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ex_json_schema

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A JSON Schema validator with full support for the draft 4 specification and zero dependencies.

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ex_json_schema lib ex_json_schema validator items.ex
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lib/ex_json_schema/validator/items.ex 

defmodule ExJsonSchema.Validator.Items do

  alias ExJsonSchema.Schema

  alias ExJsonSchema.Validator



  @spec validate(Root.t, Schema.resolved, [ExJsonSchema.data]) :: Validator.errors_with_list_paths

  def validate(root, %{"items" => schema = %{}}, items) when is_list(items) do

    items

    |> Enum.with_index

    |> Enum.flat_map(fn {item, index} ->

      Validator.validate(root, schema, item, [index])

    end)

  end



  @spec validate(Root.t, Schema.resolved, [ExJsonSchema.data]) :: Validator.errors_with_list_paths

  def validate(root, %{"items" => schemata, "additionalItems" => additional_items}, items) when is_list(items) and is_list(schemata) do

    items

    |> Enum.with_index

    |> Enum.flat_map(fn {item, index} ->

      schema = Enum.at(schemata, index, additional_items_schema(additional_items))

      validate_item(root, schema, item, index)

    end)

  end



  @spec validate(Root.t, Schema.resolved, ExJsonSchema.data) :: []

  def validate(_, _, _), do: []



  defp validate_item(_, nil, _, index) do

    [{"Schema does not allow additional items.", [index]}]

  end



  defp validate_item(root, schema, item, index) do

    Validator.validate(root, schema, item, [index])

  end



  defp additional_items_schema(schema = %{}), do: schema

  defp additional_items_schema(true), do: %{}

  defp additional_items_schema(_), do: nil

end