Class: Brainfuck::Runtime

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Runtime

Returns a new instance of Runtime.



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# File 'lib/lang/runtime.rb', line 3

def initialize
  @cells = [0]
  @current_cell = 0
end

Instance Method Details

#mutate(how) ⇒ Object 



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# File 'lib/lang/runtime.rb', line 23

def mutate(how)
  case how
  when :incr
    @cells[@current_cell] += 1
  when :decr
    @cells[@current_cell] -= 1
  end
end

#shift(direction) ⇒ Object 



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# File 'lib/lang/runtime.rb', line 8

def shift(direction)
  case direction
  when :right
    @current_cell += 1
    if @current_cell > @cells.length - 1
      @cells << 0
    end
  when :left
    @current_cell -= 1
    if @current_cell < 0
      @current_cell = 0
    end
  end
end

#value ⇒ Object 



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# File 'lib/lang/runtime.rb', line 32

def value
  @cells[@current_cell]
end

#value=(value) ⇒ Object 



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# File 'lib/lang/runtime.rb', line 36

def value=(value)
  @cells[@current_cell] = value
end