Module: Invokable::ClassMethods

Defined in:
lib/invokable.rb

Overview

Note:

The module should not be used directly.

The methods that are mixed into any class at the class level that includes Invokable.

Instance Method Summary collapse

Instance Method Details

#arity ⇒ Integer

Return the “total” arity of the class (i.e. the arity of the initializer and the arity of the call method)

Returns:

Version:

  • 0.6.0



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# File 'lib/invokable.rb', line 52

def arity
  return initializer_arity + invoker_arity if invoker_arity >= 0

  (initializer_arity + invoker_arity.abs) * -1
end

#call(*args) ⇒ Object

Handle automatic currying–will accept either the initializer arity or the total arity of the class. If the initializer arity is used return a class instance. If the total arity is used instantiate the class and return the results of the call method.

Raises:

See Also:

Version:

  • 0.6.0



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# File 'lib/invokable.rb', line 65

def call(*args)
  raise ArgumentError, "variable length initializer methods are not supported by Invokable" if initializer_arity < 0

  return new.call        if arity.zero?
  return new(*args).call if args.length == initializer_arity && (invoker_arity.zero? || invoker_arity == -1)
  return new(*args)      if args.length == initializer_arity

  if args.length == arity || invoker_arity < 0 && (args.length - initializer_arity) >= (invoker_arity.abs - 1)
    init_args = args.slice(0, initializer_arity)
    call_args = args.slice(initializer_arity, args.length)
    new(*init_args).call(*call_args)
  else
    raise ArgumentError, "wrong number of arguments (given #{args.length}, expected #{initializer_arity} or #{arity})"
  end
end

#initializer_arity ⇒ Object 



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# File 'lib/invokable.rb', line 81

def initializer_arity
  instance_method(:initialize).arity
end

#invoker_arity ⇒ Object 



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# File 'lib/invokable.rb', line 85

def invoker_arity
  instance_method(:call).arity
end