vendor/rails/railties/lib/rails_generator/spec.rb

   1 module Rails
   2   module Generator
   3     # A spec knows where a generator was found and how to instantiate it.
   4     # Metadata include the generator's name, its base path, and the source
   5     # which yielded it (PathSource, GemPathSource, etc.)
   6     class Spec
   7       attr_reader :name, :path, :source
   8
   9       def initialize(name, path, source)
  10         @name, @path, @source = name, path, source
  11       end
  12
  13       # Look up the generator class.  Require its class file, find the class
  14       # in ObjectSpace, tag it with this spec, and return.
  15       def klass
  16         unless @klass
  17           require class_file
  18           @klass = lookup_class
  19           @klass.spec = self
  20         end
  21         @klass
  22       end
  23
  24       def class_file
  25         "#{path}/#{name}_generator.rb"
  26       end
  27
  28       def class_name
  29         "#{name.camelize}Generator"
  30       end
  31
  32       private
  33         # Search for the first Class descending from Rails::Generator::Base
  34         # whose name matches the requested class name.
  35         def lookup_class
  36           ObjectSpace.each_object(Class) do |obj|
  37             return obj if obj.ancestors.include?(Rails::Generator::Base) and
  38                           obj.name.split('::').last == class_name
  39           end
  40           raise NameError, "Missing #{class_name} class in #{class_file}"
  41         end
  42     end
  43   end
  44 end