# coding: utf-8
# [debug] check nil arguments, reject them if needed
module NilArgs
Module.include self
NilArgsHookedMethods = {}
def nilargs sym
old = instance_method sym
NilArgsHookedMethods[self] ||= {}
raise NameError if NilArgsHookedMethods[self][sym]
NilArgsHookedMethods[self][sym] = true
define_method sym do |*args, &blk|
if args.any?(&:nil?)
call = "#{self}.#{sym}(#{args.map(&:inspect).join(', ')})"
puts "[debug#nilargs] #{call}"
else
old.bind(self).call(*args, &blk)
end
end
rescue
old = method sym
define_singleton_method sym do |*args, &blk|
if args.any?(&:nil?)
call = "#{self}.#{sym}(#{args.map(&:inspect).join(', ')})"
puts "[debug#nilargs] #{call}"
else
old.call(*args, &blk)
end
end
end
end
class A
nilargs def self.add(a, b)
a + b
end
nilargs def add(a, b)
a + b
end
end
A.new.add 1, nil # [debug#nilargs] #<A:0x00000000050ae100>.add(1, nil)
A.add nil, 2 # [debug#nilargs] A.add(nil, 2)
