Module: ModuleShims::Switch

Defined in:
lib/module_shims/switch.rb

Instance Method Summary collapse

Instance Method Details

#default_target ⇒ Object 



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# File 'lib/module_shims/switch.rb', line 44

def default_target
  const_get(name.gsub(/\A[^:]*/, ''))
end

#disable_shim ⇒ Object 



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# File 'lib/module_shims/switch.rb', line 9

def disable_shim
  target_const.prefix_existing_instance_methods('__module_switch', self, true)
  target_const.remove_instance_methods_from_ancestors("#{name}::SHIM")
end

#enable_shim(shadow_target = true) ⇒ Object 



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# File 'lib/module_shims/switch.rb', line 3

def enable_shim(shadow_target = true)
  insert_shim unless @inserted
  target_const.prefix_existing_instance_methods('__module_switch', self) if shadow_target
  shim_const.copy_existing_instance_methods(self)
end

#insert_shim ⇒ Object 



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# File 'lib/module_shims/switch.rb', line 14

def insert_shim
  @inserted ||=
    begin
      target_const.send(:prepend, shim_const)
      true
    end
end

#shim_const ⇒ Object 



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# File 'lib/module_shims/switch.rb', line 22

def shim_const
  return const_get('SHIM') if const_defined?('SHIM')

  # use predefined_method to look up SHIM module. It's to support "reload!" in rails console
  predefined_method = "#{self.name.downcase.gsub(/::/, '_')}_shim"
  existing_shim = target_const.ancestors.find { |anc| anc.respond_to? predefined_method }

  unless existing_shim
    existing_shim = Module.new
    existing_shim.singleton_class.send(:define_method, predefined_method) {}
  end
  const_set('SHIM', existing_shim)
end

#target_const ⇒ Object 



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# File 'lib/module_shims/switch.rb', line 36

def target_const
  @target ||= default_target
end

#target_const=(target = default_target) ⇒ Object 



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# File 'lib/module_shims/switch.rb', line 40

def target_const=(target = default_target)
  @target = target
end