Class: Hooked::Graph

Inherits:
Object
  • Object
show all
Includes:
TSort
Defined in:
lib/hooked/graph.rb

Defined Under Namespace

Classes: CircularDependencyError, Node

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Graph

Returns a new instance of Graph.



13
14
15
 
# File 'lib/hooked/graph.rb', line 13

def initialize
  @input = []
end

Instance Attribute Details

#input ⇒ Object (readonly)

Returns the value of attribute input.



11
12
13
 
# File 'lib/hooked/graph.rb', line 11

def input
  @input
end

#output ⇒ Object (readonly)

Returns the value of attribute output.



11
12
13
 
# File 'lib/hooked/graph.rb', line 11

def output
  @output
end

Instance Method Details

#<<(node) ⇒ Object 



17
18
19
20
 
# File 'lib/hooked/graph.rb', line 17

def <<(node)
  @changed = true
  @input << node
end

#changed? ⇒ Boolean

Returns:

  • (Boolean) 


22
23
24
 
# File 'lib/hooked/graph.rb', line 22

def changed?
  !!@changed
end

#sort ⇒ Object 



26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
 
# File 'lib/hooked/graph.rb', line 26

def sort
  do_sort = input.any? do |n|
    !n.dependencies[:before].empty? || !n.dependencies[:after].empty?
  end

  if do_sort
    @nodes = input.inject({}) do |nodes, node|
      children = node.dependencies[:after].map {|d| d.inspect }
      nodes[node.advice.inspect] = Node.new(children, node); nodes
    end
    
    @nodes.each do |name, node|
      node.node.dependencies[:before].each do |dep|
        dep_name = dep.inspect
        next unless @nodes[dep_name]
        @nodes[dep_name].children << name
      end
    end
    
    strongly_connected_components.each do |name|
      next unless Array === name && name.length > 1
      raise CircularDependencyError, "Sorting failed: #{name.map {|n|
        @nodes[n].node.advice.inspect }.join ', '}"
    end
    
    @output = tsort.map {|name| @nodes[name].node }
  else
    @output = input.reverse
  end
  
  @changed = false
end

#tsort_each_child(name, &block) ⇒ Object 



63
64
65
 
# File 'lib/hooked/graph.rb', line 63

def tsort_each_child(name, &block)
  @nodes[name].children.each &block if @nodes[name]
end

#tsort_each_node(&block) ⇒ Object 



59
60
61
 
# File 'lib/hooked/graph.rb', line 59

def tsort_each_node(&block)
  @nodes.each_key &block
end