Class: Nydp::ExecuteConditionalInstruction

Inherits:
Object
  • Object
show all
Extended by:
Helper
Defined in:
lib/nydp/cond.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Helper

cons, list, literal?, pair?, sym, sym?

Constructor Details

#initialize(when_true, when_false) ⇒ ExecuteConditionalInstruction

Returns a new instance of ExecuteConditionalInstruction.



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# File 'lib/nydp/cond.rb', line 6

def initialize when_true, when_false
  @when_true, @when_false = when_true, when_false
end

Instance Attribute Details

#when_false ⇒ Object (readonly)

Returns the value of attribute when_false.



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# File 'lib/nydp/cond.rb', line 4

def when_false
  @when_false
end

#when_true ⇒ Object (readonly)

Returns the value of attribute when_true.



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# File 'lib/nydp/cond.rb', line 4

def when_true
  @when_true
end

Instance Method Details

#execute(vm) ⇒ Object 



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# File 'lib/nydp/cond.rb', line 10

def execute vm
  arg = vm.pop_arg
  truth = !Nydp.NIL.is?(arg)
  vm.push_instructions (truth ? when_true : when_false), vm.peek_context
end

#inspect ⇒ Object 



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# File 'lib/nydp/cond.rb', line 16

def inspect
  "when_true:#{when_true.inspect}:when_false:#{when_false.inspect}"
end

#to_s ⇒ Object 



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# File 'lib/nydp/cond.rb', line 19

def to_s
  "#{when_true.car.to_s} #{when_false.car.to_s}"
end