class Reline::LineEditor

# File lib/reline/line_editor.rb, line 75
def initialize(config, encoding)
  @config = config
  @completion_append_character = ''
  @screen_size = [0, 0] # Should be initialized with actual winsize in LineEditor#reset
  reset_variables(encoding: encoding)
end

# File lib/reline/line_editor.rb, line 681
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 lib/reline/line_editor.rb, line 1380
def byte_pointer=(val)
  @byte_pointer = val
end

# File lib/reline/line_editor.rb, line 398
def calculate_overlay_levels(overlay_levels)
  levels = []
  overlay_levels.each do |x, w, l|
    levels.fill(l, x, w)
  end
  levels
end

# File lib/reline/line_editor.rb, line 1165
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 lib/reline/line_editor.rb, line 1173
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 lib/reline/line_editor.rb, line 446
def clear_dialogs
  @dialogs.each do |dialog|
    dialog.contents = nil
    dialog.trap_key = nil
  end
end

# File lib/reline/line_editor.rb, line 1319
def confirm_multiline_termination
  temp_buffer = @buffer_of_lines.dup
  @confirm_multiline_termination_proc.(temp_buffer.join("\n") + "\n")
end

# File lib/reline/line_editor.rb, line 304
def current_byte_pointer_cursor
  calculate_width(current_line.byteslice(0, @byte_pointer))
end

# File lib/reline/line_editor.rb, line 1216
def current_line
  @buffer_of_lines[@line_index]
end

# File lib/reline/line_editor.rb, line 1346
def delete_text(start = nil, length = nil)
  if start.nil? and length.nil?
    if @buffer_of_lines.size == 1
      @buffer_of_lines[@line_index] = ''
      @byte_pointer = 0
    elsif @line_index == (@buffer_of_lines.size - 1) and @line_index > 0
      @buffer_of_lines.pop
      @line_index -= 1
      @byte_pointer = 0
    elsif @line_index < (@buffer_of_lines.size - 1)
      @buffer_of_lines.delete_at(@line_index)
      @byte_pointer = 0
    end
  elsif not start.nil? and not length.nil?
    if current_line
      before = current_line.byteslice(0, start)
      after = current_line.byteslice(start + length, current_line.bytesize)
      set_current_line(before + after)
    end
  elsif start.is_a?(Range)
    range = start
    first = range.first
    last = range.last
    last = current_line.bytesize - 1 if last > current_line.bytesize
    last += current_line.bytesize if last < 0
    first += current_line.bytesize if first < 0
    range = range.exclude_end? ? first...last : first..last
    line = current_line.bytes.reject.with_index{ |c, i| range.include?(i) }.map{ |c| c.chr(Encoding::ASCII_8BIT) }.join.force_encoding(@encoding)
    set_current_line(line)
  else
    set_current_line(current_line.byteslice(0, start))
  end
end

# File lib/reline/line_editor.rb, line 888
def dialog_proc_scope_completion_journey_data
  return nil unless @completion_journey_state
  line_index = @completion_journey_state.line_index
  pre_lines = @buffer_of_lines[0...line_index].map { |line| line + "\n" }
  post_lines = @buffer_of_lines[(line_index + 1)..-1].map { |line| line + "\n" }
  DialogProcScope::CompletionJourneyData.new(
    pre_lines.join + @completion_journey_state.pre,
    @completion_journey_state.post + post_lines.join,
    @completion_journey_state.list,
    @completion_journey_state.pointer
  )
end

# File lib/reline/line_editor.rb, line 790
def editing_mode
  @config.editing_mode
end

# File lib/reline/line_editor.rb, line 218
def eof?
  @eof
end

# File lib/reline/line_editor.rb, line 214
def finalize
  Signal.trap('INT', @old_trap)
end

# File lib/reline/line_editor.rb, line 1400
def finish
  @finished = true
  @config.reset
end

# File lib/reline/line_editor.rb, line 1396
def finished?
  @finished
end

# File lib/reline/line_editor.rb, line 166
def handle_signal
  handle_interrupted
  handle_resized
end

# File lib/reline/line_editor.rb, line 1086
def input_key(key)
  save_old_buffer
  @config.reset_oneshot_key_bindings
  @dialogs.each do |dialog|
    if key.char.instance_of?(Symbol) and key.char == dialog.name
      return
    end
  end
  if key.char.nil?
    process_insert(force: true)
    @eof = buffer_empty?
    finish
    return
  end
  @completion_occurs = false

  if key.char.is_a?(Symbol)
    process_key(key.char, key.char)
  else
    normal_char(key)
  end

  @prev_action_state, @next_action_state = @next_action_state, NullActionState

  unless @completion_occurs
    @completion_state = CompletionState::NORMAL
    @completion_journey_state = nil
  end

  push_input_lines unless @undoing
  @undoing = false

  if @in_pasting
    clear_dialogs
    return
  end

  modified = @old_buffer_of_lines != @buffer_of_lines
  if !@completion_occurs && modified && !@config.disable_completion && @config.autocompletion
    # Auto complete starts only when edited
    process_insert(force: true)
    @completion_journey_state = retrieve_completion_journey_state
  end
  modified
end

# File lib/reline/line_editor.rb, line 1324
def insert_multiline_text(text)
  save_old_buffer
  pre = @buffer_of_lines[@line_index].byteslice(0, @byte_pointer)
  post = @buffer_of_lines[@line_index].byteslice(@byte_pointer..)
  lines = (pre + text.gsub(/\r\n?/, "\n") + post).split("\n", -1)
  lines << '' if lines.empty?
  @buffer_of_lines[@line_index, 1] = lines
  @line_index += lines.size - 1
  @byte_pointer = @buffer_of_lines[@line_index].bytesize - post.bytesize
  push_input_lines
end

# File lib/reline/line_editor.rb, line 1336
def insert_text(text)
  if @buffer_of_lines[@line_index].bytesize == @byte_pointer
    @buffer_of_lines[@line_index] += text
  else
    @buffer_of_lines[@line_index] = byteinsert(@buffer_of_lines[@line_index], @byte_pointer, text)
  end
  @byte_pointer += text.bytesize
  process_auto_indent
end

# File lib/reline/line_editor.rb, line 82
def io_gate
  Reline::IOGate
end

# File lib/reline/line_editor.rb, line 1212
def line()
  @buffer_of_lines.join("\n") unless eof?
end

# File lib/reline/line_editor.rb, line 351
def modified_lines
  with_cache(__method__, whole_lines, finished?) do |whole, complete|
    modify_lines(whole, complete)
  end
end

# File lib/reline/line_editor.rb, line 273
def multiline_off
  @is_multiline = false
end

# File lib/reline/line_editor.rb, line 269
def multiline_on
  @is_multiline = true
end

# File lib/reline/line_editor.rb, line 471
def print_nomultiline_prompt
  # Readline's test `TestRelineAsReadline#test_readline` requires first output to be prompt, not cursor reset escape sequence.
  @output.write @prompt if @prompt && !@is_multiline
end

# File lib/reline/line_editor.rb, line 357
def prompt_list
  with_cache(__method__, whole_lines, check_mode_string, @vi_arg, @searching_prompt) do |lines, mode_string|
    check_multiline_prompt(lines, mode_string)
  end
end

