module Haml::Util

def unescape_interpolation(str, escape_html = nil)
  res = ''
  rest = Haml::Util.handle_interpolation str.dump do |scan|
    escapes = (scan[2].size - 1) / 2
    res << scan.matched[0...-3 - escapes]
    if escapes % 2 == 1
      res << '#{'
    else
      content = eval('"' + balance(scan, ?{, ?}, 1)[0][0...-1] + '"')
      content = "Haml::Helpers.html_escape((#{content}))" if escape_html
      res << '#{' + content + "}"# Use eval to get rid of string escapes
    end
  end
  res + rest
end