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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 = nil if path == ""
path = "#{@scope[:path]}#{path}" if @scope[:path]
path = Rack::Mount::Utils.normalize_path(path) if path
raise ArgumentError, "path is required" unless 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
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
lambda do |env|
req = Rack::Request.new(env)
params = path_proc.call(env["action_dispatch.request.path_parameters"])
url = req.scheme + '://' + req.host + params
[ status, {'Location' => url, 'Content-Type' => 'text/html'}, ['Moved Permanently'] ]
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
if path = options.delete(:path)
path_set = true
path, @scope[:path] = @scope[:path], Rack::Mount::Utils.normalize_path(@scope[:path].to_s + path.to_s)
else
path_set = false
end
if name_prefix = options.delete(:name_prefix)
name_prefix_set = true
name_prefix, @scope[:name_prefix] = @scope[:name_prefix], (@scope[:name_prefix] ? "#{@scope[:name_prefix]}_#{name_prefix}" : name_prefix)
else
name_prefix_set = false
end
if controller = options.delete(:controller)
controller_set = true
controller, @scope[:controller] = @scope[:controller], controller
else
controller_set = false
end
constraints = options.delete(:constraints) || {}
unless constraints.is_a?(Hash)
block, constraints = constraints, {}
end
constraints, @scope[:constraints] = @scope[:constraints], (@scope[:constraints] || {}).merge(constraints)
blocks, @scope[:blocks] = @scope[:blocks], (@scope[:blocks] || []) + [block]
options, @scope[:options] = @scope[:options], (@scope[:options] || {}).merge(options)
yield
self
ensure
@scope[:path] = path if path_set
@scope[:name_prefix] = name_prefix if name_prefix_set
@scope[:controller] = controller if controller_set
@scope[:options] = options
@scope[:blocks] = blocks
@scope[:constraints] = constraints
end
def controller(controller)
scope(controller.to_sym) { yield }
end
def namespace(path)
scope("/#{path}") { 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
end
module Resources
class Resource #:nodoc:
attr_reader :plural, :singular
def initialize(entities, options = {})
entities = entities.to_s
@plural = entities.pluralize
@singular = entities.singularize
end
def name
plural
end
def controller
plural
end
def member_name
singular
end
def collection_name
plural
end
def id_segment
":#{singular}_id"
end
end
class SingletonResource < Resource #:nodoc:
def initialize(entity, options = {})
super
end
def name
singular
end
end
def resource(*resources, &block)
options = resources.extract_options!
if resources.length > 1
raise ArgumentError if block_given?
resources.each { |r| resource(r, options) }
return self
end
resource = SingletonResource.new(resources.pop)
if @scope[:scope_level] == :resources
nested do
resource(resource.name, options, &block)
end
return self
end
scope(:path => "/#{resource.name}", :controller => resource.controller) do
with_scope_level(:resource, resource) do
yield if block_given?
get "(.:format)", :to => :show, :as => resource.member_name
post "(.:format)", :to => :create
put "(.:format)", :to => :update
delete "(.:format)", :to => :destroy
get "/new(.:format)", :to => :new, :as => "new_#{resource.singular}"
get "/edit(.:format)", :to => :edit, :as => "edit_#{resource.singular}"
end
end
self
end
def resources(*resources, &block)
options = resources.extract_options!
if resources.length > 1
raise ArgumentError if block_given?
resources.each { |r| resources(r, options) }
return self
end
resource = Resource.new(resources.pop)
if @scope[:scope_level] == :resources
nested do
resources(resource.name, options, &block)
end
return self
end
scope(:path => "/#{resource.name}", :controller => resource.controller) do
with_scope_level(:resources, resource) do
yield if block_given?
with_scope_level(:collection) do
get "(.:format)", :to => :index, :as => resource.collection_name
post "(.:format)", :to => :create
with_exclusive_name_prefix :new do
get "/new(.:format)", :to => :new, :as => resource.singular
end
end
with_scope_level(:member) do
scope("/:id") do
get "(.:format)", :to => :show, :as => resource.member_name
put "(.:format)", :to => :update
delete "(.:format)", :to => :destroy
with_exclusive_name_prefix :edit do
get "/edit(.:format)", :to => :edit, :as => resource.singular
end
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
if args.first.is_a?(Symbol)
with_exclusive_name_prefix(args.first) do
return match("/#{args.first}(.:format)", options.merge(:to => args.first.to_sym))
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 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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