# File lib/rdoc/encoding.rb, line 72 def self.set_encoding string first_line = string[/\A(?:#!.*\n)?.*\n/] name = case first_line when /^<\?xml[^?]*encoding=(["'])(.*?)\1/ then $2 when /\b(?:en)?coding[=:]\s*([^\s;]+)/i then $1 else return end string.sub! first_line, '' return unless Object.const_defined? :Encoding enc = Encoding.find name string.force_encoding enc if enc end