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A declarative, extensible framework for building Elixir applications.

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ash lib ash query function function.ex
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lib/ash/query/function/function.ex

defmodule Ash.Query.Function do
@moduledoc """
A function is a predicate with an arguments list.
For more information on being a predicate, see `Ash.Filter.Predicate`. Most of the complexities
are there. A function must meet both behaviours.
"""
@callback new(list(term)) :: {:ok, term}
@type arg :: :ref | :term | {:options, Keyword.t()}
@doc """
The number and types of arguments supported.
Currently supports three values: `:ref`, `:term`, and `{:options, schema}`.
* `:ref` - a column/relationship path reference. Will be an instance of `Ash.Query.Ref`
* `:term` - any value. No type validation is currently supported except for what is listed here, so it must be done in the `c:new/1` function
* `{:options, keys}` - Only the last arg may be options, and `keys` is a list of atoms for which options are accepted
"""
@callback args() :: [arg]
def new(mod, args, ref) do
args = List.wrap(args)
configured_args = List.wrap(mod.args())
configured_arg_count = Enum.count(configured_args)
given_arg_count = Enum.count(args)
if configured_arg_count == given_arg_count do
args
|> Enum.zip(configured_args)
|> Enum.with_index()
|> Enum.reduce_while({:ok, []}, fn
{{%Ash.Query.Ref{} = ref, :ref}, _i}, {:ok, args} ->
{:cont, {:ok, [ref | args]}}
{{arg, :ref}, i}, {:ok, args} when is_atom(arg) ->
case Ash.Resource.attribute(ref.resource, arg) do
nil ->
{:halt,
{:error, "invalid reference in #{ordinal(i + 1)} argument to #{mod.name()}"}}
attribute ->
{:cont, {:ok, [%{ref | attribute: attribute} | args]}}
end
{{arg, :term}, _}, {:ok, args} ->
{:cont, {:ok, [arg | args]}}
{{arg, {:options, keys}}, i}, {:ok, args} ->
case to_keys(arg, keys) do
{:ok, opts} ->
{:cont, {:ok, [opts | args]}}
{:error, message} when is_binary(message) ->
{:halt,
{:error, "#{ordinal(i + 1)} argument to #{mod.name()} is invalid: #{message}"}}
{:error, exception} ->
{:halt,
{:error,
"#{ordinal(i + 1)} argument to #{mod.name()} is invalid: #{
Exception.message(exception)
}"}}
end
end)
|> case do
{:ok, args} ->
mod.new(Enum.reverse(args))
{:error, error} ->
{:error, error}
end
else
{:error,
"function #{mod.name()} takes #{configured_arg_count} arguments, provided #{
given_arg_count
}"}
end
end
defp to_keys(nil, _), do: {:ok, nil}
defp to_keys(opts, keys) do
if is_map(opts) || Keyword.keyword?(opts) do
string_keys = Enum.map(keys, &to_string/1)
Enum.reduce_while(opts, {:ok, []}, fn
{key, value}, {:ok, opts} when is_binary(key) ->
if key in string_keys do
{:cont, {:ok, [{String.to_existing_atom(key), value} | opts]}}
else
{:halt, {:error, "No such option #{key}"}}
end
{key, value}, {:ok, opts} when is_atom(key) ->
if key in keys do
{:cont, {:ok, [{key, value} | opts]}}
else
{:halt, {:error, "No such option #{key}"}}
end
{key, _}, _ ->
{:halt, {:error, "No such option #{key}"}}
end)
else
{:error, "Invalid options #{inspect(opts)}"}
end
end
# Copied from https://github.com/andrewhao/ordinal/blob/master/lib/ordinal.ex
@doc """
Attaches the appropiate suffix to refer to an ordinal number, e.g 1 -> "1st"
"""
def ordinal(num) do
cond do
Enum.any?([11, 12, 13], &(&1 == Integer.mod(num, 100))) ->
"#{num}th"
Integer.mod(num, 10) == 1 ->
"#{num}st"
Integer.mod(num, 10) == 2 ->
"#{num}nd"
Integer.mod(num, 10) == 3 ->
"#{num}rd"
true ->
"#{num}th"
end
end
defmacro __using__(opts) do
quote do
@behaviour Ash.Filter.Predicate
alias Ash.Query.Ref
defstruct [
:arguments,
name: unquote(opts[:name]),
embedded?: false,
__function__?: true,
__predicate__?: unquote(opts[:predicate?] || false)
]
def name, do: unquote(opts[:name])
if unquote(opts[:predicate?]) do
def match?(struct) do
evaluate(struct) not in [nil, false]
end
end
defimpl Inspect do
import Inspect.Algebra
def inspect(%{arguments: args, name: name}, opts) do
concat(
to_string(name),
container_doc("(", args, ")", opts, &to_doc(&1, &2), separator: ", ")
)
end
end
end
end
end