Class: Textbringer::Buffer

Inherits:
Object
  • Object
show all
Extended by:
Enumerable
Defined in:
lib/textbringer/buffer.rb

Constant Summary collapse

GAP_SIZE = 
256
UNDO_LIMIT = 
1000
UTF8_CHAR_LEN = 
Hash.new(1)
DEFAULT_DETECT_ENCODING = 
->(s) {
  @@auto_detect_encodings.find { |e|
    s.force_encoding(e)
    s.valid_encoding?
  }
}
NKF_DETECT_ENCODING = 
->(s) {
  e = NKF.guess(s)
  case e
  when Encoding::US_ASCII
    Encoding::UTF_8
  when Encoding::ASCII_8BIT
    s.force_encoding(Encoding::UTF_8)
    if s.valid_encoding?
      Encoding::UTF_8
    else
      s.force_encoding(Encoding::ASCII_8BIT)
      Encoding::ASCII_8BIT
    end
  else
    e
  end
}
@@auto_detect_encodings = 
[
  Encoding::UTF_8,
  Encoding::EUC_JP,
  Encoding::Windows_31J
]
@@detect_encoding_proc = 
DEFAULT_DETECT_ENCODING
@@table = 
{}
@@list = 
[]
@@current = 
nil
@@minibuffer = 
nil
@@global_mark_ring = 
nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(s = +"",, name: nil, file_name: nil, file_encoding: , file_mtime: nil, new_file: true, undo_limit: UNDO_LIMIT, read_only: false) ⇒ Buffer

s might not be copied.



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# File 'lib/textbringer/buffer.rb', line 206

def initialize(s = +"", name: nil,
               file_name: nil,
               file_encoding: CONFIG[:default_file_encoding],
               file_mtime: nil, new_file: true, undo_limit: UNDO_LIMIT,
               read_only: false)
  set_contents(s, file_encoding)
  @name = name
  @file_name = file_name
  self.file_encoding = file_encoding
  @file_mtime = file_mtime
  @new_file = new_file
  @undo_limit = undo_limit
  @point = 0
  @gap_start = 0
  @gap_end = 0
  @marks = []
  @mark = nil
  @mark_ring = Ring.new(CONFIG[:mark_ring_max],
                        on_delete: ->(mark) { mark.delete })
  @current_line = 1
  @current_column = 1  # One-based character count
  @goal_column = nil   # Zero-based display width count
  @undo_stack = []
  @redo_stack = []
  @undoing = false
  @composite_edit_level = 0
  @composite_edit_actions = []
  @version = 0
  @modified = false
  @mode = FundamentalMode.new(self)
  @keymap = nil
  @attributes = {}
  @save_point_level = 0
  @match_offsets = []
  @visible_mark = nil
  @read_only = read_only
  @callbacks = {}
end

Instance Attribute Details

#current_column ⇒ Object (readonly)

Returns the value of attribute current_column.



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# File 'lib/textbringer/buffer.rb', line 13

def current_column
  @current_column
end

#current_line ⇒ Object (readonly)

Returns the value of attribute current_line.



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# File 'lib/textbringer/buffer.rb', line 13

def current_line
  @current_line
end

#file_encoding ⇒ Object

Returns the value of attribute file_encoding.



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# File 'lib/textbringer/buffer.rb', line 12

def file_encoding
  @file_encoding
end

#file_format ⇒ Object

Returns the value of attribute file_format.



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# File 'lib/textbringer/buffer.rb', line 12

def file_format
  @file_format
end

#file_name ⇒ Object

Returns the value of attribute file_name.



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# File 'lib/textbringer/buffer.rb', line 12

def file_name
  @file_name
end

#keymap ⇒ Object

Returns the value of attribute keymap.



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# File 'lib/textbringer/buffer.rb', line 11

def keymap
  @keymap
end

#marks ⇒ Object (readonly)

Returns the value of attribute marks.



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# File 'lib/textbringer/buffer.rb', line 12

def marks
  @marks
end

#mode ⇒ Object

Returns the value of attribute mode.



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# File 'lib/textbringer/buffer.rb', line 11

def mode
  @mode
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/textbringer/buffer.rb', line 12

def name
  @name
end

#point ⇒ Object (readonly)

Returns the value of attribute point.



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# File 'lib/textbringer/buffer.rb', line 12

def point
  @point
end

#visible_mark ⇒ Object (readonly)

Returns the value of attribute visible_mark.



