226 lines
8.1 KiB
Ruby
226 lines
8.1 KiB
Ruby
require 'erubis'
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require 'set'
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require 'active_support/configurable'
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require 'active_support/descendants_tracker'
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require 'active_support/core_ext/module/anonymous'
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module AbstractController
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class Error < StandardError #:nodoc:
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end
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class ActionNotFound < StandardError #:nodoc:
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end
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# <tt>AbstractController::Base</tt> is a low-level API. Nobody should be
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# using it directly, and subclasses (like ActionController::Base) are
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# expected to provide their own +render+ method, since rendering means
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# different things depending on the context.
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class Base
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attr_internal :response_body
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attr_internal :action_name
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attr_internal :formats
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include ActiveSupport::Configurable
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extend ActiveSupport::DescendantsTracker
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undef_method :not_implemented
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class << self
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attr_reader :abstract
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alias_method :abstract?, :abstract
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# Define a controller as abstract. See internal_methods for more
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# details.
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def abstract!
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@abstract = true
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end
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# A list of all internal methods for a controller. This finds the first
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# abstract superclass of a controller, and gets a list of all public
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# instance methods on that abstract class. Public instance methods of
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# a controller would normally be considered action methods, so methods
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# declared on abstract classes are being removed.
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# (ActionController::Metal and ActionController::Base are defined as abstract)
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def internal_methods
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controller = self
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controller = controller.superclass until controller.abstract?
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controller.public_instance_methods(true)
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end
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# The list of hidden actions. Defaults to an empty array.
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# This can be modified by other modules or subclasses
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# to specify particular actions as hidden.
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#
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# ==== Returns
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# * <tt>Array</tt> - An array of method names that should not be considered actions.
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def hidden_actions
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[]
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end
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# A list of method names that should be considered actions. This
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# includes all public instance methods on a controller, less
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# any internal methods (see #internal_methods), adding back in
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# any methods that are internal, but still exist on the class
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# itself. Finally, #hidden_actions are removed.
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#
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# ==== Returns
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# * <tt>Set</tt> - A set of all methods that should be considered actions.
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def action_methods
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@action_methods ||= begin
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# All public instance methods of this class, including ancestors
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methods = (public_instance_methods(true) -
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# Except for public instance methods of Base and its ancestors
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internal_methods +
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# Be sure to include shadowed public instance methods of this class
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public_instance_methods(false)).uniq.map { |x| x.to_s } -
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# And always exclude explicitly hidden actions
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hidden_actions.to_a
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# Clear out AS callback method pollution
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Set.new(methods.reject { |method| method =~ /_one_time_conditions/ })
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end
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end
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# action_methods are cached and there is sometimes need to refresh
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# them. clear_action_methods! allows you to do that, so next time
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# you run action_methods, they will be recalculated
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def clear_action_methods!
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@action_methods = nil
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end
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# Returns the full controller name, underscored, without the ending Controller.
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# For instance, MyApp::MyPostsController would return "my_app/my_posts" for
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# controller_path.
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#
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# ==== Returns
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# * <tt>String</tt>
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def controller_path
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@controller_path ||= name.sub(/Controller$/, '').underscore unless anonymous?
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end
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# Refresh the cached action_methods when a new action_method is added.
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def method_added(name)
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super
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clear_action_methods!
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end
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end
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abstract!
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# Calls the action going through the entire action dispatch stack.
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#
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# The actual method that is called is determined by calling
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# #method_for_action. If no method can handle the action, then an
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# ActionNotFound error is raised.
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#
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# ==== Returns
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# * <tt>self</tt>
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def process(action, *args)
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@_action_name = action_name = action.to_s
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unless action_name = method_for_action(action_name)
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raise ActionNotFound, "The action '#{action}' could not be found for #{self.class.name}"
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end
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@_response_body = nil
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process_action(action_name, *args)
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end
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# Delegates to the class' #controller_path
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def controller_path
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self.class.controller_path
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end
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# Delegates to the class' #action_methods
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def action_methods
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self.class.action_methods
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end
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# Returns true if a method for the action is available and
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# can be dispatched, false otherwise.
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#
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# Notice that <tt>action_methods.include?("foo")</tt> may return
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# false and <tt>available_action?("foo")</tt> returns true because
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# this method considers actions that are also available
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# through other means, for example, implicit render ones.
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#
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# ==== Parameters
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# * <tt>action_name</tt> - The name of an action to be tested
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#
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# ==== Returns
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# * <tt>TrueClass</tt>, <tt>FalseClass</tt>
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def available_action?(action_name)
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method_for_action(action_name).present?
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end
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private
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# Returns true if the name can be considered an action because
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# it has a method defined in the controller.
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#
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# ==== Parameters
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# * <tt>name</tt> - The name of an action to be tested
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#
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# ==== Returns
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# * <tt>TrueClass</tt>, <tt>FalseClass</tt>
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#
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# :api: private
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def action_method?(name)
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self.class.action_methods.include?(name)
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end
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# Call the action. Override this in a subclass to modify the
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# behavior around processing an action. This, and not #process,
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# is the intended way to override action dispatching.
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#
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# Notice that the first argument is the method to be dispatched
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# which is *not* necessarily the same as the action name.
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def process_action(method_name, *args)
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send_action(method_name, *args)
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end
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# Actually call the method associated with the action. Override
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# this method if you wish to change how action methods are called,
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# not to add additional behavior around it. For example, you would
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# override #send_action if you want to inject arguments into the
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# method.
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alias send_action send
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# If the action name was not found, but a method called "action_missing"
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# was found, #method_for_action will return "_handle_action_missing".
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# This method calls #action_missing with the current action name.
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def _handle_action_missing(*args)
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action_missing(@_action_name, *args)
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end
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# Takes an action name and returns the name of the method that will
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# handle the action. In normal cases, this method returns the same
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# name as it receives. By default, if #method_for_action receives
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# a name that is not an action, it will look for an #action_missing
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# method and return "_handle_action_missing" if one is found.
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#
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# Subclasses may override this method to add additional conditions
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# that should be considered an action. For instance, an HTTP controller
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# with a template matching the action name is considered to exist.
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#
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# If you override this method to handle additional cases, you may
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# also provide a method (like _handle_method_missing) to handle
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# the case.
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#
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# If none of these conditions are true, and method_for_action
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# returns nil, an ActionNotFound exception will be raised.
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#
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# ==== Parameters
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# * <tt>action_name</tt> - An action name to find a method name for
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#
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# ==== Returns
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# * <tt>string</tt> - The name of the method that handles the action
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# * <tt>nil</tt> - No method name could be found. Raise ActionNotFound.
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def method_for_action(action_name)
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if action_method?(action_name) then action_name
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elsif respond_to?(:action_missing, true) then "_handle_action_missing"
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end
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end
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end
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end
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