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surgex lib surgex parser parsers boolean_parser.ex
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lib/surgex/parser/parsers/boolean_parser.ex

defmodule Surgex.Parser.BooleanParser do
@moduledoc false
def call(nil), do: {:ok, nil}
def call("0"), do: {:ok, false}
def call("1"), do: {:ok, true}
def call(false), do: {:ok, false}
def call(true), do: {:ok, true}
def call(_input), do: {:error, :invalid_boolean}
end