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require 'cgi'
class Object
def to_param
to_s
end
end
class TrueClass
def to_param
self
end
end
class FalseClass
def to_param
self
end
end
class NilClass
def to_param
self
end
end
class Regexp
def number_of_captures
Regexp.new("|#{source}").match('').captures.length
end
class << self
def optionalize(pattern)
case unoptionalize(pattern)
when /\A(.|\(.*\))\Z/ then "#{pattern}?"
else "(?:#{pattern})?"
end
end
def unoptionalize(pattern)
[/\A\(\?:(.*)\)\?\Z/, /\A(.|\(.*\))\?\Z/].each do |regexp|
return $1 if regexp =~ pattern
end
return pattern
end
end
end
module ActionController
# == Routing
#
# The routing module provides URL rewriting in native Ruby. It's a way to
# redirect incoming requests to controllers and actions. This replaces
# mod_rewrite rules. Best of all Rails' Routing works with any web server.
# Routes are defined in routes.rb in your RAILS_ROOT/config directory.
#
# Consider the following route, installed by Rails when you generate your
# application:
#
# map.connect ':controller/:action/:id'
#
# This route states that it expects requests to consist of a
# :controller followed by an :action that in turns is fed by some :id
#
# Suppose you get an incoming request for <tt>/blog/edit/22</tt>, you'll end up
# with:
#
# params = { :controller => 'blog',
# :action => 'edit'
# :id => '22'
# }
#
# Think of creating routes as drawing a map for your requests. The map tells
# them where to go based on some predefined pattern:
#
# ActionController::Routing::Routes.draw do |map|
# Pattern 1 tells some request to go to one place
# Pattern 2 tell them to go to another
# ...
# end
#
# The following symbols are special:
#
# :controller maps to your controller name
# :action maps to an action with your controllers
#
# Other names simply map to a parameter as in the case of +:id+.
#
# == Route priority
#
# Not all routes are created equally. Routes have priority defined by the
# order of appearance of the routes in the routes.rb file. The priority goes
# from top to bottom. The last route in that file is at the lowest priority
# will be applied last. If no route matches, 404 is returned.
#
# Within blocks, the empty pattern goes first i.e. is at the highest priority.
# In practice this works out nicely:
#
# ActionController::Routing::Routes.draw do |map|
# map.with_options :controller => 'blog' do |blog|
# blog.show '', :action => 'list'
# end
# map.connect ':controller/:action/:view
# end
#
# In this case, invoking blog controller (with an URL like '/blog/')
# without parameters will activate the 'list' action by default.
#
# == Defaults routes and default parameters
#
# Setting a default route is straightforward in Rails because by appending a
# Hash to the end of your mapping you can set default parameters.
#
# Example:
# ActionController::Routing:Routes.draw do |map|
# map.connect ':controller/:action/:id', :controller => 'blog'
# end
#
# This sets up +blog+ as the default controller if no other is specified.
# This means visiting '/' would invoke the blog controller.
#
# More formally, you can define defaults in a route with the +:defaults+ key.
#
# map.connect ':controller/:id/:action', :action => 'show', :defaults => { :page => 'Dashboard' }
#
# == Named routes
#
# Routes can be named with the syntax <tt>map.name_of_route options</tt>,
# allowing for easy reference within your source as +name_of_route_url+.
#
# Example:
# # In routes.rb
# map.login 'login', :controller => 'accounts', :action => 'login'
#
# # With render, redirect_to, tests, etc.
# redirect_to login_url
#
# Arguments can be passed as well.
#
# redirect_to show_item_url(:id => 25)
#
# When using +with_options+, the name goes after the item passed to the block.
#
# ActionController::Routing::Routes.draw do |map|
# map.with_options :controller => 'blog' do |blog|
# blog.show '', :action => 'list'
# blog.delete 'delete/:id', :action => 'delete',
# blog.edit 'edit/:id', :action => 'edit'
# end
# map.connect ':controller/:action/:view
# end
#
# You would then use the named routes in your views:
#
# link_to @article.title, show_url(:id => @article.id)
#
# == Pretty URL's
#
# Routes can generate pretty URLs. For example:
#
# map.connect 'articles/:year/:month/:day',
# :controller => 'articles',
# :action => 'find_by_date',
# :year => /\d{4}/,
# :month => /\d{1,2}/,
# :day => /\d{1,2}/
#
# # Using the route above, the url below maps to:
# # params = {:year => '2005', :month => '11', :day => '06'}
# # http://localhost:3000/articles/2005/11/06
#
# == Regular Expressions and parameters
# You can specify a reqular expression to define a format for a parameter.
