class Sass::Engine

def count_tabs(line)
  return nil if line.strip.empty?
  return nil unless spaces = line.index(/[^ ]/)
  if spaces % 2 == 1
      raise SyntaxError.new(<<END.strip, @line)
aces} space#{spaces == 1 ? ' was' : 's were'} used for indentation. Sass must be indented using two spaces.
  elsif line[spaces] == ?\t
    raise SyntaxError.new(<<END.strip, @line)
b character was used for indentation. Sass must be indented using two spaces.
you sure you have soft tabs enabled in your editor?
  end
  spaces / 2
end