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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/intersection.ex
defmodule Zoi.Types.Intersection do
@moduledoc false
use Zoi.Type.Def, fields: [:schemas]
def new([], _opts) do
raise ArgumentError, "Intersection type must be receive a list of minimum 2 schemas"
end
def new([_one_element], _opts) do
raise ArgumentError, "Intersection type must be receive a list of minimum 2 schemas"
end
def new(schemas, opts) when is_list(schemas) do
apply_type(opts ++ [schemas: schemas])
end
def new(_schemas, _opts) do
raise ArgumentError, "Intersection type must be receive a list of minimum 2 schemas"
end
defimpl Zoi.Type do
def parse(%Zoi.Types.Intersection{schemas: schemas} = intersection, value, opts) do
Enum.reduce_while(schemas, nil, fn schema, _acc ->
ctx = Zoi.Context.new(schema, value)
opts = Keyword.put(opts, :ctx, ctx)
case Zoi.parse(schema, value, opts) do
{:ok, result} ->
{:cont, {:ok, result}}
{:error, reason} ->
{:halt, {:error, intersection.meta.error || reason}}
end
end)
end
# There is no direct representation of a intersection in Elixir types, so we use union `|`
def type_spec(%Zoi.Types.Intersection{schemas: schemas}, opts) do
Enum.map(schemas, &Zoi.Type.type_spec(&1, opts))
|> Enum.reverse()
|> Enum.reduce("e(do: unquote(&1) | unquote(&2)))
end
end
end