Class: Rage::Router::Backend

Inherits:
Object
  • Object
show all
Defined in:
lib/rage/router/backend.rb

Constant Summary collapse

OPTIONAL_PARAM_REGEXP = 
/\/?\(\/?(:\w+)\/?\)/
STRING_HANDLER_REGEXP = 
/^([a-z0-9_\/]+)#([a-z_]+)$/

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Backend

Returns a new instance of Backend.



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# File 'lib/rage/router/backend.rb', line 9

def initialize
  @routes = []
  @trees = {}
  @constrainer = Rage::Router::Constrainer.new({})
end

Instance Method Details

#lookup(env) ⇒ Object 



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# File 'lib/rage/router/backend.rb', line 48

def lookup(env)
  constraints = @constrainer.derive_constraints(env)
  find(env, constraints)
end

#on(method, path, handler, constraints: {}) ⇒ Object 



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# File 'lib/rage/router/backend.rb', line 15

def on(method, path, handler, constraints: {})
  raise "Path could not be empty" if path&.empty?

  if match_index = (path =~ OPTIONAL_PARAM_REGEXP)
    raise "Optional Parameter has to be the last parameter of the path" if path.length != match_index + $&.length

    path_full = path.sub(OPTIONAL_PARAM_REGEXP, "/#{$1}")
    path_optional = path.sub(OPTIONAL_PARAM_REGEXP, "")

    on(method, path_full, handler, constraints: constraints)
    on(method, path_optional, handler, constraints: constraints)
    return
  end

  if handler.is_a?(String)
    raise "Invalid route handler format, expected to match the 'controller#action' pattern" unless handler =~ STRING_HANDLER_REGEXP

    controller, action = to_controller_class($1), $2
    run_action_method_name = controller.__register_action(action.to_sym)

    handler = eval("->(env, params) { #{controller}.new(env, params).#{run_action_method_name} }")
  else
    raise "Non-string route handler should respond to `call`" unless handler.respond_to?(:call)
    # while regular handlers are expected to be called with the `env` and `params` objects,
    # lambda handlers expect just `env` as an argument;
    # TODO: come up with something nicer?
    orig_handler = handler
    handler = ->(env, _params) { orig_handler.call(env) }
  end

  __on(method, path, handler, constraints)
end