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context.rb

require 'rdoc/code_object'

##
# A Context is something that can hold modules, classes, methods, attributes,
# aliases, requires, and includes. Classes, modules, and files are all
# Contexts.

class RDoc::Context < RDoc::CodeObject

include Comparable

##
  # Types of methods

TYPES = %w[class instance]

##
  # Class/module aliases

attr_reader :aliases

##
  # All attr* methods

attr_reader :attributes

##
  # Constants defined

attr_reader :constants

##
  # Sets the current documentation section of documentation

attr_writer :current_section

##
  # Files this context is found in

attr_reader :in_files

##
  # Modules this context includes

attr_reader :includes

##
  # Methods defined in this context

attr_reader :method_list

##
  # Name of this class excluding namespace.  See also full_name

attr_reader :name

##
  # Files this context requires

attr_reader :requires

##
  # Use this section for the next method, attribute or constant added.

attr_accessor :temporary_section

##
  # Hash <tt>old_name => [aliases]</tt>, for aliases
  # that haven't (yet) been resolved to a method/attribute.
  # (Not to be confused with the aliases of the context.)

attr_accessor :unmatched_alias_lists

##
  # Aliases that could not eventually be resolved.

attr_reader :external_aliases

##
  # Current visibility of this context

attr_accessor :visibility

##
  # Hash of registered methods. Attributes are also registered here,
  # twice if they are RW.

attr_reader :methods_hash

##
  # Hash of registered constants.

attr_reader :constants_hash

##
  # A section of documentation like:
  #
  #   # :section: The title
  #   # The body
  #
  # Sections can be referenced multiple times and will be collapsed into a
  # single section.

class Section

include RDoc::Text

##
    # Section comment

attr_reader :comment

##
    # Context this Section lives in

attr_reader :parent

##
    # Section title

attr_reader :title

@@sequence = "SEC00000"

##
    # Creates a new section with +title+ and +comment+

def initialize parent, title, comment
      @parent = parent
      @title = title ? title.strip : title

@@sequence.succ!
      @sequence = @@sequence.dup

@comment = extract_comment comment
    end

##
    # Sections are equal when they have the same #title

def == other
      self.class === other and @title == other.title
    end

##
    # Anchor reference for linking to this section

def aref
      title = @title || '[untitled]'

CGI.escape(title).gsub('%', '-').sub(/^-/, '')
    end

##
    # Appends +comment+ to the current comment separated by a rule.

def comment= comment
      comment = extract_comment comment

return if comment.empty?

if @comment then
        @comment += "\n# ---\n#{comment}"
      else
        @comment = comment
      end
    end

##
    # Extracts the comment for this section from the original comment block.
    # If the first line contains :section:, strip it and use the rest.
    # Otherwise remove lines up to the line containing :section:, and look
    # for those lines again at the end and remove them. This lets us write
    #
    #   # :section: The title
    #   # The body

def extract_comment comment
      if comment =~ /^#[ \t]*:section:.*\n/ then
        start = $`
        rest = $'

if start.empty? then
          rest
        else
          rest.sub(/#{start.chomp}\Z/, '')
        end
      else
        comment
      end
    end

def inspect # :nodoc:
      "#<%s:0x%x %p>" % [self.class, object_id, title]
    end

##
    # Section sequence number (deprecated)

def sequence
      warn "RDoc::Context::Section#sequence is deprecated, use #aref"
      @sequence
    end

end

##
  # Creates an unnamed empty context with public current visibility

def initialize
    super

@in_files = []

@name    ||= "unknown"
    @parent  = nil
    @visibility = :public

@current_section = Section.new self, nil, nil
    @sections = { nil => @current_section }
    @temporary_section = nil

@classes = {}
    @modules = {}

initialize_methods_etc
  end

##
  # Sets the defaults for methods and so-forth

def initialize_methods_etc
    @method_list = []
    @attributes  = []
    @aliases     = []
    @requires    = []
    @includes    = []
    @constants   = []
    @external_aliases = []

# This Hash maps a method name to a list of unmatched aliases (aliases of
    # a method not yet encountered).
    @unmatched_alias_lists = {}

