import sinatra-decompile

sinatra-contrib/lib/sinatra/decompile.rb

@@ -0,0 +1,61 @@
+require 'sinatra/base'
+require 'backports'
+
+module Sinatra
+  ##
+  # Can be used as extension or stand-alone:
+  #
+  #   Sinatra::Decompile.decompile(...)
+  module Decompile
+    extend self
+
+    ##
+    # Regenerates a string pattern for a given route
+    #
+    # Example:
+    #
+    #   class Sinatra::Application
+    #     routes.each do |verb, list|
+    #       puts "#{verb}:"
+    #       list.each do |data|
+    #         puts "\t" << decompile(data)
+    #       end
+    #     end
+    #   end
+    #
+    # Will return the internal Regexp if unable to reconstruct the pattern,
+    # which likely indicates that a Regexp was used in the first place.
+    #
+    # You can also use this to check whether you could actually use a string
+    # pattern instead of your regexp:
+    #
+    #   decompile /^/foo$/ # => '/foo'
+    def decompile(pattern, keys = nil, *)
+      # Everything in here is basically just the reverse of
+      # Sinatra::Base#compile
+      pattern, keys = pattern if pattern.respond_to? :to_ary
+      keys, str     = keys.try(:dup), pattern.inspect
+      return pattern unless str.start_with? '/' and str.end_with? '/'
+      str.gsub! /^\/\^?|\$?\/$/, ''
+      return pattern if str =~ /^[\.\+]/
+      str.gsub! /\([^\(]*\)/ do |part|
+        case part
+        when '(.*?)'
+          return pattern if keys.shift != 'splat'
+          '*'
+        when '([^\/?#]+)'
+          return pattern if keys.empty?
+          ":" << keys.shift
+        else
+          return pattern
+        end
+      end
+      str.gsub /(.)([\.\+\(\)\/])/ do
+        return pattern if $1 != "\\"
+        $2
+      end
+    end
+  end
+
+  register Decompile
+end

sinatra-contrib/spec/decompile_spec.rb

@@ -0,0 +1,42 @@
+require 'backports'
+require_relative 'spec_helper'
+
+RSpec::Matchers.define :decompile do |path|
+  match do |app|
+    @compiled, @keys    = app.send :compile, path
+    @decompiled         = app.decompile(@compiled, @keys)
+    @decompiled.should == path
+  end
+
+  failure_message_for_should do |app|
+    values = [app, @compiled, @keys, path, @decompiled].map(&:inspect)
+    "expected %s to decompile %s with %s to %s, but was %s" % values
+  end
+end
+
+describe Sinatra::Decompile do
+  subject { Sinatra::Application }
+  it { should decompile("") }
+  it { should decompile("/") }
+  it { should decompile("/?") }
+  it { should decompile("/foo") }
+  it { should decompile("/:name") }
+  it { should decompile("/:name?") }
+  it { should decompile("/:foo/:bar") }
+  it { should decompile("/page/:id/edit") }
+  it { should decompile("/hello/*") }
+  it { should decompile("/*/foo/*") }
+  it { should decompile("*") }
+  it { should decompile(":name.:format") }
+  it { should decompile(/./) }
+  it { should decompile(/f(oo)/) }
+  it { should decompile(/ba+r/) }
+
+  it 'just returns strings' do
+    subject.decompile('/foo').should == '/foo'
+  end
+
+  it 'just decompile simple regexps without keys' do
+    subject.decompile(%r{/foo}).should == '/foo'
+  end
+end

sinatra-contrib/spec/spec_helper.rb

@@ -0,0 +1,11 @@
+require 'forwardable'
+
+module TestHelpers
+end
+
+require 'sinatra/contrib'
+
+RSpec.configure do |config|
+  config.expect_with :rspec, :stdlib
+  config.include Sinatra::TestHelpers
+end