# File lib/action_dispatch/middleware/stack.rb, line 76
def initialize(*args)
  @middlewares = []
  yield(self) if block_given?
end

# File lib/action_dispatch/middleware/stack.rb, line 93
def [](i)
  middlewares[i]
end

# File lib/action_dispatch/middleware/stack.rb, line 166
def build(app = nil, &block)
  instrumenting = ActiveSupport::Notifications.notifier.listening?(InstrumentationProxy::EVENT_NAME)
  middlewares.freeze.reverse.inject(app || block) do |a, e|
    if instrumenting
      e.build_instrumented(a)
    else
      e.build(a)
    end
  end
end

# File lib/action_dispatch/middleware/stack.rb, line 131
def delete(target)
  middlewares.reject! { |m| m.name == target.name }
end

# File lib/action_dispatch/middleware/stack.rb, line 139
def delete!(target)
  delete(target) || (raise "No such middleware to remove: #{target.inspect}")
end

# File lib/action_dispatch/middleware/stack.rb, line 81
def each(&block)
  @middlewares.each(&block)
end

# File lib/action_dispatch/middleware/stack.rb, line 102
def initialize_copy(other)
  self.middlewares = other.middlewares.dup
end

# File lib/action_dispatch/middleware/stack.rb, line 106
def insert(index, klass, *args, &block)
  index = assert_index(index, :before)
  middlewares.insert(index, build_middleware(klass, args, block))
end

# File lib/action_dispatch/middleware/stack.rb, line 114
def insert_after(index, *args, &block)
  index = assert_index(index, :after)
  insert(index + 1, *args, &block)
end

# File lib/action_dispatch/middleware/stack.rb, line 89
def last
  middlewares.last
end

# File lib/action_dispatch/middleware/stack.rb, line 143
def move(target, source)
  source_index = assert_index(source, :before)
  source_middleware = middlewares.delete_at(source_index)

  target_index = assert_index(target, :before)
  middlewares.insert(target_index, source_middleware)
end

# File lib/action_dispatch/middleware/stack.rb, line 153
def move_after(target, source)
  source_index = assert_index(source, :after)
  source_middleware = middlewares.delete_at(source_index)

  target_index = assert_index(target, :after)
  middlewares.insert(target_index + 1, source_middleware)
end

# File lib/action_dispatch/middleware/stack.rb, line 85
def size
  middlewares.size
end

# File lib/action_dispatch/middleware/stack.rb, line 120
def swap(target, *args, &block)
  index = assert_index(target, :before)
  insert(index, *args, &block)
  middlewares.delete_at(index + 1)
end

# File lib/action_dispatch/middleware/stack.rb, line 97
def unshift(klass, *args, &block)
  middlewares.unshift(build_middleware(klass, args, block))
end

# File lib/action_dispatch/middleware/stack.rb, line 161
def use(klass, *args, &block)
  middlewares.push(build_middleware(klass, args, block))
end

# File lib/action_dispatch/middleware/stack.rb, line 178
def assert_index(index, where)
  i = index.is_a?(Integer) ? index : index_of(index)
  raise "No such middleware to insert #{where}: #{index.inspect}" unless i
  i
end

# File lib/action_dispatch/middleware/stack.rb, line 184
def build_middleware(klass, args, block)
  Middleware.new(klass, args, block)
end

# File lib/action_dispatch/middleware/stack.rb, line 188
def index_of(klass)
  middlewares.index do |m|
    m.name == klass.name
  end
end