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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, reason)}
end
end)
end
defp error(schema, type_error) do
if error = schema.meta.error do
{:error, Zoi.Error.custom_error(issue: {error, []})}
else
{:error, type_error}
end
end
end
# There is no direct representation of a intersection in Elixir types, so we use union `|`
defimpl Zoi.TypeSpec do
def spec(%Zoi.Types.Intersection{schemas: schemas}, opts) do
Enum.map(schemas, &Zoi.type_spec(&1, opts))
|> Enum.reverse()
|> Enum.reduce("e(do: unquote(&1) | unquote(&2)))
end
end
defimpl Inspect do
import Inspect.Algebra
def inspect(type, opts) do
schemas_doc =
container_doc("[", type.schemas, "]", %Inspect.Opts{limit: 5}, fn
schema, _opts -> Inspect.inspect(schema, opts)
end)
Zoi.Inspect.build(type, opts, schemas: schemas_doc)
end
end
defimpl Zoi.JSONSchema.Encoder do
def encode(schema) do
%{allOf: Enum.map(schema.schemas, &Zoi.JSONSchema.Encoder.encode/1)}
end
end
defimpl Zoi.Describe.Encoder do
def encode(%{schemas: schemas}) do
Enum.map_join(schemas, " and ", &Zoi.Describe.Encoder.encode/1)
end
end
end