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zoi
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Zoi is a schema validation library for Elixir, designed to provide a simple and flexible way to define and validate data.
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lib/zoi/types/enum.ex
defmodule Zoi.Types.Enum do
@moduledoc false
use Zoi.Type.Def, fields: [:values, :enum_type]
def new(values, opts \\ []) when is_list(values) do
type = verify_type(values)
mapping =
Enum.map(values, fn
{key, value} ->
{key, value}
value ->
{value, value}
end)
apply_type(opts ++ [values: mapping, enum_type: type])
end
defp verify_type([{key, value} | _rest]) when is_atom(key) and is_binary(value) do
:atom_binary
end
defp verify_type([{key, value} | _rest]) when is_atom(key) and is_integer(value) do
:atom_integer
end
defp verify_type([value | _rest]) when is_atom(value) do
:atom
end
defp verify_type([value | _rest]) when is_binary(value) do
:binary
end
defp verify_type([value | _rest]) when is_integer(value) do
:integer
end
defp verify_type(_values) do
raise ArgumentError, "Invalid enum values"
end
defimpl Zoi.Type do
def parse(%Zoi.Types.Enum{values: values, enum_type: enum_type}, input, _opts) do
case parse_enum(input, values, enum_type) do
{:error, _reason} = error ->
error
nil ->
{:error, "invalid enum value"}
{key, _value} ->
{:ok, key}
end
end
defp parse_enum(input, values, type) do
cond do
type in [:atom_binary, :binary] and is_binary(input) ->
compare_input(values, input)
type in [:atom_integer, :integer] and is_integer(input) ->
compare_input(values, input)
type == :atom and is_atom(input) ->
compare_input(values, input)
true ->
{:error, "invalid enum value"}
end
end
defp compare_input(values, input) do
Enum.find(values, fn {_key, value} -> input == value end)
end
end
end