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name : 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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