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dogma lib dogma util ast_node.ex
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lib/dogma/util/ast_node.ex 

defmodule Dogma.Util.AST do

  @moduledoc """

  Utility functions for analyzing and categorizing AST asts

  """



  sigil_chars =

    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" |> String.graphemes



  @doc """

  Returns true if the ast x is a literal



  ## Examples:



      iex> Dogma.Util.AST.literal?( "foo" )

      true



      iex> Dogma.Util.AST.literal?({:foo, [], Elixir})

      false

  """

  def literal?(x) when is_atom(x), do: true

  def literal?(x) when is_binary(x), do: true

  def literal?(x) when is_boolean(x), do: true

  def literal?(x) when is_number(x), do: true

  def literal?(x) when is_list(x), do: Enum.all?(x, &literal?/1)

  def literal?({x, y}), do: literal?(x) && literal?(y)

  def literal?({:{}, _, elements}), do: literal?(elements)

  def literal?({:%{}, _, _}), do: true



  for char <- sigil_chars do

    sigil_atom = String.to_atom("sigil_" <> char)

    def literal?({unquote(sigil_atom), _, _}), do: true

  end

  def literal?(_), do: false

end