Benchmarks/profilers for IO inputs in the lexer.

benchmark/benchmark_helper.rb

@@ -1,15 +1,25 @@
+require 'stringio'
 require 'benchmark'
 require 'benchmark/ips'
 
 require_relative '../lib/oga'
 
+##
+# Returns a File instance pointing to the sample XML file.
+#
+# @return [File]
+#
+def big_xml_file
+  return File.open(File.expand_path('../fixtures/big.xml', __FILE__), 'r')
+end
+
 ##
 # Reads a big XML file and returns it as a String.
 #
 # @return [String]
 #
 def read_big_xml
-  return File.read(File.expand_path('../fixtures/big.xml', __FILE__))
+  return big_xml_file.read
 end
 
 ##

benchmark/lexer/big_xml_io_average.rb

@@ -0,0 +1,5 @@
+require_relative '../benchmark_helper'
+
+measure_average do
+  Oga::XML::Lexer.new(big_xml_file).advance { }
+end

benchmark/lexer/big_xml_io_time.rb

@@ -0,0 +1,7 @@
+require_relative '../benchmark_helper'
+
+Benchmark.bmbm(10) do |bench|
+  bench.report '10MB of XML using IO' do
+    Oga::XML::Lexer.new(big_xml_file).advance { |tok| }
+  end
+end

profile/lexer/big_xml_io.rb

@@ -0,0 +1,5 @@
+require_relative '../profile_helper'
+
+profile_memory('lexer/big_xml') do
+  Oga::XML::Lexer.new(big_xml_file).advance { }
+end

profile/profile_helper.rb

@@ -1,4 +1,5 @@
 require 'timeout'
+require 'stringio'
 
 require_relative '../lib/oga'
 
@@ -20,13 +21,24 @@ def memory_usage
   return kb * 1024
 end
 
+##
+# Returns a File instance pointing to the sample XML file.
+#
+# @return [File]
+#
+def big_xml_file
+  path = File.expand_path('../../benchmark/fixtures/big.xml', __FILE__)
+
+  return File.open(path, 'r')
+end
+
 ##
 # Reads a big XML file and returns it as a String.
 #
 # @return [String]
 #
 def read_big_xml
-  return File.read(File.expand_path('../../benchmark/fixtures/big.xml', __FILE__))
+  return big_xml_file.read
 end
 
 ##