Module: ShoveInstruction

Included in:
BoolShoveInstruction, CodeShoveInstruction, ExecShoveInstruction, FloatShoveInstruction, IntShoveInstruction, NameShoveInstruction
Defined in:
lib/instructions/infrastructure.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#target_stack ⇒ Object (readonly)

Returns the value of attribute target_stack.



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# File 'lib/instructions/infrastructure.rb', line 260

def target_stack
  @target_stack
end

Instance Method Details

#cleanup ⇒ Object 



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# File 'lib/instructions/infrastructure.rb', line 293

def cleanup
  @context.stacks[@target_stack].entries.insert(@new_depth,@result)
end

#derive ⇒ Object 



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# File 'lib/instructions/infrastructure.rb', line 281

def derive
  max = @context.stacks[@target_stack].depth
  case 
  when @how_far <= 0
    @new_depth = max
  when @how_far > max
    @new_depth = 0
  else
    @new_depth = max - @how_far
  end
end

#initialize(context, target_stack) ⇒ Object 



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# File 'lib/instructions/infrastructure.rb', line 262

def initialize(context, target_stack)
  @target_stack = target_stack
  super(context)
end

#preconditions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/instructions/infrastructure.rb', line 267

def preconditions?
  if @target_stack != :int
    needs :int, 1
    needs @target_stack, 1
  else
    needs :int, 2
  end
end

#setup ⇒ Object 



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# File 'lib/instructions/infrastructure.rb', line 276

def setup
  @how_far = @context.pop_value(:int)
  @result = @context.pop(@target_stack)
end