Class: Noofakku::ClosedBracket

Inherits:
Object
  • Object
show all
Defined in:
lib/noofakku/instruction/closed_bracket.rb

Instance Method Summary collapse

Constructor Details

#initialize(open, closed) ⇒ ClosedBracket

Returns a new instance of ClosedBracket.



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# File 'lib/noofakku/instruction/closed_bracket.rb', line 5

def initialize(open, closed)
  @open, @closed = open, closed
end

Instance Method Details

#perform(processor, memory, program, input, output) ⇒ Object 



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# File 'lib/noofakku/instruction/closed_bracket.rb', line 9

def perform(processor, memory, program, input, output)
  raise "processor cannot be nil" unless processor != nil
  raise "memory cannot be nil" unless memory != nil
  raise "program cannot be nil" unless program != nil
  raise "instruction pointer must point to a '#{@closed}'" unless program[processor.instruction_pointer] == @closed
  if memory[processor.data_pointer] == 0 then return end
  unmatched_brackets = 1
  pointer_to_current_instruction = processor.instruction_pointer
  until unmatched_brackets == 0
  	processor.instruction_pointer -= 1
  	if processor.instruction_pointer == -1 then raise "no matching '#{@open}' for '#{@closed}' at #{pointer_to_current_instruction}"
  	elsif program[processor.instruction_pointer] == @closed then unmatched_brackets += 1
  	elsif program[processor.instruction_pointer] == @open then unmatched_brackets -= 1
    end
  end
end