#!/usr/bin/ruby
#
# See if it's with the extra hassle to reuse StringScanner objects instead of
# creating a new one every time.
# 
# Time-stamp: <29-Mar-2004 08:10:25 ged>
#
 
BEGIN {
  base = File::dirname( File::dirname(File::expand_path(__FILE__)) )
  $LOAD_PATH.unshift "#{base}/lib"
 
  require "#{base}/utils.rb"
  include UtilityFunctions
}
 
require 'benchmark'
require 'strscan'
 
str = "some strange otaku kidnapped my iBook"
iterations = 100_000
 
puts "Benchmarking StringScanner object creation strategies:\n" +
  "    (#{iterations} iterations)"
Benchmark.bm(20) do |x|
  x.report("new one every time:")   {
    iterations.times do
      s = StringScanner::new( str )
      s.scan_until( /B/ )
    end
  }
 
  x.report("reused:")   {
    s = StringScanner::new( str )
    iterations.times do
      s.string = str
      s.scan_until( /B/ )
    end
  }
end