module DR::MetaModule
helping with metaprograming facilities usage: Module Foo; extend DR::MetaModule
; include_complete Ploum; end
Public Instance Methods
essentially like define_method, but can pass a Method or an UnboundMethod see also dr/core_ext which add UnboundMethod#to_proc so we could instead use define_method(name,&method) and it would work
# File lib/dr/ruby_ext/meta_ext.rb, line 172 def add_method(name=nil,method) name=method.name unless name name=name.to_sym #if we have a (bound) method, we can convert it to a proc, but the #'self' inside it keeps being the 'self' of the original object (even #in instance_eval). #Since usually we'll want to change the self, it's better to unbind it method=method.unbind if method.class==Method case method when UnboundMethod #here the block passed is evaluated using instance_eval, so self is the #object calling, not the current module define_method name do |*args,&block| method.bind(self).call(*args,&block) end else #if method is a block/Proc, this is the same as define_method(name,method) define_method(name,&method) end end
add_methods
(method1, method2, …) add_methods
({name1: method1, name2: method2, …}) add_methods
(aClass, :method_name1, :method_name2) add_methods
(aClass, {new_name1: :method_name1, new_name2: :method_name2})
# File lib/dr/ruby_ext/meta_ext.rb, line 197 def add_methods(*args) return if args.empty? if Module === args.first mod=args.shift #we include methods from mod, the arguments should be method names if args.size == 1 and Hash === args.first #we have a hash {new_name => old_name} args.first.each do |k,v| add_method(k,mod.instance_method(v.to_sym)) end else args.each do |m| add_method(mod.instance_method(m.to_sym)) end end else if args.size == 1 and Hash === args.first #we have a hash {new_name => method} args.first.each do |k,v| add_method(k,v) end else args.each do |m| add_method(m) end end end end
module Z
def x; "x"; end
end module Enumerable
extend MetaModule full_include Z
end Array.new.x => “x”
# File lib/dr/ruby_ext/meta_ext.rb, line 159 def full_include other include other if self.class == Module this = self ObjectSpace.each_object Module do |mod| mod.send :include, this if mod < self end end end
# File lib/dr/ruby_ext/meta_ext.rb, line 144 def include_all_ancestors(obj) ancestors=Meta.all_ancestors(obj) ancestors.reverse.each do |m| include m if m.class==Module end end
include_ancestor includes all modules ancestor, so one can do singleton_class.include_ancestors(String) to include the Module ancestors of String into the class
# File lib/dr/ruby_ext/meta_ext.rb, line 137 def include_ancestors(m) ancestors=m.respond_to?(:ancestors) ? m.ancestors : m.singleton_class.ancestors ancestors.reverse.each do |m| include m if m.class==Module end end
When included/extended (according to :hooks, add the following instance and class methods)
# File lib/dr/ruby_ext/meta_ext.rb, line 115 def includes_extends_host_with(instance_module=nil, class_module=nil, hooks: [:included,:extended]) @_include_module ||= [] @_extension_module ||= [] @_include_module << instance_module @_extension_module << class_module hooks.each do |hook| define_singleton_method hook do |base| #we use send here because :include is private in Module @_include_module.each do |m| m=const_get(m) if ! Module===m base.send(:include, m) end @_extension_module.each do |m| m=const_get(m) if ! Module===m base.extend(m) end end end end