From: Joel VanderWerf <vjoel@...>
Date: 2006-12-09T11:57:00+09:00
Subject: Re: YAML extension not honouring the options passed to .to_yaml

Chad Thatcher wrote:
> As outlined on http://yaml4r.sourceforge.net/doc/ I triesd setting some
> options in the hash passed to .to_yaml and nothing seems to be making
> any difference:
> 
> 
> out_file.puts newmaster.to_yaml(:SortKeys => true)
> 
> newmaster is a hash and the output is definitely not being sorted.
> Unfortunately using newmaster.sort.to_yaml changes the structure of the
> yaml being output significantly (seeing as it is converted to and array
> of arrrays) and that is not desirable).  Can anyone shed some light on
> this?  I am using vanilla 1.8.4 install on windows and presumably the
> YAML.rb that shipped with that because I haven't installed anything
> separately.

:SortKeys isn't supported in 1.8.4. I don't know about more recent versions.

Here's the hack I use:

class Hash
   def to_yaml( opts = {} )
     YAML::quick_emit( object_id, opts ) do |out|
       out.map( taguri, to_yaml_style ) do |map|
#        if opts[:SortKeys] ## fails in nesting, so let's just always sort
           sorted_keys = keys
           sorted_keys = begin
             sorted_keys.sort
           rescue
             sorted_keys.sort_by {|k| k.to_s} rescue sorted_keys
           end

           sorted_keys.each do |k|
             map.add( k, fetch(k) )
           end
#        else
#          each do |k, v|
#            map.add( k, v )
#          end
#        end
       end
     end
   end
end


-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407