Module: Operator

Includes:
Reportable
Defined in:
lib/re_dux/evaluate/operator.rb

Instance Method Summary collapse

Instance Method Details

#arity ⇒ Fixnum

Returns number of arguments required.

Returns:

  • (Fixnum) —

    number of arguments required



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# File 'lib/re_dux/evaluate/operator.rb', line 90

def arity
  nodes.find do |n|
    return n.text.to_i if n.name == 'arity'
  end
  2
end

#grouping? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/re_dux/evaluate/operator.rb', line 4

def grouping?
  nodes.find do |n|
    return true if n.name == 'pair'
  end
  false
end

#inverse ⇒ Object 



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# File 'lib/re_dux/evaluate/operator.rb', line 63

def inverse
  nodes.find do |n|
    return @logic[n.text] if n.name == 'inverse'
  end
  nil
end

#pair ⇒ Object

Raises:

  • (Exception) 


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# File 'lib/re_dux/evaluate/operator.rb', line 55

def pair
  return nil unless grouping?
  nodes.find do |n|
    return @logic[n.text] if n.name == 'pair'
  end
  raise Exception
end

#parent=(logic) ⇒ Object 



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# File 'lib/re_dux/evaluate/operator.rb', line 11

def parent=(logic)
  @logic = logic
end

#position ⇒ Symbol

Returns :prefix, :infix (default), or :postfix.

Returns:

  • (Symbol) —

    :prefix, :infix (default), or :postfix



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# File 'lib/re_dux/evaluate/operator.rb', line 41

def position
  nodes.find do |n|
    return n.text.to_sym if n.name == 'position'
  end
  :infix
end

#print ⇒ Object 



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# File 'lib/re_dux/evaluate/operator.rb', line 74

def print
  nodes.find do |n|
    return n.text if n.name == 'print'
  end
  symbol
end

#regexp ⇒ Regexp

Returns expression to find operator in string.

Returns:

  • (Regexp) —

    expression to find operator in string



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# File 'lib/re_dux/evaluate/operator.rb', line 82

def regexp
  nodes.find do |n|
    return Regexp.new(n.text) if %w(regexp symbol ).include?(n.name)
  end
  # TODO exception here?
end

#reverse ⇒ Object 



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# File 'lib/re_dux/evaluate/operator.rb', line 48

def reverse
  nodes.find do |n|
    return @logic[n.text] if n.name == 'reverse'
  end
  nil
end

#right_associative? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/re_dux/evaluate/operator.rb', line 16

def right_associative?
  nodes.find do |n|
    return n.text == 'true' if n.name == 'right_associative'
  end
  false
end

#ruby ⇒ String

Returns name of ruby method corresponding to this operator.

Returns:

  • (String) —

    name of ruby method corresponding to this operator



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# File 'lib/re_dux/evaluate/operator.rb', line 24

def ruby
  nodes.find do |n|
    return n.text if n.name == 'ruby'
  end
  symbol
end

#symbol ⇒ String

Returns literal for operator e.g. ‘+’.

Returns:

  • (String) —

    literal for operator e.g. ‘+’

Raises:

  • (Exception) 


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# File 'lib/re_dux/evaluate/operator.rb', line 32

def symbol
  return nil unless self.respond_to?(:nodes)
  nodes.find do |n|
    return n.text if n.name == 'symbol'
  end
  raise Exception
end

#to_s ⇒ Object 



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# File 'lib/re_dux/evaluate/operator.rb', line 70

def to_s
  symbol
end