# File lib/reline/line_editor.rb, line 1136
def push_input_lines
  if @old_buffer_of_lines == @buffer_of_lines
    @input_lines[@input_lines_position] = [@buffer_of_lines.dup, @byte_pointer, @line_index]
  else
    @input_lines = @input_lines[0..@input_lines_position]
    @input_lines_position += 1
    @input_lines.push([@buffer_of_lines.dup, @byte_pointer, @line_index])
  end
  trim_input_lines
end

# File lib/reline/line_editor.rb, line 476
def render
  wrapped_cursor_x, wrapped_cursor_y = wrapped_cursor_position
  new_lines = wrapped_prompt_and_input_lines.flatten(1)[screen_scroll_top, screen_height].map do |prompt, line|
    prompt_width = Reline::Unicode.calculate_width(prompt, true)
    [[0, prompt_width, prompt], [prompt_width, Reline::Unicode.calculate_width(line, true), line]]
  end
  if @menu_info
    @menu_info.lines(screen_width).each do |item|
      new_lines << [[0, Reline::Unicode.calculate_width(item), item]]
    end
    @menu_info = nil # TODO: do not change state here
  end

  @dialogs.each_with_index do |dialog, index|
    next unless dialog.contents

    x_range, y_range = dialog_range dialog, wrapped_cursor_y - screen_scroll_top
    y_range.each do |row|
      next if row < 0 || row >= screen_height

      dialog_rows = new_lines[row] ||= []
      # index 0 is for prompt, index 1 is for line, index 2.. is for dialog
      dialog_rows[index + 2] = [x_range.begin, dialog.width, dialog.contents[row - y_range.begin]]
    end
  end

  render_differential new_lines, wrapped_cursor_x, wrapped_cursor_y - screen_scroll_top
end

# File lib/reline/line_editor.rb, line 461
def render_finished
  render_differential([], 0, 0)
  lines = @buffer_of_lines.size.times.map do |i|
    line = prompt_list[i] + modified_lines[i]
    wrapped_lines, = split_by_width(line, screen_width)
    wrapped_lines.last.empty? ? "#{line} " : line
  end
  @output.puts lines.map { |l| "#{l}\r\n" }.join
end

# File lib/reline/line_editor.rb, line 406
def render_line_differential(old_items, new_items)
  old_levels = calculate_overlay_levels(old_items.zip(new_items).each_with_index.map {|((x, w, c), (nx, _nw, nc)), i| [x, w, c == nc && x == nx ? i : -1] if x }.compact)
  new_levels = calculate_overlay_levels(new_items.each_with_index.map { |(x, w), i| [x, w, i] if x }.compact).take(screen_width)
  base_x = 0
  new_levels.zip(old_levels).chunk { |n, o| n == o ? :skip : n || :blank }.each do |level, chunk|
    width = chunk.size
    if level == :skip
      # do nothing
    elsif level == :blank
      Reline::IOGate.move_cursor_column base_x
      @output.write "#{Reline::IOGate.reset_color_sequence}#{' ' * width}"
    else
      x, w, content = new_items[level]
      cover_begin = base_x != 0 && new_levels[base_x - 1] == level
      cover_end = new_levels[base_x + width] == level
      pos = 0
      unless x == base_x && w == width
        content, pos = Reline::Unicode.take_mbchar_range(content, base_x - x, width, cover_begin: cover_begin, cover_end: cover_end, padding: true)
      end
      Reline::IOGate.move_cursor_column x + pos
      @output.write "#{Reline::IOGate.reset_color_sequence}#{content}#{Reline::IOGate.reset_color_sequence}"
    end
    base_x += width
  end
  if old_levels.size > new_levels.size
    Reline::IOGate.move_cursor_column new_levels.size
    Reline::IOGate.erase_after_cursor
  end
end

# File lib/reline/line_editor.rb, line 554
def rerender
  render unless @in_pasting
end

# File lib/reline/line_editor.rb, line 139
def reset(prompt = '', encoding:)
  @screen_size = Reline::IOGate.get_screen_size
  reset_variables(prompt, encoding: encoding)
  @rendered_screen.base_y = Reline::IOGate.cursor_pos.y
  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 lib/reline/line_editor.rb, line 260
def reset_line
  @byte_pointer = 0
  @buffer_of_lines = [String.new(encoding: @encoding)]
  @line_index = 0
  @cache.clear
  @line_backup_in_history = nil
  @multibyte_buffer = String.new(encoding: 'ASCII-8BIT')
end

# File lib/reline/line_editor.rb, line 222
def reset_variables(prompt = '', encoding:)
  @prompt = prompt.gsub("\n", "\\n")
  @mark_pointer = nil
  @encoding = encoding
  @is_multiline = false
  @finished = false
  @history_pointer = nil
  @kill_ring ||= Reline::KillRing.new
  @vi_clipboard = ''
  @vi_arg = nil
  @waiting_proc = nil
  @vi_waiting_operator = nil
  @vi_waiting_operator_arg = nil
  @completion_journey_state = nil
  @completion_state = CompletionState::NORMAL
  @perfect_matched = nil
  @menu_info = nil
  @searching_prompt = nil
  @just_cursor_moving = false
  @eof = false
  @continuous_insertion_buffer = String.new(encoding: @encoding)
  @scroll_partial_screen = 0
  @drop_terminate_spaces = false
  @in_pasting = false
  @auto_indent_proc = nil
  @dialogs = []
  @interrupted = false
  @resized = false
  @cache = {}
  @rendered_screen = RenderedScreen.new(base_y: 0, lines: [], cursor_y: 0)
  @input_lines = [[[""], 0, 0]]
  @input_lines_position = 0
  @undoing = false
  @prev_action_state = NullActionState
  @next_action_state = NullActionState
  reset_line
end

# File lib/reline/line_editor.rb, line 550
def rest_height(wrapped_cursor_y)
  screen_height - wrapped_cursor_y + screen_scroll_top - @rendered_screen.base_y - 1
end

# File lib/reline/line_editor.rb, line 1243
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 = current_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 = current_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 = current_line.byteslice(i, @byte_pointer - i)
      break_pointer = i
    else
      i += 1
    end
  end
  postposing = current_line.byteslice(@byte_pointer, current_line.bytesize - @byte_pointer)
  if rest
    preposing = current_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 = current_line.byteslice(0, break_pointer)
    else
      preposing = ''
    end
    target = before
  end
  lines = whole_lines
  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
  [preposing.encode(@encoding), target.encode(@encoding), postposing.encode(@encoding)]
end

# File lib/reline/line_editor.rb, line 1132
def save_old_buffer
  @old_buffer_of_lines = @buffer_of_lines.dup
end

# File lib/reline/line_editor.rb, line 363
def screen_height
  @screen_size.first
end

# File lib/reline/line_editor.rb, line 371
def screen_scroll_top
  @scroll_partial_screen
end

# File lib/reline/line_editor.rb, line 367
def screen_width
  @screen_size.last
end

# File lib/reline/line_editor.rb, line 1155
def scroll_into_view
  _wrapped_cursor_x, wrapped_cursor_y = wrapped_cursor_position
  if wrapped_cursor_y < screen_scroll_top
    @scroll_partial_screen = wrapped_cursor_y
  end
  if wrapped_cursor_y >= screen_scroll_top + screen_height
    @scroll_partial_screen = wrapped_cursor_y - screen_height + 1
  end
end

