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require 'yaml'
require 'rdoc/markup/simple_markup/fragments'

# Descriptions are created by RDoc (in ri_generator) and
# written out in serialized form into the documentation
# tree. ri then reads these to generate the documentation

module RI
  class NamedThing
    attr_reader :name
    def initialize(name)
      @name = name
    end
    def <=>(other)
      @name <=> other.name
    end

    def hash
      @name.hash
    end

    def eql?(other)
      @name.eql?(other)
    end
  end

#  Alias          = Struct.new(:old_name, :new_name)

  class AliasName < NamedThing
  end

  class Attribute < NamedThing
    attr_reader :rw, :comment
    def initialize(name, rw, comment)
      super(name)
      @rw = rw
      @comment = comment
    end
  end

  class Constant < NamedThing
    attr_reader :value, :comment
    def initialize(name, value, comment)
      super(name)
      @value = value
      @comment = comment
    end
  end

  class IncludedModule < NamedThing
  end


  class MethodSummary < NamedThing
    def initialize(name="")
      super
    end
  end



  class Description
    attr_accessor :name
    attr_accessor :full_name
    attr_accessor :comment

    def serialize
      self.to_yaml
    end

    def Description.deserialize(from)
      YAML.load(from)
    end

    def <=>(other)
      @name <=> other.name
    end
  end
  
  class ModuleDescription < Description
    
    attr_accessor :class_methods
    attr_accessor :instance_methods
    attr_accessor :attributes
    attr_accessor :constants
    attr_accessor :includes

    # merge in another class desscription into this one
    def merge_in(old)
      merge(@class_methods, old.class_methods)
      merge(@instance_methods, old.instance_methods)
      merge(@attributes, old.attributes)
      merge(@constants, old.constants)
      merge(@includes, old.includes)
      if @comment.nil? || @comment.empty?
        @comment = old.comment
      else
        unless old.comment.nil? or old.comment.empty? then
          @comment << SM::Flow::RULE.new
          @comment.concat old.comment
        end
      end
    end

    def display_name
      "Module"
    end

    # the 'ClassDescription' subclass overrides this
    # to format up the name of a parent
    def superclass_string
      nil
    end

    private

    def merge(into, from)
      names = {}
      into.each {|i| names[i.name] = i }
      from.each {|i| names[i.name] = i }
      into.replace(names.keys.sort.map {|n| names[n]})
    end
  end
  
  class ClassDescription < ModuleDescription
    attr_accessor :superclass

    def display_name
      "Class"
    end

    def superclass_string
      if @superclass && @superclass != "Object"
        @superclass
      else
        nil
      end
    end
  end


  class MethodDescription < Description
    
    attr_accessor :is_class_method
    attr_accessor :visibility
    attr_accessor :block_params
    attr_accessor :is_singleton
    attr_accessor :aliases
    attr_accessor :is_alias_for
    attr_accessor :params

  end
  
end