Class: Frill::List::Node

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(label) ⇒ Node

Returns a new instance of Node.



122
123
124
125
126
 
# File 'lib/frill/frill.rb', line 122

def initialize(label)
  @label  = label
  @next = nil
  @previous  = nil
end

Instance Attribute Details

#label ⇒ Object (readonly)

Returns the value of attribute label.



120
121
122
 
# File 'lib/frill/frill.rb', line 120

def label
  @label
end

#next ⇒ Object

Returns the value of attribute next.



119
120
121
 
# File 'lib/frill/frill.rb', line 119

def next
  @next
end

#previous ⇒ Object

Returns the value of attribute previous.



119
120
121
 
# File 'lib/frill/frill.rb', line 119

def previous
  @previous
end

Instance Method Details

#first ⇒ Object 



144
145
146
147
148
149
150
151
152
153
154
155
156
157
 
# File 'lib/frill/frill.rb', line 144

def first
  node = nil
  current_node = self

  until node
    if current_node.previous
      current_node = current_node.previous
    else
      node = current_node
    end
  end

  node
end

#last ⇒ Object 



159
160
161
162
163
164
165
166
167
168
169
170
171
172
 
# File 'lib/frill/frill.rb', line 159

def last
  current_node = self
  last_node = nil

  until last_node
    if current_node.next
      current_node = current_node.next
    else
      last_node = current_node
    end
  end

  last_node
end

#move_after(node) ⇒ Object 



136
137
138
139
140
141
142
 
# File 'lib/frill/frill.rb', line 136

def move_after node
  previous_node = node.last
  first_node  = first

  previous_node.next = first_node
  first_node.previous   = previous_node
end

#move_before(node) ⇒ Object 



128
129
130
131
132
133
134
 
# File 'lib/frill/frill.rb', line 128

def move_before node
  next_node = node.first
  previous_node = self.last

  previous_node.next = next_node
  next_node.previous = previous_node
end

#to_a ⇒ Object 



174
175
176
177
178
179
180
181
182
183
184
185
 
# File 'lib/frill/frill.rb', line 174

def to_a
  current_node = self

  list = []

  until current_node == nil
    list << current_node.label
    current_node = current_node.next
  end

  list
end