Class: Naksh::History

Inherits:
Array
  • Object
show all
Defined in:
lib/naksh/history.rb

Overview

an a subclass of Array which represents a record of entered scripts

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Array

#string

Constructor Details

#initialize(*a) ⇒ History

Returns a new instance of History.



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# File 'lib/naksh/history.rb', line 39

def initialize *a
  super
  a.empty? ? nil : @position=length-1
  self
end

Instance Attribute Details

#position ⇒ Object

Returns the value of attribute position.



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# File 'lib/naksh/history.rb', line 46

def position
  @position
end

Instance Method Details

#at!(index) ⇒ Object 



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# File 'lib/naksh/history.rb', line 48

def at!(index)
  @position=index
  self[@position]
end

#back ⇒ Object 



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# File 'lib/naksh/history.rb', line 63

def back
  return self[@position-1] unless @position<1
  nil
end

#back! ⇒ Object 



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# File 'lib/naksh/history.rb', line 68

def back!
  @position-=1 unless @position < 1
  self[@position]
end

#first! ⇒ Object 



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# File 'lib/naksh/history.rb', line 53

def first!
  @position=0
  self[@position]
end

#forward ⇒ Object 



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# File 'lib/naksh/history.rb', line 73

def forward
  return self[@position+1] unless position+1==length
  nil
end

#forward! ⇒ Object 



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# File 'lib/naksh/history.rb', line 78

def forward!
  @position+=1 unless @position+1==length
  self[@position]
end

#last! ⇒ Object 



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# File 'lib/naksh/history.rb', line 58

def last!
  @position=length-1
  self[@position]
end