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module ActionDispatch
module Routing
class Mapper
class Constraints
def self.new(app, constraints = [])
if constraints.any?
super(app, constraints)
else
app
end
end
def initialize(app, constraints = [])
@app, @constraints = app, constraints
end
def call(env)
req = Rack::Request.new(env)
@constraints.each { |constraint|
if constraint.respond_to?(:matches?) && !constraint.matches?(req)
return [ 404, {'X-Cascade' => 'pass'}, [] ]
elsif constraint.respond_to?(:call) && !constraint.call(req)
return [ 404, {'X-Cascade' => 'pass'}, [] ]
end
}
@app.call(env)
end
end
class Mapping
def initialize(set, scope, args)
@set, @scope = set, scope
@path, @options = extract_path_and_options(args)
end
def to_route
[ app, conditions, requirements, defaults, @options[:as] ]
end
private
def extract_path_and_options(args)
options = args.extract_options!
case
when using_to_shorthand?(args, options)
path, to = options.find { |name, value| name.is_a?(String) }
options.merge!(:to => to).delete(path) if path
when using_match_shorthand?(args, options)
path = args.first
options = { :to => path.gsub("/", "#"), :as => path.gsub("/", "_") }
else
path = args.first
end
[ normalize_path(path), options ]
end
# match "account" => "account#index"
def using_to_shorthand?(args, options)
args.empty? && options.present?
end
# match "account/overview"
def using_match_shorthand?(args, options)
args.present? && options.except(:via).empty? && !args.first.include?(':')
end
def normalize_path(path)
path = "#{@scope[:path]}/#{path}"
raise ArgumentError, "path is required" if path.empty?
Mapper.normalize_path(path)
end
def app
Constraints.new(
to.respond_to?(:call) ? to : Routing::RouteSet::Dispatcher.new(:defaults => defaults),
blocks
)
end
def conditions
{ :path_info => @path }.merge(constraints).merge(request_method_condition)
end
def requirements
@requirements ||= returning(@options[:constraints] || {}) do |requirements|
requirements.reverse_merge!(@scope[:constraints]) if @scope[:constraints]
@options.each { |k, v| requirements[k] = v if v.is_a?(Regexp) }
requirements[:controller] ||= @set.controller_constraints
end
end
def defaults
@defaults ||= if to.respond_to?(:call)
{ }
else
defaults = case to
when String
controller, action = to.split('#')
{ :controller => controller, :action => action }
when Symbol
{ :action => to.to_s }.merge(default_controller ? { :controller => default_controller } : {})
else
default_controller ? { :controller => default_controller } : {}
end
if defaults[:controller].blank? && segment_keys.exclude?("controller")
raise ArgumentError, "missing :controller"
end
if defaults[:action].blank? && segment_keys.exclude?("action")
raise ArgumentError, "missing :action"
end
defaults
end
end
def blocks
if @options[:constraints].present? && !@options[:constraints].is_a?(Hash)
block = @options[:constraints]
else
block = nil
end
((@scope[:blocks] || []) + [ block ]).compact
end
def constraints
@constraints ||= requirements.reject { |k, v| segment_keys.include?(k.to_s) || k == :controller }
end
def request_method_condition
if via = @options[:via]
via = Array(via).map { |m| m.to_s.upcase }
{ :request_method => Regexp.union(*via) }
else
{ }
end
end
def segment_keys
@segment_keys ||= Rack::Mount::RegexpWithNamedGroups.new(
Rack::Mount::Strexp.compile(@path, requirements, SEPARATORS)
).names
end
def to
@options[:to]
end
def default_controller
@scope[:controller].to_s if @scope[:controller]
end
end
# Invokes Rack::Mount::Utils.normalize path and ensure that
# (:locale) becomes (/:locale) instead of /(:locale). Except
# for root cases, where the latter is the correct one.
def self.normalize_path(path)
path = Rack::Mount::Utils.normalize_path(path)
path.sub!(%r{/(\(+)/?:}, '\1/:') unless path =~ %r{^/\(+:.*\)$}
path
end
module Base
def initialize(set)
@set = set
end
def root(options = {})
match '/', options.reverse_merge(:as => :root)
end
def match(*args)
@set.add_route(*Mapping.new(@set, @scope, args).to_route)
self
end
end
module HttpHelpers
def get(*args, &block)
map_method(:get, *args, &block)
end
def post(*args, &block)
map_method(:post, *args, &block)
end
def put(*args, &block)
map_method(:put, *args, &block)
end
def delete(*args, &block)
map_method(:delete, *args, &block)
end
def redirect(*args, &block)
options = args.last.is_a?(Hash) ? args.pop : {}
path = args.shift || block
path_proc = path.is_a?(Proc) ? path : proc { |params| path % params }
status = options[:status] || 301
body = 'Moved Permanently'
lambda do |env|
req = Request.new(env)
uri = URI.parse(path_proc.call(req.symbolized_path_parameters))
uri.scheme ||= req.scheme
uri.host ||= req.host
uri.port ||= req.port unless req.port == 80
headers = {
'Location' => uri.to_s,
'Content-Type' => 'text/html',
'Content-Length' => body.length.to_s
}
[ status, headers, [body] ]
end
end
private
def map_method(method, *args, &block)
options = args.extract_options!
options[:via] = method
args.push(options)
match(*args, &block)
self
end
end
module Scoping
def initialize(*args)
@scope = {}
super
end
def scope(*args)
options = args.extract_options!
case args.first
when String
options[:path] = args.first
when Symbol
options[:controller] = args.first
end
recover = {}
options[:constraints] ||= {}
unless options[:constraints].is_a?(Hash)
block, options[:constraints] = options[:constraints], {}
end
scope_options.each do |option|
if value = options.delete(option)
recover[option] = @scope[option]
@scope[option] = send("merge_#{option}_scope", @scope[option], value)
end
end
recover[:block] = @scope[:blocks]
@scope[:blocks] = merge_blocks_scope(@scope[:blocks], block)
recover[:options] = @scope[:options]
@scope[:options] = merge_options_scope(@scope[:options], options)
yield
self
ensure
scope_options.each do |option|
@scope[option] = recover[option] if recover.has_key?(option)
end
@scope[:options] = recover[:options]
@scope[:blocks] = recover[:block]
end
def controller(controller)
scope(controller.to_sym) { yield }
end
def namespace(path)
scope(path.to_s, :name_prefix => path.to_s, :namespace => path.to_s) { yield }
end
def constraints(constraints = {})
scope(:constraints => constraints) { yield }
end
def match(*args)
options = args.extract_options!
options = (@scope[:options] || {}).merge(options)
if @scope[:name_prefix] && !options[:as].blank?
options[:as] = "#{@scope[:name_prefix]}_#{options[:as]}"
elsif @scope[:name_prefix] && options[:as] == ""
options[:as] = @scope[:name_prefix].to_s
end
args.push(options)
super(*args)
end
private
def scope_options
@scope_options ||= private_methods.grep(/^merge_(.+)_scope$/) { $1.to_sym }
end
def merge_path_scope(parent, child)
Mapper.normalize_path("#{parent}/#{child}")
end
def merge_name_prefix_scope(parent, child)
parent ? "#{parent}_#{child}" : child
end
def merge_namespace_scope(parent, child)
parent ? "#{parent}/#{child}" : child
end
def merge_controller_scope(parent, child)
@scope[:namespace] ? "#{@scope[:namespace]}/#{child}" : child
end
def merge_resources_path_names_scope(parent, child)
merge_options_scope(parent, child)
end
def merge_constraints_scope(parent, child)
merge_options_scope(parent, child)
end
def merge_blocks_scope(parent, child)
(parent || []) + [child]
end
def merge_options_scope(parent, child)
(parent || {}).merge(child)
end
end
module Resources
CRUD_ACTIONS = [:index, :show, :create, :update, :destroy]
class Resource #:nodoc:
def self.default_actions
[:index, :create, :new, :show, :update, :destroy, :edit]
end
attr_reader :plural, :singular, :options
def initialize(entities, options = {})
entities = entities.to_s
@options = options
@plural = entities.pluralize
@singular = entities.singularize
end
def default_actions
self.class.default_actions
end
def actions
if only = options[:only]
only.map(&:to_sym)
elsif except = options[:except]
default_actions - except.map(&:to_sym)
else
default_actions
end
end
def action_type(action)
case action
when :index, :create
:collection
when :show, :update, :destroy
:member
end
end
def name
options[:as] || plural
end
def controller
options[:controller] || plural
end
def member_name
singular
end
def collection_name
plural
end
def name_for_action(action)
case action_type(action)
when :collection
collection_name
when :member
member_name
end
end
def id_segment
":#{singular}_id"
end
end
class SingletonResource < Resource #:nodoc:
def self.default_actions
[:show, :create, :update, :destroy, :new, :edit]
end
def initialize(entity, options = {})
super
end
def action_type(action)
case action
when :show, :create, :update, :destroy
:member
end
end
def name
options[:as] || singular
end
end
def initialize(*args)
super
@scope[:resources_path_names] = @set.resources_path_names
end
def resource(*resources, &block)
options = resources.extract_options!
