class Haml::Parser

def plain(line, escape_html = nil)
  if block_opened?
    raise SyntaxError.new(Error.message(:illegal_nesting_plain), @next_line.index)
  end
  unless Util.contains_interpolation?(line.text)
    return ParseNode.new(:plain, line.index + 1, :text => line.text)
  end
  escape_html = @options.escape_html && @options.mime_type != 'text/plain' if escape_html.nil?
  line.text = Util.unescape_interpolation(line.text)
  script(line, false).tap { |n| n.value[:escape_interpolation] = true if escape_html }
end