i18n-intern.rb

# in response to http://littlelines.com/blog/2014/06/27/elixir-vs-ruby-showdown-part-one
# comment on https://twitter.com/josevalim/status/483165833699799040

require 'yaml'

module I18n
  SPEC = YAML.load(<<-END)
    en:
      foo: "bar"
      flash:
        notice:
          alert: "Alert!"
          hello: "hello %{first} %{last}"
          bye: "bye now %{name}!"
      users:
        title: "Users"
        profiles:
          title: "Profiles"
  END

  @cache = {}
  def self.clear_cache
    @cache = {}
  end

  def self.t(path, **opts)
    case handler = @cache[path]
    when Proc
      handler[opts]

    when nil
      parts = path.to_s.
        split(".").
        inject(SPEC["en"]) { |r,v| r[v] }.
        split(/%\{(\w+)\}/)

      if parts.size == 1
        @cache[path] = parts[0]

      else
        code = "result = #{parts.shift.inspect}\n"
        loop do
          var = parts.shift
          break unless var
          code << "result << ops[:#{var}]\n"
          str = parts.shift
          break unless str
          code << "result << #{str.inspect}\n"
        end

        code = %{
          proc do |ops|
            #{code}
          end
        }

        @cache[path] = handler = eval(code)
        handler[opts]
      end

    else
      handler
    end
  end
end

if ARGV.delete("--test")
  p I18n.t("foo")
  p I18n.t("users.profiles.title")
  p I18n.t("flash.notice.hello", first: "chris", last: "mccord")
  p I18n.t(:"flash.notice.hello", first: "john", last: "doe")
  exit
end

require 'benchmark'

N = 1_000_000

Benchmark.bm(20) do |bm|
  bm.report("string args") do
    I18n.clear_cache
    N.times do
      I18n.t("foo")
      I18n.t("users.profiles.title")
      I18n.t("flash.notice.hello", first: "chris", last: "mccord")
      I18n.t("flash.notice.hello", first: "john", last: "doe")
    end
  end

  bm.report("symbol args") do
    I18n.clear_cache
    N.times do
      I18n.t(:"foo")
      I18n.t(:"users.profiles.title")
      I18n.t(:"flash.notice.hello", first: "chris", last: "mccord")
      I18n.t(:"flash.notice.hello", first: "john", last: "doe")
    end
  end
end

__END__

$ cat /proc/cpuinfo | grep 'model name' | uniq
model name  : Intel(R) Core(TM) i7-4500U CPU @ 1.80GHz
$ ruby -v
ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux]
$ ruby i18n-intern.rb
                           user     system      total        real
string args            3.560000   0.010000   3.570000 (  3.571387)
symbol args            3.250000   0.010000   3.260000 (  3.252616)

i18n.rb

# in response to http://littlelines.com/blog/2014/06/27/elixir-vs-ruby-showdown-part-one

require 'yaml'

module I18n
  SPEC = YAML.load(<<-END)
    en:
      foo: "bar"
      flash:
        notice:
          alert: "Alert!"
          hello: "hello %{first} %{last}"
          bye: "bye now %{name}!"
      users:
        title: "Users"
        profiles:
          title: "Profiles"
  END

  @cache = {}

  def self.t(path, **opts)
    case handler = @cache[path]
    when Proc
      handler[opts]

    when nil
      spec = path.split(".").inject(SPEC["en"]) { |r,v| r[v] }
      parts = spec.split(/%\{(\w+)\}/)

      if parts.size == 1
        @cache[path] = parts[0]

      else
        code = "result = #{parts.shift.inspect}\n"
        loop do
          var = parts.shift
          break unless var
          code << "result << ops[:#{var}]\n"
          str = parts.shift
          break unless str
          code << "result << #{str.inspect}\n"
        end

        code = %{
          proc do |ops|
            #{code}
          end
        }

        @cache[path] = handler = eval(code)
        handler[opts]
      end

    else
      handler
    end
  end
end

if ARGV.delete("--test")
  p I18n.t("foo")
  p I18n.t("users.profiles.title")
  p I18n.t("flash.notice.hello", first: "chris", last: "mccord")
  p I18n.t("flash.notice.hello", first: "john", last: "doe")

  exit
end

require 'benchmark'

N = 1_000_000

class Benchmarker
  def self.run
    Benchmark.measure do
      N.times do |i|
        I18n.t("foo")
        I18n.t("users.profiles.title")
        I18n.t("flash.notice.hello", first: "chris", last: "mccord")
        I18n.t("flash.notice.hello", first: "john", last: "doe")
      end
    end.real
  end
end

p Benchmarker.run