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# File 'lib/textbringer/buffer.rb', line 13

def visible_mark
  @visible_mark
end

Class Method Details

.[](name) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 133

def self.[](name)
  @@table[name]
end

.add(buffer) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 90

def self.add(buffer)
  @@table[buffer.name] = buffer
  @@list.push(buffer)
end

.auto_detect_encodings ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 70

def self.auto_detect_encodings
  @@auto_detect_encodings
end

.auto_detect_encodings=(encodings) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 74

def self.auto_detect_encodings=(encodings)
  @@auto_detect_encodings = encodings
end

.bury(buffer = @@current) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 123

def self.bury(buffer = @@current)
  @@list.delete(buffer)
  @@list.push(buffer)
  @@current = @@list.first
end

.count ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 129

def self.count
  @@table.size
end

.current ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 95

def self.current
  @@current
end

.current=(buffer) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 99

def self.current=(buffer)
  if buffer && buffer.name && @@table.key?(buffer.name)
    @@list.delete(buffer)
    @@list.unshift(buffer)
  end
  @@current = buffer
end

.detect_encoding_proc ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 78

def self.detect_encoding_proc
  @@detect_encoding_proc
end

.detect_encoding_proc=(f) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 82

def self.detect_encoding_proc=(f)
  @@detect_encoding_proc = f
end

.display_width(s) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 188

def self.display_width(s)
  Unicode::DisplayWidth.of(s, CONFIG[:east_asian_ambiguous_width])
end

.dump_unsaved_buffers(dir) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1308

def self.dump_unsaved_buffers(dir)
  FileUtils.mkdir_p(dir)
  @@list.each do |buffer|
    if /\A\*/ !~ buffer.name && buffer.modified?
      buffer.dump(File.expand_path(buffer.object_id.to_s, dir))
    end
  end
end

.dumped_buffers_exist?(dir) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 1317

def self.dumped_buffers_exist?(dir)
  !Dir.glob(File.expand_path("*.metadata", dir)).empty?
end

.each(&block) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 184

def self.each(&block)
  @@list.each(&block)
end

.find_file(file_name) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 151

def self.find_file(file_name)
  file_name = File.expand_path(file_name)
  buffer = @@table.each_value.find { |b|
    b.file_name == file_name
  }
  if buffer.nil?
    name = File.basename(file_name)
    begin
      buffer = Buffer.open(file_name, name: new_buffer_name(name))
      add(buffer)
    rescue Errno::ENOENT
      buffer = new_buffer(name, file_name: file_name)
    end
  end
  buffer
end

.find_or_new(name, **opts) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 137

def self.find_or_new(name, **opts)
  @@table[name] ||= new_buffer(name, **opts)
end

.global_mark_ring ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 111

def self.global_mark_ring
  @@global_mark_ring ||= Ring.new(CONFIG[:global_mark_ring_max])
end

.kill_em_all ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 145

def self.kill_em_all
  @@table.clear
  @@list.clear
  @@current = nil
end

.last ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 119

def self.last
  @@list.last
end

.list ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 86

def self.list
  @@list.dup
end

.load(path) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1297

def self.load(path)
  buffer = Buffer.new(File.binread(path))
  metadata = JSON.parse(File.binread(path + ".metadata"))
  buffer.name = metadata["name"]
  buffer.file_name = metadata["file_name"] if metadata["file_name"]
  buffer.file_encoding = Encoding.find(metadata["file_encoding"])
  buffer.file_format = metadata["file_format"].intern
  buffer.modified = true
  buffer
end

.load_dumped_buffers(dir) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1321

def self.load_dumped_buffers(dir)
  Dir.glob(File.expand_path("*.metadata", dir)).map do |metadata_path|
    path = metadata_path.sub(/\.metadata\z/, "")
    buffer = Buffer.load(path)
    add(buffer)
    File.unlink(metadata_path)
    File.unlink(path)
    buffer
  end
end

.minibuffer ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 107

def self.minibuffer
  @@minibuffer ||= Buffer.new(name: "*Minibuffer*")
end

.names ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 141

def self.names
  @@table.keys
end

.new_buffer(name, **opts) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 168

def self.new_buffer(name, **opts)
  buffer = Buffer.new(**opts.merge(name: new_buffer_name(name)))
  add(buffer)
  buffer
end

.new_buffer_name(name) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 174

def self.new_buffer_name(name)
  if @@table.key?(name)
    (2..Float::INFINITY).lazy.map { |i|
      "#{name}<#{i}>"
    }.find { |i| !@@table.key?(i) }
  else
    name
  end
end

