class Reline::LineEditor

# File reline/line_editor.rb, line 56
def initialize(config, encoding)
  @config = config
  @completion_append_character = ''
  reset_variables(encoding: encoding)
end

# File reline/line_editor.rb, line 639
def add_dialog_proc(name, p, context = nil)
  dialog = Dialog.new(name, @config, DialogProcScope.new(self, @config, p, context))
  if index = @dialogs.find_index { |d| d.name == name }
    @dialogs[index] = dialog
  else
    @dialogs << dialog
  end
end

# File reline/line_editor.rb, line 1893
def byte_pointer=(val)
  @byte_pointer = val
  str = @line.byteslice(0, @byte_pointer)
  @cursor = calculate_width(str)
  @cursor_max = calculate_width(@line)
end

# File reline/line_editor.rb, line 1657
def call_completion_proc
  result = retrieve_completion_block(true)
  pre, target, post = result
  result = call_completion_proc_with_checking_args(pre, target, post)
  Reline.core.instance_variable_set(:@completion_quote_character, nil)
  result
end

# File reline/line_editor.rb, line 1665
def call_completion_proc_with_checking_args(pre, target, post)
  if @completion_proc and target
    argnum = @completion_proc.parameters.inject(0) { |result, item|
      case item.first
      when :req, :opt
        result + 1
      when :rest
        break 3
      end
    }
    case argnum
    when 1
      result = @completion_proc.(target)
    when 2
      result = @completion_proc.(target, pre)
    when 3..Float::INFINITY
      result = @completion_proc.(target, pre, post)
    end
  end
  result
end

# File reline/line_editor.rb, line 1811
def confirm_multiline_termination
  temp_buffer = @buffer_of_lines.dup
  if @previous_line_index and @line_index == (@buffer_of_lines.size - 1)
    temp_buffer[@previous_line_index] = @line
  else
    temp_buffer[@line_index] = @line
  end
  @confirm_multiline_termination_proc.(temp_buffer.join("\n") + "\n")
end

# File reline/line_editor.rb, line 1833
def delete_text(start = nil, length = nil)
  if start.nil? and length.nil?
    if @is_multiline
      if @buffer_of_lines.size == 1
        @line&.clear
        @byte_pointer = 0
        @cursor = 0
        @cursor_max = 0
      elsif @line_index == (@buffer_of_lines.size - 1) and @line_index > 0
        @buffer_of_lines.pop
        @line_index -= 1
        @line = @buffer_of_lines[@line_index]
        @byte_pointer = 0
        @cursor = 0
        @cursor_max = calculate_width(@line)
      elsif @line_index < (@buffer_of_lines.size - 1)
        @buffer_of_lines.delete_at(@line_index)
        @line = @buffer_of_lines[@line_index]
        @byte_pointer = 0
        @cursor = 0
        @cursor_max = calculate_width(@line)
      end
    else
      @line&.clear
      @byte_pointer = 0
      @cursor = 0
      @cursor_max = 0
    end
  elsif not start.nil? and not length.nil?
    if @line
      before = @line.byteslice(0, start)
      after = @line.byteslice(start + length, @line.bytesize)
      @line = before + after
      @byte_pointer = @line.bytesize if @byte_pointer > @line.bytesize
      str = @line.byteslice(0, @byte_pointer)
      @cursor = calculate_width(str)
      @cursor_max = calculate_width(@line)
    end
  elsif start.is_a?(Range)
    range = start
    first = range.first
    last = range.last
    last = @line.bytesize - 1 if last > @line.bytesize
    last += @line.bytesize if last < 0
    first += @line.bytesize if first < 0
    range = range.exclude_end? ? first...last : first..last
    @line = @line.bytes.reject.with_index{ |c, i| range.include?(i) }.map{ |c| c.chr(Encoding::ASCII_8BIT) }.join.force_encoding(@encoding)
    @byte_pointer = @line.bytesize if @byte_pointer > @line.bytesize
    str = @line.byteslice(0, @byte_pointer)
    @cursor = calculate_width(str)
    @cursor_max = calculate_width(@line)
  else
    @line = @line.byteslice(0, start)
    @byte_pointer = @line.bytesize if @byte_pointer > @line.bytesize
    str = @line.byteslice(0, @byte_pointer)
    @cursor = calculate_width(str)
    @cursor_max = calculate_width(@line)
  end
end

# File reline/line_editor.rb, line 1275
def editing_mode
  @config.editing_mode
end

# File reline/line_editor.rb, line 258
def eof?
  @eof
end

# File reline/line_editor.rb, line 250
def finalize
  Signal.trap('INT', @old_trap)
  begin
    Signal.trap('TSTP', @old_tstp_trap)
  rescue ArgumentError
  end
end

# File reline/line_editor.rb, line 1922
def finish
  @finished = true
  @rerender_all = true
  @config.reset
end

# File reline/line_editor.rb, line 1918
def finished?
  @finished
end

# File reline/line_editor.rb, line 1582
def input_key(key)
  @last_key = key
  @config.reset_oneshot_key_bindings
  @dialogs.each do |dialog|
    if key.char.instance_of?(Symbol) and key.char == dialog.name
      return
    end
  end
  @just_cursor_moving = nil
  if key.char.nil?
    if @first_char
      @line = nil
    end
    finish
    return
  end
  old_line = @line.dup
  @first_char = false
  completion_occurs = false
  if @config.editing_mode_is?(:emacs, :vi_insert) and key.char == "\C-i".ord
    unless @config.disable_completion
      result = call_completion_proc
      if result.is_a?(Array)
        completion_occurs = true
        process_insert
        if @config.autocompletion
          move_completed_list(result, :down)
        else
          complete(result)
        end
      end
    end
  elsif @config.editing_mode_is?(:emacs, :vi_insert) and key.char == :completion_journey_up
    if not @config.disable_completion and @config.autocompletion
      result = call_completion_proc
      if result.is_a?(Array)
        completion_occurs = true
        process_insert
        move_completed_list(result, :up)
      end
    end
  elsif not @config.disable_completion and @config.editing_mode_is?(:vi_insert) and ["\C-p".ord, "\C-n".ord].include?(key.char)
    unless @config.disable_completion
      result = call_completion_proc
      if result.is_a?(Array)
        completion_occurs = true
        process_insert
        move_completed_list(result, "\C-p".ord == key.char ? :up : :down)
      end
    end
  elsif Symbol === key.char and respond_to?(key.char, true)
    process_key(key.char, key.char)
  else
    normal_char(key)
  end
  unless completion_occurs
    @completion_state = CompletionState::NORMAL
    @completion_journey_data = nil
  end
  if not @in_pasting and @just_cursor_moving.nil?
    if @previous_line_index and @buffer_of_lines[@previous_line_index] == @line
      @just_cursor_moving = true
    elsif @previous_line_index.nil? and @buffer_of_lines[@line_index] == @line and old_line == @line
      @just_cursor_moving = true
    else
      @just_cursor_moving = false
    end
  else
    @just_cursor_moving = false
  end
  if @is_multiline and @auto_indent_proc and not simplified_rendering?
    process_auto_indent
  end
end

# File reline/line_editor.rb, line 1821
def insert_text(text)
  width = calculate_width(text)
  if @cursor == @cursor_max
    @line += text
  else
    @line = byteinsert(@line, @byte_pointer, text)
  end
  @byte_pointer += text.bytesize
  @cursor += width
  @cursor_max += width
end

# File reline/line_editor.rb, line 973
def just_move_cursor
  prompt, prompt_width, prompt_list = check_multiline_prompt(@buffer_of_lines)
  move_cursor_up(@started_from)
  new_first_line_started_from =
    if @line_index.zero?
      0
    else
      calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list || prompt)
    end
  first_line_diff = new_first_line_started_from - @first_line_started_from
  new_cursor, new_cursor_max, new_started_from, new_byte_pointer = calculate_nearest_cursor(@buffer_of_lines[@line_index], @cursor, @started_from, @byte_pointer, false)
  new_started_from = calculate_height_by_width(prompt_width + new_cursor) - 1
  calculate_scroll_partial_screen(@highest_in_all, new_first_line_started_from + new_started_from)
  @previous_line_index = nil
  if @rerender_all
    @line = @buffer_of_lines[@line_index]
    rerender_all_lines
    @rerender_all = false
    true
  else
    @line = @buffer_of_lines[@line_index]
    @first_line_started_from = new_first_line_started_from
    @started_from = new_started_from
    @cursor = new_cursor
    @cursor_max = new_cursor_max
    @byte_pointer = new_byte_pointer
    move_cursor_down(first_line_diff + @started_from)
    Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
    false
  end
end

