benchmark to measure parsing both 'user[123][name]' and 'user.123.name'

bench_nested_query.rb

###
### benchmark to measure parsing both 'user[123][name]' and 'user.123.name'
###

require 'rubygems'
require 'benchmarker'


## copied from rack/utils.rb

def unescape(s)
  s.tr('+', ' ').gsub(/((?:%[0-9a-fA-F]{2})+)/n){
    [$1.delete('%')].pack('H*')
  }
end

DEFAULT_SEP = /[&;] */n

def parse_nested_query(qs, d = nil)
  params = {}

  (qs || '').split(d ? /[#{d}] */n : DEFAULT_SEP).each do |p|
    k, v = unescape(p).split('=', 2)
    normalize_params(params, k, v)
  end

  return params
end

def normalize_params(params, name, v = nil)
  name =~ %r(\A[\[\]]*([^\[\]]+)\]*)
  k = $1 || ''
  after = $' || ''

  return if k.empty?

  if after == ""
    params[k] = v
  elsif after == "[]"
    params[k] ||= []
    raise TypeError, "expected Array (got #{params[k].class.name}) for param `#{k}'" unless params[k].is_a?(Array)
    params[k] << v
  elsif after =~ %r(^\[\]\[([^\[\]]+)\]$) || after =~ %r(^\[\](.+)$)
    child_key = $1
    params[k] ||= []
    raise TypeError, "expected Array (got #{params[k].class.name}) for param `#{k}'" unless params[k].is_a?(Array)
    if params[k].last.is_a?(Hash) && !params[k].last.key?(child_key)
      normalize_params(params[k].last, child_key, v)
    else
      params[k] << normalize_params({}, child_key, v)
    end
  else
    params[k] ||= {}
    raise TypeError, "expected Hash (got #{params[k].class.name}) for param `#{k}'" unless params[k].is_a?(Hash)
    params[k] = normalize_params(params[k], after, v)
  end

  return params
end


##
def parse_dotted_query(qs, d=nil)
  params = {}
  rexp = d ? /[#{d}] */n : DEFAULT_SEP
  (qs || '').split(rexp).each do |p|
    k, v = unescape(p).split('=', 2)
    normalize_dotted_params(params, k, v)
  end
  return params
end

def normalize_dotted_params(params, k, v)
  items = k.split(/\./)
  hash = params
  items[0...-1].each do |item|
    if hash[item].is_a?(Hash)
      hash = hash[item]
    else
      hash = hash[item] = {}
    end
  end
  item = items[-1]
  #if item.end_with?('[]')
  if item =~ /\[\]\z/
    item = item[0...-2]
    if hash[item].is_a?(Array)
      hash[item] << v
    else
      hash[item] = [v]
    end
  else
    hash[item] = v
  end
end



query1 = "user[123][name]=Haruhi&user[123][mail]=haruhi@sos.org&user[123][items][]=Mikuru&user[123][items][]=Yuki"
p parse_nested_query(query1)

query2 = "user.123.name=Haruhi&user.123.mail=haruhi@sos.org&user.123.items[]=Mikuru&user.123.items[]=Yuki"
p parse_dotted_query(query2)


nloop = 10*1000
Benchmarker.new(:cycle=>5, :extra=>1) do |bm|
  bm.task("parse_nested_query()") do
    nloop.times { parse_nested_query(query1) }
  end
  bm.task("parse_dotted_query()") do
    nloop.times { parse_dotted_query(query2) }
  end
end

__END__


# benchmarker.rb:   release 0.0.0
# RUBY_VERSION:     1.8.7
# RUBY_PATCHLEVEL:  334
# RUBY_PLATFORM:    i686-darwin10.6.0
#
# ## Ranking                          real
# parse_dotted_query()              8.2658 (100.0%) ********************
# parse_nested_query()             12.6859 ( 65.2%) *************


# benchmarker.rb:   release 0.0.0
# RUBY_VERSION:     1.9.2
# RUBY_PATCHLEVEL:  180
# RUBY_PLATFORM:    x86_64-darwin10.6.0
#
# ## Ranking                          real
# parse_dotted_query()              7.1663 (100.0%) ********************
# parse_nested_query()             10.3392 ( 69.3%) **************