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All Things Elixir @ Surge Ventures Inc, the creators of Fresha
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lib/surgex/parser/parsers/id_list_parser.ex
defmodule Surgex.Parser.IdListParser do
@moduledoc false
alias Surgex.Parser.IdParser
@type errors :: :invalid_identifier | :invalid_id_list_length | IdParser.errors()
@spec call(String.t() | List.t() | nil, Keyword.t()) :: {:ok, [integer]} | {:error, errors}
def call(input, opts \\ [])
def call(nil, _opts), do: {:ok, []}
def call("", _opts), do: {:ok, []}
def call(input, opts) when is_binary(input) do
input
|> String.split(",")
|> Enum.reduce({:ok, []}, &reduce_ids/2)
|> reverse()
|> check_max(Keyword.get(opts, :max))
end
def call(input, opts) when is_list(input) do
input
|> Enum.reduce({:ok, []}, &reduce_ids/2)
|> reverse()
|> check_max(Keyword.get(opts, :max))
end
defp reduce_ids(_, {:error, reason}) do
{:error, reason}
end
defp reduce_ids(id_string, {:ok, previous_ids}) when is_binary(id_string) do
case IdParser.call(id_string) do
{:ok, id} ->
{:ok, [id | previous_ids]}
{:error, reason} ->
{:error, reason}
end
end
defp reduce_ids(id, {:ok, previous_ids}) when is_integer(id) and id > 0 do
{:ok, [id | previous_ids]}
end
defp reduce_ids(id, {:ok, _previous_ids}) when is_integer(id) do
{:error, :invalid_identifier}
end
defp reverse({:ok, ids}), do: {:ok, Enum.reverse(ids)}
defp reverse(error), do: error
defp check_max({:ok, ids}, limit) when is_integer(limit) and length(ids) > limit do
{:error, :invalid_id_list_length}
end
defp check_max(ok_or_error, _limit_or_nil), do: ok_or_error
end