gistfile1.txt

# benchmarking yaml_waml converting string.

require 'benchmark'
require 'yaml'

class String
  def is_binary_data?
    false
  end
end

data = [ "あいうえお漢字" * 10000, "__BBBBBBBBBBBBBBB__", "あいうえお" * 10000 ]

yaml_str = data.to_yaml
Benchmark.bm do |x|
  x.report('original yaml_waml') {
    yaml_str.gsub(/\\x(\w{2})/) {
      [ Regexp.last_match.captures.first.to_i(16)].pack("C")
    }
  }

  x.report('using $1') {
    yaml_str.gsub(/\\x(\w{2})/) {
      [ $1.to_i(16) ].pack("C")
    }
  }

  x.report('with memoize') {
    memoize_of = {}
    yaml_str.gsub(/\\x(\w{2})/) {|s|
      memoize_of[s] ||= [ Regexp.last_match.captures.first.to_i(16)].pack("C")
    }
  }

  x.report('with memoize and $1') {
    memoize_of = {}
    yaml_str.gsub(/\\x(\w{2})/) {|s|
      memoize_of[s] ||= [ $1.to_i(16) ].pack("C")
    }
  }

  x.report('with symbol table ') {
    memoize_of = {}
    chars = %w( 0 1 2 3 4 5 6 7 8 9 A B C D E F )
    chars.each do |char1|
      chars.each do |char2|
        val = char1 + char2
        memoize_of["\\x#{val}"] = [ val.to_i(16) ].pack("C")
      end
    end
    yaml_str.gsub(/\\x\w{2}/) {|s|
      memoize_of[s]
    }
  }
end

# result on my environment( MacBook1.1 Intel Core Duo 1.83 GHz, 2GB), result is like that
#                         user     system      total        real
# original yaml_waml    2.580000   0.030000   2.610000 (  2.699864)
# using $1              2.160000   0.030000   2.190000 (  2.232926)
# with memoize          1.080000   0.010000   1.090000 (  1.123541)
# with memoize and $1   1.120000   0.010000   1.130000 (  1.161925)
# with symbol table     1.060000   0.010000   1.070000 (  1.104250)