From: why the lucky stiff <ruby-talk@...>
Date: 2004-10-13T03:03:09+09:00
Subject: Re: YAML: Integers in YPATH

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James F. Hranicky wrote:

>    % ruby /tmp/x.rb /tmp/x.yaml 1
>    []
>    % ruby /tmp/x.rb /tmp/x.yaml x2
>    [{"Name"=>"myserv", "Arch"=>"x86", "OS"=>"linux", "Ether"=>2}]
>
>Is there any way to get the select to work without changing the 1
>to "1" or using !str every time?
>  
>
I'm attaching one technique for turning off typing.  It looks like you 
found two bugs:
* YPath is trying to match against typed keys.  (All data should be 
untransformed in YAML::Syck::Nodes)
*  A bug exists in YAML::Syck::Node#transform.  Use 
YAML::Syck::Node#select! for now, which transforms the results of a 
YPath query.

_why


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require 'yaml'
class YAML::Syck::Node
    alias _transform transform
    def transform
        case @kind
        when :scalar
            @value
        when :seq
            @value.collect do |v|
                v.transform
            end
        when :map
            hsh = {}
            @value.each do |k, v|
                hsh[v[0].transform] = v[1].transform
            end
            hsh
        end
    end
    def at( seg )
        if Hash === @value
            k, v = @value.values.detect { |x| x[0].transform == seg }
            v
        elsif Array === @value and seg =~ /\A\d+\Z/ and @value[seg.to_i]
            @value[seg.to_i]
        end
    end
end

y = File.open(ARGV.shift).read
node = ARGV.shift
p YAML.parse(y).select!("/Domains/*/Networks/*/Hosts/1")
p YAML.parse(y).transform

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