Module: Kernel

Defined in:
lib/intercepted.rb

Overview

System module.

Instance Method Summary collapse

Instance Method Details

#intercepted(origin = nil) ⇒ Object 



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# File 'lib/intercepted.rb', line 8

def intercepted(origin = nil)
  raise 'Block is expected by intercepted()' unless block_given?

  Class.new(BasicObject) do
    define_method(:initialize) { @o = origin }
    define_method(:method_missing) do |mtd, *args, &block|
      yield(:before, mtd, args)
      params = @o.method(mtd).parameters
      reqs = params.count { |p| p[0] == :req }
      maybe = i[key keyreq]
      r =
        if params.any? { |p| maybe.include?(p[0]) } && args.size > reqs
          @o.__send__(mtd, *args[0..-2], **args.last) do |*a|
            block&.call(*a)
          end
        else
          @o.__send__(mtd, *args) do |*a|
            block&.call(*a)
          end
        end
      yield(:after, mtd, args, r)
      r
    end
    define_method(:respond_to?) do |mtd, include_private = false|
      @o.respond_to?(mtd, include_private)
    end
  end.new
end