# File reline/line_editor.rb, line 323
def multiline_off
  @is_multiline = false
end

# File reline/line_editor.rb, line 319
def multiline_on
  @is_multiline = true
end

# File reline/line_editor.rb, line 431
def rerender
  return if @line.nil?
  if @menu_info
    scroll_down(@highest_in_all - @first_line_started_from)
    @rerender_all = true
  end
  if @menu_info
    show_menu
    @menu_info = nil
  end
  prompt, prompt_width, prompt_list = check_multiline_prompt(whole_lines)
  if @cleared
    clear_screen_buffer(prompt, prompt_list, prompt_width)
    @cleared = false
    return
  end
  if @is_multiline and finished? and @scroll_partial_screen
    # Re-output all code higher than the screen when finished.
    Reline::IOGate.move_cursor_up(@first_line_started_from + @started_from - @scroll_partial_screen)
    Reline::IOGate.move_cursor_column(0)
    @scroll_partial_screen = nil
    prompt, prompt_width, prompt_list = check_multiline_prompt(whole_lines)
    if @previous_line_index
      new_lines = whole_lines(index: @previous_line_index, line: @line)
    else
      new_lines = whole_lines
    end
    modify_lines(new_lines).each_with_index do |line, index|
      @output.write "#{prompt_list ? prompt_list[index] : prompt}#{line}\n"
      Reline::IOGate.erase_after_cursor
    end
    @output.flush
    clear_dialog
    return
  end
  new_highest_in_this = calculate_height_by_width(prompt_width + calculate_width(@line.nil? ? '' : @line))
  rendered = false
  if @add_newline_to_end_of_buffer
    rerender_added_newline(prompt, prompt_width)
    @add_newline_to_end_of_buffer = false
  else
    if @just_cursor_moving and not @rerender_all
      rendered = just_move_cursor
      render_dialog((prompt_width + @cursor) % @screen_size.last)
      @just_cursor_moving = false
      return
    elsif @previous_line_index or new_highest_in_this != @highest_in_this
      rerender_changed_current_line
      @previous_line_index = nil
      rendered = true
    elsif @rerender_all
      rerender_all_lines
      @rerender_all = false
      rendered = true
    else
    end
  end
  if @is_multiline
    if finished?
      # Always rerender on finish because output_modifier_proc may return a different output.
      if @previous_line_index
        new_lines = whole_lines(index: @previous_line_index, line: @line)
      else
        new_lines = whole_lines
      end
      line = modify_lines(new_lines)[@line_index]
      clear_dialog
      prompt, prompt_width, prompt_list = check_multiline_prompt(new_lines)
      render_partial(prompt, prompt_width, line, @first_line_started_from)
      move_cursor_down(@highest_in_all - (@first_line_started_from + @highest_in_this - 1) - 1)
      scroll_down(1)
      Reline::IOGate.move_cursor_column(0)
      Reline::IOGate.erase_after_cursor
    else
      if not rendered and not @in_pasting
        line = modify_lines(whole_lines)[@line_index]
        prompt, prompt_width, prompt_list = check_multiline_prompt(whole_lines)
        render_partial(prompt, prompt_width, line, @first_line_started_from)
      end
      render_dialog((prompt_width + @cursor) % @screen_size.last)
    end
    @buffer_of_lines[@line_index] = @line
    @rest_height = 0 if @scroll_partial_screen
  else
    line = modify_lines(whole_lines)[@line_index]
    render_partial(prompt, prompt_width, line, 0)
    if finished?
      scroll_down(1)
      Reline::IOGate.move_cursor_column(0)
      Reline::IOGate.erase_after_cursor
    end
  end
end

# File reline/line_editor.rb, line 425
def rerender_all
  @rerender_all = true
  process_insert(force: true)
  rerender
end

# File reline/line_editor.rb, line 149
def reset(prompt = '', encoding:)
  @rest_height = (Reline::IOGate.get_screen_size.first - 1) - Reline::IOGate.cursor_pos.y
  @screen_size = Reline::IOGate.get_screen_size
  @screen_height = @screen_size.first
  reset_variables(prompt, encoding: encoding)
  Reline::IOGate.set_winch_handler do
    @resized = true
  end
  if ENV.key?('RELINE_ALT_SCROLLBAR')
    @full_block = '::'
    @upper_half_block = "''"
    @lower_half_block = '..'
    @block_elem_width = 2
  elsif Reline::IOGate.win?
    @full_block = '█'
    @upper_half_block = '▀'
    @lower_half_block = '▄'
    @block_elem_width = 1
  elsif @encoding == Encoding::UTF_8
    @full_block = '█'
    @upper_half_block = '▀'
    @lower_half_block = '▄'
    @block_elem_width = Reline::Unicode.calculate_width('█')
  else
    @full_block = '::'
    @upper_half_block = "''"
    @lower_half_block = '..'
    @block_elem_width = 2
  end
end

# File reline/line_editor.rb, line 301
def reset_line
  @cursor = 0
  @cursor_max = 0
  @byte_pointer = 0
  @buffer_of_lines = [String.new(encoding: @encoding)]
  @line_index = 0
  @previous_line_index = nil
  @line = @buffer_of_lines[0]
  @first_line_started_from = 0
  @move_up = 0
  @started_from = 0
  @highest_in_this = 1
  @highest_in_all = 1
  @line_backup_in_history = nil
  @multibyte_buffer = String.new(encoding: 'ASCII-8BIT')
  @check_new_auto_indent = false
end

# File reline/line_editor.rb, line 262
def reset_variables(prompt = '', encoding:)
  @prompt = prompt.gsub("\n", "\\n")
  @mark_pointer = nil
  @encoding = encoding
  @is_multiline = false
  @finished = false
  @cleared = false
  @rerender_all = false
  @history_pointer = nil
  @kill_ring ||= Reline::KillRing.new
  @vi_clipboard = ''
  @vi_arg = nil
  @waiting_proc = nil
  @waiting_operator_proc = nil
  @waiting_operator_vi_arg = nil
  @completion_journey_data = nil
  @completion_state = CompletionState::NORMAL
  @perfect_matched = nil
  @menu_info = nil
  @first_prompt = true
  @searching_prompt = nil
  @first_char = true
  @add_newline_to_end_of_buffer = false
  @just_cursor_moving = nil
  @cached_prompt_list = nil
  @prompt_cache_time = nil
  @eof = false
  @continuous_insertion_buffer = String.new(encoding: @encoding)
  @scroll_partial_screen = nil
  @prev_mode_string = nil
  @drop_terminate_spaces = false
  @in_pasting = false
  @auto_indent_proc = nil
  @dialogs = []
  @last_key = nil
  @resized = false
  reset_line
end

# File reline/line_editor.rb, line 180
def resize
  return unless @resized
  @resized = false
  @rest_height = (Reline::IOGate.get_screen_size.first - 1) - Reline::IOGate.cursor_pos.y
  old_screen_size = @screen_size
  @screen_size = Reline::IOGate.get_screen_size
  @screen_height = @screen_size.first
  if old_screen_size.last < @screen_size.last # columns increase
    @rerender_all = true
    rerender
  else
    back = 0
    new_buffer = whole_lines
    prompt, prompt_width, prompt_list = check_multiline_prompt(new_buffer)
    new_buffer.each_with_index do |line, index|
      prompt_width = calculate_width(prompt_list[index], true) if @prompt_proc
      width = prompt_width + calculate_width(line)
      height = calculate_height_by_width(width)
      back += height
    end
    @highest_in_all = back
    @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max)
    @first_line_started_from =
      if @line_index.zero?
        0
      else
        calculate_height_by_lines(@buffer_of_lines[0..(@line_index - 1)], prompt_list || prompt)
      end
    if @prompt_proc
      prompt = prompt_list[@line_index]
      prompt_width = calculate_width(prompt, true)
    end
    calculate_nearest_cursor
    @started_from = calculate_height_by_width(prompt_width + @cursor) - 1
    Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
    @highest_in_this = calculate_height_by_width(prompt_width + @cursor_max)
    @rerender_all = true
  end
end

# File reline/line_editor.rb, line 1729
def retrieve_completion_block(set_completion_quote_character = false)
  if Reline.completer_word_break_characters.empty?
    word_break_regexp = nil
  else
    word_break_regexp = /\A[#{Regexp.escape(Reline.completer_word_break_characters)}]/
  end
  if Reline.completer_quote_characters.empty?
    quote_characters_regexp = nil
  else
    quote_characters_regexp = /\A[#{Regexp.escape(Reline.completer_quote_characters)}]/
  end
  before = @line.byteslice(0, @byte_pointer)
  rest = nil
  break_pointer = nil
  quote = nil
  closing_quote = nil
  escaped_quote = nil
  i = 0
  while i < @byte_pointer do
    slice = @line.byteslice(i, @byte_pointer - i)
    unless slice.valid_encoding?
      i += 1
      next
    end
    if quote and slice.start_with?(closing_quote)
      quote = nil
      i += 1
      rest = nil
    elsif quote and slice.start_with?(escaped_quote)
      # skip
      i += 2
    elsif quote_characters_regexp and slice =~ quote_characters_regexp # find new "
      rest = $'
      quote = $&
      closing_quote = /(?!\\)#{Regexp.escape(quote)}/
      escaped_quote = /\\#{Regexp.escape(quote)}/
      i += 1
      break_pointer = i - 1
    elsif word_break_regexp and not quote and slice =~ word_break_regexp
      rest = $'
      i += 1
      before = @line.byteslice(i, @byte_pointer - i)
      break_pointer = i
    else
      i += 1
    end
  end
  postposing = @line.byteslice(@byte_pointer, @line.bytesize - @byte_pointer)
  if rest
    preposing = @line.byteslice(0, break_pointer)
    target = rest
    if set_completion_quote_character and quote
      Reline.core.instance_variable_set(:@completion_quote_character, quote)
      if postposing !~ /(?!\\)#{Regexp.escape(quote)}/ # closing quote
        insert_text(quote)
      end
    end
  else
    preposing = ''
    if break_pointer
      preposing = @line.byteslice(0, break_pointer)
    else
      preposing = ''
    end
    target = before
  end
  if @is_multiline
    if @previous_line_index
      lines = whole_lines(index: @previous_line_index, line: @line)
    else
      lines = whole_lines
    end
    if @line_index > 0
      preposing = lines[0..(@line_index - 1)].join("\n") + "\n" + preposing
    end
    if (lines.size - 1) > @line_index
      postposing = postposing + "\n" + lines[(@line_index + 1)..-1].join("\n")
    end
  end
  [preposing.encode(@encoding), target.encode(@encoding), postposing.encode(@encoding)]
end

