Class: CodeNameLookupInstruction

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

Overview

pops the top :name item; pushes a new :code item that has a value equal to the current context binding

note: if there is no binding, the resulting :code value will be an empty string

needs: 1 :name

pushes: 1 :code

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_name_lookup.rb', line 26

def cleanup
  pushes :code, @result
end

#derive ⇒ Object 



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# File 'lib/instructions/code/code_name_lookup.rb', line 18

def derive
  bound_value = @context.variables[@the_reference] || @context.names[@the_reference] || nil
  if bound_value != nil
    @result = ValuePoint.new("code", bound_value.blueprint)
  else
    @result = ValuePoint.new("code", "")
  end
end

#preconditions? ⇒ Boolean

was Push3 CODE.DEFINITION

Returns:

  • (Boolean) 


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# File 'lib/instructions/code/code_name_lookup.rb', line 12

def preconditions?
  needs :name, 1
end

#setup ⇒ Object 



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# File 'lib/instructions/code/code_name_lookup.rb', line 15

def setup
  @the_reference = @context.pop_value(:name)
end