# File lib/reline/line_editor.rb, line 1220
def set_current_line(line, byte_pointer = nil)
  cursor = current_byte_pointer_cursor
  @buffer_of_lines[@line_index] = line
  if byte_pointer
    @byte_pointer = byte_pointer
  else
    calculate_nearest_cursor(cursor)
  end
  process_auto_indent
end

# File lib/reline/line_editor.rb, line 1231
def set_current_lines(lines, byte_pointer = nil, line_index = 0)
  cursor = current_byte_pointer_cursor
  @buffer_of_lines = lines
  @line_index = line_index
  if byte_pointer
    @byte_pointer = byte_pointer
  else
    calculate_nearest_cursor(cursor)
  end
  process_auto_indent
end

# File lib/reline/line_editor.rb, line 86
def set_pasting_state(in_pasting)
  # While pasting, text to be inserted is stored to @continuous_insertion_buffer.
  # After pasting, this buffer should be force inserted.
  process_insert(force: true) if @in_pasting && !in_pasting
  @in_pasting = in_pasting
end

# File lib/reline/line_editor.rb, line 205
def set_signal_handlers
  Reline::IOGate.set_winch_handler do
    @resized = true
  end
  @old_trap = Signal.trap('INT') do
    @interrupted = true
  end
end

# File lib/reline/line_editor.rb, line 1148
def trim_input_lines
  if @input_lines.size > MAX_INPUT_LINES
    @input_lines.shift
    @input_lines_position -= 1
  end
end

# File lib/reline/line_editor.rb, line 1076
def update(key)
  modified = input_key(key)
  unless @in_pasting
    scroll_into_view
    @just_cursor_moving = !modified
    update_dialogs(key)
    @just_cursor_moving = false
  end
end

# File lib/reline/line_editor.rb, line 453
def update_dialogs(key = nil)
  wrapped_cursor_x, wrapped_cursor_y = wrapped_cursor_position
  @dialogs.each do |dialog|
    dialog.trap_key = nil
    update_each_dialog(dialog, wrapped_cursor_x, wrapped_cursor_y - screen_scroll_top, key)
  end
end

# File lib/reline/line_editor.rb, line 546
def upper_space_height(wrapped_cursor_y)
  wrapped_cursor_y - screen_scroll_top
end

# File lib/reline/line_editor.rb, line 1388
def whole_buffer
  whole_lines.join("\n")
end

# File lib/reline/line_editor.rb, line 1384
def whole_lines
  @buffer_of_lines.dup
end

# File lib/reline/line_editor.rb, line 343
def with_cache(key, *deps)
  cached_deps, value = @cache[key]
  if cached_deps != deps
    @cache[key] = [deps, value = yield(*deps, cached_deps, value)]
  end
  value
end

# File lib/reline/line_editor.rb, line 962
def wrap_method_call(method_symbol, method_obj, key, with_operator = false)
  if @config.editing_mode_is?(:emacs, :vi_insert) and @vi_waiting_operator.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 lib/reline/line_editor.rb, line 437
def wrapped_cursor_position
  prompt_width = calculate_width(prompt_list[@line_index], true)
  line_before_cursor = whole_lines[@line_index].byteslice(0, @byte_pointer)
  wrapped_line_before_cursor = split_by_width(' ' * prompt_width + line_before_cursor, screen_width).first.compact
  wrapped_cursor_y = wrapped_prompt_and_input_lines[0...@line_index].sum(&:size) + wrapped_line_before_cursor.size - 1
  wrapped_cursor_x = calculate_width(wrapped_line_before_cursor.last)
  [wrapped_cursor_x, wrapped_cursor_y]
end

# File lib/reline/line_editor.rb, line 375
def wrapped_prompt_and_input_lines
  with_cache(__method__, @buffer_of_lines.size, modified_lines, prompt_list, screen_width) do |n, lines, prompts, width, prev_cache_key, cached_value|
    prev_n, prev_lines, prev_prompts, prev_width = prev_cache_key
    cached_wraps = {}
    if prev_width == width
      prev_n.times do |i|
        cached_wraps[[prev_prompts[i], prev_lines[i]]] = cached_value[i]
      end
    end

    n.times.map do |i|
      prompt = prompts[i] || ''
      line = lines[i] || ''
      if (cached = cached_wraps[[prompt, line]])
        next cached
      end
      *wrapped_prompts, code_line_prompt = split_by_width(prompt, width).first.compact
      wrapped_lines = split_by_width(line, width, offset: calculate_width(code_line_prompt, true)).first.compact
      wrapped_prompts.map { |p| [p, ''] } + [[code_line_prompt, wrapped_lines.first]] + wrapped_lines.drop(1).map { |c| ['', c] }
    end
  end
end

# File lib/reline/line_editor.rb, line 952
        def argumentable?(method_obj)
  method_obj and method_obj.parameters.any? { |param| param[0] == :key and param[1] == :arg }
end

# File lib/reline/line_editor.rb, line 1392
        def buffer_empty?
  current_line.empty? and @buffer_of_lines.size == 1
end

# File lib/reline/line_editor.rb, line 1411
        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 lib/reline/line_editor.rb, line 1405
        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 lib/reline/line_editor.rb, line 308
        def calculate_nearest_cursor(cursor)
  line_to_calc = current_line
  new_cursor_max = calculate_width(line_to_calc)
  new_cursor = 0
  new_byte_pointer = 0
  height = 1
  max_width = screen_width
  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
  @byte_pointer = new_byte_pointer
end

# File lib/reline/line_editor.rb, line 1418
        def calculate_width(str, allow_escape_code = false)
  Reline::Unicode.calculate_width(str, allow_escape_code)
end

# File lib/reline/line_editor.rb, line 93
        def check_mode_string
  if @config.show_mode_in_prompt
    if @config.editing_mode_is?(:vi_command)
      @config.vi_cmd_mode_string
    elsif @config.editing_mode_is?(:vi_insert)
      @config.vi_ins_mode_string
    elsif @config.editing_mode_is?(:emacs)
      @config.emacs_mode_string
    else
      '?'
    end
  end
end

# File lib/reline/line_editor.rb, line 107
        def check_multiline_prompt(buffer, mode_string)
  if @vi_arg
    prompt = "(arg: #{@vi_arg}) "
  elsif @searching_prompt
    prompt = @searching_prompt
  else
    prompt = @prompt
  end
  if !@is_multiline
    mode_string = check_mode_string
    prompt = mode_string + prompt if mode_string
    [prompt] + [''] * (buffer.size - 1)
  elsif @prompt_proc
    prompt_list = @prompt_proc.(buffer).map { |pr| pr.gsub("\n", "\\n") }
    prompt_list.map!{ prompt } if @vi_arg or @searching_prompt
    prompt_list = [prompt] if prompt_list.empty?
    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_list
  else
    prompt = mode_string + prompt if mode_string
    [prompt] * buffer.size
  end
end

# File lib/reline/line_editor.rb, line 982
        def cleanup_waiting
  @waiting_proc = nil
  @vi_waiting_operator = nil
  @vi_waiting_operator_arg = nil
  @searching_prompt = nil
  @drop_terminate_spaces = false
end

