Class: Ruco::History

Inherits:
Object show all
Defined in:
lib/ruco/history.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ History

Returns a new instance of History.



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# File 'lib/ruco/history.rb', line 6

def initialize(options)
  @options = options
  @options[:entries] ||= 100
  @timeout = options.delete(:timeout) || 0

  @stack = [{:mutable => false, :created_at => 0, :type => :initial, :state => @options.delete(:state)}]
  @position = 0
end

Instance Attribute Details

#position ⇒ Object (readonly)

Returns the value of attribute position.



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# File 'lib/ruco/history.rb', line 4

def position
  @position
end

#stack ⇒ Object (readonly)

Returns the value of attribute stack.



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# File 'lib/ruco/history.rb', line 4

def stack
  @stack
end

#timeout ⇒ Object

Returns the value of attribute timeout.



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# File 'lib/ruco/history.rb', line 3

def timeout
  @timeout
end

Instance Method Details

#add(state) ⇒ Object 



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# File 'lib/ruco/history.rb', line 19

def add(state)
  return unless tracked_field_changes?(state)
  remove_undone_states
  unless merge? state
    # can no longer modify previous states
    @stack[@position][:mutable] = false

    state_type = type(state)
    @position += 1
    @stack[@position] = {:mutable => true, :type => state_type, :created_at => Time.now.to_f}
  end
  @stack[@position][:state] = state
  limit_stack
end

#redo ⇒ Object 



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# File 'lib/ruco/history.rb', line 38

def redo
  @position = [@position + 1, @stack.size - 1].min
end

#state ⇒ Object 



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# File 'lib/ruco/history.rb', line 15

def state
  @stack[@position][:state]
end

#undo ⇒ Object 



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# File 'lib/ruco/history.rb', line 34

def undo
  @position = [@position - 1, 0].max
end