Integrate Journey into Action Dispatch

Move the Journey code underneath the ActionDispatch namespace so
that we don't pollute the global namespace with names that may
be used for models.

Fixes rails/journey#49.

1 files changed, 168 insertions, 0 deletions

diff --git a/actionpack/lib/action_dispatch/journey/router.rb b/actionpack/lib/action_dispatch/journey/router.rb
new file mode 100644
index 0000000000..fcf16c1272
--- /dev/null
+++ b/actionpack/lib/action_dispatch/journey/router.rb
@@ -0,0 +1,168 @@
+require 'action_dispatch/journey/core-ext/hash'
+require 'action_dispatch/journey/router/utils'
+require 'action_dispatch/journey/router/strexp'
+require 'action_dispatch/journey/routes'
+require 'action_dispatch/journey/formatter'
+
+before = $-w
+$-w = false
+require 'action_dispatch/journey/parser'
+$-w = before
+
+require 'action_dispatch/journey/route'
+require 'action_dispatch/journey/path/pattern'
+
+module ActionDispatch
+  module Journey
+    class Router
+      class RoutingError < ::StandardError
+      end
+
+      VERSION = '2.0.0'
+
+      class NullReq # :nodoc:
+        attr_reader :env
+        def initialize env
+          @env = env
+        end
+
+        def request_method
+          env['REQUEST_METHOD']
+        end
+
+        def path_info
+          env['PATH_INFO']
+        end
+
+        def ip
+          env['REMOTE_ADDR']
+        end
+
+        def [](k); env[k]; end
+      end
+
+      attr_reader :request_class, :formatter
+      attr_accessor :routes
+
+      def initialize routes, options
+        @options       = options
+        @params_key    = options[:parameters_key]
+        @request_class = options[:request_class] || NullReq
+        @routes        = routes
+      end
+
+      def call env
+        env['PATH_INFO'] = Utils.normalize_path env['PATH_INFO']
+
+        find_routes(env).each do |match, parameters, route|
+          script_name, path_info, set_params = env.values_at('SCRIPT_NAME',
+                                                             'PATH_INFO',
+                                                             @params_key)
+
+          unless route.path.anchored
+            env['SCRIPT_NAME'] = (script_name.to_s + match.to_s).chomp('/')
+            env['PATH_INFO']   = match.post_match
+          end
+
+          env[@params_key] = (set_params || {}).merge parameters
+
+          status, headers, body = route.app.call(env)
+
+          if 'pass' == headers['X-Cascade']
+            env['SCRIPT_NAME'] = script_name
+            env['PATH_INFO']   = path_info
+            env[@params_key]   = set_params
+            next
+          end
+
+          return [status, headers, body]
+        end
+
+        return [404, {'X-Cascade' => 'pass'}, ['Not Found']]
+      end
+
+      def recognize req
+        find_routes(req.env).each do |match, parameters, route|
+          unless route.path.anchored
+            req.env['SCRIPT_NAME'] = match.to_s
+            req.env['PATH_INFO']   = match.post_match.sub(/^([^\/])/, '/\1')
+          end
+
+          yield(route, nil, parameters)
+        end
+      end
+
+      def visualizer
+        tt     = GTG::Builder.new(ast).transition_table
+        groups = partitioned_routes.first.map(&:ast).group_by { |a| a.to_s }
+        asts   = groups.values.map { |v| v.first }
+        tt.visualizer asts
+      end
+
+      private
+
+      def partitioned_routes
+        routes.partitioned_routes
+      end
+
+      def ast
+        routes.ast
+      end
+
+      def simulator
+        routes.simulator
+      end
+
+      def custom_routes
+        partitioned_routes.last
+      end
+
+      def filter_routes path
+        return [] unless ast
+        data = simulator.match(path)
+        data ? data.memos : []
+      end
+
+      def find_routes env
+        req = request_class.new env
+
+        routes = filter_routes(req.path_info).concat custom_routes.find_all { |r|
+          r.path.match(req.path_info)
+        }
+        routes.concat get_routes_as_head(routes)
+
+        routes.sort_by!(&:precedence).select! { |r|
+          r.constraints.all? { |k,v| v === req.send(k) } &&
+            r.verb === req.request_method
+        }
+        routes.reject! { |r| req.ip && !(r.ip === req.ip) }
+
+        routes.map! { |r|
+          match_data  = r.path.match(req.path_info)
+          match_names = match_data.names.map { |n| n.to_sym }
+          match_values = match_data.captures.map { |v| v && Utils.unescape_uri(v) }
+          info = Hash[match_names.zip(match_values).find_all { |_,y| y }]
+
+          [match_data, r.defaults.merge(info), r]
+        }
+      end
+
+      def get_routes_as_head(routes)
+        precedence = (routes.map(&:precedence).max || 0) + 1
+        routes = routes.select { |r|
+          r.verb === "GET" && !(r.verb === "HEAD")
+        }.map! { |r|
+          Route.new(r.name,
+                    r.app,
+                    r.path,
+                    r.conditions.merge(:request_method => "HEAD"),
+                    r.defaults).tap do |route|
+                      route.precedence = r.precedence + precedence
+                    end
+        }
+        routes.flatten!
+        routes
+      end
+    end
+  end
+end