#
# map.geocode 'geocode/:postalcode', :controller => 'geocode',
# :action => 'show', :postalcode => /\d{5}(-\d{4})?/
#
# or more formally:
#
# map.geocode 'geocode/:postalcode', :controller => 'geocode',
# :action => 'show',
# :requirements { :postalcode => /\d{5}(-\d{4})?/ }
#
# == Route globbing
#
# Specifying <tt>*[string]</tt> as part of a rule like :
#
# map.connect '*path' , :controller => 'blog' , :action => 'unrecognized?'
#
# will glob all remaining parts of the route that were not recognized earlier. This idiom must appear at the end of the path. The globbed values are in <tt>params[:path]</tt> in this case.
#
# == Reloading routes
#
# You can reload routes if you feel you must:
#
# Action::Controller::Routes.reload
#
# This will clear all named routes and reload routes.rb
#
# == Testing Routes
#
# The two main methods for testing your routes:
#
# === +assert_routing+
#
# def test_movie_route_properly_splits
# opts = {:controller => "plugin", :action => "checkout", :id => "2"}
# assert_routing "plugin/checkout/2", opts
# end
#
# +assert_routing+ lets you test whether or not the route properly resolves into options.
#
# === +assert_recognizes+
#
# def test_route_has_options
# opts = {:controller => "plugin", :action => "show", :id => "12"}
# assert_recognizes opts, "/plugins/show/12"
# end
#
# Note the subtle difference between the two: +assert_routing+ tests that
# an URL fits options while +assert_recognizes+ tests that an URL
# breaks into parameters properly.
#
# In tests you can simply pass the URL or named route to +get+ or +post+.
#
# def send_to_jail
# get '/jail'
# assert_response :success
# assert_template "jail/front"
# end
#
# def goes_to_login
# get login_url
# #...
# end
#
module Routing
SEPARATORS = %w( / ; . , ? )
# The root paths which may contain controller files
mattr_accessor :controller_paths
self.controller_paths = []
class << self
def with_controllers(names)
prior_controllers = @possible_controllers
use_controllers! names
yield
ensure
use_controllers! prior_controllers
end
def normalize_paths(paths)
# do the hokey-pokey of path normalization...
paths = paths.collect do |path|
path = path.
gsub("//", "/"). # replace double / chars with a single
gsub("\\\\", "\\"). # replace double \ chars with a single
gsub(%r{(.)[\\/]$}, '\1') # drop final / or \ if path ends with it
# eliminate .. paths where possible
re = %r{\w+[/\\]\.\.[/\\]}
path.gsub!(%r{\w+[/\\]\.\.[/\\]}, "") while path.match(re)
path
end
# start with longest path, first
paths = paths.uniq.sort_by { |path| - path.length }
end
def possible_controllers
unless @possible_controllers
@possible_controllers = []
paths = controller_paths.select { |path| File.directory?(path) && path != "." }
seen_paths = Hash.new {|h, k| h[k] = true; false}
normalize_paths(paths).each do |load_path|
Dir["#{load_path}/**/*_controller.rb"].collect do |path|
next if seen_paths[path.gsub(%r{^\.[/\\]}, "")]
controller_name = path[(load_path.length + 1)..-1]
controller_name.gsub!(/_controller\.rb\Z/, '')
@possible_controllers << controller_name
end
end
# remove duplicates
@possible_controllers.uniq!
end
@possible_controllers
end
def use_controllers!(controller_names)
@possible_controllers = controller_names
end
def controller_relative_to(controller, previous)
if controller.nil? then previous
elsif controller[0] == ?/ then controller[1..-1]
elsif %r{^(.*)/} =~ previous then "#{$1}/#{controller}"
else controller
end
end
end
class Route
attr_accessor :segments, :requirements, :conditions
def initialize
@segments = []
@requirements = {}
@conditions = {}
end
# Write and compile a +generate+ method for this Route.
def write_generation
# Build the main body of the generation
body = "expired = false\n#{generation_extraction}\n#{generation_structure}"
# If we have conditions that must be tested first, nest the body inside an if
body = "if #{generation_requirements}\n#{body}\nend" if generation_requirements
args = "options, hash, expire_on = {}"
