bench results.txt

Running with tiny string
- only scanning then injecting:  0.0131118297576904 seconds
- scanning groups and injecting: 0.0120480060577393 seconds
- scanning then splat hashing:   0.0159380435943604 seconds
- splitting then splat hashing:  0.00326204299926758 seconds

Running with medium string
- only scanning then injecting:  0.13988208770752 seconds
- scanning groups and injecting: 0.12324595451355 seconds
- scanning then splat hashing:   0.242349147796631 seconds
- splitting then splat hashing:  0.0289840698242188 seconds

Running with ridiculous string
- only scanning then injecting:  1.17678284645081 seconds
- scanning groups and injecting: 1.26292014122009 seconds
- scanning then splat hashing:   18.0726480484009 seconds
- splitting then splat hashing:  0.281298160552979 seconds

gistfile1.rbx

Hash[*options.split(/&|=/)]

paramer bench.rb

require 'benchmark'
require 'paramer'

class String
  def pad_to(size)
    spaces = size - length
    return self unless spaces > 0
    spaces.times { self << " " }
    self
  end
end

def bench(name, options={})
  $stdout.print "#{name} ".pad_to(33)
  $stdout.flush
  result = Benchmark.measure { yield }
  puts "#{result.real} seconds"
end

def run(name, string)
  puts name
  bench("- only scanning then injecting:") { string.scan_then_inject }
  bench("- scanning groups and injecting:") { string.scan_groups_then_inject }
  bench("- scanning then splat hashing:") { string.scan_then_splat_hash }
  bench("- splitting then splat hashing:") { string.split_then_splat_hash }
  puts
end

TINY = ("foo=bar&this=that&klass=eigen=_method=get&" * 500).freeze
MED = (TINY * 10).freeze
LONG = (MED * 10).freeze

run "Running with tiny string", TINY
run "Running with medium string", MED
run "Running with ridiculous string", LONG

paramer spec.rb

describe String, "param parsing" do
  before(:each) do
    @result = { "foo" => "bar", "this" => "that" }
  end

  it "scans then injects" do
    "foo=bar&this=that&".scan_then_inject.should == @result
  end

  it "scans groups then injects" do
    "foo=bar&this=that&".scan_groups_then_inject.should == @result
  end

  it "scans splat hashes" do
    "foo=bar&this=that&".scan_then_splat_hash.should == @result
  end

  it "splits then splat hashes" do
    "foo=bar&this=that&".split_then_splat_hash.should == @result
  end
end

paramer.rb

class String
  def scan_then_inject
    scan(/\w+=\w+/).inject({}) { |h,opt| kv = opt.split('='); h[kv.first] = kv.last; h }
  end
  
  def scan_groups_then_inject
    scan(/\w+=\w+/).inject({}) { |h,opt| kv = opt.split('='); h[kv.first] = kv.last; h }
  end
  
  def scan_then_splat_hash
    Hash[*scan(/(\w+)=(\w+)/).flatten]
  end
  
  def split_then_splat_hash
    Hash[*split(/&|=/)]
  end
end