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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 xpath expr step.ex
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lib/meeseeks/selector/xpath/expr/step.ex 

defmodule Meeseeks.Selector.XPath.Expr.Step do

  use Meeseeks.Selector.XPath.Expr

  @moduledoc false



  alias Meeseeks.{Context, Selector}

  alias Meeseeks.Selector.XPath.Expr



  defstruct combinator: nil, predicates: []



  @nodes Context.nodes_key()



  @impl true

  def eval(expr, node, document, context) do

    case Selector.Combinator.next(expr.combinator, node, document) do

      nil ->

        []



      nodes when is_list(nodes) ->

        filter_nodes_by_predicates(nodes, expr.predicates, document, context)



      node ->

        filter_nodes_by_predicates([node], expr.predicates, document, context)

    end

  end



  defp filter_nodes_by_predicates(nodes, predicates, document, context) do

    Enum.reduce(predicates, nodes, &filter_nodes_by_predicate(&2, &1, document, context))

  end



  defp filter_nodes_by_predicate(nodes, predicate, document, context) do

    context = Map.put(context, @nodes, nodes)

    Enum.filter(nodes, &Expr.eval(predicate, &1, document, context))

  end

end