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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 element pseudo_class nth_last_child.ex
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lib/meeseeks/selector/element/pseudo_class/nth_last_child.ex 

defmodule Meeseeks.Selector.Element.PseudoClass.NthLastChild do

  @moduledoc false



  use Meeseeks.Selector



  alias Meeseeks.Document

  alias Meeseeks.Selector.Element.PseudoClass.Helpers



  defstruct args: []



  def match(_selector, %Document.Element{parent: nil}, _document, _context) do

    false

  end



  def match(selector, %Document.Element{} = element, document, _context) do

    case selector.args do

      ["even"] ->

        index = Helpers.backwards_index(element, document)

        Helpers.nth?(index, 2, 0)



      ["odd"] ->

        index = Helpers.backwards_index(element, document)

        Helpers.nth?(index, 2, 1)



      [n] when is_integer(n) ->

        index = Helpers.backwards_index(element, document)

        Helpers.nth?(index, 0, n)



      [a, b] when is_integer(a) and is_integer(b) ->

        index = Helpers.backwards_index(element, document)

        Helpers.nth?(index, a, b)



      _ -> false

    end

  end



  def match(_selector, _node, _document, _context) do

    false

  end



  def validate(selector) do

    case selector.args do

      ["even"] -> {:ok, selector}

      ["odd"] -> {:ok, selector}

      [n] when is_integer(n) -> {:ok, selector}

      [a, b] when is_integer(a) and is_integer(b) -> {:ok, selector}

      _ -> {:error, ":nth-last-child has invalid arguments"}

    end

  end

end