gistfile1.rb

require 'nokogiri'

# This test runs an infinite loop which throws from random Nokogiri SAX handler
# callbacks.
#
# It uses the sample XML files in Nokogiri's test suite, and expects to run from
# the Nokogiri folder, e.g. via:
#   $ cd ~/workspace/nokogiri
#   $ ruby -Ilib smokesax.rb

class RandomJumpHandler < Nokogiri::XML::SAX::Document
  def initialize(jumptag)
    @jumptag = jumptag
    super()
  end

  def xmldecl version, encoding, standalone
    random_jump
  end

  def start_document
    random_jump
  end
  
  def end_document
    random_jump
  end

  def start_element name, attrs = []
    random_jump
  end

  def end_element name
    random_jump
  end

  def start_element_namespace name, attrs = [], prefix = nil, uri = nil, ns = []
    random_jump
  end

  def end_element_namespace name, prefix = nil, uri = nil
    random_jump
  end

  def characters string
    random_jump
  end

  def comment string
    random_jump
  end

  def warning string
    random_jump
  end

  def error string
    random_jump
  end

  def cdata_block string
    random_jump
  end

  private
  
  def random_jump
    if (rand > 0.9)
      throw @jumptag
    end
  end
end

files = Dir.glob('test/files/*.xml')
doc = RandomJumpHandler.new(:foo)

loop do
  parser = Nokogiri::HTML::SAX::Parser.new(doc)
  files.each do |file|
    catch(:foo) do
      parser.parse(File.open(file, 'r'))
    end
  end
end