.open(file_name, name: File.basename(file_name)) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 365

def self.open(file_name, name: File.basename(file_name))
  buffer = Buffer.new(name: name,
                      file_name: file_name, new_file: false)
  buffer.revert
  buffer.read_only = !File.writable?(file_name)
  buffer
end

.other(buffer = @@current) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 115

def self.other(buffer = @@current)
  @@list.find { |buf|  buf != buffer } || Buffer.find_or_new("*scratch*")
end

.region_boundaries(s, e) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 907

def self.region_boundaries(s, e)
  if s > e
    [e, s]
  else
    [s, e]
  end
end

Instance Method Details

#[](name) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 349

def [](name)
  if @attributes.key?(name)
    @attributes[name]
  else
    CONFIG[name]
  end
end

#[]=(name, value) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 357

def []=(name, value)
  @attributes[name] = value
end

#apply_mode(mode_class) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1271

def apply_mode(mode_class)
  @keymap = nil
  @mode = mode_class.new(self)
  Utils.run_hooks(mode_class.hook_name)
end

#backward_char(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 645

def backward_char(n = 1)
  forward_char(-n)
end

#backward_delete_char(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 634

def backward_delete_char(n = 1)
  delete_char(-n)
end

#backward_line(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 693

def backward_line(n = 1)
  forward_line(-n)
end

#backward_word(n = 1, regexp: /\p{Letter}|\p{Number}/) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 660

def backward_word(n = 1, regexp: /\p{Letter}|\p{Number}/)
  n.times do
    break if beginning_of_buffer?
    backward_char
    while !beginning_of_buffer? && regexp !~ char_after
      backward_char
    end
    while !beginning_of_buffer? && regexp =~ char_after
      backward_char
    end
    if regexp !~ char_after
      forward_char
    end
  end
end

#beginning_of_buffer ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 718

def beginning_of_buffer
  if @save_point_level == 0
    @current_line = 1
    @current_column = 1
  end
  @point = 0
end

#beginning_of_buffer? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 726

def beginning_of_buffer?
  @point == 0
end

#beginning_of_line ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 738

def beginning_of_line
  while !beginning_of_line?
    backward_char
  end
  @point
end

#beginning_of_line? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 745

def beginning_of_line?
  beginning_of_buffer? || byte_before == "\n"
end

#binary? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 272

def binary?
  @binary
end

#byte_after(location = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 454

def byte_after(location = @point)
  if location < @gap_start
    @contents.byteslice(location)
  else
    @contents.byteslice(location + gap_size)
  end
end

#byte_before(location = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 462

def byte_before(location = @point)
  if location <= point_min || location > point_max
    nil
  else
    byte_after(location - 1)
  end
end

#byteindex(forward, re, pos) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1125

def byteindex(forward, re, pos)
  @match_offsets = []
  method = forward ? :index : :rindex
  adjust_gap(0, point_max)
  s = @contents[0...@gap_start]
  if @binary
    offset = pos
  else
    offset = s.byteslice(0, pos).force_encoding(Encoding::UTF_8).size
    s.force_encoding(Encoding::UTF_8)
  end
  begin
    i = s.send(method, re, offset)
    if i
      m = Regexp.last_match
      if m.nil?
        # A bug of rindex
        @match_offsets.push([pos, pos])
        pos
      else
        b = m.pre_match.bytesize
        e = b + m.to_s.bytesize
        if e <= bytesize
          @match_offsets.push([b, e])
          match_beg = m.begin(0)
          match_str = m.to_s
          (1 .. m.size - 1).each do |j|
            cb, ce = m.offset(j)
            if cb.nil?
              @match_offsets.push([nil, nil])
            else
              bb = b + match_str[0, cb - match_beg].bytesize
              be = b + match_str[0, ce - match_beg].bytesize
              @match_offsets.push([bb, be])
            end
          end
          b
        else
          nil
        end
      end
    else
      nil
    end
  end
end

#bytesize ⇒ Object Also known as: size 



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# File 'lib/textbringer/buffer.rb', line 492

def bytesize
  @contents.bytesize - gap_size
end

#char_after(location = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 470

def char_after(location = @point)
  if @binary
    byte_after(location)
  else
    s = substring(location, location + UTF8_CHAR_LEN[byte_after(location)])
    s.empty? ? nil : s
  end
end

#char_before(location = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 479

def char_before(location = @point)
  if @binary
    byte_before(location)
  else
    if beginning_of_buffer?
      nil
    else
      pos = get_pos(location, -1)
      substring(pos, location)
    end
  end
end

