module Sass::SCSS::RX

def self.escape_ident(str)
  return "" if str.empty?
  return "\\#{str}" if str == '-' || str == '_'
  out = ""
  value = str.dup
  out << value.slice!(0...1) if value =~ /^[-_]/
  if value[0...1] =~ NMSTART
    out << value.slice!(0...1)
  else
    out << escape_char(value.slice!(0...1))
  end
  out << value.gsub(/[^a-zA-Z0-9_-]/) {|c| escape_char c}
  return out
end