Class: Loverload::Method

Inherits:
Object
  • Object
show all
Defined in:
lib/loverload/method.rb

Instance Method Summary collapse

Constructor Details

#initialize(klass, method_name, &with_params_block) ⇒ Method

Returns a new instance of Method.



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# File 'lib/loverload/method.rb', line 3

def initialize klass, method_name, &with_params_block
  @klass       = klass
  @method_name = method_name
  instance_eval(&with_params_block)
end

Instance Method Details

#overload(instance, *args) ⇒ Object 



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# File 'lib/loverload/method.rb', line 24

def overload instance, *args
  default      = "__#{ @method_name }_#{ args.size }"
  method_name  = "__name_#{ default }_#{ type_signature(args.map(&:class)) }"
  method_alias = "__alias_#{ default }_#{ alias_signature(args.map(&:class)) }"

  if instance.respond_to? method_name, true
    instance.send method_name, *args
  elsif instance.respond_to? method_alias, true
    instance.send method_alias, *args
  elsif instance.respond_to? default, true
    instance.send default, *args
  else
    raise NoMethodError, "Undefined method '#{ @method_name }' for #{ type_signature(args.map(&:class)) }"
  end
end

#with_params(*pars, &block) ⇒ Object 



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# File 'lib/loverload/method.rb', line 9

def with_params *pars, &block
  default      = "__#{ @method_name }_#{ block.arity }"
  method_name  = "__name_#{ default }_#{ type_signature(pars) }"
  method_alias = "__alias_#{ default }_#{ alias_signature(pars) }"

  @klass.define_method method_name do |*args|
    instance_exec(*args, &block)
  end

  @klass.send :alias_method, method_alias, method_name
  @klass.send :alias_method, default, method_name

  [default, method_name, method_alias].each{ |m| @klass.send :private, m }
end