Oren is correct of course, but this brings up 3 issues related to YAML2 to me.

The first is that this is a common problem in the YAML ecosystem. The various implementations have various incompatibilities. Implementations using libyaml are probably the most consistent, but even there there is room for error. libyaml is only parser/emitter, and is only 1.1 with some liberties taken by Kirill when the spec did not make sense. Most loader/dumpers are at least true to themselves. ie they can load what they dump. You should compare how psych and syck are dumping as well as loading...

The second is that we really need a common and growing test suite that can be run against all the implementations to see where they stand. A comparison chart would be a nice fallout. Like this one for Perl 6 http://perl6.org/compilers/features

Lastly, I think that YAML 2.0 should be a lot more forgiving. For instance, just because '%' is a directive indicator doesn't mean it needs quoted except in top level keys (beginning in column 1).

I plan to write some more 2.0 proposals this weekend that have been brewing lately.

Ingy

On Thu, Nov 24, 2011 at 8:16 AM, Oren Ben-Kiki <oren@ben-kiki.org> wrote:
% is an "indicator" character so it can't be the first in an unquoted (plain) scalar. Therefore syck is wrong in accepting it.

Have fun,

    Oren Ben-Kiki


On Thu, Nov 24, 2011 at 4:29 PM, j.wuttke <j.wuttke@fz-juelich.de> wrote:
Is this valid YAML:?

---
testtext: %
...

It is parsed without difficulty by Ruby1.8 (Syck based)
whereas it fails under Ruby1.9.1 (psych -> libyaml).

By the way, the web site yaml.org says psych is "in Ruby
core for 1.9.2". I suggest to correct this into "since 1.9.1".
(Or "since 1.9" ? I ignore whether it was present in 1.9.0)

- Joachim



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