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)
  e == Encoding::US_ASCII ? Encoding::UTF_8 : e
}
@@auto_detect_encodings = 
[
  Encoding::UTF_8,
  Encoding::EUC_JP,
  Encoding::Windows_31J
]
@@detect_encoding_proc = 
DEFAULT_DETECT_ENCODING
@@table = 
{}
@@list = 
[]
@@current = 
nil
@@minibuffer = 
nil

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(s = String.new, name: nil, file_name: nil, file_encoding: Encoding::UTF_8, 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 166

def initialize(s = String.new, name: nil,
               file_name: nil, file_encoding: Encoding::UTF_8,
               file_mtime: nil, new_file: true, undo_limit: UNDO_LIMIT,
               read_only: false)
  case s.encoding
  when Encoding::UTF_8, Encoding::ASCII_8BIT
    @contents = s.frozen? ? s.dup : s
  else
    @contents = s.encode(Encoding::UTF_8)
  end
  @contents.force_encoding(Encoding::ASCII_8BIT)
  @name = name
  @file_name = file_name
  self.file_encoding = file_encoding
  @file_mtime = file_mtime
  case @contents
  when /(?<!\r)\n/ 
    @file_format = :unix
  when /\r(?!\n)/
    @file_format = :mac
    @contents.gsub!(/\r/, "\n")
  when /\r\n/
    @file_format = :dos
    @contents.gsub!(/\r/, "")
  else
    @file_format = :unix
  end
  @new_file = new_file
  @undo_limit = undo_limit
  @point = 0
  @gap_start = 0
  @gap_end = 0
  @marks = []
  @mark = nil
  @current_line = 1
  @current_column = 1  # One-based character count
  @goal_column = nil   # Zero-based display width count
  @yank_start = new_mark
  @undo_stack = []
  @redo_stack = []
  @undoing = false
  @version = 0
  @modified = false
  @mode = nil
  @keymap = nil
  @attributes = {}
  @save_point_level = 0
  @match_offsets = []
  @visible_mark = nil
  @read_only = read_only
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 14

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 14

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 13

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 13

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 13

def file_name
  @file_name
end

#keymap ⇒ Object

Returns the value of attribute keymap.



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

def keymap
  @keymap
end

#marks ⇒ Object (readonly)

Returns the value of attribute marks.



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

def marks
  @marks
end

#mode ⇒ Object

Returns the value of attribute mode.



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

def mode
  @mode
end

#modified=(value) ⇒ Object (writeonly)

Sets the attribute modified

Parameters:

  • value —

    the value to set the attribute modified to.



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# File 'lib/textbringer/buffer.rb', line 15

def modified=(value)
  @modified = value
end

#name ⇒ Object

Returns the value of attribute name.



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

def name
  @name
end

#point ⇒ Object (readonly)

Returns the value of attribute point.



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

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 14

def visible_mark
  @visible_mark
end

Class Method Details

.[](name) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 105

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

.add(buffer) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 72

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

.auto_detect_encodings ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 56

def self.auto_detect_encodings
  @@auto_detect_encodings
end

.auto_detect_encodings=(encodings) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 60

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

.count ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 101

def self.count
  @@table.size
end

.current ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 77

def self.current
  @@current
end

.current=(buffer) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 81

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

.detect_encoding_proc ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 64

def self.detect_encoding_proc
  @@detect_encoding_proc
end

.detect_encoding_proc=(f) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 68

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 160

def self.display_width(s)
  # ncurses seems to treat ambiguous east asian characters as narrow.
  Unicode::DisplayWidth.of(s, 1)
end

.dump_unsaved_buffers(dir) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1120

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 1129

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 156

def self.each(&block)
  @@table.each_value(&block)
end

.find_file(file_name) ⇒ Object 



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

def self.find_file(file_name)
  file_name = File.expand_path(file_name)
  buffer = @@table.each_value.find { |buffer|
    buffer.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 109

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

.kill_em_all ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 117

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

.last ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 93

def self.last
  if @@list.last == @@current
    @@list[-2]
  else
    @@list.last
  end
end

.load(path) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1109

def self.load(path)
  buffer = Buffer.new(File.read(path))
  metadata = JSON.parse(File.read(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 1133

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 89

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

.names ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 113

def self.names
  @@table.keys
end

.new_buffer(name, **opts) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 140

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 146

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 305

def self.open(file_name, name: File.basename(file_name))
  s, mtime = File.open(file_name) { |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
  Buffer.new(s, name: name,
             file_name: file_name, file_encoding: enc, file_mtime: mtime,
             new_file: false, read_only: !File.writable?(file_name))
end

Instance Method Details

#[](name) ⇒ Object 



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

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 297

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

#apply_mode(mode_class) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1084

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

#backward_char(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 548

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 537

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 596

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

#backward_word(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 563

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

#beginning_of_buffer ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 641

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 649

def beginning_of_buffer?
  @point == 0
end

#beginning_of_line ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 661

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 668

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 245

def binary?
  @binary
end

#byte_after(location = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 372

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 380

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 946

def byteindex(forward, re, pos)
  @match_offsets = []
  method = forward ? :index : :rindex
  adjust_gap(0, point_max)
  if @binary
    offset = pos
  else
    offset = @contents[0...pos].force_encoding(Encoding::UTF_8).size
    @contents.force_encoding(Encoding::UTF_8)
  end
  begin
    i = @contents.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
  ensure
    @contents.force_encoding(Encoding::ASCII_8BIT)
  end
end

