Module: Sprout::Concern

Included in:
Base, Daemon, Executable, RubyFeature
Defined in:
lib/sprout/concern.rb

Overview

This class was copied from Rails source code and provides our RubyFeature with the ability to more clearly mix in functionality against a class and behave as if inheritance works at the class mixin level.

TODO: I'd like to update our system so that this functionality is no longer necessary - if you have ideas or opinions about this code, please let me know!

Class Method Summary (collapse)

Instance Method Summary (collapse)

Class Method Details

+ (Object) extended(base)

Callback handler when a class is extended. This handler will set the @_dependencies array on the concrete class that just extended a 'Concern'.

This callback is often triggered with:

class Foo
  extend Concern
end


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# File 'lib/sprout/concern.rb', line 26

def self.extended(base)
  base.instance_variable_set("@_dependencies", [])
end

Instance Method Details

- (Object) append_features(base)

Apply both class and instance features found in the base class to the new subclass.



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# File 'lib/sprout/concern.rb', line 33

def append_features(base)
  if base.instance_variable_defined?("@_dependencies")
    base.instance_variable_get("@_dependencies") << self
    return false
  else
    return false if base < self
    @_dependencies.each { |dep| base.send(:include, dep) }
    super
    base.extend const_get("ClassMethods") if const_defined?("ClassMethods")
    base.send :include, const_get("InstanceMethods") if const_defined?("InstanceMethods")
    base.class_eval(&@_included_block) if instance_variable_defined?("@_included_block")
  end
end

- (Object) included(base = nil, &block)

Handle inclusion of this module.



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# File 'lib/sprout/concern.rb', line 49

def included(base = nil, &block)
  if base.nil?
    @_included_block = block
  else
    super
  end
end