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Edit: /opt/alt/ruby34/share/gems/gems/rdoc-6.14.0/lib/rdoc/markup/to_tt_only.rb

# frozen_string_literal: true
##
# 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::RegexpHandling then
        @res << convert_regexp_handling(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

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