@methods_hash = {}
    @constants_hash = {}
  end

##
  # Contexts are sorted by full_name

def <=>(other)
    full_name <=> other.full_name
  end

##
  # Adds +an_alias+ that is automatically resolved

def add_alias an_alias
    return an_alias unless @document_self

method_attr = find_method(an_alias.old_name, an_alias.singleton) ||
                  find_attribute(an_alias.old_name, an_alias.singleton)

if method_attr then
      method_attr.add_alias an_alias, self
    else
      add_to @external_aliases, an_alias
      unmatched_alias_list =
        @unmatched_alias_lists[an_alias.pretty_old_name] ||= []
      unmatched_alias_list.push an_alias
    end

an_alias
  end

##
  # Adds +attribute+ if not already there. If it is (as method(s) or attribute),
  # updates the comment if it was empty.
  #
  # The attribute is registered only if it defines a new method.
  # For instance, <tt>attr_reader :foo</tt> will not be registered
  # if method +foo+ exists, but <tt>attr_accessor :foo</tt> will be registered
  # if method +foo+ exists, but <tt>foo=</tt> does not.

def add_attribute attribute
    return attribute unless @document_self

# mainly to check for redefinition of an attribute as a method
    # TODO find a policy for 'attr_reader :foo' + 'def foo=()'
    register = false

key = nil

if attribute.rw.index 'R' then
      key = attribute.pretty_name
      known = @methods_hash[key]

if known then
        known.comment = attribute.comment if known.comment.empty?
      elsif registered = @methods_hash[attribute.pretty_name << '='] and
            RDoc::Attr === registered then
        registered.rw = 'RW'
      else
        @methods_hash[key] = attribute
        register = true
      end
    end

if attribute.rw.index 'W' then
      key = attribute.pretty_name << '='
      known = @methods_hash[key]

if known then
        known.comment = attribute.comment if known.comment.empty?
      elsif registered = @methods_hash[attribute.pretty_name] and
            RDoc::Attr === registered then
        registered.rw = 'RW'
      else
        @methods_hash[key] = attribute
        register = true
      end
    end

if register then
      attribute.visibility = @visibility
      add_to @attributes, attribute
      resolve_aliases attribute
    end

attribute
  end

##
  # Adds a class named +given_name+ with +superclass+.
  #
  # Both +given_name+ and +superclass+ may contain '::', and are
  # interpreted relative to the +self+ context. This allows handling correctly
  # examples like these:
  #   class RDoc::Gauntlet < Gauntlet
  #   module Mod
  #     class Object   # implies < ::Object
  #     class SubObject < Object  # this is _not_ ::Object
  #
  # Given <tt>class Container::Item</tt> RDoc assumes +Container+ is a module
  # unless it later sees <tt>class Container</tt>.  +add_class+ automatically
  # upgrades +given_name+ to a class in this case.

def add_class class_type, given_name, superclass = '::Object'
    # superclass +nil+ is passed by the C parser in the following cases:
    # - registering Object in 1.8 (correct)
    # - registering BasicObject in 1.9 (correct)
    # - registering RubyVM in 1.9 in iseq.c (incorrect: < Object in vm.c)
    #
    # If we later find a superclass for a registered class with a nil
    # superclass, we must honor it.

# find the name & enclosing context
    if given_name =~ /^:+(\w+)$/ then
      full_name = $1
      enclosing = top_level
      name = full_name.split(/:+/).last
    else
      full_name = child_name given_name

if full_name =~ /^(.+)::(\w+)$/ then
        name = $2
        ename = $1
        enclosing = RDoc::TopLevel.classes_hash[ename] ||
                    RDoc::TopLevel.modules_hash[ename]
        # HACK: crashes in actionpack/lib/action_view/helpers/form_helper.rb (metaprogramming)
        unless enclosing then
          # try the given name at top level (will work for the above example)
          enclosing = RDoc::TopLevel.classes_hash[given_name] || RDoc::TopLevel.modules_hash[given_name]
          return enclosing if enclosing
          # not found: create the parent(s)
          names = ename.split('::')
          enclosing = self
          names.each do |n|
            enclosing = enclosing.classes_hash[n] ||
                        enclosing.modules_hash[n] ||
                        enclosing.add_module(RDoc::NormalModule, n)
          end
        end
      else
        name = full_name
        enclosing = self
      end
    end

# fix up superclass
    superclass = nil if full_name == 'BasicObject'
    superclass = nil if full_name == 'Object' and defined?(::BasicObject)
    superclass = '::BasicObject' if
      defined?(::BasicObject) and full_name == 'Object'

# find the superclass full name
    if superclass then
      if superclass =~ /^:+/ then
        superclass = $' #'
      else
        if superclass =~ /^(\w+):+(.+)$/ then
          suffix = $2
          mod = find_module_named($1)
          superclass = mod.full_name + '::' + suffix if mod
        else
          mod = find_module_named(superclass)
          superclass = mod.full_name if mod
        end
      end