# File reline/line_editor.rb, line 62
def set_pasting_state(in_pasting)
  @in_pasting = in_pasting
end

# File reline/line_editor.rb, line 220
def set_signal_handlers
  @old_trap = Signal.trap('INT') {
    clear_dialog
    if @scroll_partial_screen
      move_cursor_down(@screen_height - (@line_index - @scroll_partial_screen) - 1)
    else
      move_cursor_down(@highest_in_all - @line_index - 1)
    end
    Reline::IOGate.move_cursor_column(0)
    scroll_down(1)
    case @old_trap
    when 'DEFAULT', 'SYSTEM_DEFAULT'
      raise Interrupt
    when 'IGNORE'
      # Do nothing
    when 'EXIT'
      exit
    else
      @old_trap.call if @old_trap.respond_to?(:call)
    end
  }
  begin
    @old_tstp_trap = Signal.trap('TSTP') {
      Reline::IOGate.ungetc("\C-z".ord)
      @old_tstp_trap.call if @old_tstp_trap.respond_to?(:call)
    }
  rescue ArgumentError
  end
end

# File reline/line_editor.rb, line 66
def simplified_rendering?
  if finished?
    false
  elsif @just_cursor_moving and not @rerender_all
    true
  else
    not @rerender_all and not finished? and @in_pasting
  end
end

# File reline/line_editor.rb, line 1906
def whole_buffer
  if @buffer_of_lines.size == 1 and @line.nil?
    nil
  else
    if @previous_line_index
      whole_lines(index: @previous_line_index, line: @line).join("\n")
    else
      whole_lines.join("\n")
    end
  end
end

# File reline/line_editor.rb, line 1900
def whole_lines(index: @line_index, line: @line)
  temp_lines = @buffer_of_lines.dup
  temp_lines[index] = line
  temp_lines
end

# File reline/line_editor.rb, line 1467
def wrap_method_call(method_symbol, method_obj, key, with_operator = false)
  if @config.editing_mode_is?(:emacs, :vi_insert) and @waiting_proc.nil? and @waiting_operator_proc.nil?
    not_insertion = method_symbol != :ed_insert
    process_insert(force: not_insertion)
  end
  if @vi_arg and argumentable?(method_obj)
    if with_operator and inclusive?(method_obj)
      method_obj.(key, arg: @vi_arg, inclusive: true)
    else
      method_obj.(key, arg: @vi_arg)
    end
  else
    if with_operator and inclusive?(method_obj)
      method_obj.(key, inclusive: true)
    else
      method_obj.(key)
    end
  end
end

# File reline/line_editor.rb, line 1457
        def argumentable?(method_obj)
  method_obj and method_obj.parameters.any? { |param| param[0] == :key and param[1] == :arg }
end

# File reline/line_editor.rb, line 1934
        def byteinsert(str, byte_pointer, other)
  new_str = str.byteslice(0, byte_pointer)
  new_str << other
  new_str << str.byteslice(byte_pointer, str.bytesize)
  new_str
end

# File reline/line_editor.rb, line 1928
        def byteslice!(str, byte_pointer, size)
  new_str = str.byteslice(0, byte_pointer)
  new_str << str.byteslice(byte_pointer + size, str.bytesize)
  [new_str, str.byteslice(byte_pointer, size)]
end

# File reline/line_editor.rb, line 327
        def calculate_height_by_lines(lines, prompt)
  result = 0
  prompt_list = prompt.is_a?(Array) ? prompt : nil
  lines.each_with_index { |line, i|
    prompt = prompt_list[i] if prompt_list and prompt_list[i]
    result += calculate_height_by_width(calculate_width(prompt, true) + calculate_width(line))
  }
  result
end

# File reline/line_editor.rb, line 345
        def calculate_height_by_width(width)
  width.div(@screen_size.last) + 1
end

# File reline/line_editor.rb, line 383
        def calculate_nearest_cursor(line_to_calc = @line, cursor = @cursor, started_from = @started_from, byte_pointer = @byte_pointer, update = true)
  new_cursor_max = calculate_width(line_to_calc)
  new_cursor = 0
  new_byte_pointer = 0
  height = 1
  max_width = @screen_size.last
  if @config.editing_mode_is?(:vi_command)
    last_byte_size = Reline::Unicode.get_prev_mbchar_size(line_to_calc, line_to_calc.bytesize)
    if last_byte_size > 0
      last_mbchar = line_to_calc.byteslice(line_to_calc.bytesize - last_byte_size, last_byte_size)
      last_width = Reline::Unicode.get_mbchar_width(last_mbchar)
      end_of_line_cursor = new_cursor_max - last_width
    else
    end_of_line_cursor = new_cursor_max
    end
  else
  end_of_line_cursor = new_cursor_max
  end
  line_to_calc.grapheme_clusters.each do |gc|
    mbchar = gc.encode(Encoding::UTF_8)
    mbchar_width = Reline::Unicode.get_mbchar_width(mbchar)
    now = new_cursor + mbchar_width
    if now > end_of_line_cursor or now > cursor
      break
    end
    new_cursor += mbchar_width
    if new_cursor > max_width * height
      height += 1
    end
    new_byte_pointer += gc.bytesize
  end
  new_started_from = height - 1
  if update
    @cursor = new_cursor
    @cursor_max = new_cursor_max
    @started_from = new_started_from
    @byte_pointer = new_byte_pointer
  else
    [new_cursor, new_cursor_max, new_started_from, new_byte_pointer]
  end
end

# File reline/line_editor.rb, line 924
        def calculate_scroll_partial_screen(highest_in_all, cursor_y)
  if @screen_height < highest_in_all
    old_scroll_partial_screen = @scroll_partial_screen
    if cursor_y == 0
      @scroll_partial_screen = 0
    elsif cursor_y == (highest_in_all - 1)
      @scroll_partial_screen = highest_in_all - @screen_height
    else
      if @scroll_partial_screen
        if cursor_y <= @scroll_partial_screen
          @scroll_partial_screen = cursor_y
        elsif (@scroll_partial_screen + @screen_height - 1) < cursor_y
          @scroll_partial_screen = cursor_y - (@screen_height - 1)
        end
      else
        if cursor_y > (@screen_height - 1)
          @scroll_partial_screen = cursor_y - (@screen_height - 1)
        else
          @scroll_partial_screen = 0
        end
      end
    end
    if @scroll_partial_screen != old_scroll_partial_screen
      @rerender_all = true
    end
  else
    if @scroll_partial_screen
      @rerender_all = true
    end
    @scroll_partial_screen = nil
  end
end

# File reline/line_editor.rb, line 1941
        def calculate_width(str, allow_escape_code = false)
  Reline::Unicode.calculate_width(str, allow_escape_code)
end

# File reline/line_editor.rb, line 76
        def check_mode_string
  mode_string = nil
  if @config.show_mode_in_prompt
    if @config.editing_mode_is?(:vi_command)
      mode_string = @config.vi_cmd_mode_string
    elsif @config.editing_mode_is?(:vi_insert)
      mode_string = @config.vi_ins_mode_string
    elsif @config.editing_mode_is?(:emacs)
      mode_string = @config.emacs_mode_string
    else
      mode_string = '?'
    end
  end
  if mode_string != @prev_mode_string
    @rerender_all = true
  end
  @prev_mode_string = mode_string
  mode_string
end