#bytesize ⇒ Object Also known as: size 



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# File 'lib/textbringer/buffer.rb', line 397

def bytesize
  @contents.bytesize - gap_size
end

#char_after(location = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 388

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

#clear ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 816

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

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



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# File 'lib/textbringer/buffer.rb', line 775

def copy_region(s = @point, e = mark, append = false)
  str = s <= e ? substring(s, e) : substring(e, s)
  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 281

def current?
  @@current == self
end

#delete_char(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 499

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))
    @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))
    @modified = true
  end
  @goal_column = nil
end

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



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# File 'lib/textbringer/buffer.rb', line 789

def delete_region(s = @point, e = mark)
  check_read_only_flag
  old_pos = @point
  if s > e
    s, e = e, s
  end
  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)) 
    @modified = true
  end
end

#delete_visible_mark ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 768

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

#dump(path) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1098

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

#end_of_buffer ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 653

def end_of_buffer
  goto_char(bytesize)
end

#end_of_buffer? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 657

def end_of_buffer?
  @point == bytesize
end

#end_of_line ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 672

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 679

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 709

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

#file_modified? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 350

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 541

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 579

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) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 552

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

#gap_filled_with_nul? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 1067

def gap_filled_with_nul?
  /\A\0*\z/ =~ @contents[@gap_start...@gap_end] ? true : false
end

#get_line_and_column(pos) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 410

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 426

def goto_char(pos)
  if pos < 0 || pos > size
    raise RangeError, "Out of buffer"
  end
  if !@binary && /[\x80-\xbf]/n =~ byte_after(pos)
    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 440

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

#indent_to(column) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1089

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(s, merge_undo = false) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 455

def insert(s, merge_undo = false)
  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
  @modified = true
  @goal_column = nil
end

#insert_for_yank(s) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 859

def insert_for_yank(s)
  mark_to_point(@yank_start)
  insert(s)
end

#inspect ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 218

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

#kill ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 273

def kill
  @@table.delete(@name)
  @@list.delete(self)
  if @@current == self
    @@current = nil
  end
end

#kill_line(append = false) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 831

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 784

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 847

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 941

def looking_at?(re)
  # TODO: optimization
  byteindex(true, re, @point) == @point
end

#mark ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 751

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 693

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

#match_beginning(n) ⇒ Object 



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

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

#match_end(n) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 998

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

#match_string(n) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1002

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

#merge_undo(n) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1071

def merge_undo(n)
  return if @undoing || @undo_limit == 0
  actions = @undo_stack.pop(n)
  if actions
    action = CompositeAction.new(self, actions.first.location)
    actions.each do |i|
      action.add_action(i)
    end
    action.version = actions.first.version
    @undo_stack.push(action)
  end
end

#modified? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 285

def modified?
  @modified
end

#new_file? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 301

def new_file?
  @new_file
end

#new_mark(location = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 683

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 480

def newline
  indentation = save_point { |saved|
    if /[ \t]/ =~ char_after
      next ""
    end
    beginning_of_line
    s = @point
    while /[ \t]/ =~ char_after
      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 600

def next_line(n = 1)
  if @goal_column
    column = @goal_column
  else
    prev_point = @point
    beginning_of_line
    column = Buffer.display_width(substring(@point, prev_point))
  end
  n.times do
    end_of_line
    forward_char
    s = @point
    while !end_of_line? &&
        Buffer.display_width(substring(s, @point)) < column
      forward_char
    end
  end
  @goal_column = column
end

#point_after_mark?(mark) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 705

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 697

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 701

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

#point_max ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 406

def point_max
  bytesize
end

#point_min ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 402

def point_min
  0
end

#point_to_mark(mark) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 689

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

#previous_line(n = 1) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 620

def previous_line(n = 1)
  if @goal_column
    column = @goal_column
  else
    prev_point = @point
    beginning_of_line
    column = Buffer.display_width(substring(@point, prev_point))
  end
  n.times do
    beginning_of_line
    backward_char
    beginning_of_line
    s = @point
    while !end_of_line? &&
        Buffer.display_width(substring(s, @point)) < column
      forward_char
    end
  end
  @goal_column = column
end

#re_search_backward(s) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 926

def re_search_backward(s)
  re = new_regexp(s)
  pos = @point
  begin
    i = byteindex(false, re, pos)
    if i.nil?
      raise SearchError, "Search failed"
    end
    pos = get_pos(pos, -1)
  rescue RangeError
    raise SearchError, "Search failed"
  end while match_end(0) > @point
  goto_char(match_beginning(0))
end

#re_search_forward(s) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 917

def re_search_forward(s)
  re = new_regexp(s)
  i = byteindex(true, re, @point)
  if i.nil?
    raise SearchError, "Search failed"
  end
  goto_char(match_end(0))
end

#read_only=(value) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 266

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 262

def read_only?
  @read_only
end

#redo ⇒ Object 



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

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_match(str) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1011

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)
  delete_region(b, e)
  insert(new_str)
  merge_undo(2)
end

#replace_regexp_forward(regexp, to_str) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1030

def replace_regexp_forward(regexp, to_str)
  result = 0
  rest = substring(point, point_max)
  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)
  merge_undo(2)
  result
end

#save(file_name = @file_name) ⇒ Object 



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

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)
  begin
    File.open(file_name, "w", external_encoding: @file_encoding) do |f|
      f.flock(File::LOCK_EX)
      write_to_file(f)
      f.flush
      @file_mtime = f.mtime
    end
  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 734

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 719

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 758

def set_mark(pos = @point)
  @mark ||= new_mark
  @mark.location = pos
end

#set_visible_mark(pos = @point) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 763

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

#substring(s, e) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 360

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 354

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 1053

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

#undo ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 873

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 864

def yank
  insert_for_yank(KILL_RING.current)
end

#yank_pop ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 868

def yank_pop
  delete_region(@yank_start.location, @point)
  insert_for_yank(KILL_RING.current(1))
end