# Nest the body inside of a def block, and then compile it.
raw_method = method_decl = "def generate_raw(#{args})\npath = begin\n#{body}\nend\n[path, hash]\nend"
instance_eval method_decl, "generated code (#{__FILE__}:#{__LINE__})"
# expire_on.keys == recall.keys; in other words, the keys in the expire_on hash
# are the same as the keys that were recalled from the previous request. Thus,
# we can use the expire_on.keys to determine which keys ought to be used to build
# the query string. (Never use keys from the recalled request when building the
# query string.)
method_decl = "def generate(#{args})\npath, hash = generate_raw(options, hash, expire_on)\nappend_query_string(path, hash, extra_keys(hash, expire_on))\nend"
instance_eval method_decl, "generated code (#{__FILE__}:#{__LINE__})"
method_decl = "def generate_extras(#{args})\npath, hash = generate_raw(options, hash, expire_on)\n[path, extra_keys(hash, expire_on)]\nend"
instance_eval method_decl, "generated code (#{__FILE__}:#{__LINE__})"
raw_method
end
# Build several lines of code that extract values from the options hash. If any
# of the values are missing or rejected then a return will be executed.
def generation_extraction
segments.collect do |segment|
segment.extraction_code
end.compact * "\n"
end
# Produce a condition expression that will check the requirements of this route
# upon generation.
def generation_requirements
requirement_conditions = requirements.collect do |key, req|
if req.is_a? Regexp
value_regexp = Regexp.new "\\A#{req.source}\\Z"
"hash[:#{key}] && #{value_regexp.inspect} =~ options[:#{key}]"
else
"hash[:#{key}] == #{req.inspect}"
end
end
requirement_conditions * ' && ' unless requirement_conditions.empty?
end
def generation_structure
segments.last.string_structure segments[0..-2]
end
# Write and compile a +recognize+ method for this Route.
def write_recognition
# Create an if structure to extract the params from a match if it occurs.
body = "params = parameter_shell.dup\n#{recognition_extraction * "\n"}\nparams"
body = "if #{recognition_conditions.join(" && ")}\n#{body}\nend"
# Build the method declaration and compile it
method_decl = "def recognize(path, env={})\n#{body}\nend"
instance_eval method_decl, "generated code (#{__FILE__}:#{__LINE__})"
method_decl
end
# Plugins may override this method to add other conditions, like checks on
# host, subdomain, and so forth. Note that changes here only affect route
# recognition, not generation.
def recognition_conditions
result = ["(match = #{Regexp.new(recognition_pattern).inspect}.match(path))"]
result << "conditions[:method] === env[:method]" if conditions[:method]
result
end
# Build the regular expression pattern that will match this route.
def recognition_pattern(wrap = true)
pattern = ''
segments.reverse_each do |segment|
pattern = segment.build_pattern pattern
end
wrap ? ("\\A" + pattern + "\\Z") : pattern
end
# Write the code to extract the parameters from a matched route.
def recognition_extraction
next_capture = 1
extraction = segments.collect do |segment|
x = segment.match_extraction next_capture
next_capture += Regexp.new(segment.regexp_chunk).number_of_captures
x
end
extraction.compact
end
# Write the real generation implementation and then resend the message.
def generate(options, hash, expire_on = {})
write_generation
generate options, hash, expire_on
end
def generate_extras(options, hash, expire_on = {})
write_generation
generate_extras options, hash, expire_on
end
# Generate the query string with any extra keys in the hash and append
# it to the given path, returning the new path.
def append_query_string(path, hash, query_keys=nil)
return nil unless path
query_keys ||= extra_keys(hash)
"#{path}#{build_query_string(hash, query_keys)}"
end
# Determine which keys in the given hash are "extra". Extra keys are
# those that were not used to generate a particular route. The extra
# keys also do not include those recalled from the prior request, nor
# do they include any keys that were implied in the route (like a
# :controller that is required, but not explicitly used in the text of
# the route.)
def extra_keys(hash, recall={})
(hash || {}).keys.map { |k| k.to_sym } - (recall || {}).keys - significant_keys
end
# Build a query string from the keys of the given hash. If +only_keys+
# is given (as an array), only the keys indicated will be used to build
# the query string. The query string will correctly build array parameter
# values.
def build_query_string(hash, only_keys=nil)
elements = []
only_keys ||= hash.keys
only_keys.each do |key|
value = hash[key] or next
key = CGI.escape key.to_s
if value.class == Array
key << '[]'
else
value = [ value ]
end
value.each { |val| elements << "#{key}=#{CGI.escape(val.to_param.to_s)}" }
end
query_string = "?#{elements.join("&")}" unless elements.empty?
