Class: Wongi::Engine::Token

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(node, parents, wme, assignments = {}) ⇒ Token

Returns a new instance of Token.



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

def initialize(node, parents, wme, assignments = {})
  @node = node
  @parents = Set.new(Array(parents))
  @wme = wme
  @assignments = assignments
end

Instance Attribute Details

#node ⇒ Object (readonly)

Returns the value of attribute node.



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

def node
  @node
end

#parents ⇒ Object (readonly)

Returns the value of attribute parents.



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

def parents
  @parents
end

#wme ⇒ Object (readonly)

Returns the value of attribute wme.



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

def wme
  @wme
end

Instance Method Details

#[](var) ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 40

def [](var)
  a = assignment(var)
  a.respond_to?(:call) ? a.call(self) : a
end

#ancestors ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 14

def ancestors
  parents.flat_map(&:ancestors).uniq + parents.to_a
end

#assignment(x) ⇒ Object 



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

def assignment(x)
  return @assignments[x] if has_own_var?(x)

  parents.each do |parent|
    a = parent.assignment(x)
    return a if a
  end

  nil
end

#assignments ⇒ Object 



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

def assignments
  parents.each_with_object({}) do |parent, acc|
    acc.merge!(parent.assignments)
  end.merge(own_assignments)
end

#child_of?(token) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/wongi-engine/token.rb', line 18

def child_of?(token)
  parents.include?(token)
end

#duplicate?(other) ⇒ Boolean

TODO: ignore assignments?

Returns:

  • (Boolean) 


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# File 'lib/wongi-engine/token.rb', line 69

def duplicate?(other)
  instance_of?(other.class) &&
    parents == other.parents &&
    wme == other.wme &&
    own_assignments == other.own_assignments
end

#has_own_var?(x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/wongi-engine/token.rb', line 64

def has_own_var?(x)
  @assignments.key?(x)
end

#has_var?(x) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/wongi-engine/token.rb', line 60

def has_var?(x)
  has_own_var?(x) || parents.any? { _1.has_var?(x) }
end

#inspect ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 83

def inspect
  to_s
end

#own_assignments ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 30

def own_assignments
  @assignments
end

#set(variable, value) ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 26

def set(variable, value)
  @assignments[variable] = value
end

#subst(variable, value) ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 22

def subst(variable, value)
  @assignments[variable] = value if @assignments.key? variable
end

#to_s ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 76

def to_s
  str = "TOKEN [ #{object_id} ancestors=#{ancestors.map(&:object_id).map(&:to_s).join('.')} "
  assignments.each_pair { |key, value| str << "#{key}=#{value.is_a?(TokenAssignment) ? "#{value.call} (#{value})" : value} " }
  str << "]"
  str
end

#values_at(*vars) ⇒ Object 



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# File 'lib/wongi-engine/token.rb', line 45

def values_at(*vars)
  vars.map { self[_1] }
end