# did we believe it was a module?
      mod = RDoc::TopLevel.modules_hash.delete superclass

upgrade_to_class mod, RDoc::NormalClass, mod.parent if mod

# e.g., Object < Object
      superclass = nil if superclass == full_name
    end

klass = RDoc::TopLevel.classes_hash[full_name]

if klass then
      # if TopLevel, it may not be registered in the classes:
      enclosing.classes_hash[name] = klass

# update the superclass if needed
      if superclass then
        existing = klass.superclass
        existing = existing.full_name unless existing.is_a?(String) if existing
        if existing.nil? ||
           (existing == 'Object' && superclass != 'Object') then
          klass.superclass = superclass
        end
      end
    else
      # this is a new class
      mod = RDoc::TopLevel.modules_hash.delete full_name

if mod then
        klass = upgrade_to_class mod, RDoc::NormalClass, enclosing

klass.superclass = superclass unless superclass.nil?
      else
        klass = class_type.new name, superclass

enclosing.add_class_or_module(klass, enclosing.classes_hash,
                                      RDoc::TopLevel.classes_hash)
      end
    end

klass
  end

##
  # Adds the class or module +mod+ to the modules or
  # classes Hash +self_hash+, and to +all_hash+ (either
  # <tt>TopLevel::modules_hash</tt> or <tt>TopLevel::classes_hash</tt>),
  # unless #done_documenting is +true+. Sets the #parent of +mod+
  # to +self+, and its #section to #current_section. Returns +mod+.

def add_class_or_module mod, self_hash, all_hash
    mod.section = current_section # TODO declaring context? something is
                                  # wrong here...
    mod.parent = self

unless @done_documenting then
      self_hash[mod.name] = mod
      # this must be done AFTER adding mod to its parent, so that the full
      # name is correct:
      all_hash[mod.full_name] = mod
    end

mod
  end

##
  # Adds +constant+ if not already there. If it is, updates the comment,
  # value and/or is_alias_for of the known constant if they were empty/nil.

def add_constant constant
    return constant unless @document_self

# HACK: avoid duplicate 'PI' & 'E' in math.c (1.8.7 source code)
    # (this is a #ifdef: should be handled by the C parser)
    known = @constants_hash[constant.name]

if known then
      known.comment = constant.comment if known.comment.empty?

known.value = constant.value if
        known.value.nil? or known.value.strip.empty?

known.is_alias_for ||= constant.is_alias_for
    else
      @constants_hash[constant.name] = constant
      add_to @constants, constant
    end

constant
  end

##
  # Adds included module +include+ which should be an RDoc::Include

def add_include include
    add_to @includes, include unless
      @includes.map { |i| i.full_name }.include? include.full_name

include
  end

##
  # Adds +method+ if not already there. If it is (as method or attribute),
  # updates the comment if it was empty.

def add_method method
    return method unless @document_self

# HACK: avoid duplicate 'new' in io.c & struct.c (1.8.7 source code)
    key = method.pretty_name
    known = @methods_hash[key]

if known then
      known.comment = method.comment if known.comment.empty?
    else
      @methods_hash[key] = method
      method.visibility = @visibility
      add_to @method_list, method
      resolve_aliases method
    end

method
  end

##
  # Adds a module named +name+.  If RDoc already knows +name+ is a class then
  # that class is returned instead.  See also #add_class.

def add_module(class_type, name)
    mod = @classes[name] || @modules[name]
    return mod if mod

full_name = child_name name
    mod = RDoc::TopLevel.modules_hash[full_name] || class_type.new(name)

add_class_or_module(mod, @modules, RDoc::TopLevel.modules_hash)
  end

##
  # Adds an alias from +from+ (a class or module) to +name+ which was defined
  # in +file+.

def add_module_alias from, name, file
    return from if @done_documenting

to_name = child_name(name)

# if we already know this name, don't register an alias:
    # see the metaprogramming in lib/active_support/basic_object.rb,
    # where we already know BasicObject as a class when we find
    # BasicObject = BlankSlate
    return from if RDoc::TopLevel.find_class_or_module(to_name)

if from.module? then
      RDoc::TopLevel.modules_hash[to_name] = from
      @modules[name] = from
    else
      RDoc::TopLevel.classes_hash[to_name] = from
      @classes[name] = from
    end

