Class: Nuffle::Calculator

Inherits:
Object
  • Object
show all
Defined in:
lib/nuffle.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input) ⇒ Calculator

Returns a new instance of Calculator.



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# File 'lib/nuffle.rb', line 15

def initialize(input)
  validate(input)
end

Instance Attribute Details

#equation ⇒ Object (readonly)

Returns the value of attribute equation.



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# File 'lib/nuffle.rb', line 10

def equation
  @equation
end

#input ⇒ Object (readonly)

Returns the value of attribute input.



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# File 'lib/nuffle.rb', line 10

def input
  @input
end

#result ⇒ Object (readonly)

Returns the value of attribute result.



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# File 'lib/nuffle.rb', line 10

def result
  @result
end

#rolls ⇒ Object (readonly)

Returns the value of attribute rolls.



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# File 'lib/nuffle.rb', line 10

def rolls
  @rolls
end

Instance Method Details

#calculate ⇒ Object 



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# File 'lib/nuffle.rb', line 19

def calculate
  # reset the rolls array
  @rolls = []

  # throw rolls and replace 'xdy' dice notation with results
  @equation = @input.gsub(/(\d+)d(\d+)/) do |match|
    rolls = []

    (1..$1.to_i).each do
      rolls << 1 + rand($2.to_i)
    end

    # save individual roll results
    @rolls << {
        'notation' => match,
        'rolls' => rolls
      }

    "(#{rolls.join(" + ")})"
  end

  # cast integers to floats
  equation = @equation.gsub(/\b(\d+)\b/) do |match|
    $1.to_f.to_s
  end

  # calculate result
  @result = eval(equation);

  # cast result to integer if a whole float
  @result = @result.to_i if @result % 1 == 0

  self
end