#!/usr/bin/env ruby

=begin
The MIT License

Copyright (c) 2010 - 2015 Slim Team

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
=end

#
# SlimBenchmarks with following modifications:
#   1. Skipping slow engines, tilt and parsing benches.
#

$:.unshift(File.join(File.dirname(__FILE__), '..', 'lib'), File.dirname(__FILE__))

require 'slim'
require 'context'

require 'benchmark/ips'
require 'tilt'
require 'erubis'
require 'erb'
require 'haml'

class SlimBenchmarks
  def initialize(slow)
    @benches    = []

    @erb_code  = File.read(File.dirname(__FILE__) + '/view.erb')
    @haml_code = File.read(File.dirname(__FILE__) + '/view.haml')
    @slim_code = File.read(File.dirname(__FILE__) + '/view.slim')

    init_compiled_benches
    # init_tilt_benches
    # init_parsing_benches if slow
  end

  def init_compiled_benches
    haml_pretty = Haml::Engine.new(@haml_code, format: :html5)
    haml_ugly   = Haml::Engine.new(@haml_code, format: :html5, ugly: true)

    context  = Context.new

    haml_pretty.def_method(context, :run_haml_pretty)
    haml_ugly.def_method(context, :run_haml_ugly)
    context.instance_eval %{
      def run_erb; #{ERB.new(@erb_code).src}; end
      def run_erubis; #{Erubis::Eruby.new(@erb_code).src}; end
      def run_temple_erb; #{Temple::ERB::Engine.new.call @erb_code}; end
      def run_fast_erubis; #{Erubis::FastEruby.new(@erb_code).src}; end
      def run_slim_pretty; #{Slim::Engine.new(pretty: true).call @slim_code}; end
      def run_slim_ugly; #{Slim::Engine.new.call @slim_code}; end
    }

    bench('(1) erb')         { context.run_erb }
    bench('(1) erubis')      { context.run_erubis }
    bench('(1) fast erubis') { context.run_fast_erubis }
    bench('(1) temple erb')  { context.run_temple_erb }
    # bench('(1) slim pretty') { context.run_slim_pretty }
    bench('(1) slim ugly')   { context.run_slim_ugly }
    # bench('(1) haml pretty') { context.run_haml_pretty }
    bench('(1) haml ugly')   { context.run_haml_ugly }
  end

  def init_tilt_benches
    tilt_erb         = Tilt::ERBTemplate.new { @erb_code }
    tilt_erubis      = Tilt::ErubisTemplate.new { @erb_code }
    tilt_temple_erb  = Temple::ERB::Template.new { @erb_code }
    tilt_haml_pretty = Tilt::HamlTemplate.new(format: :html5) { @haml_code }
    tilt_haml_ugly   = Tilt::HamlTemplate.new(format: :html5, ugly: true) { @haml_code }
    tilt_slim_pretty = Slim::Template.new(pretty: true) { @slim_code }
    tilt_slim_ugly   = Slim::Template.new { @slim_code }

    context  = Context.new

    bench('(2) erb')         { tilt_erb.render(context) }
    bench('(2) erubis')      { tilt_erubis.render(context) }
    bench('(2) temple erb')  { tilt_temple_erb.render(context) }
    bench('(2) slim pretty') { tilt_slim_pretty.render(context) }
    bench('(2) slim ugly')   { tilt_slim_ugly.render(context) }
    bench('(2) haml pretty') { tilt_haml_pretty.render(context) }
    bench('(2) haml ugly')   { tilt_haml_ugly.render(context) }
  end

  def init_parsing_benches
    context  = Context.new
    context_binding = context.instance_eval { binding }

    bench('(3) erb')         { ERB.new(@erb_code).result(context_binding) }
    bench('(3) erubis')      { Erubis::Eruby.new(@erb_code).result(context_binding) }
    bench('(3) fast erubis') { Erubis::FastEruby.new(@erb_code).result(context_binding) }
    bench('(3) temple erb')  { Temple::ERB::Template.new { @erb_code }.render(context) }
    bench('(3) slim pretty') { Slim::Template.new(pretty: true) { @slim_code }.render(context) }
    bench('(3) slim ugly')   { Slim::Template.new { @slim_code }.render(context) }
    bench('(3) haml pretty') { Haml::Engine.new(@haml_code, format: :html5).render(context) }
    bench('(3) haml ugly')   { Haml::Engine.new(@haml_code, format: :html5, ugly: true).render(context) }
  end

  def run
    Benchmark.ips do |x|
      @benches.each do |name, block|
        x.report(name.to_s, &block)
      end
      x.compare!
    end
    puts "
(1) Compiled benchmark. Template is parsed before the benchmark and
    generated ruby code is compiled into a method.
    This is the fastest evaluation strategy because it benchmarks
    pure execution speed of the generated ruby code.
"
    return # Skipping (2) and (3)
    puts "
(2) Compiled Tilt benchmark. Template is compiled with Tilt, which gives a more
    accurate result of the performance in production mode in frameworks like
    Sinatra, Ramaze and Camping. (Rails still uses its own template
    compilation.)

(3) Parsing benchmark. Template is parsed every time.
    This is not the recommended way to use the template engine
    and Slim is not optimized for it. Activate this benchmark with 'rake bench slow=1'.

Temple ERB is the ERB implementation using the Temple framework. It shows the
overhead added by the Temple framework compared to ERB.
"
  end

  def bench(name, &block)
    @benches.push([name, block])
  end
end

SlimBenchmarks.new(ENV['slow']).run