Class: CodeDiscrepancyInstruction

Inherits:
Instruction show all
Defined in:
lib/instructions/code/code_discrepancy.rb

Overview

pops the top 2 items of the :code stack; and compares their values algorithmically to obtain an :int value, which it pushes

The measure of discrepancy is determined by:

  1. first creating a list of every program point’s blueprint, for both :code values

  2. for every item in the union of these sets of blueprints, accumulate the absolute difference in the number of times the blueprint appears in each of the two items’ values

the resulting :int is pushed

needs: 2 :code

pushes: 1 :int

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/code/code_discrepancy.rb', line 32

def cleanup
  pushes :int, @result
end

#derive ⇒ Object 



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# File 'lib/instructions/code/code_discrepancy.rb', line 23

def derive
   # collect string blueprints of every point
  parts_of_1 = NudgeProgram.new(@arg1).linked_code.collect {|pt| pt.blueprint}
  parts_of_2 = NudgeProgram.new(@arg2).linked_code.collect {|pt| pt.blueprint}
  unique_parts = (parts_of_1.uniq + parts_of_2.uniq).reject {|i| i == ""}
  summed_differences = unique_parts.inject(0) {|sum, uniq_string| sum +
    (parts_of_2.count(uniq_string) - parts_of_1.count(uniq_string)).abs}
  @result = ValuePoint.new("int", summed_differences)
end

#preconditions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/instructions/code/code_discrepancy.rb', line 16

def preconditions?
  needs :code, 2
end

#setup ⇒ Object 



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# File 'lib/instructions/code/code_discrepancy.rb', line 19

def setup
  @arg2 = @context.pop_value(:code)
  @arg1 = @context.pop_value(:code)
end