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Edit File : kill_ring.rb \| Size : 2.39 KB
class Reline::KillRing include Enumerable module State FRESH = :fresh CONTINUED = :continued PROCESSED = :processed YANK = :yank end RingPoint = Struct.new(:backward, :forward, :str) do def initialize(str) super(nil, nil, str) end def ==(other) object_id == other.object_id end end class RingBuffer attr_reader :size attr_reader :head def initialize(max = 1024) @max = max @size = 0 @head = nil # reading head of ring-shaped tape end def <<(point) if @size.zero? @head = point @head.backward = @head @head.forward = @head @size = 1 elsif @size >= @max tail = @head.forward new_tail = tail.forward @head.forward = point point.backward = @head new_tail.backward = point point.forward = new_tail @head = point else tail = @head.forward @head.forward = point point.backward = @head tail.backward = point point.forward = tail @head = point @size += 1 end end def empty? @size.zero? end end def initialize(max = 1024) @ring = RingBuffer.new(max) @ring_pointer = nil @buffer = nil @state = State::FRESH end 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 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 def yank unless @ring.empty? @state = State::YANK @ring_pointer = @ring.head @ring_pointer.str else nil end end 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 def each start = head = @ring.head loop do break if head.nil? yield head.str head = head.backward break if head == start end end end Back

Edit File : kill_ring.rb | Size : 2.39 KB

class Reline::KillRing
  include Enumerable

module State
    FRESH = :fresh
    CONTINUED = :continued
    PROCESSED = :processed
    YANK = :yank
  end

RingPoint = Struct.new(:backward, :forward, :str) do
    def initialize(str)
      super(nil, nil, str)
    end

def ==(other)
      object_id == other.object_id
    end
  end

class RingBuffer
    attr_reader :size
    attr_reader :head

def initialize(max = 1024)
      @max = max
      @size = 0
      @head = nil # reading head of ring-shaped tape
    end

def <<(point)
      if @size.zero?
        @head = point
        @head.backward = @head
        @head.forward = @head
        @size = 1
      elsif @size >= @max
        tail = @head.forward
        new_tail = tail.forward
        @head.forward = point
        point.backward = @head
        new_tail.backward = point
        point.forward = new_tail
        @head = point
      else
        tail = @head.forward
        @head.forward = point
        point.backward = @head
        tail.backward = point
        point.forward = tail
        @head = point
        @size += 1
      end
    end

def empty?
      @size.zero?
    end
  end

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

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

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

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

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

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

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