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Ash DataLayer for Neo4j

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ash_neo4j lib verifiers verify_label_pascal_case.ex
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lib/verifiers/verify_label_pascal_case.ex 

# SPDX-FileCopyrightText: 2025 ash_neo4j contributors <https://github.com/diffo-dev/ash_neo4j/graphs.contributors>

#

# SPDX-License-Identifier: MIT



defmodule AshNeo4j.Verifiers.VerifyLabelPascalCase do

  @moduledoc "Verifies that the label is PascalCase"

  use Spark.Dsl.Verifier



  alias Spark.Dsl.Verifier

  alias Spark.Error.DslError

  @regex ~r/^[A-Z][a-zA-Z0-9]*$/



  @impl true

  def verify(dsl) do

    resource = Verifier.get_persisted(dsl, :module)

    module = String.to_atom(List.last(Module.split(resource)))

    label = Verifier.get_option(dsl, [:neo4j], :label, module)



    cond do

      label == nil ->

        {:error,

         DslError.exception(

           module: resource,

           message: "label: missing"

         )}



      Regex.match?(@regex, Atom.to_string(label)) ->

        :ok



      true ->

        {:error,

         DslError.exception(

           module: resource,

           message: "label: neo4j label must be PascalCase"

         )}

    end

  end

end