# File reline/line_editor.rb, line 96
        def check_multiline_prompt(buffer)
  if @vi_arg
    prompt = "(arg: #{@vi_arg}) "
    @rerender_all = true
  elsif @searching_prompt
    prompt = @searching_prompt
    @rerender_all = true
  else
    prompt = @prompt
  end
  if simplified_rendering?
    mode_string = check_mode_string
    prompt = mode_string + prompt if mode_string
    return [prompt, calculate_width(prompt, true), [prompt] * buffer.size]
  end
  if @prompt_proc
    use_cached_prompt_list = false
    if @cached_prompt_list
      if @just_cursor_moving
        use_cached_prompt_list = true
      elsif Time.now.to_f < (@prompt_cache_time + PROMPT_LIST_CACHE_TIMEOUT) and buffer.size == @cached_prompt_list.size
        use_cached_prompt_list = true
      end
    end
    use_cached_prompt_list = false if @rerender_all
    if use_cached_prompt_list
      prompt_list = @cached_prompt_list
    else
      prompt_list = @cached_prompt_list = @prompt_proc.(buffer).map { |pr| pr.gsub("\n", "\\n") }
      @prompt_cache_time = Time.now.to_f
    end
    prompt_list.map!{ prompt } if @vi_arg or @searching_prompt
    prompt_list = [prompt] if prompt_list.empty?
    mode_string = check_mode_string
    prompt_list = prompt_list.map{ |pr| mode_string + pr } if mode_string
    prompt = prompt_list[@line_index]
    prompt = prompt_list[0] if prompt.nil?
    prompt = prompt_list.last if prompt.nil?
    if buffer.size > prompt_list.size
      (buffer.size - prompt_list.size).times do
        prompt_list << prompt_list.last
      end
    end
    prompt_width = calculate_width(prompt, true)
    [prompt, prompt_width, prompt_list]
  else
    mode_string = check_mode_string
    prompt = mode_string + prompt if mode_string
    prompt_width = calculate_width(prompt, true)
    [prompt, prompt_width, nil]
  end
end

# File reline/line_editor.rb, line 880
        def clear_dialog
  @dialogs.each do |dialog|
    clear_each_dialog(dialog)
  end
end

# File reline/line_editor.rb, line 886
        def clear_each_dialog(dialog)
  dialog.trap_key = nil
  return unless dialog.contents
  prompt, prompt_width, prompt_list = check_multiline_prompt(dialog.lines_backup[:lines])
  visual_lines = []
  visual_lines_under_dialog = []
  visual_start = nil
  dialog.lines_backup[:lines].each_with_index { |l, i|
    pr = prompt_list ? prompt_list[i] : prompt
    vl, _ = split_by_width(pr + l, @screen_size.last)
    vl.compact!
    if i == dialog.lines_backup[:line_index]
      visual_start = visual_lines.size + dialog.lines_backup[:started_from] + dialog.vertical_offset
    end
    visual_lines.concat(vl)
  }
  visual_lines_under_dialog = visual_lines[visual_start, dialog.contents.size]
  visual_lines_under_dialog = [] if visual_lines_under_dialog.nil?
  Reline::IOGate.hide_cursor
  move_cursor_down(dialog.vertical_offset)
  dialog_vertical_size = dialog.contents.size
  dialog_vertical_size.times do |i|
    if i < visual_lines_under_dialog.size
      Reline::IOGate.move_cursor_column(dialog.column)
      str = Reline::Unicode.take_range(visual_lines_under_dialog[i], dialog.column, dialog.width)
      str = padding_space_with_escape_sequences(str, dialog.width)
      @output.write "\e[0m#{str}\e[0m"
    else
      Reline::IOGate.move_cursor_column(dialog.column)
      @output.write "\e[0m#{' ' * dialog.width}\e[0m"
    end
    move_cursor_down(1) if i < (dialog_vertical_size - 1)
  end
  move_cursor_up(dialog_vertical_size - 1 + dialog.vertical_offset)
  Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
  Reline::IOGate.show_cursor
end

# File reline/line_editor.rb, line 1254
        def clear_screen_buffer(prompt, prompt_list, prompt_width)
  Reline::IOGate.clear_screen
  back = 0
  modify_lines(whole_lines).each_with_index do |line, index|
    if @prompt_proc
      pr = prompt_list[index]
      height = render_partial(pr, calculate_width(pr), line, back, with_control: false)
    else
      height = render_partial(prompt, prompt_width, line, back, with_control: false)
    end
    if index < (@buffer_of_lines.size - 1)
      move_cursor_down(1)
      back += height
    end
  end
  move_cursor_up(back)
  move_cursor_down(@first_line_started_from + @started_from)
  @rest_height = (Reline::IOGate.get_screen_size.first - 1) - Reline::IOGate.cursor_pos.y
  Reline::IOGate.move_cursor_column((prompt_width + @cursor) % @screen_size.last)
end

# File reline/line_editor.rb, line 1329
        def complete(list, just_show_list = false)
  case @completion_state
  when CompletionState::NORMAL, CompletionState::JOURNEY
    @completion_state = CompletionState::COMPLETION
  when CompletionState::PERFECT_MATCH
    @dig_perfect_match_proc&.(@perfect_matched)
  end
  if just_show_list
    is_menu = true
  elsif @completion_state == CompletionState::MENU
    is_menu = true
  elsif @completion_state == CompletionState::MENU_WITH_PERFECT_MATCH
    is_menu = true
  else
    is_menu = false
  end
  result = complete_internal_proc(list, is_menu)
  if @completion_state == CompletionState::MENU_WITH_PERFECT_MATCH
    @completion_state = CompletionState::PERFECT_MATCH
  end
  return if result.nil?
  target, preposing, completed, postposing = result
  return if completed.nil?
  if target <= completed and (@completion_state == CompletionState::COMPLETION)
    if list.include?(completed)
      if list.one?
        @completion_state = CompletionState::PERFECT_MATCH
      else
        @completion_state = CompletionState::MENU_WITH_PERFECT_MATCH
      end
      @perfect_matched = completed
    else
      @completion_state = CompletionState::MENU
    end
    if not just_show_list and target < completed
      @line = preposing + completed + completion_append_character.to_s + postposing
      line_to_pointer = preposing + completed + completion_append_character.to_s
      @cursor_max = calculate_width(@line)
      @cursor = calculate_width(line_to_pointer)
      @byte_pointer = line_to_pointer.bytesize
    end
  end
end

# File reline/line_editor.rb, line 1283
        def complete_internal_proc(list, is_menu)
  preposing, target, postposing = retrieve_completion_block
  list = list.select { |i|
    if i and not Encoding.compatible?(target.encoding, i.encoding)
      raise Encoding::CompatibilityError, "#{target.encoding.name} is not compatible with #{i.encoding.name}"
    end
    if @config.completion_ignore_case
      i&.downcase&.start_with?(target.downcase)
    else
      i&.start_with?(target)
    end
  }.uniq
  if is_menu
    menu(target, list)
    return nil
  end
  completed = list.inject { |memo, item|
    begin
      memo_mbchars = memo.unicode_normalize.grapheme_clusters
      item_mbchars = item.unicode_normalize.grapheme_clusters
    rescue Encoding::CompatibilityError
      memo_mbchars = memo.grapheme_clusters
      item_mbchars = item.grapheme_clusters
    end
    size = [memo_mbchars.size, item_mbchars.size].min
    result = ''
    size.times do |i|
      if @config.completion_ignore_case
        if memo_mbchars[i].casecmp?(item_mbchars[i])
          result << memo_mbchars[i]
        else
          break
        end
      else
        if memo_mbchars[i] == item_mbchars[i]
          result << memo_mbchars[i]
        else
          break
        end
      end
    end
    result
  }
  [target, preposing, completed, postposing]
end

# File reline/line_editor.rb, line 2852
        def copy_for_vi(text)
  if @config.editing_mode_is?(:vi_insert) or @config.editing_mode_is?(:vi_command)
    @vi_clipboard = text
  end
end

# File reline/line_editor.rb, line 3151
        def ed_argument_digit(key)
  if @vi_arg.nil?
    if key.chr.to_i.zero?
      if key.anybits?(0b10000000)
        unescaped_key = key ^ 0b10000000
        unless unescaped_key.chr.to_i.zero?
          @vi_arg = unescaped_key.chr.to_i
        end
      end
    else
      @vi_arg = key.chr.to_i
    end
  else
    @vi_arg = @vi_arg * 10 + key.chr.to_i
  end
end

# File reline/line_editor.rb, line 2718
        def ed_clear_screen(key)
  @cleared = true
end

# File reline/line_editor.rb, line 3063
        def ed_delete_next_char(key, arg: 1)
  byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
  unless @line.empty? || byte_size == 0
    @line, mbchar = byteslice!(@line, @byte_pointer, byte_size)
    copy_for_vi(mbchar)
    width = Reline::Unicode.get_mbchar_width(mbchar)
    @cursor_max -= width
    if @cursor > 0 and @cursor >= @cursor_max
      byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
      mbchar = @line.byteslice(@byte_pointer - byte_size, byte_size)
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @byte_pointer -= byte_size
      @cursor -= width
    end
  end
  arg -= 1
  ed_delete_next_char(key, arg: arg) if arg > 0
end

# File reline/line_editor.rb, line 2981
        def ed_delete_prev_char(key, arg: 1)
  deleted = ''
  arg.times do
    if @cursor > 0
      byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
      @byte_pointer -= byte_size
      @line, mbchar = byteslice!(@line, @byte_pointer, byte_size)
      deleted.prepend(mbchar)
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @cursor -= width
      @cursor_max -= width
    end
  end
  copy_for_vi(deleted)
end

# File reline/line_editor.rb, line 2750
        def ed_delete_prev_word(key)
  if @byte_pointer > 0
    byte_size, width = Reline::Unicode.em_backward_word(@line, @byte_pointer)
    @line, word = byteslice!(@line, @byte_pointer - byte_size, byte_size)
    @kill_ring.append(word, true)
    @byte_pointer -= byte_size
    @cursor -= width
    @cursor_max -= width
  end
end

