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solid lib solid literal.ex
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lib/solid/literal.ex 

defmodule Solid.Literal do

  alias Solid.Lexer

  alias Solid.Parser.Loc



  defmodule Empty do

    defstruct []

  end



  @enforce_keys [:loc, :value]

  defstruct [:loc, :value]



  @type value :: boolean | nil | binary | integer | float | %Empty{}

  @type t :: %__MODULE__{loc: Loc.t(), value: value}



  defimpl String.Chars do

    def to_string(literal), do: inspect(literal.value)

  end



  @spec parse(Lexer.tokens()) :: {:ok, t, Lexer.tokens()} | {:error, binary, Lexer.loc()}

  def parse(tokens) do

    case tokens do

      [{type, meta, value} | rest] when type in [:float, :integer] ->

        {:ok, %__MODULE__{loc: struct!(Loc, meta), value: value}, rest}



      [{:string, meta, value, _quotes} | rest] ->

        {:ok, %__MODULE__{loc: struct!(Loc, meta), value: value}, rest}



      _ ->

        {:error, "Literal expected", Solid.Parser.meta_head(tokens)}

    end

  end

end