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

- (Graph) initialize

A new instance of Graph



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

def initialize
  @input = []
end

Instance Attribute Details

- (Object) input (readonly)

Returns the value of attribute input



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

def input
  @input
end

- (Object) output (readonly)

Returns the value of attribute output



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

def output
  @output
end

Instance Method Details

- (Object) <<(node) 



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

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

- (Boolean) changed?

Returns:

  • (Boolean) 


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

def changed?
  !!@changed
end

- (Object) sort 



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# 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.object_id }
      nodes[node.advice.object_id] = Node.new(children, node); nodes
    end
    
    @nodes.each do |name, node|
      node.node.dependencies[:before].each do |dep|
        dep_name = dep.object_id
        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

- (Object) tsort_each_child(name, &block) 



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

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

- (Object) tsort_each_node(&block) 



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

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