Class: CodeBackbonePointsInstruction

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

Overview

pops the top item from the :code stack; pushes an :int with the number of items in the root of the :code value

note: if the :code value does not parse, or is an atom (doesn’t parse into a CodeBlockPoint), the result is 0; if it is an empty block, it’s also 0

For example:

[1,2,[3,4],5] -> 4 backbone points
[[1,2,3,4,5]] -> 1 backbone point
[] -> 0 backbone points
1 -> 0 backbone points

needs: 1 :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_backbone_points.rb', line 38

def cleanup
  pushes :int, @result
end

#derive ⇒ Object 



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# File 'lib/instructions/code/code_backbone_points.rb', line 29

def derive
  if @parsed.parses?
    pts = @parsed.linked_code.kind_of?(CodeblockPoint) ? @parsed[1].contents.length : 0
  else
    pts = 0
  end
  @result = ValuePoint.new("int",pts)
end

#preconditions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/instructions/code/code_backbone_points.rb', line 20

def preconditions?
  needs :code, 1
end

#setup ⇒ Object 



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# File 'lib/instructions/code/code_backbone_points.rb', line 24

def setup
  arg_blueprint = @context.pop_value(:code)
  @parsed = NudgeProgram.new(arg_blueprint)
end