Class: Reline::LineEditor

Inherits:
Object
  • Object
show all
Defined in:
lib/reline/line_editor.rb

Defined Under Namespace

Modules: CompletionState Classes: CompletionJourneyData, MenuInfo

Constant Summary collapse

VI_MOTIONS = 
%i{
  ed_prev_char
  ed_next_char
  vi_zero
  ed_move_to_beg
  ed_move_to_end
  vi_to_column
  vi_next_char
  vi_prev_char
  vi_next_word
  vi_prev_word
  vi_to_next_char
  vi_to_prev_char
  vi_end_word
  vi_next_big_word
  vi_prev_big_word
  vi_end_big_word
  vi_repeat_next_char
  vi_repeat_prev_char
}
PROMPT_LIST_CACHE_TIMEOUT = 
0.5

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, encoding) ⇒ LineEditor

Returns a new instance of LineEditor.



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# File 'lib/reline/line_editor.rb', line 55

def initialize(config, encoding)
  @config = config
  @completion_append_character = ''
  reset_variables(encoding: encoding)
end

Instance Attribute Details

#auto_indent_proc ⇒ Object

Returns the value of attribute auto_indent_proc.



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# File 'lib/reline/line_editor.rb', line 15

def auto_indent_proc
  @auto_indent_proc
end

#byte_pointer ⇒ Object

Returns the value of attribute byte_pointer.



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# File 'lib/reline/line_editor.rb', line 9

def byte_pointer
  @byte_pointer
end

#completion_append_character ⇒ Object

Returns the value of attribute completion_append_character.



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# File 'lib/reline/line_editor.rb', line 12

def completion_append_character
  @completion_append_character
end

#completion_proc ⇒ Object

Returns the value of attribute completion_proc.



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# File 'lib/reline/line_editor.rb', line 11

def completion_proc
  @completion_proc
end

#confirm_multiline_termination_proc ⇒ Object

Returns the value of attribute confirm_multiline_termination_proc.



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# File 'lib/reline/line_editor.rb', line 10

def confirm_multiline_termination_proc
  @confirm_multiline_termination_proc
end

#dig_perfect_match_proc ⇒ Object

Returns the value of attribute dig_perfect_match_proc.



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# File 'lib/reline/line_editor.rb', line 17

def dig_perfect_match_proc
  @dig_perfect_match_proc
end

#line ⇒ Object (readonly)

TODO: undo



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# File 'lib/reline/line_editor.rb', line 8

def line
  @line
end

#output=(value) ⇒ Object (writeonly)

Sets the attribute output

Parameters:

  • value —

    the value to set the attribute output to.



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# File 'lib/reline/line_editor.rb', line 18

def output=(value)
  @output = value
end

#output_modifier_proc ⇒ Object

Returns the value of attribute output_modifier_proc.



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# File 'lib/reline/line_editor.rb', line 13

def output_modifier_proc
  @output_modifier_proc
end

#pre_input_hook ⇒ Object

Returns the value of attribute pre_input_hook.



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# File 'lib/reline/line_editor.rb', line 16

def pre_input_hook
  @pre_input_hook
end

#prompt_proc ⇒ Object

Returns the value of attribute prompt_proc.



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# File 'lib/reline/line_editor.rb', line 14

def prompt_proc
  @prompt_proc
end

Instance Method Details

#call_completion_proc ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 1160

def call_completion_proc
  result = retrieve_completion_block(true)
  preposing, target, postposing = result
  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, preposing)
    when 3..Float::INFINITY
      result = @completion_proc.(target, preposing, postposing)
    end
  end
  Reline.core.instance_variable_set(:@completion_quote_character, nil)
  result
end

#confirm_multiline_termination ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 1309

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

#delete_text(start = nil, length = nil) ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 1331

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

#editing_mode ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 820

def editing_mode
  @config.editing_mode
end

#eof? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/reline/line_editor.rb', line 207

def eof?
  @eof
end

#finalize ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 203

def finalize
  Signal.trap('SIGINT', @old_trap)
end

#finish ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 1420

def finish
  @finished = true
  @rerender_all = true
  @config.reset
end

#finished? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/reline/line_editor.rb', line 1416

def finished?
  @finished
end

#input_key(key) ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 1106

def input_key(key)
  @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
        complete(result)
      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
  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

#insert_text(text) ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 1319

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

#just_move_cursor ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 517

def just_move_cursor
  prompt, prompt_width, prompt_list = check_multiline_prompt(@buffer_of_lines, prompt)
  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

#multiline_off ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 269

def multiline_off
  @is_multiline = false
end

#multiline_on ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 265

def multiline_on
  @is_multiline = true
end

#rerender ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 377

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, prompt)
  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, prompt)
    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
    return
  end
  new_highest_in_this = calculate_height_by_width(prompt_width + calculate_width(@line.nil? ? '' : @line))
  # FIXME: end of logical line sometimes breaks
  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
      @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]
      prompt, prompt_width, prompt_list = check_multiline_prompt(new_lines, prompt)
      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
    elsif not rendered
      unless @in_pasting
        line = modify_lines(whole_lines)[@line_index]
        prompt, prompt_width, prompt_list = check_multiline_prompt(whole_lines, prompt)
        render_partial(prompt, prompt_width, line, @first_line_started_from)
      end
    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

#rerender_all ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 371

def rerender_all
  @rerender_all = true
  process_insert(force: true)
  rerender
end

#reset(prompt = '', encoding:) ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 148

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)
  @old_trap = Signal.trap('SIGINT') {
    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)
    @old_trap.call if @old_trap.respond_to?(:call) # can also be string, ex: "DEFAULT"
    raise Interrupt
  }
  Reline::IOGate.set_winch_handler do
    @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, prompt)
      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
end

#reset_line ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 247

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

#reset_variables(prompt = '', encoding:) ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 211

def reset_variables(prompt = '', encoding:)
  @prompt = prompt
  @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
  reset_line
end

#retrieve_completion_block(set_completion_quote_character = false) ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 1227

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

#set_pasting_state(in_pasting) ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 61

def set_pasting_state(in_pasting)
  @in_pasting = in_pasting
end

#simplified_rendering? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/reline/line_editor.rb', line 65

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

#whole_buffer ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 1404

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

#whole_lines(index: @line_index, line: @line) ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 1398

def whole_lines(index: @line_index, line: @line)
  temp_lines = @buffer_of_lines.dup
  temp_lines[index] = line
  temp_lines
end

#wrap_method_call(method_symbol, method_obj, key, with_operator = false) ⇒ Object 



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# File 'lib/reline/line_editor.rb', line 997

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