Benchmarks for comparing Oga with others.

This includes two benchmarks: one for parsing XML and one for evaluating XPath.

benchmark/xml/parser/comparing_gems_bench.rb

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+require_relative '../../benchmark_helper'
+
+require 'nokogiri'
+require 'ox'
+require 'rexml/document'
+
+xml = read_big_xml
+
+Benchmark.ips do |bench|
+  bench.report 'Ox' do
+    Ox.parse(xml)
+  end
+
+  bench.report 'Nokogiri' do
+    Nokogiri::XML(xml)
+  end
+
+  bench.report 'Oga' do
+    Oga::XML::Parser.new(xml).parse
+  end
+
+  bench.report 'REXML' do
+    REXML::Document.new(xml)
+  end
+
+  bench.compare!
+end

benchmark/xpath/parser/comparing_gems_bench.rb

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+require_relative '../../benchmark_helper'
+
+require 'nokogiri'
+require 'ox'
+require 'rexml/document'
+
+xml = '<root><number>10</number></root>'
+
+ox_doc   = Ox.parse(xml)
+noko_doc = Nokogiri::XML(xml)
+oga_doc  = Oga::XML::Parser.new(xml).parse
+rex_doc  = REXML::Document.new(xml)
+
+ox_exp    = 'number/^Text'
+xpath_exp = 'root/number/text()'
+
+Benchmark.ips do |bench|
+  # Technically not XPath but it's the closest thing Ox provides.
+  bench.report 'Ox' do
+    ox_doc.locate(ox_exp)
+  end
+
+  bench.report 'Nokogiri' do
+    noko_doc.xpath(xpath_exp)
+  end
+
+  bench.report 'Oga' do
+    oga_doc.xpath(xpath_exp)
+  end
+
+  bench.report 'REXML' do
+    REXML::XPath.match(rex_doc, xpath_exp)
+  end
+
+  bench.compare!
+end