1 files changed, 120 insertions, 0 deletions
diff --git a/lib/rdoc/mixin.rb b/lib/rdoc/mixin.rb
new file mode 100644
index 0000000000..547744f870
--- /dev/null
+++ b/lib/rdoc/mixin.rb
@@ -0,0 +1,120 @@
+##
+# A Mixin adds features from a module into another context.  RDoc::Include and
+# RDoc::Extend are both mixins.
+
+class RDoc::Mixin < RDoc::CodeObject
+
+  ##
+  # Name of included module
+
+  attr_accessor :name
+
+  ##
+  # Creates a new Mixin for +name+ with +comment+
+
+  def initialize(name, comment)
+    super()
+    @name = name
+    self.comment = comment
+    @module = nil # cache for module if found
+  end
+
+  ##
+  # Mixins are sorted by name
+
+  def <=> other
+    return unless self.class === other
+
+    name <=> other.name
+  end
+
+  def == other # :nodoc:
+    self.class === other and @name == other.name
+  end
+
+  alias eql? == # :nodoc:
+
+  ##
+  # Full name based on #module
+
+  def full_name
+    m = self.module
+    RDoc::ClassModule === m ? m.full_name : @name
+  end
+
+  def hash # :nodoc:
+    [@name, self.module].hash
+  end
+
+  def inspect # :nodoc:
+    "#<%s:0x%x %s.%s %s>" % [
+      self.class,
+      object_id,
+      parent_name, self.class.name.downcase, @name,
+    ]
+  end
+
+  ##
+  # Attempts to locate the included module object.  Returns the name if not
+  # known.
+  #
+  # The scoping rules of Ruby to resolve the name of an included module are:
+  # - first look into the children of the current context;
+  # - if not found, look into the children of included modules,
+  #   in reverse inclusion order;
+  # - if still not found, go up the hierarchy of names.
+  #
+  # This method has <code>O(n!)</code> behavior when the module calling
+  # include is referencing nonexistent modules.  Avoid calling #module until
+  # after all the files are parsed.  This behavior is due to ruby's constant
+  # lookup behavior.
+  #
+  # As of the beginning of October, 2011, no gem includes nonexistent modules.
+
+  def module
+    return @module if @module
+
+    # search the current context
+    return @name unless parent
+    full_name = parent.child_name(@name)
+    @module = @store.modules_hash[full_name]
+    return @module if @module
+    return @name if @name =~ /^::/
+
+    # search the includes before this one, in reverse order
+    searched = parent.includes.take_while { |i| i != self }.reverse
+    searched.each do |i|
+      inc = i.module
+      next if String === inc
+      full_name = inc.child_name(@name)
+      @module = @store.modules_hash[full_name]
+      return @module if @module
+    end
+
+    # go up the hierarchy of names
+    up = parent.parent
+    while up
+      full_name = up.child_name(@name)
+      @module = @store.modules_hash[full_name]
+      return @module if @module
+      up = up.parent
+    end
+
+    @name
+  end
+
+  ##
+  # Sets the store for this class or module and its contained code objects.
+
+  def store= store
+    super
+
+    @file = @store.add_file @file.full_name if @file
+  end
+
+  def to_s # :nodoc:
+    "#{self.class.name.downcase} #@name in: #{parent}"
+  end
+
+end
+