#clear ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 963

def clear
  check_read_only_flag
  @contents = +""
  @point = @gap_start = @gap_end = 0
  @marks.each do |m|
    m.location = 0
  end
  @current_line = 1
  @current_column = 1
  @goal_column = nil
  self.modified = true
  @undo_stack.clear
  @redo_stack.clear
end

#composite_edit ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1251

def composite_edit
  @composite_edit_level += 1
  begin
    yield
  ensure
    @composite_edit_level -= 1
    if @composite_edit_level == 0 && !@composite_edit_actions.empty?
      action = CompositeAction.new(self,
                                   @composite_edit_actions.first.location)
      @composite_edit_actions.each do |i|
        action.add_action(i)
      end
      action.version = @composite_edit_actions.first.version
      push_undo(action)
      @composite_edit_actions.clear
    end
  end
  fire_callbacks(:modified)
end

#copy_region(s = @point, e = mark, append = false) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 915

def copy_region(s = @point, e = mark, append = false)
  s, e = Buffer.region_boundaries(s, e)
  str = substring(s, e)
  if append && !KILL_RING.empty?
    KILL_RING.current.concat(str)
  else
    KILL_RING.push(str)
  end
end

#current? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 325

def current?
  @@current == self
end

#current_symbol ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1332

def current_symbol
  from = save_point { skip_re_backward(@mode.symbol_pattern); @point }
  to = save_point { skip_re_forward(@mode.symbol_pattern); @point }
  from < to ? substring(from, to) : nil
end

#delete_char(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 596

def delete_char(n = 1)
  check_read_only_flag
  adjust_gap
  s = @point
  pos = get_pos(@point, n)
  if n > 0
    str = substring(s, pos)
    # fill the gap with NUL to avoid invalid byte sequence in UTF-8
    @contents[@gap_end...user_to_gap(pos)] = "\0" * (pos - @point)
    @gap_end += pos - @point
    @marks.each do |m|
      if m.location > pos
        m.location -= pos - @point
      elsif m.location > @point
        m.location = @point
      end
    end
    push_undo(DeleteAction.new(self, s, s, str))
    self.modified = true
  elsif n < 0
    str = substring(pos, s)
    update_line_and_column(@point, pos)
    # fill the gap with NUL to avoid invalid byte sequence in UTF-8
    @contents[user_to_gap(pos)...@gap_start] = "\0" * (@point - pos)
    @marks.each do |m|
      if m.location >= @point
        m.location -= @point - pos
      elsif m.location > pos
        m.location = pos
      end
    end
    @point = @gap_start = pos
    push_undo(DeleteAction.new(self, s, pos, str))
    self.modified = true
  end
  @goal_column = nil
end

#delete_region(s = @point, e = mark) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 930

def delete_region(s = @point, e = mark)
  check_read_only_flag
  old_pos = @point
  s, e = Buffer.region_boundaries(s, e)
  update_line_and_column(old_pos, s)
  save_point do
    str = substring(s, e)
    @point = s
    adjust_gap
    len = e - s
    # fill the gap with NUL to avoid invalid byte sequence in UTF-8
    @contents[@gap_end, len] = "\0" * len
    @gap_end += len
    @marks.each do |m|
      if m.location > e
        m.location -= len
      elsif m.location > s
        m.location = s
      end
    end
    push_undo(DeleteAction.new(self, old_pos, s, str))
    self.modified = true
  end
end

#delete_visible_mark ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 900

def delete_visible_mark
  if @visible_mark
    @visible_mark.delete
    @visible_mark = nil
  end
end

#display_width(s) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 201

def display_width(s)
  Buffer.display_width(expand_tab(s))
end

#dump(path) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1286

def dump(path)
  File.binwrite(path, to_s)
  metadata = {
    "name" => name,
    "file_name" => file_name,
    "file_encoding" => file_encoding.name,
    "file_format" => file_format.to_s
  }
  File.binwrite(path + ".metadata", metadata.to_json)
end

#end_of_buffer ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 730

def end_of_buffer
  goto_char(bytesize)
end

#end_of_buffer? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 734

def end_of_buffer?
  @point == bytesize
end

#end_of_line ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 749

def end_of_line
  while !end_of_line?
    forward_char
  end
  @point
end

#end_of_line? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 756

def end_of_line?
  end_of_buffer? || byte_after == "\n"
end

#exchange_point_and_mark(mark = @mark) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 786

def exchange_point_and_mark(mark = @mark)
  if mark.nil?
    raise EditorError, "The mark is not set"
  end
  update_line_and_column(@point, mark.location)
  @point, mark.location = mark.location, @point
end

