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All Things Elixir @ Surge Ventures Inc, the creators of Fresha
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lib/surgex/parser/parsers/integer_parser.ex
defmodule Surgex.Parser.IntegerParser do
@moduledoc false
@type errors :: :invalid_integer | :out_of_range
@spec call(nil, any) :: {:ok, nil}
@spec call(String.t() | integer, list) :: {:ok, integer} | {:error, errors}
def call(input, opts \\ [])
def call(nil, _opts), do: {:ok, nil}
def call("", _opts), do: {:ok, nil}
def call(input, opts) when is_integer(input) do
min = Keyword.get(opts, :min)
max = Keyword.get(opts, :max)
validate_range(input, min, max)
end
def call(input, opts) when is_binary(input) do
min = Keyword.get(opts, :min)
max = Keyword.get(opts, :max)
case Integer.parse(input) do
{int, ""} ->
validate_range(int, min, max)
_ ->
{:error, :invalid_integer}
end
end
defp validate_range(input, min, max) do
case input do
int when (is_integer(min) and int < min) or (is_integer(max) and int > max) ->
{:error, :out_of_range}
int ->
{:ok, int}
end
end
end