query_string || ""
end
# Write the real recognition implementation and then resend the message.
def recognize(path, environment={})
write_recognition
recognize path, environment
end
# A route's parameter shell contains parameter values that are not in the
# route's path, but should be placed in the recognized hash.
#
# For example, +{:controller => 'pages', :action => 'show'} is the shell for the route:
#
# map.connect '/page/:id', :controller => 'pages', :action => 'show', :id => /\d+/
#
def parameter_shell
@parameter_shell ||= returning({}) do |shell|
requirements.each do |key, requirement|
shell[key] = requirement unless requirement.is_a? Regexp
end
end
end
# Return an array containing all the keys that are used in this route. This
# includes keys that appear inside the path, and keys that have requirements
# placed upon them.
def significant_keys
@significant_keys ||= returning [] do |sk|
segments.each { |segment| sk << segment.key if segment.respond_to? :key }
sk.concat requirements.keys
sk.uniq!
end
end
# Return a hash of key/value pairs representing the keys in the route that
# have defaults, or which are specified by non-regexp requirements.
def defaults
@defaults ||= returning({}) do |hash|
segments.each do |segment|
next unless segment.respond_to? :default
hash[segment.key] = segment.default unless segment.default.nil?
end
requirements.each do |key,req|
next if Regexp === req || req.nil?
hash[key] = req
end
end
end
def matches_controller_and_action?(controller, action)
unless @matching_prepared
@controller_requirement = requirement_for(:controller)
@action_requirement = requirement_for(:action)
@matching_prepared = true
end
(@controller_requirement.nil? || @controller_requirement === controller) &&
(@action_requirement.nil? || @action_requirement === action)
end
def to_s
@to_s ||= begin
segs = segments.inject("") { |str,s| str << s.to_s }
"%-6s %-40s %s" % [(conditions[:method] || :any).to_s.upcase, segs, requirements.inspect]
end
end
protected
def requirement_for(key)
return requirements[key] if requirements.key? key
segments.each do |segment|
return segment.regexp if segment.respond_to?(:key) && segment.key == key
end
nil
end
end
class Segment
attr_accessor :is_optional
alias_method :optional?, :is_optional
def initialize
self.is_optional = false
end
def extraction_code
nil
end
# Continue generating string for the prior segments.
def continue_string_structure(prior_segments)
if prior_segments.empty?
interpolation_statement(prior_segments)
else
new_priors = prior_segments[0..-2]
prior_segments.last.string_structure(new_priors)
end
end
# Return a string interpolation statement for this segment and those before it.
def interpolation_statement(prior_segments)
chunks = prior_segments.collect { |s| s.interpolation_chunk }
chunks << interpolation_chunk
"\"#{chunks * ''}\"#{all_optionals_available_condition(prior_segments)}"
end
def string_structure(prior_segments)
optional? ? continue_string_structure(prior_segments) : interpolation_statement(prior_segments)
end
# Return an if condition that is true if all the prior segments can be generated.
# If there are no optional segments before this one, then nil is returned.
def all_optionals_available_condition(prior_segments)
optional_locals = prior_segments.collect { |s| s.local_name if s.optional? && s.respond_to?(:local_name) }.compact
optional_locals.empty? ? nil : " if #{optional_locals * ' && '}"
end
# Recognition
def match_extraction(next_capture)
nil
end
# Warning
# Returns true if this segment is optional? because of a default. If so, then
# no warning will be emitted regarding this segment.
def optionality_implied?
false
end
end
class StaticSegment < Segment
attr_accessor :value, :raw
alias_method :raw?, :raw
def initialize(value = nil)
super()
self.value = value
end
def interpolation_chunk
raw? ? value : CGI.escape(value)
end
def regexp_chunk
chunk = Regexp.escape value
optional? ? Regexp.optionalize(chunk) : chunk
end
def build_pattern(pattern)
escaped = Regexp.escape(value)
if optional? && ! pattern.empty?
"(?:#{Regexp.optionalize escaped}\\Z|#{escaped}#{Regexp.unoptionalize pattern})"
elsif optional?
