class Aws::Xml::Parser::RexmlEngine

def initialize(stack)
  @stack = stack
  @depth = 0
end

def parse(xml)
  begin
    mutable_xml = xml.dup # REXML only accepts mutable string
    source = REXML::Source.new(mutable_xml)
    REXML::Parsers::StreamParser.new(source, self).parse
  rescue REXML::ParseException => error
    @stack.error(error.message)
  end
end

def tag_end(name)
  @stack.end_element
  @depth -= 1
end

def tag_start(name, attrs)
  @depth += 1
  @stack.start_element(name)
  attrs.each do |attr|
    @stack.attr(*attr)
  end
end

def text(value)
  @stack.text(value) if @depth > 0
end