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

defmodule Meeseeks.Selector.XPath.Expr.Path do

  @moduledoc false



  use Meeseeks.Selector.XPath.Expr



  alias Meeseeks.Document

  alias Meeseeks.Selector.XPath.Expr

  alias Meeseeks.Selector.XPath.Expr.Path



  defstruct type: nil, steps: []



  def eval(%Path{type: :abs} = expr, _node, document, context) do

    root_nodes = Document.get_nodes(document, document.roots)

    next_step(expr.steps, root_nodes, document, context)

  end



  def eval(%Path{type: :rel} = expr, node, document, context) do

    next_step(expr.steps, [node], document, context)

  end



  defp next_step(_steps, [], _document, _context) do

    []

  end



  defp next_step([step|steps], nodes, document, context) when is_list(nodes) do

    case steps do

      [] ->

        Enum.reduce(nodes, [], fn(node, nodes) ->

          nodes ++ Expr.eval(step, node, document, context)

        end)

      steps ->

        Enum.reduce(nodes, [], fn(node, nodes) ->

          v = Expr.eval(step, node, document, context)

          nodes ++ next_step(steps, v, document, context)

        end)

    end

  end



  defp next_step([step|steps], node, document, context) do

    case steps do

      [] -> Expr.eval(step, node, document, context)

      steps ->

        v = Expr.eval(step, node, document, context)

        next_step(steps, v, document, context)

    end

  end

end