#expand_tab(s) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 192

def expand_tab(s)
  # TODO: Support multibyte characters
  tw = self[:tab_width]
  fmt = "A#{tw}"
  s.b.gsub(/([^\t]{#{tw}})|([^\t]*)\t/n) {
    [$+].pack(fmt)
  }.force_encoding(Encoding::UTF_8)
end

#file_modified? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 432

def file_modified?
  !@file_mtime.nil? && File.mtime(@file_name) != @file_mtime
end

#forward_char(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 638

def forward_char(n = 1)
  pos = get_pos(@point, n)
  update_line_and_column(@point, pos)
  @point = pos
  @goal_column = nil
end

#forward_line(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 676

def forward_line(n = 1)
  if n > 0
    n.times do
      end_of_line
      break if end_of_buffer?
      forward_char
    end
  elsif n < 0
    (-n).times do
      beginning_of_line
      break if beginning_of_buffer?
      backward_char
      beginning_of_line
    end
  end
end

#forward_word(n = 1, regexp: /\p{Letter}|\p{Number}/) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 649

def forward_word(n = 1, regexp: /\p{Letter}|\p{Number}/)
  n.times do
    while !end_of_buffer? && regexp !~ char_after
      forward_char
    end
    while !end_of_buffer? && regexp =~ char_after
      forward_char
    end
  end
end

#gap_filled_with_nul? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 1247

def gap_filled_with_nul?
  @contents[@gap_start...@gap_end]&.match?(/\A\0*\z/)
end

#get_line_and_column(pos) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 505

def get_line_and_column(pos)
  line = 1 + @contents[0...user_to_gap(pos)].count("\n")
  if pos == point_min
    column = 1
  else
    i = @contents.rindex("\n", user_to_gap(pos - 1))
    if i
      i += 1
    else
      i = 0
    end
    column = 1 + substring(gap_to_user(i), pos).size
  end
  [line, column]
end

#goto_char(pos) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 521

def goto_char(pos)
  if pos < 0 || pos > size
    raise RangeError, "Out of buffer"
  end
  if !@binary && byte_after(pos)&.match?(/[\x80-\xbf]/n)
    raise ArgumentError, "Position is in the middle of a character"
  end
  @goal_column = nil
  if @save_point_level == 0
    @current_line, @current_column = get_line_and_column(pos)
  end
  @point = pos
end

#goto_line(n) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 535

def goto_line(n)
  pos = point_min
  i = 1
  while i < n && pos < @contents.bytesize
    pos = @contents.index("\n", pos)
    break if pos.nil?
    i += 1
    pos += 1
  end
  @point = gap_to_user(pos)
  @current_line = i
  @current_column = 1
  @goal_column = nil
end

#gsub(*args, &block) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1350

def gsub(*args, &block)
  if block
    s = to_s.gsub(*args) { |*params|
      block.binding.eval('->(backref) { $~ = backref }').call($~)
      block.call(*params)
    }
  else
    s = to_s.gsub(*args)
  end

  composite_edit do
    delete_region(point_min, point_max)
    insert(s)
  end
  self
end

#indent_to(column) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1277

def indent_to(column)
  s = if self[:indent_tabs_mode]
    "\t" * (column / self[:tab_width]) + " " * (column % self[:tab_width])
  else
    " " * column
  end
  insert(s)
end

#insert(x, merge_undo = false) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 550

def insert(x, merge_undo = false)
  s = x.to_s
  check_read_only_flag
  pos = @point
  size = s.bytesize
  adjust_gap(size)
  @contents[@point, size] = s.b
  @marks.each do |m|
    if m.location > @point
      m.location += size
    end
  end
  @point = @gap_start += size
  update_line_and_column(pos, @point)
  unless @undoing
    if merge_undo && @undo_stack.last.is_a?(InsertAction)
      @undo_stack.last.merge(s)
      @redo_stack.clear
    else
      push_undo(InsertAction.new(self, pos, s))
    end
  end
  self.modified = true
  @goal_column = nil
  self
end

#insert_final_newline ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1378

def insert_final_newline
  save_excursion do
    end_of_buffer
    if char_before != "\n"
      insert("\n")
    end
  end
end

#insert_for_yank(s) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1006

def insert_for_yank(s)
  if @mark.nil? || !point_at_mark?(@mark)
    push_mark
  end
  insert(s)
end

