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meeseeks

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Meeseeks is a library for parsing and extracting data from HTML and XML with CSS or XPath selectors.

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meeseeks lib meeseeks selector xpath expr.ex
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lib/meeseeks/selector/xpath/expr.ex 

defmodule Meeseeks.Selector.XPath.Expr do

  @moduledoc false



  alias Meeseeks.{Context, Document}

  alias Meeseeks.Selector.XPath



  @type t :: struct



  @doc """

  Invoked in order to evaluate the expression struct.

  """

  @callback eval(

              expr :: t,

              node :: Document.node_t(),

              document :: Document.t(),

              context :: Context.t()

            ) :: any



  # eval



  @doc """

  Evaluates the expression struct.

  """

  @spec eval(t, Document.node_t(), Document.t(), Context.t()) :: any

  def eval(%{__struct__: struct} = expr, node, document, context) do

    struct.eval(expr, node, document, context)

  end



  # __using__



  @doc false

  defmacro __using__(_) do

    quote do

      @behaviour XPath.Expr



      @impl XPath.Expr

      def eval(_, _, _, _), do: raise("eval/4 not implemented")



      defoverridable eval: 4

    end

  end

end