# File reline/line_editor.rb, line 1996
        def ed_insert(key)
  str = nil
  width = nil
  bytesize = nil
  if key.instance_of?(String)
    begin
      key.encode(Encoding::UTF_8)
    rescue Encoding::UndefinedConversionError
      return
    end
    str = key
    bytesize = key.bytesize
  else
    begin
      key.chr.encode(Encoding::UTF_8)
    rescue Encoding::UndefinedConversionError
      return
    end
    str = key.chr
    bytesize = 1
  end
  if @in_pasting
    @continuous_insertion_buffer << str
    return
  elsif not @continuous_insertion_buffer.empty?
    process_insert
  end
  width = Reline::Unicode.get_mbchar_width(str)
  if @cursor == @cursor_max
    @line += str
  else
    @line = byteinsert(@line, @byte_pointer, str)
  end
  last_byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
  @byte_pointer += bytesize
  last_mbchar = @line.byteslice((@byte_pointer - bytesize - last_byte_size), last_byte_size)
  combined_char = last_mbchar + str
  if last_byte_size != 0 and combined_char.grapheme_clusters.size == 1
    # combined char
    last_mbchar_width = Reline::Unicode.get_mbchar_width(last_mbchar)
    combined_char_width = Reline::Unicode.get_mbchar_width(combined_char)
    if combined_char_width > last_mbchar_width
      width = combined_char_width - last_mbchar_width
    else
      width = 0
    end
  end
  @cursor += width
  @cursor_max += width
end

# File reline/line_editor.rb, line 2601
        def ed_kill_line(key)
  if @line.bytesize > @byte_pointer
    @line, deleted = byteslice!(@line, @byte_pointer, @line.bytesize - @byte_pointer)
    @byte_pointer = @line.bytesize
    @cursor = @cursor_max = calculate_width(@line)
    @kill_ring.append(deleted)
  elsif @is_multiline and @byte_pointer == @line.bytesize and @buffer_of_lines.size > @line_index + 1
    @cursor = calculate_width(@line)
    @byte_pointer = @line.bytesize
    @line += @buffer_of_lines.delete_at(@line_index + 1)
    @cursor_max = calculate_width(@line)
    @buffer_of_lines[@line_index] = @line
    @rerender_all = true
    @rest_height += 1
  end
end

# File reline/line_editor.rb, line 2109
        def ed_move_to_beg(key)
  @byte_pointer = @cursor = 0
end

# File reline/line_editor.rb, line 2114
        def ed_move_to_end(key)
  @byte_pointer = 0
  @cursor = 0
  byte_size = 0
  while @byte_pointer < @line.bytesize
    byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
    if byte_size > 0
      mbchar = @line.byteslice(@byte_pointer, byte_size)
      @cursor += Reline::Unicode.get_mbchar_width(mbchar)
    end
    @byte_pointer += byte_size
  end
end

# File reline/line_editor.rb, line 2540
        def ed_newline(key)
  process_insert(force: true)
  if @is_multiline
    if @config.editing_mode_is?(:vi_command)
      if @line_index < (@buffer_of_lines.size - 1)
        ed_next_history(key) # means cursor down
      else
        # should check confirm_multiline_termination to finish?
        finish
      end
    else
      if @line_index == (@buffer_of_lines.size - 1)
        if confirm_multiline_termination
          finish
        else
          key_newline(key)
        end
      else
        # should check confirm_multiline_termination to finish?
        @previous_line_index = @line_index
        @line_index = @buffer_of_lines.size - 1
        finish
      end
    end
  else
    if @history_pointer
      Reline::HISTORY[@history_pointer] = @line
      @history_pointer = nil
    end
    finish
  end
end

# File reline/line_editor.rb, line 2065
        def ed_next_char(key, arg: 1)
  byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
  if (@byte_pointer < @line.bytesize)
    mbchar = @line.byteslice(@byte_pointer, byte_size)
    width = Reline::Unicode.get_mbchar_width(mbchar)
    @cursor += width if width
    @byte_pointer += byte_size
  elsif @is_multiline and @config.editing_mode_is?(:emacs) and @byte_pointer == @line.bytesize and @line_index < @buffer_of_lines.size - 1
    next_line = @buffer_of_lines[@line_index + 1]
    @cursor = 0
    @byte_pointer = 0
    @cursor_max = calculate_width(next_line)
    @previous_line_index = @line_index
    @line_index += 1
  end
  arg -= 1
  ed_next_char(key, arg: arg) if arg > 0
end

# File reline/line_editor.rb, line 2492
        def ed_next_history(key, arg: 1)
  if @is_multiline and @line_index < (@buffer_of_lines.size - 1)
    @previous_line_index = @line_index
    @line_index += 1
    return
  end
  if @history_pointer.nil?
    return
  elsif @history_pointer == (Reline::HISTORY.size - 1)
    if @is_multiline
      @history_pointer = nil
      @buffer_of_lines = @line_backup_in_history.split("\n")
      @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
      @line_index = 0
      @line = @buffer_of_lines.first
      @rerender_all = true
    else
      @history_pointer = nil
      @line = @line_backup_in_history
    end
  else
    if @is_multiline
      Reline::HISTORY[@history_pointer] = whole_buffer
      @history_pointer += 1
      @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
      @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
      @line_index = 0
      @line = @buffer_of_lines.first
      @rerender_all = true
    else
      Reline::HISTORY[@history_pointer] = @line
      @history_pointer += 1
      @line = Reline::HISTORY[@history_pointer]
    end
  end
  @line = '' unless @line
  if @config.editing_mode_is?(:emacs, :vi_insert)
    @cursor_max = @cursor = calculate_width(@line)
    @byte_pointer = @line.bytesize
  elsif @config.editing_mode_is?(:vi_command)
    @byte_pointer = @cursor = 0
    @cursor_max = calculate_width(@line)
  end
  arg -= 1
  ed_next_history(key, arg: arg) if arg > 0
end

# File reline/line_editor.rb, line 2085
        def ed_prev_char(key, arg: 1)
  if @cursor > 0
    byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
    @byte_pointer -= byte_size
    mbchar = @line.byteslice(@byte_pointer, byte_size)
    width = Reline::Unicode.get_mbchar_width(mbchar)
    @cursor -= width
  elsif @is_multiline and @config.editing_mode_is?(:emacs) and @byte_pointer == 0 and @line_index > 0
    prev_line = @buffer_of_lines[@line_index - 1]
    @cursor = calculate_width(prev_line)
    @byte_pointer = prev_line.bytesize
    @cursor_max = calculate_width(prev_line)
    @previous_line_index = @line_index
    @line_index -= 1
  end
  arg -= 1
  ed_prev_char(key, arg: arg) if arg > 0
end

# File reline/line_editor.rb, line 2441
        def ed_prev_history(key, arg: 1)
  if @is_multiline and @line_index > 0
    @previous_line_index = @line_index
    @line_index -= 1
    return
  end
  if Reline::HISTORY.empty?
    return
  end
  if @history_pointer.nil?
    @history_pointer = Reline::HISTORY.size - 1
    if @is_multiline
      @line_backup_in_history = whole_buffer
      @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
      @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
      @line_index = @buffer_of_lines.size - 1
      @line = @buffer_of_lines.last
      @rerender_all = true
    else
      @line_backup_in_history = @line
      @line = Reline::HISTORY[@history_pointer]
    end
  elsif @history_pointer.zero?
    return
  else
    if @is_multiline
      Reline::HISTORY[@history_pointer] = whole_buffer
      @history_pointer -= 1
      @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
      @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
      @line_index = @buffer_of_lines.size - 1
      @line = @buffer_of_lines.last
      @rerender_all = true
    else
      Reline::HISTORY[@history_pointer] = @line
      @history_pointer -= 1
      @line = Reline::HISTORY[@history_pointer]
    end
  end
  if @config.editing_mode_is?(:emacs, :vi_insert)
    @cursor_max = @cursor = calculate_width(@line)
    @byte_pointer = @line.bytesize
  elsif @config.editing_mode_is?(:vi_command)
    @byte_pointer = @cursor = 0
    @cursor_max = calculate_width(@line)
  end
  arg -= 1
  ed_prev_history(key, arg: arg) if arg > 0
end

# File reline/line_editor.rb, line 2732
        def ed_prev_word(key)
  if @byte_pointer > 0
    byte_size, width = Reline::Unicode.em_backward_word(@line, @byte_pointer)
    @byte_pointer -= byte_size
    @cursor -= width
  end
end

# File reline/line_editor.rb, line 2049
        def ed_quoted_insert(str, arg: 1)
  @waiting_proc = proc { |key|
    arg.times do
      if key == "\C-j".ord or key == "\C-m".ord
        key_newline(key)
      elsif key == 0
        # Ignore NUL.
      else
        ed_insert(key)
      end
    end
    @waiting_proc = nil
  }
end

