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Liquid Template engine

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solid lib solid.ex
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lib/solid.ex 

defmodule Solid do

  @moduledoc """

  Main module to interact with Solid



  iex> Solid.parse("{{ variable }}") |> Solid.render(%{ "variable" => "value" }) |> to_string

  "value"

  """

  alias Solid.{Argument, Filter}



  @doc """

  It generates the compiled template

  """

  @spec parse(String.t) :: any

  def parse(text) do

    :solid_parser.parse(text)

  end



  @doc """

  It renders the compiled template using a `hash` with variables

  """

  @spec render(any, Map.t) :: iolist

  def render({:text, text} = template, hash \\ %{}) do

    case text do

      [{:string, string} | tail] -> [string | render_liquid(hd(tail), hash)]

    end

  end



  def render_liquid([], _hash), do: []

  def render_liquid(liquid, hash) when is_list(liquid) do

    argument = get_in(liquid, [:liquid, :argument])

    value    = Argument.get(argument, hash)



    filters = get_in(liquid, [:liquid, :filters])

    value  = value |> apply_filters(filters, hash)



    [to_string(value) | render(liquid[:text], hash)]

  end



  defp apply_filters(input, nil, _), do: input

  defp apply_filters(input, [], _), do: input

  defp apply_filters(input, [{filter, args} | filters], hash) do

    values = for arg <- args, do: Argument.get(arg, hash)

    apply(Filter, String.to_existing_atom(filter), [input | values]) |> apply_filters(filters, hash)

  end

end