Class: Textbringer::KillRing

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

Instance Method Summary collapse

Constructor Details

#initialize(max = 30) ⇒ KillRing

Returns a new instance of KillRing.



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# File 'lib/textbringer/buffer.rb', line 1315

def initialize(max = 30)
  @max = max
  @ring = []
  @current = -1
end

Instance Method Details

#clear ⇒ Object 



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

def clear
  @ring.clear
  @current = -1
end

#current(n = 0) ⇒ Object 



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

def current(n = 0)
  if @ring.empty?
    raise EditorError, "Kill ring is empty"
  end
  @current -= n
  if @current < 0
    @current += @ring.size
  end
  @ring[@current]
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/textbringer/buffer.rb', line 1349

def empty?
  @ring.empty?
end

#push(str) ⇒ Object 



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# File 'lib/textbringer/buffer.rb', line 1326

def push(str)
  @current += 1
  if @ring.size < @max
    @ring.insert(@current, str)
  else
    if @current == @max
      @current = 0
    end
    @ring[@current] = str
  end
end