On Mon, Mar 4, 2013 at 7:36 PM, Frederick Cheung <[email protected]
> wrote:
> On Monday, March 4, 2013 12:59:23 PM UTC, Nicolas Desprès wrote:
> > Hi,
> >
> >
> > Constraints:
> > - The "id" function has to call "integer" and not "store_result" because
> it may be defined as a plugin.
> > - The functions must still raise ArgumentError as they already do.
> >
> >
>
> Could you give some examples of what you're trying to do or problems
> you've run into? You've posted some code but haven't described how you'll
> be using it and in what way it isn't adequate.In fewer words: I don't see
> what your question is.
>
Thanks for replying.
Yes sorry. I realize that some context is missing.
# I am writing an API where the users are allowed to write something like
that:
FooContextWithName.new.eval do |o|
o.integer "id", an_option: true # [1]
o.integer "foo", an_option: true # [2]
o.bar "a_name" do |o|
o.integer an_option: true # [3]
end
end
# I would like that users are able to factor [1] and [2] by writing a small
plugin like this:
module MyHelpers
def id(name = "id")
integer name, an_option: true
end
end
MyLib.add_helpers(MyHelpers) # add_helpers would be defined appropriately
# To factor [3] users should be able to write something like that:
module MyHelpers
def id
integer an_option: true
end
end
# To implement this API I have something like this
module DefWithName
def integer(name, options = {})
store_result name, MyInteger.new(options)
end
end
module DefWithoutName
def integer(options = {})
store_result MyInteger.new(options)
end
end
class FooWithName < BasicObject
include DefWithName
def store_result(name, object)
@props[name] = object
end
end
class BarWithoutName < BasicObject
include DefWithoutName
def store_result(object)
@items << object
end
end
===========================
My goal is to provide a way for users to write their "id" method once and
to work in both cases.
I am thinking about something like that:
def id(*args)
if name_required?
name = name_given? ? given_name : "id"
end
integer name, an_option: true
end
def integer(*args)
value = MyInteger.new(options)
if name_required?
if name_given?
store_result given_name, value
else
raise ArgumentError
end
else
if name_given?
raise ArgumentError
end
store_result value
end
end
where "name_required?", "given_name" and "name_given?" would be defined
appropriately based on the arguments passed to the method.
I hope this is clearer now.
--
Nicolas Desprès
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