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RDoc produces documentation for Ruby source files by parsing the source and extracting the definition for classes, modules, methods, includes and requires.  It associates these with optional documentation contained in an immediately preceding comment block then renders the result using an output formatter.
For a simple introduction to writing or generating documentation using RDoc see the README.
If you think you found a bug in RDoc see Bugs at CONTRIBUTING
If you want to use RDoc to create documentation for your Ruby source files, see RDoc::Markup and refer to rdoc --help for command line usage.
If you want to set the default markup format see Supported Formats at RDoc::Markup
If you want to store rdoc configuration in your gem (such as the default markup format) see Saved Options at RDoc::Options
If you want to write documentation for Ruby files see RDoc::Parser::Ruby
If you want to write documentation for extensions written in C see RDoc::Parser::C
If you want to generate documentation using rake see RDoc::Task.
If you want to drive RDoc programmatically, see RDoc::RDoc.
If you want to use the library to format text blocks into HTML or other formats, look at RDoc::Markup.
If you want to make an RDoc plugin such as a generator or directive handler see RDoc::RDoc.
If you want to write your own output generator see RDoc::Generator.
If you want an overview of how RDoc works see CONTRIBUTING
RDoc is currently being maintained by Eric Hodel <drbrain@segment7.net>.
Dave Thomas <dave@pragmaticprogrammer.com> is the original author of RDoc.
The Ruby parser in rdoc/parse.rb is based heavily on the outstanding work of Keiju ISHITSUKA of Nippon Rational Inc, who produced the Ruby parser for irb and the rtags package.
RDoc modifiers for attributes
RDoc modifiers for classes
RDoc modifiers for constants
Name of the dotfile that contains the description of files to be processed in the current directory
General RDoc modifiers
Ruby's built-in classes, modules and exceptions
RDoc modifiers for methods
RDoc version you are using
Method visibilities
 
               # File ruby-3.1.2/lib/rdoc.rb, line 123
def self.home
  rdoc_dir = begin
              File.expand_path('~/.rdoc')
            rescue ArgumentError
            end
  if File.directory?(rdoc_dir)
    rdoc_dir
  else
    begin
      # XDG
      xdg_data_home = ENV["XDG_DATA_HOME"] || File.join(File.expand_path("~"), '.local', 'share')
      unless File.exist?(xdg_data_home)
        FileUtils.mkdir_p xdg_data_home
      end
      File.join xdg_data_home, "rdoc"
    rescue Errno::EACCES
    end
  end
end
             
            Loads the best available YAML library.
 
               # File ruby-3.1.2/lib/rdoc.rb, line 107
def self.load_yaml
  begin
    gem 'psych'
  rescue NameError => e # --disable-gems
    raise unless e.name == :gem
  rescue Gem::LoadError
  end
  begin
    require 'psych'
  rescue ::LoadError
  ensure
    require 'yaml'
  end
end