pull up path parsing

`add_route` needs the AST, so rather than shove it in a hash and delete
later, lets move parsing up the stack so we can pass down later

actionpack/lib/action_dispatch/journey/parser_extras.rb

@@ -6,6 +6,10 @@ module ActionDispatch
     class Parser < Racc::Parser # :nodoc:
       include Journey::Nodes
 
+      def self.parse(string)
+        new.parse string
+      end
+
       def initialize
         @scanner = Scanner.new
       end

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -61,13 +61,13 @@ module ActionDispatch
         attr_reader :requirements, :conditions, :defaults
         attr_reader :to, :default_controller, :default_action
 
-        def self.build(scope, set, path, controller, default_action, to, via, formatted, options_constraints, options)
+        def self.build(scope, set, ast, controller, default_action, to, via, formatted, options_constraints, options)
           options = scope[:options].merge(options) if scope[:options]
 
           defaults = (scope[:defaults] || {}).dup
           scope_constraints = scope[:constraints] || {}
 
-          new set, path, defaults, controller, default_action, scope[:module], to, formatted, scope_constraints, scope[:blocks] || [], via, options_constraints, options
+          new set, ast, defaults, controller, default_action, scope[:module], to, formatted, scope_constraints, scope[:blocks] || [], via, options_constraints, options
         end
 
         def self.check_via(via)
@@ -98,7 +98,7 @@ module ActionDispatch
           format != false && !path.include?(':format') && !path.end_with?('/')
         end
 
-        def initialize(set, path, defaults, controller, default_action, modyoule, to, formatted, scope_constraints, blocks, via, options_constraints, options)
+        def initialize(set, ast, defaults, controller, default_action, modyoule, to, formatted, scope_constraints, blocks, via, options_constraints, options)
           @defaults = defaults
           @set = set
 
@@ -106,7 +106,6 @@ module ActionDispatch
           @default_controller = controller
           @default_action     = default_action
 
-          ast  = path_ast path
           path_params = path_params ast
 
           options = normalize_options!(options, formatted, path_params, ast, modyoule)
@@ -306,11 +305,6 @@ module ActionDispatch
             ast.grep(Journey::Nodes::Symbol).map { |n| n.name.to_sym }
           end
 
-          def path_ast(path)
-            parser = Journey::Parser.new
-            parser.parse path
-          end
-
           def dispatcher(raise_on_name_error)
             @set.dispatcher raise_on_name_error
           end
@@ -1607,7 +1601,9 @@ module ActionDispatch
                end
 
           path = Mapping.normalize_path URI.parser.escape(path), formatted
-          mapping = Mapping.build(@scope, @set, path, controller, default_action, to, via, formatted, options_constraints, options)
+          ast = Journey::Parser.parse path
+
+          mapping = Mapping.build(@scope, @set, ast, controller, default_action, to, via, formatted, options_constraints, options)
           app, conditions, requirements, defaults = mapping.to_route
           @set.add_route(app, conditions, requirements, defaults, as, anchor)
         end

actionpack/test/dispatch/mapper_test.rb

@@ -98,7 +98,8 @@ module ActionDispatch
       def test_mapping_requirements
         options = { }
         scope = Mapper::Scope.new({})
-        m = Mapper::Mapping.build(scope, FakeSet.new, '/store/:name(*rest)', 'foo', 'bar', nil, [:get], nil, {}, options)
+        ast = Journey::Parser.parse '/store/:name(*rest)'
+        m = Mapper::Mapping.build(scope, FakeSet.new, ast, 'foo', 'bar', nil, [:get], nil, {}, options)
         _, _, requirements, _ = m.to_route
         assert_equal(/.+?/, requirements[:rest])
       end