Class: Wongi::Engine::BetaMemory

Inherits:
BetaNode
  • Object
show all
Defined in:
lib/wongi-engine/beta/beta_memory.rb

Direct Known Subclasses

OrNode, ProductionNode

Instance Attribute Summary

Attributes inherited from BetaNode

#children, #context, #parent, #rete

Instance Method Summary collapse

Methods inherited from BetaNode

#assignment_node, #delete_token, #depth, #empty?, #filter_node, #join_node, #ncc_node, #neg_node, #network, #optional_node, #refresh, #size, #tokens

Methods included from CoreExt

included

Constructor Details

#initialize(parent) ⇒ BetaMemory

Returns a new instance of BetaMemory.



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# File 'lib/wongi-engine/beta/beta_memory.rb', line 5

def initialize parent
  super
  @tokens = []
end

Instance Method Details

#beta_activate(token) ⇒ Object 



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# File 'lib/wongi-engine/beta/beta_memory.rb', line 33

def beta_activate token
  existing = @tokens.reject(&:deleted?).find { |et| et.duplicate? token }
  return if existing # TODO really?
  @tokens << token
  children.each do |child|
    child.beta_activate token
  end
  token
end

#beta_deactivate(token) ⇒ Object 



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# File 'lib/wongi-engine/beta/beta_memory.rb', line 43

def beta_deactivate token
  return nil unless tokens.find token
  @tokens.delete token
  token.deleted!
  if token.parent
    token.parent.children.delete token # should this go into Token#destroy?
  end
  children.each do |child|
    child.beta_deactivate token
  end
  token
end

#beta_memory ⇒ Object 



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# File 'lib/wongi-engine/beta/beta_memory.rb', line 11

def beta_memory
  self
end

#refresh_child(child) ⇒ Object 



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# File 'lib/wongi-engine/beta/beta_memory.rb', line 56

def refresh_child child
  tokens.each do |token|
    child.beta_activate token
  end
end

#seed(assignments = {}) ⇒ Object 



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# File 'lib/wongi-engine/beta/beta_memory.rb', line 15

def seed assignments = {}
  @seed = assignments
  t = Token.new( self, nil, nil, assignments )
  @tokens << t
end

#subst(valuations) ⇒ Object 



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# File 'lib/wongi-engine/beta/beta_memory.rb', line 21

def subst valuations
  @tokens.first.destroy

  token = Token.new( self, nil, nil, @seed )
  @tokens << token

  valuations.each { |variable, value| token.subst variable, value }
  self.children.each do |child|
    child.beta_activate token
  end
end