require 'rdoc'
require 'rdoc/text'

##
# Base class for the RDoc code tree.
#
# We contain the common stuff for contexts (which are containers) and other
# elements (methods, attributes and so on)
#
# Here's the tree of the CodeObject subclasses:
#
# * RDoc::Context
#   * RDoc::TopLevel
#   * RDoc::ClassModule
#     * RDoc::AnonClass
#     * RDoc::NormalClass
#     * RDoc::NormalModule
#     * RDoc::SingleClass
# * RDoc::AnyMethod
#   * RDoc::GhostMethod
#   * RDoc::MetaMethod
# * RDoc::Alias
# * RDoc::Attr
# * RDoc::Constant
# * RDoc::Require
# * RDoc::Include

class RDoc::CodeObject

  include RDoc::Text

  ##
  # Our comment

  attr_reader :comment

  ##
  # Do we document our children?

  attr_reader :document_children

  ##
  # Do we document ourselves?

  attr_reader :document_self

  ##
  # Are we done documenting (ie, did we come across a :enddoc:)?

  attr_accessor :done_documenting

  ##
  # Force documentation of this CodeObject

  attr_accessor :force_documentation

  ##
  # Hash of arbitrary metadata for this CodeObject

  attr_reader :metadata

  ##
  # Our parent CodeObject

  attr_accessor :parent

  ##
  # Which section are we in

  attr_accessor :section

  ##
  # We are the model of the code, but we know that at some point we will be
  # worked on by viewers. By implementing the Viewable protocol, viewers can
  # associated themselves with these objects.

  attr_accessor :viewer

  ##
  # Creates a new CodeObject that will document itself and its children

  def initialize
    @metadata = {}
    @comment = ''

    @document_children   = true
    @document_self       = true
    @done_documenting    = false
    @force_documentation = false

    @parent = nil
  end

  ##
  # Replaces our comment with +comment+, unless it is empty.

  def comment=(comment)
    @comment = case comment
               when NilClass               then ''
               when RDoc::Markup::Document then comment
               else
                 if comment and not comment.empty? then
                   normalize_comment comment
                 else
                   @comment
                 end
               end
  end

  ##
  # Enables or disables documentation of this CodeObject's children.  Calls
  # remove_classes_and_modules when disabling.

  def document_children=(document_children)
    @document_children = document_children
    remove_classes_and_modules unless document_children
  end

  ##
  # Enables or disables documentation of this CodeObject.  Calls
  # remove_methods_etc when disabling.

  def document_self=(document_self)
    @document_self = document_self
    remove_methods_etc unless document_self
  end

  ##
  # Does this class have a comment with content or is document_self false.

  def documented?
    !(@document_self and @comment.empty?)
  end

  ##
  # File name of our parent

  def parent_file_name
    @parent ? @parent.base_name : '(unknown)'
  end

  ##
  # Name of our parent

  def parent_name
    @parent ? @parent.full_name : '(unknown)'
  end

  ##
  # Callback called upon disabling documentation of children.  See
  # #document_children=

  def remove_classes_and_modules
  end

  ##
  # Callback called upon disabling documentation of ourself.  See
  # #document_self=

  def remove_methods_etc
  end

  ##
  # Enable capture of documentation

  def start_doc
    @document_self = true
    @document_children = true
  end

  ##
  # Disable capture of documentation

  def stop_doc
    @document_self = false
    @document_children = false
  end

end