Class: Reline::KillRing

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/reline/kill_ring.rb

Defined Under Namespace

Modules: State Classes: RingBuffer, RingPoint

Instance Method Summary collapse

Constructor Details

#initialize(max = 1024) ⇒ KillRing

Returns a new instance of KillRing.


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

def initialize(max = 1024)
  @ring = RingBuffer.new(max)
  @ring_pointer = nil
  @buffer = nil
  @state = State::FRESH
end

Instance Method Details

#append(string, before_p = false) ⇒ Object 


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# File 'lib/reline/kill_ring.rb', line 68

def append(string, before_p = false)
  case @state
  when State::FRESH, State::YANK
    @ring << RingPoint.new(+string)
    @state = State::CONTINUED
  when State::CONTINUED, State::PROCESSED
    if before_p
      @ring.head.str.prepend(string)
    else
      @ring.head.str.concat(string)
    end
    @state = State::CONTINUED
  end
end

#each ⇒ Object 


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# File 'lib/reline/kill_ring.rb', line 116

def each
  start = head = @ring.head
  loop do
    break if head.nil?
    yield head.str
    head = head.backward
    break if head == start
  end
end

#process ⇒ Object 


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# File 'lib/reline/kill_ring.rb', line 83

def process
  case @state
  when State::FRESH
    # nothing to do
  when State::CONTINUED
    @state = State::PROCESSED
  when State::PROCESSED
    @state = State::FRESH
  when State::YANK
    # nothing to do
  end
end

#yank ⇒ Object 


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# File 'lib/reline/kill_ring.rb', line 96

def yank
  unless @ring.empty?
    @state = State::YANK
    @ring_pointer = @ring.head
    @ring_pointer.str
  else
    nil
  end
end

#yank_pop ⇒ Object 


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# File 'lib/reline/kill_ring.rb', line 106

def yank_pop
  if @state == State::YANK
    prev_yank = @ring_pointer.str
    @ring_pointer = @ring_pointer.backward
    [@ring_pointer.str, prev_yank]
  else
    nil
  end
end