Class: Romanesco::Operator

Inherits:
Expression show all
Defined in:
lib/romanesco/elements/operator.rb

Direct Known Subclasses

BinaryOperator, UnaryOperator

Instance Attribute Summary collapse

Attributes inherited from Expression

#parent

Instance Method Summary collapse

Methods inherited from Expression

#initialize

Constructor Details

This class inherits a constructor from Romanesco::Expression

Instance Attribute Details

#symbol ⇒ Object

Returns the value of attribute symbol.



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# File 'lib/romanesco/elements/operator.rb', line 6

def symbol
  @symbol
end

Instance Method Details

#check_for_blank_symbol ⇒ Object

Raises:



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# File 'lib/romanesco/elements/operator.rb', line 16

def check_for_blank_symbol
  raise NoSymbolError if @symbol.nil? || @symbol.gsub(/\s+/, '').empty?
end

#connect(last_operator, last_operand) ⇒ Object 



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# File 'lib/romanesco/elements/operator.rb', line 28

def connect(last_operator, last_operand)
  if last_operator && last_operator.is_a?(ParenthesesOperator) && last_operator.precedence > self.precedence
    connect_in_place(last_operator, last_operand)
  elsif last_operator && last_operator.is_a?(ParenthesesOperator) && self.is_a?(ParenthesesOperator)
    last_operator.connect_to_left(self)
  elsif last_operator && last_operator.parent && last_operator.precedence >= self.precedence
    connect_in_place_with_parent(last_operator, last_operand)
  elsif last_operator && last_operator.parent && last_operator.precedence < self.precedence
    connect_in_place_with_parent(last_operator, last_operand)
  elsif last_operator && last_operator.is_a?(ParenthesesOperator) && last_operator.precedence < self.precedence
    connect_up_tree(last_operator)
  elsif last_operator && last_operator.precedence >= self.precedence
    connect_up_tree(last_operator)
  elsif last_operator && self.is_a?(ParenthesesOperator)
    connect_to_right(last_operator)
  elsif last_operator
    connect_in_place(last_operator, last_operand)
  else
    connect_to_left(last_operand)
  end
end

#connect_in_place(last_operator, last_operand) ⇒ Object 



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# File 'lib/romanesco/elements/operator.rb', line 55

def connect_in_place(last_operator, last_operand)
  self.insert_element_to_left(last_operand)
  last_operator.insert_element_to_right(self)
end

#connect_in_place_with_parent(last_operator, last_operand) ⇒ Object 



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# File 'lib/romanesco/elements/operator.rb', line 50

def connect_in_place_with_parent(last_operator, last_operand)
  last_operator.parent.insert_element_to_right(self)
  self.insert_element_to_left(last_operand)
end

#connect_to_left(element) ⇒ Object 



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# File 'lib/romanesco/elements/operator.rb', line 64

def connect_to_left(element)
  self.insert_element_to_left(element)
end

#connect_to_right(element) ⇒ Object 



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# File 'lib/romanesco/elements/operator.rb', line 68

def connect_to_right(element)
  element.insert_element_to_right(self)
end

#connect_up_tree(last_operator) ⇒ Object 



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# File 'lib/romanesco/elements/operator.rb', line 60

def connect_up_tree(last_operator)
  self.insert_element_to_left(last_operator)
end

#default_precedence ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/romanesco/elements/operator.rb', line 24

def default_precedence
  raise NotImplementedError
end

#evaluate(options) ⇒ Object

Raises:

  • (NotImplementedError) 


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# File 'lib/romanesco/elements/operator.rb', line 8

def evaluate(options)
  raise NotImplementedError
end

#precedence ⇒ Object 



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# File 'lib/romanesco/elements/operator.rb', line 12

def precedence
  @precedence || default_precedence
end

#precedence=(value) ⇒ Object 



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# File 'lib/romanesco/elements/operator.rb', line 20

def precedence=(value)
  @precedence = value
end