xsd2ruby.rb

require 'nokogiri'
require 'active_support/all'

def traverse(nodes, tabs = 0)
  nodes.each do |node|
    unless node.is_a? Nokogiri::XML::Element
      if node.is_a?(Nokogiri::XML::Text)
        puts ' ' * tabs + node.content.sub(/^\s+/, '').inspect if node.content !~ /^\s+$/
      end
      next
    end
    attrs = node.attributes
    name = attrs.delete 'name'
    attrs = attrs.map { |(key, value)|
      v = value.content
      v = case v
      when /^-?\d+$/
        v.to_i.inspect
      when /^xs:.+$/
        ":#{v.sub('xs:', '')}"
      when String
        v.inspect
      end
      "#{key.underscore}: #{v}"
    }.join(", ")

    print "#{' ' * tabs}#{node.name.underscore}"
    if name
      print " #{name.content.inspect}"
      print "," unless attrs.empty?
    end
    print " #{attrs}" unless attrs.empty?

    unless node.children.empty?
      puts " do"
      traverse node.children, tabs + 2
      puts "#{' ' * tabs}end"
    else
      puts
    end
  end
end

File.open('XMLSchema.xsd') { |f|
  xml = Nokogiri::XML(f.read)
  traverse xml.children
}