruct str: "" | |
def new(str) when is_list(str) do | |
new(to_string(str)) | |
end | |
def new(str) when is_binary(str) do | |
%__MODULE__{str: str} | |
end | |
defimpl Enumerable do | |
def reduce(_, {:halt, acc}, _fun) do | |
{:halted, acc} | |
end | |
def reduce(%Codepoints{str: str}, {:suspend, acc}, fun) do | |
{:suspended, acc, &reduce(str, &1, fun)} | |
end | |
def reduce(%Codepoints{str: ""}, {:cont, acc}, _fun) do | |
{:done, acc} | |
end | |
def reduce(%Codepoints{str: <<h::utf8, t::binary>>}, {:cont, acc}, fun) do | |
reduce(%Codepoints{str: t}, fun.(<<h::utf8>>, acc), fun) | |
end | |
def member?(_str, _value) do | |
{:error, __MODULE__} | |
end | |
def count(_str) do | |
{:error, __MODULE__} | |
end | |
end | |
end | |
IO.inspect "abc" |> Codepoints.new |> Enum.map(&{&1, &1}) |> Enum.into(%{}) |
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