[study] Method's parameters validation

method_params_validation.rb

module ValidatableMethods
  def self.included(base)
    base.extend ClassMethods
  end

  module ClassMethods
    def validated(method_name, &block)
      mod = Module.new
      mod.define_method(method_name) do |*args, **kwargs|
        begin
          yield(*args, **kwargs)
          super(*args, **kwargs)
        rescue NoMatchingPatternError, ArgumentError => e
          message = "Invalid argument for method #{method_name}: #{e.message} in #{e.backtrace.first}"
          # Print for experimenting purpose, but the exception should be re-raised
          p message
          # raise ArgumentsValidationError.new(message)
        end

      end

      instance_method(method_name).owner.prepend(mod)
    end
  end

  class ArgumentsValidationError < StandardError; end
end

class Foo
  include ValidatableMethods

  validated def kwargs_only(a:, b:)
    p "Success! Your params are: #{a}, #{b}"
  end do |**kwargs| kwargs => {a: Integer, b: Array[String, Symbol]} end

  validated def positional_only(a, b)
    p "Success! Your params are: #{a}, #{b}"
  end do |*args| args => [Integer, Array[String, Symbol]] end

  validated def mixed(a, b:)
    p "Success! Your params are: #{a}, #{b}"
  end do |*args, **kwargs|
    args => [Integer]
    kwargs => {b: Array[Integer, String]}
  end
end

obj = Foo.new

obj.kwargs_only
obj.kwargs_only 1, 2
obj.kwargs_only 1, [2, 'three']
obj.kwargs_only '1', ['2', :three]
obj.kwargs_only 1, ['2', :three]
obj.kwargs_only a: '1', b: 2
obj.kwargs_only a: 1, b: [2, 'three']
obj.kwargs_only a: 1, b: ['2', :three]
obj.positional_only
obj.positional_only 1, 2
obj.positional_only 1, [2, 'three']
obj.positional_only '1', ['2', :three]
obj.positional_only 1, ['2', :three]
obj.positional_only a: '1', b: 2
obj.positional_only a: 1, b: [2, 'three']
obj.positional_only a: 1, b: ['2', :three]
obj.mixed
obj.mixed 1, 2
obj.mixed 1, [2, 'three']
obj.mixed '1', ['2', :three]
obj.mixed 1, ['2', :three]
obj.mixed a: '1', b: 2
obj.mixed 1, b: [2, 'three']
obj.mixed 1, b: ['2', :three]

# binding.irb