module ActionController module Routing class Route #:nodoc: attr_accessor :segments, :requirements, :conditions, :optimise def initialize(segments = [], requirements = {}, conditions = {}) @segments = segments @requirements = requirements @conditions = conditions if !significant_keys.include?(:action) && !requirements[:action] @requirements[:action] = "index" @significant_keys << :action end # Routes cannot use the current string interpolation method # if there are user-supplied :requirements as the interpolation # code won't raise RoutingErrors when generating has_requirements = @segments.detect { |segment| segment.respond_to?(:regexp) && segment.regexp } if has_requirements || @requirements.keys.to_set != Routing::ALLOWED_REQUIREMENTS_FOR_OPTIMISATION @optimise = false else @optimise = true end end # Indicates whether the routes should be optimised with the string interpolation # version of the named routes methods. def optimise? @optimise && ActionController::Base::optimise_named_routes end def segment_keys segments.collect do |segment| segment.key if segment.respond_to? :key end.compact 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).each do |key| if value = hash[key] elements << value.to_query(key) end end elements.empty? ? '' : "?#{elements.sort * '&'}" 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) prepare_matching! (@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 # TODO: Route should be prepared and frozen on initialize def freeze unless frozen? write_generation! write_recognition! prepare_matching! parameter_shell significant_keys defaults to_s end super end private 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 # 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(options))\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(options)]\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.to_s}\\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 # 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 def prepare_matching! unless defined? @matching_prepared @controller_requirement = requirement_for(:controller) @action_requirement = requirement_for(:action) @matching_prepared = true end end end end end