Class: Fr::SZipper::EditedCursor

Inherits:
AbstractCursor show all
Defined in:
lib/fr/szipper/edited_cursor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from AbstractCursor

#empty?, #head, #next, #position, #tail, #truncate

Methods included from Enumerable

#all?, #any?, #chunk, #collect, #collect_concat, #count, #cycle, #detect, #drop, #drop_while, #each, #entries, #filter, #filter_, #first, #flat_map, #foldl, #grep, #group_by, #include?, #index, #max, #max_by, #min, #min_by, #minmax, #minmax_by, #none?, #partition, #reduce, #reject, #sort, #take, #take_while, #zip

Constructor Details

#initialize(node, prev) ⇒ EditedCursor

Returns a new instance of EditedCursor.



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# File 'lib/fr/szipper/edited_cursor.rb', line 7

def initialize(node, prev)
  @node, @prev =
    node, prev
end

Instance Attribute Details

#node ⇒ Object (readonly)

Returns the value of attribute node.



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# File 'lib/fr/szipper/edited_cursor.rb', line 5

def node
  @node
end

Instance Method Details

#append(node) ⇒ Object 



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# File 'lib/fr/szipper/edited_cursor.rb', line 28

def append(node)
  EditedCursor.new(node.copy(next: @node.next), self)
end

#delete ⇒ Object 



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# File 'lib/fr/szipper/edited_cursor.rb', line 48

def delete
  if @prev.head?
    HeadCursor.new(prev.node.copy(next: @node.next))
  else
    EditedCursor.new(prev.node.copy(next: @node.next), @prev.prev)
  end
end

#head? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fr/szipper/edited_cursor.rb', line 12

def head?
  false
end

#inspect ⇒ Object 



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# File 'lib/fr/szipper/edited_cursor.rb', line 56

def inspect
  "Cursor([..., #{@node.inspect}, ...])"
end

#prepend(node) ⇒ Object 



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# File 'lib/fr/szipper/edited_cursor.rb', line 32

def prepend(node)
  EditedCursor.new(node.copy(next: @node), prev)
end

#prev(phantom = false) ⇒ Object 



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# File 'lib/fr/szipper/edited_cursor.rb', line 20

def prev(phantom = false)
  if @prev.head?
    HeadCursor.new(@prev.node.copy(next: @node))
  else
    EditedCursor.new(@prev.node.copy(next: @node), @prev.prev)
  end
end

#replace(node) ⇒ Object 



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# File 'lib/fr/szipper/edited_cursor.rb', line 44

def replace(node)
  EditCursor.new(node, @prev)
end

#tail? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fr/szipper/edited_cursor.rb', line 16

def tail?
  @node.tail?
end

#update(node = nil) ⇒ Object 



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# File 'lib/fr/szipper/edited_cursor.rb', line 36

def update(node = nil)
  if node.nil?
    EditedCursor.new(yield(@node).copy(next: @node.next), @prev)
  else
    EditedCursor.new(node.copy(next: @node.next), @prev)
  end
end