ruby - 再帰、混合配列、Ruby

Question

期待どおりに返されない再帰的な問題があり、関数を変更する方法がわかりません。

テキストで定義された境界で区切られたテキストのチャンクから派生した文字列と配列の両方を含む配列が必要です。最初のパスは機能しますが、2 番目のパスでは、boundary キーワードを含む文字列が正しく配列に変換されず、親配列内で置換されないようです。

再帰関数:

def separate(text,boundary = nil)
    # returns array of strings and arrays containing all of the parts of the email
    textList = []
    if !boundary #look in the email for "boundary= X"
        text.scan(/(?<=boundary=).*/) do |bound|
            textList = recursiveSplit(text,bound)
            end
    end
    if boundary 
        textList = recursiveSplit(text,boundary)
    end
    puts textList.count
    puts '\n'
    puts textList.inspect
    return textList
end


def recursiveSplit(chunk,boundary)
    if chunk.is_a? String
        searchString = "--" + boundary
        ar = chunk.split(searchString)
        return ar
    elsif chunk.is_a? Array
        chunk do |bit|
            recursiveSplit(bit,boundary);
        end
    end
end

テキスト変数の例:

MIME-Version: 1.0
Received: by 10.112.170.40 with HTTP; Fri, 3 May 2013 05:08:21 -0700 (PDT)
Date: Fri, 3 May 2013 08:08:21 -0400
Delivered-To: me@gmail.com
Message-ID: <CADPp44E47syuXvP1K-aemhcU7vdSijZkfKLu-74QPWs9U9551Q@mail.gmail.com>
Subject: MiB 5/3/13 7:43AM (EST)
From: Me <me@gmail.com>
To: Someone <someone@aol.com>
Content-Type: multipart/mixed; boundary=BNDRY1

--BNDRY1
Content-Type: multipart/alternative; boundary=BNDRY2

--BNDRY2
Content-Type: text/plain; charset=ISO-8859-1

-TEXT STUFF HERE. SAYING THINGS
ABOUT CERTAIN THINGS

--BNDRY2
Content-Type: text/html; charset=ISO-8859-1

HTML FORMATTED TEXT STUFF

--BNDRY2--
--BNDRY1
Content-Type: application/zip; name="Make it Brief.ipa.zip"
Content-Disposition: attachment; filename="Make it Brief.ipa.zip"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_hg9biuno0

<<FILE DATA>>
--BNDRY1--