Break argument into its constituent class or module names, an optional method type, and a method name
arg
may be
A class or module name (optionally qualified with other class or module names (Kernel, File::Stat etc)
A method name
A method name qualified by a optionally fully qualified class or module name
We're fairly casual about delimiters: folks can say Kernel::puts, Kernel.puts, or Kernel#puts for example. There's one exception: if you say IO::read, we look for a class method, but if you say IO.read, we look for an instance method
# File rdoc/ri/util.rb, line 31 def initialize(arg) @class_names = [] separator = nil tokens = arg.split(/(\.|::|#)/) # Skip leading '::', '#' or '.', but remember it might # be a method name qualifier separator = tokens.shift if tokens[0] =~ /^(\.|::|#)/ # Skip leading '::', but remember we potentially have an inst # leading stuff must be class names while tokens[0] =~ /^[A-Z]/ @class_names << tokens.shift unless tokens.empty? separator = tokens.shift break unless separator == "::" end end # Now must have a single token, the method name, or an empty array unless tokens.empty? @method_name = tokens.shift # We may now have a trailing !, ?, or = to roll into # the method name if !tokens.empty? && tokens[0] =~ /^[!?=]$/ @method_name << tokens.shift end if @method_name =~ /::|\.|#/ or !tokens.empty? raise RDoc::RI::Error.new("Bad argument: #{arg}") end if separator && separator != '.' @is_class_method = separator == "::" end end end