#inspect ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 245

def inspect
  "#<Buffer:#{@name || '0x%x' % object_id}>"
end

#kill ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 309

def kill
  @@table.delete(@name)
  @@list.delete(self)
  if @@current == self
    @@current = nil
  end
  @marks.each do |mark|
    mark.detach
  end
  fire_callbacks(:killed)
end

#kill_line(append = false) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 978

def kill_line(append = false)
  save_point do |saved|
    if end_of_buffer?
      raise RangeError, "End of buffer"
    end
    if char_after == ?\n
      forward_char
    else
      end_of_line
    end
    pos = @point
    point_to_mark(saved)
    kill_region(@point, pos, append)
  end
end

#kill_region(s = @point, e = mark, append = false) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 925

def kill_region(s = @point, e = mark, append = false)
  copy_region(s, e, append)
  delete_region(s, e)
end

#kill_word(append = false) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 994

def kill_word(append = false)
  save_point do |saved|
    if end_of_buffer?
      raise RangeError, "End of buffer"
    end
    forward_word
    pos = @point
    point_to_mark(saved)
    kill_region(@point, pos, append)
  end
end

#looking_at?(re) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 1116

def looking_at?(re)
  if re.is_a?(Regexp)
    r = /\G#{re}/
  else
    r = "\\G(?:#{re})"
  end
  byteindex(true, r, @point) == @point
end

#mark ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 828

def mark
  if @mark.nil?
    raise EditorError, "The mark is not set"
  end
  @mark.location
end

#mark_to_point(mark) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 770

def mark_to_point(mark)
  mark.location = @point
end

#match_beginning(n) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1172

def match_beginning(n)
  @match_offsets[n]&.first
end

#match_end(n) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1176

def match_end(n)
  @match_offsets[n]&.last
end

#match_string(n) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1180

def match_string(n)
  b, e = @match_offsets[n]
  if b.nil?
    nil
  else
    substring(b, e)
  end
end

#modified=(modified) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 334

def modified=(modified)
  @modified = modified
  if @composite_edit_level == 0 && modified
    fire_callbacks(:modified)
  end
end

#modified? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 341

def modified?
  @modified
end

#new_file? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 361

def new_file?
  @new_file
end

#new_mark(location = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 760

def new_mark(location = @point)
  Mark.new(self, location).tap { |m|
    @marks << m
  }
end

#newline ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 577

def newline
  indentation = save_point { |saved|
    if char_after&.match?(/[ \t]/)
      next ""
    end
    beginning_of_line
    s = @point
    while char_after&.match?(/[ \t]/)
      forward_char
    end
    str = substring(s, @point)
    if end_of_buffer? || char_after == "\n"
      delete_region(s, @point)
    end
    str
  }
  insert("\n" + indentation)
end

#next_line(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 697

def next_line(n = 1)
  column = get_goal_column
  n.times do
    end_of_line
    forward_char
    adjust_column(column)
  end
  @goal_column = column
end

#on(name, &callback) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 329

def on(name, &callback)
  @callbacks[name] ||= []
  @callbacks[name].push(callback)
end

#on_global_mark_ring? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 858

def on_global_mark_ring?
  mark_ring = Buffer.global_mark_ring
  if mark_ring.empty?
    return false
  end
  current = mark_ring.current
  if current&.buffer == self
    return true
  end
  next_mark = mark_ring[-1]
  if next_mark&.buffer ==  self
    return true
  end
  false
end

#on_killed(&callback) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 321

def on_killed(&callback)
  add_callback(:killed, callback)
end

#on_modified(&callback) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 345

def on_modified(&callback)
  add_callback(:modified, callback)
end

#point_after_mark?(mark) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 782

def point_after_mark?(mark)
  @point > mark.location
end

#point_at_mark?(mark) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 774

def point_at_mark?(mark)
  @point == mark.location
end

#point_before_mark?(mark) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 778

def point_before_mark?(mark)
  @point < mark.location
end

#point_max ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 501

def point_max
  bytesize
end

#point_min ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 497

def point_min
  0
end

#point_to_mark(mark) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 766

def point_to_mark(mark)
  goto_char(mark.location)
end

#pop_mark ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 885

def pop_mark
  return if @mark_ring.empty?
  @mark = @mark_ring.rotate(1)
end

#pop_to_mark ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 890

def pop_to_mark
  goto_char(mark)
  pop_mark
end

#previous_line(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 707

def previous_line(n = 1)
  column = get_goal_column
  n.times do
    beginning_of_line
    backward_char
    beginning_of_line
    adjust_column(column)
  end
  @goal_column = column
end

#push_global_mark(pos = @point, force: false) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 874

def push_global_mark(pos = @point, force: false)
  if force || !on_global_mark_ring?
    mark = new_mark
    mark.location = pos
    Buffer.global_mark_ring.push(mark)
    true
  else
    false
  end
end

#push_mark(pos = @point) ⇒ Object

Set mark at pos, and push the mark on the mark ring. Unlike Emacs, the new mark is pushed on the mark ring instead of the old one.



