class Aws::Xml::Parser::LibxmlEngine

def initialize(stack)
  @stack = stack
end

def on_characters(chars)
  @stack.text(chars)
end

def on_end_element_ns(*ignored)
  @stack.end_element
end

def on_error(msg)
  @stack.error(msg)
end

def on_start_element_ns(element_name, attributes, prefix = nil, uri = nil, ns = {})
  # libxml-ruby does not provide a mapping from element attribute
  # names to their qname prefixes. The following code line assumes
  # that if a attribute ns is defined it applies to all attributes.
  # This is necessary to support parsing S3 Object ACL Grantees.
  # qnames are not used by any other AWS attribute. Also, new
  # services are using JSON, limiting the possible blast radius
  # of this patch.
  attr_ns_prefix = ns.keys.first
  @stack.start_element(element_name)
  attributes.each do |attr_name, attr_value|
    attr_name = "#{attr_ns_prefix}:#{attr_name}" if attr_ns_prefix
    @stack.attr(attr_name, attr_value)
  end
end

def parse(xml)
  parser = ::LibXML::XML::SaxParser.string(xml)
  parser.callbacks = self
  parser.parse
end