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code.exs

defmodule Example do

  def parse(elements, acc \\ [])
  def parse([], acc), do: Enum.reverse(acc)

  def parse([{"table", attrs, nested} | rest], acc) do
    parse(rest, [{"v-table", attrs, parse(nested)} | acc])
  end

  def parse([{"thead", _attrs, nested} | rest], acc) do
    parse(rest, [parse(nested) | acc])
  end
  
  def parse([{"tbody", _attrs, nested} | rest], acc) do
    parse(rest, [parse(nested) | acc])
  end

  def parse([{"tr", _attrs, nested} | rest], acc) do
    parse(rest, [parse(nested) | acc])
  end

  def parse([{"th", _attrs, [content]} | rest], acc) do
    parse(rest, [content | acc])
  end

  def parse([{"td", _attrs, [content]} | rest], acc) do
    parse(rest, [content | acc])
  end
  
  def test do
  
decodedHTML =   [{"table", [{"class", "table table-striped"}],
   [
     {"thead", [],
      [
        {"tr", [],
         [
           {"th", [{"scope", "col"}], ["#"]},
           {"th", [{"scope", "col"}], ["First"]},
           {"th", [{"scope", "col"}], ["Last"]},
           {"th", [{"scope", "col"}], ["Handle"]}
         ]}
      ]},
     {"tbody", [],
      [
        {"tr", [],
         [
           {"th", [{"scope", "row"}], ["1"]},
           {"td", [], ["Mark"]},
           {"td", [], ["Otto"]},
           {"td", [], ["@mdo"]}
         ]},
        {"tr", [],
         [
           {"th", [{"scope", "row"}], ["2"]},
           {"td", [], ["Jacob"]},
           {"td", [], ["Thornton"]},
           {"td", [], ["@fat"]}
         ]},
        {"tr", [],
         [
           {"th", [{"scope", "row"}], ["3"]},
           {"td", [], ["Larry"]},
           {"td", [], ["the Bird"]},
           {"td", [], ["@twitter"]}
         ]}
      ]}
   ]}]
   IO.inspect parse(decodedHTML)
  end
  
  end
  
  Example.test