Regexp.optionalize escaped
else
escaped + pattern
end
end
def to_s
value
end
end
class DividerSegment < StaticSegment
def initialize(value = nil)
super(value)
self.raw = true
self.is_optional = true
end
def optionality_implied?
true
end
end
class DynamicSegment < Segment
attr_accessor :key, :default, :regexp
def initialize(key = nil, options = {})
super()
self.key = key
self.default = options[:default] if options.key? :default
self.is_optional = true if options[:optional] || options.key?(:default)
end
def to_s
":#{key}"
end
# The local variable name that the value of this segment will be extracted to.
def local_name
"#{key}_value"
end
def extract_value
"#{local_name} = hash[:#{key}] #{"|| #{default.inspect}" if default}"
end
def value_check
if default # Then we know it won't be nil
"#{value_regexp.inspect} =~ #{local_name}" if regexp
elsif optional?
# If we have a regexp check that the value is not given, or that it matches.
# If we have no regexp, return nil since we do not require a condition.
"#{local_name}.nil? || #{value_regexp.inspect} =~ #{local_name}" if regexp
else # Then it must be present, and if we have a regexp, it must match too.
"#{local_name} #{"&& #{value_regexp.inspect} =~ #{local_name}" if regexp}"
end
end
def expiry_statement
"expired, hash = true, options if !expired && expire_on[:#{key}]"
end
def extraction_code
s = extract_value
vc = value_check
s << "\nreturn [nil,nil] unless #{vc}" if vc
s << "\n#{expiry_statement}"
end
def interpolation_chunk
"\#{CGI.escape(#{local_name}.to_s)}"
end
def string_structure(prior_segments)
if optional? # We have a conditional to do...
# If we should not appear in the url, just write the code for the prior
# segments. This occurs if our value is the default value, or, if we are
# optional, if we have nil as our value.
"if #{local_name} == #{default.inspect}\n" +
continue_string_structure(prior_segments) +
"\nelse\n" + # Otherwise, write the code up to here
"#{interpolation_statement(prior_segments)}\nend"
else
interpolation_statement(prior_segments)
end
end
def value_regexp
Regexp.new "\\A#{regexp.source}\\Z" if regexp
end
def regexp_chunk
regexp ? "(#{regexp.source})" : "([^#{Routing::SEPARATORS.join}]+)"
end
def build_pattern(pattern)
chunk = regexp_chunk
chunk = "(#{chunk})" if Regexp.new(chunk).number_of_captures == 0
pattern = "#{chunk}#{pattern}"
optional? ? Regexp.optionalize(pattern) : pattern
end
def match_extraction(next_capture)
hangon = (default ? "|| #{default.inspect}" : "if match[#{next_capture}]")
# All non code-related keys (such as :id, :slug) have to be unescaped as other CGI params
"params[:#{key}] = match[#{next_capture}] #{hangon}"
end
def optionality_implied?
[:action, :id].include? key
end
end
class ControllerSegment < DynamicSegment
def regexp_chunk
possible_names = Routing.possible_controllers.collect { |name| Regexp.escape name }
"(?i-:(#{(regexp || Regexp.union(*possible_names)).source}))"
end
# Don't CGI.escape the controller name, since it may have slashes in it,
# like admin/foo.
def interpolation_chunk
"\#{#{local_name}.to_s}"
end
# Make sure controller names like Admin/Content are correctly normalized to
# admin/content
def extract_value
"#{local_name} = (hash[:#{key}] #{"|| #{default.inspect}" if default}).downcase"
end
def match_extraction(next_capture)
if default
"params[:#{key}] = match[#{next_capture}] ? match[#{next_capture}].downcase : '#{default}'"
else
"params[:#{key}] = match[#{next_capture}].downcase if match[#{next_capture}]"
end
end
end
class PathSegment < DynamicSegment
EscapedSlash = CGI.escape("/")
def interpolation_chunk
"\#{CGI.escape(#{local_name}.to_s).gsub(#{EscapedSlash.inspect}, '/')}"
end
def default
''
end
def default=(path)
raise RoutingError, "paths cannot have non-empty default values" unless path.blank?
end
def match_extraction(next_capture)
"params[:#{key}] = PathSegment::Result.new_escaped((match[#{next_capture}]#{" || " + default.inspect if default}).split('/'))#{" if match[" + next_capture + "]" if !default}"
end
def regexp_chunk
regexp || "(.*)"
end
class Result < ::Array #:nodoc:
def to_s() join '/' end
def self.new_escaped(strings)
new strings.collect {|str| CGI.unescape str}
end
end
end
class RouteBuilder
attr_accessor :separators, :optional_separators
def initialize
self.separators = Routing::SEPARATORS
self.optional_separators = %w( / )
end
def separator_pattern(inverted = false)
"[#{'^' if inverted}#{Regexp.escape(separators.join)}]"
end
def interval_regexp
Regexp.new "(.*?)(#{separators.source}|$)"
end
# Accepts a "route path" (a string defining a route), and returns the array
# of segments that corresponds to it. Note that the segment array is only
# partially initialized--the defaults and requirements, for instance, need
# to be set separately, via the #assign_route_options method, and the
# #optional? method for each segment will not be reliable until after
# #assign_route_options is called, as well.
def segments_for_route_path(path)
rest, segments = path, []
until rest.empty?
