RUBY: RoutesJs

routes_js.rb

#
# Rails 3 Version 
# - ported to rails3
# - optimize javascript
#
# setup/usage:
# 1. copy to RAILS_ROOT/app/middleware/
# 2. application.rb ... config.middleware.use 'RoutesJs'
# 3. Layoutfile: <%= javascript_include_tag 'routes' %>
# 4. js usage: category_url({ slug:'test',format:'json', page:2 })
#
# inspired by rails2 version - Aleksandr Koss (kossnocorp@gmail.com) https://gist.github.com/235086

class RoutesJs
  def initialize app, options = {}
    @app = app
    @options = options
  end

  def call env
    if env['PATH_INFO'] =~ /^\/javascripts\/routes.js$/

      response = rails_route_function
      host = "#{env['rack.url_scheme']}://#{env['HTTP_HOST']}"
      
      routes = Rails.application.routes.routes.collect do |route|
        path = route.path
        named_route = route.name

        unless named_route.blank?
          response << route_function("#{named_route}_path", path)
          response << route_function("#{named_route}_url",  host + path)
        end
      end

      [200, {'Content-Type' => 'application/javascript'}, [response]]
    else
      @app.call env
    end
  end

private

  def rails_route_function
<<EOF
function rails_route(path, params) {
  var path_copy = path;
  for(var key in params) {
    if (params.hasOwnProperty(key))
    {
      path_copy = path_copy.replace(
        ':' + key,
        params[key]
      );
    }
  }

  return(
    path_copy
      .replace(/.:format/g, '')
      .replace(/\\/:\\w+\\)/g, '')
      .replace(/[(|)]|\\.$/g, '')
  );
}
EOF
  end

  def route_function name, path
<<EOF
function #{name}(params) { return(rails_route('#{path}', params)); }
EOF
  end
end