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lib/absinthe/phase/document/validation/unique_fragment_names.ex
defmodule Absinthe.Phase.Document.Validation.UniqueFragmentNames do
@moduledoc false
# Validates document to ensure that all fragments have unique names.
alias Absinthe.{Blueprint, Phase}
use Absinthe.Phase
use Absinthe.Phase.Validation
@doc """
Run the validation.
"""
@spec run(Blueprint.t(), Keyword.t()) :: Phase.result_t()
def run(input, _options \\ []) do
fragments =
for fragment <- input.fragments do
process(fragment, input.fragments)
end
result = %{input | fragments: fragments}
{:ok, result}
end
@spec process(Blueprint.Document.Fragment.Named.t(), [Blueprint.Document.Fragment.Named.t()]) ::
Blueprint.Document.Fragment.Named.t()
defp process(fragment, fragments) do
if duplicate?(fragments, fragment) do
fragment
|> flag_invalid(:duplicate_name)
|> put_error(error(fragment))
else
fragment
end
end
# Whether a duplicate fragment is present
@spec duplicate?([Blueprint.Document.Fragment.Named.t()], Blueprint.Document.Fragment.Named.t()) ::
boolean
defp duplicate?(fragments, fragment) do
Enum.count(fragments, &(&1.name == fragment.name)) > 1
end
# Generate an error for a duplicate fragment.
@spec error(Blueprint.Document.Fragment.Named.t()) :: Phase.Error.t()
defp error(node) do
%Phase.Error{
phase: __MODULE__,
message: error_message(node.name),
locations: [node.source_location]
}
end
@doc """
Generate an error message for a duplicate fragment.
"""
@spec error_message(String.t()) :: String.t()
def error_message(name) do
~s(There can only be one fragment named "#{name}".)
end
end