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

defmodule Meeseeks.Selector.XPath.Expr.Arithmetic do

  use Meeseeks.Selector.XPath.Expr

  @moduledoc false



  alias Meeseeks.Selector.XPath.Expr



  defstruct op: nil, e1: nil, e2: nil



  @impl true

  def eval(%Expr.Arithmetic{op: :+} = expr, node, document, context) do

    v1 =

      Expr.eval(expr.e1, node, document, context)

      |> Expr.Helpers.number(document)



    v2 =

      Expr.eval(expr.e2, node, document, context)

      |> Expr.Helpers.number(document)



    Expr.Helpers.add(v1, v2)

  end



  def eval(%Expr.Arithmetic{op: :-} = expr, node, document, context) do

    v1 =

      Expr.eval(expr.e1, node, document, context)

      |> Expr.Helpers.number(document)



    v2 =

      Expr.eval(expr.e2, node, document, context)

      |> Expr.Helpers.number(document)



    Expr.Helpers.sub(v1, v2)

  end



  def eval(%Expr.Arithmetic{op: :*} = expr, node, document, context) do

    v1 =

      Expr.eval(expr.e1, node, document, context)

      |> Expr.Helpers.number(document)



    v2 =

      Expr.eval(expr.e2, node, document, context)

      |> Expr.Helpers.number(document)



    Expr.Helpers.mult(v1, v2)

  end



  def eval(%Expr.Arithmetic{op: :div} = expr, node, document, context) do

    v1 =

      Expr.eval(expr.e1, node, document, context)

      |> Expr.Helpers.number(document)



    v2 =

      Expr.eval(expr.e2, node, document, context)

      |> Expr.Helpers.number(document)



    Expr.Helpers.divd(v1, v2)

  end



  def eval(%Expr.Arithmetic{op: :mod} = expr, node, document, context) do

    v1 =

      Expr.eval(expr.e1, node, document, context)

      |> Expr.Helpers.number(document)



    v2 =

      Expr.eval(expr.e2, node, document, context)

      |> Expr.Helpers.number(document)



    Expr.Helpers.mod(v1, v2)

  end

end