module ActionDispatch module Journey # The Formatter class is used for formatting URLs. For example, parameters # passed to +url_for+ in rails will eventually call Formatter#generate. class Formatter # :nodoc: attr_reader :routes def initialize(routes) @routes = routes @cache = nil end def generate(type, name, options, recall = {}, parameterize = nil) constraints = recall.merge(options) missing_keys = [] match_route(name, constraints) do |route| parameterized_parts = extract_parameterized_parts(route, options, recall, parameterize) next if !name && route.requirements.empty? && route.parts.empty? missing_keys = missing_keys(route, parameterized_parts) next unless missing_keys.empty? params = options.dup.delete_if do |key, _| parameterized_parts.key?(key) || route.defaults.key?(key) end return [route.format(parameterized_parts), params] end raise Router::RoutingError.new "missing required keys: #{missing_keys}" end def clear @cache = nil end private def extract_parameterized_parts(route, options, recall, parameterize = nil) parameterized_parts = recall.merge(options) keys_to_keep = route.parts.reverse.drop_while { |part| !options.key?(part) || (options[part] || recall[part]).nil? } | route.required_parts (parameterized_parts.keys - keys_to_keep).each do |bad_key| parameterized_parts.delete(bad_key) end if parameterize parameterized_parts.each do |k, v| parameterized_parts[k] = parameterize.call(k, v) end end parameterized_parts.keep_if { |_, v| v } parameterized_parts end def named_routes routes.named_routes end def match_route(name, options) if named_routes.key?(name) yield named_routes[name] else routes = non_recursive(cache, options.to_a) hash = routes.group_by { |_, r| r.score(options) } hash.keys.sort.reverse_each do |score| next if score < 0 hash[score].sort_by { |i, _| i }.each do |_, route| yield route end end end end def non_recursive(cache, options) routes = [] stack = [cache] while stack.any? c = stack.shift routes.concat(c[:___routes]) if c.key?(:___routes) options.each do |pair| stack << c[pair] if c.key?(pair) end end routes end # Returns an array populated with missing keys if any are present. def missing_keys(route, parts) missing_keys = [] tests = route.path.requirements route.required_parts.each { |key| if tests.key?(key) missing_keys << key unless /\A#{tests[key]}\Z/ === parts[key] else missing_keys << key unless parts[key] end } missing_keys end def possibles(cache, options, depth = 0) cache.fetch(:___routes) { [] } + options.find_all { |pair| cache.key?(pair) }.map { |pair| possibles(cache[pair], options, depth + 1) }.flatten(1) end # Returns +true+ if no missing keys are present, otherwise +false+. def verify_required_parts!(route, parts) missing_keys(route, parts).empty? end def build_cache root = { ___routes: [] } routes.each_with_index do |route, i| leaf = route.required_defaults.inject(root) do |h, tuple| h[tuple] ||= {} end (leaf[:___routes] ||= []) << [i, route] end root end def cache @cache ||= build_cache end end end end