From: brabuhr@...
Date: 2010-11-21T06:39:39+09:00
Subject: Re: Comparing XML documents

On Sat, Nov 20, 2010 at 5:17 AM, Toby Rodwell <trodwell@iee.org> wrote:
> I'd like to check the equivalence of two XML documents.  Searching this
> forum I found some short and elegant code, but it considered docs
> unequal if their elements were in a different order.  Any
> suggestions/advice?  Thanks in advance.

require 'active_support'
require 'active_support/xml_mini'
require 'active_support/core_ext/hash'

doc1 = Hash.from_xml <<END
  <foo>
    <bar>1</bar>
    <bar>2</bar>
  </foo>
END

doc2 = Hash.from_xml <<END
  <foo>
    <bar>1</bar>
    <bar>2</bar>
  </foo>
END

# assert_equal doc1, doc2
#=> pass

doc3 = Hash.from_xml <<END
  <foo>
    <bar>2</bar>
    <bar>1</bar>
  </foo>
END

# assert_equal doc1, doc3
#=> fail

def foo thing
  case thing
  when Hash
    thing.each{|_, t| foo t}
  when Array
    thing.sort!
    thing.each{|t| foo t}
  end
end

# assert_equal doc1, foo(doc3)
#=> true