Class: Exfuz::Group

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

Instance Method Summary collapse

Constructor Details

#initialize(positions, keys) ⇒ Group

Returns a new instance of Group.



5
6
7
8
9
 
# File 'lib/exfuz/group.rb', line 5

def initialize(positions, keys)
  @data = {}
  @raw_positions = positions
  create(positions, keys)
end

Instance Method Details

#create(positions, keys) ⇒ Object 



11
12
13
14
15
16
17
 
# File 'lib/exfuz/group.rb', line 11

def create(positions, keys)
  indices = (0...positions.size).to_a
  keys.each do |key|
    @data[key] = indices.group_by { |idx| positions[idx].slice(key) }
                        .values
  end
end

#key_positions(key) ⇒ Object 



19
20
21
22
23
 
# File 'lib/exfuz/group.rb', line 19

def key_positions(key)
  @data[key].map do |grouping_indices|
    @raw_positions[grouping_indices.first].slice(key)
  end
end

#positions(key) ⇒ Object 



25
26
27
28
29
30
31
32
 
# File 'lib/exfuz/group.rb', line 25

def positions(key)
  @data[key].each_with_object({}) do |grouping_indices, result|
    key_position = @raw_positions[grouping_indices.first].slice(key)
    result[key_position] = grouping_indices.map do |grouping_idx|
      @raw_positions[grouping_idx]
    end
  end
end