# File reline/line_editor.rb, line 2389
        def ed_search_next_history(key, arg: 1)
  substr = @line.slice(0, @byte_pointer)
  if @history_pointer.nil?
    return
  elsif @history_pointer == (Reline::HISTORY.size - 1) and not substr.empty?
    return
  end
  history = Reline::HISTORY.slice((@history_pointer + 1)..-1)
  h_pointer = nil
  line_no = nil
  if @is_multiline
    h_pointer = history.index { |h|
      h.split("\n").each_with_index { |l, i|
        if l.start_with?(substr)
          line_no = i
          break
        end
      }
      not line_no.nil?
    }
  else
    h_pointer = history.index { |l|
      l.start_with?(substr)
    }
  end
  h_pointer += @history_pointer + 1 if h_pointer and @history_pointer
  return if h_pointer.nil? and not substr.empty?
  @history_pointer = h_pointer
  if @is_multiline
    if @history_pointer.nil? and substr.empty?
      @buffer_of_lines = []
      @line_index = 0
    else
      @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
      @line_index = line_no
    end
    @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
    @line = @buffer_of_lines[@line_index]
    @rerender_all = true
  else
    if @history_pointer.nil? and substr.empty?
      @line = ''
    else
      @line = Reline::HISTORY[@history_pointer]
    end
  end
  @cursor_max = calculate_width(@line)
  arg -= 1
  ed_search_next_history(key, arg: arg) if arg > 0
end

# File reline/line_editor.rb, line 2342
        def ed_search_prev_history(key, arg: 1)
  history = nil
  h_pointer = nil
  line_no = nil
  substr = @line.slice(0, @byte_pointer)
  if @history_pointer.nil?
    return if not @line.empty? and substr.empty?
    history = Reline::HISTORY
  elsif @history_pointer.zero?
    history = nil
    h_pointer = nil
  else
    history = Reline::HISTORY.slice(0, @history_pointer)
  end
  return if history.nil?
  if @is_multiline
    h_pointer = history.rindex { |h|
      h.split("\n").each_with_index { |l, i|
        if l.start_with?(substr)
          line_no = i
          break
        end
      }
      not line_no.nil?
    }
  else
    h_pointer = history.rindex { |l|
      l.start_with?(substr)
    }
  end
  return if h_pointer.nil?
  @history_pointer = h_pointer
  if @is_multiline
    @buffer_of_lines = Reline::HISTORY[@history_pointer].split("\n")
    @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
    @line_index = line_no
    @line = @buffer_of_lines[@line_index]
    @rerender_all = true
  else
    @line = Reline::HISTORY[@history_pointer]
  end
  @cursor_max = calculate_width(@line)
  arg -= 1
  ed_search_prev_history(key, arg: arg) if arg > 0
end

# File reline/line_editor.rb, line 2761
        def ed_transpose_chars(key)
  if @byte_pointer > 0
    if @cursor_max > @cursor
      byte_size = Reline::Unicode.get_next_mbchar_size(@line, @byte_pointer)
      mbchar = @line.byteslice(@byte_pointer, byte_size)
      width = Reline::Unicode.get_mbchar_width(mbchar)
      @cursor += width
      @byte_pointer += byte_size
    end
    back1_byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
    if (@byte_pointer - back1_byte_size) > 0
      back2_byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer - back1_byte_size)
      back2_pointer = @byte_pointer - back1_byte_size - back2_byte_size
      @line, back2_mbchar = byteslice!(@line, back2_pointer, back2_byte_size)
      @line = byteinsert(@line, @byte_pointer - back2_byte_size, back2_mbchar)
    end
  end
end

# File reline/line_editor.rb, line 2781
        def ed_transpose_words(key)
  left_word_start, middle_start, right_word_start, after_start = Reline::Unicode.ed_transpose_words(@line, @byte_pointer)
  before = @line.byteslice(0, left_word_start)
  left_word = @line.byteslice(left_word_start, middle_start - left_word_start)
  middle = @line.byteslice(middle_start, right_word_start - middle_start)
  right_word = @line.byteslice(right_word_start, after_start - right_word_start)
  after = @line.byteslice(after_start, @line.bytesize - after_start)
  return if left_word.empty? or right_word.empty?
  @line = before + right_word + middle + left_word + after
  from_head_to_left_word = before + right_word + middle + left_word
  @byte_pointer = from_head_to_left_word.bytesize
  @cursor = calculate_width(from_head_to_left_word)
end

# File reline/line_editor.rb, line 1966
def ed_unassigned(key) end

# File reline/line_editor.rb, line 2796
        def em_capitol_case(key)
  if @line.bytesize > @byte_pointer
    byte_size, _, new_str = Reline::Unicode.em_forward_word_with_capitalization(@line, @byte_pointer)
    before = @line.byteslice(0, @byte_pointer)
    after = @line.byteslice((@byte_pointer + byte_size)..-1)
    @line = before + new_str + after
    @byte_pointer += new_str.bytesize
    @cursor += calculate_width(new_str)
  end
end

# File reline/line_editor.rb, line 2650
        def em_delete(key)
  if (not @is_multiline and @line.empty?) or (@is_multiline and @line.empty? and @buffer_of_lines.size == 1)
    @line = nil
    if @buffer_of_lines.size > 1
      scroll_down(@highest_in_all - @first_line_started_from)
    end
    Reline::IOGate.move_cursor_column(0)
    @eof = true
    finish
  elsif @byte_pointer < @line.bytesize
    splitted_last = @line.byteslice(@byte_pointer, @line.bytesize)
    mbchar = splitted_last.grapheme_clusters.first
    width = Reline::Unicode.get_mbchar_width(mbchar)
    @cursor_max -= width
    @line, = byteslice!(@line, @byte_pointer, mbchar.bytesize)
  elsif @is_multiline and @byte_pointer == @line.bytesize and @buffer_of_lines.size > @line_index + 1
    @cursor = calculate_width(@line)
    @byte_pointer = @line.bytesize
    @line += @buffer_of_lines.delete_at(@line_index + 1)
    @cursor_max = calculate_width(@line)
    @buffer_of_lines[@line_index] = @line
    @rerender_all = true
    @rest_height += 1
  end
end

# File reline/line_editor.rb, line 2741
        def em_delete_next_word(key)
  if @line.bytesize > @byte_pointer
    byte_size, width = Reline::Unicode.em_forward_word(@line, @byte_pointer)
    @line, word = byteslice!(@line, @byte_pointer, byte_size)
    @kill_ring.append(word)
    @cursor_max -= width
  end
end

# File reline/line_editor.rb, line 2677
        def em_delete_or_list(key)
  if @line.empty? or @byte_pointer < @line.bytesize
    em_delete(key)
  else # show completed list
    result = call_completion_proc
    if result.is_a?(Array)
      complete(result, true)
    end
  end
end

# File reline/line_editor.rb, line 2573
        def em_delete_prev_char(key, arg: 1)
  if @is_multiline and @cursor == 0 and @line_index > 0
    @buffer_of_lines[@line_index] = @line
    @cursor = calculate_width(@buffer_of_lines[@line_index - 1])
    @byte_pointer = @buffer_of_lines[@line_index - 1].bytesize
    @buffer_of_lines[@line_index - 1] += @buffer_of_lines.delete_at(@line_index)
    @line_index -= 1
    @line = @buffer_of_lines[@line_index]
    @cursor_max = calculate_width(@line)
    @rerender_all = true
  elsif @cursor > 0
    byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
    @byte_pointer -= byte_size
    @line, mbchar = byteslice!(@line, @byte_pointer, byte_size)
    width = Reline::Unicode.get_mbchar_width(mbchar)
    @cursor -= width
    @cursor_max -= width
  end
  arg -= 1
  em_delete_prev_char(key, arg: arg) if arg > 0
end

# File reline/line_editor.rb, line 3335
        def em_exchange_mark(key)
  return unless @mark_pointer
  new_pointer = [@byte_pointer, @line_index]
  @previous_line_index = @line_index
  @byte_pointer, @line_index = @mark_pointer
  @cursor = calculate_width(@line.byteslice(0, @byte_pointer))
  @cursor_max = calculate_width(@line)
  @mark_pointer = new_pointer
end

# File reline/line_editor.rb, line 2639
        def em_kill_line(key)
  if @line.size > 0
    @kill_ring.append(@line.dup, true)
    @line.clear
    @byte_pointer = 0
    @cursor_max = 0
    @cursor = 0
  end
end

# File reline/line_editor.rb, line 2840
        def em_kill_region(key)
  if @byte_pointer > 0
    byte_size, width = Reline::Unicode.em_big_backward_word(@line, @byte_pointer)
    @line, deleted = byteslice!(@line, @byte_pointer - byte_size, byte_size)
    @byte_pointer -= byte_size
    @cursor -= width
    @cursor_max -= width
    @kill_ring.append(deleted, true)
  end
end

# File reline/line_editor.rb, line 2808
        def em_lower_case(key)
  if @line.bytesize > @byte_pointer
    byte_size, = Reline::Unicode.em_forward_word(@line, @byte_pointer)
    part = @line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { |mbchar|
      mbchar =~ /[A-Z]/ ? mbchar.downcase : mbchar
    }.join
    rest = @line.byteslice((@byte_pointer + byte_size)..-1)
    @line = @line.byteslice(0, @byte_pointer) + part
    @byte_pointer = @line.bytesize
    @cursor = calculate_width(@line)
    @cursor_max = @cursor + calculate_width(rest)
    @line += rest
  end
end