# File lib/reline/line_editor.rb, line 541
        def clear_rendered_screen_cache
  @rendered_screen.lines = []
  @rendered_screen.cursor_y = 0
end

# File lib/reline/line_editor.rb, line 1438
        def complete(_key)
  return if @config.disable_completion

  process_insert(force: true)
  if @config.autocompletion
    @completion_state = CompletionState::NORMAL
    @completion_occurs = move_completed_list(:down)
  else
    @completion_journey_state = nil
    result = call_completion_proc
    if result.is_a?(Array)
      @completion_occurs = true
      perform_completion(result, false)
    end
  end
end

# File lib/reline/line_editor.rb, line 798
        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 lib/reline/line_editor.rb, line 1455
        def completion_journey_move(direction)
  return if @config.disable_completion

  process_insert(force: true)
  @completion_state = CompletionState::NORMAL
  @completion_occurs = move_completed_list(direction)
end

# File lib/reline/line_editor.rb, line 1471
        def completion_journey_up(_key)
  completion_journey_move(:up) if @config.autocompletion
end

# File lib/reline/line_editor.rb, line 2086
        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 lib/reline/line_editor.rb, line 692
        def dialog_range(dialog, dialog_y)
  x_range = dialog.column...dialog.column + dialog.width
  y_range = dialog_y + dialog.vertical_offset...dialog_y + dialog.vertical_offset + dialog.contents.size
  [x_range, y_range]
end

# File lib/reline/line_editor.rb, line 2339
        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 lib/reline/line_editor.rb, line 1966
        def ed_clear_screen(key)
  Reline::IOGate.clear_screen
  @screen_size = Reline::IOGate.get_screen_size
  @rendered_screen.base_y = 0
  clear_rendered_screen_cache
end

# File lib/reline/line_editor.rb, line 2285
        def ed_delete_next_char(key, arg: 1)
  byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
  unless current_line.empty? || byte_size == 0
    line, mbchar = byteslice!(current_line, @byte_pointer, byte_size)
    copy_for_vi(mbchar)
    if @byte_pointer > 0 && current_line.bytesize == @byte_pointer + byte_size
      byte_size = Reline::Unicode.get_prev_mbchar_size(line, @byte_pointer)
      set_current_line(line, @byte_pointer - byte_size)
    else
      set_current_line(line, @byte_pointer)
    end
  end
  arg -= 1
  ed_delete_next_char(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 2197
        def ed_delete_prev_char(key, arg: 1)
  deleted = +''
  arg.times do
    if @byte_pointer > 0
      byte_size = Reline::Unicode.get_prev_mbchar_size(current_line, @byte_pointer)
      @byte_pointer -= byte_size
      line, mbchar = byteslice!(current_line, @byte_pointer, byte_size)
      set_current_line(line)
      deleted.prepend(mbchar)
    end
  end
  copy_for_vi(deleted)
end

# File lib/reline/line_editor.rb, line 2000
        def ed_delete_prev_word(key)
  if @byte_pointer > 0
    byte_size, _ = Reline::Unicode.em_backward_word(current_line, @byte_pointer)
    line, word = byteslice!(current_line, @byte_pointer - byte_size, byte_size)
    set_current_line(line, @byte_pointer - byte_size)
    @kill_ring.append(word, true)
  end
end

# File lib/reline/line_editor.rb, line 1498
        def ed_insert(key)
  if key.instance_of?(String)
    begin
      key.encode(Encoding::UTF_8)
    rescue Encoding::UndefinedConversionError
      return
    end
    str = key
  else
    begin
      key.chr.encode(Encoding::UTF_8)
    rescue Encoding::UndefinedConversionError
      return
    end
    str = key.chr
  end
  if @in_pasting
    @continuous_insertion_buffer << str
    return
  elsif not @continuous_insertion_buffer.empty?
    process_insert
  end

  insert_text(str)
end

# File lib/reline/line_editor.rb, line 1879
        def ed_kill_line(key)
  if current_line.bytesize > @byte_pointer
    line, deleted = byteslice!(current_line, @byte_pointer, current_line.bytesize - @byte_pointer)
    set_current_line(line, line.bytesize)
    @kill_ring.append(deleted)
  elsif @byte_pointer == current_line.bytesize and @buffer_of_lines.size > @line_index + 1
    set_current_line(current_line + @buffer_of_lines.delete_at(@line_index + 1), current_line.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1572
        def ed_move_to_beg(key)
  @byte_pointer = 0
end

# File lib/reline/line_editor.rb, line 1578
        def ed_move_to_end(key)
  @byte_pointer = current_line.bytesize
end

# File lib/reline/line_editor.rb, line 1829
        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?
        @line_index = @buffer_of_lines.size - 1
        @byte_pointer = current_line.bytesize
        finish
      end
    end
  else
    finish
  end
end

# File lib/reline/line_editor.rb, line 1542
        def ed_next_char(key, arg: 1)
  byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
  if (@byte_pointer < current_line.bytesize)
    @byte_pointer += byte_size
  elsif @config.editing_mode_is?(:emacs) and @byte_pointer == current_line.bytesize and @line_index < @buffer_of_lines.size - 1
    @byte_pointer = 0
    @line_index += 1
  end
  arg -= 1
  ed_next_char(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 1812
        def ed_next_history(key, arg: 1)
  if @line_index < (@buffer_of_lines.size - 1)
    cursor = current_byte_pointer_cursor
    @line_index += 1
    calculate_nearest_cursor(cursor)
    return
  end
  move_history(
    (@history_pointer || Reline::HISTORY.size) + 1,
    line: :start,
    cursor: @config.editing_mode_is?(:vi_command) ? :start : :end,
  )
  arg -= 1
  ed_next_history(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 1555
        def ed_prev_char(key, arg: 1)
  if @byte_pointer > 0
    byte_size = Reline::Unicode.get_prev_mbchar_size(current_line, @byte_pointer)
    @byte_pointer -= byte_size
  elsif @config.editing_mode_is?(:emacs) and @byte_pointer == 0 and @line_index > 0
    @line_index -= 1
    @byte_pointer = current_line.bytesize
  end
  arg -= 1
  ed_prev_char(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 1795
        def ed_prev_history(key, arg: 1)
  if @line_index > 0
    cursor = current_byte_pointer_cursor
    @line_index -= 1
    calculate_nearest_cursor(cursor)
    return
  end
  move_history(
    (@history_pointer || Reline::HISTORY.size) - 1,
    line: :end,
    cursor: @config.editing_mode_is?(:vi_command) ? :start : :end,
  )
  arg -= 1
  ed_prev_history(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 1982
        def ed_prev_word(key)
  if @byte_pointer > 0
    byte_size, _ = Reline::Unicode.em_backward_word(current_line, @byte_pointer)
    @byte_pointer -= byte_size
  end
end

# File lib/reline/line_editor.rb, line 1526
        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 lib/reline/line_editor.rb, line 1758
        def ed_search_next_history(key, arg: 1)
  substr = prev_action_state_value(:search_history) == :empty ? '' : current_line.byteslice(0, @byte_pointer)
  return if @history_pointer.nil?