# HACK: register a constant for this alias:
    # constant value and comment will be updated after,
    # when the Ruby parser adds the constant
    const = RDoc::Constant.new name, nil, ''
    const.record_location file
    const.is_alias_for = from
    add_constant const

from
  end

##
  # Adds +require+ to this context's top level

def add_require(require)
    return require unless @document_self

if RDoc::TopLevel === self then
      add_to @requires, require
    else
      parent.add_require require
    end
  end

##
  # Returns a section with +title+, creating it if it doesn't already exist.
  # +comment+ will be appended to the section's comment.
  #
  # A section with a +title+ of +nil+ will return the default section.
  #
  # See also RDoc::Context::Section

def add_section title, comment
    if section = @sections[title] then
      section.comment = comment
    else
      section = Section.new self, title, comment
      @sections[title] = section
    end

section
  end

##
  # Adds +thing+ to the collection +array+

def add_to(array, thing)
    array << thing if @document_self
    thing.parent = self
    thing.section = current_section
  end

##
  # Is there any content?
  #
  # This means any of: comment, aliases, methods, attributes, external
  # aliases, require, constant.
  #
  # Includes are also checked unless <tt>includes == false</tt>.

def any_content(includes = true)
    @any_content ||= !(
      @comment.empty? &&
      @method_list.empty? &&
      @attributes.empty? &&
      @aliases.empty? &&
      @external_aliases.empty? &&
      @requires.empty? &&
      @constants.empty?
    )
    @any_content || (includes && !@includes.empty?)
  end

##
  # Creates the full name for a child with +name+

def child_name name
    if name =~ /^:+/
      $'  #'
    elsif RDoc::TopLevel === self then
      name
    else
      "#{self.full_name}::#{name}"
    end
  end

##
  # Class attributes

def class_attributes
    @class_attributes ||= attributes.select { |a| a.singleton }
  end

##
  # Class methods

def class_method_list
    @class_method_list ||= method_list.select { |a| a.singleton }
  end

##
  # Array of classes in this context

def classes
    @classes.values
  end

##
  # All classes and modules in this namespace

def classes_and_modules
    classes + modules
  end

##
  # Hash of classes keyed by class name

def classes_hash
    @classes
  end

##
  # The current documentation section that new items will be added to.  If
  # temporary_section is available it will be used.

def current_section
    if section = @temporary_section then
      @temporary_section = nil
    else
      section = @current_section
    end

section
  end

##
  # Is part of this thing was defined in +file+?

def defined_in?(file)
    @in_files.include?(file)
  end

def display(method_attr) # :nodoc:
    if method_attr.is_a? RDoc::Attr
      "#{method_attr.definition} #{method_attr.pretty_name}"
    else
      "method #{method_attr.pretty_name}"
    end
  end

##
  # Iterator for ancestors for duck-typing.  Does nothing.  See
  # RDoc::ClassModule#each_ancestor.

def each_ancestor # :nodoc:
  end

##
  # Iterator for attributes

def each_attribute # :yields: attribute
    @attributes.each { |a| yield a }
  end

##
  # Iterator for classes and modules

def each_classmodule(&block) # :yields: module
    classes_and_modules.sort.each(&block)
  end

##
  # Iterator for constants

def each_constant # :yields: constant
    @constants.each {|c| yield c}
  end

##
  # Iterator for included modules

def each_include # :yields: include
    @includes.each do |i| yield i end
  end

##
  # Iterator for methods

def each_method # :yields: method
    @method_list.sort.each {|m| yield m}
  end

##
  # Iterator for each section's contents sorted by title.  The +section+, the
  # section's +constants+ and the sections +attributes+ are yielded.  The
  # +constants+ and +attributes+ collections are sorted.
  #
  # To retrieve methods in a section use #methods_by_type with the optional
  # +section+ parameter.
  #
  # NOTE: Do not edit collections yielded by this method

def each_section # :yields: section, constants, attributes
    constants  = @constants.group_by  do |constant|  constant.section end
    constants.default = []

attributes = @attributes.group_by do |attribute| attribute.section end
    attributes.default = []

@sections.sort_by { |title, _| title.to_s }.each do |_, section|
      yield section, constants[section].sort, attributes[section].sort
    end
  end

##
  # Finds an attribute +name+ with singleton value +singleton+.

def find_attribute(name, singleton)
    name = $1 if name =~ /^(.*)=$/
    @attributes.find { |a| a.name == name && a.singleton == singleton }
  end