segment, rest = segment_for rest
segments << segment
end
segments
end
# A factory method that returns a new segment instance appropriate for the
# format of the given string.
def segment_for(string)
segment = case string
when /\A:(\w+)/
key = $1.to_sym
case key
when :controller then ControllerSegment.new(key)
else DynamicSegment.new key
end
when /\A\*(\w+)/ then PathSegment.new($1.to_sym, :optional => true)
when /\A\?(.*?)\?/
returning segment = StaticSegment.new($1) do
segment.is_optional = true
end
when /\A(#{separator_pattern(:inverted)}+)/ then StaticSegment.new($1)
when Regexp.new(separator_pattern) then
returning segment = DividerSegment.new($&) do
segment.is_optional = (optional_separators.include? $&)
end
end
[segment, $~.post_match]
end
# Split the given hash of options into requirement and default hashes. The
# segments are passed alongside in order to distinguish between default values
# and requirements.
def divide_route_options(segments, options)
options = options.dup
requirements = (options.delete(:requirements) || {}).dup
defaults = (options.delete(:defaults) || {}).dup
conditions = (options.delete(:conditions) || {}).dup
path_keys = segments.collect { |segment| segment.key if segment.respond_to?(:key) }.compact
options.each do |key, value|
hash = (path_keys.include?(key) && ! value.is_a?(Regexp)) ? defaults : requirements
hash[key] = value
end
[defaults, requirements, conditions]
end
# Takes a hash of defaults and a hash of requirements, and assigns them to
# the segments. Any unused requirements (which do not correspond to a segment)
# are returned as a hash.
def assign_route_options(segments, defaults, requirements)
route_requirements = {} # Requirements that do not belong to a segment
segment_named = Proc.new do |key|
segments.detect { |segment| segment.key == key if segment.respond_to?(:key) }
end
requirements.each do |key, requirement|
segment = segment_named[key]
if segment
raise TypeError, "#{key}: requirements on a path segment must be regular expressions" unless requirement.is_a?(Regexp)
if requirement.source =~ %r{\A(\\A|\^)|(\\Z|\\z|\$)\Z}
raise ArgumentError, "Regexp anchor characters are not allowed in routing requirements: #{requirement.inspect}"
end
segment.regexp = requirement
else
route_requirements[key] = requirement
end
end
defaults.each do |key, default|
segment = segment_named[key]
raise ArgumentError, "#{key}: No matching segment exists; cannot assign default" unless segment
segment.is_optional = true
segment.default = default.to_param if default
end
assign_default_route_options(segments)
ensure_required_segments(segments)
route_requirements
end
# Assign default options, such as 'index' as a default for :action. This
# method must be run *after* user supplied requirements and defaults have
# been applied to the segments.
def assign_default_route_options(segments)
segments.each do |segment|
next unless segment.is_a? DynamicSegment
case segment.key
when :action
if segment.regexp.nil? || segment.regexp.match('index').to_s == 'index'
segment.default ||= 'index'
segment.is_optional = true
end
when :id
if segment.default.nil? && segment.regexp.nil? || segment.regexp =~ ''
segment.is_optional = true
end
end
end
end
# Makes sure that there are no optional segments that precede a required
# segment. If any are found that precede a required segment, they are
# made required.
def ensure_required_segments(segments)
allow_optional = true
segments.reverse_each do |segment|
allow_optional &&= segment.optional?
if !allow_optional && segment.optional?
unless segment.optionality_implied?
warn "Route segment \"#{segment.to_s}\" cannot be optional because it precedes a required segment. This segment will be required."
