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lib/absinthe/phase/document/flatten.ex
defmodule Absinthe.Phase.Document.Flatten do
@moduledoc """
Flatten inline fragment contents and named fragments (via fragment spreads)
from operation and field selections into their fields list. Resulting fields
are tagged with the source fragment type conditions.
Note that no field merging occurs in this phase and that validation should
occur before it is run (to, eg, prevent circular fragments).
"""
use Absinthe.Phase
alias Absinthe.Blueprint
@spec run(Blueprint.t, Keyword.t) :: {:ok, Blueprint.t}
def run(input, _options \\ []) do
fragments = for fragment <- input.fragments do
process(fragment, input.fragments)
end
input = %{input | fragments: fragments}
result = input
|> Blueprint.update_current(&process(&1, input.fragments))
{:ok, result}
end
defp process(%{selections: selections} = node, fragments) do
fields = Enum.flat_map(selections, &selection_to_fields(&1, fragments))
|> inherit_type_condition(node)
%{node | fields: fields}
end
@spec selection_to_fields(Blueprint.Document.selection_t, [Blueprint.Document.Fragment.Named.t]) :: [Blueprint.Document.Field.t]
defp selection_to_fields(%Blueprint.Document.Field{} = node, fragments) do
if include?(node) do
[
process(node, fragments)
]
else
[]
end
end
defp selection_to_fields(%Blueprint.Document.Fragment.Inline{} = node, fragments) do
if include?(node) do
case node.fields do
[] ->
node.selections
|> Enum.map(&selection_to_fields(&1, fragments))
|> List.flatten
|> inherit_type_condition(node)
|> Enum.map(&process(&1, fragments))
_ ->
node.fields
end
else
[]
end
end
defp selection_to_fields(%Blueprint.Document.Fragment.Named{} = node, fragments) do
if include?(node) do
case node.fields do
[] ->
node.selections
|> Enum.map(&selection_to_fields(&1, fragments))
|> List.flatten
|> inherit_type_condition(node)
|> Enum.map(&process(&1, fragments))
_ ->
node.fields
end
else
[]
end
end
defp selection_to_fields(%Blueprint.Document.Fragment.Spread{} = node, fragments) do
if include?(node) do
named = fragments |> Enum.find(&(&1.name == node.name))
selection_to_fields(named, fragments)
else
[]
end
end
@spec inherit_type_condition([Blueprint.Document.Field.t], Blueprint.Document.t) :: [Blueprint.Document.t]
defp inherit_type_condition(fields, %{type_condition: nil}) do
fields
end
defp inherit_type_condition(fields, %{type_condition: condition}) do
fields
|> Enum.map(fn field ->
update_in(field.type_conditions, &MapSet.to_list(MapSet.new([condition | &1])))
end)
end
defp inherit_type_condition(fields, _) do
fields
end
defp include?(%{flags: %{invalid: _}}), do: false
defp include?(%{flags: %{skip: _}}), do: false
defp include?(_), do: true
end