Class: Wongi::Engine::Token

Inherits:
Object
  • Object
show all
Includes:
CoreExt
Defined in:
lib/wongi-engine/token.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from CoreExt

included

Constructor Details

#initialize(token, wme, assignments) ⇒ Token

Returns a new instance of Token.



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

def initialize token, wme, assignments
  @parent, @wme, @assignments = token, wme, assignments
  @children = []
  @neg_join_results = []
  @opt_join_results = []
  @ncc_results = []
  @generated_wmes = []
  @deexecutors = []
  token.children << self if token
  wme.tokens << self if wme
end

Instance Attribute Details

#children ⇒ Object (readonly)

Returns the value of attribute children.



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# File 'lib/wongi-engine/token.rb', line 7

def children
  @children
end

#generated_wmes ⇒ Object (readonly)

Returns the value of attribute generated_wmes.



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# File 'lib/wongi-engine/token.rb', line 12

def generated_wmes
  @generated_wmes
end

#ncc_results ⇒ Object (readonly)

Returns the value of attribute ncc_results.



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

def ncc_results
  @ncc_results
end

#neg_join_results ⇒ Object (readonly)

Returns the value of attribute neg_join_results.



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# File 'lib/wongi-engine/token.rb', line 9

def neg_join_results
  @neg_join_results
end

#node ⇒ Object

Returns the value of attribute node.



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

def node
  @node
end

#opt_join_results ⇒ Object (readonly)

Returns the value of attribute opt_join_results.



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# File 'lib/wongi-engine/token.rb', line 10

def opt_join_results
  @opt_join_results
end

#owner ⇒ Object

Returns the value of attribute owner.



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

def owner
  @owner
end

#parent ⇒ Object (readonly)

Returns the value of attribute parent.



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# File 'lib/wongi-engine/token.rb', line 7

def parent
  @parent
end

#wme ⇒ Object (readonly)

Returns the value of attribute wme.



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# File 'lib/wongi-engine/token.rb', line 7

def wme
  @wme
end

Instance Method Details

#[](var) ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 38

def [] var
  assignments[ var ]
end

#assignments ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 34

def assignments
  @cached_assignments ||= all_assignments
end

#delete(preserve_self = false) ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 57

def delete preserve_self = false
  delete_children
  # => TODO: why was this last check needed? consult the Rete PhD
  @node.tokens.delete self unless preserve_self# or @node.kind_of?( NccPartner )
  @wme.tokens.delete self if @wme
  @parent.children.delete self if @parent

  retract_generated
  deexecute

  case @node
  when NegNode
    @neg_join_results.each do |njr|
      njr.wme.neg_join_results.delete njr if njr.wme
    end
    @neg_join_results = []

  when OptionalNode
    @opt_join_results.each do |ojr|
      ojr.wme.opt_join_results.delete ojr
    end
    @opt_join_results = []

  when NccNode
    @ncc_results.each do |nccr|
      nccr.wme.tokens.delete nccr
      nccr.parent.children.delete nccr
    end
    @ncc_results = []

  when NccPartner
    @owner.ncc_results.delete self
    if @owner.ncc_results.empty?
      @node.ncc.children.each do |node|
        node.left_activate @owner, nil, {}
      end
    end
  end

end

#delete_children ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 98

def delete_children
  while @children.first
    @children.first.delete
  end
end

#subst(variable, value) ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 27

def subst variable, value
  @cached_assignments = nil
  if @assignments.has_key? variable
    @assignments[ variable ] = value
  end
end

#to_s ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 42

def to_s
  str = "TOKEN [\n"
  all_assignments.each_pair { |key, value| str << "\t#{key} => #{value}\n" }
  str << "]"
  str
end

#wmes ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 49

def wmes
  if parent
    parent.wmes + [wme]
  else
    [wme]
  end
end