Class: Nil::NilCommands

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(code, mode = 'ascii') ⇒ NilCommands

Returns a new instance of NilCommands.



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# File 'lib/nil/nil_commands.rb', line 7

def initialize(code, mode = 'ascii')
  @sp = 0
  @stack = [0] * 10_000
  @code_pointer = 0
  @loop_begin_pointer = 0
  @loop_end_pointer = 0

  @code = code
  @mode = mode
end

Instance Attribute Details

#code ⇒ Object (readonly)

Returns the value of attribute code.



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# File 'lib/nil/nil_commands.rb', line 3

def code
  @code
end

#code_pointer ⇒ Object (readonly)

Returns the value of attribute code_pointer.



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# File 'lib/nil/nil_commands.rb', line 3

def code_pointer
  @code_pointer
end

#loop_begin_pointer ⇒ Object (readonly)

Returns the value of attribute loop_begin_pointer.



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# File 'lib/nil/nil_commands.rb', line 3

def loop_begin_pointer
  @loop_begin_pointer
end

#loop_end_pointer ⇒ Object (readonly)

Returns the value of attribute loop_end_pointer.



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# File 'lib/nil/nil_commands.rb', line 3

def loop_end_pointer
  @loop_end_pointer
end

#mode ⇒ Object (readonly)

Returns the value of attribute mode.



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# File 'lib/nil/nil_commands.rb', line 3

def mode
  @mode
end

#sp ⇒ Object (readonly)

Returns the value of attribute sp.



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# File 'lib/nil/nil_commands.rb', line 3

def sp
  @sp
end

#stack ⇒ Object (readonly)

Returns the value of attribute stack.



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# File 'lib/nil/nil_commands.rb', line 3

def stack
  @stack
end

Instance Method Details

#run ⇒ Object 



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# File 'lib/nil/nil_commands.rb', line 18

def run
  while @code_pointer <= code.size
    case code[@code_pointer]
    when '.'
      if @mode == 'num'
        puts @stack[@sp]
      else
        print @stack[@sp].chr
      end
    when ','
      if @mode == 'num'
        @stack[@sp] = gets[0].to_i
      else
        @stack[@sp] = gets[0].ord
      end
    when '+'
      @stack[@sp] += 1
    when '-'
      @stack[@sp] -= 1 unless @stack[@sp] == 0
    when '>'
      @sp += 1
    when '<'
      @sp -= 1
    when '['
      @loop_begin_pointer = @code_pointer

      if @stack[@sp] <= 0
        @code_pointer = @loop_end_pointer
      end
    when ']'
      @loop_end_pointer = @code_pointer
      @code_pointer = (@loop_begin_pointer - 1)
    end
    @code_pointer += 1
  end
end