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Size: 1.33 KB
Versions: 9
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Stored size: 1.33 KB
Contents
# frozen_string_literal: true
# Released under the MIT License.
# Copyright, 2014-2022, by Samuel Williams.
module Utopia
class Controller
# Provides a stack-based instance variable lookup mechanism. It can flatten a stack of controllers into a single hash.
class Variables
def initialize
@controllers = []
end
def top
@controllers.last
end
def << controller
if top = self.top
# This ensures that most variables will be at the top and controllers can naturally interactive with instance variables:
controller.copy_instance_variables(top)
end
@controllers << controller
return self
end
# We use self as a seninel
def fetch(key, default=self)
if controller = self.top
if controller.instance_variables.include?(key)
return controller.instance_variable_get(key)
end
end
if block_given?
yield(key)
elsif !default.equal?(self)
return default
else
raise KeyError.new(key)
end
end
def to_hash
attributes = {}
if controller = self.top
controller.instance_variables.each do |name|
key = name[1..-1].to_sym
attributes[key] = controller.instance_variable_get(name)
end
end
return attributes
end
def [] key
fetch("@#{key}".to_sym, nil)
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems