Class: Utopia::Controller

Inherits:
Object
  • Object
show all
Defined in:
lib/utopia/controller/base.rb,
lib/utopia/controller/action.rb,
lib/utopia/controller/variables.rb,
lib/utopia/controller.rb

Defined Under Namespace

Classes: Action, Base, Variables

Constant Summary collapse

CONTROLLER_RB = 
"controller.rb".freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app, options = {}) ⇒ Controller

Returns a new instance of Controller.



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# File 'lib/utopia/controller.rb', line 41

def initialize(app, options = {})
	@app = app
	@root = options[:root] || Utopia::default_root

	@controllers = {}
	
	@cache_controllers = options[:cache_controllers] || false
end

Instance Attribute Details

#app ⇒ Object (readonly)

Returns the value of attribute app.



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# File 'lib/utopia/controller.rb', line 50

def app
  @app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/utopia/controller.rb', line 125

def call(env)
	variables = (env["utopia.controller"] ||= Variables.new)
	
	request = Rack::Request.new(env)
	
	if result = invoke_controllers(variables, request)
		return result
	end
	
	return @app.call(env)
end

#invoke_controllers(variables, request, done = Set.new) ⇒ Object 



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# File 'lib/utopia/controller.rb', line 92

def invoke_controllers(variables, request, done = Set.new)
	path = Path.create(request.path_info)
	controller_path = Path.new
	
	path.descend do |controller_path|
		# puts "Invoke controller: #{controller_path}"
		if controller = lookup_controller(controller_path)
			# We only want to invoke controllers which have not already been invoked:
			unless done.include? controller
				# If we get throw :rewrite, location, the URL has been rewritten and we need to request again:
				location = catch(:rewrite) do
					# Invoke the controller and if it returns a result, send it back out:
					if result = controller.process!(request, path)
						return result
					end
				end
				
				if location
					# Rewrite relative paths based on the controller's URI:
					request.env['PATH_INFO'] = Path[location].expand(controller.class.uri_path).to_s
					
					return invoke_controllers(variables, request, done)
				end
				
				done << controller
			end
		end
	end
	
	# No controller gave a useful result:
	return nil
end

#load_controller_file(path) ⇒ Object 



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# File 'lib/utopia/controller.rb', line 62

def load_controller_file(path)
	uri_path = path
	base_path = File.join(@root, uri_path.components)
	
	controller_path = File.join(base_path, CONTROLLER_RB)
	# puts "load_controller_file(#{path.inspect}) => #{controller_path}"
	
	if File.exist?(controller_path)
		klass = Class.new(Base)
		
		# base_path is expected to be a string representing a filesystem path:
		klass.const_set(:BASE_PATH, base_path)
		
		# uri_path is expected to be an instance of Path:
		klass.const_set(:URI_PATH, uri_path)
		
		klass.const_set(:CONTROLLER, self)
		
		$LOAD_PATH.unshift(base_path)
		
		klass.class_eval(File.read(controller_path), controller_path)
		
		$LOAD_PATH.delete(base_path)
		
		return klass.new
	else
		return nil
	end
end

#lookup_controller(path) ⇒ Object 



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# File 'lib/utopia/controller.rb', line 52

def lookup_controller(path)
	if @cache_controllers
		return @controllers.fetch(path.to_s) do |key|
			@controllers[key] = load_controller_file(path)
		end
	else
		return load_controller_file(path)
	end
end