require "stringio"
require "rexml/document"
# only support string, array, object, no number
def hash_to_xml a, parent=REXML::Element.new('root')
case a
when String
parent.add_text a
when Array
parent, t = parent.parent, parent
parent.delete_element t
a.each { |e| hash_to_xml({ t.name => e }, parent) }
when Hash
a.each_pair { |k, v|
k = k.to_s
if k.start_with? ?-
parent.add_attribute k[1..-1], v
else
e = parent.add_element(k)
hash_to_xml v, e
end
}
end
return parent
end
def format_xml(xml)
StringIO.new.tap { |s|
REXML::Formatters::Pretty.new.yield_self { |f|
f.compact = true
f.write xml, s
}
}.string
end
root = {
'-a': "42", b: { "-c" => ?d },
es: { e: [{ '-f': "114514", g: { '-h': ?i } }, { j: ?k }] }
}
puts format_xml hash_to_xml root
