Contents

# 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+
#

class CodeNameLookupInstruction < Instruction  # was Push3 CODE.DEFINITION
  def preconditions?
    needs :name, 1
  end
  def setup
    @the_reference = @context.pop_value(:name)
  end
  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
  def cleanup
    pushes :code, @result
  end
end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
nudge-0.2.9	lib/instructions/code/code_name_lookup.rb
nudge-0.2.8	lib/instructions/code/code_name_lookup.rb
nudge-0.2.7	lib/instructions/code/code_name_lookup.rb