##
  # Finds an attribute with +name+ in this context

def find_attribute_named(name)
    case name
    when /\A#/ then
      find_attribute name[1..-1], false
    when /\A::/ then
      find_attribute name[2..-1], true
    else
      @attributes.find { |a| a.name == name }
    end
  end

##
  # Finds a class method with +name+ in this context

def find_class_method_named(name)
    @method_list.find { |meth| meth.singleton && meth.name == name }
  end

##
  # Finds a constant with +name+ in this context

def find_constant_named(name)
    @constants.find {|m| m.name == name}
  end

##
  # Find a module at a higher scope

def find_enclosing_module_named(name)
    parent && parent.find_module_named(name)
  end

##
  # Finds an external alias +name+ with singleton value +singleton+.

def find_external_alias(name, singleton)
    @external_aliases.find { |m| m.name == name && m.singleton == singleton }
  end

##
  # Finds an external alias with +name+ in this context

def find_external_alias_named(name)
    case name
    when /\A#/ then
      find_external_alias name[1..-1], false
    when /\A::/ then
      find_external_alias name[2..-1], true
    else
      @external_aliases.find { |a| a.name == name }
    end
  end

##
  # Finds a file with +name+ in this context

def find_file_named(name)
    top_level.class.find_file_named(name)
  end

##
  # Finds an instance method with +name+ in this context

def find_instance_method_named(name)
    @method_list.find { |meth| !meth.singleton && meth.name == name }
  end

##
  # Finds a method, constant, attribute, external alias, module or file
  # named +symbol+ in this context.

def find_local_symbol(symbol)
    find_method_named(symbol) or
    find_constant_named(symbol) or
    find_attribute_named(symbol) or
    find_external_alias_named(symbol) or
    find_module_named(symbol) or
    find_file_named(symbol)
  end

##
  # Finds a method named +name+ with singleton value +singleton+.

def find_method(name, singleton)
    @method_list.find { |m| m.name == name && m.singleton == singleton }
  end

##
  # Finds a instance or module method with +name+ in this context

def find_method_named(name)
    case name
    when /\A#/ then
      find_method name[1..-1], false
    when /\A::/ then
      find_method name[2..-1], true
    else
      @method_list.find { |meth| meth.name == name }
    end
  end

##
  # Find a module with +name+ using ruby's scoping rules

def find_module_named(name)
    res = @modules[name] || @classes[name]
    return res if res
    return self if self.name == name
    find_enclosing_module_named name
  end

##
  # Look up +symbol+, first as a module, then as a local symbol.

def find_symbol(symbol)
    find_symbol_module(symbol) || find_local_symbol(symbol)
  end

##
  # Look up a module named +symbol+.

def find_symbol_module(symbol)
    result = nil

# look for a class or module 'symbol'
    case symbol
    when /^::/ then
      result = RDoc::TopLevel.find_class_or_module(symbol)
    when /^(\w+):+(.+)$/
      suffix = $2
      top = $1
      searched = self
      loop do
        mod = searched.find_module_named(top)
        break unless mod
        result = RDoc::TopLevel.find_class_or_module(mod.full_name + '::' + suffix)
        break if result || searched.is_a?(RDoc::TopLevel)
        searched = searched.parent
      end
    else
      searched = self
      loop do
        result = searched.find_module_named(symbol)
        break if result || searched.is_a?(RDoc::TopLevel)
        searched = searched.parent
      end
    end

result
  end

##
  # The full name for this context.  This method is overridden by subclasses.

def full_name
    '(unknown)'
  end

##
  # Does this context and its methods and constants all have documentation?
  #
  # (Yes, fully documented doesn't mean everything.)

def fully_documented?
    documented? and
      attributes.all? { |a| a.documented? } and
      method_list.all? { |m| m.documented? } and
      constants.all? { |c| c.documented? }
  end

##
  # URL for this with a +prefix+

def http_url(prefix)
    path = name_for_path
    path = path.gsub(/<<\s*(\w*)/, 'from-\1') if path =~ /<</
    path = [prefix] + path.split('::')

File.join(*path.compact) + '.html'
  end

##
  # Instance attributes

def instance_attributes
    @instance_attributes ||= attributes.reject { |a| a.singleton }
  end

##
  # Instance methods

def instance_method_list
    @instance_method_list ||= method_list.reject { |a| a.singleton }
  end

##
  # Breaks method_list into a nested hash by type (<tt>'class'</tt> or
  # <tt>'instance'</tt>) and visibility (+:public+, +:protected+, +:private+).
  #
  # If +section+ is provided only methods in that RDoc::Context::Section will
  # be returned.

