[ruby-core:42184] Re: YAML flow-collection: is "," a valid separator, or only ", " or " ," ?

On Fri, Jan 20, 2012 at 01:47:24AM +0900, j.wuttke wrote:
> From my understanding of the YAML spec, rule 138,
> "[0,1,2]" should be a valid array; but under both
> Ruby1.8 and Ruby1.9.3 it is parsed as [0]; to obtain
> [0,1,2] I need to write "[0, 1, 2]".

This appears to be a bug in Syck.  If you install libyaml and recompile
1.9.3, your yaml back end should be Psych.  Psych handles this case
correctly.

With trunk ruby (though 1.9.3 should work if you have libyaml
installed):

    irb(main):001:0> RUBY_VERSION
    =3D> "2.0.0"
    irb(main):002:0> require 'yaml'
    =3D> true
    irb(main):003:0> YAML.load "[0,1,2]"
    =3D> [0, 1, 2]
    irb(main):004:0>

With 1.8.7:

    >> RUBY_VERSION
    =3D> "1.8.7"
    >> require 'yaml'
    =3D> false
    >> YAML.load "[0,1,2]"
    =3D> [10]
    >>

You can verify the back end you're using via `YAML::ENGINE.yamler`:

    irb(main):004:0> YAML::ENGINE.yamler
    =3D> "psych"
    irb(main):005:0>

Or if you're targeting 1.9.2 and above, just require and use Psych directly:

    irb(main):001:0> require 'psych'
    =3D> true
    irb(main):002:0> Psych.load "[0,1,2]"
    =3D> [0, 1, 2]
    irb(main):003:0>

Hope that helps.

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