1 files changed, 111 insertions, 0 deletions
diff --git a/ruby_2_2/lib/rdoc/alias.rb b/ruby_2_2/lib/rdoc/alias.rb
new file mode 100644
index 0000000000..39d2694817
--- /dev/null
+++ b/ruby_2_2/lib/rdoc/alias.rb
@@ -0,0 +1,111 @@
+##
+# Represent an alias, which is an old_name/new_name pair associated with a
+# particular context
+#--
+# TODO implement Alias as a proxy to a method/attribute, inheriting from
+#      MethodAttr
+
+class RDoc::Alias < RDoc::CodeObject
+
+  ##
+  # Aliased method's name
+
+  attr_reader :new_name
+
+  alias name new_name
+
+  ##
+  # Aliasee method's name
+
+  attr_reader :old_name
+
+  ##
+  # Is this an alias declared in a singleton context?
+
+  attr_accessor :singleton
+
+  ##
+  # Source file token stream
+
+  attr_reader :text
+
+  ##
+  # Creates a new Alias with a token stream of +text+ that aliases +old_name+
+  # to +new_name+, has +comment+ and is a +singleton+ context.
+
+  def initialize(text, old_name, new_name, comment, singleton = false)
+    super()
+
+    @text = text
+    @singleton = singleton
+    @old_name = old_name
+    @new_name = new_name
+    self.comment = comment
+  end
+
+  ##
+  # Order by #singleton then #new_name
+
+  def <=>(other)
+    [@singleton ? 0 : 1, new_name] <=> [other.singleton ? 0 : 1, other.new_name]
+  end
+
+  ##
+  # HTML fragment reference for this alias
+
+  def aref
+    type = singleton ? 'c' : 'i'
+    "#alias-#{type}-#{html_name}"
+  end
+
+  ##
+  # Full old name including namespace
+
+  def full_old_name
+    @full_name || "#{parent.name}#{pretty_old_name}"
+  end
+
+  ##
+  # HTML id-friendly version of +#new_name+.
+
+  def html_name
+    CGI.escape(@new_name.gsub('-', '-2D')).gsub('%','-').sub(/^-/, '')
+  end
+
+  def inspect # :nodoc:
+    parent_name = parent ? parent.name : '(unknown)'
+    "#<%s:0x%x %s.alias_method %s, %s>" % [
+      self.class, object_id,
+      parent_name, @old_name, @new_name,
+    ]
+  end
+
+  ##
+  # '::' for the alias of a singleton method/attribute, '#' for instance-level.
+
+  def name_prefix
+    singleton ? '::' : '#'
+  end
+
+  ##
+  # Old name with prefix '::' or '#'.
+
+  def pretty_old_name
+    "#{singleton ? '::' : '#'}#{@old_name}"
+  end
+
+  ##
+  # New name with prefix '::' or '#'.
+
+  def pretty_new_name
+    "#{singleton ? '::' : '#'}#{@new_name}"
+  end
+
+  alias pretty_name pretty_new_name
+
+  def to_s # :nodoc:
+    "alias: #{self.new_name} -> #{self.pretty_old_name} in: #{parent}"
+  end
+
+end
+