From: Devin Mullins <twifkak@...>
Date: 2006-12-12T23:20:40+09:00
Subject: Re: Non-useless mode for YAML::Syck::Map.children_with_index?

Phlip wrote:
 > Rubistas:
Ooh! I approve.

Err... you might wanna ask _why directly, or hop into the source. I got 
lost at the :seq part -- isn't that a Mapping, not a Sequence?

And FWIW, I got a, i from me_key.value when I ran it. So... order bad. I 
think if you care about order -- now's too late in the game.

irb(main):021:0* y.instance_variables.map {|f| [f, 
y.instance_variable_get(f)] }
=> [["@style", nil], ["@value", 
{#<YAML::Syck::Scalar:0x2e0f43c>=>#<YAML::Syck::
Scalar:0x2e0f48c>, 
#<YAML::Syck::Scalar:0x2e0f39c>=>#<YAML::Syck::Scalar:0x2e0f3
ec>}], ["@type_id", nil], ["@kind", :seq]]

Nothing about order there.

(If you have control over the YAML, don't use a mapping - the spec says 
order doesn't matter for mappings. A technique I use a lot is a list of 
singleton mappings:
- Foo: bar
- Fish: bileff
...)

Devin

> Here's a complete working sample illustrating the issue in YAML::Syck, or 
> its documentation:
> 
>     require 'yaml'
> 
>     y = YAML.parse("i: b\na: sequence")
>     p y.kind # <-- :seq
 > ...