Class: AjLisp::NilAtom

Inherits:
NamedAtom show all
Defined in:
lib/ajlisp/nil_atom.rb

Constant Summary collapse

@@instance = 
nil

Instance Attribute Summary

Attributes inherited from NamedAtom

#name

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ NilAtom 



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# File 'lib/ajlisp/nil_atom.rb', line 14

def initialize()
    super(:nil)
end

Class Method Details

.instance ⇒ Object 



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# File 'lib/ajlisp/nil_atom.rb', line 9

def self.instance
    @@instance = new unless @@instance
    return @@instance
end

Instance Method Details

#evaluate(context) ⇒ Object 



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# File 'lib/ajlisp/nil_atom.rb', line 18

def evaluate(context)
    return nil
end

#isEqualTo(atom) ⇒ Object 



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# File 'lib/ajlisp/nil_atom.rb', line 26

def isEqualTo(atom)
    if atom.is_a? NilAtom
        return true
    end
    
    if atom == nil
        return true
    end
    
    return false
end

#to_s ⇒ Object 



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# File 'lib/ajlisp/nil_atom.rb', line 22

def to_s
	return "nil"
end