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

defmodule Meeseeks.Selector.Element.PseudoClass.FirstChild do

  use Meeseeks.Selector

  @moduledoc false



  alias Meeseeks.{Document, Error}

  alias Meeseeks.Selector.Element.PseudoClass.Helpers



  defstruct args: []



  @impl true

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

    false

  end



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

    first_sibling =

      Helpers.siblings(element, document)

      |> List.first()



    element.id == first_sibling

  end



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

    false

  end



  @impl true

  def validate(selector) do

    case selector.args do

      [] ->

        {:ok, selector}



      _ ->

        {:error,

         Error.new(:css_selector, :invalid, %{

           description: ":first_child expects to arguments",

           selector: selector

         })}

    end

  end

end