end
segment.is_optional = false
elsif allow_optional & segment.respond_to?(:default) && segment.default
# if a segment has a default, then it is optional
segment.is_optional = true
end
end
end
# Construct and return a route with the given path and options.
def build(path, options)
# Wrap the path with slashes
path = "/#{path}" unless path[0] == ?/
path = "#{path}/" unless path[-1] == ?/
segments = segments_for_route_path(path)
defaults, requirements, conditions = divide_route_options(segments, options)
requirements = assign_route_options(segments, defaults, requirements)
route = Route.new
route.segments = segments
route.requirements = requirements
route.conditions = conditions
if !route.significant_keys.include?(:action) && !route.requirements[:action]
route.requirements[:action] = "index"
route.significant_keys << :action
end
route
end
end
class RouteSet
# Mapper instances are used to build routes. The object passed to the draw
# block in config/routes.rb is a Mapper instance.
#
# Mapper instances have relatively few instance methods, in order to avoid
# clashes with named routes.
class Mapper
def initialize(set)
@set = set
end
# Create an unnamed route with the provided +path+ and +options+. See
# SomeHelpfulUrl for an introduction to routes.
def connect(path, options = {})
@set.add_route(path, options)
end
def named_route(name, path, options = {})
@set.add_named_route(name, path, options)
end
def method_missing(route_name, *args, &proc)
super unless args.length >= 1 && proc.nil?
@set.add_named_route(route_name, *args)
end
end
# A NamedRouteCollection instance is a collection of named routes, and also
# maintains an anonymous module that can be used to install helpers for the
# named routes.
class NamedRouteCollection
include Enumerable
attr_reader :routes, :helpers
def initialize
clear!
end
def clear!
@routes = {}
@helpers = []
@module = Module.new
end
def add(name, route)
routes[name.to_sym] = route
define_named_route_methods(name, route)
end
def get(name)
routes[name.to_sym]
end
alias []= add
alias [] get
alias clear clear!
def each
routes.each { |name, route| yield name, route }
self
end
def names
routes.keys
end
def length
routes.length
end
def install(destinations = [ActionController::Base, ActionView::Base])
Array(destinations).each { |dest| dest.send :include, @module }
end
private
def url_helper_name(name, kind = :url)
:"#{name}_#{kind}"
end
def hash_access_name(name, kind = :url)
:"hash_for_#{name}_#{kind}"
end
def define_named_route_methods(name, route)
{:url => {:only_path => false}, :path => {:only_path => true}}.each do |kind, opts|
hash = route.defaults.merge(:use_route => name).merge(opts)
define_hash_access route, name, kind, hash
define_url_helper route, name, kind, hash
end
end
def define_hash_access(route, name, kind, options)
selector = hash_access_name(name, kind)
@module.send :module_eval, <<-end_eval # We use module_eval to avoid leaks
def #{selector}(options = nil)
options ? #{options.inspect}.merge(options) : #{options.inspect}
end
end_eval
@module.send(:protected, selector)
helpers << selector
end
def define_url_helper(route, name, kind, options)
selector = url_helper_name(name, kind)
# The segment keys used for positional paramters
segment_keys = route.segments.collect do |segment|
segment.key if segment.respond_to? :key
end.compact
hash_access_method = hash_access_name(name, kind)
@module.send :module_eval, <<-end_eval # We use module_eval to avoid leaks
def #{selector}(*args)
opts = if args.empty? || Hash === args.first
args.first || {}
else
# allow ordered parameters to be associated with corresponding
# dynamic segments, so you can do
#
# foo_url(bar, baz, bang)
#
# instead of
#
# foo_url(:bar => bar, :baz => baz, :bang => bang)
args.zip(#{segment_keys.inspect}).inject({}) do |h, (v, k)|
h[k] = v
h
end
end
url_for(#{hash_access_method}(opts))
end
end_eval
@module.send(:protected, selector)
helpers << selector
end
end
attr_accessor :routes, :named_routes
def initialize
self.routes = []
self.named_routes = NamedRouteCollection.new
end
# Subclasses and plugins may override this method to specify a different
# RouteBuilder instance, so that other route DSL's can be created.
def builder
@builder ||= RouteBuilder.new
end
def draw
clear!
yield Mapper.new(self)
named_routes.install
end
def clear!
routes.clear
named_routes.clear
@combined_regexp = nil
@routes_by_controller = nil
end
def empty?
routes.empty?
end
def load!