# File reline/line_editor.rb, line 2723
        def em_next_word(key)
  if @line.bytesize > @byte_pointer
    byte_size, width = Reline::Unicode.em_forward_word(@line, @byte_pointer)
    @byte_pointer += byte_size
    @cursor += width
  end
end

# File reline/line_editor.rb, line 3330
        def em_set_mark(key)
  @mark_pointer = [@byte_pointer, @line_index]
end

# File reline/line_editor.rb, line 2824
        def em_upper_case(key)
  if @line.bytesize > @byte_pointer
    byte_size, = Reline::Unicode.em_forward_word(@line, @byte_pointer)
    part = @line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { |mbchar|
      mbchar =~ /[a-z]/ ? mbchar.upcase : mbchar
    }.join
    rest = @line.byteslice((@byte_pointer + byte_size)..-1)
    @line = @line.byteslice(0, @byte_pointer) + part
    @byte_pointer = @line.bytesize
    @cursor = calculate_width(@line)
    @cursor_max = @cursor + calculate_width(rest)
    @line += rest
  end
end

# File reline/line_editor.rb, line 2689
        def em_yank(key)
  yanked = @kill_ring.yank
  if yanked
    @line = byteinsert(@line, @byte_pointer, yanked)
    yanked_width = calculate_width(yanked)
    @cursor += yanked_width
    @cursor_max += yanked_width
    @byte_pointer += yanked.bytesize
  end
end

# File reline/line_editor.rb, line 2701
        def em_yank_pop(key)
  yanked, prev_yank = @kill_ring.yank_pop
  if yanked
    prev_yank_width = calculate_width(prev_yank)
    @cursor -= prev_yank_width
    @cursor_max -= prev_yank_width
    @byte_pointer -= prev_yank.bytesize
    @line, = byteslice!(@line, @byte_pointer, prev_yank.bytesize)
    @line = byteinsert(@line, @byte_pointer, yanked)
    yanked_width = calculate_width(yanked)
    @cursor += yanked_width
    @cursor_max += yanked_width
    @byte_pointer += yanked.bytesize
  end
end

# File reline/line_editor.rb, line 2129
        def generate_searcher
  Fiber.new do |first_key|
    prev_search_key = first_key
    search_word = String.new(encoding: @encoding)
    multibyte_buf = String.new(encoding: 'ASCII-8BIT')
    last_hit = nil
    case first_key
    when "\C-r".ord
      prompt_name = 'reverse-i-search'
    when "\C-s".ord
      prompt_name = 'i-search'
    end
    loop do
      key = Fiber.yield(search_word)
      search_again = false
      case key
      when -1 # determined
        Reline.last_incremental_search = search_word
        break
      when "\C-h".ord, "\C-?".ord
        grapheme_clusters = search_word.grapheme_clusters
        if grapheme_clusters.size > 0
          grapheme_clusters.pop
          search_word = grapheme_clusters.join
        end
      when "\C-r".ord, "\C-s".ord
        search_again = true if prev_search_key == key
        prev_search_key = key
      else
        multibyte_buf << key
        if multibyte_buf.dup.force_encoding(@encoding).valid_encoding?
          search_word << multibyte_buf.dup.force_encoding(@encoding)
          multibyte_buf.clear
        end
      end
      hit = nil
      if not search_word.empty? and @line_backup_in_history&.include?(search_word)
        @history_pointer = nil
        hit = @line_backup_in_history
      else
        if search_again
          if search_word.empty? and Reline.last_incremental_search
            search_word = Reline.last_incremental_search
          end
          if @history_pointer
            case prev_search_key
            when "\C-r".ord
              history_pointer_base = 0
              history = Reline::HISTORY[0..(@history_pointer - 1)]
            when "\C-s".ord
              history_pointer_base = @history_pointer + 1
              history = Reline::HISTORY[(@history_pointer + 1)..-1]
            end
          else
            history_pointer_base = 0
            history = Reline::HISTORY
          end
        elsif @history_pointer
          case prev_search_key
          when "\C-r".ord
            history_pointer_base = 0
            history = Reline::HISTORY[0..@history_pointer]
          when "\C-s".ord
            history_pointer_base = @history_pointer
            history = Reline::HISTORY[@history_pointer..-1]
          end
        else
          history_pointer_base = 0
          history = Reline::HISTORY
        end
        case prev_search_key
        when "\C-r".ord
          hit_index = history.rindex { |item|
            item.include?(search_word)
          }
        when "\C-s".ord
          hit_index = history.index { |item|
            item.include?(search_word)
          }
        end
        if hit_index
          @history_pointer = history_pointer_base + hit_index
          hit = Reline::HISTORY[@history_pointer]
        end
      end
      case prev_search_key
      when "\C-r".ord
        prompt_name = 'reverse-i-search'
      when "\C-s".ord
        prompt_name = 'i-search'
      end
      if hit
        if @is_multiline
          @buffer_of_lines = hit.split("\n")
          @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
          @line_index = @buffer_of_lines.size - 1
          @line = @buffer_of_lines.last
          @rerender_all = true
          @searching_prompt = "(%s)`%s'" % [prompt_name, search_word]
        else
          @line = hit
          @searching_prompt = "(%s)`%s': %s" % [prompt_name, search_word, hit]
        end
        last_hit = hit
      else
        if @is_multiline
          @rerender_all = true
          @searching_prompt = "(failed %s)`%s'" % [prompt_name, search_word]
        else
          @searching_prompt = "(failed %s)`%s': %s" % [prompt_name, search_word, last_hit]
        end
      end
    end
  end
end

# File reline/line_editor.rb, line 1461
        def inclusive?(method_obj)
  # If a motion method with the keyword argument "inclusive" follows the
  # operator, it must contain the character at the cursor position.
  method_obj and method_obj.parameters.any? { |param| param[0] == :key and param[1] == :inclusive }
end

# File reline/line_editor.rb, line 2245
        def incremental_search_history(key)
  unless @history_pointer
    if @is_multiline
      @line_backup_in_history = whole_buffer
    else
      @line_backup_in_history = @line
    end
  end
  searcher = generate_searcher
  searcher.resume(key)
  @searching_prompt = "(reverse-i-search)`': "
  termination_keys = ["\C-j".ord]
  termination_keys.concat(@config.isearch_terminators&.chars&.map(&:ord)) if @config.isearch_terminators
  @waiting_proc = ->(k) {
    case k
    when *termination_keys
      if @history_pointer
        buffer = Reline::HISTORY[@history_pointer]
      else
        buffer = @line_backup_in_history
      end
      if @is_multiline
        @buffer_of_lines = buffer.split("\n")
        @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
        @line_index = @buffer_of_lines.size - 1
        @line = @buffer_of_lines.last
        @rerender_all = true
      else
        @line = buffer
      end
      @searching_prompt = nil
      @waiting_proc = nil
      @cursor_max = calculate_width(@line)
      @cursor = @byte_pointer = 0
      @rerender_all = true
      @cached_prompt_list = nil
      searcher.resume(-1)
    when "\C-g".ord
      if @is_multiline
        @buffer_of_lines = @line_backup_in_history.split("\n")
        @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
        @line_index = @buffer_of_lines.size - 1
        @line = @buffer_of_lines.last
        @rerender_all = true
      else
        @line = @line_backup_in_history
      end
      @history_pointer = nil
      @searching_prompt = nil
      @waiting_proc = nil
      @line_backup_in_history = nil
      @cursor_max = calculate_width(@line)
      @cursor = @byte_pointer = 0
      @rerender_all = true
    else
      chr = k.is_a?(String) ? k : k.chr(Encoding::ASCII_8BIT)
      if chr.match?(/[[:print:]]/) or k == "\C-h".ord or k == "\C-?".ord or k == "\C-r".ord or k == "\C-s".ord
        searcher.resume(k)
      else
        if @history_pointer
          line = Reline::HISTORY[@history_pointer]
        else
          line = @line_backup_in_history
        end
        if @is_multiline
          @line_backup_in_history = whole_buffer
          @buffer_of_lines = line.split("\n")
          @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
          @line_index = @buffer_of_lines.size - 1
          @line = @buffer_of_lines.last
          @rerender_all = true
        else
          @line_backup_in_history = @line
          @line = line
        end
        @searching_prompt = nil
        @waiting_proc = nil
        @cursor_max = calculate_width(@line)
        @cursor = @byte_pointer = 0
        @rerender_all = true
        @cached_prompt_list = nil
        searcher.resume(-1)
      end
    end
  }
end

# File reline/line_editor.rb, line 337
        def insert_new_line(cursor_line, next_line)
  @line = cursor_line
  @buffer_of_lines.insert(@line_index + 1, String.new(next_line, encoding: @encoding))
  @previous_line_index = @line_index
  @line_index += 1
  @just_cursor_moving = false
end

# File reline/line_editor.rb, line 1945
        def key_delete(key)
  if @config.editing_mode_is?(:vi_insert, :emacs)
    ed_delete_next_char(key)
  end
end