  history_range = @history_pointer + 1...Reline::HISTORY.size
  h_pointer, line_index = search_history(substr, history_range)
  return if h_pointer.nil? and not substr.empty?

  move_history(h_pointer, line: line_index || :start, cursor: substr.empty? ? :end : @byte_pointer)
  arg -= 1
  set_next_action_state(:search_history, :empty) if substr.empty?
  ed_search_next_history(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 1743
        def ed_search_prev_history(key, arg: 1)
  substr = prev_action_state_value(:search_history) == :empty ? '' : current_line.byteslice(0, @byte_pointer)
  return if @history_pointer == 0
  return if @history_pointer.nil? && substr.empty? && !current_line.empty?

  history_range = 0...(@history_pointer || Reline::HISTORY.size)
  h_pointer, line_index = search_history(substr, history_range.reverse_each)
  return unless h_pointer
  move_history(h_pointer, line: line_index || :start, cursor: substr.empty? ? :end : @byte_pointer)
  arg -= 1
  set_next_action_state(:search_history, :empty) if substr.empty?
  ed_search_prev_history(key, arg: arg) if arg > 0
end

# File lib/reline/line_editor.rb, line 2010
        def ed_transpose_chars(key)
  if @byte_pointer > 0
    if @byte_pointer < current_line.bytesize
      byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
      @byte_pointer += byte_size
    end
    back1_byte_size = Reline::Unicode.get_prev_mbchar_size(current_line, @byte_pointer)
    if (@byte_pointer - back1_byte_size) > 0
      back2_byte_size = Reline::Unicode.get_prev_mbchar_size(current_line, @byte_pointer - back1_byte_size)
      back2_pointer = @byte_pointer - back1_byte_size - back2_byte_size
      line, back2_mbchar = byteslice!(current_line, back2_pointer, back2_byte_size)
      set_current_line(byteinsert(line, @byte_pointer - back2_byte_size, back2_mbchar))
    end
  end
end

# File lib/reline/line_editor.rb, line 2027
        def ed_transpose_words(key)
  left_word_start, middle_start, right_word_start, after_start = Reline::Unicode.ed_transpose_words(current_line, @byte_pointer)
  before = current_line.byteslice(0, left_word_start)
  left_word = current_line.byteslice(left_word_start, middle_start - left_word_start)
  middle = current_line.byteslice(middle_start, right_word_start - middle_start)
  right_word = current_line.byteslice(right_word_start, after_start - right_word_start)
  after = current_line.byteslice(after_start, current_line.bytesize - after_start)
  return if left_word.empty? or right_word.empty?
  from_head_to_left_word = before + right_word + middle + left_word
  set_current_line(from_head_to_left_word + after, from_head_to_left_word.bytesize)
end

# File lib/reline/line_editor.rb, line 1477
def ed_unassigned(key) end

# File lib/reline/line_editor.rb, line 2040
        def em_capitol_case(key)
  if current_line.bytesize > @byte_pointer
    byte_size, _, new_str = Reline::Unicode.em_forward_word_with_capitalization(current_line, @byte_pointer)
    before = current_line.byteslice(0, @byte_pointer)
    after = current_line.byteslice((@byte_pointer + byte_size)..-1)
    set_current_line(before + new_str + after, @byte_pointer + new_str.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1923
        def em_delete(key)
  if buffer_empty? and key == "\C-d".ord
    @eof = true
    finish
  elsif @byte_pointer < current_line.bytesize
    splitted_last = current_line.byteslice(@byte_pointer, current_line.bytesize)
    mbchar = splitted_last.grapheme_clusters.first
    line, = byteslice!(current_line, @byte_pointer, mbchar.bytesize)
    set_current_line(line)
  elsif @byte_pointer == current_line.bytesize and @buffer_of_lines.size > @line_index + 1
    set_current_line(current_line + @buffer_of_lines.delete_at(@line_index + 1), current_line.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1990
        def em_delete_next_word(key)
  if current_line.bytesize > @byte_pointer
    byte_size, _ = Reline::Unicode.em_forward_word(current_line, @byte_pointer)
    line, word = byteslice!(current_line, @byte_pointer, byte_size)
    set_current_line(line)
    @kill_ring.append(word)
  end
end

# File lib/reline/line_editor.rb, line 1938
        def em_delete_or_list(key)
  if current_line.empty? or @byte_pointer < current_line.bytesize
    em_delete(key)
  elsif !@config.autocompletion # show completed list
    result = call_completion_proc
    if result.is_a?(Array)
      perform_completion(result, true)
    end
  end
end

# File lib/reline/line_editor.rb, line 1858
        def em_delete_prev_char(key, arg: 1)
  arg.times do
    if @byte_pointer == 0 and @line_index > 0
      @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
    elsif @byte_pointer > 0
      byte_size = Reline::Unicode.get_prev_mbchar_size(current_line, @byte_pointer)
      line, = byteslice!(current_line, @byte_pointer - byte_size, byte_size)
      set_current_line(line, @byte_pointer - byte_size)
    end
  end
  process_auto_indent
end

# File lib/reline/line_editor.rb, line 2501
        def em_exchange_mark(key)
  return unless @mark_pointer
  new_pointer = [@byte_pointer, @line_index]
  @byte_pointer, @line_index = @mark_pointer
  @mark_pointer = new_pointer
end

# File lib/reline/line_editor.rb, line 1915
        def em_kill_line(key)
  if current_line.size > 0
    @kill_ring.append(current_line.dup, true)
    set_current_line('', 0)
  end
end

# File lib/reline/line_editor.rb, line 2076
        def em_kill_region(key)
  if @byte_pointer > 0
    byte_size, _ = Reline::Unicode.em_big_backward_word(current_line, @byte_pointer)
    line, deleted = byteslice!(current_line, @byte_pointer - byte_size, byte_size)
    set_current_line(line, @byte_pointer - byte_size)
    @kill_ring.append(deleted, true)
  end
end

# File lib/reline/line_editor.rb, line 2050
        def em_lower_case(key)
  if current_line.bytesize > @byte_pointer
    byte_size, = Reline::Unicode.em_forward_word(current_line, @byte_pointer)
    part = current_line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { |mbchar|
      mbchar =~ /[A-Z]/ ? mbchar.downcase : mbchar
    }.join
    rest = current_line.byteslice((@byte_pointer + byte_size)..-1)
    line = current_line.byteslice(0, @byte_pointer) + part
    set_current_line(line + rest, line.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1974
        def em_next_word(key)
  if current_line.bytesize > @byte_pointer
    byte_size, _ = Reline::Unicode.em_forward_word(current_line, @byte_pointer)
    @byte_pointer += byte_size
  end
end

# File lib/reline/line_editor.rb, line 2496
        def em_set_mark(key)
  @mark_pointer = [@byte_pointer, @line_index]
end

# File lib/reline/line_editor.rb, line 2063
        def em_upper_case(key)
  if current_line.bytesize > @byte_pointer
    byte_size, = Reline::Unicode.em_forward_word(current_line, @byte_pointer)
    part = current_line.byteslice(@byte_pointer, byte_size).grapheme_clusters.map { |mbchar|
      mbchar =~ /[a-z]/ ? mbchar.upcase : mbchar
    }.join
    rest = current_line.byteslice((@byte_pointer + byte_size)..-1)
    line = current_line.byteslice(0, @byte_pointer) + part
    set_current_line(line + rest, line.bytesize)
  end
end

