class ExecJS::ExternalRuntime

def shell_escape(*args)
  # see http://technet.microsoft.com/en-us/library/cc723564.aspx#XSLTsection123121120120
  args.map { |arg|
    arg = %Q("#{arg.gsub('"','""')}") if arg.match(/[&|()<>^ "]/)
    arg
  }.join(" ")
end