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# File 'lib/textbringer/buffer.rb', line 846

def push_mark(pos = @point)
  @mark = new_mark
  @mark.location = pos
  @mark_ring.push(@mark)
  if self != Buffer.minibuffer
    global_mark_ring = Buffer.global_mark_ring
    if global_mark_ring.empty? || global_mark_ring.current.buffer != self
      push_global_mark(pos)
    end
  end
end

#re_search_backward(s, raise_error: true, count: 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1086

def re_search_backward(s, raise_error: true, count: 1)
  if count < 0
    return re_search_forward(s, raise_error: raise_error, count: -count)
  end
  re = new_regexp(s)
  pos = @point
  count.times do
    p = pos
    begin
      i = byteindex(false, re, p)
      if i.nil?
        if raise_error
          raise SearchError, "Search failed"
        else
          return nil
        end
      end
      p = get_pos(p, -1)
    rescue RangeError
      if raise_error
        raise SearchError, "Search failed"
      else
        return nil
      end
    end while match_end(0) > pos
    pos = match_beginning(0)
  end
  goto_char(pos)
end

#re_search_forward(s, raise_error: true, count: 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1066

def re_search_forward(s, raise_error: true, count: 1)
  if count < 0
    return re_search_backward(s, raise_error: raise_error, count: -count)
  end
  re = new_regexp(s)
  pos = @point
  count.times do
    i = byteindex(true, re, pos)
    if i.nil?
      if raise_error
        raise SearchError, "Search failed"
      else
        return nil
      end
    end
    pos = match_end(0)
  end
  goto_char(pos)
end

#read_only=(value) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 293

def read_only=(value)
  @read_only = value
  if @read_only
    @modified = false
  end
end

#read_only? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 289

def read_only?
  @read_only
end

#read_only_edit ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 300

def read_only_edit
  self.read_only = false
  begin
    yield
  ensure
    self.read_only = true
  end
end

#redo ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1044

def redo
  check_read_only_flag
  if @redo_stack.empty?
    raise EditorError, "No further redo information"
  end
  action = @redo_stack.pop
  @undoing = true
  begin
    was_modified = @modified
    action.redo
    if action.version == @version
      @modified = false
      action.version = nil
    elsif !was_modified
      action.version = @version
    end
    @undo_stack.push(action)
  ensure
    @undoing = false
  end
end

#replace(str, start: point_min, end: point_max) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 955

def replace(str, start: point_min, end: point_max)
  composite_edit do
    delete_region(start, binding.local_variable_get(:end))
    goto_char(start)
    insert(str)
  end
end

#replace_match(str) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1189

def replace_match(str)
  new_str = str.gsub(/\\(?:([0-9]+)|(&)|(\\))/) { |s|
    case
    when $1
      match_string($1.to_i)
    when $2
      match_string(0)
    when $3
      "\\"
    end
  }
  b = match_beginning(0)
  e =  match_end(0)
  goto_char(b)
  composite_edit do
    delete_region(b, e)
    insert(new_str)
  end
end

#replace_regexp_forward(regexp, to_str) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1209

def replace_regexp_forward(regexp, to_str)
  result = 0
  rest = substring(point, point_max)
  composite_edit do
    delete_region(point, point_max)
    new_str = rest.gsub(new_regexp(regexp)) {
      result += 1
      m = Regexp.last_match
      to_str.gsub(/\\(?:([0-9]+)|(&)|(\\))/) { |s|
      case
      when $1
        m[$1.to_i]
      when $2
        m.to_s
      when $3
        "\\"
      end
      }
    }
    insert(new_str)
  end
  result
end

