1 files changed, 120 insertions, 0 deletions
diff --git a/ruby_2_2/lib/rdoc/markup/to_tt_only.rb b/ruby_2_2/lib/rdoc/markup/to_tt_only.rb
new file mode 100644
index 0000000000..e2da20c6f3
--- /dev/null
+++ b/ruby_2_2/lib/rdoc/markup/to_tt_only.rb
@@ -0,0 +1,120 @@
+##
+# Extracts sections of text enclosed in plus, tt or code.  Used to discover
+# undocumented parameters.
+
+class RDoc::Markup::ToTtOnly < RDoc::Markup::Formatter
+
+  ##
+  # Stack of list types
+
+  attr_reader :list_type
+
+  ##
+  # Output accumulator
+
+  attr_reader :res
+
+  ##
+  # Creates a new tt-only formatter.
+
+  def initialize markup = nil
+    super nil, markup
+
+    add_tag :TT, nil, nil
+  end
+
+  ##
+  # Adds tts from +block_quote+ to the output
+
+  def accept_block_quote block_quote
+    tt_sections block_quote.text
+  end
+
+  ##
+  # Pops the list type for +list+ from #list_type
+
+  def accept_list_end list
+    @list_type.pop
+  end
+
+  ##
+  # Pushes the list type for +list+ onto #list_type
+
+  def accept_list_start list
+    @list_type << list.type
+  end
+
+  ##
+  # Prepares the visitor for consuming +list_item+
+
+  def accept_list_item_start list_item
+    case @list_type.last
+    when :NOTE, :LABEL then
+      Array(list_item.label).map do |label|
+        tt_sections label
+      end.flatten
+    end
+  end
+
+  ##
+  # Adds +paragraph+ to the output
+
+  def accept_paragraph paragraph
+    tt_sections(paragraph.text)
+  end
+
+  ##
+  # Does nothing to +markup_item+ because it doesn't have any user-built
+  # content
+
+  def do_nothing markup_item
+  end
+
+  alias accept_blank_line    do_nothing # :nodoc:
+  alias accept_heading       do_nothing # :nodoc:
+  alias accept_list_item_end do_nothing # :nodoc:
+  alias accept_raw           do_nothing # :nodoc:
+  alias accept_rule          do_nothing # :nodoc:
+  alias accept_verbatim      do_nothing # :nodoc:
+
+  ##
+  # Extracts tt sections from +text+
+
+  def tt_sections text
+    flow = @am.flow text.dup
+
+    flow.each do |item|
+      case item
+      when String then
+        @res << item if in_tt?
+      when RDoc::Markup::AttrChanger then
+        off_tags res, item
+        on_tags res, item
+      when RDoc::Markup::Special then
+        @res << convert_special(item) if in_tt? # TODO can this happen?
+      else
+        raise "Unknown flow element: #{item.inspect}"
+      end
+    end
+
+    res
+  end
+
+  ##
+  # Returns an Array of items that were wrapped in plus, tt or code.
+
+  def end_accepting
+    @res.compact
+  end
+
+  ##
+  # Prepares the visitor for gathering tt sections
+
+  def start_accepting
+    @res = []
+
+    @list_type = []
+  end
+
+end
+