Make Ruby's Builder default XML data to CDATA and not bork numbers.

builder_default_cdata.rb

# Make Builder default to CDATA and not bork numbers.
# By Henrik Nyh <http://henrik.nyh.se> 2009-08-07 under the MIT license.

require "rubygems"
require "builder"

xml_1 = Builder::XmlMarkup.new
xml_2 = Builder::XmlMarkup.new

# Override Builder so CDATA is used by default to escape text, and with no whitespace
# around it. Doesn't bork numbers like _cdata!_ does.
def xml_2._escape(text)
  (text && caller[1].inspect.include?(%{`method_missing'})) ? "<![CDATA[#{text}]]>" : text
end

puts xml_1.Foo "bar & baz"  # => <Foo>bar &amp; baz</Foo>
puts xml_2.Foo "bar & baz"  # => <Foo><![CDATA[bar & baz]]></Foo>