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

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module Rails

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  module Generator

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    # A spec knows where a generator was found and how to instantiate it.

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    # Metadata include the generator's name, its base path, and the source

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    # which yielded it (PathSource, GemPathSource, etc.)

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    class Spec

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      attr_reader :name, :path, :source

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      def initialize(name, path, source)

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        @name, @path, @source = name, path, source

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      end

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      # Look up the generator class.  Require its class file, find the class

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      # in ObjectSpace, tag it with this spec, and return.

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      def klass

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        unless @klass

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          require class_file

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          @klass = lookup_class

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          @klass.spec = self

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        end

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        @klass

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      end

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      def class_file

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        "#{path}/#{name}_generator.rb"

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      end

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      def class_name

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        "#{name.camelize}Generator"

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      end

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      private

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        # Search for the first Class descending from Rails::Generator::Base

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        # whose name matches the requested class name.

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        def lookup_class

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          ObjectSpace.each_object(Class) do |obj|

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            return obj if obj.ancestors.include?(Rails::Generator::Base) and

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                          obj.name.split('::').last == class_name

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          end

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          raise NameError, "Missing #{class_name} class in #{class_file}"

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        end

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    end

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  end

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end

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