# File lib/reline/line_editor.rb, line 1950
        def em_yank(key)
  yanked = @kill_ring.yank
  insert_text(yanked) if yanked
end

# File lib/reline/line_editor.rb, line 1956
        def em_yank_pop(key)
  yanked, prev_yank = @kill_ring.yank_pop
  if yanked
    line, = byteslice!(current_line, @byte_pointer - prev_yank.bytesize, prev_yank.bytesize)
    set_current_line(line, @byte_pointer - prev_yank.bytesize)
    insert_text(yanked)
  end
end

# File lib/reline/line_editor.rb, line 2509
        def emacs_editing_mode(key)
  @config.editing_mode = :emacs
end

# File lib/reline/line_editor.rb, line 1583
        def generate_searcher(search_key)
  search_word = String.new(encoding: @encoding)
  multibyte_buf = String.new(encoding: 'ASCII-8BIT')
  hit_pointer = nil
  lambda do |key|
    search_again = false
    case key
    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 search_key == key
      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)
      hit_pointer = Reline::HISTORY.size
      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 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 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 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
        hit_pointer = history_pointer_base + hit_index
        hit = Reline::HISTORY[hit_pointer]
      end
    end
    case search_key
    when "\C-r".ord
      prompt_name = 'reverse-i-search'
    when "\C-s".ord
      prompt_name = 'i-search'
    end
    prompt_name = "failed #{prompt_name}" unless hit
    [search_word, prompt_name, hit_pointer]
  end
end

# File lib/reline/line_editor.rb, line 183
        def handle_interrupted
  return unless @interrupted

  @interrupted = false
  clear_dialogs
  render
  cursor_to_bottom_offset = @rendered_screen.lines.size - @rendered_screen.cursor_y
  Reline::IOGate.scroll_down cursor_to_bottom_offset
  Reline::IOGate.move_cursor_column 0
  clear_rendered_screen_cache
  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
end

# File lib/reline/line_editor.rb, line 171
        def handle_resized
  return unless @resized

  @screen_size = Reline::IOGate.get_screen_size
  @resized = false
  scroll_into_view
  Reline::IOGate.move_cursor_up @rendered_screen.cursor_y
  @rendered_screen.base_y = Reline::IOGate.cursor_pos.y
  clear_rendered_screen_cache
  render
end

# File lib/reline/line_editor.rb, line 956
        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 lib/reline/line_editor.rb, line 1667
        def incremental_search_history(key)
  unless @history_pointer
    @line_backup_in_history = whole_buffer
  end
  searcher = generate_searcher(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
      @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
      @searching_prompt = nil
      @waiting_proc = nil
      @byte_pointer = 0
    when "\C-g".ord
      @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
      move_history(nil, line: :end, cursor: :end, save_buffer: false)
      @searching_prompt = nil
      @waiting_proc = nil
      @byte_pointer = 0
    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
        search_word, prompt_name, hit_pointer = searcher.call(k)
        Reline.last_incremental_search = search_word
        @searching_prompt = "(%s)`%s'" % [prompt_name, search_word]
        @searching_prompt += ': ' unless @is_multiline
        move_history(hit_pointer, line: :end, cursor: :end, save_buffer: false) if hit_pointer
      else
        if @history_pointer
          line = Reline::HISTORY[@history_pointer]
        else
          line = @line_backup_in_history
        end
        @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
        @searching_prompt = nil
        @waiting_proc = nil
        @byte_pointer = 0
      end
    end
  }
end

# File lib/reline/line_editor.rb, line 277
        def insert_new_line(cursor_line, next_line)
  @buffer_of_lines.insert(@line_index + 1, String.new(next_line, encoding: @encoding))
  @buffer_of_lines[@line_index] = cursor_line
  @line_index += 1
  @byte_pointer = 0
  if @auto_indent_proc && !@in_pasting
    if next_line.empty?
      (
        # For compatibility, use this calculation instead of just `process_auto_indent @line_index - 1, cursor_dependent: false`
        indent1 = @auto_indent_proc.(@buffer_of_lines.take(@line_index - 1).push(''), @line_index - 1, 0, true)
        indent2 = @auto_indent_proc.(@buffer_of_lines.take(@line_index), @line_index - 1, @buffer_of_lines[@line_index - 1].bytesize, false)
        indent = indent2 || indent1
        @buffer_of_lines[@line_index - 1] = ' ' * indent + @buffer_of_lines[@line_index - 1].gsub(/\A\s*/, '')
      )
      process_auto_indent @line_index, add_newline: true
    else
      process_auto_indent @line_index - 1, cursor_dependent: false
      process_auto_indent @line_index, add_newline: true # Need for compatibility
      process_auto_indent @line_index, cursor_dependent: false
    end
  end
end

# File lib/reline/line_editor.rb, line 1422
        def key_delete(key)
  if @config.editing_mode_is?(:vi_insert)
    ed_delete_next_char(key)
  elsif @config.editing_mode_is?(:emacs)
    em_delete(key)
  end
end

# File lib/reline/line_editor.rb, line 1430
        def key_newline(key)
  if @is_multiline
    next_line = current_line.byteslice(@byte_pointer, current_line.bytesize - @byte_pointer)
    cursor_line = current_line.byteslice(0, @byte_pointer)
    insert_new_line(cursor_line, next_line)
  end
end

# File lib/reline/line_editor.rb, line 794
        def menu(_target, list)
  @menu_info = MenuInfo.new(list)
end

# File lib/reline/line_editor.rb, line 1463
        def menu_complete(_key)
  completion_journey_move(:down)
end

# File lib/reline/line_editor.rb, line 1467
        def menu_complete_backward(_key)
  completion_journey_move(:up)
end

# File lib/reline/line_editor.rb, line 782
        def modify_lines(before, complete)
  if after = @output_modifier_proc&.call("#{before.join("\n")}\n", complete: complete)
    after.lines("\n").map { |l| l.chomp('') }
  else
    before.map { |l| Reline::Unicode.escape_for_print(l) }
  end
end

# File lib/reline/line_editor.rb, line 901
        def move_completed_list(direction)
  @completion_journey_state ||= retrieve_completion_journey_state
  return false unless @completion_journey_state

  if (delta = { up: -1, down: +1 }[direction])
    @completion_journey_state.pointer = (@completion_journey_state.pointer + delta) % @completion_journey_state.list.size
  end
  completed = @completion_journey_state.list[@completion_journey_state.pointer]
  set_current_line(@completion_journey_state.pre + completed + @completion_journey_state.post, @completion_journey_state.pre.bytesize + completed.bytesize)
  true
end

