Module: Kernel

Defined in:
lib/strokedb/core_ext/kernel.rb

Instance Method Summary collapse

Instance Method Details

#extract(*template_and_args) ⇒ Object

Helps to extract arguments for an overloaded methods:

def some_method(*args)
  store, name, options = extract(Store, String, Hash, args)
end

This method tries to extract arguments according to their type. If the correct type is missing, var is set to nil. If some of the input arguments are not matched, ArgumentError is raised.



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# File 'lib/strokedb/core_ext/kernel.rb', line 28

def extract(*template_and_args)
  args = template_and_args.pop
  result = []
      
  args.each do |a|
    unless while t = template_and_args.shift
      t === a and result.push a and break 1 or result.push nil
      end
      raise ArgumentError, "Unexpected argument #{a.inspect} is passed!"
    end
  end
  result + template_and_args.map{ nil }
end

#require_one_of(*args) ⇒ Object 



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# File 'lib/strokedb/core_ext/kernel.rb', line 2

def require_one_of(*args)
  if args.first.class == Array
    args = args.first
    original_args = args[1]
  end
  original_args ||= args
  
  begin
    require args.shift
  rescue LoadError
    raise LoadError, "You need one of these gems: #{original_args.join(', ')}" if
      args.empty?
    require_one_of(args, original_args)
  end
  
end