parse.yaml

loop_count: 100
contexts:
  - gems:
      rexml: 3.2.6
    require: false
    prelude: require 'rexml'
  - name: master
    prelude: |
      $LOAD_PATH.unshift(File.expand_path("lib"))
      require 'rexml'
  - name: 3.2.6(YJIT)
    gems:
      rexml: 3.2.6
    require: false
    prelude: |
      require 'rexml'
      RubyVM::YJIT.enable
  - name: master(YJIT)
    prelude: |
      $LOAD_PATH.unshift(File.expand_path("lib"))
      require 'rexml'
      RubyVM::YJIT.enable

prelude: |
  require 'rexml/document'
  require 'rexml/parsers/sax2parser'
  require 'rexml/parsers/pullparser'
  require 'rexml/parsers/streamparser'
  require 'rexml/streamlistener'

  n_elements = Integer(ENV.fetch("N_ELEMENTS", "5000"), 10)
  n_attributes = Integer(ENV.fetch("N_ATTRIBUTES", "2"), 10)

  def build_xml(n_elements, n_attributes)
    xml = '<?xml version="1.0"?><root>'
    n_elements.times do |i|
      xml << '<child '
      n_attributes.times {|j| xml << "id#{j}=\"#{i}\" " }
      xml << '/>'
    end
    xml << '</root>'
  end
  xml = build_xml(n_elements, n_attributes)

  class Listener
    include REXML::StreamListener
  end

benchmark:
  'dom'        : REXML::Document.new(xml).elements.each("root/child") {|_|}
  'sax'        : REXML::Parsers::SAX2Parser.new(xml).parse
  'pull'       : |
    parser = REXML::Parsers::PullParser.new(xml)
    while parser.has_next?
      parser.pull
    end
  'stream'     : REXML::Parsers::StreamParser.new(xml, Listener.new).parse