class Plugins

# File lib/plugins.rb, line 12
def initialize(component=nil, &block)
  @component = component
  @plugin_loader = block
end

# File lib/plugins.rb, line 17
def add(plugin=nil, *args, &block)
  plugin = _load(plugin, &block)
  _add_plugin(plugin.new(self, *args))
end

# File lib/plugins.rb, line 31
def after(subject, *args)
  _plugins.reverse_each { |plugin| plugin.after(subject, *args) }
end

# File lib/plugins.rb, line 35
def around(subject, *args, &block)
  _around_stack.call(subject, *args) { |subject, *args| block.call(*args) }
end

# File lib/plugins.rb, line 27
def before(subject, *args)
  _plugins.reverse_each { |plugin| plugin.before(subject, *args) }
end

# File lib/plugins.rb, line 22
def clear
  @_plugins = nil
  @_around_stack = nil
end

# File lib/plugins.rb, line 39
def perform(subject, *args, &block)
  before(subject, *args)
  retval = around(subject, *args, &block)
  after(subject, *args)

  retval
end

# File lib/plugins.rb, line 56
def _add_plugin(plugin)
  _plugins.push(plugin)

  _around_stack.push { |subject, *args|
    plugin.around(subject, *args) { |*args|
      perform_block(subject, *args)
    }
  }

  plugin
end

# File lib/plugins.rb, line 52
def _around_stack
  @_around_stack ||= AroundStack.new(:block, self)
end

# File lib/plugins.rb, line 92
def _call_plugin_loader(plugin)
  plugin_loader && component.instance_exec(plugin, &plugin_loader)
end

# File lib/plugins.rb, line 68
def _load(plugin, &block)
  if plugin
    _load_plugin(plugin)
  elsif block_given?
    Plugin.create(&block)
  else
    raise Errors::LoadError, 'No plugin information provided'
  end
end

# File lib/plugins.rb, line 78
def _load_plugin(plugin)
  _call_plugin_loader(plugin).tap { |p| plugin = p if p }

  case plugin
  when Class
    plugin < Plugin && plugin or
      raise Errors::LoadError, "Invalid plugin class: #{plugin.inspect} Must extend Plugin."
  when Proc
    Plugin.create(&plugin)
  else
    raise Errors::LoadError, "Invalid plugin identifier: #{plugin.inspect}"
  end
end

# File lib/plugins.rb, line 48
def _plugins
  @_plugins ||= []
end