Class: Wongi::Engine::JoinNode

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

Instance Attribute Summary collapse

Attributes inherited from BetaNode

#children, #parent, #rete

Instance Method Summary collapse

Methods inherited from BetaNode

#assignment_node, #beta_deactivate_children, #depth, #empty?, #overlay, #refresh, #root?, #size, #tokens

Methods included from CoreExt

included

Constructor Details

#initialize(parent, tests, assignment) ⇒ JoinNode

Returns a new instance of JoinNode.



27
28
29
30
31
 
# File 'lib/wongi-engine/beta/join_node.rb', line 27

def initialize(parent, tests, assignment)
  super(parent)
  @tests = tests
  @assignment_pattern = assignment
end

Instance Attribute Details

#alpha ⇒ Object

Returns the value of attribute alpha.



24
25
26
 
# File 'lib/wongi-engine/beta/join_node.rb', line 24

def alpha
  @alpha
end

#assignment_pattern ⇒ Object (readonly)

Returns the value of attribute assignment_pattern.



25
26
27
 
# File 'lib/wongi-engine/beta/join_node.rb', line 25

def assignment_pattern
  @assignment_pattern
end

#tests ⇒ Object (readonly)

Returns the value of attribute tests.



25
26
27
 
# File 'lib/wongi-engine/beta/join_node.rb', line 25

def tests
  @tests
end

Instance Method Details

#alpha_activate(wme) ⇒ Object 



45
46
47
48
49
50
51
52
53
54
55
56
 
# File 'lib/wongi-engine/beta/join_node.rb', line 45

def alpha_activate(wme)
  # p alpha_activate: {class: self.class, object_id:, wme:}
  assignments = collect_assignments(wme)

  tokens.each do |token|
    next unless matches?(token, wme)

    children.each do |beta|
      beta.beta_activate Token.new(beta, token, wme, assignments)
    end
  end
end

#alpha_deactivate(wme) ⇒ Object 



58
59
60
 
# File 'lib/wongi-engine/beta/join_node.rb', line 58

def alpha_deactivate(wme)
  beta_deactivate_children(wme: wme)
end

#beta_activate(token) ⇒ Object 



62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/wongi-engine/beta/join_node.rb', line 62

def beta_activate(token)
  # p beta_activate: {class: self.class, object_id:, token:}
  return if tokens.find { |t| t.duplicate? token }

  overlay.add_token(token)

  template = specialize(alpha.template, tests, token)
  select_wmes(template).each do |wme|
    next unless matches?(token, wme)

    assignments = collect_assignments(wme)
    children.each do |beta|
      beta.beta_activate Token.new(beta, token, wme, assignments)
    end
  end
end

#beta_deactivate(token) ⇒ Object 



79
80
81
82
83
 
# File 'lib/wongi-engine/beta/join_node.rb', line 79

def beta_deactivate(token)
  # p beta_deactivate: {class: self.class, object_id:, token:}
  overlay.remove_token(token)
  beta_deactivate_children(token: token)
end

#equivalent?(alpha, tests, assignment_pattern) ⇒ Boolean

Returns:

  • (Boolean) 


33
34
35
36
37
38
39
40
41
42
43
 
# File 'lib/wongi-engine/beta/join_node.rb', line 33

def equivalent?(alpha, tests, assignment_pattern)
  return false unless self.alpha == alpha
  return false unless self.assignment_pattern == assignment_pattern
  return false unless (self.tests.empty? && tests.empty?) || (self.tests.length == tests.length && self.tests.all? { |my_test|
    tests.any? { |new_test|
      my_test.equivalent? new_test
    }
  })

  true
end

#refresh_child(child) ⇒ Object 



85
86
87
88
89
90
91
92
 
# File 'lib/wongi-engine/beta/join_node.rb', line 85

def refresh_child(child)
  select_wmes(alpha.template).each do |wme|
    assignments = collect_assignments(wme)
    tokens.each do |token|
      child.beta_activate Token.new(child, token, wme, assignments) if matches?(token, wme)
    end
  end
end