Add benchmark

benchmark/tree_visti_vs_xpath.cr

@@ -0,0 +1,48 @@
+require "crystagiri"
+
+def do_test(url : String)
+  Crystagiri::HTML.experimental = false
+  t = Time.now
+  doc = Crystagiri::HTML.from_url url
+  1..100000.times do
+    doc.at_tag("div")
+    doc.where_class("step-title") { |tag| tag }
+    doc.where_class("content") { |tag| tag }
+    doc.where_tag("span") { |tag| tag }
+  end
+  result_legacy = Time.now - t
+
+  Crystagiri::HTML.experimental = true
+  t = Time.now
+  doc = Crystagiri::HTML.from_url url
+  1..100000.times do
+    doc.at_tag("div")
+    doc.where_class("step-title") { |tag| tag }
+    doc.where_class("content") { |tag| tag }
+    doc.where_tag("span") { |tag| tag }
+  end
+  result_experimental = Time.now - t
+
+  [result_legacy.milliseconds, result_experimental.milliseconds]
+end
+
+test_links = [
+  "https://www.quirksmode.org/html5/tests/video.html",
+  "http://www.8164.org/the-big-table-issue/",
+  "https://lawsofux.com/",
+  "https://www.youtube.com/"
+]
+
+total_legacy = 0
+total_experimental = 0
+
+test_links.each do | link | 
+  print "."
+  legacy, experimental = do_test link
+
+  total_legacy += legacy
+  total_experimental += experimental
+  print "."
+end
+
+puts "Test ran on #{test_links.size} links.\nTime with xpath method: #{total_legacy} ms.\nTime with experimental method: #{total_experimental} ms."