Routing.use_controllers! nil # Clear the controller cache so we may discover new ones
clear!
load_routes!
named_routes.install
end
alias reload load!
def load_routes!
if defined?(RAILS_ROOT) && defined?(::ActionController::Routing::Routes) && self == ::ActionController::Routing::Routes
load File.join("#{RAILS_ROOT}/config/routes.rb")
else
add_route ":controller/:action/:id"
end
end
def add_route(path, options = {})
route = builder.build(path, options)
routes << route
route
end
def add_named_route(name, path, options = {})
named_routes[name] = add_route(path, options)
end
def options_as_params(options)
# If an explicit :controller was given, always make :action explicit
# too, so that action expiry works as expected for things like
#
# generate({:controller => 'content'}, {:controller => 'content', :action => 'show'})
#
# (the above is from the unit tests). In the above case, because the
# controller was explicitly given, but no action, the action is implied to
# be "index", not the recalled action of "show".
#
# great fun, eh?
options_as_params = options[:controller] ? { :action => "index" } : {}
options.each do |k, value|
options_as_params[k] = value.to_param
end
options_as_params
end
def build_expiry(options, recall)
recall.inject({}) do |expiry, (key, recalled_value)|
expiry[key] = (options.key?(key) && options[key] != recalled_value)
expiry
end
end
# Generate the path indicated by the arguments, and return an array of
# the keys that were not used to generate it.
def extra_keys(options, recall={})
generate_extras(options, recall).last
end
def generate_extras(options, recall={})
generate(options, recall, :generate_extras)
end
def generate(options, recall = {}, method=:generate)
named_route_name = options.delete(:use_route)
if named_route_name
named_route = named_routes[named_route_name]
options = named_route.parameter_shell.merge(options)
end
options = options_as_params(options)
expire_on = build_expiry(options, recall)
# if the controller has changed, make sure it changes relative to the
# current controller module, if any. In other words, if we're currently
# on admin/get, and the new controller is 'set', the new controller
# should really be admin/set.
if !named_route && expire_on[:controller] && options[:controller] && options[:controller][0] != ?/
old_parts = recall[:controller].split('/')
new_parts = options[:controller].split('/')
parts = old_parts[0..-(new_parts.length + 1)] + new_parts
options[:controller] = parts.join('/')
end
# drop the leading '/' on the controller name
options[:controller] = options[:controller][1..-1] if options[:controller] && options[:controller][0] == ?/
merged = recall.merge(options)
if named_route
path = named_route.generate(options, merged, expire_on)
raise RoutingError, "#{named_route_name}_url failed to generate from #{options.inspect}, expected: #{named_route.requirements.inspect}, diff: #{named_route.requirements.diff(options).inspect}" if path.nil?
return path
else
merged[:action] ||= 'index'
options[:action] ||= 'index'
controller = merged[:controller]
action = merged[:action]
raise RoutingError, "Need controller and action!" unless controller && action
# don't use the recalled keys when determining which routes to check
routes = routes_by_controller[controller][action][options.keys.sort_by { |x| x.object_id }]
routes.each do |route|
results = route.send(method, options, merged, expire_on)
return results if results && (!results.is_a?(Array) || results.first)
end
end
raise RoutingError, "No route matches #{options.inspect}"
end
def recognize(request)
params = recognize_path(request.path, extract_request_environment(request))
request.path_parameters = params.with_indifferent_access
"#{params[:controller].camelize}Controller".constantize
end
def recognize_path(path, environment={})
path = CGI.unescape(path)
routes.each do |route|
result = route.recognize(path, environment) and return result
end
raise RoutingError, "no route found to match #{path.inspect} with #{environment.inspect}"
end
def routes_by_controller
@routes_by_controller ||= Hash.new do |controller_hash, controller|
controller_hash[controller] = Hash.new do |action_hash, action|
action_hash[action] = Hash.new do |key_hash, keys|
key_hash[keys] = routes_for_controller_and_action_and_keys(controller, action, keys)
end
end
end
end
def routes_for(options, merged, expire_on)
raise "Need controller and action!" unless controller && action
controller = merged[:controller]
merged = options if expire_on[:controller]
action = merged[:action] || 'index'
routes_by_controller[controller][action][merged.keys]
end
def routes_for_controller_and_action(controller, action)
selected = routes.select do |route|
route.matches_controller_and_action? controller, action
end
(selected.length == routes.length) ? routes : selected
end
def routes_for_controller_and_action_and_keys(controller, action, keys)
selected = routes.select do |route|
route.matches_controller_and_action? controller, action
end
selected.sort_by do |route|
(keys - route.significant_keys).length
end
end
# Subclasses and plugins may override this method to extract further attributes
# from the request, for use by route conditions and such.
def extract_request_environment(request)
{ :method => request.method }
end
end
Routes = RouteSet.new
end
end
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