Class: Wongi::Engine::OptionalNode

Inherits:
JoinNode show all
Defined in:
lib/wongi-engine/beta/optional_node.rb

Instance Attribute Summary

Attributes inherited from JoinNode

#alpha, #assignment_pattern, #tests

Attributes inherited from BetaNode

#children, #parent, #rete

Instance Method Summary collapse

Methods inherited from JoinNode

compile, #equivalent?, #initialize

Methods inherited from BetaNode

#beta_memory, #depth, #filter_node, #initialize, #join_node, #ncc_node, #neg_node, #network, #optional_node, #update_above

Methods included from CoreExt

included

Constructor Details

This class inherits a constructor from Wongi::Engine::JoinNode

Instance Method Details

#left_activate(token) ⇒ Object 



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# File 'lib/wongi-engine/beta/optional_node.rb', line 23

def left_activate token
  match = false
  alpha.wmes.each do |wme|
    assignments = collect_assignments(wme)
    if matches? token, wme
      match = true
      propagate_activation(token, wme, assignments)
      jr = OptionalJoinResult.new token, wme
      token.opt_join_results << jr
      wme.opt_join_results << jr
    end
  end
  unless match
    token.has_optional = true
    propagate_activation(token, nil, {})
  end
end

#right_activate(wme) ⇒ Object 



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# File 'lib/wongi-engine/beta/optional_node.rb', line 8

def right_activate wme
  parent.tokens.each do |token|
    if matches? token, wme
      if token.has_optional?
        token.has_optional = false
        token.delete_children
      end
      propagate_activation(token, wme, collect_assignments(wme))
      jr = OptionalJoinResult.new token, wme
      token.opt_join_results << jr
      wme.opt_join_results << jr
    end
  end
end