From: Aaron Patterson <tenderlove@...>
Date: 2012-08-09T02:58:45+09:00
Subject: [ruby-core:47078] Re: [ruby-trunk - Feature #6840] YAML tag method


--UugvWAfsgieZRqgk
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Wed, Aug 08, 2012 at 09:52:15PM +0900, trans (Thomas Sawyer) wrote:
>=20
> Issue #6840 has been updated by trans (Thomas Sawyer).
>=20
>=20
> As I stated before, for my use case, I do *not* want users to use a suppo=
rt library. In fact, it's not just want, its a requirement. This format mus=
t be inter-operable. It doesn't mater if the user is programming in Perl, P=
ython, Javascript or any other language. They need to be able to access the=
 information just as readily. I'm not about to write a library for each pos=
sible language. The same holds for Ruby.
>=20
> The "foo" type is a very specific YAML specification. If the user simply =
knows the name and version of the spec then they know what to expect. That'=
s the most important thing. Any "Foo" library I write to support "foo" is j=
ust a convenience if it suites the purposes of the specifications user. But=
 usually it will not, and should not.=20
>=20
> But this isn't really about my specific use case. There is a more fundame=
ntal issue here. Having to define a global handler upfront makes it impossi=
ble to handle the incoming information dynamically. It is one thing to make=
 something difficult, it's another to make it impossible.

You're welcome to access the AST and translate yourself:

    require 'psych'
   =20
    Psych.parse_stream("---\n- !foo/2 omg\n- zomg") do |ast|
      ast.each do |node|
        if node.tag
          p [:tag, node.tag, node.to_ruby]
        else
          p [node.class, :notag, node.to_ruby]
        end
      end
    end

You can be as dynamic as you want here.

> I realize it sucks to add core methods, but in this case its really a fea=
ture that's needed.

Sorry, I'm not convinced.

--=20
Aaron Patterson
http://tenderlovemaking.com/

--UugvWAfsgieZRqgk
Content-Type: application/pgp-signature

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (Darwin)

iQEcBAEBAgAGBQJQIqjJAAoJEJUxcLy0/6/GFL4IAJn7vGh6cFnKwUGsTYxDUZ2n
3VlNoxn3CuFNzJ2rIXYfwnl/ciTVUKlD4BovHx2qFaUZt7XP10yiB6DjAjg4MCLa
5fcmYH/PlMMj3EJOeBuR43s35zUeKPvPCvikssmz4BZSeUU+S0MB8GA2aSKy9wFh
R0osA6ETQxw0aigSXc6w9JQYoAzQ15mnF8AA6wrCd6in1+Uv68l3o04JOLhXt0OX
7+etzqc+bUSV0ugOh9KUtJ4gmP7utfr+Ku5tr/f40v7l5rt7vdXQ7DB/Yum7OPaK
iadQGQ9/cxacJV+ghvohg3PtrLu1CeHfpR6wG3QYjQtqYPpYJNycBzLdfM0fFmA=
=01HA
-----END PGP SIGNATURE-----

--UugvWAfsgieZRqgk--