Split Data by other Data

Data+split.swift

import Foundation

let datas = "abc\r\n\r\n123\r\nあいう😂\r\nAB\r\n".data(using: .utf8)!

let delim = "\r\n".data(using: .utf8)!

extension Data {
    func split(separator: Data, omittingEmptySubsequences: Bool = true) -> [Data] {
      var current = startIndex
      var chunks = [Data]()

      while let range = self[current...].range(of: separator) {

          if !omittingEmptySubsequences {
              chunks.append(self[current..<range.lowerBound])
          } else if range.lowerBound > current {
              chunks.append(self[current..<range.lowerBound])
          }

          current = range.upperBound
      }
      if current < self.endIndex {
          chunks.append(self[current...])
      }
      return chunks
  }
}

let chunks = datas.split(separator: delim)
print("Count", chunks.count)
chunks.forEach {
  print(String(data: $0, encoding: .utf8)!)
}
/*
Count 4
abc
123
あいう😂
AB
*/


let chunks2 = datas.split(separator: delim, omittingEmptySubsequences: false)
print("Count", chunks2.count)
chunks2.forEach {
  print(String(data: $0, encoding: .utf8)!)
}

/*
Count 5
abc

123
あいう😂
AB
*/