Class: ExecEqualQInstruction

Inherits:
Instruction show all
Defined in:
lib/instructions/exec/exec_equal_q.rb

Overview

pops the top 2 items of the :exec stack; pushes a new ValuePoint onto the :bool stack, with value true if the two items’ blueprint strings are identical

needs: 2 :exec

pushes: 1 :bool

Instance Attribute Summary

Attributes inherited from Instruction

#context

Instance Method Summary collapse

Methods inherited from Instruction

all_instructions, #go, inherited, #initialize, #needs, #pushes, to_nudgecode

Constructor Details

This class inherits a constructor from Instruction

Instance Method Details

#cleanup ⇒ Object 



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# File 'lib/instructions/exec/exec_equal_q.rb', line 23

def cleanup
  pushes :bool, @result
end

#derive ⇒ Object 



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# File 'lib/instructions/exec/exec_equal_q.rb', line 18

def derive
  x1 = NudgeProgram.new(@arg1)
  x2 = NudgeProgram.new(@arg2)
  @result = ValuePoint.new("bool", x1.blueprint == x2.blueprint)
end

#preconditions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/instructions/exec/exec_equal_q.rb', line 11

def preconditions?
  needs :exec, 2
end

#setup ⇒ Object 



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# File 'lib/instructions/exec/exec_equal_q.rb', line 14

def setup
  @arg2 = @context.pop(:exec).blueprint
  @arg1 = @context.pop(:exec).blueprint
end