Untitled

require 'benchmark'
require 'slim'
require 'erubis'

#gem 'haml', '3.0.21'
gem 'haml', '3.1.0.alpha.14'
require 'haml'

slim = <<-SLIM
! doctype html
html
  head
    title Test
  body
    h1 simple markup
    div#content

    - unless items.empty?
      ol
        - for item in items do
          li
            = item
    - else
      p No items
SLIM

erb = <<-ERB
<!doctype html>
<html>
  <head>
    <title>Test</title>
  </head>
  <body>
    <h1>simple markup</h1>
    <div id="content">
      <% unless items.empty? %>
        <% for item in items do %>
          <li><%= item %></li>
        <% end %>
      <% else %>
        <p>No items</p>
      <% end %>
    </div>
  </body>
</html>
ERB

haml= <<-HAML
!!! html
%html
  %head
    %title Test
  %body
    %h1 simple markup
    %div#content
      - unless items.empty?
        - for item in items do
          %li= item
      - else
        %p No items
HAML

class Foo
  attr_reader :items
  def initialize
    @items = [1, 2, 3, 4, 5]
  end
end

foo = Foo.new
n = 10_000

Benchmark.bmbm do |bench|
  bench.report('empty loop') { n.times { } }

  # compute template every time
  bench.report('erubis') { n.times { Erubis::Eruby.new(erb).result(:items => foo.items) } }
  bench.report('slim') { n.times { Slim::Engine.new(slim).render(foo) } }
  bench.report("haml #{Haml::VERSION}") { n.times { Haml::Engine.new(haml, :format => :html5).render(foo) } }
  bench.report("haml (ugly) #{Haml::VERSION}") { n.times { Haml::Engine.new(haml, :format => :html5, :ugly => true).render(foo) } }

  # cache compiled template
  bench.report('erubis (cache)') { t = Erubis::Eruby.new(erb); n.times { t.result(:items => foo.items) } }
  bench.report('slim (cache)') { t = Slim::Engine.new(slim); for i in 0..n; t.render(foo); end }
  bench.report("haml #{Haml::VERSION} (cached)") { t = Haml::Engine.new(haml, :format => :html5); n.times { t.render(foo) } }
  bench.report("haml (ugly) #{Haml::VERSION} (cached)") { t = Haml::Engine.new(haml, :format => :html5, :ugly => true); n.times { t.render(foo) } }
end