# File reline/line_editor.rb, line 1951
        def key_newline(key)
  if @is_multiline
    if (@buffer_of_lines.size - 1) == @line_index and @line.bytesize == @byte_pointer
      @add_newline_to_end_of_buffer = true
    end
    next_line = @line.byteslice(@byte_pointer, @line.bytesize - @byte_pointer)
    cursor_line = @line.byteslice(0, @byte_pointer)
    insert_new_line(cursor_line, next_line)
    @cursor = 0
    @check_new_auto_indent = true unless @in_pasting
  end
end

# File reline/line_editor.rb, line 1279
        def menu(target, list)
  @menu_info = MenuInfo.new(target, list)
end

# File reline/line_editor.rb, line 1231
        def modify_lines(before)
  return before if before.nil? || before.empty? || simplified_rendering?

  if after = @output_modifier_proc&.call("#{before.join("\n")}\n", complete: finished?)
    after.lines("\n").map { |l| l.chomp('') }
  else
    before
  end
end

# File reline/line_editor.rb, line 1373
        def move_completed_list(list, direction)
  case @completion_state
  when CompletionState::NORMAL, CompletionState::COMPLETION,
       CompletionState::MENU, CompletionState::MENU_WITH_PERFECT_MATCH
    @completion_state = CompletionState::JOURNEY
    result = retrieve_completion_block
    return if result.nil?
    preposing, target, postposing = result
    @completion_journey_data = CompletionJourneyData.new(
      preposing, postposing,
      [target] + list.select{ |item| item.start_with?(target) }, 0)
    if @completion_journey_data.list.size == 1
      @completion_journey_data.pointer = 0
    else
      case direction
      when :up
        @completion_journey_data.pointer = @completion_journey_data.list.size - 1
      when :down
        @completion_journey_data.pointer = 1
      end
    end
    @completion_state = CompletionState::JOURNEY
  else
    case direction
    when :up
      @completion_journey_data.pointer -= 1
      if @completion_journey_data.pointer < 0
        @completion_journey_data.pointer = @completion_journey_data.list.size - 1
      end
    when :down
      @completion_journey_data.pointer += 1
      if @completion_journey_data.pointer >= @completion_journey_data.list.size
        @completion_journey_data.pointer = 0
      end
    end
  end
  completed = @completion_journey_data.list[@completion_journey_data.pointer]
  new_line = (@completion_journey_data.preposing + completed + @completion_journey_data.postposing).split("\n")[@line_index]
  @line = new_line.nil? ? String.new(encoding: @encoding) : new_line
  line_to_pointer = (@completion_journey_data.preposing + completed).split("\n").last
  line_to_pointer = String.new(encoding: @encoding) if line_to_pointer.nil?
  @cursor_max = calculate_width(@line)
  @cursor = calculate_width(line_to_pointer)
  @byte_pointer = line_to_pointer.bytesize
end

# File reline/line_editor.rb, line 373
        def move_cursor_down(val)
  if val > 0
    Reline::IOGate.move_cursor_down(val)
    @rest_height -= val
    @rest_height = 0 if @rest_height < 0
  elsif val < 0
    move_cursor_up(-val)
  end
end

# File reline/line_editor.rb, line 364
        def move_cursor_up(val)
  if val > 0
    Reline::IOGate.move_cursor_up(val)
    @rest_height += val
  elsif val < 0
    move_cursor_down(-val)
  end
end

# File reline/line_editor.rb, line 1544
        def normal_char(key)
  method_symbol = method_obj = nil
  if key.combined_char.is_a?(Symbol)
    process_key(key.combined_char, key.combined_char)
    return
  end
  @multibyte_buffer << key.combined_char
  if @multibyte_buffer.size > 1
    if @multibyte_buffer.dup.force_encoding(@encoding).valid_encoding?
      process_key(@multibyte_buffer.dup.force_encoding(@encoding), nil)
      @multibyte_buffer.clear
    else
      # invalid
      return
    end
  else # single byte
    return if key.char >= 128 # maybe, first byte of multi byte
    method_symbol = @config.editing_mode.get_method(key.combined_char)
    if key.with_meta and method_symbol == :ed_unassigned
      # split ESC + key
      method_symbol = @config.editing_mode.get_method("\e".ord)
      process_key("\e".ord, method_symbol)
      method_symbol = @config.editing_mode.get_method(key.char)
      process_key(key.char, method_symbol)
    else
      process_key(key.combined_char, method_symbol)
    end
    @multibyte_buffer.clear
  end
  if @config.editing_mode_is?(:vi_command) and @cursor > 0 and @cursor == @cursor_max
    byte_size = Reline::Unicode.get_prev_mbchar_size(@line, @byte_pointer)
    @byte_pointer -= byte_size
    mbchar = @line.byteslice(@byte_pointer, byte_size)
    width = Reline::Unicode.get_mbchar_width(mbchar)
    @cursor -= width
  end
end

# File reline/line_editor.rb, line 655
        def padding_space_with_escape_sequences(str, width)
  str + (' ' * (width - calculate_width(str, true)))
end

# File reline/line_editor.rb, line 1687
        def process_auto_indent
  return if not @check_new_auto_indent and @previous_line_index # move cursor up or down
  if @check_new_auto_indent and @previous_line_index and @previous_line_index > 0 and @line_index > @previous_line_index
    # Fix indent of a line when a newline is inserted to the next
    new_lines = whole_lines(index: @previous_line_index, line: @line)
    new_indent = @auto_indent_proc.(new_lines[0..-3].push(''), @line_index - 1, 0, true)
    md = @line.match(/\A */)
    prev_indent = md[0].count(' ')
    @line = ' ' * new_indent + @line.lstrip

    new_indent = nil
    result = @auto_indent_proc.(new_lines[0..-2], @line_index - 1, (new_lines[-2].size + 1), false)
    if result
      new_indent = result
    end
    if new_indent&.>= 0
      @line = ' ' * new_indent + @line.lstrip
    end
  end
  if @previous_line_index
    new_lines = whole_lines(index: @previous_line_index, line: @line)
  else
    new_lines = whole_lines
  end
  new_indent = @auto_indent_proc.(new_lines, @line_index, @byte_pointer, @check_new_auto_indent)
  new_indent = @cursor_max if new_indent&.> @cursor_max
  if new_indent&.>= 0
    md = new_lines[@line_index].match(/\A */)
    prev_indent = md[0].count(' ')
    if @check_new_auto_indent
      @buffer_of_lines[@line_index] = ' ' * new_indent + @buffer_of_lines[@line_index].lstrip
      @cursor = new_indent
      @byte_pointer = new_indent
    else
      @line = ' ' * new_indent + @line.lstrip
      @cursor += new_indent - prev_indent
      @byte_pointer += new_indent - prev_indent
    end
  end
  @check_new_auto_indent = false
end

# File reline/line_editor.rb, line 1968
        def process_insert(force: false)
  return if @continuous_insertion_buffer.empty? or (@in_pasting and not force)
  width = Reline::Unicode.calculate_width(@continuous_insertion_buffer)
  bytesize = @continuous_insertion_buffer.bytesize
  if @cursor == @cursor_max
    @line += @continuous_insertion_buffer
  else
    @line = byteinsert(@line, @byte_pointer, @continuous_insertion_buffer)
  end
  @byte_pointer += bytesize
  @cursor += width
  @cursor_max += width
  @continuous_insertion_buffer.clear
end

# File reline/line_editor.rb, line 1487
        def process_key(key, method_symbol)
  if method_symbol and respond_to?(method_symbol, true)
    method_obj = method(method_symbol)
  else
    method_obj = nil
  end
  if method_symbol and key.is_a?(Symbol)
    if @vi_arg and argumentable?(method_obj)
      run_for_operators(key, method_symbol) do |with_operator|
        wrap_method_call(method_symbol, method_obj, key, with_operator)
      end
    else
      wrap_method_call(method_symbol, method_obj, key) if method_obj
    end
    @kill_ring.process
    if @vi_arg
      @rerender_al = true
      @vi_arg = nil
    end
  elsif @vi_arg
    if key.chr =~ /[0-9]/
      ed_argument_digit(key)
    else
      if argumentable?(method_obj)
        run_for_operators(key, method_symbol) do |with_operator|
          wrap_method_call(method_symbol, method_obj, key, with_operator)
        end
      elsif @waiting_proc
        @waiting_proc.(key)
      elsif method_obj
        wrap_method_call(method_symbol, method_obj, key)
      else
        ed_insert(key) unless @config.editing_mode_is?(:vi_command)
      end
      @kill_ring.process
      if @vi_arg
        @rerender_all = true
        @vi_arg = nil
      end
    end
  elsif @waiting_proc
    @waiting_proc.(key)
    @kill_ring.process
  elsif method_obj
    if method_symbol == :ed_argument_digit
      wrap_method_call(method_symbol, method_obj, key)
    else
      run_for_operators(key, method_symbol) do |with_operator|
        wrap_method_call(method_symbol, method_obj, key, with_operator)
      end
    end
    @kill_ring.process
  else
    ed_insert(key) unless @config.editing_mode_is?(:vi_command)
  end
end