Class: Glimmer::Calculator::Command::Operation

Inherits:
Glimmer::Calculator::Command show all
Defined in:
lib/models/glimmer/calculator/command/operation.rb,
lib/models/glimmer/calculator/command/operation/add.rb,
lib/models/glimmer/calculator/command/operation/divide.rb,
lib/models/glimmer/calculator/command/operation/multiply.rb,
lib/models/glimmer/calculator/command/operation/subtract.rb

Direct Known Subclasses

Add, Divide, Multiply, Subtract

Defined Under Namespace

Classes: Add, Divide, Multiply, Subtract

Instance Attribute Summary

Attributes inherited from Glimmer::Calculator::Command

#button, #result

Instance Method Summary collapse

Methods inherited from Glimmer::Calculator::Command

#command_history, command_history, for, #initialize, keyword, keyword_to_command_class_mapping, keywords, #last_command, #last_result, #number1, #number1=, #number2, #number2=, #operation, #operation=

Constructor Details

This class inherits a constructor from Glimmer::Calculator::Command

Instance Method Details

#calculate ⇒ Object 



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# File 'lib/models/glimmer/calculator/command/operation.rb', line 15

def calculate
  calculation_result = BigDecimal.new(number1.to_s).send(operation_method, BigDecimal.new(number2.to_s)).to_s('F')
  calculation_result.match(/\.0+$/) ? calculation_result.to_i : calculation_result
end

#execute ⇒ Object 



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# File 'lib/models/glimmer/calculator/command/operation.rb', line 5

def execute          
  if number1 && number2 && operation && !last_command.equals?
    self.result = operation.calculate.to_s            
    self.number1 = self.result
  else
    self.result = last_result || '0'
    self.operation = self
  end
end

#operation_method ⇒ Object

Subclasses must implement to indicate operation method on number (e.g. :+ for addition)



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# File 'lib/models/glimmer/calculator/command/operation.rb', line 21

def operation_method
  raise 'Not implemented!'
end