#!/usr/bin/env ruby

require 'rexml/document'

doc = REXML::Document.new(ARGF.read, ignore_whitespace_nodes: :all)
xpath = '//dict/key[text()="variablesdontexport"]/following-sibling::array'
vars = doc.elements[xpath].map(&:text)

vars.each do |var|
  doc.elements["//key[text()='#{var}']/following-sibling::string"].text = ''
end

doc.write