if verify_common_behavior_for(:resource, resources, options, &block)
return self
end
resource = SingletonResource.new(resources.pop, options)
scope(:path => resource.name.to_s, :controller => resource.controller) do
with_scope_level(:resource, resource) do
yield if block_given?
get :show if resource.actions.include?(:show)
post :create if resource.actions.include?(:create)
put :update if resource.actions.include?(:update)
delete :destroy if resource.actions.include?(:destroy)
get :new, :as => resource.singular if resource.actions.include?(:new)
get :edit, :as => resource.singular if resource.actions.include?(:edit)
end
end
self
end
def resources(*resources, &block)
options = resources.extract_options!
if verify_common_behavior_for(:resources, resources, options, &block)
return self
end
resource = Resource.new(resources.pop, options)
scope(:path => resource.name.to_s, :controller => resource.controller) do
with_scope_level(:resources, resource) do
yield if block_given?
with_scope_level(:collection) do
get :index if resource.actions.include?(:index)
post :create if resource.actions.include?(:create)
get :new, :as => resource.singular if resource.actions.include?(:new)
end
with_scope_level(:member) do
scope(':id') do
get :show if resource.actions.include?(:show)
put :update if resource.actions.include?(:update)
delete :destroy if resource.actions.include?(:destroy)
get :edit, :as => resource.singular if resource.actions.include?(:edit)
end
end
end
end
self
end
def collection
unless @scope[:scope_level] == :resources
raise ArgumentError, "can't use collection outside resources scope"
end
with_scope_level(:collection) do
scope(:name_prefix => parent_resource.collection_name, :as => "") do
yield
end
end
end
def member
unless @scope[:scope_level] == :resources
raise ArgumentError, "can't use member outside resources scope"
end
with_scope_level(:member) do
scope(':id', :name_prefix => parent_resource.member_name, :as => "") do
yield
end
end
end
def nested
unless @scope[:scope_level] == :resources
raise ArgumentError, "can't use nested outside resources scope"
end
with_scope_level(:nested) do
scope(parent_resource.id_segment, :name_prefix => parent_resource.member_name) do
yield
end
end
end
def match(*args)
options = args.extract_options!
if args.length > 1
args.each { |path| match(path, options) }
return self
end
resources_path_names = options.delete(:path_names)
if args.first.is_a?(Symbol)
action = args.first
if CRUD_ACTIONS.include?(action)
begin
old_path = @scope[:path]
@scope[:path] = "#{@scope[:path]}(.:format)"
return match(options.reverse_merge(
:to => action,
:as => parent_resource.name_for_action(action)
))
ensure
@scope[:path] = old_path
end
else
with_exclusive_name_prefix(action) do
return match("#{action_path(action, resources_path_names)}(.:format)", options.reverse_merge(:to => action))
end
end
end
args.push(options)
case options.delete(:on)
when :collection
return collection { match(*args) }
when :member
return member { match(*args) }
end
if @scope[:scope_level] == :resources
raise ArgumentError, "can't define route directly in resources scope"
end
super
end
protected
def parent_resource
@scope[:scope_level_resource]
end
private
def action_path(name, path_names = nil)
path_names ||= @scope[:resources_path_names]
path_names[name.to_sym] || name.to_s
end
def verify_common_behavior_for(method, resources, options, &block)
if resources.length > 1
resources.each { |r| send(method, r, options, &block) }
return true
end
if path_names = options.delete(:path_names)
scope(:resources_path_names => path_names) do
send(method, resources.pop, options, &block)
end
return true
end
if @scope[:scope_level] == :resources
nested do
send(method, resources.pop, options, &block)
end
return true
end
false
end
def with_exclusive_name_prefix(prefix)
begin
old_name_prefix = @scope[:name_prefix]
if !old_name_prefix.blank?
@scope[:name_prefix] = "#{prefix}_#{@scope[:name_prefix]}"
else
@scope[:name_prefix] = prefix.to_s
end
yield
ensure
@scope[:name_prefix] = old_name_prefix
end
end
def with_scope_level(kind, resource = parent_resource)
old, @scope[:scope_level] = @scope[:scope_level], kind
old_resource, @scope[:scope_level_resource] = @scope[:scope_level_resource], resource
yield
ensure
@scope[:scope_level] = old
@scope[:scope_level_resource] = old_resource
end
end
include Base
include HttpHelpers
include Scoping
include Resources
end
end
end
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