def methods_by_type section = nil
    methods = {}

TYPES.each do |type|
      visibilities = {}
      RDoc::VISIBILITIES.each do |vis|
        visibilities[vis] = []
      end

methods[type] = visibilities
    end

each_method do |method|
      next if section and not method.section == section
      methods[method.type][method.visibility] << method
    end

methods
  end

##
  # Yields AnyMethod and Attr entries matching the list of names in +methods+.

def methods_matching(methods, singleton = false, &block)
    (@method_list + @attributes).each do |m|
      yield m if methods.include?(m.name) and m.singleton == singleton
    end

each_ancestor do |parent|
      parent.methods_matching(methods, singleton, &block)
    end
  end

##
  # Array of modules in this context

def modules
    @modules.values
  end

##
  # Hash of modules keyed by module name

def modules_hash
    @modules
  end

##
  # Name to use to generate the url.
  # <tt>#full_name</tt> by default.

def name_for_path
    full_name
  end

##
  # Changes the visibility for new methods to +visibility+

def ongoing_visibility=(visibility)
    @visibility = visibility
  end

##
  # Record +top_level+ as a file +self+ is in.

def record_location(top_level)
    @in_files << top_level unless @in_files.include?(top_level)
  end

##
  # Should we remove this context from the documentation?
  #
  # The answer is yes if:
  # * #received_nodoc is +true+
  # * #any_content is +false+ (not counting includes)
  # * All #includes are modules (not a string), and their module has
  #   <tt>#remove_from_documentation? == true</tt>
  # * All classes and modules have <tt>#remove_from_documentation? == true</tt>

def remove_from_documentation?
    @remove_from_documentation ||=
      @received_nodoc &&
      !any_content(false) &&
      @includes.all? { |i| !i.module.is_a?(String) && i.module.remove_from_documentation? } &&
      classes_and_modules.all? { |cm| cm.remove_from_documentation? }
  end

##
  # Removes methods and attributes with a visibility less than +min_visibility+.
  #--
  # TODO mark the visibility of attributes in the template (if not public?)

def remove_invisible(min_visibility)
    return if min_visibility == :private
    remove_invisible_in @method_list, min_visibility
    remove_invisible_in @attributes, min_visibility
  end

##
  # Only called when min_visibility == :public or :private

def remove_invisible_in(array, min_visibility) # :nodoc:
    if min_visibility == :public
      array.reject! { |e|
        e.visibility != :public and not e.force_documentation
      }
    else
      array.reject! { |e|
        e.visibility == :private and
          not e.force_documentation
      }
    end
  end

##
  # Tries to resolve unmatched aliases when a method
  # or attribute has just been added.

def resolve_aliases(added)
    # resolve any pending unmatched aliases
    key = added.pretty_name
    unmatched_alias_list = @unmatched_alias_lists[key]
    return unless unmatched_alias_list
    unmatched_alias_list.each do |unmatched_alias|
      added.add_alias unmatched_alias, self
      @external_aliases.delete unmatched_alias
    end
    @unmatched_alias_lists.delete key
  end

##
  # Sections in this context

def sections
    @sections.values
  end

def sections_hash # :nodoc:
    @sections
  end

##
  # Sets the current section to a section with +title+.  See also #add_section

def set_current_section title, comment
    @current_section = add_section title, comment
  end

##
  # Given an array +methods+ of method names, set the visibility of each to
  # +visibility+

def set_visibility_for(methods, visibility, singleton = false)
    methods_matching methods, singleton do |m|
      m.visibility = visibility
    end
  end

def to_s # :nodoc:
    "#{self.class.name} #{self.full_name}"
  end

##
  # Return the TopLevel that owns us
  #--
  # FIXME we can be 'owned' by several TopLevel (see #record_location &
  # #in_files)

def top_level
    return @top_level if defined? @top_level
    @top_level = self
    @top_level = @top_level.parent until RDoc::TopLevel === @top_level
    @top_level
  end

##
  # Upgrades NormalModule +mod+ in +enclosing+ to a +class_type+

def upgrade_to_class mod, class_type, enclosing
    enclosing.modules_hash.delete mod.name

klass = RDoc::ClassModule.from_module class_type, mod

# if it was there, then we keep it even if done_documenting
    RDoc::TopLevel.classes_hash[mod.full_name] = klass
    enclosing.classes_hash[mod.name]           = klass

klass
  end

end

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