module Asciidoctor::Helpers

def encode_uri_component str
  # patch necessary to adhere with RFC-3986 (and thus CGI.escape)
  # see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent#Description
  %x(
    return encodeURIComponent(str).replace(/%20|[!'()*]/g, function (m) {
      return m === '%20' ? '+' : '%' + m.charCodeAt(0).toString(16)
    })
  )
end