# File lib/reline/line_editor.rb, line 1773
        def move_history(history_pointer, line:, cursor:, save_buffer: true)
  history_pointer ||= Reline::HISTORY.size
  return if history_pointer < 0 || history_pointer > Reline::HISTORY.size
  old_history_pointer = @history_pointer || Reline::HISTORY.size
  if old_history_pointer == Reline::HISTORY.size
    @line_backup_in_history = save_buffer ? whole_buffer : ''
  else
    Reline::HISTORY[old_history_pointer] = whole_buffer if save_buffer
  end
  if history_pointer == Reline::HISTORY.size
    buf = @line_backup_in_history
    @history_pointer = @line_backup_in_history = nil
  else
    buf = Reline::HISTORY[history_pointer]
    @history_pointer = history_pointer
  end
  @buffer_of_lines = buf.split("\n")
  @buffer_of_lines = [String.new(encoding: @encoding)] if @buffer_of_lines.empty?
  @line_index = line == :start ? 0 : line == :end ? @buffer_of_lines.size - 1 : line
  @byte_pointer = cursor == :start ? 0 : cursor == :end ? current_line.bytesize : cursor
end

# File lib/reline/line_editor.rb, line 1054
        def normal_char(key)
  @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)
    process_key(key.combined_char, method_symbol)
    @multibyte_buffer.clear
  end
  if @config.editing_mode_is?(:vi_command) and @byte_pointer > 0 and @byte_pointer == current_line.bytesize
    byte_size = Reline::Unicode.get_prev_mbchar_size(@buffer_of_lines[@line_index], @byte_pointer)
    @byte_pointer -= byte_size
  end
end

# File lib/reline/line_editor.rb, line 844
        def perform_completion(list, just_show_list)
  case @completion_state
  when CompletionState::NORMAL
    @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
        perform_completion(list, true) if @config.show_all_if_ambiguous
      end
      @perfect_matched = completed
    else
      @completion_state = CompletionState::MENU
      perform_completion(list, true) if @config.show_all_if_ambiguous
    end
    if not just_show_list and target < completed
      @buffer_of_lines[@line_index] = (preposing + completed + completion_append_character.to_s + postposing).split("\n")[@line_index] || String.new(encoding: @encoding)
      line_to_pointer = (preposing + completed + completion_append_character.to_s).split("\n")[@line_index] || String.new(encoding: @encoding)
      @byte_pointer = line_to_pointer.bytesize
    end
  end
end

# File lib/reline/line_editor.rb, line 2537
        def prev_action_state_value(type)
  @prev_action_state[0] == type ? @prev_action_state[1] : nil
end

# File lib/reline/line_editor.rb, line 1195
        def process_auto_indent(line_index = @line_index, cursor_dependent: true, add_newline: false)
  return if @in_pasting
  return unless @auto_indent_proc

  line = @buffer_of_lines[line_index]
  byte_pointer = cursor_dependent && @line_index == line_index ? @byte_pointer : line.bytesize
  new_indent = @auto_indent_proc.(@buffer_of_lines.take(line_index + 1).push(''), line_index, byte_pointer, add_newline)
  return unless new_indent

  new_line = ' ' * new_indent + line.lstrip
  @buffer_of_lines[line_index] = new_line
  if @line_index == line_index
    indent_diff = new_line.bytesize - line.bytesize
    @byte_pointer = [@byte_pointer + indent_diff, 0].max
  end
end

# File lib/reline/line_editor.rb, line 1479
        def process_insert(force: false)
  return if @continuous_insertion_buffer.empty? or (@in_pasting and not force)
  insert_text(@continuous_insertion_buffer)
  @continuous_insertion_buffer.clear
end

# File lib/reline/line_editor.rb, line 990
        def process_key(key, method_symbol)
  if key.is_a?(Symbol)
    cleanup_waiting
  elsif @waiting_proc
    old_byte_pointer = @byte_pointer
    @waiting_proc.call(key)
    if @vi_waiting_operator
      byte_pointer_diff = @byte_pointer - old_byte_pointer
      @byte_pointer = old_byte_pointer
      method_obj = method(@vi_waiting_operator)
      wrap_method_call(@vi_waiting_operator, method_obj, byte_pointer_diff)
      cleanup_waiting
    end
    @kill_ring.process
    return
  end

  if method_symbol and respond_to?(method_symbol, true)
    method_obj = method(method_symbol)
  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
      @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 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
        @vi_arg = nil
      end
    end
  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

# File lib/reline/line_editor.rb, line 2545
        def re_read_init_file(_key)
  @config.reload
end

# File lib/reline/line_editor.rb, line 2527
        def redo(_key)
  @undoing = true

  return if @input_lines_position >= @input_lines.size - 1

  @input_lines_position += 1
  target_lines, target_cursor_x, target_cursor_y = @input_lines[@input_lines_position]
  set_current_lines(target_lines.dup, target_cursor_x, target_cursor_y)
end

# File lib/reline/line_editor.rb, line 508
        def render_differential(new_lines, new_cursor_x, new_cursor_y)
  rendered_lines = @rendered_screen.lines
  cursor_y = @rendered_screen.cursor_y
  if new_lines != rendered_lines
    # Hide cursor while rendering to avoid cursor flickering.
    Reline::IOGate.hide_cursor
    num_lines = [[new_lines.size, rendered_lines.size].max, screen_height].min
    if @rendered_screen.base_y + num_lines > screen_height
      Reline::IOGate.scroll_down(num_lines - cursor_y - 1)
      @rendered_screen.base_y = screen_height - num_lines
      cursor_y = num_lines - 1
    end
    num_lines.times do |i|
      rendered_line = rendered_lines[i] || []
      line_to_render = new_lines[i] || []
      next if rendered_line == line_to_render

      Reline::IOGate.move_cursor_down i - cursor_y
      cursor_y = i
      unless rendered_lines[i]
        Reline::IOGate.move_cursor_column 0
        Reline::IOGate.erase_after_cursor
      end
      render_line_differential(rendered_line, line_to_render)
    end
    @rendered_screen.lines = new_lines
    Reline::IOGate.show_cursor
  end
  Reline::IOGate.move_cursor_column new_cursor_x
  Reline::IOGate.move_cursor_down new_cursor_y - cursor_y
  @rendered_screen.cursor_y = new_cursor_y
end

# File lib/reline/line_editor.rb, line 913
        def retrieve_completion_journey_state
  preposing, target, postposing = retrieve_completion_block
  list = call_completion_proc
  return unless list.is_a?(Array)

  candidates = list.select{ |item| item.start_with?(target) }
  return if candidates.empty?

  pre = preposing.split("\n", -1).last || ''
  post = postposing.split("\n", -1).first || ''
  CompletionJourneyState.new(
    @line_index, pre, target, post, [target] + candidates, 0
  )
end

# File lib/reline/line_editor.rb, line 928
        def run_for_operators(key, method_symbol, &block)
  if @vi_waiting_operator
    if VI_MOTIONS.include?(method_symbol)
      old_byte_pointer = @byte_pointer
      @vi_arg = (@vi_arg || 1) * @vi_waiting_operator_arg
      block.(true)
      unless @waiting_proc
        byte_pointer_diff = @byte_pointer - old_byte_pointer
        @byte_pointer = old_byte_pointer
        method_obj = method(@vi_waiting_operator)
        wrap_method_call(@vi_waiting_operator, method_obj, byte_pointer_diff)
        cleanup_waiting
      end
    else
      # Ignores operator when not motion is given.
      block.(false)
      cleanup_waiting
    end
    @vi_arg = nil
  else
    block.(false)
  end
end

