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solid lib solid range.ex
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lib/solid/range.ex 

defmodule Solid.Range do

  @moduledoc """

  Range representation



  (first..last)

  (1..5)

  """

  alias Solid.Parser.Loc



  alias Solid.{Argument, Lexer}



  @type t :: %__MODULE__{

          loc: Loc.t(),

          start: Argument.t(),

          finish: Argument.t()

        }



  @enforce_keys [:loc, :start, :finish]

  defstruct [:loc, :start, :finish]



  defimpl String.Chars do

    def to_string(range) do

      "(#{range.start}..#{range.finish})"

    end

  end



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

  def parse(tokens) do

    with [{:open_round, meta} | tokens] <- tokens,

         {:ok, start, tokens} <- Argument.parse(tokens),

         [{:dot, _}, {:dot, _} | tokens] <- tokens,

         {:ok, finish, tokens} <- Argument.parse(tokens),

         [{:close_round, _} | tokens] <- tokens do

      {:ok, %__MODULE__{loc: struct!(Loc, meta), start: start, finish: finish}, tokens}

    else

      _ ->

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

    end

  end

end