#revert(enc = nil) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 373

def revert(enc = nil)
  if @file_name.nil?
    raise EditorError, "Buffer has no file name"
  end
  clear
  s, mtime = File.open(@file_name,
                       external_encoding: Encoding::ASCII_8BIT,
                       binmode: true) { |f|
    f.flock(File::LOCK_SH)
    [f.read, f.mtime]
  }
  enc ||= @@detect_encoding_proc.call(s) || Encoding::ASCII_8BIT
  s.force_encoding(enc)
  unless s.valid_encoding?
    enc = Encoding::ASCII_8BIT
    s.force_encoding(enc)
  end
  set_contents(s, enc)
  @file_mtime = mtime
  @modified = false
end

#save(file_name = @file_name) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 395

def save(file_name = @file_name)
  if file_name.nil?
    raise EditorError, "File name is not set"
  end
  file_name = File.expand_path(file_name)
  config = EditorConfig.load_file(file_name)
  if config["trim_trailing_whitespace"]
    trim_trailing_whitespace
  end
  if config["insert_final_newline"]
    insert_final_newline
  end
  begin
    File.open(file_name, "w",
              external_encoding: @file_encoding, binmode: true) do |f|
      f.flock(File::LOCK_EX)
      write_to_file(f)
      f.flush
    end
    @file_mtime = File.mtime(file_name)
  rescue Errno::EISDIR
    if @name
      file_name = File.expand_path(@name, file_name)
      retry
    else
      raise
    end
  end
  if file_name != @file_name
    self.file_name = file_name
  end
  @version += 1
  @modified = false
  @new_file = false
  @read_only = false
end

#save_excursion ⇒ Object

Don’t save Buffer.current.



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# File 'lib/textbringer/buffer.rb', line 811

def save_excursion
  old_point = new_mark
  old_mark = @mark&.dup
  old_column = @goal_column
  begin
    yield
  ensure
    point_to_mark(old_point)
    old_point.delete
    if old_mark
      @mark.location = old_mark.location
      old_mark.delete
    end
    @goal_column = old_column
  end
end

#save_point ⇒ Object

The buffer should not be modified in the given block because current_line/current_column is not updated in save_point.



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# File 'lib/textbringer/buffer.rb', line 796

def save_point
  saved = new_mark
  column = @goal_column
  @save_point_level += 1
  begin
    yield(saved)
  ensure
    point_to_mark(saved)
    saved.delete
    @goal_column = column
    @save_point_level -= 1
  end
end

#set_mark(pos = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 835

def set_mark(pos = @point)
  if @mark
    @mark.location = pos
  else
    push_mark(pos)
  end
end

#set_visible_mark(pos = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 895

def set_visible_mark(pos = @point)
  @visible_mark ||= new_mark
  @visible_mark.location = pos
end

#skip_re_backward(re) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1344

def skip_re_backward(re)
  while re =~ char_before
    backward_char
  end
end

#skip_re_forward(re) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1338

def skip_re_forward(re)
  while re =~ char_after
    forward_char
  end
end

#substring(s, e) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 442

def substring(s, e)
  result =
    if s > @gap_start || e <= @gap_start
      @contents[user_to_gap(s)...user_to_gap(e)]
    else
      len = @gap_start - s
      @contents[user_to_gap(s), len] + @contents[@gap_end, e - s - len]
    end
  result.force_encoding(Encoding::UTF_8) unless @binary
  result
end

#to_s ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 436

def to_s
  result = (@contents[0...@gap_start] + @contents[@gap_end..-1])
  result.force_encoding(Encoding::UTF_8) unless @binary
  result
end

#transpose_chars ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1233

def transpose_chars
  if end_of_line?
    backward_char
  end
  if beginning_of_buffer?
    raise RangeError, "Beginning of buffer"
  end
  backward_char
  c = char_after
  delete_char
  forward_char
  insert(c)
end

#trim_trailing_whitespace ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1367

def trim_trailing_whitespace
  save_excursion do
    beginning_of_buffer
    composite_edit do
      while re_search_forward(/[ \t]+$/, raise_error: false)
        replace_match("")
      end
    end
  end
end

#undo ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1022

def undo
  check_read_only_flag
  if @undo_stack.empty?
    raise EditorError, "No further undo information"
  end
  action = @undo_stack.pop
  @undoing = true
  begin
    was_modified = @modified
    action.undo
    if action.version == @version
      @modified = false
      action.version = nil
    elsif !was_modified
      action.version = @version
    end
    @redo_stack.push(action)
  ensure
    @undoing = false
  end
end

#yank ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1013

def yank
  insert_for_yank(KILL_RING.current)
end

#yank_pop ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1017

def yank_pop
  delete_region
  insert_for_yank(KILL_RING.rotate(1))
end