Module: Filtration

Included in:
Object
Defined in:
lib/filtration.rb

Instance Method Summary collapse

Instance Method Details

#postfilter(target, filter = nil, &block) ⇒ Object

for method, ‘target’, intercept output and apply method ‘filter’ or passed ‘block’ to it before returning the value



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# File 'lib/filtration.rb', line 23

def postfilter(target, filter=nil, &block)
  old_method = instance_method(target)
  raise "Must use either passed filter method or passed block" unless filter.nil? ^ block.nil?

  define_method(target) do |*args|
    if filter.nil?
      block.call(old_method.bind(self).call(*args))
    else
      filter_method = method(filter)
      raise "Filter method #{filter} takes 0 arguments" if filter_method.arity == 0
      self.send(filter,old_method.bind(self).call(*args))
    end
  end
end

#prefilter(target, filter = nil, &block) ⇒ Object

for method with arity > 0, ‘target’, intercept arguments and apply method ‘filter’ or passed ‘block’ to them before running ‘target’ with them



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# File 'lib/filtration.rb', line 5

def prefilter(target, filter=nil, &block)
  old_method = instance_method(target)
  raise "Method #{target} takes 0 arguments" if old_method.arity == 0
  raise "Must use either passed filter method or passed block" unless filter.nil? ^ block.nil?

  define_method(target) do |*args|
    if filter.nil?
      old_method.bind(self).call(block.call(*args))
    else
      filter_method = method(filter)
      raise "Filter method #{filter} takes 0 arguments" if filter_method.arity == 0
      old_method.bind(self).call(self.send(filter,*args))
    end
  end
end