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ある文字列を特定のEncodingで指定バイト数に収まる長さで切り出す

Ruby

Last updated at 2013-10-07Posted at 2013-10-07

こんな感じ？
もっと楽な方法ないかな？

truncate_with_encoding.rb

  def truncate_with_encoding(string, target_encoding, max_byte)
    original_encoding = string.encoding

    encoded_string = string.encode(target_encoding)
    result = ""
    encoded_string.each_char {|c|
      total_bytes = result.bytesize + c.bytesize
      result << c if total_bytes <= max_byte
    }

    result.encode(original_encoding)
  end

実行結果

truncate_with_encoding("abcあいう", Encoding::SJIS, 6)
# => "abcあ"

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