# File lib/reline/line_editor.rb, line 1733
        def search_history(prefix, pointer_range)
  pointer_range.each do |pointer|
    lines = Reline::HISTORY[pointer].split("\n")
    lines.each_with_index do |line, index|
      return [pointer, index] if line.start_with?(prefix)
    end
  end
  nil
end

# File lib/reline/line_editor.rb, line 2397
        def search_next_char(key, arg, need_prev_char: false, inclusive: false)
  if key.instance_of?(String)
    inputed_char = key
  else
    inputed_char = key.chr
  end
  prev_total = nil
  total = nil
  found = false
  current_line.byteslice(@byte_pointer..-1).grapheme_clusters.each do |mbchar|
    # total has [byte_size, cursor]
    unless total
      # skip cursor point
      width = Reline::Unicode.get_mbchar_width(mbchar)
      total = [mbchar.bytesize, width]
    else
      if inputed_char == mbchar
        arg -= 1
        if arg.zero?
          found = true
          break
        end
      end
      width = Reline::Unicode.get_mbchar_width(mbchar)
      prev_total = total
      total = [total.first + mbchar.bytesize, total.last + width]
    end
  end
  if not need_prev_char and found and total
    byte_size, _ = total
    @byte_pointer += byte_size
  elsif need_prev_char and found and prev_total
    byte_size, _ = prev_total
    @byte_pointer += byte_size
  end
  if inclusive
    byte_size = Reline::Unicode.get_next_mbchar_size(current_line, @byte_pointer)
    if byte_size > 0
      @byte_pointer += byte_size
    end
  end
  @waiting_proc = nil
end

# File lib/reline/line_editor.rb, line 2449
        def search_prev_char(key, arg, need_next_char = false)
  if key.instance_of?(String)
    inputed_char = key
  else
    inputed_char = key.chr
  end
  prev_total = nil
  total = nil
  found = false
  current_line.byteslice(0..@byte_pointer).grapheme_clusters.reverse_each do |mbchar|
    # total has [byte_size, cursor]
    unless total
      # skip cursor point
      width = Reline::Unicode.get_mbchar_width(mbchar)
      total = [mbchar.bytesize, width]
    else
      if inputed_char == mbchar
        arg -= 1
        if arg.zero?
          found = true
          break
        end
      end
      width = Reline::Unicode.get_mbchar_width(mbchar)
      prev_total = total
      total = [total.first + mbchar.bytesize, total.last + width]
    end
  end
  if not need_next_char and found and total
    byte_size, _ = total
    @byte_pointer -= byte_size
  elsif need_next_char and found and prev_total
    byte_size, _ = prev_total
    @byte_pointer -= byte_size
  end
  @waiting_proc = nil
end

# File lib/reline/line_editor.rb, line 2541
        def set_next_action_state(type, value)
  @next_action_state = [type, value]
end

# File lib/reline/line_editor.rb, line 300
        def split_by_width(str, max_width, offset: 0)
  Reline::Unicode.split_by_width(str, max_width, @encoding, offset: offset)
end

# File lib/reline/line_editor.rb, line 2517
        def undo(_key)
  @undoing = true

  return if @input_lines_position <= 0

  @input_lines_position -= 1
  target_lines, target_cursor_x, target_cursor_y = @input_lines[@input_lines_position]
  set_current_lines(target_lines.dup, target_cursor_x, target_cursor_y)
end

# File lib/reline/line_editor.rb, line 698
        def update_each_dialog(dialog, cursor_column, cursor_row, key = nil)
  dialog.set_cursor_pos(cursor_column, cursor_row)
  dialog_render_info = dialog.call(key)
  if dialog_render_info.nil? or dialog_render_info.contents.nil? or dialog_render_info.contents.empty?
    dialog.contents = nil
    dialog.trap_key = nil
    return
  end
  contents = dialog_render_info.contents
  pointer = dialog.pointer
  if dialog_render_info.width
    dialog.width = dialog_render_info.width
  else
    dialog.width = contents.map { |l| calculate_width(l, true) }.max
  end
  height = dialog_render_info.height || DIALOG_DEFAULT_HEIGHT
  height = contents.size if contents.size < height
  if contents.size > height
    if dialog.pointer
      if dialog.pointer < 0
        dialog.scroll_top = 0
      elsif (dialog.pointer - dialog.scroll_top) >= (height - 1)
        dialog.scroll_top = dialog.pointer - (height - 1)
      elsif (dialog.pointer - dialog.scroll_top) < 0
        dialog.scroll_top = dialog.pointer
      end
      pointer = dialog.pointer - dialog.scroll_top
    else
      dialog.scroll_top = 0
    end
    contents = contents[dialog.scroll_top, height]
  end
  if dialog_render_info.scrollbar and dialog_render_info.contents.size > height
    bar_max_height = height * 2
    moving_distance = (dialog_render_info.contents.size - height) * 2
    position_ratio = dialog.scroll_top.zero? ? 0.0 : ((dialog.scroll_top * 2).to_f / moving_distance)
    bar_height = (bar_max_height * ((contents.size * 2).to_f / (dialog_render_info.contents.size * 2))).floor.to_i
    bar_height = MINIMUM_SCROLLBAR_HEIGHT if bar_height < MINIMUM_SCROLLBAR_HEIGHT
    scrollbar_pos = ((bar_max_height - bar_height) * position_ratio).floor.to_i
  else
    scrollbar_pos = nil
  end
  dialog.column = dialog_render_info.pos.x
  dialog.width += @block_elem_width if scrollbar_pos
  diff = (dialog.column + dialog.width) - screen_width
  if diff > 0
    dialog.column -= diff
  end
  if rest_height(screen_scroll_top + cursor_row) - dialog_render_info.pos.y >= height
    dialog.vertical_offset = dialog_render_info.pos.y + 1
  elsif cursor_row >= height
    dialog.vertical_offset = dialog_render_info.pos.y - height
  else
    dialog.vertical_offset = dialog_render_info.pos.y + 1
  end
  if dialog.column < 0
    dialog.column = 0
    dialog.width = screen_width
  end
  face = Reline::Face[dialog_render_info.face || :default]
  scrollbar_sgr = face[:scrollbar]
  default_sgr = face[:default]
  enhanced_sgr = face[:enhanced]
  dialog.contents = contents.map.with_index do |item, i|
    line_sgr = i == pointer ? enhanced_sgr : default_sgr
    str_width = dialog.width - (scrollbar_pos.nil? ? 0 : @block_elem_width)
    str, = Reline::Unicode.take_mbchar_range(item, 0, str_width, padding: true)
    colored_content = "#{line_sgr}#{str}"
    if scrollbar_pos
      if scrollbar_pos <= (i * 2) and (i * 2 + 1) < (scrollbar_pos + bar_height)
        colored_content + scrollbar_sgr + @full_block
      elsif scrollbar_pos <= (i * 2) and (i * 2) < (scrollbar_pos + bar_height)
        colored_content + scrollbar_sgr + @upper_half_block
      elsif scrollbar_pos <= (i * 2 + 1) and (i * 2) < (scrollbar_pos + bar_height)
        colored_content + scrollbar_sgr + @lower_half_block
      else
        colored_content + scrollbar_sgr + ' ' * @block_elem_width
      end
    else
      colored_content
    end
  end
end