Class: NilClass

Inherits:
Object show all
Defined in:
lib/ext/nil.rb

Constant Summary collapse

MOBJ_NULL_REGION_BEGIN = 
__LINE__
MOBJ_NULL_REGION_END = 
__LINE__

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object 



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# File 'lib/ext/nil.rb', line 44

def method_missing(name, *args, &block)
  if null?
    self
  else
    nil!
    super
  end
end

Instance Method Details

#__mobj__caller ⇒ Object 



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# File 'lib/ext/nil.rb', line 6

def __mobj__caller()
  caller.find do |frame|
    (file, line) = frame.split(":")
    file != __FILE__ || !(MOBJ_NULL_REGION_BEGIN..MOBJ_NULL_REGION_END).cover?(line.to_i)
  end
end

#attempt(value = true) ⇒ Object 



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# File 'lib/ext/nil.rb', line 57

def attempt(value=true)
  Forwarder.new do |name, *args, &block|
    if self.methods(true).include? name
      self.__send__(name, *args, &block)
    elsif value.is_a?(Proc)
      value.call([name] + args, &block)
    elsif value.is_a?(Hash) && value.ki?(name)
      value[name].when.is_a?(Proc).call(*args, &block)
    else
      value
    end
  end
end

#fals?(val = nil, &block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ext/nil.rb', line 21

def fals?(val=nil, &block)
  if block
    block.call(val)
  else
    val
  end
end

#nil! ⇒ Object 



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# File 'lib/ext/nil.rb', line 39

def nil!(*)
  @@null = nil
  self
end

#null! ⇒ Object Also known as: try? 



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# File 'lib/ext/nil.rb', line 34

def null!(*)
  @@null = __mobj__caller
  self
end

#null? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ext/nil.rb', line 29

def null?(*)
  @@null ||= nil
  @@null && @@null == __mobj__caller
end

#tru?(_ = nil, f = nil, &block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ext/nil.rb', line 17

def tru?(_=nil, f=nil, &block)
  f
end

#zero? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ext/nil.rb', line 13

def zero?
  true
end