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require "action_controller/metal/exceptions"
module ActionDispatch
# :stopdoc:
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
attr_reader :routes
def initialize(routes)
@routes = routes
@cache = nil
end
def generate(name, options, path_parameters, parameterize = nil)
constraints = path_parameters.merge(options)
missing_keys = nil # need for variable scope
match_route(name, constraints) do |route|
parameterized_parts = extract_parameterized_parts(route, options, path_parameters, parameterize)
# Skip this route unless a name has been provided or it is a
# standard Rails route since we can't determine whether an options
# hash passed to url_for matches a Rack application or a redirect.
next unless name || route.dispatcher?
missing_keys = missing_keys(route, parameterized_parts)
next if missing_keys && !missing_keys.empty?
params = options.dup.delete_if do |key, _|
parameterized_parts.key?(key) || route.defaults.key?(key)
end
defaults = route.defaults
required_parts = route.required_parts
route.parts.reverse_each do |key|
break if defaults[key].nil? && parameterized_parts[key].present?
next if parameterized_parts[key].to_s != defaults[key].to_s
break if required_parts.include?(key)
parameterized_parts.delete(key)
end
return [route.format(parameterized_parts), params]
end
unmatched_keys = (missing_keys || []) & constraints.keys
missing_keys = (missing_keys || []) - unmatched_keys
message = "No route matches #{Hash[constraints.sort_by { |k, v| k.to_s }].inspect}"
message << ", missing required keys: #{missing_keys.sort.inspect}" if missing_keys && !missing_keys.empty?
message << ", possible unmatched constraints: #{unmatched_keys.sort.inspect}" if unmatched_keys && !unmatched_keys.empty?
raise ActionController::UrlGenerationError, message
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_each.drop_while { |part|
!options.key?(part) || (options[part] || recall[part]).nil?
} | route.required_parts
parameterized_parts.delete_if do |bad_key, _|
!keys_to_keep.include?(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)
supplied_keys = options.each_with_object({}) do |(k, v), h|
h[k.to_s] = true if v
end
hash = routes.group_by { |_, r| r.score(supplied_keys) }
hash.keys.sort.reverse_each do |score|
break if score < 0
hash[score].sort_by { |i, _| i }.each do |_, route|
yield route
end
end
end
end
def non_recursive(cache, options)
routes = []
queue = [cache]
while queue.any?
c = queue.shift
routes.concat(c[:___routes]) if c.key?(:___routes)
options.each do |pair|
queue << c[pair] if c.key?(pair)
end
end
routes
end
module RegexCaseComparator
DEFAULT_INPUT = /[-_.a-zA-Z0-9]+\/[-_.a-zA-Z0-9]+/
DEFAULT_REGEX = /\A#{DEFAULT_INPUT}\Z/
def self.===(regex)
DEFAULT_INPUT == regex
end
end
# Returns an array populated with missing keys if any are present.
def missing_keys(route, parts)
missing_keys = nil
tests = route.path.requirements
route.required_parts.each { |key|
case tests[key]
when nil
unless parts[key]
missing_keys ||= []
missing_keys << key
end
when RegexCaseComparator
unless RegexCaseComparator::DEFAULT_REGEX === parts[key]
missing_keys ||= []
missing_keys << key
end
else
unless /\A#{tests[key]}\Z/ === parts[key]
missing_keys ||= []
missing_keys << key
end
end
}
missing_keys
end
def possibles(cache, options, depth = 0)
cache.fetch(:___routes) { [] } + options.find_all { |pair|
cache.key?(pair)
}.flat_map { |pair|
possibles(cache[pair], options, depth + 1)
}
end
def build_cache
root = { ___routes: [] }
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
# :startdoc:
end
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